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Sample records for impacts involving porous

  1. Numerical simulations of impacts involving porous bodies. II. Comparison with laboratory experiments

    NASA Astrophysics Data System (ADS)

    Jutzi, Martin; Michel, Patrick; Hiraoka, Kensuke; Nakamura, Akiko M.; Benz, Willy

    2009-06-01

    In this paper, we compare the outcome of high-velocity impact experiments on porous targets, composed of pumice, with the results of simulations by a 3D SPH hydrocode in which a porosity model has been implemented. The different populations of small bodies of our Solar System are believed to be composed, at least partially, of objects with a high degree of porosity. To describe the fragmentation of such porous objects, a different model is needed than that used for non-porous bodies. In the case of porous bodies, the impact process is not only driven by the presence of cracks which propagate when a stress threshold is reached, it is also influenced by the crushing of pores and compaction. Such processes can greatly affect the whole body's response to an impact. Therefore, another physical model is necessary to improve our understanding of the collisional process involving porous bodies. Such a model has been developed recently and introduced successfully in a 3D SPH hydrocode [Jutzi, M., Benz, W., Michel, P., 2008. Icarus 198, 242-255]. Basic tests have been performed which already showed that it is implemented in a consistent way and that theoretical solutions are well reproduced. However, its full validation requires that it is also capable of reproducing the results of real laboratory impact experiments. Here we present simulations of laboratory experiments on pumice targets for which several of the main material properties have been measured. We show that using the measured material properties and keeping the remaining free parameters fixed, our numerical model is able to reproduce the outcome of these experiments carried out under different impact conditions. This first complete validation of our model, which will be tested for other porous materials in the future, allows us to start addressing problems at larger scale related to small bodies of our Solar System, such as collisions in the Kuiper Belt or the formation of a family by the disruption of a porous

  2. Crosslinking of porous SiOCH films involving Si-O-C bonds: Impact of deposition and curing

    NASA Astrophysics Data System (ADS)

    Gourhant, O.; Gerbaud, G.; Zenasni, A.; Favennec, L.; Gonon, P.; Jousseaume, V.

    2010-12-01

    This paper focuses on the properties of nanoporous SiOCH thin films deposited using a porogen approach by plasma enhanced chemical vapor deposition. The impact of deposition temperature, porogen loading and porogen removal treatment is investigated using Fourier transform infrared spectroscopy, solid-state nuclear magnetic resonance analysis, and electrical and mechanical measurements. This work shows that a higher deposition temperature allows limiting the film shrinkage during the porogen removal treatment and leads to the best compromise in term of electrical and mechanical properties. Beside, the effect of Si-O-C bonds on the enhancement of mechanical properties is promoted since a typical crosslinking mechanism is highlighted in case of ultraviolet curing.

  3. Droplet impact on a porous substrate: a capillary tube model

    NASA Astrophysics Data System (ADS)

    Ding, Hang; Theofanous, Theo

    2009-11-01

    The dynamics of impacting (spreading, penetrating) a droplet on a porous substrate, modeled by an array of capillary tubes, is studied numerically using diffuse interface methods. The absorption rate depends on the diameter ratio of the capillary tube to the droplet, wettability, and liquid properties. The flow dynamics is resolved by solving the Navier-Stokes equations and interface capturing is governed by the Cahn-Hilliard equation. Contact-angle hysteresis is included (Ding&Spelt 2008) and the stress singularity at moving contact lines is relieved using a diffuse interface model (Seppecher 1996; Jaqcmin 2000). The model is validated by studying the evolution of a droplet initially resting on a porous substrate and by comparison to drop-impact experiments involving just one capillary tube (Kogan et al 2008). Comparisons with analytical solutions and results available in the literature (e.g. Hilpert & Ben-David 2009) are presented. Through parametric simulations over relevant ranges of Reynolds and Ohnesorge numbers and contact angles, impact regime maps are derived.

  4. Impact cratering and ejection of material on porous asteroids

    NASA Astrophysics Data System (ADS)

    Housen, K.; Sweet, W.

    2014-07-01

    The manner in which an impact crater and its ejecta blanket are created involves an interplay between gravity and the strength properties of the target material. Gravity is important because the overburden stress at depth in an asteroid determines the material shear strength, which affects the mechanics of crater and ejecta formation. This has important implications when attempting to use lab experiments to simulate large-crater formation on asteroids. The only way to perform small-scale experimental simulations of cratering events on asteroids is to adjust the ambient ''gravity'', g, such that the experiment has the same product of gL as the actual impact event being simulated, where L is an important length scale, such as the projectile or crater size [1]. In this way, the lab crater has the same overburden stress (and shear strength) and ejecta ballistics as a much larger cratering event on an asteroid. Even though asteroids have weak gravity fields, the overburden stress of a multiple-km crater is larger than can be reproduced in the lab at 1 G. Therefore, simulation of large impacts on asteroids requires that the ''gravity'' of the experiment is greater than 1 G. Here we report on a series of impact experiments conducted at elevated gravity on a geotechnical centrifuge. These experimental craters are subscale replicas of the much larger craters they simulate; larger G-levels simulate larger craters. Using the Boeing 600-G centrifuge, we directly simulate the formation of asteroid (g˜0.001 G) craters as large as several tens of km. The target materials are cohesionless with porosity ranging from 35 % to 95 %. Cratering experiments in soils with small or moderate porosity (<30 %) show a decrease in cratering efficiency (crater volume/impactor volume) with increasing size scale or, equivalently, increasing G in a centrifuge experiment. This well-known gravity-regime behavior is due to the fact that the shear strength of the target material goes up due to the

  5. Impact ionization experiments with porous cosmic dust particle analogs

    NASA Astrophysics Data System (ADS)

    Sterken, Veerle; Moragas-Klostermeyer, Georg; Hillier, Jon; Fielding, Lee; Lovett, Joseph; Armes, Steven; Fechler, Nina; Srama, Ralf; Bugiel, Sebastian; Hornung, Klaus

    2016-04-01

    Impact ionization experiments have been performed since more than 40 years for calibration of cosmic dust instruments using a linear Van de Graaff dust accelerator. Such an accelerator can accelerate conductive dust particles of sizes between ca. a few tens of microns, and a micron in size to speeds up to 80 km/s depending on particle size. Many different materials have been used for instrument calibration, from iron in the earlier days to carbon, metal-coated minerals and most recently, minerals coated with conductive polymers. While different materials with different densities have been used for instrument calibration, no comparative analysis has been made yet of compact particles versus porous or fluffy particles of the same material. Porous or fluffy particles are increasingly found to be present in the solar system, e.g. dust from comet 67P Churyumov-Gerasimenko or aggregate grains from the plumes of Enceladus and recently also indications were found for low-density interstellar dust (ISD) from ISD data and trajectory simulations. These recalibrations are thus relevant for estimations of the size distributions of interplanetary and interstellar dust. In this talk we report about the calibrations being performed at the Heidelberg dust accelerator facility for investigating the influence of particle density on the impact ionization charge after impact. We use the Cassini Cosmic Dust Analyser as an impact target. We then explain the experiment set-up, the preparation of the materials and the materials used. We elaborate on the technical challenges, and finally about the current status of the research at this stage. We conclude the talk with the relevance of the study, being the potential influence of such calibrations on the estimates of the mass distributions of interstellar and interplanetary dust.

  6. Impact cratering and catastrophic disruption of porous targets through hypervelocity impact experiments

    NASA Astrophysics Data System (ADS)

    Ferri, F.; Giacomuzzo, C.; Pavarin, D.; Francesconi, A.; Bettella, A.; Flamini, E.; Angrilli, F.

    We present an experimental study of impact cratering and fragmentation processes onto low density materials by means of high velocity impact experiments using a two-stage light-gas gun, the impact facility of CISAS "G. Colombo" of the University of Padova (http://cisas.unipd.it/lgg/lgg.html). The goal of our experiments is to obtain a better comprehension of the impact processes on different materials in order to analyze the evolution of the surface of the solid bodies and the collisional evolution of the minor bodies of the Solar System. The results of this research are also aimed to contribute to the data interpretation of the ground- and space-based observations, in particular in view of space missions such as Smart1, MarsExpress, VenusExpress, BepiColombo, Cassini-Huygens, Rosetta, Dawn. Porosity is an important physical characteristic of the minor bodies, affecting their behaviour during cratering and greatly lengthening the collisional lifetimes of porous asteroids. Porous targets are likely to have average sound velocity lower than those of nonporous targets composed of same material; compaction of initially porous materials can produce rapid attenuation of the shock, thus affecting energy propagation during collisions. Therefore we focus on the study of impact processes on porous targets both by experimental and theoretical approach in order to complement and extend the available data to ranges of velocity and physical conditions not yet explored. In order to simulate porous asteroids, comets, icy satellites, we have manufactured and used targets of different material, e.g. glass ceramic foam, natural pumices, water ice, and different porosity (with density ranging from 0.35 to 1.07 g/cm3 ). Impact test campaign have been performed on the different samples varying the impact kinetic energy (by changing projectile mass and velocity) in order to study the craterization up to catastrophic disruption. The impact and shattering events are observed by high speed

  7. Experimental study on impact disruption of porous asteroids: Effects of oblique impact and multiple collisions on impact strength

    NASA Astrophysics Data System (ADS)

    Yasui, Minami; Takano, Shota; Matsue, Kazuma; Arakawa, Masahiko

    2015-08-01

    Most of asteroids would have pores and a plenty of pre-cracks in their interiors, and the pre-cracks could be formed by multiple impacts at various impact angles. Porosity and pre-cracks are important physical properties controlling the impact strength. Okamoto and Arakawa (2009) did impact experiments of porous gypsum spheres to obtain the impact strength of porous asteroids, but they carried out only single impact experiments on the same target at head-on. In this study, we conducted oblique impact and multiple impacts on porous gypsum and examined the effects of impact angle and pre-cracks on the impact strength.We carried out impact experiments by using the one-stage He gas gun and the two-stage H2 gas gun at Kobe University. The impact velocities were <200 m/s (low-vi) and >3 km/s (high-vi). Targets were porous gypsum spheres with the porosity of 55% and the diameters of 7 or 12 cm. The projectiles were a porous gypsum sphere with the diameter of 2.5 cm at low-vi or a polycarbonate sphere with the diameter of 4.7 cm at high-vi. The impact angle changed from 15° to 90°, and the projectile was impacted on the same target for 2-15 times. The impact phenomena were observed by a high-speed digital video camera to measure the fragment velocities.The oblique impact experiments showed that the impact strength did not depend on the impact angle θ between 45° and 90°, and obtained to be ~2000 J/kg, while it drastically changed at the θ from 15° to 30°. We reanalyzed our results by using the effective energy density defined as Qsin2θ, where Q is the energy density, and found that most of the results were consistent with the results of head-on impacts. The multiple impacts showed that the impact strength of pre-impacted targets was larger than that of intact targets in the case of low-vi. This might be caused by the compaction of the target surface. In the case of high-vi, the impact strength of pre-impacted targets was smaller than that of intact targets. This

  8. [The impact of socially involved films].

    PubMed

    Mimoun, M

    1979-01-01

    During the past few years studies on linguistics and particularly on semiology have considerably renewed the approach and investigation methods in artistic expression. Ideology has several languages and expression systems (photography, painting, music, speech, architecture and so on). The film does not only carry an ideological content: besides the signification systems and the signs taken from other means of films. To consider only films which have the ostensible objective to urge the public to a political action as socially involved is wrong: any movie is socially involved. One must appreciate correctly and politically the place, role and level at which it intervenes in the framework of the ideological fight. Audiovisual alphabetization is essential for the progress of new ideas in the field of picture and sound. In the Third World, when they do exist, cinematographies rarely have the political power to consider such an action. Ideological impact depends mostly on the social, political and cultural environment. A movie is 1st questioned from the standpoint of the historical place and of the problems of the public. The example of Algerian cinematography as a socially involved one is given. At its origin, film-making in this country was working at informing the outside world of the meaning of the people's fight. Its goal was to capture the political and social reality in order to change it. Therefore the social involvement role of Algerian film-producing is tightly connected to the revolutionary process in which the whole country is engaged. Algerian film-producing is often understood as a propaganda cinematography. The stagnation or progress of a cinematography cannot be measured in relation to the universal mythical culture, but in relation to the social and cultural reality of the country where it originates. The present deepening of the reflection on film and ideology is a result of a recent accentuation of the ideologic fight. PMID:12261392

  9. Impact of saturation on dispersion and mixing in porous media

    NASA Astrophysics Data System (ADS)

    Jimenez-Martinez, J.; De Anna, P.; Turuban, R.; Tabuteau, H.; Le Borgne, T.; Meheust, Y.

    2014-12-01

    In partially saturated porous media, the spatial distribution of wetting (e.g., water) and non-wetting (e.g., air) phases causes the liquid flow to be focused onto narrow and complex flow paths, leaving large volumes of wetting fluid trapped in between non-wetting phase clusters. The impact of the resulting highly heterogeneous wetting fluid velocity distributions on the dispersion and mixing of a solute in this wetting phase is critical for predicting reactive transport processes that take place in partially saturated porous media. We study the dependence of dispersion and mixing on the saturation degree using a 2D experimental setup consisting of cylindrical grains built using soft lithography. The joint injection of the two phases (wetting and non-wetting) provides a controlled homogeneous saturation in the medium. The simultaneous measurement of the flow velocity field, the spatial distribution of the wetting and non-wetting phases, and the tracer concentration field are used to investigate the relationship between the flow field complexity induced by desaturation and dispersion/mixing properties. We analyze the temporal behavior of the mean concentration gradient and the scalar dissipation rate, which quantify the temporal variation of the concentration variability and the potential for mixing-controlled chemical reactivity. The formation of preferential flowpaths in unsaturated flows is found to have an important impact on the mixing behavior. While the mean concentration gradient decays in time for saturated flow following the classical diffusive smoothing of concentration gradients, the creation of highly channelized finger structures in unsaturated flows induces persistently large concentration gradients which decay slowly in time. The highly resolved concentration field images show that this effect is due to i) a drastic increase of the surface available for creating concentration gradients across the finger boundaries, ii) the existence of dead-ends with

  10. Impact of hygrometry changes on creep behaviour of a porous rock and associated acoustic emission.

    NASA Astrophysics Data System (ADS)

    Grgic, D.; Amitrano, D.

    2009-04-01

    Static fatigue of a polycrystalline porous rock (iron ore) was studied by performing multi step uniaxial creep tests under partially saturated conditions, and the impact of water saturation was analyzed. The samples were, in a first step set to a partial water saturation of 90%. In a second step, the samples were saturated completely in order to simulate the impact of flooding corresponding to the conditions of abandoned iron mines. We recorded axial and transversal strain and acoustic emission (EA). The experimental results show that the water saturation induces a strong increase in AE activity and dilatant inelastic volumetric strain. This is associated with a notable decrease in Young's modulus and in the b-value of the Gutenberg-Richter law (i.e., the relative number of large-amplitude events increases) as the rock approaches failure, indicating that microfracturing plays an important role in the creep process. Water saturation accelerates static fatigue through hydro-mechanical coupling and subcritical stress corrosion cracking. The chemical reactions involved in the corrosion of iron ore and leading to a decrease in its intrinsic mechanical properties are described. These reactions play a major role in the static fatigue of iron ore, which on a large scale is probably the main mechanism explaining certain collapses in underground iron mines. It is also shown that creep straining of iron ore is partially reversible after stress removal, indicating that it results also from time-dependent viscoplastic mechanism (i.e., dislocation creep).

  11. Using bacterial bioluminescence to evaluate the impact of biofilm on porous media hydraulic properties.

    PubMed

    Bozorg, Ali; Gates, Ian D; Sen, Arindom

    2015-02-01

    Biofilm formation in natural and engineered porous systems can significantly impact hydrodynamics by reducing porosity and permeability. To better understand and characterize how biofilms influence hydrodynamic properties in porous systems, the genetically engineered bioluminescent bacterial strain Pseudomonas fluorescens HK44 was used to quantify microbial population characteristics and biofilm properties in a translucent porous medium. Power law relationships were found to exist between bacterial bioluminescence and cell density, fraction of void space occupied by biofilm (i.e. biofilm saturation), and hydraulic conductivity. The simultaneous evaluation of biofilm saturation and porous medium hydraulic conductivity in real time using a non-destructive approach enabled the construction of relative hydraulic conductivity curves. Such information can facilitate simulation studies related to biological activity in porous structures, and support the development of new models to describe the dynamic behavior of biofilm and fluid flow in porous media. The bioluminescence based approach described here will allow for improved understanding and control of industrially relevant processes such as biofiltration and bioremediation. PMID:25479429

  12. Protective Effectiveness of Porous Shields Under the Influence of High-Speed Impact Loading

    NASA Astrophysics Data System (ADS)

    Kramshonkov, E. N.; Krainov, A. V.; Shorohov, P. V.

    2016-02-01

    The results of numerical simulations of a compact steel impactor with the aluminum porous shields under high-speed shock loading are presented. The porosity of barrier varies in wide range provided that its mass stays the same, but the impactor has always equal (identical) mass. Here presented the final assessment of the barrier perforation speed depending on its porosity and initial shock speed. The range of initial impact speed varies from 1 to 10 km/s. Physical phenomena such as: destruction, melting, vaporization of a interacting objects are taken into account. The analysis of a shield porosity estimation disclosed that the protection effectiveness of porous shield reveals at the initial impact speed grater then 1.5 km/s, and it increases when initial impact speed growth.

  13. High Velocity Impact Interaction of Metal Particles with Porous Heterogeneous Materials with an Inorganic Matrix

    NASA Astrophysics Data System (ADS)

    Glazunov, A. A.; Ishchenko, A. N.; Afanasyeva, S. A.; Belov, N. N.; Burkin, V. V.; Rogaev, K. S.; Tabachenko, A. N.; Khabibulin, M. V.; Yugov, N. T.

    2016-03-01

    A computational-experimental investigation of stress-strain state and fracture of a porous heterogeneous material with an inorganic matrix, used as a thermal barrier coating of flying vehicles, under conditions of a high-velocity impact by a spherical steel projectile imitating a meteorite particle is discussed. Ballistic tests are performed at the velocities about 2.5 km/s. Numerical modeling of the high-velocity impact is described within the framework of a porous elastoplastic model including fracture and different phase states of the materials. The calculations are performed using the Euler and Lagrange numerical techniques for the velocities up to 10 km/s in a complete-space problem statement.

  14. Antipodal fragment velocities for porous and weak targets at catastrophic impacts

    NASA Technical Reports Server (NTRS)

    Yanagisawa, M.; Itoi, T.

    1993-01-01

    Mortar, porous alumina, and sand targets, which were spherical in shape and from 11 to 15 cm in diameter, were impacted normally by plastic (polycarbonate) projectiles of nearly 1 g in mass at velocities about 6 km/s. Fragment velocity at the antipole of impact site (antipodal velocity, V(sub a)), for each experiment, was obtained from two Flash X-ray images recorded prior to and at predetermined delayed time after impact event. It has been revealed that the velocities for the same E/M(sub t) (impact energy divided by target mass) depend strongly on target material, and differ about an order of magnitude between the sand and basalt.

  15. Impact experiments of exotic dust grain capture by highly porous primitive bodies

    NASA Astrophysics Data System (ADS)

    Okamoto, Takaya; Nakamura, Akiko M.; Hasegawa, Sunao; Kurosawa, Kosuke; Ikezaki, Katsutoshi; Tsuchiyama, Akira

    2013-05-01

    Small primitive bodies were presumably highly porous when they formed and some still have low densities that are indicative of a high pore content. Therefore, after their formation, interplanetary dust impacting on their surface may have been captured because of their porous structure. The mechanism of dust penetration is thus of importance to understand the evolution of small bodies and the origin of their internal dust particles. Impact experiments of sintered glass-bead targets characterized by 80%, 87%, and 94% bulk porosity were conducted using metal and basalt projectiles at impact velocities ranging from 1.6 to 7.2 km s-1. Track morphology and penetration processes were analyzed using both X-ray tomography and a flash X-ray system. Two types of track were observed, as previously also found in the Stardust aerogel: a thin and long track (carrot-shaped track), and a "bulb" with tails (bulb-shaped track). The track shape changed with initial dynamic pressure. We found that the transition between "carrot" and "bulb" occurred at a pressure of roughly 20 times the projectile's tensile strength. The deceleration process of projectiles without severe deformation and fragmentation was reproduced by a drag equation composed of an inertia drag that was proportional to the square of the projectile's velocity and a constant drag proportional to the target's compressive strength. We applied this deceleration equation to silicate dust penetrating into hypothetical porous icy bodies which were homogeneous on much smaller scales than the impacting dust particles. The penetration depth was approximately 100 times the projectile diameter for the bodies with 90% porosity.

  16. Propagation of impact-induced shock waves in porous sandstone using mesoscale modeling

    NASA Astrophysics Data System (ADS)

    GÜLdemeister, Nicole; WÜNnemann, Kai; Durr, Nathanael; Hiermaier, Stefan

    2013-01-01

    Abstract-Generation and propagation of shock waves by meteorite <span class="hlt">impact</span> is significantly affected by material properties such as porosity, water content, and strength. The objective of this work was to quantify processes related to the shock-induced compaction of pore space by numerical modeling, and compare the results with data obtained in the framework of the Multidisciplinary Experimental and Modeling <span class="hlt">Impact</span> Research Network (MEMIN) <span class="hlt">impact</span> experiments. We use mesoscale models resolving the collapse of individual pores to validate macroscopic (homogenized) approaches describing the bulk behavior of <span class="hlt">porous</span> and water-saturated materials in large-scale models of crater formation, and to quantify localized shock amplification as a result of pore space crushing. We carried out a suite of numerical models of planar shock wave propagation through a well-defined area (the "sample") of <span class="hlt">porous</span> and/or water-saturated material. The <span class="hlt">porous</span> sample is either represented by a homogeneous unit where porosity is treated as a state variable (macroscale model) and water content by an equation of state for mixed material (ANEOS) or by a defined number of individually resolved pores (mesoscale model). We varied porosity and water content and measured thermodynamic parameters such as shock wave velocity and particle velocity on meso- and macroscales in separate simulations. The mesoscale models provide additional data on the heterogeneous distribution of peak shock pressures as a consequence of the complex superposition of reflecting rarefaction waves and shock waves originating from the crushing of pores. We quantify the bulk effect of porosity, the reduction in shock pressure, in terms of Hugoniot data as a function of porosity, water content, and strength of a quartzite matrix. We find a good agreement between meso-, macroscale models and Hugoniot data from shock experiments. We also propose a combination of a porosity compaction model (ɛ-α model) that was</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015WRR....51.1315E','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015WRR....51.1315E"><span id="translatedtitle"><span class="hlt">Impact</span> of space-time mesh adaptation on solute transport modeling in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Esfandiar, Bahman; Porta, Giovanni; Perotto, Simona; Guadagnini, Alberto</p> <p>2015-02-01</p> <p>We implement a space-time grid adaptation procedure to efficiently improve the accuracy of numerical simulations of solute transport in <span class="hlt">porous</span> media in the context of model parameter estimation. We focus on the Advection Dispersion Equation (ADE) for the interpretation of nonreactive transport experiments in laboratory-scale heterogeneous <span class="hlt">porous</span> media. When compared to a numerical approximation based on a fixed space-time discretization, our approach is grounded on a joint automatic selection of the spatial grid and the time step to capture the main (space-time) system dynamics. Spatial mesh adaptation is driven by an anisotropic recovery-based error estimator which enables us to properly select the size, shape, and orientation of the mesh elements. Adaptation of the time step is performed through an ad hoc local reconstruction of the temporal derivative of the solution via a recovery-based approach. The <span class="hlt">impact</span> of the proposed adaptation strategy on the ability to provide reliable estimates of the key parameters of an ADE model is assessed on the basis of experimental solute breakthrough data measured following tracer injection in a nonuniform <span class="hlt">porous</span> system. Model calibration is performed in a Maximum Likelihood (ML) framework upon relying on the representation of the ADE solution through a generalized Polynomial Chaos Expansion (gPCE). Our results show that the proposed anisotropic space-time grid adaptation leads to ML parameter estimates and to model results of markedly improved quality when compared to classical inversion approaches based on a uniform space-time discretization.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26275609','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26275609"><span id="translatedtitle">Psychosocial <span class="hlt">impact</span> of <span class="hlt">involvement</span> in the Special Olympics.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Crawford, Clare; Burns, Jan; Fernie, Bruce A</p> <p>2015-01-01</p> <p>Existing evidence suggests that people with intellectual disabilities are vulnerable to low self-esteem leading to additional psychosocial issues such as social exclusion and stress. Previous research into the <span class="hlt">involvement</span> of Special Olympics (SO) of people with intellectual disabilities has indicted positive psychosocial outcomes. <span class="hlt">Involvement</span> in sport is known generally to have psychological and social benefits. This study aimed to compare the psychosocial <span class="hlt">impact</span> of <span class="hlt">involvement</span> in sport through the SO to no or limited sports <span class="hlt">involvement</span>, for a sample of people with intellectual disabilities. A cross sectional design was employed comparing three groups, SO, Mencap Sports, and Mencap No Sports on the variables: Self-esteem, quality of life, stress levels and social networks. One hundred and one participants were recruited either through the SO or Mencap. Data were collected through the completion of validated questionnaires by one to one interviews with the participants. Analysis revealed that self-esteem, quality of life, and stress were all significantly associated with SO <span class="hlt">involvement</span>. Logistic regression analysis was used to explore whether scores on these variables were able to predict group membership. Self-esteem was found to be a significant predictor of group membership, those in the SO having the highest self-esteem. The findings provide further evidence of a positive association between sport <span class="hlt">involvement</span> and increased psychological wellbeing, especially for those <span class="hlt">involved</span> in the SO. The implications of these findings for practice and future research into the relationship between sport and psychological wellbeing within the learning disabled population are considered. PMID:26275609</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2014AGUFM.H13A1061H&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2014AGUFM.H13A1061H&link_type=ABSTRACT"><span id="translatedtitle">The Efficiency Analysis of Low <span class="hlt">Impact</span> Development Applied in Taiwan: A Case Study of <span class="hlt">Porous</span> Pavement</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Huang, Y. H.; Liu, H. J.; Hsu, N. S.; Chang, F. M.</p> <p>2014-12-01</p> <p>Low <span class="hlt">Impact</span> Development (LID) has been developed since the end of 1990s. Lots of successful experience based on this new technology have been made. Taiwan Executive Yuan is conducting a six-year (2014~2019) program "Integrated River Basin Management Plan" applying LID to build sponge cities. Construction and Planning Agency, Ministry of the Interior is editing the manual of LID technology for Taiwan. However, since the hydrological environments, physiographic conditions, climates, the strength and frequency of disasters in Taiwan are different from that in America, this study takes the first laboratory experiment and model simulation to evaluate the efficiency of application of LID in Taiwan.LID Facilities includes <span class="hlt">porous</span> pavement, rain garden, green roof, tree box filter facilities and so on, and in this study, <span class="hlt">porous</span> pavement is taken as an example for discussion. In the part of laboratory experiments, the sand box experiments is designed to operate with the specified rainfall return period calculated by Horton formula and rainfall characteristics of Taipei. Then the outflow hydrograph in each designed rainfall of specified return period can be evaluated. As for model simulation, this study constructs LID simulation elements by SWMM model and tests the suitability for simulation of the outflow hydrograph obtained from experiments, and definitely quantifies the efficiency of water retention and flood reduction of <span class="hlt">porous</span> pavement. The results fits well with the experimental observation data with less than 10% error of pick flow. It suggests that, with LID simulation elements constructed in this study, the efficiency of LID in actual on-site application can be evaluated.The results shows that <span class="hlt">porous</span> pavement is able to delay arrival time of pick about 5% ~10% and reduce the pick flow about 5%~20%, and hold the ability of near 3~5% water retention. It proves that application of LID can retain water and reduce flood in Taiwan.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/27142952','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27142952"><span id="translatedtitle">Assessing the organizational <span class="hlt">impact</span> of patient <span class="hlt">involvement</span>: a first STEPP.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kreindler, Sara A; Struthers, Ashley</p> <p>2016-05-01</p> <p>Purpose - Patient <span class="hlt">involvement</span> in the design and improvement of health services is increasingly recognized as an essential part of patient-centred care. Yet little research, and no measurement tool, has addressed the organizational <span class="hlt">impacts</span> of such <span class="hlt">involvement</span>. The paper aims to discuss these issues. Design/methodology/approach - The authors developed and piloted the scoresheet for tangible effects of patient participation (STEPP) to measure the instrumental use of patient input. Its items assess the magnitude of each recommendation or issue brought forward by patients, the extent of the organization's response, and the apparent degree of patient influence on this response. In collaboration with teams (staff) from five <span class="hlt">involvement</span> initiatives, the authors collected interview and documentary data and scored the STEPP, first independently then jointly. Feedback meetings and a "challenges log" supported ongoing improvement. Findings - Although researchers' and teams' initial scores often diverged, the authors quickly reached consensus as new information was shared. Composite scores appeared to credibly reflect the degree of organizational <span class="hlt">impact</span>, and were associated with salient features of the <span class="hlt">involvement</span> initiatives. Teams described the STEPP as easy to use and useful for monitoring and accountability purposes. The tool seemed most suitable for initiatives in which patients generated novel, concrete recommendations; less so for broad public consultations of which instrumental use was not a primary goal. Originality/value - The STEPP is a promising, first-in-class tool with potential usefulness to both researchers and practitioners. With further research to better establish its reliability and validity, it could make a valuable contribution to full mixed-methods evaluation of patient <span class="hlt">involvement</span>. PMID:27142952</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li class="active"><span>1</span></li> <li><a href="#" onclick='return showDiv("page_2");'>2</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_1 --> <div id="page_2" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_1");'>1</a></li> <li class="active"><span>2</span></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="21"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013M%26PS...48....8P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013M%26PS...48....8P"><span id="translatedtitle">The MEMIN research unit: Scaling <span class="hlt">impact</span> cratering experiments in <span class="hlt">porous</span> sandstones</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Poelchau, Michael H.; Kenkmann, Thomas; Thoma, Klaus; Hoerth, Tobias; Dufresne, Anja; SchńFer, Frank</p> <p>2013-01-01</p> <p>The MEMIN research unit (Multidisciplinary Experimental and Modeling <span class="hlt">Impact</span> research Network) is focused on analyzing experimental <span class="hlt">impact</span> craters and experimental cratering processes in geological materials. MEMIN is interested in understanding how porosity and pore space saturation influence the cratering process. Here, we present results of a series of <span class="hlt">impact</span> experiments into <span class="hlt">porous</span> wet and dry sandstone targets. Steel, iron meteorite, and aluminum projectiles ranging in size from 2.5 to 12 mm were accelerated to velocities of 2.5-7.8 km s-1, yielding craters with diameters between 3.9 and 40 cm. Results show that the target's porosity reduces crater volumes and cratering efficiency relative to nonporous rocks. Saturation of pore space with water to 50% and 90% increasingly counteracts the effects of porosity, leading to larger but flatter craters. Spallation becomes more dominant in larger-scale experiments and leads to an increase in cratering efficiency with increasing projectile size for constant <span class="hlt">impact</span> velocities. The volume of spalled material is estimated using parabolic fits to the crater morphology, yielding approximations of the transient crater volume. For <span class="hlt">impacts</span> at the same velocity these transient craters show a constant cratering efficiency that is not affected by projectile size.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015WRR....51.2634N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015WRR....51.2634N"><span id="translatedtitle"><span class="hlt">Impact</span> of viscous fingering and permeability heterogeneity on fluid mixing in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Nicolaides, Christos; Jha, Birendra; Cueto-Felgueroso, Luis; Juanes, Ruben</p> <p>2015-04-01</p> <p>Fluid mixing plays a fundamental role in many natural and engineered processes, including groundwater flows in <span class="hlt">porous</span> media, enhanced oil recovery, and microfluidic lab-on-a-chip systems. Recent developments have explored the effect of viscosity contrast on mixing, suggesting that the unstable displacement of fluids with different viscosities, or viscous fingering, provides a powerful mechanism to increase fluid-fluid interfacial area and enhance mixing. However, existing studies have not incorporated the effect of medium heterogeneity on the mixing rate. Here, we characterize the evolution of mixing between two fluids of different viscosity in heterogeneous <span class="hlt">porous</span> media. We focus on a practical scenario of divergent-convergent flow in a quarter five spot geometry prototypical of well-driven groundwater flows. We study by means of numerical simulations the <span class="hlt">impact</span> of permeability heterogeneity and viscosity contrast on the breakthrough curves and mixing efficiency, and we rationalize the nontrivial mixing behavior that emerges from the competition between the creation of fluid-fluid interfacial area and channeling.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2001AGUFM.H51A0304M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2001AGUFM.H51A0304M"><span id="translatedtitle"><span class="hlt">Impact</span> of Moisture Content and Grain Size on Hydrocarbon Diffusion in <span class="hlt">Porous</span> Media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>McLain, A. A.; Ho, C. K.</p> <p>2001-12-01</p> <p>Diffusion of hydrocarbon vapors in <span class="hlt">porous</span> media can play an important role in our ability to characterize subsurface contaminants such as trichloroethylene (TCE). For example, traditional monitoring methods often rely on direct sampling of contaminated soils or vapor. These samples may be influenced by the diffusion of vapors away from the contaminant source term, such as non-aqueous-phase TCE liquid. In addition, diffusion of hydrocarbon vapors can also <span class="hlt">impact</span> the migration and dispersion of the contaminant in the subsurface. Therefore, understanding the diffusion rates and vapor transport processes of hydrocarbons in variably-saturated, heterogeneous <span class="hlt">porous</span> media will assist in the characterization and detection of these subsurface contaminants. The purpose of this study was to investigate the <span class="hlt">impact</span> of soil heterogeneity and water-moisture content on the diffusion processes for TCE. A one-dimensional column experiment was used to monitor the rates of vapor diffusion through sand. Experiments were performed with different average water-moisture contents and different grain sizes. On one end of the column, a reservoir cap is used to encase the TCE, providing a constant vapor boundary condition while sealing the end. The other end of the column contains a novel microchemical sensor. The sensor employs a polymer-absorption resistor (chemiresistor) that reversibly swells and increases in resistance when exposed to hydrocarbons. Once calibrated, the chemiresistors can be used to passively monitor vapor concentrations. This unique method allows the detection of in-situ vapor concentrations without disturbing the local environment. Results are presented in the form of vapor-concentration breakthrough curves as detected by the sensor. The shape of the breakthrough curve is dependent on several key parameters, including the length of the column and parameters (e.g., water-moisture content and grain-size) that affect the effective diffusion coefficient of TCE in air</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/23367938','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/23367938"><span id="translatedtitle"><span class="hlt">Impact</span> on <span class="hlt">porous</span> targets: penetration, crater formation, target compaction, and ejection.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ringl, Christian; Bringa, Eduardo M; Urbassek, Herbert M</p> <p>2012-12-01</p> <p>Using a granular-mechanics code, we study the <span class="hlt">impact</span> of a sphere into a <span class="hlt">porous</span> adhesive granular target, consisting of monodisperse silica grains. The model includes elastic repulsive, adhesive, and dissipative forces, as well as sliding, rolling, and twisting friction. <span class="hlt">Impact</span> velocities of up to 30 m/s and target filling factors (densities) between 19% and 35% have been systematically studied. We find that the projectile is stopped by an effective drag force which is proportional to the square of its velocity. Target adhesion influences projectile stopping only below a critical velocity, which increases with adhesion. The penetration depth depends approximately logarithmically on the <span class="hlt">impact</span> velocity and is inversely proportional to the target density. The excavated crater is of conical form and is surrounded by a compaction zone whose width increases but whose maximum value decreases with increasing target density. Grain ejection increases in proportion with impactor velocity. Grains are ejected which have originally been buried to a depth of 8R(grain) below the surface; the angular distribution favors oblique ejection with a maximum around 45°. The velocity distribution of ejected grains features a broad low-velocity maximum around 0.5-1 m/s but exhibits a high-velocity tail up to ~15% of the projectile <span class="hlt">impact</span> velocity. PMID:23367938</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015WRR....51.8973M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015WRR....51.8973M"><span id="translatedtitle">The <span class="hlt">impact</span> of immobile zones on the transport and retention of nanoparticles in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Molnar, Ian L.; Gerhard, Jason I.; Willson, Clinton S.; O'Carroll, Denis M.</p> <p>2015-11-01</p> <p>Nanoparticle transport and retention within <span class="hlt">porous</span> media is treated by conceptualizing the <span class="hlt">porous</span> media as a series of independent collectors (e.g., Colloid Filtration Theory). This conceptualization assumes that flow phenomena near grain-grain contacts, such as immobile zones (areas of low flow), exert a negligible influence on nanoparticle transport and assumes that retention and release of particles depends only on surface chemistry. This study investigated the <span class="hlt">impact</span> of immobile zones on nanoparticle transport and retention by employing synchrotron X-ray computed microtomography (SXCMT) to examine pore-scale silver nanoparticle distributions during transport through three sand columns: uniform iron oxide, uniform quartz, and well-graded quartz. Extended tailing was observed during the elution phase of all experiments suggesting that hydraulic retention in immobile zones, not detachment from grains, was the source of tailing. A numerical simulation of fluid flow through an SXCMT data set predicted the presence of immobile zones near grain-grain contacts. SXCMT-determined silver nanoparticle concentrations observed that significantly lower nanoparticle concentrations existed near grain-grain contacts throughout the duration of all experiments. In addition, the SXCMT-determined pore-scale concentration gradients were found to be independent of surface chemistry and grain size distribution, suggesting that immobile zones limit the diffusive transport of nanoparticles toward the collectors. These results suggest that the well-known overprediction of nanoparticle retention by traditional CFT may be due to ignoring the influences of grain-grain contacts and immobile zones. As such, accurate prediction of nanoparticle transport requires consideration of immobile zones and their influence on both hydraulic and surface retention.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/894846','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/894846"><span id="translatedtitle"><span class="hlt">Impact</span> of microbial growth on water flow and solute transport in unsaturated <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Yarwood, R. R.; Rockhold, M. L.; Niemet, M. R.; Selker, John S.; Bottomley, Peter J.</p> <p>2006-10-05</p> <p>A novel analytical method was developed that permitted real-time, noninvasive measurements of microbial growth and associated changes in hydrodynamic properties in <span class="hlt">porous</span> media under unsaturated flowing conditions. Salicylate-induced, lux gene-based bioluminescence was used to quantify the temporal and spatial development of colonization over a seven day time course. Water contents were determined daily by measuring light transmission through the system. Hydraulic flow paths were determined daily by pulsing a bromophenol blue dye solution through the colonized region of the sand. Bacterial growth and accumulation had a significant <span class="hlt">impact</span> on the hydraulic properties of the <span class="hlt">porous</span> media. Microbial colonization caused localized drying within the colonized zone, with decreases in saturation approaching 50% of antecedent values, and a 25% lowering of the capillary fringe height. Flow was retarded within the colonized zone and diverted around it. The apparent solute velocity through the colonized region was reduced from 0.41 cm min 1 (R2 = 0.99) to 0.25 cm min 1 (R2 = 0.99) by the sixth day of the experiment, associated with maximum population densities that would occupy about 7% of the available pore space within the colonized region. Changes in the extent of colonization occurred over the course of the experiment, including upward migration against flow. The distribution of cells was not determined by water flow alone, but rather by a dynamic interaction between water flow and microbial growth. This experimental system provides rich data sets for the testing of conceptualizations expressed through numerical modeling.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/921683','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/921683"><span id="translatedtitle"><span class="hlt">IMPACT</span> OF COMPOSITION AND HEAT TREATMENT ON PORE SIZE IN <span class="hlt">POROUS</span> WALLED HOLLOW GLASS MICROSPHERES</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Raszewski, F; Erich Hansen, E; Ray Schumacher, R; David Peeler, D</p> <p>2007-12-04</p> <p>The Savannah River National Laboratory (SRNL) developed a new geometric form: hollow glass microspheres (HGMs), with unique <span class="hlt">porous</span> walls. The new geometric form combines the existing technology of HGMs with basic glass science knowledge in the realm of glass-in-glass phase separation. Conceptually, the development of a HGM with <span class="hlt">porous</span> walls (referred to as a PWHGM) provides a unique system in which various media or filling agents can be incorporated into the PWHGM (via transport through the <span class="hlt">porous</span> walls) and ultimately has the capacity to serve as a functional delivery system in various industrial applications. Applications of these types of systems could range from hydrogen storage, molecular sieves, drug and bioactive delivery systems, to environmental, chemical and biological indicators, relevant to Energy, Environmental Processing and Homeland Security fields. As a specific example, previous studies at SRNL have introduced materials capable of hydrogen storage (as well as other materials) into the interior of the PWHGMs. The goal of this project was to determine if the microstructure (i.e., pore size and pore size distribution) of a PWHGM could be altered or tailored by varying composition and/or heat treatment (time and/or temperature) conditions. The ability to tailor the microstructure through composition or heat treatments could provide the opportunity to design the PWHGM system to accommodate different additives or fill agents. To meet this objective, HGMs of various alkali borosilicate compositions were fabricated using a flame forming apparatus installed at the Aiken County Technical Laboratory (ACTL). HGMs were treated under various heat treatment conditions to induce and/or enhance glass in glass phase separation. Heat treatment temperatures ranged from 580 C to 620 C, while heat treatment times were either 8 or 24 hours. Of the two primary variables assessed in this study, heat treatment temperature was determined to be most effective in changing the</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=parental+AND+involvement+AND+classroom&pg=3&id=ED552172','ERIC'); return false;" href="http://eric.ed.gov/?q=parental+AND+involvement+AND+classroom&pg=3&id=ED552172"><span id="translatedtitle">The <span class="hlt">Impact</span> of Parental <span class="hlt">Involvement</span> on Kindergarten Student Writing Development</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Anderson, Somer Knight</p> <p>2013-01-01</p> <p>Although researchers have studied parental <span class="hlt">involvement</span> and reading achievement, few have examined the effects of parental <span class="hlt">involvement</span> on young children's developmental writing. The purpose of this study was to explore the relationship between parent <span class="hlt">involvement</span> in a writing workshop and the writing development of kindergarten students in an…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014AdWR...73..123M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014AdWR...73..123M"><span id="translatedtitle"><span class="hlt">Impacts</span> of transport mechanisms and plume history on tailing of sorbing plumes in heterogeneous <span class="hlt">porous</span> formations</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Maghrebi, Mahdi; Jankovic, Igor; Allen-King, Richelle M.; Rabideau, Alan J.; Kalinovich, Indra; Weissmann, Gary S.</p> <p>2014-11-01</p> <p>This work investigated the <span class="hlt">impacts</span> of permeability and sorption heterogeneity on contaminant transport in groundwater using simulation experiments designed to elucidate the causes of tailing. The effects of advection, diffusion and sorption mechanisms and plume history were explored. A simple conceptual model consisting of a single inclusion (heterogeneity) of uniform hydraulic conductivity K and sorption distribution coefficient Kd was adopted. The 3D inclusion, shaped as a horizontal oblate ellipsoid of variable thickness, was placed in a homogeneous anisotropic background of different hydraulic conductivity and sorption distribution coefficient. The background represents average K and Kd of a heterogeneous <span class="hlt">porous</span> formation. A closed-form analytic flow solution for uniform flow past the inclusion was coupled with a numerical transport solution to simulate contaminant migration for a wide range of transport parameters and two distinct source conditions. Over 2600 numerical simulations were performed in parallel. Transport results were presented in terms of travel time distributions at a control plane downstream of the inclusion and used to quantify tailing for a wide range of transport parameters, in order to separate advection-dominated from diffusion-dominated transport regime and to investigate effects of inclusion shape, diffusion, sorption and plume history on tailing.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014AGUFM.H33D0852N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014AGUFM.H33D0852N"><span id="translatedtitle"><span class="hlt">Impact</span> of viscous fingering and permeability heterogeneity on fluid mixing in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Nicolaides, C.; Jha, B.; Cueto-Felgueroso, L.; Juanes, R.</p> <p>2014-12-01</p> <p>Fluid mixing plays a fundamental role in many natural and engineered processes, including groundwater flows in <span class="hlt">porous</span> media, enhanced oil recovery, and microfluidic lab-on-a-chip systems[1]. Recent developments have explored the effect of viscosity contrast on mixing, suggesting that the unstable displacement of fluids with different viscosities, or viscous fingering, provides a powerful mechanism to increase fluid--fluid interfacial area and enhance mixing[2]. In this paper, we revisit the problem of subsurface contaminant transport through a heterogeneous aquifer in a quarter five-spot geometry[3] and we focus on the <span class="hlt">impact</span> of two principal sources of disorder in the flow field: viscosity contrast between the fluids and heterogeneity in the permeability field. We consider a wide range of viscosity ratios of the contaminant and the water, from a less viscous to a more viscous contaminant, flowing through a range of permeability fields, from almost homogeneous to strongly heterogeneous. We ask the following practical question: how does the interplay between viscosity contrast and permeability heterogeneity determine the evolution of macroscopic quantities that characterize the spatial structure and temporal evolution of a contaminant plume? We answer this question by conducting high resolution simulations of contaminant flow and transport in an aquifer, and by analyzing both point measurements of contaminant breakthrough and clean-up times as well as global degree of mixing and dilution of the contaminant plume. [1] M. Dentz, T. Le Borgne, A. Englert, and B. Bijeljic, Mixing, spreading and reaction in heterogeneous media: A brief review, J. Contam. Hydrol. 120, 1-17 (2011). [2] B. Jha, L. Cueto-Felgueroso, and R. Juanes, Fluid mixing from viscous fingering. Phys. Rev. Lett. 106, 194502 (2011) [3] J. Luo, M. Dentz, O. A. Cirpka, and P. K. Kitanidis, Breakthrough curve tailing in a dipole flow field, Water Resour. Res. 43(9), W09403 (2007).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=sport+AND+university+AND+organization&pg=3&id=EJ816872','ERIC'); return false;" href="http://eric.ed.gov/?q=sport+AND+university+AND+organization&pg=3&id=EJ816872"><span id="translatedtitle"><span class="hlt">Impacts</span> of Campus <span class="hlt">Involvement</span> on Hospitality Student Achievement and Satisfaction</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Yin, Dean; Lei, Simon A.</p> <p>2007-01-01</p> <p>Campus <span class="hlt">involvement</span> affecting satisfaction and academic achievement (overall grade point average) of hospitality undergraduate students at a state university in the Midwest (University X) was investigated through a survey research. A four-part survey instrument was developed to facilitate this study. There were a number of academic, professional,…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3773043','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3773043"><span id="translatedtitle">Combined Orbital Floor and Medial Wall Fractures <span class="hlt">Involving</span> the Inferomedial Strut: Repair Technique and Case Series Using Preshaped <span class="hlt">Porous</span> Polyethylene/Titanium Implants</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Cho, Raymond I.; Davies, Brett W.</p> <p>2013-01-01</p> <p>Background Combined orbital floor and medial wall fractures can be technically challenging to repair, particularly when the inferomedial strut is <span class="hlt">involved</span>. A surgical repair technique is described utilizing a single preshaped <span class="hlt">porous</span> polyethylene/titanium implant to span both defects. Methods Retrospective interventional case series. Results Fracture repair was performed on 17 orbits (16 patients) between October 2009 and February 2012. Subsequent surgical revision was required in three cases (18%). Visual acuity was stable or improved in all cases. Of 7 patients with preoperative diplopia, 5 improved and 2 remained stable postoperatively, and there were no cases of new or worsened diplopia following surgery. Postoperative asymmetry in Hertel exophthalmometry averaged 1.0 mm (range 0 to 2 mm). Preoperatively, average orbital volume was 122.7% compared with control (range 109 to 147%, standard deviation [SD] 9.6), which improved to 100.3% postoperatively (range 92 to 110%, SD 5.7). The average decrease in orbital volume was 22.5% (range 10 to 54%, SD 11.4, p < 0.001). Conclusions With careful preoperative planning and meticulous surgical technique, combined orbital floor and medial wall fractures <span class="hlt">involving</span> the inferomedial strut can be successfully repaired with a preshaped <span class="hlt">porous</span> polyethylene/titanium implant through a transconjunctival/transcaruncular approach with inferior oblique disinsertion. PMID:24436754</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015AGUFM.H54F..03S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015AGUFM.H54F..03S"><span id="translatedtitle">Modeling the <span class="hlt">Impact</span> of Fracture Growth on Fluid Displacements in Deformable <span class="hlt">Porous</span> Media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Santillán, D.; Cueto-Felgueroso, L.; Juanes, R.</p> <p>2015-12-01</p> <p>Coupled flow and geomechanics is a critical research challenge in engineering and the geosciences. The flow of a fluid through a deformable <span class="hlt">porous</span> media is present in manyenvironmental, industrial, and biological processes,such as the removal of pollutants from underground water bodies, enhanced geothermal systems, unconventional hydrocarbon resources or enhanced oil recovery techniques. However, the injection of a fluid can generate or propagate fractures, which are preferential flow paths. Using numerical simulation, we study the interplay between injection and rock mechanics, and elucidate fracture propagation as a function of injection rate, initial crack topology and mechanical rock properties. Finally, we discuss the role of fracture growth on fluid displacements in <span class="hlt">porous</span> media. Figure: An example of fracture (in red) propagated in a <span class="hlt">porous</span> media (in blue)</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/14827','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/14827"><span id="translatedtitle">Tailored <span class="hlt">Porous</span> Materials</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>BARTON,THOMAS J.; BULL,LUCY M.; KLEMPERER,WALTER G.; LOY,DOUGLAS A.; MCENANEY,BRIAN; MISONO,MAKOTO; MONSON,PETER A.; PEZ,GUIDO; SCHERER,GEORGE W.; VARTULI,JAMES C.; YAGHI,OMAR M.</p> <p>1999-11-09</p> <p>Tailoring of <span class="hlt">porous</span> materials <span class="hlt">involves</span> not only chemical synthetic techniques for tailoring microscopic properties such as pore size, pore shape, pore connectivity, and pore surface reactivity, but also materials processing techniques for tailoring the meso- and the macroscopic properties of bulk materials in the form of fibers, thin films and monoliths. These issues are addressed in the context of five specific classes of <span class="hlt">porous</span> materials: oxide molecular sieves, <span class="hlt">porous</span> coordination solids, <span class="hlt">porous</span> carbons, sol-gel derived oxides, and <span class="hlt">porous</span> heteropolyanion salts. Reviews of these specific areas are preceded by a presentation of background material and review of current theoretical approaches to adsorption phenomena. A concluding section outlines current research needs and opportunities.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26583740','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26583740"><span id="translatedtitle"><span class="hlt">Impact</span> of biofilm on bacterial transport and deposition in <span class="hlt">porous</span> media.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Bozorg, Ali; Gates, Ian D; Sen, Arindom</p> <p>2015-12-01</p> <p>Laboratory scale experiments were conducted to obtain insights into factors that influence bacterial transport and deposition in <span class="hlt">porous</span> media. According to colloidal filtration theory, the removal efficiency of a filter medium is characterized by two main factors: collision efficiency and sticking efficiency. In the case of bacterial transport in <span class="hlt">porous</span> media, bacteria attached to a solid surface can establish a thin layer of biofilm by excreting extracellular polymeric substances which can significantly influence both of these factors in a <span class="hlt">porous</span> medium, and thus, affect the overall removal efficiency of the filter medium. However, such polymeric interactions in bacterial adhesion are not well understood and a method to calculate polymeric interactions is not yet available. Here, to determine how the migration of bacteria flowing within a <span class="hlt">porous</span> medium is affected by the presence of surface-associated extracellular polymeric substances previously produced and deposited by the same bacterial species, a commonly used colloidal filtration model was applied to study transport and deposition of Pseudomonas fluorescens in small-scale columns packed with clean and biofilm coated glass beads. Bacterial recoveries were monitored in column effluents and used to quantify biofilm interactions and sticking efficiencies of the biofilm coated packed-beds. The results indicated that, under identical hydraulic conditions, the sticking efficiencies in packed-beds were improved consistently by 36% when covered by biofilm. PMID:26583740</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2015JCHyd.183..109B&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2015JCHyd.183..109B&link_type=ABSTRACT"><span id="translatedtitle"><span class="hlt">Impact</span> of biofilm on bacterial transport and deposition in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bozorg, Ali; Gates, Ian D.; Sen, Arindom</p> <p>2015-12-01</p> <p>Laboratory scale experiments were conducted to obtain insights into factors that influence bacterial transport and deposition in <span class="hlt">porous</span> media. According to colloidal filtration theory, the removal efficiency of a filter medium is characterized by two main factors: collision efficiency and sticking efficiency. In the case of bacterial transport in <span class="hlt">porous</span> media, bacteria attached to a solid surface can establish a thin layer of biofilm by excreting extracellular polymeric substances which can significantly influence both of these factors in a <span class="hlt">porous</span> medium, and thus, affect the overall removal efficiency of the filter medium. However, such polymeric interactions in bacterial adhesion are not well understood and a method to calculate polymeric interactions is not yet available. Here, to determine how the migration of bacteria flowing within a <span class="hlt">porous</span> medium is affected by the presence of surface-associated extracellular polymeric substances previously produced and deposited by the same bacterial species, a commonly used colloidal filtration model was applied to study transport and deposition of Pseudomonas fluorescens in small-scale columns packed with clean and biofilm coated glass beads. Bacterial recoveries were monitored in column effluents and used to quantify biofilm interactions and sticking efficiencies of the biofilm coated packed-beds. The results indicated that, under identical hydraulic conditions, the sticking efficiencies in packed-beds were improved consistently by 36% when covered by biofilm.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005cmns.conf..771C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005cmns.conf..771C"><span id="translatedtitle"><span class="hlt">Impact</span> of Boundary Effects <span class="hlt">Involving</span> Broken Gauge Symmetry on Lenr's</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chubb, Scott R.</p> <p>2005-12-01</p> <p>Surfaces have a huge <span class="hlt">impact</span> on the physics and chemistry of solids. Changes in surfaces (or other boundaries of a solid), in particular, can be related to changes in the local ("chemical") environment. In the idealized limit, in which surfaces are defined as "boundaries" associated with a lack of, or accumulation of charge, dynamical effects at surfaces can be used and are required (by the associated coupling to external electromagnetic fields) to relate seemingly unrelated local and non-local effects. Thus, counter-intuitive ideas about local and non-local effects can become dominant. In particular, in PdH or PdD, provided external forces are applied uniformly, it is entirely possible for hydrogen (p) or deuterium (d) nuclei to acquire a common phase (a broken gauge symmetry1) and to "become wave-like" and interact coherently, through the electromagnetic field, simultaneously, but an isotropically at the boundaries of a PdD or PdH substrate, or at isolated locations within either substrate. Also, these effects can create coupling between localized and delocalized forms of interaction. We use these and related effects as the basis for suggesting new experiments that have bearing on the findings of Iwamura et al., concerning the "apparent" transmutation of Cs-Pr.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=positive+AND+parenting+AND+style&pg=5&id=EJ571135','ERIC'); return false;" href="http://eric.ed.gov/?q=positive+AND+parenting+AND+style&pg=5&id=EJ571135"><span id="translatedtitle">Understanding the <span class="hlt">Impact</span> of Parent School <span class="hlt">Involvement</span> on Children's Educational Outcomes.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Zellman, Gail L.; Waterman, Jill M.</p> <p>1998-01-01</p> <p>Investigated the <span class="hlt">impact</span> of parental <span class="hlt">involvement</span> on elementary students' educational outcomes. Data from a study of 193 Los Angeles area second and fifth graders and their mothers indicated that parent school <span class="hlt">involvement</span> contributes to positive child outcomes. The <span class="hlt">involvement</span> appears to be a manifestation of parental enthusiasm and positive…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22107848','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22107848"><span id="translatedtitle"><span class="hlt">Impact</span> of <span class="hlt">porous</span> medium on the high cycle temperature fluctuations in a mixing tee</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Bu, L.; Zhao, J.</p> <p>2012-07-01</p> <p>Temperature fluctuations occur in the region where hot and cold fluids mix turbulently in the nuclear power plants. Temperature fluctuations cause thermal fatigue of piping systems. In the design of generation IV nuclear power plants, supercritical fluids are supposed to be used widely. This paper investigated the thermal striping phenomenon caused by the turbulent mixing in a supercritical water Tee. There are two key issues in the study of thermal striping phenomenon: One is to find the region which experiences the peak temperature fluctuation; the other is how to attenuate it. <span class="hlt">Porous</span> media was used to attenuate the temperature fluctuations in this paper. The results show that <span class="hlt">porous</span> media with proper parameters in a tee can reduce the temperature fluctuations magnificently. (authors)</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016JPS...320...59S&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016JPS...320...59S&link_type=ABSTRACT"><span id="translatedtitle">Atomic structural and electrochemical <span class="hlt">impact</span> of Fe substitution on nano <span class="hlt">porous</span> LiMnPO4</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Seo, Inseok; Senthilkumar, B.; Kim, Kwang-Ho; Kim, Jae-Kwang; Kim, Youngsik; Ahn, Jou-Hyeon</p> <p>2016-07-01</p> <p>The atomic structural and electrochemical properties of Fe substituted nano <span class="hlt">porous</span> LiMn1-xFexPO4 (x = 0-0.8) composites are investigated and compared. X-ray scattering method is used for atomic structural investigation. Rietveld refinement shows that all Fe substituted composites have the same olivine structure (Pnma) with lithium occupying octahedral 4a sites, Fe2+ replacing Mn2+ at the octahedral 4c sites. The a, b, c parameters and cell volume decrease with the addition of Fe2+. When the nano <span class="hlt">porous</span> LiMn1-xFexPO4 composites are evaluated as cathode materials in lithium cells at room temperature, x = 0.6, and 0.8 resulted in the best overall electrochemical performance, exhibiting stable cycling and high discharge capacities of 149 and 154 mA h g-1, respectively. The composites with above x = 0.4 show a fast lithium ions transfer with high electronic conductivity because Fe transition metal substitution reduce the partly occupation of Mn in the M1 (LiO6) sites and thereby Mn block the lithium ion diffusion pathway. We here firstly find the antisite defect in the high Mn content in <span class="hlt">porous</span> LiMn1-xFexPO4 composites.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_1");'>1</a></li> <li class="active"><span>2</span></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_2 --> <div id="page_3" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_1");'>1</a></li> <li><a href="#" onclick='return showDiv("page_2");'>2</a></li> <li class="active"><span>3</span></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="41"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016AIPC.1698d0009I','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016AIPC.1698d0009I"><span id="translatedtitle">High-speed <span class="hlt">impact</span> of the metal projectile on the barrier containing <span class="hlt">porous</span> corundum-based ceramics with chemically active filler</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ischenko, Alexander; Afanas'eva, Svetlana; Belov, Nikolai; Blinov, Vasiliy; Burkin, Vladimir; Korolkov, Leonid; Rogaev, Konstantin; Khabibullin, Marat; Yugov, Nikolai</p> <p>2016-01-01</p> <p>The paper presents a calculation-experimental study on high-speed interaction of the metal projectile with a combined barrier made of <span class="hlt">porous</span> corundum-based ceramics filled with chemically active composition (sulfur, nitrate of potash) in the wide range of speeds. A mathematical behavior model of <span class="hlt">porous</span> corundum-based ceramics with chemically active filler is developed within the scope of mechanics of continuous media taking into account the energy embedding from a possible chemical reaction between a projectile metal and filler at high-speed <span class="hlt">impact</span>. Essential embedding of inlet heat is not observed in the considered range of <span class="hlt">impact</span> speeds (2.5 … 8 km/s).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015AGUFM.H31A1407W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015AGUFM.H31A1407W"><span id="translatedtitle">Free and Forced Convection in High Permeability <span class="hlt">Porous</span> Media: <span class="hlt">Impact</span> on Gas Flux at the Earth-atmosphere Interface</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Weisbrod, N.; Levintal, E.; Dragila, M. I.; Kamai, T.</p> <p>2015-12-01</p> <p>Gas movement within the earth's subsurface and its exchange with the atmosphere is one of the principal elements contributing to soil and atmospheric function. As the soil permeability increases, gas circulation by convective mechanisms becomes significantly greater than the diffusion. Two of the convective mechanisms, which can be of great importance, are being explored in this research. The first one is thermal convection venting (TCV), which develops when there are unstable density gradients. The second mechanism is wind induced convection (WIC), which develops due to surface winds that drive air movement. Here, we report the results of a study on the relationships between the <span class="hlt">porous</span> media permeability and particle size, and the development and magnitude of TCV and WIC with the development of thermal differences and surface winds. The research included large high-permeability column experiments carried out under highly controlled laboratory conditions, using well-defined single-sized spherical particles while surface winds and thermal differences were forced and monitored. CO2 enriched air, functioned as a tracer, was used to quantify the <span class="hlt">impact</span> of TCV and WIC on gas migration in the <span class="hlt">porous</span> media. Results show that in homogenous <span class="hlt">porous</span> media a permeability range of 10-7 to 10-6 m2 is the threshold value for TCV onset under standard atmospheric conditions. Adding surface wind with an average velocity of 1.5 m s-1 resulted in WIC effect to a depth of -0.3 m in most experimental settings; however, it did not caused additional air circulation at the reference depth of -0.9 m. Furthermore, given the appropriate conditions, a combined effect of TCV and WIC did significantly increase the overall media ventilation. Simulations of temperature profiles in soil under that permeability, showed that as the thermal gradient changes with depth and is a continuous function, TCV cells can be developed in local sections of the profile, not necessarily reaching the atmosphere.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014WRR....50.9103K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014WRR....50.9103K"><span id="translatedtitle"><span class="hlt">Impact</span> of biofilm-induced heterogeneities on solute transport in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kone, T.; Golfier, F.; Orgogozo, L.; Oltéan, C.; Lefèvre, E.; Block, J. C.; Buès, M. A.</p> <p>2014-11-01</p> <p>In subsurface systems, biofilm may degrade organic or organometallic pollutants contributing to natural attenuation and soil bioremediation techniques. This increase of microbial activity leads to change the hydrodynamic properties of aquifers. The purpose of this work was to investigate the influence of biofilm-induced heterogeneities on solute transport in <span class="hlt">porous</span> media and more specifically on dispersivity. We pursued this goal by (i) monitoring both spatial concentration fields and solute breakthrough curves from conservative tracer experiments in a biofilm-supporting <span class="hlt">porous</span> medium, (ii) characterizing in situ the changes in biovolume and visualizing the dynamics of the biological material at the mesoscale. A series of experiments was carried out in a flow cell system (60 cm3) with a silica sand (Φ = 50-70 mesh) as solid carrier and Shewanella oneidensis MR-1 as bacterial strain. Biofilm growth was monitored by image acquisition with a digital camera. The biofilm volume fraction was estimated through tracer experiments with the Blue Dextran macromolecule as in size-exclusion chromatography, leading to a fair picture of the biocolonization within the flow cell. Biofilm growth was achieved in the whole flow cell in 29 days and up to 50% of void space volume was plugged. The influence of biofilm maturation on <span class="hlt">porous</span> medium transport properties was evaluated from tracer experiments using Brilliant Blue FCF. An experimental correlation was found between effective (i.e., nonbiocolonized) porosity and biofilm-affected dispersivity. Comparison with values given by the theoretical model of Taylor and Jaffé (1990b) yields a fair agreement.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26821548','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26821548"><span id="translatedtitle">Decreasing Risky Behavior on Social Network Sites: The <span class="hlt">Impact</span> of Parental <span class="hlt">Involvement</span> in Secondary Education Interventions.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Vanderhoven, Ellen; Schellens, Tammy; Valcke, Martin</p> <p>2016-06-01</p> <p>Teenagers face significant risks when using increasingly popular social network sites. Prevention and intervention efforts to raise awareness about these risks and to change risky behavior (so-called "e-safety" interventions) are essential for the wellbeing of these minors. However, several studies have revealed that while school interventions often affect awareness, they have only a limited <span class="hlt">impact</span> on pupils' unsafe behavior. Utilizing the Theory of Planned Behavior and theories about parental <span class="hlt">involvement</span>, we hypothesized that <span class="hlt">involving</span> parents in an e-safety intervention would positively influence pupils' intentions and behavior. In a quasi-experimental study with pre- and post-test measures <span class="hlt">involving</span> 207 pupils in secondary education, we compared the <span class="hlt">impact</span> of an intervention without parental <span class="hlt">involvement</span> with one that included active parental <span class="hlt">involvement</span> by means of a homework task. We found that whereas parental <span class="hlt">involvement</span> was not necessary to improve the intervention's <span class="hlt">impact</span> on risk awareness, it did change intentions to engage in certain unsafe behavior, such as posting personal and sexual information on the profile page of a social network site, and in reducing existing problematic behavior. This beneficial <span class="hlt">impact</span> was particularly evident for boys. These findings suggest that developing prevention campaigns with active parental <span class="hlt">involvement</span> is well worth the effort. Researchers and developers should therefore focus on other efficient strategies to <span class="hlt">involve</span> parents. PMID:26821548</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/EJ1054940.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/EJ1054940.pdf"><span id="translatedtitle">The <span class="hlt">Impact</span> of <span class="hlt">Involving</span> Students in Managing the Quality of Higher Education Provision</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Garwe, Evelyn Chiyevo</p> <p>2015-01-01</p> <p>This study was aimed at exploring the power of student <span class="hlt">involvement</span> in improving quality of higher educational provision in private higher education institutions in Zimbabwe. A longitudinal approach <span class="hlt">involving</span> two separate surveys and covering a period of three years was used. A preliminary survey aimed at assessing the issues that <span class="hlt">impact</span> negatively…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=work+AND+motivation&pg=6&id=ED531436','ERIC'); return false;" href="http://eric.ed.gov/?q=work+AND+motivation&pg=6&id=ED531436"><span id="translatedtitle">The <span class="hlt">Impact</span> of Motivation to Lead on College Students' Cocurricular <span class="hlt">Involvement</span></span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Pepper, Robert C.</p> <p>2009-01-01</p> <p>This exploratory research examined the <span class="hlt">impact</span> of motivation to lead on college students' cocurricular <span class="hlt">involvement</span>. The question driving this research was: Is motivation to lead a predictor of cocurricular student <span class="hlt">involvement</span>? A 52-item questionnaire that included the Motivation to Lead Self-Report Questionnaire (Chan & Drasgow, 2001) was used to…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/18275319','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/18275319"><span id="translatedtitle">The <span class="hlt">impact</span> of banners on digital television: the role of program interactivity and product <span class="hlt">involvement</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Cauberghe, Verolien; De Pelsmacker, Patrick</p> <p>2008-02-01</p> <p>In a sample of 281 respondents, the effect of a noninteractive and a medium-interactive television program on recall and brand attitudes for low- and high-<span class="hlt">involvement</span> products advertised in banners during these programs was investigated. Medium-interactive programs resulted in less product and brand recall and recognition of brands in embedded banner advertisements, but generated more positive brand attitudes than noninteractive programs. These effects were more outspoken for a high-<span class="hlt">involvement</span> product than for a low-<span class="hlt">involvement</span> product. The <span class="hlt">impact</span> of perceived program interactivity on brand attitude is fully mediated program valence and <span class="hlt">involvement</span> for low-<span class="hlt">involvement</span> products, but not for high-<span class="hlt">involvement</span> products, for which perceived program interactivity had a direct <span class="hlt">impact</span> on brand attitude. PMID:18275319</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016EGUGA..18.4035M&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016EGUGA..18.4035M&link_type=ABSTRACT"><span id="translatedtitle"><span class="hlt">Impact</span> of multicomponent ionic transport on pH fronts propagation in saturated <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Muniruzzaman, Muhammad; Rolle, Massimo</p> <p>2016-04-01</p> <p>Multicomponent ionic interactions have been increasingly recognized as important factors for the displacement of charged species in <span class="hlt">porous</span> media under both diffusion- [1,2] and advection-dominated flow regimes [3,4]. In this study we investigate the propagation of pH fronts during multicomponent ionic transport in saturated <span class="hlt">porous</span> media under flow-through conditions. By performing laboratory bench-scale experiments combined with numerical modeling we show the important influence of Coulombic effects on proton transport in the presence of ionic admixtures. The experiments were performed in a quasi two-dimensional flow-through setup under steady-state flow and transport conditions. Dilute solutions of hydrochloric acid with MgCl2 (1:2 strong electrolyte) were used as tracer solutions to experimentally test the effect of electrochemical cross-coupling on the migration of diffusive/dispersive pH fronts. We focus on two experimental scenarios, with different composition of tracer solutions, causing remarkably different effects on the propagation of the acidic fronts with relative differences in the penetration depth of pH fronts of 36% between the two scenarios and of 25% and 15% for each scenario with respect to the transport of ions at liberated state (i.e., without considering the charge effects). Also significant differences in the dilution of the distinct ionic plumes, quantified using the flux-related dilution index at the laboratory bench scale [5], were measured at the outflow of the flow-through system. The dilution of the pH plumes also changed considerably (26% relative difference) in the two flow-through experiments only due to the different composition of the pore water solution and to the electrostatic coupling of the ions in the flow-through setups. Numerical transport simulations were performed to interpret the laboratory experiments. The simulations were based on a multicomponent ionic formulation accurately capturing the Coulombic interactions between</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3165047','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3165047"><span id="translatedtitle"><span class="hlt">IMPACT</span> OF NON-IDEAL SORPTION ON LOW-CONCENTRATION TAILING BEHAVIOR FOR ATRAZINE TRANSPORT IN TWO NATURAL <span class="hlt">POROUS</span> MEDIA</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Kempf, A.</p> <p>2011-01-01</p> <p>The <span class="hlt">impact</span> of nonideal sorption on atrazine transport was investigated for two sandy <span class="hlt">porous</span> media with 0.38 and 0.03% organic-carbon contents. In contrast to prior investigations, effluent atrazine concentrations were monitored over a range of five orders of magnitude to examine long-term elution behavior. As characterized by batch experiments, atrazine experienced nonlinear sorption for both media. The results of the column experiments showed that atrazine exhibited extensive elution tailing (delayed approach to relative concentration of zero). This non-ideal transport was more pronounced for the medium with higher organic-carbon content. A mathematical model incorporating nonlinear, rate-limited sorption/desorption described by a continuous distribution function was used to successfully simulate atrazine transport. PMID:19699507</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013AGUFM.H12E..08H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013AGUFM.H12E..08H"><span id="translatedtitle">Oxygen Transfer in a Fluctuating Capillary Fringe: <span class="hlt">Impact</span> of <span class="hlt">Porous</span> Medium Heterogeneity</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Haberer, C.; Rolle, M.; Cirpka, O. A.; Grathwohl, P.</p> <p>2013-12-01</p> <p>Mass transfer of oxygen from the atmosphere, across the capillary fringe, to anoxic groundwater is of primary importance for many biogeochemical processes affecting groundwater quality. The controlling mechanisms for oxygen transfer across the capillary fringe are the diffusive/dispersive transport as well as mass exchange between entrapped air and groundwater. In addition, the presence of physical heterogeneity in the <span class="hlt">porous</span> medium may strongly affect the oxygen fluxes. We performed quasi two-dimensional flow-through experiments at the laboratory bench-scale to study the effect of a coarse-material inclusion, located in proximity of the water table, on flow and oxygen transfer in the capillary fringe. Flow and transport were monitored under both steady-state and transient flow conditions, the latter obtained by fluctuating the water table. We visually inspected the complex flow field using a dye tracer solution, measured vertical oxygen profiles across the capillary fringe at high spatial resolution, and determined oxygen fluxes in the effluent of the flow-through chamber. Our results show that the coarse-material inclusion significantly affected oxygen transfer during the different phases of the experiments. At steady state, the oxygen flux across the unsaturated/saturated interface was considerably enhanced due to flow focusing in the fully water-saturated coarse lens. During drainage, the capillary barrier effect prevented water to drain from the fine material overlying the coarse lens. The entrapped oxygen-rich aqueous phase contributed to the total amount of oxygen supplied to the system when the water table was raised back to its initial level. In case of imbibition, also pronounced entrapment of air occurred in the coarse lens, causing oxygen to partition between the aqueous and gaseous phases. Thus, we found that oxygen transfer across the capillary fringe was significantly enhanced by the coarse-material inclusion due to flow focusing, the capillary</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014AGUFM.H33D0846S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014AGUFM.H33D0846S"><span id="translatedtitle">Modeling the <span class="hlt">Impact</span> of Deformation on Unstable Miscible Displacements in <span class="hlt">Porous</span> Media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Santillán, D.; Cueto-Felgueroso, L.</p> <p>2014-12-01</p> <p>Coupled flow and geomechanics is a critical research challenge in engineering and the geosciences. The simultaneous flow of two or more fluids with different densities or viscosities through deformable media is ubiquitous in environmental, industrial, and biological processes, including the removal of non-aqueous phase liquids from underground water bodies, the geological storage of CO2, and current challenges in energy technologies, such as enhanced geothermal systems, unconventional hydrocarbon resources or enhanced oil recovery techniques. Using numerical simulation, we study the interplay between viscous-driven flow instabilities (viscous fingering) and rock mechanics, and elucidate the structure of the displacement patterns as a function of viscosity contrast, injection rate and rock mechanical properties. Finally, we discuss the role of medium deformation on transport and mixing processes in <span class="hlt">porous</span> media.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015WRR....51.6739M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015WRR....51.6739M"><span id="translatedtitle"><span class="hlt">Impact</span> of multicomponent ionic transport on pH fronts propagation in saturated <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Muniruzzaman, Muhammad; Rolle, Massimo</p> <p>2015-08-01</p> <p>We investigate the propagation of pH fronts during multicomponent ionic transport in saturated <span class="hlt">porous</span> media under flow-through conditions. By performing laboratory bench-scale experiments combined with numerical modeling, we show the important influence of Coulombic effects on proton transport in the presence of ionic admixtures. The experiments were performed in a quasi two-dimensional flow-through setup under steady-state flow and transport conditions. Dilute solutions of hydrochloric acid with MgCl2 (1:2 strong electrolyte) were used as tracer solutions to experimentally test the effect of electrochemical cross coupling on the migration of diffusive/dispersive pH fronts. We focus on two experimental scenarios, with different composition of tracer solutions, causing remarkably different effects on the propagation of the acidic fronts with relative differences in the penetration depth of pH fronts of 36% between the two scenarios and of 25% and 15% for each scenario with respect to the transport of ions at liberated state (i.e., without considering the charge effects). Also differences in the dilution of the distinct ions plumes up to 28% and 45% in experiment 1 and 2, respectively, were measured at the outflow of the flow-through system. The dilution of the pH plumes also changed considerably (26% relative difference) in the two flow-through experiments only due to the different composition of the pore water solution and to the electrostatic coupling of the ions in the flow-through setups. Numerical transport simulations were performed to interpret the laboratory experiments. The simulations were based on a multicomponent ionic formulation accurately capturing the Coulombic interactions between the transported ions in the flow-through system. The results of purely forward simulations show a very good agreement with the high-resolution measurements performed at the outlet of the flow-through setup and confirms the importance of charge effects on pH transport in</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5013512','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5013512"><span id="translatedtitle">Psychological <span class="hlt">impact</span> and recovery after <span class="hlt">involvement</span> in a patient safety incident: a repeated measures analysis</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Van Gerven, Eva; Bruyneel, Luk; Panella, Massimiliano; Euwema, Martin; Sermeus, Walter; Vanhaecht, Kris</p> <p>2016-01-01</p> <p>Objective To examine individual, situational and organisational aspects that influence psychological <span class="hlt">impact</span> and recovery of a patient safety incident on physicians, nurses and midwives. Design Cross-sectional, retrospective surveys of physicians, midwives and nurses. Setting 33 Belgian hospitals. Participants 913 clinicians (186 physicians, 682 nurses, 45 midwives) <span class="hlt">involved</span> in a patient safety incident. Main outcome measures The <span class="hlt">Impact</span> of Event Scale was used to retrospectively measure psychological <span class="hlt">impact</span> of the safety incident at the time of the event and compare it with psychological <span class="hlt">impact</span> at the time of the survey. Results Individual, situational as well as organisational aspects influenced psychological <span class="hlt">impact</span> and recovery of a patient safety incident. Psychological <span class="hlt">impact</span> is higher when the degree of harm for the patient is more severe, when healthcare professionals feel responsible for the incident and among female healthcare professionals. <span class="hlt">Impact</span> of degree of harm differed across clinicians. Psychological <span class="hlt">impact</span> is lower among more optimistic professionals. Overall, <span class="hlt">impact</span> decreased significantly over time. This effect was more pronounced for women and for those who feel responsible for the incident. The longer ago the incident took place, the stronger <span class="hlt">impact</span> had decreased. Also, higher psychological <span class="hlt">impact</span> is related with the use of a more active coping and planning coping strategy, and is unrelated to support seeking coping strategies. Rendered support and a support culture reduce psychological <span class="hlt">impact</span>, whereas a blame culture increases psychological <span class="hlt">impact</span>. No associations were found with job experience and resilience of the health professional, the presence of a second victim support team or guideline and working in a learning culture. Conclusions Healthcare organisations should anticipate on providing their staff appropriate and timely support structures that are tailored to the healthcare professional <span class="hlt">involved</span> in the incident and to the specific</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015WRR....51.1710J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015WRR....51.1710J"><span id="translatedtitle"><span class="hlt">Impact</span> of interfacial tension on residual CO2 clusters in <span class="hlt">porous</span> sandstone</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Jiang, Fei; Tsuji, Takeshi</p> <p>2015-03-01</p> <p>We develop a numerical simulation that uses the lattice Boltzmann method to directly calculate the characteristics of residual nonwetting-phase clusters to quantify capillary trapping mechanisms in real sandstone. For this purpose, a digital-rock-pore model reconstructed from micro-CT-scanned images of Berea sandstone is filtered and segmented into a binary file. The residual-cluster distribution is generated following simulation of the drainage and imbibition processes. The characteristics of the residual cluster in terms of size distribution, major length, interfacial area, and sphericity are investigated under conditions of different interfacial tension (IFT). Our results indicate that high interfacial tension increases the residual saturation and leads to a large size distribution of residual clusters. However, low interfacial tension results in a larger interfacial area, which is beneficial for dissolution and reaction processes during geological carbon storage. Analysis of the force balance acting on the residual clusters demonstrates that trapping stability is higher in high interfacial tension case, and the interfacial tension should be a controlling factor for the trapping stability in addition to the pore geometry and connectivity. The proposed numerical method can handle the complex displacement of multicomponent systems in <span class="hlt">porous</span> media. By using this method, we can obtain residual-cluster distributions under different conditions for optimizing the storage capacity of carbon-storage projects.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26705829','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26705829"><span id="translatedtitle">Bacteria cell properties and grain size <span class="hlt">impact</span> on bacteria transport and deposition in <span class="hlt">porous</span> media.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Bai, Hongjuan; Cochet, Nelly; Pauss, André; Lamy, Edvina</p> <p>2016-03-01</p> <p>The simultaneous role of bacteria cell properties and <span class="hlt">porous</span> media grain size on bacteria transport and deposition behavior was investigated in this study. Transport column experiments and numerical HYDRUS-1D simulations of three bacteria with different cell properties (Escherichia coli, Klebsiella oxytoca, and Rhodococcus rhodochrous) were carried out on two sandy media with different grain sizes, under saturated steady state flow conditions. Each bacterium was characterized by cell size and shape, cell motility, electrophoretic mobility, zeta potential, hydrophobicity and potential of interaction with the sand surface. Cell characteristics affected bacteria transport behavior in the fine sand, but similar bacteria breakthroughs and retardation factors observed in the coarse sand, indicated that bacteria transport was more depended on grain size than on bacteria cell properties. Retention decreased with increasing hydrophobicity and increased with increasing electrophoretic mobility of bacteria for both sand. The increasing sand grain size resulted in a decrease of bacteria retention, except for the motile E. coli, indicating that retention of this strain was more dependent on cell motility than on the sand grain size. Bacteria deposition coefficients obtained from numerical simulations of the retention profiles indicated that straining was an important mechanism affecting bacteria deposition of E. coli and Klebsiella sp., in the fine sand, but the attachment had the same importance as straining for R. rhodochrous. The results obtained in the coarse sand did not permit to discriminate the predominant mechanism of bacteria deposition and the relative implication of bacteria cell properties of this process. PMID:26705829</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013duvi.workE...1S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013duvi.workE...1S"><span id="translatedtitle">Calibration of <span class="hlt">impact</span> ionization dust detectors with <span class="hlt">porous</span> or fluffy dust particles</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sterken, V. J.; Moragas-Klostermeyer, G.; Hillier, J. K.; Bugiel, S.; Srama, R.; Armes, S. P.; Fielding; L. A.; Lovett, J. R.; Grün, E.</p> <p>2013-07-01</p> <p><span class="hlt">Impact</span> ionization instruments like the ones flying on Cassini, Galileo, Helios and Ulysses have been calibrated using compact particles made of conductive materials like iron, or of minerals (like Olivine, Orthopyroxene, Magnetite, Pyrite) coated with a thin layer of conductive material. These calibrations were performed by shooting cosmic dust analogues with hypervelocity speeds from 1 to 80 km/s onto the flight spares of these instruments, using the Van de Graaff dust accelerator facility in Heidelberg. Here, we perform first measurements with Cassini CDA of the influence of the density of these dust particles on the resulting signal by, for a given <span class="hlt">impact</span> speed, comparing signals from micron-sized particles made of compact PPy-coated silica to those from (PPy-coated) hollow silica spheres. The degree of <span class="hlt">impact</span> ionization depends on the ratio of the densities of the target material and the impactor material and hence, different signals may result from <span class="hlt">impacts</span> with diffe! rent density or porosity.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014Tectp.634..171B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014Tectp.634..171B"><span id="translatedtitle">Scaling of sub-surface deformation in hypervelocity <span class="hlt">impact</span> experiments on <span class="hlt">porous</span> sandstone</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Buhl, Elmar; Poelchau, Michael; Dresen, Georg; Kenkmann, Thomas</p> <p>2014-11-01</p> <p>Two hypervelocity <span class="hlt">impact</span> experiments into dry sandstone (Seeberger Sandstein, ~ 23% porosity), performed under similar <span class="hlt">impact</span> conditions but with different projectile sizes, have been analyzed to investigate the size scaling of <span class="hlt">impact</span> damage. For one experiment a 2.5 mm steel projectile was <span class="hlt">impacted</span> at 4.8 km s- 1 onto a sandstone cube of 20 cm side length. For the other experiment a 10 mm iron meteorite projectile was <span class="hlt">impacted</span> at 4.6 km s- 1 onto a sandstone cube of 50 cm side length. The resulting kinetic <span class="hlt">impact</span> energies of 773 and 42,627 J led to crater cavities of 7600 and 612,000 mm3. Investigation of thin sections along cross-sections through both craters revealed that the same deformation microstructures are present in both experiments. The occurrence of different microstructural patterns was mapped and zones of characteristic deformation were defined. This mapping was used to calculate the volumes of material deformed by specific mechanisms. Comparing the results, normalized to the size of the projectile, showed that the sub-surface damage is very similar in size, volume and geometry for both experiments. Analysis of deformation bands found in both experiments regarding their long axes orientation showed that these features are developed under shear deformation. Particle size distributions (PSD), expressed as power-law fits, were measured to quantify the <span class="hlt">impact</span> damage. Comparison showed that the decay of the power-law exponents with increasing distance from the <span class="hlt">impact</span> point source is similar for both experiments. Reconstruction of the loading path allowed to infer the stresses under which distinct deformation microstructures are developed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016WRR....52.3637L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016WRR....52.3637L"><span id="translatedtitle"><span class="hlt">Impact</span> of kinetic mass transfer on free convection in a <span class="hlt">porous</span> medium</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lu, Chunhui; Shi, Liangsheng; Chen, Yiming; Xie, Yueqing; Simmons, Craig T.</p> <p>2016-05-01</p> <p>We investigate kinetic mass transfer effects on unstable density-driven flow and transport processes by numerical simulations of a modified Elder problem. The first-order dual-domain mass transfer model coupled with a variable-density-flow model is employed to describe transport behavior in <span class="hlt">porous</span> media. Results show that in comparison to the no-mass-transfer case, a higher degree of instability and more unstable system is developed in the mass transfer case due to the reduced effective porosity and correspondingly a larger Rayleigh number (assuming permeability is independent on the mobile porosity). Given a constant total porosity, the magnitude of capacity ratio (i.e., immobile porosity/mobile porosity) controls the macroscopic plume profile in the mobile domain, while the magnitude of mass transfer timescale (i.e., the reciprocal of the mass transfer rate coefficient) dominates its evolution rate. The magnitude of capacity ratio plays an important role on the mechanism driving the mass flux into the aquifer system. Specifically, for a small capacity ratio, solute loading is dominated by the density-driven transport, while with increasing capacity ratio local mass transfer dominated solute loading may occur at later times. At significantly large times, however, both mechanisms contribute comparably to solute loading. Sherwood Number could be a nonmonotonic function of mass transfer timescale due to complicated interactions of solute between source zone, mobile zone and immobile zone in the top boundary layer, resulting in accordingly a similar behavior of the total mass. The initial assessment provides important insights into unstable density-driven flow and transport in the presence of kinetic mass transfer.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19870014062','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19870014062"><span id="translatedtitle">Centrifuge <span class="hlt">impact</span> cratering experiments: Scaling laws for non-<span class="hlt">porous</span> targets</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Schmidt, Robert M.</p> <p>1987-01-01</p> <p>A geotechnical centrifuge was used to investigate large body <span class="hlt">impacts</span> onto planetary surfaces. At elevated gravity, it is possible to match various dimensionless similarity parameters which were shown to govern large scale <span class="hlt">impacts</span>. Observations of crater growth and target flow fields have provided detailed and critical tests of a complete and unified scaling theory for <span class="hlt">impact</span> cratering. Scaling estimates were determined for nonporous targets. Scaling estimates for large scale cratering in rock proposed previously by others have assumed that the crater radius is proportional to powers of the impactor energy and gravity, with no additional dependence on <span class="hlt">impact</span> velocity. The size scaling laws determined from ongoing centrifuge experiments differ from earlier ones in three respects. First, a distinct dependence of <span class="hlt">impact</span> velocity is recognized, even for constant impactor energy. Second, the present energy exponent for low porosity targets, like competent rock, is lower than earlier estimates. Third, the gravity exponent is recognized here as being related to both the energy and the velocity exponents.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=conventional+AND+theory&pg=7&id=ED552243','ERIC'); return false;" href="http://eric.ed.gov/?q=conventional+AND+theory&pg=7&id=ED552243"><span id="translatedtitle">Examining Parent <span class="hlt">Involvement</span> Activities in Two Immigrant-<span class="hlt">Impacted</span> Schools: A Comparative Case Study</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Marquez, Amalia</p> <p>2012-01-01</p> <p>K-12 schools with large immigrant populations face a myriad of challenges, including low academic achievement and high dropout rates of Latino students. Parental <span class="hlt">involvement</span> is a practical strategy in positively influencing student outcomes along the K-12 continuum. To this end, it is essential that immigrant <span class="hlt">impacted</span> schools work together with…</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_1");'>1</a></li> <li><a href="#" onclick='return showDiv("page_2");'>2</a></li> <li class="active"><span>3</span></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_3 --> <div id="page_4" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_2");'>2</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li class="active"><span>4</span></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="61"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=capital+AND+structure+AND+theory&pg=6&id=ED524414','ERIC'); return false;" href="http://eric.ed.gov/?q=capital+AND+structure+AND+theory&pg=6&id=ED524414"><span id="translatedtitle">Parent's Perception of Barriers that <span class="hlt">Impact</span> Parent <span class="hlt">Involvement</span> in Capital School District's Central Middle School</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Paylor, Raymond L.</p> <p>2011-01-01</p> <p>Interest in the perception of barriers that <span class="hlt">impact</span> parents' <span class="hlt">involvement</span> in Central Middle Schools' Parent Teacher Organization was a result of the low P T O membership rolls. Some educational research supports that socio-economic status, family values toward education, race, and relationship to students are factors that present barriers to parent…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title18-vol1/pdf/CFR-2011-title18-vol1-sec33-4.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title18-vol1/pdf/CFR-2011-title18-vol1-sec33-4.pdf"><span id="translatedtitle">18 CFR 33.4 - Additional information requirements for applications <span class="hlt">involving</span> vertical competitive <span class="hlt">impacts</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-04-01</p> <p>... 18 Conservation of Power and Water Resources 1 2011-04-01 2011-04-01 false Additional information requirements for applications <span class="hlt">involving</span> vertical competitive <span class="hlt">impacts</span>. 33.4 Section 33.4 Conservation of Power and Water Resources FEDERAL ENERGY REGULATORY COMMISSION, DEPARTMENT OF ENERGY REGULATIONS UNDER THE FEDERAL POWER ACT APPLICATIONS...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title18-vol1/pdf/CFR-2011-title18-vol1-sec33-3.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title18-vol1/pdf/CFR-2011-title18-vol1-sec33-3.pdf"><span id="translatedtitle">18 CFR 33.3 - Additional information requirements for applications <span class="hlt">involving</span> horizontal competitive <span class="hlt">impacts</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-04-01</p> <p>... the horizontal Competitive Analysis Screen. (3) The applicant may use a computer model to complete one... requirements for applications <span class="hlt">involving</span> horizontal competitive <span class="hlt">impacts</span>. 33.3 Section 33.3 Conservation of Power... FEDERAL POWER ACT APPLICATIONS UNDER FEDERAL POWER ACT SECTION 203 § 33.3 Additional...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title18-vol1/pdf/CFR-2010-title18-vol1-sec33-3.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title18-vol1/pdf/CFR-2010-title18-vol1-sec33-3.pdf"><span id="translatedtitle">18 CFR 33.3 - Additional information requirements for applications <span class="hlt">involving</span> horizontal competitive <span class="hlt">impacts</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-04-01</p> <p>... 18 Conservation of Power and Water Resources 1 2010-04-01 2010-04-01 false Additional information requirements for applications <span class="hlt">involving</span> horizontal competitive <span class="hlt">impacts</span>. 33.3 Section 33.3 Conservation of Power and Water Resources FEDERAL ENERGY REGULATORY COMMISSION, DEPARTMENT OF ENERGY REGULATIONS UNDER THE FEDERAL POWER ACT APPLICATIONS...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19870014065','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19870014065"><span id="translatedtitle">Centrifuge <span class="hlt">impact</span> cratering experiments: Scaling laws for non-<span class="hlt">porous</span> targets</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Schmidt, Robert M.</p> <p>1987-01-01</p> <p>This research is a continuation of an ongoing program whose objective is to perform experiments and to develop scaling relationships for large body <span class="hlt">impacts</span> onto planetary surfaces. The development of the centrifuge technique has been pioneered by the present investigator and is used to provide experimental data for actual target materials of interest. With both powder and gas guns mounted on a rotor arm, it is possible to match various dimensionless similarity parameters, which have been shown to govern the behavior of large scale <span class="hlt">impacts</span>. Current work is directed toward the determination of scaling estimates for nonporous targets. The results are presented in summary form.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/10129551','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10129551"><span id="translatedtitle">Proposed Tenaska Washington II Generation Project : Final Environmental <span class="hlt">Impact</span> Statement. Volume 2: Public <span class="hlt">Involvement</span>.</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>United States. Bonneville Power Administration.</p> <p>1994-01-01</p> <p>In regard to the proposed Tenaska Washington II Generation Project, the goal of the Bonneville Power Administration`s (BPA) Environmental <span class="hlt">Impact</span> Statement (EIS) public <span class="hlt">involvement</span> process is to determine the issues to be examined and pertinent analyses to be conducted and to solicit comments on the content and quality of information presented in the Draft Environmental <span class="hlt">Impact</span> Statement (DEIS). Comments and questions are solicited from the public and government agencies during the scoping process and during the comment period and public hearing on the DEIS, to find out what is of most concern to them. The end product of the public <span class="hlt">involvement</span> process is the Comment Report which follows in part of this volume on Public <span class="hlt">Involvement</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009M%26PS...44.1877J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009M%26PS...44.1877J"><span id="translatedtitle">The formation of the Baptistina family by catastrophic disruption: <span class="hlt">Porous</span> versus non-<span class="hlt">porous</span> parent body</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Jutzi, M.; Michel, P.; Benz, W.; Richardson, D. C.</p> <p>2009-01-01</p> <p>In this paper, we present numerical simulations aimed at reproducing the Baptistina family based on its properties estimated by observations. A previous study by Bottke et al. (2007) indicated that this family is probably at the origin of the K/T impactor, is linked to the CM meteorites and was produced by the disruption of a parent body 170 km in size due to the head-on <span class="hlt">impact</span> of a projectile 60 km in size at 3 km s-1. This estimate was based on simulations of fragmentation of non-<span class="hlt">porous</span> materials, while the family was assumed to be of C taxonomic type, which is generally interpreted as being formed from a <span class="hlt">porous</span> body. Using both a model of fragmentation of non-<span class="hlt">porous</span> materials, and a model that we developed recently for <span class="hlt">porous</span> ones, we performed numerical simulations of disruptions aimed at reproducing this family and at analyzing the differences in the outcome between those two models. Our results show that a reasonable match to the estimated size distribution of the real family is produced from the disruption of a <span class="hlt">porous</span> parent body by the head-on <span class="hlt">impact</span> of a projectile 54 km in size at 3 km s-1. Thus, our simulations with a model consistent with the assumed dark type of the family requires a smaller projectile than previously estimated, but the difference remains small enough to not affect the proposed scenario of this family history. We then find that the break-up of a <span class="hlt">porous</span> body leads to different outcomes than the disruption of a non-<span class="hlt">porous</span> one. The real properties of the Baptistina family still contain large uncertainties, and it remains possible that its formation did not <span class="hlt">involve</span> the proposed <span class="hlt">impact</span> conditions. However, the simulations presented here already show some range of outcomes and once the real properties are better constrained, it will be easy to check whether one of them provides a good match.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/21802252','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/21802252"><span id="translatedtitle">A preclinical study of stem subsidence and graft incorporation after femoral <span class="hlt">impaction</span> grafting using <span class="hlt">porous</span> hydroxyapatite as a bone graft extender.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Howie, Donald W; McGee, Margaret A; Callary, Stuart A; Carbone, Angelo; Stamenkov, Roumen B; Bruce, Warrick J; Findlay, David M</p> <p>2011-10-01</p> <p>This preclinical in vivo screening study compared bone graft incorporation and stem subsidence in cemented hemiarthroplasty after femoral <span class="hlt">impaction</span> bone grafting with either morselized allograft bone (n = 5, control group) or a 1:1 mix of allograft and <span class="hlt">porous</span> hydroxyapatite ceramics (HA) granules (n = 5, HA group). At 14 weeks, there was excellent bone graft incorporation by bone, and the stems were well fixed in both groups. The median subsidence at the cement-bone interface, measured using radiostereometric analysis, was 0.14 and 0.93 mm in the control and HA groups, respectively. The comparable histologic results between groups and good stem fixation in this study support the conduct of a larger scale investigation of the use of <span class="hlt">porous</span> HA in femoral <span class="hlt">impaction</span> bone grafting at revision hip arthroplasty. PMID:21802252</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4216291','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4216291"><span id="translatedtitle">The <span class="hlt">impact</span> of resident <span class="hlt">involvement</span> in minimally-invasive urologic oncology procedures</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Ruhotina, Nedim; Dagenais, Julien; Gandaglia, Giorgio; Sood, Akshay; Abdollah, Firas; Chang, Steven L.; Leow, Jeffrey J.; Olugbade, Kola; Rai, Arun; Sammon, Jesse D.; Schmid, Marianne; Varda, Briony; Zorn, Kevin C.; Menon, Mani; Kibel, Adam S.; Trinh, Quoc-Dien</p> <p>2014-01-01</p> <p>Introduction: Robotic and laparoscopic surgical training is an integral part of resident education in urology, yet the effect of resident <span class="hlt">involvement</span> on outcomes of minimally-invasive urologic procedures remains largely unknown. We assess the <span class="hlt">impact</span> of resident participation on surgical outcomes using a large multi-institutional prospective database. Methods: Relying on the American College of Surgeons National Surgical Quality Improvement Program (ACS-NSQIP) Participant User Files (2005–2011), we abstracted the 3 most frequently performed minimally-invasive urologic oncology procedures. These included radical prostatectomy, radical nephrectomy and partial nephrectomy. Multivariable logistic regression models were constructed to assess the <span class="hlt">impact</span> of trainee <span class="hlt">involvement</span> (PGY 1–2: junior, PGY 3–4: senior, PGY ≥5: chief) versus attending-only on operative time, length-of-stay, 30-day complication, reoperation and readmission rates. Results: A total of 5459 minimally-invasive radical prostatectomies, 1740 minimally-invasive radical nephrectomies and 786 minimally-invasive partial nephrectomies were performed during the study period, for which data on resident surgeon <span class="hlt">involvement</span> was available. In multivariable analyses, resident <span class="hlt">involvement</span> was not associated with increased odds of overall complications, reoperation, or readmission rates for minimally-invasive prostatectomy, radical and partial nephrectomy. However, operative time was prolonged when residents were <span class="hlt">involved</span> irrespective of the type of procedure. Length-of-stay was decreased with senior resident <span class="hlt">involvement</span> in minimally-invasive partial nephrectomies (odds ratio [OR] 0.49, p = 0.04) and prostatectomies (OR 0.68, p = 0.01). The major limitations of this study include its retrospective observational design, inability to adjust for the case complexity and surgeon/hospital characteristics, and the lack of information regarding the minimally-invasive approach utilized (whether robotic or laparoscopic</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011AIPC.1330...13S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011AIPC.1330...13S"><span id="translatedtitle">Perspectives on <span class="hlt">Porous</span> Media MR in Clinical MRI</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sigmund, E. E.</p> <p>2011-03-01</p> <p>Many goals and challenges of research in natural or synthetic <span class="hlt">porous</span> media are mirrored in quantitative medical MRI. This review will describe examples where MR techniques used in <span class="hlt">porous</span> media (particularly diffusion-weighted imaging (DWI)) are applied to physiological pathologies. Tissue microstructure is one area with great overlap with <span class="hlt">porous</span> media science. Diffusion-weighting (esp. in neurological tissue) has motivated models with explicit physical dimensions, statistical parameters, empirical descriptors, or hybrids thereof. Another clinically relevant microscopic process is active flow. Renal (kidney) tissue possesses significant active vascular / tubular transport that manifests as "pseudodiffusion." Cancerous lesions <span class="hlt">involve</span> anomalies in both structure and flow. The tools of magnetic resonance and their interpretation in <span class="hlt">porous</span> media has had great <span class="hlt">impact</span> on clinical MRI, and continued cross-fertilization of ideas can only enhance the progress of both fields.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4154307','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4154307"><span id="translatedtitle">Proteomic Analysis of Serum Opsonins <span class="hlt">Impacting</span> Biodistribution and Cellular Association of <span class="hlt">Porous</span> Silicon Microparticles</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Serda, Rita E.; Blanco, Elvin; Mack, Aaron; Stafford, Susan J.; Amra, Sarah; Li, Qingpo; van de Ven, Anne L.; Tanaka, Takemi; Torchilin, Vladimir P.; Wiktorowicz, John E.; Ferrari, Mauro</p> <p>2014-01-01</p> <p>Mass transport of drug delivery vehicles is guided by particle properties, such as shape, composition and surface chemistry, as well as biomolecules and serum proteins that adsorb to the particle surface. In an attempt to identify serum proteins influencing cellular associations and biodistribution of intravascularly injected particles, we used two dimensional gel electrophoresis and mass spectrometry to identify proteins eluted from the surface of cationic and anionic silicon microparticles. Cationic microparticles displayed a 25-fold greater abundance of Ig light chain variable region, fibrinogen, and complement component 1 compared to their anionic counterparts. The anionic-surface favored equal accumulation of microparticles in the liver and spleen, while cationic-surfaces favored preferential accumulation in the spleen. Immunohistochemistry supported macrophage internalization of both anionic and cationic silicon microparticles in the liver, as well as evidence of association of cationic microparticles with hepatic endothelial cells. Furthermore, scanning electron micrographs supported cellular competition for cationic microparticles by endothelial cells and macrophages. Despite high macrophage content in the lungs and tumor, microparticle uptake by these cells was minimal, supporting differences in the repertoire of surface receptors expressed by tissue-specific macrophages. In summary, particle surface chemistry drives selective binding of serum components <span class="hlt">impacting</span> cellular interactions and biodistribution. PMID:21303614</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2014PhDT........93H&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2014PhDT........93H&link_type=ABSTRACT"><span id="translatedtitle">Science homework with video directions for parents: The <span class="hlt">impact</span> on parental <span class="hlt">involvement</span> and academic achievement</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hooker, Kathy L.</p> <p></p> <p>The benefits of effective parental <span class="hlt">involvement</span> in education have been well documented and can be far reaching. When educators make an effort to <span class="hlt">involve</span> families, parental <span class="hlt">involvement</span> can be even more meaningful. Homework is a commonly practiced and accepted connection between school and home and affords parents many opportunities to interact with their children on educational endeavors. However, parental <span class="hlt">involvement</span> may be limited because educators do not reach out to parents, parents feel their children do not need their help, or parents are unfamiliar with the content and therefore unable to help. The purpose of this study was too develop and implement a tool to enhance parental <span class="hlt">involvement</span> and academic achievement of fourth grade science students. The tool used in this study was a weekly science video to be viewed by parents when it accompanied science homework assignments. To begin, the researcher created six science videos for parents to watch that supplemented weekly homework assignments. Consequently, the researcher set up treatment and comparison groups to test the effectiveness of the supplemental videos in terms of parental <span class="hlt">involvement</span> and academic achievement. A mixed methods approach was used to collect data from parents and students throughout the study. A combination of quantitative and qualitative data was collected throughout this study from both parents and students. Additionally, data was collected from a variety of sources including baseline, midpoint, and endpoint surveys; scores on homework assignments; and focus group interview sessions with parents and students. Data analysis revealed an overall positive <span class="hlt">impact</span> on parental <span class="hlt">involvement</span> and academic achievement when the videos were utilized.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26407854','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26407854"><span id="translatedtitle">A Research Framework for Understanding the Practical <span class="hlt">Impact</span> of Family <span class="hlt">Involvement</span> in the Juvenile Justice System: The Juvenile Justice Family <span class="hlt">Involvement</span> Model.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Walker, Sarah Cusworth; Bishop, Asia S; Pullmann, Michael D; Bauer, Grace</p> <p>2015-12-01</p> <p>Family <span class="hlt">involvement</span> is recognized as a critical element of service planning for children's mental health, welfare and education. For the juvenile justice system, however, parents' roles in this system are complex due to youths' legal rights, public safety, a process which can legally position parents as plaintiffs, and a historical legacy of blaming parents for youth indiscretions. Three recent national surveys of juvenile justice-<span class="hlt">involved</span> parents reveal that the current paradigm elicits feelings of stress, shame and distrust among parents and is likely leading to worse outcomes for youth, families and communities. While research on the <span class="hlt">impact</span> of family <span class="hlt">involvement</span> in the justice system is starting to emerge, the field currently has no organizing framework to guide a research agenda, interpret outcomes or translate findings for practitioners. We propose a research framework for family <span class="hlt">involvement</span> that is informed by a comprehensive review and content analysis of current, published arguments for family <span class="hlt">involvement</span> in juvenile justice along with a synthesis of family <span class="hlt">involvement</span> efforts in other child-serving systems. In this model, family <span class="hlt">involvement</span> is presented as an ascending, ordinal concept beginning with (1) exclusion, and moving toward climates characterized by (2) information-giving, (3) information-eliciting and (4) full, decision-making partnerships. Specific examples of how courts and facilities might align with these levels are described. Further, the model makes predictions for how <span class="hlt">involvement</span> will <span class="hlt">impact</span> outcomes at multiple levels with applications for other child-serving systems. PMID:26407854</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012AGUFMED41D0701W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012AGUFMED41D0701W"><span id="translatedtitle">Measuring the Broader <span class="hlt">Impact</span> of Direct Educator <span class="hlt">Involvement</span> in Scientific Research</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wold-Brennon, R.; Cooper, S. K.; Rabin, B.</p> <p>2012-12-01</p> <p>Just how effective is that educator who is a part of your Education and Outreach efforts? What can educators and partner scientists do to ensure Broader <span class="hlt">Impact</span> goals are being met? This poster examines initial data from middle school classrooms in Hawaii that measures student interest and performance when an educator is directly <span class="hlt">involved</span> in research projects. The project includes pre- and post-cruise student data and attempts to get at the all-important question of student <span class="hlt">impact</span>. Innovative use of media in communicating the excitement of deep sub-seafloor exploration is also highlighted. This project is a result of a collaboration between the Consortium for Ocean Leadership's Deep Earth Academy and the Center for Dark Energy Biosphere Investigations. It focuses on a series of innnovative expeditions to the seafloor at a number of subseafloor observatories installed by the JOIDES Resolution on the ridge flank of the Juan de Fuca plate.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/27609276','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27609276"><span id="translatedtitle">Thymus <span class="hlt">involvement</span> in myasthenia gravis: Epidemiological and clinical <span class="hlt">impacts</span> of different self-tolerance breakdown mechanisms.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Karni, Arnon; Asmail, Ali; Drory, Vivian E; Kolb, Hadar; Kesler, Anat</p> <p>2016-09-15</p> <p>The reasons for the abrogation of self-immunological tolerance in patients with myasthenia gravis (MG) may be different between those with concomitant thymic hyperplasia or thymoma, and those with no evidence of thymic <span class="hlt">involvement</span>. We conducted a retrospective observational case series study to investigate the epidemiology as well as the clinical, serologic, and electromyographic (EMG) characteristics of individuals diagnosed as having MG. We found that the average age at MG onset of patients with either thymic hyperplasia or thymoma was much younger (by ~20years) than that of MG patients without thymic <span class="hlt">involvement</span>. Thymic hyperplasia was more common in females than males. There were no differences in the rates of ocular MG vs. generalized MG among those three study groups. There were also no group differences in the rates of neuromuscular junction disfunction, as observed on EMG or by the results of serology tests for acetyl choline receptor antibody. Interestingly, only patients without thymic <span class="hlt">involvement</span> had other autoimmune diseases, and most of them were females. The patients with other coexisting autoimmune disease had a similar age at MG onset as the other patients with no thymic <span class="hlt">involvement</span>. These results shed light on the <span class="hlt">impact</span> of epidemiological and clinical factors that result from different mechanisms of self-immunological tolerance breakdown that occurs in MG. PMID:27609276</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4098614','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4098614"><span id="translatedtitle"><span class="hlt">Impact</span> of Heat and Mass Transfer during the Transport of Nitrogen in Coal <span class="hlt">Porous</span> Media on Coal Mine Fires</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Zhou, Fubao</p> <p>2014-01-01</p> <p>The application of liquid nitrogen injection is an important technique in the field of coal mine fire prevention. However, the mechanism of heat and mass transfer of cryogenic nitrogen in the goaf <span class="hlt">porous</span> medium has not been well accessed. Hence, the implementation of fire prevention engineering of liquid nitrogen roughly relied on an empirical view. According to the research gap in this respect, an experimental study on the heat and mass transfer of liquid nitrogen in coal <span class="hlt">porous</span> media was proposed. Overall, the main mechanism of liquid nitrogen fire prevention technology in the coal mine is the creation of an inert and cryogenic atmosphere. Cryogenic nitrogen gas vapor cloud, heavier than the air, would cause the phenomenon of “gravity settling” in <span class="hlt">porous</span> media firstly. The cryogen could be applicable to diverse types of fires, both in the openings and in the enclosures. Implementation of liquid nitrogen open-injection technique in Yangchangwan colliery achieved the goals of fire prevention and air-cooling. Meanwhile, this study can also provide an essential reference for the research on heat and mass transfer in <span class="hlt">porous</span> media in the field of thermal physics and engineering. PMID:25054173</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25054173','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25054173"><span id="translatedtitle"><span class="hlt">Impact</span> of heat and mass transfer during the transport of nitrogen in coal <span class="hlt">porous</span> media on coal mine fires.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Shi, Bobo; Zhou, Fubao</p> <p>2014-01-01</p> <p>The application of liquid nitrogen injection is an important technique in the field of coal mine fire prevention. However, the mechanism of heat and mass transfer of cryogenic nitrogen in the goaf <span class="hlt">porous</span> medium has not been well accessed. Hence, the implementation of fire prevention engineering of liquid nitrogen roughly relied on an empirical view. According to the research gap in this respect, an experimental study on the heat and mass transfer of liquid nitrogen in coal <span class="hlt">porous</span> media was proposed. Overall, the main mechanism of liquid nitrogen fire prevention technology in the coal mine is the creation of an inert and cryogenic atmosphere. Cryogenic nitrogen gas vapor cloud, heavier than the air, would cause the phenomenon of "gravity settling" in <span class="hlt">porous</span> media firstly. The cryogen could be applicable to diverse types of fires, both in the openings and in the enclosures. Implementation of liquid nitrogen open-injection technique in Yangchangwan colliery achieved the goals of fire prevention and air-cooling. Meanwhile, this study can also provide an essential reference for the research on heat and mass transfer in <span class="hlt">porous</span> media in the field of thermal physics and engineering. PMID:25054173</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/960957','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/960957"><span id="translatedtitle">Seismic stress mobilization of natural colloids in a <span class="hlt">porous</span> rock</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Roberts, Peter M; Abdel-fattah, Amr I</p> <p>2008-01-01</p> <p>Stress oscillations at 26 Hz enhanced the release of natural micro-particles (colloids) in a <span class="hlt">porous</span> rock sample. Micron-scale effects were induced by meter-scale wavelengths. The results are attributed to altering the release rate coefficient for colloids trapped in pores. The rate change did not depend on colloid size and thus is not due to altering colloid-pore-wall interactions. Enhanced colloid detachment from pore walls and flushing from dead-end pores are likely mechanisms. This phenomenon could <span class="hlt">impact</span> a broad range of physical sciences <span class="hlt">involving</span> colloid dynamics and <span class="hlt">porous</span> transport.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22390595','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22390595"><span id="translatedtitle">Rate coefficients for dissociative attachment and resonant electron-<span class="hlt">impact</span> dissociation <span class="hlt">involving</span> vibrationally excited O{sub 2} molecules</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Laporta, V.; Celiberto, R.; Tennyson, J.</p> <p>2014-12-09</p> <p>Rate coefficients for dissociative electron attachment and electron-<span class="hlt">impact</span> dissociation processes, <span class="hlt">involving</span> vibrationally excited molecular oxygen, are presented. Analytical fits of the calculated numerical data, useful in the applications, are also provided.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4090752','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4090752"><span id="translatedtitle">Redefining the <span class="hlt">impact</span> of nutrition on breast cancer incidence: is epigenetics <span class="hlt">involved</span>?</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Teegarden, Dorothy; Romieu, Isabelle; Lelièvre, Sophie A.</p> <p>2014-01-01</p> <p>Breast cancer incidence is rising worldwide with an increase in aggressive neoplasias in young women. Possible factors <span class="hlt">involved</span> include lifestyle changes, notably diet that is known to make an <span class="hlt">impact</span> on gene transcription. However, among dietary factors, there is sufficient support for only greater body weight and alcohol consumption whereas numerous studies revealing an <span class="hlt">impact</span> of specific diets and nutrients on breast cancer risk show conflicting results. Also, little information is available from middle- and low-income countries. The diversity of gene expression profiles found in breast cancers indicates that transcription control is critical for the outcome of the disease. This suggests the need for studies on nutrients that affect epigenetic mechanisms of transcription, such as DNA methylation and post-translational modifications of histones. In the present review, a new examination of the relationship between diet and breast cancer based on transcription control is proposed in light of epidemiological, animal and clinical studies. The mechanisms underlying the <span class="hlt">impact</span> of diets on breast cancer development and factors that impede reaching clear conclusions are discussed. Understanding the interaction between nutrition and epigenetics (gene expression control via chromatin structure) is critical in light of the influence of diet during early stages of mammary gland development on breast cancer risk, suggesting a persistent effect on gene expression as shown by the influence of certain nutrients on DNA methylation. Successful development of breast cancer prevention strategies will require appropriate models, identification of biological markers for rapid assessment of preventive interventions, and coordinated worldwide research to discern the effects of diet. PMID:22853843</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_2");'>2</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li class="active"><span>4</span></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_4 --> <div id="page_5" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li class="active"><span>5</span></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="81"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005JAP....97k3302C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005JAP....97k3302C"><span id="translatedtitle"><span class="hlt">Impact</span> of reductive N2/H2 plasma on <span class="hlt">porous</span> low-dielectric constant SiCOH thin films</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Cui, Hao; Carter, Richard J.; Moore, Darren L.; Peng, Hua-Gen; Gidley, David W.; Burke, Peter A.</p> <p>2005-06-01</p> <p><span class="hlt">Porous</span> low-dielectric constant (low-κ) SiCOH thin films deposited using a plasma-enhanced chemical-vapor deposition have been comprehensively characterized before and after exposure to a reactive-ion-etch-type plasma of N2 and H2 chemistry. The low-κ film studied in this work is a carbon-doped silicon oxide film with a dielectric constant (κ) of 2.5. Studies show that a top dense layer is formed as a result of significant surface film densification after exposure to N2/H2 plasma while the underlying bulk layer remains largely unchanged. The top dense layer is found to seal the <span class="hlt">porous</span> bulk SiCOH film. SiCOH films experienced significant thickness reduction, κ increase, and leakage current degradation after plasma exposure, accompanied by density increase, pore collapse, carbon depletion, and moisture content increase in the top dense layer. Both film densification and removal processes during N2/H2 plasma treatment were found to play important roles in the thickness reduction and κ increase of this <span class="hlt">porous</span> low-κ SiCOH film. A model based upon mutually limiting film densification and removal processes is proposed for the continuous thickness reduction during plasma exposure. A combination of surface film densification, thickness ratio increase of top dense layer to bulk layer, and moisture content increase results in the increase in κ value of this SiCOH film.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=sss&pg=2&id=ED517488','ERIC'); return false;" href="http://eric.ed.gov/?q=sss&pg=2&id=ED517488"><span id="translatedtitle">The Role of Student Support Services in Encouraging Student <span class="hlt">Involvement</span> and Its <span class="hlt">Impact</span> on Student Perceptions and Academic Experiences</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Kelley-Hall, Caren</p> <p>2010-01-01</p> <p>The purpose of this study was to explore the role of Student Support Services (SSS) in encouraging student <span class="hlt">involvement</span> and its <span class="hlt">impact</span> on student perceptions and academic experiences in three technical colleges in upstate South Carolina. By examining Alexander Astin's theory of student <span class="hlt">involvement</span> in the services provided by the program, a better…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3995719','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3995719"><span id="translatedtitle">Bacteria and Genes <span class="hlt">Involved</span> in Arsenic Speciation in Sediment <span class="hlt">Impacted</span> by Long-Term Gold Mining</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Costa, Patrícia S.; Scholte, Larissa L. S.; Reis, Mariana P.; Chaves, Anderson V.; Oliveira, Pollyanna L.; Itabayana, Luiza B.; Suhadolnik, Maria Luiza S.; Barbosa, Francisco A. R.; Chartone-Souza, Edmar; Nascimento, Andréa M. A.</p> <p>2014-01-01</p> <p>The bacterial community and genes <span class="hlt">involved</span> in geobiocycling of arsenic (As) from sediment <span class="hlt">impacted</span> by long-term gold mining were characterized through culture-based analysis of As-transforming bacteria and metagenomic studies of the arsC, arrA, and aioA genes. Sediment was collected from the historically gold mining <span class="hlt">impacted</span> Mina stream, located in one of the world’s largest mining regions known as the “Iron Quadrangle”. A total of 123 As-resistant bacteria were recovered from the enrichment cultures, which were phenotypically and genotypically characterized for As-transformation. A diverse As-resistant bacteria community was found through phylogenetic analyses of the 16S rRNA gene. Bacterial isolates were affiliated with Proteobacteria, Firmicutes, and Actinobacteria and were represented by 20 genera. Most were AsV-reducing (72%), whereas AsIII-oxidizing accounted for 20%. Bacteria harboring the arsC gene predominated (85%), followed by aioA (20%) and arrA (7%). Additionally, we identified two novel As-transforming genera, Thermomonas and Pannonibacter. Metagenomic analysis of arsC, aioA, and arrA sequences confirmed the presence of these genes, with arrA sequences being more closely related to uncultured organisms. Evolutionary analyses revealed high genetic similarity between some arsC and aioA sequences obtained from isolates and clone libraries, suggesting that those isolates may represent environmentally important bacteria acting in As speciation. In addition, our findings show that the diversity of arrA genes is wider than earlier described, once none arrA-OTUs were affiliated with known reference strains. Therefore, the molecular diversity of arrA genes is far from being fully explored deserving further attention. PMID:24755825</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26501893','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26501893"><span id="translatedtitle">Gatekeeping and its <span class="hlt">impact</span> on father <span class="hlt">involvement</span> among Black South Africans in rural KwaZulu-Natal.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Makusha, Tawanda; Richter, Linda</p> <p>2016-01-01</p> <p><span class="hlt">Involved</span> and caring fatherhood contributes to the health and wellbeing of children, women and men. The corollary is also true - men, women and children are affected when fathers are not <span class="hlt">involved</span> or supportive of their children. Many factors affect fathers' <span class="hlt">involvement</span>, including women's attitudes, the history and nature of the relationship between mother and father, and the cultural context. This study explores gatekeeping and its <span class="hlt">impact</span> on father <span class="hlt">involvement</span> among Black South Africans in rural KwaZulu-Natal. Among married couples, gatekeeping occurs with respect to childcare and housework through women's attempts to validate their maternal identity according to socially and culturally constructed gender roles. Among unmarried, non-resident parents, women control father-child contact and <span class="hlt">involvement</span>, with mothers and/or their families either facilitating or inhibiting father <span class="hlt">involvement</span>. In this context, we found that cultural gatekeeping had a huge <span class="hlt">impact</span> on father <span class="hlt">involvement</span>, with the non-payment of inhlawulo or lobola regulating father-child <span class="hlt">involvement</span>. In a country like South Africa, where there is high non-marital fertility and father-child non-residence, future research, parenting and family programmes should focus on strategies that encourage positive paternal <span class="hlt">involvement</span> as well as maternal and cultural support for father <span class="hlt">involvement</span>, regardless of parental relationship and residence status. PMID:26501893</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015NatSR...510900X','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015NatSR...510900X"><span id="translatedtitle">Systematic Analysis of the Genetic Variability That <span class="hlt">Impacts</span> SUMO Conjugation and Their <span class="hlt">Involvement</span> in Human Diseases</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Xu, Hao-Dong; Shi, Shao-Ping; Chen, Xiang; Qiu, Jian-Ding</p> <p>2015-07-01</p> <p>Protein function has been observed to rely on select essential sites instead of requiring all sites to be indispensable. Small ubiquitin-related modifier (SUMO) conjugation or sumoylation, which is a highly dynamic reversible process and its outcomes are extremely diverse, ranging from changes in localization to altered activity and, in some cases, stability of the modified, has shown to be especially valuable in cellular biology. Motivated by the significance of SUMO conjugation in biological processes, we report here on the first exploratory assessment whether sumoylation related genetic variability <span class="hlt">impacts</span> protein functions as well as the occurrence of diseases related to SUMO. Here, we defined the SUMOAMVR as sumoylation related amino acid variations that affect sumoylation sites or enzymes <span class="hlt">involved</span> in the process of connectivity, and categorized four types of potential SUMOAMVRs. We detected that 17.13% of amino acid variations are potential SUMOAMVRs and 4.83% of disease mutations could lead to SUMOAMVR with our system. More interestingly, the statistical analysis demonstrates that the amino acid variations that directly create new potential lysine sumoylation sites are more likely to cause diseases. It can be anticipated that our method can provide more instructive guidance to identify the mechanisms of genetic diseases.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4495600','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4495600"><span id="translatedtitle">Systematic Analysis of the Genetic Variability That <span class="hlt">Impacts</span> SUMO Conjugation and Their <span class="hlt">Involvement</span> in Human Diseases</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Xu, Hao-Dong; Shi, Shao-Ping; Chen, Xiang; Qiu, Jian-Ding</p> <p>2015-01-01</p> <p>Protein function has been observed to rely on select essential sites instead of requiring all sites to be indispensable. Small ubiquitin-related modifier (SUMO) conjugation or sumoylation, which is a highly dynamic reversible process and its outcomes are extremely diverse, ranging from changes in localization to altered activity and, in some cases, stability of the modified, has shown to be especially valuable in cellular biology. Motivated by the significance of SUMO conjugation in biological processes, we report here on the first exploratory assessment whether sumoylation related genetic variability <span class="hlt">impacts</span> protein functions as well as the occurrence of diseases related to SUMO. Here, we defined the SUMOAMVR as sumoylation related amino acid variations that affect sumoylation sites or enzymes <span class="hlt">involved</span> in the process of connectivity, and categorized four types of potential SUMOAMVRs. We detected that 17.13% of amino acid variations are potential SUMOAMVRs and 4.83% of disease mutations could lead to SUMOAMVR with our system. More interestingly, the statistical analysis demonstrates that the amino acid variations that directly create new potential lysine sumoylation sites are more likely to cause diseases. It can be anticipated that our method can provide more instructive guidance to identify the mechanisms of genetic diseases. PMID:26154679</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/27030954','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27030954"><span id="translatedtitle">Numerical modelling of biophysicochemical effects on multispecies reactive transport in <span class="hlt">porous</span> media <span class="hlt">involving</span> Pseudomonas putida for potential microbial enhanced oil recovery application.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Sivasankar, P; Rajesh Kanna, A; Suresh Kumar, G; Gummadi, Sathyanarayana N</p> <p>2016-07-01</p> <p>pH and resident time of injected slug plays a critical role in characterizing the reservoir for potential microbial enhanced oil recovery (MEOR) application. To investigate MEOR processes, a multispecies (microbes-nutrients) reactive transport model in <span class="hlt">porous</span> media was developed by coupling kinetic and transport model. The present work differs from earlier works by explicitly determining parametric values required for kinetic model by experimental investigations using Pseudomonas putida at different pH conditions and subsequently performing sensitivity analysis of pH, resident time and water saturation on concentrations of microbes, nutrients and biosurfactant within reservoir. The results suggest that nutrient utilization and biosurfactant production are found to be maximum at pH 8 and 7.5 respectively. It is also found that the sucrose and biosurfactant concentrations are highly sensitive to pH rather than reservoir microbial concentration, while at larger resident time and water saturation, the microbial and nutrient concentrations were lesser due to enhanced dispersion. PMID:27030954</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/872975','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/872975"><span id="translatedtitle">Rigid <span class="hlt">porous</span> filter</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Chiang, Ta-Kuan; Straub, Douglas L.; Dennis, Richard A.</p> <p>2000-01-01</p> <p>The present invention <span class="hlt">involves</span> a <span class="hlt">porous</span> rigid filter including a plurality of concentric filtration elements having internal flow passages and forming external flow passages there between. The present invention also <span class="hlt">involves</span> a pressure vessel containing the filter for the removal of particulates from high pressure particulate containing gases, and further <span class="hlt">involves</span> a method for using the filter to remove such particulates. The present filter has the advantage of requiring fewer filter elements due to the high surface area-to-volume ratio provided by the filter, requires a reduced pressure vessel size, and exhibits enhanced mechanical design properties, improved cleaning properties, configuration options, modularity and ease of fabrication.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=study+AND+home+AND+affect+AND+student&pg=4&id=ED525317','ERIC'); return false;" href="http://eric.ed.gov/?q=study+AND+home+AND+affect+AND+student&pg=4&id=ED525317"><span id="translatedtitle">The <span class="hlt">Impact</span> of a Family <span class="hlt">Involvement</span> Program on Achievement in First Grade Students</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Nagy, Kerri Ann</p> <p>2011-01-01</p> <p>Given expectations for higher standards teachers must find ways to improve family <span class="hlt">involvement</span> and build a community atmosphere within the classroom. The purpose of this mixed methods study was to examine the implementation of a family <span class="hlt">involvement</span> program into a first grade classroom. Epstein's six types of parent <span class="hlt">involvement</span> formed the theoretical…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=student+AND+academic+AND+performance+AND+parenting&pg=2&id=ED558305','ERIC'); return false;" href="http://eric.ed.gov/?q=student+AND+academic+AND+performance+AND+parenting&pg=2&id=ED558305"><span id="translatedtitle">The <span class="hlt">Impact</span> of Elementary Teachers' Perceptions and Practices to Promote Parental <span class="hlt">Involvement</span></span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Lattimore, Myra T.</p> <p>2013-01-01</p> <p>Parental <span class="hlt">involvement</span>, defined as the educational engagement of parents in activities such as <span class="hlt">involvement</span> in PTA, volunteering, and Science/Math night, promotes academic success. Lack of parental <span class="hlt">involvement</span> is associated with lower academic performance. The purpose of this correlational study was to determine the relationship between parent…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=Endpoint&pg=5&id=ED557531','ERIC'); return false;" href="http://eric.ed.gov/?q=Endpoint&pg=5&id=ED557531"><span id="translatedtitle">Science Homework with Video Directions for Parents: The <span class="hlt">Impact</span> on Parental <span class="hlt">Involvement</span> and Academic Achievement</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Hooker, Kathy L.</p> <p>2014-01-01</p> <p>The benefits of effective parental <span class="hlt">involvement</span> in education have been well documented and can be far reaching. When educators make an effort to <span class="hlt">involve</span> families, parental <span class="hlt">involvement</span> can be even more meaningful. Homework is a commonly practiced and accepted connection between school and home and affords parents many opportunities to interact with…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=leadership+AND+volunteer&pg=4&id=ED546183','ERIC'); return false;" href="http://eric.ed.gov/?q=leadership+AND+volunteer&pg=4&id=ED546183"><span id="translatedtitle">The <span class="hlt">Impact</span> of <span class="hlt">Involvement</span> in Mortar Board Senior Honor Society on Lifelong Views of Civic Engagement and Leadership</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Turner, Daniel James</p> <p>2012-01-01</p> <p>This study examines the <span class="hlt">impact</span> that <span class="hlt">involvement</span> in Mortar Board National Senior Honor Society has on lifelong views of civic engagement and leadership. Mortar Board Senior Honor Society is a collegiate honor society established in 1918 that recognizes students for their outstanding contributions to their college or university community in the…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=work+AND+life&pg=6&id=EJ1063771','ERIC'); return false;" href="http://eric.ed.gov/?q=work+AND+life&pg=6&id=EJ1063771"><span id="translatedtitle">Who Can Help Working Students? The <span class="hlt">Impact</span> of Graduate School <span class="hlt">Involvement</span> and Social Support on School-Work Facilitation</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Wyland, Rebecca L.; Winkel, Doan E.; Lester, Scott W.; Hanson-Rasmussen, Nancy</p> <p>2015-01-01</p> <p>A significant number of employees attend graduate school, and the <span class="hlt">impact</span> of the student role may be substantial and valuable to the work-life literature. In this study the authors examine whether psychological <span class="hlt">involvement</span> in graduate school increases school-work facilitation. Further, they suggest that employers and graduate schools can provide…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=69633&keyword=plasmid&actType=&TIMSType=+&TIMSSubTypeID=&DEID=&epaNumber=&ntisID=&archiveStatus=Both&ombCat=Any&dateBeginCreated=&dateEndCreated=&dateBeginPublishedPresented=&dateEndPublishedPresented=&dateBeginUpdated=&dateEndUpdated=&dateBeginCompleted=&dateEndCompleted=&personID=&role=Any&journalID=&publisherID=&sortBy=revisionDate&count=50&CFID=65358626&CFTOKEN=79880610','EPA-EIMS'); return false;" href="http://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=69633&keyword=plasmid&actType=&TIMSType=+&TIMSSubTypeID=&DEID=&epaNumber=&ntisID=&archiveStatus=Both&ombCat=Any&dateBeginCreated=&dateEndCreated=&dateBeginPublishedPresented=&dateEndPublishedPresented=&dateBeginUpdated=&dateEndUpdated=&dateBeginCompleted=&dateEndCompleted=&personID=&role=Any&journalID=&publisherID=&sortBy=revisionDate&count=50&CFID=65358626&CFTOKEN=79880610"><span id="translatedtitle">BIODEGRADATION DURING CONTAMINANT TRANSPORT IN <span class="hlt">POROUS</span> MEDIA. 4. <span class="hlt">IMPACT</span> OF MICROBIAL LAG AND BACTERIAL CELL GROWTH. (R825415)</span></a></p> <p><a target="_blank" href="http://oaspub.epa.gov/eims/query.page">EPA Science Inventory</a></p> <p></p> <p></p> <p><h2>Abstract</h2><p>Miscible-displacement experiments were conducted to examine the <span class="hlt">impact</span> of microbial lag and bacterial cell growth on the transport of salicylate, a model hydrocarbon compound. The <span class="hlt">impacts</span> of these processes were examined separately, as well as jointly, to dete...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25325703','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25325703"><span id="translatedtitle"><span class="hlt">Impact</span> of redox-active polymer molecular weight on the electrochemical properties and transport across <span class="hlt">porous</span> separators in nonaqueous solvents.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Nagarjuna, Gavvalapalli; Hui, Jingshu; Cheng, Kevin J; Lichtenstein, Timothy; Shen, Mei; Moore, Jeffrey S; Rodríguez-López, Joaquín</p> <p>2014-11-19</p> <p>Enhancing the ionic conductivity across the electrolyte separator in nonaqueous redox flow batteries (NRFBs) is essential for improving their performance and enabling their widespread utilization. Separating redox-active species by size exclusion without greatly impeding the transport of supporting electrolyte is a potentially powerful alternative to the use of poorly performing ion-exchange membranes. However, this strategy has not been explored possibly due to the lack of suitable redox-active species that are easily varied in size, remain highly soluble, and exhibit good electrochemical properties. Here we report the synthesis, electrochemical characterization, and transport properties of redox-active poly(vinylbenzyl ethylviologen) (RAPs) with molecular weights between 21 and 318 kDa. The RAPs reported here show very good solubility (up to at least 2.0 M) in acetonitrile and propylene carbonate. Ultramicroelectrode voltammetry reveals facile electron transfer with E1/2 ∼ -0.7 V vs Ag/Ag(+)(0.1 M) for the viologen 2+/+ reduction at concentrations as high as 1.0 M in acetonitrile. Controlled potential bulk electrolysis indicates that 94-99% of the nominal charge on different RAPs is accessible and that the electrolysis products are stable upon cycling. The dependence of the diffusion coefficient on molecular weight suggests the adequacy of the Stokes-Einstein formalism to describe RAPs. The size-selective transport properties of LiBF4 and RAPs across commercial off-the-shelf (COTS) separators such as Celgard 2400 and Celgard 2325 were tested. COTS <span class="hlt">porous</span> separators show ca. 70 times higher selectivity for charge balancing ions (Li(+)BF4(-)) compared to high molecular weight RAPs. RAPs rejection across these separators showed a strong dependence on polymer molecular weight as well as the pore size; the rejection increased with both increasing polymer molecular weight and reduction in pore size. Significant rejection was observed even for rpoly/rpore (polymer</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015WRR....51.9094G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015WRR....51.9094G"><span id="translatedtitle">The <span class="hlt">impact</span> of pore structure and surface roughness on capillary trapping for 2-D and 3-D <span class="hlt">porous</span> media: Comparison with percolation theory</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Geistlinger, Helmut; Ataei-Dadavi, Iman; Mohammadian, Sadjad; Vogel, Hans-Jörg</p> <p>2015-11-01</p> <p>We study the <span class="hlt">impact</span> of pore structure and surface roughness on capillary trapping of nonwetting gas phase during imbibition with water for capillary numbers between 10-7 and 5 × 10-5, within glass beads, natural sands, glass beads monolayers, and 2-D micromodels. The materials exhibit different roughness of the pore-solid interface. We found that glass beads and natural sands, which exhibit nearly the same grain size distribution, pore size distribution, and connectivity, showed a significant difference of the trapped gas phase of about 15%. This difference can be explained by the microstructure of the pore-solid interface. Based on the visualization of the trapping dynamics within glass beads monolayers and 2-D micromodels, we could show that bypass trapping controls the trapping process in glass beads monolayers, while snap-off trapping controls the trapping process in 2-D micromodels. We conclude that these different trapping processes are the reason for the different trapping efficiency, when comparing glass beads packs with natural sand packs. Moreover, for small capillary numbers of 10-6, we found that the cluster size distribution of trapped gas clusters of all 2-D and 3-D <span class="hlt">porous</span> media can be described by a universal power law behavior predicted from percolation theory. This cannot be expected a priori for 2-D <span class="hlt">porous</span> media, because bicontinuity of the two bulk phases is violated. Obviously, bicontinuity holds for the thin-film water phase and the bulk gas phase. The snap-off trapping process leads to ordinary bond percolation in front of the advancing bulk water phase and is the reason for the observed universal power law behavior in 2-D micromodels with rough surfaces.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2010-11-15/pdf/2010-28689.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2010-11-15/pdf/2010-28689.pdf"><span id="translatedtitle">75 FR 69630 - <span class="hlt">Impact</span> of Implementation of the Chemical Weapons Convention on Commercial Activities <span class="hlt">Involving</span>...</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collection.action?collectionCode=FR">Federal Register 2010, 2011, 2012, 2013, 2014</a></p> <p></p> <p>2010-11-15</p> <p>... Bureau of Industry and Security <span class="hlt">Impact</span> of Implementation of the Chemical Weapons Convention on Commercial..., Through Calendar Year 2010 AGENCY: Bureau of Industry and Security, Commerce. ACTION: Notice of inquiry. SUMMARY: The Bureau of Industry and Security (BIS) is seeking public comments on the <span class="hlt">impact</span>...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=transportation+AND+survey&pg=6&id=ED519258','ERIC'); return false;" href="http://eric.ed.gov/?q=transportation+AND+survey&pg=6&id=ED519258"><span id="translatedtitle">Factors that <span class="hlt">Impact</span> West Virginia Head Start Parental <span class="hlt">Involvement</span> in Early Literacy</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Clausell, Arlene Midget</p> <p>2010-01-01</p> <p>The research problem is: Many parents are not <span class="hlt">involved</span> in their children's early literacy education. Some Head Start parents experience issues that keep them from teaching their children early literacy skills. The research questions were: What are the factors for parental <span class="hlt">involvement</span> in the support of early literacy skill development for their…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/ED481644.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/ED481644.pdf"><span id="translatedtitle">Bringing the Mountain to Mohammed: Parent <span class="hlt">Involvement</span> in Migrant-<span class="hlt">Impacted</span> Schools.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Lopez, Gerardo R.</p> <p></p> <p>Migrant students have a host of factors working against their chances of success in school. In the search for ways to counter these risk factors, educators have recognized the value of parent <span class="hlt">involvement</span>. In addition to its effects on student learning and achievement, parent <span class="hlt">involvement</span> also strengthens school accountability and gives historically…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=study+AND+crayons&pg=2&id=ED160231','ERIC'); return false;" href="http://eric.ed.gov/?q=study+AND+crayons&pg=2&id=ED160231"><span id="translatedtitle">A Study of the <span class="hlt">Impact</span> of Specially Designed Settings on Children's <span class="hlt">Involvement</span>: A Pilot Project.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Berman, Louise M.; And Others</p> <p></p> <p>The purpose of this pilot project was to determine whether <span class="hlt">involvement</span>, as described by verbal and nonverbal indicators, increased as children worked at language arts learning centers characterized by increasing possibilities for <span class="hlt">involvement</span>. Twelve first graders, randomly selected from an open space school, were each observed at three learning…</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li class="active"><span>5</span></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_5 --> <div id="page_6" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li class="active"><span>6</span></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="101"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4776699','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4776699"><span id="translatedtitle"><span class="hlt">Impact</span> on the individual: what do patients and carers gain, lose and expect from being <span class="hlt">involved</span> in research?</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Ashcroft, Joanne; Wykes, Til; Taylor, Joseph; Crowther, Adam; Szmukler, George</p> <p>2016-01-01</p> <p>Abstract Background: Study feasibility and deliverability can benefit from <span class="hlt">involving</span> patients and carers in the research process, known as patient and public <span class="hlt">involvement</span> (PPI). There is less evidence on the experiences of patients and carers themselves and we require more information across a range of studies, health conditions and research stages. Aims: This study explored how patients and carers in eight diagnostic research specialties have been <span class="hlt">involved</span> in research, their motivations and the <span class="hlt">impact</span> <span class="hlt">involvement</span> had on them. Method: 143 patients and carers across the Clinical Research Network (CRN) responded to an online semi-structured questionnaire (developed using participatory methodology). Quantitative and qualitative data were analysed. Results: A range of benefits were reported, including providing a life focus and an improved relationship with illness. Less positive experiences regarding time and money and lack of acknowledgement were also reported, along with suggestions for improvement. Conclusions: PPI confers many benefits on patients and carers which could increase PPI recruitment if made explicit. More <span class="hlt">involvement</span> in study recruitment and dissemination would increase the effectiveness of PPI input. <span class="hlt">Involving</span> a more varied socioeconomic demographic and at an earlier stage is vital. Financial support for lower earners and greater feedback following <span class="hlt">involvement</span> should also be explored. PMID:26733079</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016Icar..268..102M&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016Icar..268..102M&link_type=ABSTRACT"><span id="translatedtitle">Survivability of copper projectiles during hypervelocity <span class="hlt">impacts</span> in <span class="hlt">porous</span> ice: A laboratory investigation of the survivability of projectiles <span class="hlt">impacting</span> comets or other bodies</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>McDermott, K. H.; Price, M. C.; Cole, M.; Burchell, M. J.</p> <p>2016-04-01</p> <p>During hypervelocity <span class="hlt">impact</span> (>a few km s-1) the resulting cratering and/or disruption of the target body often outweighs interest on the outcome of the projectile material, with the majority of projectiles assumed to be vaporised. However, on Earth, fragments, often metallic, have been recovered from <span class="hlt">impact</span> sites, meaning that metallic projectile fragments may survive a hypervelocity <span class="hlt">impact</span> and still exist within the wall, floor and/or ejecta of the <span class="hlt">impact</span> crater post-<span class="hlt">impact</span>. The discovery of the remnant impactor composition within the craters of asteroids, planets and comets could provide further information regarding the <span class="hlt">impact</span> history of a body. Accordingly, we study in the laboratory the survivability of 1 and 2 mm diameter copper projectiles fired onto ice at speeds between 1.00 and 7.05 km s-1. The projectile was recovered intact at speeds up to 1.50 km s-1, with no ductile deformation, but some surface pitting was observed. At 2.39 km s-1, the projectile showed increasing ductile deformation and broke into two parts. Above velocities of 2.60 km s-1 increasing numbers of projectile fragments were identified post <span class="hlt">impact</span>, with the mean size of the fragments decreasing with increasing <span class="hlt">impact</span> velocity. The decrease in size also corresponds with an increase in the number of projectile fragments recovered, as with increasing shock pressure the projectile material is more intensely disrupted, producing smaller and more numerous fragments. The damage to the projectile is divided into four classes with increasing speed and shock pressure: (1) minimal damage, (2) ductile deformation, start of break up, (3) increasing fragmentation, and (4) complete fragmentation. The implications of such behaviour is considered for specific examples of <span class="hlt">impacts</span> of metallic impactors onto Solar System bodies, including LCROSS <span class="hlt">impacting</span> the Moon, iron meteorites onto Mars and NASA's "Deep <span class="hlt">Impact</span>" mission where a spacecraft <span class="hlt">impacted</span> a comet.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4591048','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4591048"><span id="translatedtitle">Positive Social <span class="hlt">Impacts</span> Related to Participation in an HIV Prevention Trial <span class="hlt">Involving</span> People Who Inject Drugs</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Sugarman, Jeremy; Stalter, Randy; Bokoch, Kevin; Liu, Ting-Yuan; Donnell, Deborah</p> <p>2015-01-01</p> <p>Although attention has focused on whether participants actually derive better medical outcomes in research, the social benefits experienced in research have not been systematically examined. At regular follow-up visits during a phase III randomized trial assessing the safety and efficacy of a long-term versus a short-term drug treatment intervention in decreasing HIV transmission and mortality conducted in China and Thailand, participants identified research-related negative and positive social <span class="hlt">impacts</span> (PSIs). Open-ended PSI responses were coded using standard qualitative techniques. Among 1025 participants, only 4 reported a negative social <span class="hlt">impact</span>; however, 77% reported at least one PSI over the 104 week follow-up period. Given the high prevalence of PSIs we observed, future research should embed assessments of negative and positive social <span class="hlt">impacts</span> experienced by participants in research not only to ensure their well-being, but also to inform policy and conceptual work related to research ethics. PMID:26247080</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4235963','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4235963"><span id="translatedtitle">The Differential <span class="hlt">Impact</span> of Early Father and Mother <span class="hlt">Involvement</span> on Later Student Achievement</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>McBride, Brent A.; Dyer, W. Justin; Liu, Ying; Brown, Geoffrey L.; Hong, Sungjin</p> <p>2014-01-01</p> <p>The purpose of this exploratory study was to examine the direct and indirect effects of early parenting on later parental school <span class="hlt">involvement</span> and student achievement. The sample, pulled from the first and second waves of the Panel Study of Income Dynamics – Child Development Supplement data set, consisted of 390 children ages 2–5 at time 1 and their families. Fathers’ and mothers’ participation in five dimensions of early parenting behaviors were assessed at time 1, while later parental school <span class="hlt">involvement</span> and student achievement were assessed at time 2. Although early paternal and maternal parenting behaviors were not directly related to later student achievement, differences were revealed in the pattern of relationships between early parenting and later parental school <span class="hlt">involvement</span> for fathers and mothers. In addition, fathers’ later school <span class="hlt">involvement</span> was found to be negatively related to student achievement while maternal school <span class="hlt">involvement</span> was found to be positively related to student achievement. These findings provide partial support for the hypothesized differential relationship between fathers’ and mothers’ early parenting and later student achievement. PMID:25414521</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015AGUFMNS31A1954T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015AGUFMNS31A1954T"><span id="translatedtitle">A feasible research of rock porosity and water saturation <span class="hlt">impact</span> on audio-magnetotelluric propagation in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tian, Z.; Liu, J.</p> <p>2015-12-01</p> <p>Abstract: Although various factors have <span class="hlt">impact</span> on the resistivity of subsurface rock formation, in depth range of general electrical prospecting, the conductive actions of rocks are basically realized relying on the aqueous solutions filled in the pores. Therefore, quantitatively studying the <span class="hlt">impact</span> of the water level on rock resistivity is important to analyze and classify strata, investigate the underground structures. In this research, we proposed a feasible research on building electric property rock formation models with different porosity and water saturation based on theories of two-phase media. The propagation of audio-magnetotelluric (AMT) waves is simulated by using finite-difference (FD) scheme, and theoretic resistivity distribution is calculated on account of the response of AMT. According to a sequence of synthetic examples, through comparing and analyzing the simulated results with various porosity and water saturation respectively, we discuss the <span class="hlt">impact</span> on layers resistivity while porosity and water saturation of rock stratum are changing. The results shows the extent that the mentioned factors can have <span class="hlt">impact</span> on the propagation of AMT waves. Key words: audio-magnetotelluric modeling, two-phase media, porosity, water saturation, finite-difference</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4420640','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4420640"><span id="translatedtitle">Family <span class="hlt">involvement</span> in music <span class="hlt">impacts</span> participation of children with cochlear implants in music education and music activities</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Driscoll, Virginia; Gfeller, Kate; Tan, Xueli; See, Rachel L.; Cheng, Hsin-Yi; Kanemitsu, Mikiko</p> <p>2014-01-01</p> <p>Objective Children with cochlear implants (CIs) participate in musical activities in school and daily lives. Considerable variability exists regarding the amount of music <span class="hlt">involvement</span> and enjoyment. Using the Music Engagement Questionnaire-Preschool/Elementary (MEQ-P/E), we wanted to determine patterns of musical participation and the <span class="hlt">impact</span> of familial factors on engagement. Methods Parents of 32 children with CIs (16 preschool, 16 elementary) completed a questionnaire regarding the musical <span class="hlt">involvement</span> of their child with an implant and a normal-hearing (NH) sibling (if one existed). We compared CI children's <span class="hlt">involvement</span> to that of their NH siblings as well as across groups of children with and without CIs. Correlations between parent ratings of music importance, demographic factors, and <span class="hlt">involvement</span> of CI and NH children were conducted within and across groups. Results No significant differences were found between children with CIs and NH siblings, meaning children from the same family showed similar levels of musical <span class="hlt">involvement</span>. When compared at the same developmental stage, no significant differences were found between preschool children with and without CIs. Parents who rated the importance of music as “low” or “middle” had children (NH and CI) who were less <span class="hlt">involved</span> in music activities. Children whose parents rated music importance as “high” were <span class="hlt">involved</span> in monthly to weekly music activities with 81.25% reporting daily music listening. Conclusion Despite a less-than-ideal auditory signal for music, preschool and school-aged CI children enjoy and are <span class="hlt">involved</span> in musical experiences. Families who enjoy and spend a greater amount of time <span class="hlt">involved</span> in music tend to have children who also engage more actively in music. PMID:25431978</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25431978','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25431978"><span id="translatedtitle">Family <span class="hlt">involvement</span> in music <span class="hlt">impacts</span> participation of children with cochlear implants in music education and music activities.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Driscoll, Virginia; Gfeller, Kate; Tan, Xueli; See, Rachel L; Cheng, Hsin-Yi; Kanemitsu, Mikiko</p> <p>2015-05-01</p> <p>Objective Children with cochlear implants (CIs) participate in musical activities in school and daily lives. Considerable variability exists regarding the amount of music <span class="hlt">involvement</span> and enjoyment. Using the Music Engagement Questionnaire-Preschool/Elementary (MEQ-P/E), we wanted to determine patterns of musical participation and the <span class="hlt">impact</span> of familial factors on engagement. Methods Parents of 32 children with CIs (16 preschool and 16 elementary) completed a questionnaire regarding the musical <span class="hlt">involvement</span> of their child with an implant and a normal-hearing (NH) sibling (if one existed). We compared CI children's <span class="hlt">involvement</span> to that of their NH siblings as well as across groups of children with and without CIs. Correlations between parent ratings of music importance, demographic factors, and <span class="hlt">involvement</span> of CI and NH children were conducted within and across groups. Results No significant differences were found between children with CIs and NH siblings, meaning children from the same family showed similar levels of musical <span class="hlt">involvement</span>. When compared at the same developmental stage, no significant differences were found between preschool children with and without CIs. Parents who rated the importance of music as 'low' or 'middle' had children (NH and CI) who were less <span class="hlt">involved</span> in music activities. Children whose parents rated music importance as 'high' were <span class="hlt">involved</span> in monthly to weekly music activities with 81.25% reporting daily music listening. Conclusion Despite a less-than-ideal auditory signal for music, preschool and school-aged CI children enjoy and are <span class="hlt">involved</span> in musical experiences. Families who enjoy and spend a greater amount of time <span class="hlt">involved</span> in music tend to have children who also engage more actively in music. PMID:25431978</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3755281','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3755281"><span id="translatedtitle"><span class="hlt">Porous</span> Carbon Nanoparticle Networks with Tunable Absorbability</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Dai, Wei; Kim, Seong Jin; Seong, Won-Kyeong; Kim, Sang Hoon; Lee, Kwang-Ryeol; Kim, Ho-Young; Moon, Myoung-Woon</p> <p>2013-01-01</p> <p><span class="hlt">Porous</span> carbon materials with high specific surface areas and superhydrophobicity have attracted much research interest due to their potential application in the areas of water filtration, water/oil separation, and oil-spill cleanup. Most reported superhydrophobic <span class="hlt">porous</span> carbon materials are fabricated by complex processes <span class="hlt">involving</span> the use of catalysts and high temperatures but with low throughput. Here, we present a facile single-step method for fabricating <span class="hlt">porous</span> carbon nanoparticle (CNP) networks with selective absorbability for water and oils via the glow discharge of hydrocarbon plasma without a catalyst at room temperature. <span class="hlt">Porous</span> CNP networks were grown by the continuous deposition of CNPs at a relatively high deposition pressure. By varying the fluorine content, the <span class="hlt">porous</span> CNP networks exhibited tunable repellence against liquids with various degrees of surface tension. These <span class="hlt">porous</span> CNP networks could be applied for the separation of not only water/oil mixtures but also mixtures of liquids with different surface tension levels. PMID:23982181</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/EJ901305.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/EJ901305.pdf"><span id="translatedtitle">Determining the <span class="hlt">Impact</span> of Block Scheduling on Leadership <span class="hlt">Involvement</span> in the FFA</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Dunigan, Anne H.; Hoover, Tracy S.</p> <p>2007-01-01</p> <p>Block scheduling was established in response to educational reform measures and is the restructuring of the school day in longer class increments with fewer number of classes per day. The FFA, an intra-curricular component of the agricultural education, provides leadership opportunities and <span class="hlt">involvement</span> within the classroom setting. This study…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=Liu%2c+AND+W.&pg=5&id=EJ835041','ERIC'); return false;" href="http://eric.ed.gov/?q=Liu%2c+AND+W.&pg=5&id=EJ835041"><span id="translatedtitle">The Differential <span class="hlt">Impact</span> of Early Father and Mother <span class="hlt">Involvement</span> on Later Student Achievement</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>McBride, Brent A.; Dyer, W. Justin; Liu, Ying; Brown, Geoffrey L.; Hong, Sungjin</p> <p>2009-01-01</p> <p>The purpose of this exploratory study was to examine the direct and indirect effects of early parenting on later parental school <span class="hlt">involvement</span> and student achievement. The sample, pulled from the 1st and 2nd waves of the Child Development Supplement data set of the Panel Study of Income Dynamics, consisted of 390 children age 2-5 at Time 1 and their…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=marital+AND+job+AND+satisfaction&pg=3&id=EJ080357','ERIC'); return false;" href="http://eric.ed.gov/?q=marital+AND+job+AND+satisfaction&pg=3&id=EJ080357"><span id="translatedtitle">Exploring the <span class="hlt">Impact</span> of Work Satisfaction and <span class="hlt">Involvement</span> on Marital Interaction When Both Partners are Employed</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Ridley, Carl A.</p> <p>1973-01-01</p> <p>The two major conclusions of this study were: (1) teachers and their husbands follow different patterns concerning the job satisfaction-marital adjustment relationship, and (2) teachers and their husbands were more than moderately successful at preventing their job <span class="hlt">involvement</span> from interfering with their marital adjustment. (Author)</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=child+AND+stars&pg=3&id=ED562888','ERIC'); return false;" href="http://eric.ed.gov/?q=child+AND+stars&pg=3&id=ED562888"><span id="translatedtitle">Parent <span class="hlt">Involvement</span> and the <span class="hlt">Impact</span> on Student Achievement in Grades 2-5</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Thurber, Yvonne Marie</p> <p>2013-01-01</p> <p>This quantitative research study examined the relationship between student achievement in reading and mathematics on the STAR (Standardized Test for the Assessment of Reading and Mathematics) and parent <span class="hlt">involvement</span> in specific character development activities. The research design was quantitative in nature and conducted in two similar elementary…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=%22College+students%22&id=EJ1061287','ERIC'); return false;" href="http://eric.ed.gov/?q=%22College+students%22&id=EJ1061287"><span id="translatedtitle">The <span class="hlt">Impact</span> of Racial Socialization on the Academic Performance and Prosocial <span class="hlt">Involvement</span> of Black Emerging Adults</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>White-Johnson, Rhonda L.</p> <p>2015-01-01</p> <p>Despite evidence linking racial socialization processes to the functioning of Black youth, the effect of these parenting practices among Black college students is less clear. This study examined the relationship among racial socialization messages, academic performance, and prosocial <span class="hlt">involvement</span> for 295 Black college students. Results revealed…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=japanese&pg=4&id=EJ948410','ERIC'); return false;" href="http://eric.ed.gov/?q=japanese&pg=4&id=EJ948410"><span id="translatedtitle">The <span class="hlt">Impact</span> of Japanese Corporate Transnationalism on Men's <span class="hlt">Involvement</span> in Family Life and Relationships</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Yasuike, Akiko</p> <p>2011-01-01</p> <p>This study examines the ways in which Japanese corporate transnationalism affects husbands' <span class="hlt">involvement</span> in family life and marital relationships primarily from a perspective of wives. It is based on interviews with 22 Japanese wives and 4 husbands. Studies of Japanese corporate transnationalism treat men as mere supervisors to local workers or…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/ED365917.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/ED365917.pdf"><span id="translatedtitle">Adolescent Abortion and Mandated Parental <span class="hlt">Involvement</span>: The <span class="hlt">Impact</span> of Back Alley Laws on Young Women.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Flinn, Susan; And Others</p> <p></p> <p>This document notes that many states have passed, or are considering, laws that would mandate parental consent for, or notification of, a young woman's decision to obtain an abortion. Constructed in a question-and-answer format, the document then examines a number of issues concerned with such mandated parental <span class="hlt">involvement</span>. It examines who is…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26723499','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26723499"><span id="translatedtitle">Clinical <span class="hlt">impact</span> of radiographic carotid artery <span class="hlt">involvement</span> in neck metastases from head and neck cancer.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Teymoortash, A; Rassow, S; Bohne, F; Wilhelm, T; Hoch, S</p> <p>2016-04-01</p> <p>The treatment of lymph node metastases <span class="hlt">involving</span> the carotid artery is controversial. The aim of the present study was to determine the outcomes of head and neck cancer patients with radiographic carotid artery <span class="hlt">involvement</span> in neck metastases. A total of 27 patients with head and neck cancer and radiologically diagnosed advanced metastases <span class="hlt">involving</span> the common carotid artery or internal carotid artery were enrolled. All patients underwent a primary or salvage neck dissection and surgical carotid peeling. The oncological outcome and survival of all patients were analyzed. Loco-regional control was observed in 13 of the 27 patients (48.1%). During follow-up, five patients (18.5%) developed second primaries and 11 (40.7%) developed distant metastases. The survival time was poor independent of regional control. The median overall survival was 1.55 years and disease-free survival was 0.71 year. Radiographic carotid artery <span class="hlt">involvement</span> in neck metastases in head and neck cancer appears to correlate with a poor long-term prognosis, with a high rate of distant metastases despite loco-regional control. PMID:26723499</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=Liaison+AND+librarian&id=EJ754300','ERIC'); return false;" href="http://eric.ed.gov/?q=Liaison+AND+librarian&id=EJ754300"><span id="translatedtitle">Do a Little Dance: The <span class="hlt">Impact</span> on Students when Librarians Get <span class="hlt">Involved</span> in Extracurricular Activities</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Kasperek, Sheila; Johnson, Amber; Fotta, Katie; Craig, Francis</p> <p>2007-01-01</p> <p>One hundred fifty-two undergraduate students at Mansfield University of Pennsylvania were surveyed to determine if the <span class="hlt">involvement</span> of their liaison librarian in theater productions and orchestra had an effect on their relationship with the library. The study shows positive and statistically significant results for students who participated in…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/ED427880.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/ED427880.pdf"><span id="translatedtitle"><span class="hlt">Impact</span> of Parent <span class="hlt">Involvement</span> on Children's Development and Academic Performance: A Three-Cohort Study.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Marcon, Rebecca A.</p> <p></p> <p>This study examined the possibility of a "threshold" of parent <span class="hlt">involvement</span> with their children's preschools, that can lead to positive child outcomes in a sample of hard-to-engage families. Three cohorts of preschool children were studied, most from low-income, single-parent families. Teachers were interviewed to determine extent of contact they…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015WRR....51.7189C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015WRR....51.7189C"><span id="translatedtitle">The <span class="hlt">impact</span> of transitions between two-fluid and three-fluid phases on fluid configuration and fluid-fluid interfacial area in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Carroll, Kenneth C.; McDonald, Kieran; Marble, Justin; Russo, Ann E.; Brusseau, Mark L.</p> <p>2015-09-01</p> <p>Multiphase-fluid distribution and flow is inherent in numerous areas of hydrology. Yet pore-scale characterization of transitions between two and three immiscible fluids is limited. The objective of this study was to examine the <span class="hlt">impact</span> of such transitions on the pore-scale configuration of organic liquid in a multifluid system comprising natural <span class="hlt">porous</span> media. Three-dimensional images of an organic liquid (trichloroethene) in two-phase (organic-liquid/water) and three-phase (air/organic-liquid/water) systems were obtained using X-ray microtomography before and after drainage and imbibition. Upon transition from a two-phase to a three-phase system, a significant portion of the organic liquid (intermediate wetting fluid) was observed to exist as lenses and films in contact with air (nonwetting fluid). In these cases, the air was either encased by or contiguous to the organic liquid. The presence of air resulted in an increase in the surface-area-to-volume ratios for the organic-liquid blobs. Upon imbibition, the air was displaced downgradient, and concomitantly, the morphology of the organic-liquid blobs no longer in contact with air reverted to that characteristic of a two-phase distribution (i.e., more spherical blobs and ganglia). This change in morphology resulted in a reduction in the surface-area-to-volume ratio. These results illustrate the <span class="hlt">impact</span> of transitions between two-phase and three-phase conditions on fluid configuration, and they demonstrate the malleable nature of fluid configuration under dynamic, multiphase-flow conditions. The results have implications for characterizing and modeling pore-scale flow and mass transfer processes.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/895764','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/895764"><span id="translatedtitle">Resolving the <span class="hlt">Impact</span> of Biological Processes on Water Transport in Unsaturated <span class="hlt">Porous</span> Media Through Nuclear Magnetic Resonance Micro-Imaging</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Seymour, Joseph D.</p> <p>2005-06-01</p> <p>The magnetic resonance microscopy (MRM) work at Montana State University has extended the imaging of a single biofilm in a 1 mm capillary reactor to correlate T2 magnetic relaxation maps displaying biofilm structure with the corresponding velocity patterns in three dimensions in a Staphylococcus epidermidis biofilm fouled square capillary. A square duct geometry is chosen to provide correlation with existing experiments and simulations, as research bioreactors tend to be of square or rectangular cross section for optical or microelectrode access. The spatially resolved velocity data provide details on the <span class="hlt">impact</span> of biofilm induced advection on mass transport from the bulk fluid to the biofilm and through the capillary bioreactor.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li class="active"><span>6</span></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_6 --> <div id="page_7" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li class="active"><span>7</span></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="121"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011AGUFM.H53N..02P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011AGUFM.H53N..02P"><span id="translatedtitle">The 2D versus 3D imaging trade-off: The <span class="hlt">impact</span> of over- or under-estimating small throats for simulating permeability in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Peters, C. A.; Crandell, L. E.; Um, W.; Jones, K. W.; Lindquist, W. B.</p> <p>2011-12-01</p> <p>Geochemical reactions in the subsurface can alter the porosity and permeability of a <span class="hlt">porous</span> medium through mineral precipitation and dissolution. While effects on porosity are relatively well understood, changes in permeability are more difficult to estimate. In this work, pore-network modeling is used to estimate the permeability of a <span class="hlt">porous</span> medium using pore and throat size distributions. These distributions can be determined from 2D Scanning Electron Microscopy (SEM) images of thin sections or from 3D X-ray Computed Tomography (CT) images of small cores. Each method has unique advantages as well as unique sources of error. 3D CT imaging has the advantage of reconstructing a 3D pore network without the inherent geometry-based biases of 2D images but is limited by resolutions around 1 μm. 2D SEM imaging has the advantage of higher resolution, and the ability to examine sub-grain scale variations in porosity and mineralogy, but is limited by the small size of the sample of pores that are quantified. A pore network model was created to estimate flow permeability in a sand-packed experimental column investigating reaction of sediments with caustic radioactive tank wastes in the context of the Hanford, WA site. Before, periodically during, and after reaction, 3D images of the <span class="hlt">porous</span> medium in the column were produced using the X2B beam line facility at the National Synchrotron Light Source (NSLS) at Brookhaven National Lab. These images were interpreted using 3DMA-Rock to characterize the pore and throat size distributions. After completion of the experiment, the column was sectioned and imaged using 2D SEM in backscattered electron mode. The 2D images were interpreted using erosion-dilation to estimate the pore and throat size distributions. A bias correction was determined by comparison with the 3D image data. A special image processing method was developed to infer the pore space before reaction by digitally removing the precipitate. The different sets of pore</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19980201262','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19980201262"><span id="translatedtitle">Department of Physics' <span class="hlt">Involvement</span> of the <span class="hlt">Impact</span> Testing Project of the High Speed Civil Transport Program (HSCT)</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>VonMeerwall, Ernst D.</p> <p>1994-01-01</p> <p>The project <span class="hlt">involved</span> the <span class="hlt">impact</span> testing of a kevlar-like woven polymer material, PBO. The purpose was to determine whether this material showed any promise as a lightweight replacement material for jet engine fan containment. The currently used metal fan containment designs carry a high drag penalty due to their weight. Projectiles were fired at samples of PBO by means of a 0.5 inch diameter Helium powered gun. The Initial plan was to encase the samples inside a purpose-built steel "hot box" for heating and ricochet containment. The research associate's responsibility was to develop the data acquisition programs and techniques necessary to determine accurately the <span class="hlt">impacting</span> projectile's velocity. Beyond this, the Research Associate's duties include any physical computations, experimental design, and data analysis necessary.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/20969922','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20969922"><span id="translatedtitle">Approaches to mitigate the <span class="hlt">impact</span> of dissolved organic matter on the adsorption of synthetic organic contaminants by <span class="hlt">porous</span> carbonaceous sorbents</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Yanping Guo; Abhishek Yadav; Tanju Karanfil</p> <p>2007-11-15</p> <p>Adsorption of trichloroethylene (TCE) and atrazine, two synthetic organic contaminants (SOCs) having different optimum adsorption pore regions, by four activated carbons and an activated carbon fiber (ACF) was examined. Adsorbents included two coconut-shell based granular activated carbons (GACs), two coal-based GACs (F400 and HD4000) and a phenol formaldehyde-based activated carbon fiber. The selected adsorbents had a wide range of pore size distributions but similar surface acidity and hydrophobicity. Single solute and preloading (with a dissolved organic matter (DOM)) isotherms were performed. Single solute adsorption results showed that (i) the adsorbents having higher amounts of pores with sizes about the dimensions of the adsorbate molecules exhibited higher uptakes, (ii) there were some pore structure characteristics, which were not completely captured by pore size distribution analysis, that also affected the adsorption, and (iii) the BET surface area and total pore volume were not the primary factors controlling the adsorption of SOCs. The preloading isotherm results showed that for TCE adsorbing primarily in pores <10 {angstrom}, the highly microporous ACF and GACs, acting like molecular sieves, exhibited the highest uptakes. For atrazine with an optimum adsorption pore region of 10-20 {angstrom}, which overlaps with the adsorption region of some DOM components, the GACs with a broad pore size distribution and high pore volumes in the 10-20 {angstrom} region had the least <span class="hlt">impact</span> of DOM on the adsorption. 25 refs., 3 figs., 3 tabs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3406242','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3406242"><span id="translatedtitle">Nonideal Transport of Contaminants in Heterogeneous <span class="hlt">Porous</span> Media: 9. <span class="hlt">Impact</span> of Contact Time on Desorption and Elution Tailing</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Brusseau, M.L.; Russo, A.E.; Schnaar, G.</p> <p>2012-01-01</p> <p>A series of miscible-displacement experiments was conducted to examine the <span class="hlt">impact</span> of sorption contact time on desorption and elution of trichloroethene from a well-characterized soil. A large number of contact times were examined, spanning 1 hour to 4 years (~2·106 h). Effluent trichloroethene concentrations were monitored over a range of greater than six orders of magnitude, allowing characterization of potential asymptotic tailing. The results of the column experiments showed that trichloroethene exhibited extensive elution tailing for all experiments. Each increase in contact time resulted in a successive increase in the extent of tailing. In total, the number of pore volumes of water flushing required to reach the analytical detection limit increased from approximately 1000 for the one-hour contact time to almost 9000 for the four-year contact time. These results indicate that a contact time of less than one hour produced a sorbed phase that is relatively resistant to desorption, and that a progressive increase in resistance to desorption occurred with increased contact time. A mathematical model incorporating nonlinear, rate-limited sorption/desorption described by a continuous-distribution reaction function was used to successfully simulate the measured data. The nonlinear sorption, the apparent rapid development of desorption resistance, and the progressive increase in resistance with increasing contact time are consistent with behavior anticipated for sorbate interactions with hard-carbon components of the soil. PMID:22608708</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26213084','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26213084"><span id="translatedtitle"><span class="hlt">Impact</span> of different techniques <span class="hlt">involving</span> contact with lees on the volatile composition of cider.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Antón-Díaz, María José; Suárez Valles, Belén; Mangas-Alonso, Juan José; Fernández-García, Ovidio; Picinelli-Lobo, Anna</p> <p>2016-01-01</p> <p>The effect of different treatments <span class="hlt">involving</span> contact with natural lees on the aromatic profile of cider has been evaluated. Comparing with the untreated ciders, the contact with lees brought about a significant increase of the concentrations of most of the volatile compounds analysed, in particular fatty acids, alcohols, ethyl esters and 3-ethoxy-1-propanol. The opposite was observed among fusel acetate esters and 4-vinylguaiacol. The addition of β-glucanase enhanced the increase of ethyl octanoate, but produced a decrease in the contents of decanoic acid and all of the major volatiles excepting acetaldehyde, ethyl acetate and acetoine, whereas the application of oxygen influenced the rise of the level of 3-ethoxy-1-propanol only. The olfactometric profiles also revealed significant effects of the treatment with lees for ethyl propionate, diacetyl, cis-3-hexenol, acetic acid, benzyl alcohol, and m-cresol, while the addition of oxygen significantly influenced the perception of ethyl hexanoate, 1-octen-3-one, 3-methyl-2-butenol, t-3-hexenol and c-3-hexenol. PMID:26213084</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4623853','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4623853"><span id="translatedtitle">The <span class="hlt">impact</span> of emotional <span class="hlt">involvement</span> on online service buying decisions: an event-related potentials perspective</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Wang, Jing; Han, Weiwei</p> <p>2015-01-01</p> <p>When examining a buying process, changes in human brain signals and their event-related potential (ERP) components can be considered a reflection of the consumers’ emotions. In this experiment, participants were shown 12 products and related services that were available for purchase. After recording ERP components, we used a questionnaire to measure the individuals’ emotional <span class="hlt">involvement</span> toward the services (i.e. the same services shown in the stimuli) of the 12 products to measure the emotional valence of the services. The emotional ERP components and the late positive potential (LPP) were elicited under the service conditions and distributed over the left frontal regions. We determined that the services may evoke an LPP and that services with a high emotional value may evoke a larger LPP, which suggests that positive emotion may be measured using the LPP amplitude in the left frontal regions. This result helps elucidate whether positive emotions are stimulated during the product-service system decision-making process and helps understand the emotional valences of different services. Our analysis of the emotional motivation of the consumer suggests that the LPP may be useful as an emotional indicator for measuring consumers’ evaluation of services that provides a neural view of product-service system buying decisions. PMID:26457370</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26457370','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26457370"><span id="translatedtitle">The <span class="hlt">impact</span> of emotional <span class="hlt">involvement</span> on online service buying decisions: an event-related potentials perspective.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Zhao, Meina; Wang, Jing; Han, Weiwei</p> <p>2015-12-01</p> <p>When examining a buying process, changes in human brain signals and their event-related potential (ERP) components can be considered a reflection of the consumers' emotions. In this experiment, participants were shown 12 products and related services that were available for purchase. After recording ERP components, we used a questionnaire to measure the individuals' emotional <span class="hlt">involvement</span> toward the services (i.e. the same services shown in the stimuli) of the 12 products to measure the emotional valence of the services. The emotional ERP components and the late positive potential (LPP) were elicited under the service conditions and distributed over the left frontal regions. We determined that the services may evoke an LPP and that services with a high emotional value may evoke a larger LPP, which suggests that positive emotion may be measured using the LPP amplitude in the left frontal regions. This result helps elucidate whether positive emotions are stimulated during the product-service system decision-making process and helps understand the emotional valences of different services. Our analysis of the emotional motivation of the consumer suggests that the LPP may be useful as an emotional indicator for measuring consumers' evaluation of services that provides a neural view of product-service system buying decisions. PMID:26457370</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013AGUFM.H53C1430R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013AGUFM.H53C1430R"><span id="translatedtitle">Geochemical <span class="hlt">Impact</span> on the Caprock <span class="hlt">Porous</span> Structure during CO2 Geological Storage : A Laboratory and Modeling Study</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Rhenals Garrido, D. R.; Lafortune, S.; Souli, H.; Dubujet, P.</p> <p>2013-12-01</p> <p>CO2 storage is envisioned as a technique which reduces large quantities of CO2 rejected in the atmosphere because of many human activities. The effectiveness of this technique is mainly related to the storage capacity as well as its safety. The safety of this operation is primarily based on the conservation of petro-physical properties of the caprock, which prevents the transport of CO2 towards the surface. However when CO2 reaches the reservoir/caprock interface due to buoyancy effects, the interaction between interstitial fluid and injected fluid creates a serie of dissolution/precipitation reactions affecting the properties of containment of the caprock, which is generally characterized by low transport properties. This study aims to assess the <span class="hlt">impact</span> caused by CO2/interstitial fluid interaction on the nanostructure of a caprock under geological storage conditions. In order to do this, degradation experiments at high pressure of CO2 (88 bar) and isothermal (55°C) conditions have been conducted using batch reactors for 3.5 months. The sample used for these experiments is a well characterized shale, from the Tournemire formation (Aveyron-France). Porosity evolution has been followed by using volumetric adsorption at low pressure, from advanced NLFDT and classical theories based on the micropores filling, and capillary condensation phenomena. Results showed a slight variation in both mesopores and micropores size distributions, as a result of dissolution processes, which dominated at laboratoty time scale. Furthermore, chemical analysis from the water sampled showed an overall increase in Ca,Mg,K,Si,Na. The results obtained by physical adsorption and water chemistry analysis were consistent, with geochemical modeling, which suggested reaction paths with calcite dissolution as the main mineral, by producing porosity at short term and (clays, feldspars) dissolution of aluminosilicates dominating at long term.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/946665','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/946665"><span id="translatedtitle"><span class="hlt">Impact</span> of nonaqueous phase liquid (NAPL) source zone architecture on mass removal mechanisms in strongly layered heterogeneous <span class="hlt">porous</span> media during soil vapor extraction</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Yoon, Hongkyu; Werth, Charlie; Valocchi, Albert J.; Oostrom, Martinus</p> <p>2008-09-26</p> <p>An existing multiphase flow simulator was modified in order to determine the effects of four mechanisms on NAPL mass removal in a strongly layered heterogeneous vadose zone during soil vapor extraction (SVE): a) NAPL flow, b) diffusion and dispersion from low permeability zones, c) slow desorption from sediment grains, and d) rate-limited dissolution of trapped NAPL. The <span class="hlt">impact</span> of water and NAPL saturation distribution, NAPL type (i.e., free, residual, or trapped) distribution, and spatial heterogeneity of the permeability field on these mechanisms were evaluated. Two different initial source zone architectures (one with and one without trapped NAPL) were considered and these architectures were used to evaluate seven different SVE scenarios. For all runs, slow diffusion from low permeability zones that gas flow bypassed was a dominant factor for diminished SVE effectiveness at later times. This effect was more significant at high water saturation due to the decrease of gas-phase relative permeability. Transverse dispersion contributed to fast NAPL mass removal from the low permeability layer in both source zone architectures, but longitudinal dispersion did not affect overall mass removal time. Both slow desorption from sediment grains and rate-limited mass transfer from trapped NAPL only marginally affected removal times. However, mass transfer from trapped NAPL did affect mass removal at late time, as well as the NAPL distribution. NAPL flow from low to high permeability zones contributed to faster mass removal from the low permeability layer, and this effect increased when water infiltration was eliminated. These simulations indicate that if trapped NAPL exists in heterogeneous <span class="hlt">porous</span> media, mass transfer can be improved by delivering gas directly to zones with trapped NAPL and by lowering the water content, which increases the gas relative permeability and changes trapped NAPL to free NAPL.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4568111','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4568111"><span id="translatedtitle">Clinical and Financial <span class="hlt">Impact</span> of Pharmacist <span class="hlt">Involvement</span> in Discharge Medication Reconciliation at an Academic Medical Center: A Prospective Pilot Study</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Parsons, Laura Beth; Pilch, Nicole A. (Weimert); Bullington, Wendy; Hayes, Genevieve L.; Easterling, Heather</p> <p>2015-01-01</p> <p>Background: Medication reconciliation is one of the more challenging aspects of inpatient care, and its accuracy is paramount to safe transitions of care. Studies have shown that pharmacists have a role in medication reconciliation through improving patient safety and avoiding costs associated with medication errors. The wide-scale use of pharmacists in this process has been limited by time constraints, cost, and lack of resources. Objective: This study evaluates the <span class="hlt">impact</span> of pharmacists in resolving medication errors, decreasing readmission rates, and reducing institutional costs during the discharge medication reconciliation process. Methods: Pharmacists evaluated discharge medication reconciliation documentation for patients to determine its accuracy, the accuracy of the admission reconciliation documentation, and any potential issues unrelated to accuracy. Analysis of these data determined the time required for pharmacist <span class="hlt">involvement</span>, the number of errors identified by pharmacists, the quality of pharmacist interventions, the cost avoidance for each error, and the overall <span class="hlt">impact</span> on hospital readmission. Results: During the 7-week study period, pharmacists performed 67 discharge medication reviews and identified 84 errors. Seventy-five percent were considered to be significant and 6% were considered to be serious. The 30-day readmission rate in the study cohort was 18% compared with 20% in the control group. Based on the clinical severity scale and pharmacist salaries, pharmacist interventions resulted in $42,300 in cost avoidance. Conclusion: Pharmacists <span class="hlt">involved</span> in this pilot discharge process identified and resolved significant errors on medication reconciliation orders that resulted in a financial benefit to the institution. PMID:26405342</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/24906461','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/24906461"><span id="translatedtitle">The <span class="hlt">impact</span> of self-concept and college <span class="hlt">involvement</span> on the first-year success of medical students in China.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Zhou, Ying-Xue; Ou, Chun-Quan; Zhao, Zhi-Tao; Wan, Cheng-Song; Guo, Cui; Li, Li; Chen, Ping-Yan</p> <p>2015-03-01</p> <p>Students' first-year academic success plays a critical role on their overall development in college, which implies the need to concentrate on identifying ways to improve students' first-year academic success. Different from most research on the subject, this study attempted to combine the sociological perspective of college <span class="hlt">impact</span> with a psychological perspective to synthetically explore the causal relationship of specific types of self-concept and college <span class="hlt">involvement</span> with academic success of medical students. A longitudinal study was conducted using 519 matriculates at a medical university in mainland China. We conducted the Cooperative Institutional Research Program freshmen survey and the Your First College Year survey to collect data of the pre-college and college academic and social self-concept, college <span class="hlt">involvement</span> components, and some input characteristics. The academic success was measured by the first-year grade point average. A pathway analysis was conducted and showed the following results. Having high academic self-concept, being engaged in class and putting effort in homework or study directly contributes to increasing college achievement. Students' pre-college achievement and self-concept, faculty interaction, and homework <span class="hlt">involvement</span> positively affected students' college academic self-concept development, which indirectly improved average grade point. These findings contribute to our understanding of a student's ability to interact with his or her collegiate environment and to experience academic success. PMID:24906461</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3639501','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3639501"><span id="translatedtitle"><span class="hlt">Porous</span> Shape Memory Polymers</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Hearon, Keith; Singhal, Pooja; Horn, John; Small, Ward; Olsovsky, Cory; Maitland, Kristen C.; Wilson, Thomas S.; Maitland, Duncan J.</p> <p>2013-01-01</p> <p><span class="hlt">Porous</span> shape memory polymers (SMPs) include foams, scaffolds, meshes, and other polymeric substrates that possess <span class="hlt">porous</span> three-dimensional macrostructures. <span class="hlt">Porous</span> SMPs exhibit active structural and volumetric transformations and have driven investigations in fields ranging from biomedical engineering to aerospace engineering to the clothing industry. The present review article examines recent developments in <span class="hlt">porous</span> SMPs, with focus given to structural and chemical classification, methods of characterization, and applications. We conclude that the current body of literature presents <span class="hlt">porous</span> SMPs as highly interesting smart materials with potential for industrial use. PMID:23646038</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/20850235','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20850235"><span id="translatedtitle"><span class="hlt">Impact</span> of <span class="hlt">involved</span> field radiotherapy in partial response after doxorubicin-based chemotherapy for advanced aggressive non-Hodgkin's lymphoma</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Moser, Elizabeth C. . E-mail: e.c.moser@lumc.nl; Kluin-Nelemans, Hanneke C.; Carde, Patrice; Meerwaldt, Jacobus H.; Tirelli, Umberto; Aleman, Berthe M.P.; Baars, Joke; Thomas, Jose; Glabbeke, Martine van; Noordijk, Evert M.</p> <p>2006-11-15</p> <p>Purpose: Whether salvage therapy in patients with advanced aggressive non-Hodgkin's lymphoma (NHL) in partial remission (PR) should consist of radiotherapy or autologous stem-cell transplantation (ASCT) is debatable. We evaluated the <span class="hlt">impact</span> of radiotherapy on outcome in PR patients treated in four successive European Organization for Research and Treatment of Cancer trials for aggressive NHL. Patients and Methods: Records of 974 patients (1980-1999) were reviewed regarding initial response, final outcome, and type and timing of salvage treatment. After 8 cycles of doxorubicin-based chemotherapy, 227 NHL patients were in PR and treated: 114 received <span class="hlt">involved</span> field radiotherapy, 16 ASCT, 93 second-line chemotherapy, and 4 were operated. Overall survival (OS) and progression-free survival (PFS) after radiotherapy were estimated (Kaplan-Meier method) and compared with other treatments (log-rank). <span class="hlt">Impact</span> on survival was evaluated by multivariate analysis (Cox proportional hazards model). Results: The median PFS in PR patients was 4.2 years and 48% remained progression-free at 5 years. Half of the PR patients converted to a complete remission. After conversion, survival was comparable to patients directly in complete remission. Radiotherapy resulted in better OS and PFS compared with other treatments, especially in patients with low to intermediate International Prognostic Index score, bulky disease, or nodal disease only. Correction by multivariate analysis for prognostic factors such as stage, bulky disease, and number of extranodal locations showed that radiotherapy was clearly the most significant factor affecting both OS and PFS. Conclusion: This retrospective analysis demonstrates that radiotherapy can be effective for patients in PR after fully dosed chemotherapy; assessment in a randomized trial (radiotherapy vs. ASCT) is justified.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JLTP..tmp..187M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JLTP..tmp..187M"><span id="translatedtitle">Adsorption on Highly Ordered <span class="hlt">Porous</span> Alumina</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Mistura, Giampaolo; Bruschi, Lorenzo; Lee, Woo</p> <p>2016-04-01</p> <p><span class="hlt">Porous</span> anodic aluminum oxide (AAO) is characterized by a regular arrangement of the pores with a narrow pore size distribution over extended areas, uniform pore depth, and solid pore walls without micropores. Thanks to significant improvements in anodization techniques, structural engineering of AAO allows to accurately tailor the pore morphology. These features make <span class="hlt">porous</span> AAO an excellent substrate to study adsorption phenomena. In this paper, we review recent experiments <span class="hlt">involving</span> the adsorption in <span class="hlt">porous</span> AAO. Particular attention will be devoted to adsorption in straight and structured pores with a closed end which shed new light on fundamental issues like the origin of hysteresis in closed end pores and the nature of evaporation from ink-bottle pores. The results will be compared to those obtained in other synthetic materials like <span class="hlt">porous</span> silicon and silica.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3651970','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3651970"><span id="translatedtitle"><span class="hlt">Involving</span> patient research partners has a significant <span class="hlt">impact</span> on outcomes research: a responsive evaluation of the international OMERACT conferences</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>de Wit, Maarten; Abma, Tineke; Koelewijn-van Loon, Marije; Collins, Sarah; Kirwan, John</p> <p>2013-01-01</p> <p>Objective To assess the inclusion of patients as international research partners in Outcome Measures in Rheumatology (OMERACT) conferences and how this has influenced the scope and conduct of outcomes research in rheumatology. Design A thematic content analysis of OMERACT internal documents, publications and conference proceedings, followed by a responsive evaluation including 32 qualitative semistructured interviews. Setting The international, biannual research conference OMERACT 10 (Malaysia, 2010). Participants Senior researchers (n=10), junior researchers (n=2), representatives of the pharmaceutical industry and regulators (n=2), conference staff (n=2), new patient delegates (n=8) and experienced patient delegates (n=8). Results The role of patients evolved over 10 years from a single patient focus group to full participation in all areas of the meeting and inclusion in research group meetings between conferences. Five main categories of <span class="hlt">impact</span> emerged: widening the research agenda; including patient relevant outcomes in core sets; enhancing patient reported instruments; changing the culture of OMERACT and consequences outside OMERACT. Patient participants identified previously neglected outcome domains such as fatigue, sleep disturbances and flares which prompted collaborative working on new programmes of research. Specific benefits and challenges for patients and professionals were identified, such as personal fulfilment, widening of research interests, difficulties in establishing equal partnerships and concerns about loss of research rigour. Conclusions Including patients as partners in OMERACT conferences has widened its focus and adjusted the way of working. It has resulted in new developments in the research agenda and the use of more patient-relevant outcomes in clinical trials. These collaborations have influenced perceptions and beliefs among many patients and researchers, and led to wider patient <span class="hlt">involvement</span> as partners in research. PMID:23667160</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=Istanbul&pg=6&id=EJ1016713','ERIC'); return false;" href="http://eric.ed.gov/?q=Istanbul&pg=6&id=EJ1016713"><span id="translatedtitle">The <span class="hlt">Impact</span> of Socio-Economic Status on Parental <span class="hlt">Involvement</span> in Turkish Primary Schools: Perspective of Teachers</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Bellibas, Mehmet Sukru; Gumus, Sedat</p> <p>2013-01-01</p> <p>This exploratory qualitative study investigates the effects of socio-economic status on parental <span class="hlt">involvement</span> in public primary schools in Turkey. The study aims to examine how teachers in these schools present the scope of current parental <span class="hlt">involvement</span>, to what factors teachers ascribe the barriers to parental <span class="hlt">involvement</span>, and whether…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=scholar+AND+motivation&pg=5&id=ED547953','ERIC'); return false;" href="http://eric.ed.gov/?q=scholar+AND+motivation&pg=5&id=ED547953"><span id="translatedtitle">The <span class="hlt">Impact</span> of <span class="hlt">Involvement</span> of African American Parents on Students' Achievement in a Middle School</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Lopez, Raquel</p> <p>2012-01-01</p> <p>This applied dissertation was designed to provide better understanding of issues related to parental <span class="hlt">involvement</span> to school officials and scholars. The parental <span class="hlt">involvement</span> at the school was very low and academic achievement was also low. The school leaders were requested to increase parental <span class="hlt">involvement</span> and the School Improvement Plan specified…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/869166','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/869166"><span id="translatedtitle">Ventilation of <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Neeper, Donald A.</p> <p>1994-01-01</p> <p>Methods for distributing gases throughout the interstices of <span class="hlt">porous</span> materials and removing volatile substances from the interstices of <span class="hlt">porous</span> materials. Continuous oscillation of pressures and flows results in increased penetration of the interstices by flowing gases and increased transport of gaseous components out of the interstices. The invention is particularly useful in soil vapor extraction.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/5177290','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/biblio/5177290"><span id="translatedtitle">Ventilation of <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Neeper, D.A.</p> <p>1994-02-22</p> <p>Methods are presented for distributing gases throughout the interstices of <span class="hlt">porous</span> materials and removing volatile substances from the interstices of <span class="hlt">porous</span> materials. Continuous oscillation of pressures and flows results in increased penetration of the interstices by flowing gases and increased transport of gaseous components out of the interstices. The invention is particularly useful in soil vapor extraction. 10 figures.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4067891','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4067891"><span id="translatedtitle">Exploring perceived barriers, drivers, <span class="hlt">impacts</span> and the need for evaluation of public <span class="hlt">involvement</span> in health and social care research: a modified Delphi study</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Snape, D; Kirkham, J; Britten, N; Froggatt, K; Gradinger, F; Lobban, F; Popay, Jennie; Wyatt, K; Jacoby, Ann</p> <p>2014-01-01</p> <p>Objective To explore areas of consensus and conflict in relation to perceived public <span class="hlt">involvement</span> (PI) barriers and drivers, perceived <span class="hlt">impacts</span> of PI and ways of evaluating PI approaches in health and social care research. Background Internationally and within the UK the recognition of potential benefits of PI in health and social care research is gathering momentum and PI is increasingly identified by organisations as a prerequisite for funding. However, there is relatively little examination of the <span class="hlt">impacts</span> of PI and how those <span class="hlt">impacts</span> might be measured. Design Mixed method, three-phase, modified Delphi technique, conducted as part of a larger MRC multiphase project. Sample Clinical and non-clinical academics, members of the public, research managers, commissioners and funders. Findings This study found high levels of consensus about the most important barriers and drivers to PI. There was acknowledgement that tokenism was common in relation to PI; and strong support for the view that demonstrating the <span class="hlt">impacts</span> and value of PI was made more difficult by tokenistic practice. PI was seen as having intrinsic value; nonetheless, there was clear support for the importance of evaluating its <span class="hlt">impact</span>. Research team cohesion and appropriate resources were considered essential to effective PI implementation. Panellists agreed that PI can be challenging, but can be facilitated by clear guidance, together with models of good practice and measurable standards. Conclusions This study is the first to present empirical evidence of the opinions voiced by key stakeholders on areas of consensus and conflict in relation to perceived PI barriers and drivers, perceived <span class="hlt">impacts</span> of PI and the need to evaluate PI. As such it further contributes to debate around best practice in PI, the potential for tokenism and how best to evaluate the <span class="hlt">impacts</span> of PI. These findings have been used in the development of the Public <span class="hlt">Involvement</span> <span class="hlt">Impact</span> Assessment Framework (PiiAF), an online resource which offers</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li class="active"><span>7</span></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_7 --> <div id="page_8" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li class="active"><span>8</span></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="141"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=sexual+AND+satisfaction&pg=7&id=EJ812518','ERIC'); return false;" href="http://eric.ed.gov/?q=sexual+AND+satisfaction&pg=7&id=EJ812518"><span id="translatedtitle">Posttraumatic Stress Disorder and Social Support in Female Victims of Sexual Assault: The <span class="hlt">Impact</span> of Spousal <span class="hlt">Involvement</span> on the Efficacy of Cognitive-Behavioral Therapy</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Billette, Valerie; Guay, Stephane; Marchand, Andre</p> <p>2008-01-01</p> <p>The goal of this study is to enhance the efficacy of CBT with victims of sexual assault suffering from PTSD by getting the spouse <span class="hlt">involved</span>. Thus, in addition to attempting to reduce PTSD symptoms, the therapy focuses on improving the support offered by the spouse and favors management of the <span class="hlt">impact</span> of the traumatic event within the couple. A…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=defining+AND+self-esteem&pg=4&id=ED513677','ERIC'); return false;" href="http://eric.ed.gov/?q=defining+AND+self-esteem&pg=4&id=ED513677"><span id="translatedtitle">An Investigation of the <span class="hlt">Impact</span> of Student Government <span class="hlt">Involvement</span> at One Public Historically Black University on the Career Choice of African American Student Participants</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Laosebikan-Buggs, Morolake O.</p> <p>2009-01-01</p> <p>The purpose of this study was to investigate student participation in collegiate student governance, the <span class="hlt">impact</span> of that <span class="hlt">involvement</span> and its influence on career choice for African-American participants, and to enlighten educators about role and value of collegiate student government participation. If participation in student government and…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=teammates+AND+relationship&id=EJ1017601','ERIC'); return false;" href="http://eric.ed.gov/?q=teammates+AND+relationship&id=EJ1017601"><span id="translatedtitle">The <span class="hlt">Impact</span> of Teachers' and Supervisors' <span class="hlt">Involvement</span> on Students' Skill and Affective Development in Service-Learning</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Leemen, Lee</p> <p>2013-01-01</p> <p>The study reported an assessment of a university-wide curriculum-based service learning program and, based on the assessment data, analyzed the <span class="hlt">impact</span> of teachers' and supervisors' <span class="hlt">involvement</span> on students' skill and affective learning outcomes. The study (n=750) showed that in general the students agreed that their participation in…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/415139','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/415139"><span id="translatedtitle"><span class="hlt">Porous</span> silicon gettering</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Tsuo, Y.S.; Menna, P.; Al-Jassim, M.</p> <p>1995-08-01</p> <p>We have studied a novel extrinsic gettering method that utilizes the very large surface areas, produced by <span class="hlt">porous</span> silicon etch on both front and back surfaces of the silicon wafer, as gettering sites. In this method, a simple and low-cost chemical etching is used to generate the <span class="hlt">porous</span> silicon layers. Then, a high-flux solar furnace (HFSF) is used to provide high-temperature annealing and the required injection of silicon interstitials. The gettering sites, along with the gettered impurities, can be easily removed at the end the process. The <span class="hlt">porous</span> silicon removal process consists of oxidizing the <span class="hlt">porous</span> silicon near the end the gettering process followed by sample immersion in HF acid. Each <span class="hlt">porous</span> silicon gettering process removes up to about 10 {mu}m of wafer thickness. This gettering process can be repeated so that the desired purity level is obtained.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011PhDT........66Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011PhDT........66Y"><span id="translatedtitle">Ultrasonic Nondestructive Characterization of <span class="hlt">Porous</span> Materials</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Yang, Ningli</p> <p>2011-12-01</p> <p>Wave propagation in <span class="hlt">porous</span> media is studied in a wide range of technological applications. In the manufacturing industry, determining porosity of materials in the manufacturing process is required for strict quality control. In the oil industry, acoustic signals and seismic surveys are used broadly to determine the physical properties of the reservoir rock which is a <span class="hlt">porous</span> media filled with oil or gas. In <span class="hlt">porous</span> noise control materials, a precise prediction of sound absorption with frequency and evaluation of tortuosity are necessary. Ultrasonic nondestructive methods are a very important tool for characterization of <span class="hlt">porous</span> materials. The dissertation deals with two types of <span class="hlt">porous</span> media: materials with relatively low and closed porosity and materials with comparatively high and open porosity. Numerical modeling, Finite Element simulations and experimental characterization are all discussed in this dissertation. First, ultrasonic scattering is used to determine the porosity in <span class="hlt">porous</span> media with closed pores. In order get a relationship between the porosity in <span class="hlt">porous</span> materials and ultrasonic scattering independently and to increase the sensitivity to obtain scattering information, ultrasonic imaging methods are applied and acoustic waves are focused by an acoustic lens. To verify the technique, engineered <span class="hlt">porous</span> acrylic plates with varying porosity are measured by ultrasonic scanning and ultrasonic array sensors. Secondly, a laser based ultrasonic technique is explored for predicting the mechanical integrity and durability of cementitious materials. The technique used <span class="hlt">involves</span> the measurement of the phase velocity of fast and slow longitudinal waves in water saturated cement paste. The slow wave velocity is related to the specimen's tortuosity. The fast wave speed is dependent on the elastic properties of <span class="hlt">porous</span> solid. Experimental results detailing the generation and detection of fast and slow wave waves in freshly prepared and aged water-saturated cement samples</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/EJ1092708.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/EJ1092708.pdf"><span id="translatedtitle">Predictors of Parent <span class="hlt">Involvement</span> and Their <span class="hlt">Impact</span> on Access of Postsecondary Education Facilitators among White and American Indian Parents</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Bardhoshi, Gerta; Duncan, Kelly; Schweinle, Amy</p> <p>2016-01-01</p> <p>This study examined demographic factors as predictors of parent <span class="hlt">involvement</span> (engagement with school, support of learning, support of child) among parents of children that attended a school implementing a college access program. The authors also examined whether <span class="hlt">involvement</span> predicted access of postsecondary education facilitators in parents, when…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/EJ1032271.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/EJ1032271.pdf"><span id="translatedtitle">The <span class="hlt">Impact</span> of a Collaborative Family <span class="hlt">Involvement</span> Program on Latino Families and Children's Educational Performance</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>O'Donnell, Julie; Kirkner, Sandra L.</p> <p>2014-01-01</p> <p>Latino families highly value education and are committed to their children's educational success; however, Latino students often experience educational challenges. Well-designed family <span class="hlt">involvement</span> programs can encourage Latino families, especially new immigrants or monolingual Spanish-speakers, to increase their <span class="hlt">involvement</span> resulting in…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ars.usda.gov/research/publications/Publications.htm?seq_no_115=229969','TEKTRAN'); return false;" href="http://www.ars.usda.gov/research/publications/Publications.htm?seq_no_115=229969"><span id="translatedtitle">Structure of <span class="hlt">Porous</span> Starch Microcellular Foam Particles</span></a></p> <p><a target="_blank" href="http://www.ars.usda.gov/services/TekTran.htm">Technology Transfer Automated Retrieval System (TEKTRAN)</a></p> <p></p> <p></p> <p>A relatively new starch product with various novel applications is a <span class="hlt">porous</span> microcellular foam. The foam product is made by dehydrating a starch hydrogel in a solvent such as ethanol and then removing the solvent to form a foam product. The process <span class="hlt">involves</span> heating an aqueous slurry of starch (8% w/...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1064437','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1064437"><span id="translatedtitle">Preparation of asymmetric <span class="hlt">porous</span> materials</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Coker, Eric N.</p> <p>2012-08-07</p> <p>A method for preparing an asymmetric <span class="hlt">porous</span> material by depositing a <span class="hlt">porous</span> material film on a flexible substrate, and applying an anisotropic stress to the <span class="hlt">porous</span> media on the flexible substrate, where the anisotropic stress results from a stress such as an applied mechanical force, a thermal gradient, and an applied voltage, to form an asymmetric <span class="hlt">porous</span> material.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1041028','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1041028"><span id="translatedtitle"><span class="hlt">POROUS</span> WALL, HOLLOW GLASS MICROSPHERES</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Sexton, W.</p> <p>2012-06-30</p> <p>Hollow Glass Microspheres (HGM) is not a new technology. All one has to do is go to the internet and Google{trademark} HGM. Anyone can buy HGM and they have a wide variety of uses. HGM are usually between 1 to 100 microns in diameter, although their size can range from 100 nanometers to 5 millimeters in diameter. HGM are used as lightweight filler in composite materials such as syntactic foam and lightweight concrete. In 1968 a patent was issued to W. Beck of the 3M{trademark} Company for 'Glass Bubbles Prepared by Reheating Solid Glass Particles'. In 1983 P. Howell was issued a patent for 'Glass Bubbles of Increased Collapse Strength' and in 1988 H. Marshall was issued a patent for 'Glass Microbubbles'. Now Google{trademark}, <span class="hlt">Porous</span> Wall, Hollow Glass Microspheres (PW-HGMs), the key words here are <span class="hlt">Porous</span> Wall. Almost every article has its beginning with the research done at the Savannah River National Laboratory (SRNL). The Savannah River Site (SRS) where SRNL is located has a long and successful history of working with hydrogen and its isotopes for national security, energy, waste management and environmental remediation applications. This includes more than 30 years of experience developing, processing, and implementing special ceramics, including glasses for a variety of Department of Energy (DOE) missions. In the case of glasses, SRS and SRNL have been <span class="hlt">involved</span> in both the science and engineering of vitreous or glass based systems. As a part of this glass experience and expertise, SRNL has developed a number of niches in the glass arena, one of which is the development of <span class="hlt">porous</span> glass systems for a variety of applications. These <span class="hlt">porous</span> glass systems include sol gel glasses, which include both xerogels and aerogels, as well as phase separated glass compositions, that can be subsequently treated to produce another unique type of porosity within the glass forms. The <span class="hlt">porous</span> glasses can increase the surface area compared to 'normal glasses of a 1 to 2 order of</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20080004797','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20080004797"><span id="translatedtitle">Fabricating <span class="hlt">porous</span> silicon carbide</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Shor, Joseph S. (Inventor); Kurtz, Anthony D. (Inventor)</p> <p>1994-01-01</p> <p>The formation of <span class="hlt">porous</span> SiC occurs under electrochemical anodization. A sample of SiC is contacted electrically with nickel and placed into an electrochemical cell which cell includes a counter electrode and a reference electrode. The sample is encapsulated so that only a bare semiconductor surface is exposed. The electrochemical cell is filled with an HF electrolyte which dissolves the SiC electrochemically. A potential is applied to the semiconductor and UV light illuminates the surface of the semiconductor. By controlling the light intensity, the potential and the doping level, a <span class="hlt">porous</span> layer is formed in the semiconductor and thus one produces <span class="hlt">porous</span> SiC.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/27352035','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27352035"><span id="translatedtitle">Exploring the <span class="hlt">impacts</span> of factors contributing to tram-<span class="hlt">involved</span> serious injury crashes on Melbourne tram routes.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Naznin, Farhana; Currie, Graham; Logan, David</p> <p>2016-09-01</p> <p>Previous research is limited regarding factors influencing tram-<span class="hlt">involved</span> serious injury crashes. The aim of this study is to identify key vehicle, road, environment and driver related factors associated with tram-<span class="hlt">involved</span> serious injury crashes. Using a binary logistic regression modelling approach, the following factors were identified to be significant in influencing tram-<span class="hlt">involved</span> fatal crashes in Melbourne: tram floor height, tram age, season, traffic volume, tram lane priority and tram travel speed. Low floor trams, older trams, tram priority lanes and higher tram travelling speeds are more likely to increase tram-<span class="hlt">involved</span> fatal crashes. Higher traffic volume decreases the likelihood of serious crashes. Fatal crashes are more likely to occur during spring and summer. Findings from this study may offer ideas for future research in the area of tram safety and help to develop countermeasures to prevent specific fatality types from occurring. PMID:27352035</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1013836','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1013836"><span id="translatedtitle">Method to prepare nanoparticles on <span class="hlt">porous</span> mediums</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Vieth, Gabriel M [Knoxville, TN; Dudney, Nancy J [Oak Ridge, TN; Dai, Sheng [Knoxville, TN</p> <p>2010-08-10</p> <p>A method to prepare <span class="hlt">porous</span> medium decorated with nanoparticles <span class="hlt">involves</span> contacting a suspension of nanoparticles in an ionic liquid with a <span class="hlt">porous</span> medium such that the particles diffuse into the pores of the medium followed by heating the resulting composition to a temperature equal to or greater than the thermal decomposition temperature of the ionic liquid resulting in the removal of the liquid portion of the suspension. The nanoparticles can be a metal, an alloy, or a metal compound. The resulting compositions can be used as catalysts, sensors, or separators.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1037524','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/1037524"><span id="translatedtitle"><span class="hlt">Porous</span> Organic Molecular Materials</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Tian, Jian; Thallapally, Praveen K.; McGrail, B. Peter</p> <p>2012-01-01</p> <p>Most nanoporous materials with molecular-scale pores are extended frameworks composed of directional covalent or coordination bonding, such as <span class="hlt">porous</span> metal-organic frameworks and organic network polymers. By contrast, nanoporous materials comprised of discrete organic molecules, between which there are only weak non-covalent interactions, are seldom encountered. Indeed, most organic molecules pack efficiently in the solid state to minimize the void volume, leading to non-<span class="hlt">porous</span> materials. In recent years, a significant number of nanoporous organic molecular materials, which may be either crystalline or amorphous, have been confirmed by the studies of gas adsorption and they are surveyed in this Highlight. In addition, the possible advantages of <span class="hlt">porous</span> organic molecular materials over <span class="hlt">porous</span> networks are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26207673','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26207673"><span id="translatedtitle">The <span class="hlt">impact</span> of practical support on parental bereavement: Reflections from a study <span class="hlt">involving</span> parents bereaved through military death.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Rolls, Liz; Harper, Mairi</p> <p>2016-01-01</p> <p>This article, drawing on data from a wider study, describes the <span class="hlt">impact</span> that U.K. bereaved military parents ascribe to the practical support (help with home and garden maintenance) that they received following the death of their son. The type of practical support offered to parents has had a wide-ranging and significant <span class="hlt">impact</span> on them. In addition to helping them find meaning and maintain continuing bonds, this form of support contributed to their capacity to engage in restoration-focused coping. As a symbolic resource, this type of practical support may be a significant moderator of distress in the psychosocial transition of bereavement. PMID:26207673</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1018059','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1018059"><span id="translatedtitle">Metal filled <span class="hlt">porous</span> carbon</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Gross, Adam F.; Vajo, John J.; Cumberland, Robert W.; Liu, Ping; Salguero, Tina T.</p> <p>2011-03-22</p> <p>A <span class="hlt">porous</span> carbon scaffold with a surface and pores, the <span class="hlt">porous</span> carbon scaffold containing a primary metal and a secondary metal, where the primary metal is a metal that does not wet the surface of the pores of the carbon scaffold but wets the surface of the secondary metal, and the secondary metal is interspersed between the surface of the pores of the carbon scaffold and the primary metal.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20080004302','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20080004302"><span id="translatedtitle"><span class="hlt">Porous</span> airfoil and process</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Hartwich, Peter M. (Inventor)</p> <p>1992-01-01</p> <p>A <span class="hlt">porous</span> airfoil having venting cavities with contoured barrier walls, formed by a core piece, placed beneath a <span class="hlt">porous</span> upper and lower surface area that stretches over the nominal chord of an airfoil is employed, to provide an airfoil configuration that becomes self-adaptive to very dissimilar flow conditions to thereby improve the lift and drag characteristics of the airfoil at both subcritical and supercritical conditions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005JSG....27.1469J&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005JSG....27.1469J&link_type=ABSTRACT"><span id="translatedtitle">The <span class="hlt">impact</span> of syn-faulting porosity reduction on damage zone architecture in <span class="hlt">porous</span> sandstone: an outcrop example from the Moab Fault, Utah</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Johansen, Tord Erlend Skeie; Fossen, Haakon; Kluge, Richard</p> <p>2005-08-01</p> <p>Deformation structures in the Jurassic Moab Member of the Entrada Sandstone have been studied in the Courthouse area where two major fault segments (Segments A and B) of the Moab Fault are connected. Field data show that Segment A developed from an early stage of (thick) deformation band formation and that distinctively thinner deformation bands and fractures were subsequently added to its damage zone at a later stage. Only the second stage is expressed along Segment B. Geometric and kinematic evidence indicates that Segment B linked with Segment A at the time when Segment A (and its thick deformation bands) was already present in the Courthouse area. We attribute the transition from thick deformation bands to thin deformation bands to pore-space reduction caused by syn-faulting quartz dissolution and precipitation that changed the mechanical properties of the rock. In this model, thin deformation bands formed as porosity was reduced during quartz diagenesis. The observations underscore the importance of syn-kinematic diagenetic changes and the variation in small-scale structures along faults that apparently formed during the same faulting event in <span class="hlt">porous</span> sandstones.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JPS...287..422T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JPS...287..422T"><span id="translatedtitle"><span class="hlt">Impact</span> of micro-<span class="hlt">porous</span> layer on liquid water distribution at the catalyst layer interface and cell performance in a polymer electrolyte membrane fuel cell</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tabe, Yutaka; Aoyama, Yusuke; Kadowaki, Kazumasa; Suzuki, Kengo; Chikahisa, Takemi</p> <p>2015-08-01</p> <p>In polymer electrolyte membrane fuel cells, a gas diffusion layer (GDL) with a micro-<span class="hlt">porous</span> layer (MPL) gives better anti-flooding performance than GDLs without an MPL. To investigate the function and mechanism of the MPL to suppress water flooding, the liquid water distribution at the cathode catalyst layer (CL) surface are observed by a freezing method; in the method liquid water is immobilized in ice form by rapid freezing, followed by disassembling the cell for observations. The ice covered area is quantified by image processing and cells with and without an MPL are compared. The results show that the MPL suppresses water accumulation at the interface due to smaller pore size and finer contact with the CL, and this results in less water flooding. Investigation of ice formed after -10 °C cold start shutdowns and the temporary performance deterioration at ordinary temperatures also indicates a significant influence of the liquid water accumulating at the interface. The importance of the fine contact between CL and MPL, the relative absence of gaps, is demonstrated by a gas diffusion electrode (GDE) which is directly coated with catalyst ink on the surface of the MPL achieving finer contact of the layers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=Msds&pg=2&id=EJ780334','ERIC'); return false;" href="http://eric.ed.gov/?q=Msds&pg=2&id=EJ780334"><span id="translatedtitle">The <span class="hlt">Impact</span> of Partner Training on the Communicative <span class="hlt">Involvement</span> of Students with Multiple and Severe Disability in Special Schools</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Foreman, Phil; Arthur-Kelly, Michael; Pascoe, Sue</p> <p>2007-01-01</p> <p>Background: The outcomes of a pilot program of staff development in communication support in the context of observed changes in student behaviour states and interactive abilities are reported. Participant reports about the <span class="hlt">impact</span> of the program on their professional practices are included. Method: Six teachers and six teacher aides in special…</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li class="active"><span>8</span></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_8 --> <div id="page_9" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li class="active"><span>9</span></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="161"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=characteristic+AND+academic+AND+success&id=EJ1051177','ERIC'); return false;" href="http://eric.ed.gov/?q=characteristic+AND+academic+AND+success&id=EJ1051177"><span id="translatedtitle">The <span class="hlt">Impact</span> of Self-Concept and College <span class="hlt">Involvement</span> on the First-Year Success of Medical Students in China</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Zhou, Ying-Xue; Ou, Chun-Quan; Zhao, Zhi-Tao; Wan, Cheng-Song; Guo, Cui; Li, Li; Chen, Ping-Yan</p> <p>2015-01-01</p> <p>Students' first-year academic success plays a critical role on their overall development in college, which implies the need to concentrate on identifying ways to improve students' first-year academic success. Different from most research on the subject, this study attempted to combine the sociological perspective of college <span class="hlt">impact</span> with a…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=KREBS&pg=5&id=EJ842258','ERIC'); return false;" href="http://eric.ed.gov/?q=KREBS&pg=5&id=EJ842258"><span id="translatedtitle">The <span class="hlt">Impact</span> of Residential and Nonresidential Drug Treatment on Recidivism among Drug-<span class="hlt">Involved</span> Probationers: A Survival Analysis</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Krebs, Christopher P.; Strom, Kevin J.; Koetse, Willem H.; Lattimore, Pamela K.</p> <p>2009-01-01</p> <p>A variety of approaches for addressing drug use and drug-related crime among the nearly 5 million offenders on community supervision in the United States has been tried and evaluated, but questions remain about which policies or programs are most effective. The authors use a large data set to assess the <span class="hlt">impact</span> of residential and nonresidential…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=diabete&pg=3&id=EJ1028945','ERIC'); return false;" href="http://eric.ed.gov/?q=diabete&pg=3&id=EJ1028945"><span id="translatedtitle"><span class="hlt">Impact</span> of a District-Wide Diabetes Prevention Programme <span class="hlt">Involving</span> Health Education for Children and the Community</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Sheeladevi, Sethu; Sagar, Jayanthi; Pujari, Siddharth; Rani, Padmaja Kumari</p> <p>2014-01-01</p> <p>Objective: To present results from a district-wide diabetes prevention programme <span class="hlt">involving</span> health education for school children and the local community. Method: The model of health education that was utilized aimed to secure lifestyle changes and the identification of diabetes risk by school children (aged 9-12 years). The children acted as health…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20030059013','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20030059013"><span id="translatedtitle">Application of Passive <span class="hlt">Porous</span> Treatment to Slat Trailing Edge Noise</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Khorrami, Mehdi R.; Choudhari, Meelan M.</p> <p>2003-01-01</p> <p><span class="hlt">Porous</span> trailing-edge treatment is investigated as a passive means for slat noise reduction by using time-accurate simulations based on Reynolds-averaged Navier-Stokes equations. For the model scale high-lift configuration used during previous experiments in the Low-Turbulence Pressure Tunnel at NASA Langley Research Center, application of the proposed treatment over a minute fraction of the slat surface area is shown to mitigate the noise <span class="hlt">impact</span> of the trailing edge, with no measurable aerodynamic penalty. Assessment of the pressure fluctuations in the vicinity of the treated edge indicates a potential noise reduction in excess of 20 dB. The primary mechanism underlying this reduction is related to the reduced strength of Strouhal shedding from the finite thickness trailing edge. A secondary effect of the treatment <span class="hlt">involves</span> an upward shift in the Strouhal-shedding frequency to a frequency band of reduced auditory sensitivity in a full-scale application.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JaJAP..55bBD03M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JaJAP..55bBD03M"><span id="translatedtitle">Luminescence stability of <span class="hlt">porous</span> Si terminated by hydrophilic organic molecules</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Matsumoto, Kimihisa; Kamiguchi, Masao; Kamiya, Kazuhide; Nomura, Takashi; Suzuki, Shinya</p> <p>2016-02-01</p> <p>The effects of the surface termination of a <span class="hlt">porous</span> Si surface by propionic acid and by undecylenic acid on their hydrophilicity and luminescence stability were studied. In the measurements of the contact angle of water droplets on <span class="hlt">porous</span> Si films, the hydrophilicity of <span class="hlt">porous</span> Si is improved by the surface termination each types of organic molecule. The PL intensity of as-prepared <span class="hlt">porous</span> Si decreased with increasing aging time in ambient air. As PL quenching <span class="hlt">involves</span> PL blue shift and increasing Si-O bonds density, nonradiative recombination centers are formed in the surface oxide. After the hydrosilylation process of propionic acid and undecylenic acid, PL intensity decreased and became 30% that of as-prepared <span class="hlt">porous</span> Si film. However, the PL intensity was stable and exceeded that of the as-prepared film after 1000 min of aging in the ambient air. The PL stabilities are contributed to the termination by organic molecules that inhibits surface oxidation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015EGUGA..17.7204C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015EGUGA..17.7204C"><span id="translatedtitle">Influence of permeability anisotropy on mixing controlled reactive transport simulations in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chiogna, Gabriele; Herrera, Paulo</p> <p>2015-04-01</p> <p>Several studies have demonstrated how plume deformation induced by flow heterogeneity in <span class="hlt">porous</span> media can enhance mixing of reactants. This enhancement can have important <span class="hlt">impact</span> on mixing controlled reactions such a biodegradation of plumes of organic compounds. On the other hand, recent studies have indicated the possibility of observing complex flow topology on groundwater flow that occurs in anisotropic yet homogenous <span class="hlt">porous</span> media. Moreover, it has been demonstrated that those complex flow topologies can also enhance solute mixing. We study the effect of medium anisotropy on reactive solute transport for the case of a chemical reactor composed of two homogeneous anisotropic layers. We simulate different injection strategies for different chemical reactions that <span class="hlt">involve</span> two reactants. We demonstrate the effect of the medium anisotropy by analyzing the results of the simulations and identify best strategies for the operation and design of the system to maximize reaction rates. These findings could have potential application in the design of new remediation systems for contaminated groundwater, chemical reactors and other engineering problems that <span class="hlt">involve</span> flow through <span class="hlt">porous</span> media.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015HMT....51..313M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015HMT....51..313M"><span id="translatedtitle">Scaling heat and mass flow through <span class="hlt">porous</span> media during pyrolysis</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Maes, Julien; Muggeridge, Ann H.; Jackson, Matthew D.; Quintard, Michel; Lapene, Alexandre</p> <p>2015-03-01</p> <p>The modelling of heat and mass flow through <span class="hlt">porous</span> media in the presence of pyrolysis is complex because various physical and chemical phenomena need to be represented. In addition to the transport of heat by conduction and convection, and the change of properties with varying pressure and temperature, these processes <span class="hlt">involve</span> transport of mass by convection, evaporation, condensation and pyrolysis chemical reactions. Examples of such processes include pyrolysis of wood, thermal decomposition of polymer composite and in situ upgrading of heavy oil and oil shale. The behaviours of these systems are difficult to predict as relatively small changes in the material composition can significantly change the thermophysical properties. Scaling reduces the number of parameters in the problem statement and quantifies the relative importance of the various dimensional parameters such as permeability, thermal conduction and reaction constants. This paper uses inspectional analysis to determine the minimum number of dimensionless scaling groups that describe the decomposition of a solid <span class="hlt">porous</span> material into a gas in one dimension. Experimental design is then used to rank these scaling groups in terms of their importance in describing the outcome of two example processes: the thermal decomposition of heat shields formed from polymer composites and the in situ upgrading of heavy oils and oil shales. A sensitivity analysis is used to divide these groups into three sets (primary, secondary and insignificant), thus identifying the combinations of solid and fluid properties that have the most <span class="hlt">impact</span> on the performance of the different processes.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4459695','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4459695"><span id="translatedtitle">What Difference Does Patient and Public <span class="hlt">Involvement</span> Make and What Are Its Pathways to <span class="hlt">Impact</span>? Qualitative Study of Patients and Researchers from a Cohort of Randomised Clinical Trials</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Dudley, Louise; Gamble, Carrol; Preston, Jennifer; Buck, Deborah; Hanley, Bec; Williamson, Paula; Young, Bridget</p> <p>2015-01-01</p> <p>Background Patient and public <span class="hlt">involvement</span> (PPI) is advocated in clinical trials yet evidence on how to optimise its <span class="hlt">impact</span> is limited. We explored researchers' and PPI contributors' accounts of the <span class="hlt">impact</span> of PPI within trials and factors likely to influence its <span class="hlt">impact</span>. Methods Semi-structured qualitative interviews with researchers and PPI contributors accessed through a cohort of randomised clinical trials. Analysis of transcripts of audio-recorded interviews was informed by the principles of the constant comparative method, elements of content analysis and informant triangulation. Results We interviewed 21 chief investigators, 10 trial managers and 17 PPI contributors from 28 trials. The accounts of informants within the same trials were largely in agreement. Over half the informants indicted PPI had made a difference within a trial, through contributions that influenced either an aspect of a trial, or how researchers thought about a trial. According to informants, the opportunity for PPI to make a difference was influenced by two main factors: whether chief investigators had goals and plans for PPI and the quality of the relationship between the research team and the PPI contributors. Early <span class="hlt">involvement</span> of PPI contributors and including them in responsive (e.g. advisory groups) and managerial (e.g. trial management groups) roles were more likely to achieve <span class="hlt">impact</span> compared to late <span class="hlt">involvement</span> and oversight roles (e.g. trial steering committees). Conclusion Those seeking to enhance PPI in trials should develop goals for PPI at an early stage that fits the needs of the trial, plan PPI implementation in accordance with these goals, invest in developing good relationships between PPI contributors and researchers, and favour responsive and managerial roles for contributors in preference to oversight-only roles. These features could be used by research funders in judging PPI in trial grant applications and to inform policies to optimise PPI within trials. PMID:26053063</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/20372729','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/20372729"><span id="translatedtitle">Molecular diffusion in <span class="hlt">porous</span> media by PGSE ESR.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Talmon, Yael; Shtirberg, Lazar; Harneit, Wolfgang; Rogozhnikova, Olga Yu; Tormyshev, Victor; Blank, Aharon</p> <p>2010-06-21</p> <p>Diffusion in <span class="hlt">porous</span> media is a general subject that <span class="hlt">involves</span> many fields of research, such as chemistry (e.g. <span class="hlt">porous</span> catalytic pallets), biology (e.g. <span class="hlt">porous</span> cellular organelles), and materials science (e.g. <span class="hlt">porous</span> polymer matrixes for controlled-release and gas-storage materials). Pulsed-gradient spin-echo nuclear magnetic resonance (PGSE NMR) is a powerful technique that is often employed to characterize complex diffusion patterns inside <span class="hlt">porous</span> media. Typically it measures the motion of at least approximately 10(15) molecules occurring in the milliseconds-to-seconds time scale, which can be used to characterize diffusion in <span class="hlt">porous</span> media with features of approximately 2-3 mum and above (in common aqueous environments). Electron Spin Resonance (ESR), which operates in the nanoseconds-to-microseconds time scale with much better spin sensitivity, can in principle be employed to measure complex diffusion patterns in <span class="hlt">porous</span> media with much finer features (down to approximately 10 nm). However, up to now, severe technical constraints precluded the adaptation of PGSE ESR to <span class="hlt">porous</span> media research. In this work we demonstrate for the first time the use of PGSE ESR in the characterization of molecular restricted diffusion in common liquid solutions embedded in a model system for <span class="hlt">porous</span> media made of sub-micron glass spheres. A unique ESR resonator, efficient gradient coils and fast gradient current drivers enable these measurements. This work can be further extended in the future to many applications that <span class="hlt">involve</span> dynamical processes occurring in <span class="hlt">porous</span> media with features in the deep sub-micron range down to true nanometric length scales. PMID:20372729</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/23416226','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/23416226"><span id="translatedtitle">Radioactive characterization of the main materials <span class="hlt">involved</span> in the titanium dioxide production process and their environmental radiological <span class="hlt">impact</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Mantero, J; Gazquez, M J; Bolivar, J P; Garcia-Tenorio, R; Vaca, F</p> <p>2013-06-01</p> <p>A study about the distribution of several radionuclides from the uranium and the thorium series radionuclides along the production process of a typical NORM industry devoted to the production of titanium dioxide has been performed. With this end the activity concentrations in raw materials, final product, co-products, and wastes of the production process have been determined by both gamma-ray and alpha-particle spectrometry. The main raw material used in the studied process (ilmenite) presents activity concentrations of around 300 Bq kg(-1) for Th-series radionuclides and 100 Bq kg(-1) for the U-series ones. These radionuclides in the industrial process are distributed in the different steps of the production process according mostly to the chemical behaviour of each radioelement, following different routes. As an example, most of the radium remains associated with the un-dissolved material waste, with activity concentrations around 3 kBq kg(-1) of (228)Ra and around 1 kBq kg(-1) of (226)Ra, while the final commercial products (TiO2 pigments and co-products) contain negligible amounts of radioactivity. The obtained results have allowed assessing the possible public radiological <span class="hlt">impact</span> associated with the use of the products and co-products obtained in this type of industry, as well as the environmental radiological <span class="hlt">impact</span> associated with the solid residues and liquid generated discharges. PMID:23416226</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/230563','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/230563"><span id="translatedtitle">Parametric study of boiling heat transfer in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Shi, B.; Jones, B.G.; Pan, C.</p> <p>1996-04-01</p> <p>Detailed numerical modeling and parametric variation studies were conducted on boiling heat transfer processes in <span class="hlt">porous</span> deposits with emphasis on applications associated with light water nuclear power reactor systems. The processes of boiling heat transfer in the <span class="hlt">porous</span> corrosion deposits typically <span class="hlt">involve</span> phase changes in finite volumetric regions in the <span class="hlt">porous</span> media. The study examined such processes in two <span class="hlt">porous</span> media configurations, without chimneys (homogeneous <span class="hlt">porous</span> structures) and with chimneys (heterogeneous <span class="hlt">porous</span> structures). A 1-D model and a 2-D model were developed to simulate two-phase flows with phase changes, without dry-out, inside the <span class="hlt">porous</span> media for both structural configurations. For closure of the governing equations, an empirical correlation of the evaporation rate for phase changes inside the <span class="hlt">porous</span> media was introduced. In addition, numerical algorithms were developed to solve the coupled nonlinear equations of mass, momentum, energy, capillary pressure, and evaporation rate. The distributions of temperature, thermodynamic saturation, liquid pressure, vapor pressure, liquid velocity, and vapor velocity were predicted. Furthermore, the effects of heat flux, system pressure, porosity, particle diameter, chimney population density, chimney radius, and crud thickness on the all superheat, critical heat flux, and minimum saturation were examined. The predictions were found to be in good agreement with the available experimental results.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/24629567','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/24629567"><span id="translatedtitle">Attitudes toward hiring applicants with mental illness and criminal justice <span class="hlt">involvement</span>: the <span class="hlt">impact</span> of education and experience.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Batastini, Ashley B; Bolanos, Angelea D; Morgan, Robert D</p> <p>2014-01-01</p> <p>Individuals with mental health diagnoses, as well as those <span class="hlt">involved</span> in the criminal justice system, experience a number of barriers in the recovery and reintegration progress, including access to stable, prosocial employment opportunities. Employment for these populations is important for establishing financial security, reducing unstructured leisure time, increasing self-worth, and improving interpersonal skills. However, research has demonstrated that individuals with psychiatric and/or criminal backgrounds may experience stigmatizing attitudes from employers that impede their ability to find adequate work. This study aimed to evaluate stigmatizing beliefs toward hypothetical applicants who indicated a mental health history, a criminal history, or both, as well as the effectiveness of psychoeducation in reducing stigma. Participants consisted of 465 individuals recruited from a large university who completed a series of online questions about a given applicant. Results of this study varied somewhat across measures of employability, but were largely consistent with extant research suggesting that mental illness and criminal justice <span class="hlt">involvement</span> serve as deterrents when making hiring decisions. Overall, psychoeducation appeared to reduce stigma for hiring decisions when the applicant presented with a criminal history. Unfortunately, similar findings were not revealed when applicants presented with a psychiatric or a psychiatric and criminal history. Implications and limitations of these findings are presented, along with suggestions for future research. PMID:24629567</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/5866567','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/5866567"><span id="translatedtitle">Foams in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Marsden, S.S.</p> <p>1986-07-01</p> <p>In 1978 a literature search on selective blocking of fluid flow in <span class="hlt">porous</span> media was done by Professor S.S. Marsden and two of his graduate students, Tom Elson and Kern Huppy. This was presented as SUPRI Report No. TR-3 entitled ''Literature Preview of the Selected Blockage of Fluids in Thermal Recovery Projects.'' Since then a lot of research on foam in <span class="hlt">porous</span> media has been done on the SUPRI project and a great deal of new information has appeared in the literature. Therefore we believed that a new, up-to-date search should be done on foam alone, one which would be helpful to our students and perhaps of interest to others. This is a chronological survey showing the development of foam flow, blockage and use in <span class="hlt">porous</span> media, starting with laboratory studies and eventually getting into field tests and demonstrations. It is arbitrarily divided into five-year time periods. 81 refs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1040878','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1040878"><span id="translatedtitle"><span class="hlt">Porous</span> material neutron detector</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Diawara, Yacouba; Kocsis, Menyhert</p> <p>2012-04-10</p> <p>A neutron detector employs a <span class="hlt">porous</span> material layer including pores between nanoparticles. The composition of the nanoparticles is selected to cause emission of electrons upon detection of a neutron. The nanoparticles have a maximum dimension that is in the range from 0.1 micron to 1 millimeter, and can be sintered with pores thereamongst. A passing radiation generates electrons at one or more nanoparticles, some of which are scattered into a pore and directed toward a direction opposite to the applied electrical field. These electrons travel through the pore and collide with additional nanoparticles, which generate more electrons. The electrons are amplified in a cascade reaction that occurs along the pores behind the initial detection point. An electron amplification device may be placed behind the <span class="hlt">porous</span> material layer to further amplify the electrons exiting the <span class="hlt">porous</span> material layer.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=104339&keyword=Physics+AND+engineers&actType=&TIMSType=+&TIMSSubTypeID=&DEID=&epaNumber=&ntisID=&archiveStatus=Both&ombCat=Any&dateBeginCreated=&dateEndCreated=&dateBeginPublishedPresented=&dateEndPublishedPresented=&dateBeginUpdated=&dateEndUpdated=&dateBeginCompleted=&dateEndCompleted=&personID=&role=Any&journalID=&publisherID=&sortBy=revisionDate&count=50&CFID=65335586&CFTOKEN=47685152','EPA-EIMS'); return false;" href="http://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=104339&keyword=Physics+AND+engineers&actType=&TIMSType=+&TIMSSubTypeID=&DEID=&epaNumber=&ntisID=&archiveStatus=Both&ombCat=Any&dateBeginCreated=&dateEndCreated=&dateBeginPublishedPresented=&dateEndPublishedPresented=&dateBeginUpdated=&dateEndUpdated=&dateBeginCompleted=&dateEndCompleted=&personID=&role=Any&journalID=&publisherID=&sortBy=revisionDate&count=50&CFID=65335586&CFTOKEN=47685152"><span id="translatedtitle">FLUID TRANSPORT THROUGH <span class="hlt">POROUS</span> MEDIA</span></a></p> <p><a target="_blank" href="http://oaspub.epa.gov/eims/query.page">EPA Science Inventory</a></p> <p></p> <p></p> <p>Fluid transport through <span class="hlt">porous</span> media is a relevant topic to many scientific and engineering fields. Soil scientists, civil engineers, hydrologists and hydrogeologists are concerned with the transport of water, gases and nonaqueous phase liquid contaminants through <span class="hlt">porous</span> earth m...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19910000511&hterms=porous+silicon&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3Dporous%2Bsilicon','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19910000511&hterms=porous+silicon&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3Dporous%2Bsilicon"><span id="translatedtitle">Chemically Layered <span class="hlt">Porous</span> Solids</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Koontz, Steve</p> <p>1991-01-01</p> <p>Aerogels and other <span class="hlt">porous</span> solids in which surfaces of pores have chemical properties varying with depth below macroscopic surfaces prepared by sequences of chemical treatments. <span class="hlt">Porous</span> glass or silica bead treated to make two depth zones having different chemical properties. Beads dropped along tube filled with flowing gas containing atomic oxygen, generated in microwave discharge. General class of materials treatable include oxides of aluminum, silicon, zirconium, tin, titanium, and nickel, and mixtures of these oxides. Potential uses of treated materials include chromatographic separations, membrane separations, controlled releases of chemicals, and catalysis.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/416137','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/416137"><span id="translatedtitle"><span class="hlt">Porous</span> silicon gettering</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Tsuo, Y.S.; Menna, P.; Pitts, J.R.</p> <p>1996-05-01</p> <p>The authors have studied a novel extrinsic gettering method that uses the large surface areas produced by a <span class="hlt">porous</span>-silicon etch as gettering sites. The annealing step of the gettering used a high-flux solar furnace. They found that a high density of photons during annealing enhanced the impurity diffusion to the gettering sites. The authors used metallurgical-grade Si (MG-Si) prepared by directional solidification casing as the starting material. They propose to use <span class="hlt">porous</span>-silicon-gettered MG-Si as a low-cost epitaxial substrate for polycrystalline silicon thin-film growth.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1289998','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1289998"><span id="translatedtitle"><span class="hlt">Porous</span> block nanofiber composite filters</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Ginley, David S.; Curtis, Calvin J.; Miedaner, Alexander; Weiss, Alan J.; Paddock, Arnold</p> <p>2016-08-09</p> <p><span class="hlt">Porous</span> block nano-fiber composite (110), a filtration system (10) and methods of using the same are disclosed. An exemplary <span class="hlt">porous</span> block nano-fiber composite (110) includes a <span class="hlt">porous</span> block (100) having one or more pores (200). The <span class="hlt">porous</span> block nano-fiber composite (110) also includes a plurality of inorganic nano-fibers (211) formed within at least one of the pores (200).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014WRR....50.3933A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014WRR....50.3933A"><span id="translatedtitle">Analysis of the <span class="hlt">impact</span> of surface layer properties on evaporation from <span class="hlt">porous</span> systems using column experiments and modified definition of characteristic length</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Assouline, Shmuel; Narkis, Kfir; Gherabli, Rivka; Lefort, Philippe; Prat, Marc</p> <p>2014-05-01</p> <p>The hydraulic properties of the layer at the vicinity of the soil surface have significant <span class="hlt">impact</span> on evaporation and could be harnessed to reduce water losses. The effect of the properties of the upper layer on the evolution of phase distribution during the evaporation process is first illustrated from three-dimensional pore network simulations. This effect is then studied from experiments carried out on soil columns under laboratory conditions. Comparisons between homogeneous columns packed with coarse (sand) and fine (sandy loam) materials and heterogeneous columns packed with layers of fine overlying coarse material and coarse overlying fine material of different thicknesses are performed to assess the <span class="hlt">impact</span> of upper layer properties on evaporation. Experiments are analyzed using the classical approach based on the numerical solution of Richards equation and semianalytical theoretical predictions. The theoretical analysis is based on the clear distinction between two drying regimes, namely, the capillary regime and the gravity-capillary regime, which are the prevailing regimes in our experiments. Simple relationships enabling to estimate the duration of stage 1 evaporation (S1) for both regimes are proposed. In particular, this led to defining the characteristic length for the gravity-capillary regime from the consideration of viscous effects at low water content differently from available expressions. The duration of S1, during which most of the water losses occur, for both the homogeneous and two-layer columns is presented and discussed. Finally, the <span class="hlt">impact</span> of liquid films and its consequences on the soil hydraulic conductivity function are briefly discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/757583','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/757583"><span id="translatedtitle">A rigid <span class="hlt">porous</span> filter and filtration method</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Chiang, Ta-Kuan; Straub, Douglas, Straub L.; Dennis, Richard A.</p> <p>1998-12-01</p> <p>The present invention <span class="hlt">involves</span> a <span class="hlt">porous</span> rigid filter comprising a plurality of concentric filtration elements having internal flow passages and forming external flow passages there between. The present invention also <span class="hlt">involves</span> a pressure vessel containing the filter for the removal of particulate from high pressure particulate containing gases, and further <span class="hlt">involves</span> a method for using the filter to remove such particulate. The present filter has the advantage of requiring fewer filter elements due to the high surface area- to-volume ratio provided by the filter, requires a reduced pressure vessel size, and exhibits enhanced mechanical design properties, improved cleaning properties, configuration options, modularity and ease of fabrication.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li class="active"><span>9</span></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_9 --> <div id="page_10" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li class="active"><span>10</span></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="181"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3796997','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3796997"><span id="translatedtitle"><span class="hlt">Porous</span> metal for orthopedics implants</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Matassi, Fabrizio; Botti, Alessandra; Sirleo, Luigi; Carulli, Christian; Innocenti, Massimo</p> <p>2013-01-01</p> <p>Summary <span class="hlt">Porous</span> metal has been introduced to obtain biological fixation and improve longevity of orthopedic implants. The new generation of <span class="hlt">porous</span> metal has intriguing characteristics that allows bone healing and high osteointegration of the metallic implants. This article gives an overview about biomaterials properties of the contemporary class of highly <span class="hlt">porous</span> metals and about the clinical use in orthopaedic surgery. PMID:24133527</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26500837','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26500837"><span id="translatedtitle">Analysis by a highly sensitive split luciferase assay of the regions <span class="hlt">involved</span> in APP dimerization and its <span class="hlt">impact</span> on processing.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Decock, Marie; El Haylani, Laetitia; Stanga, Serena; Dewachter, Ilse; Octave, Jean-Noël; Smith, Steven O; Constantinescu, Stefan N; Kienlen-Campard, Pascal</p> <p>2015-01-01</p> <p>Alzheimer's disease (AD) is a neurodegenerative disease that causes progressive loss of cognitive functions, leading to dementia. Two types of lesions are found in AD brains: neurofibrillary tangles and senile plaques. The latter are composed mainly of the β-amyloid peptide (Aβ) generated by amyloidogenic processing of the amyloid precursor protein (APP). Several studies have suggested that dimerization of APP is closely linked to Aβ production. Nevertheless, the mechanisms controlling APP dimerization and their role in APP function are not known. Here we used a new luciferase complementation assay to analyze APP dimerization and unravel the <span class="hlt">involvement</span> of its three major domains: the ectodomain, the transmembrane domain and the intracellular domain. Our results indicate that within cells full-length APP dimerizes more than its α and β C-terminal fragments, confirming the pivotal role of the ectodomain in this process. Dimerization of the APP transmembrane (TM) domain has been reported to regulate processing at the γ-cleavage site. We show that both non-familial and familial AD mutations in the TM GXXXG motifs strongly modulate Aβ production, but do not consistently change dimerization of the C-terminal fragments. Finally, we found for the first time that removal of intracellular domain strongly increases APP dimerization. Increased APP dimerization is linked to increased non-amyloidogenic processing. PMID:26500837</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22011916','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22011916"><span id="translatedtitle">NUMERICAL MODELING OF THE 2009 <span class="hlt">IMPACT</span> EVENT ON JUPITER</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Pond, Jarrad W. T.; Palotai, Csaba; Gabriel, Travis; Harrington, Joseph; Rebeli, Noemi; Korycansky, Donald G.</p> <p>2012-02-01</p> <p>We have investigated the 2009 July <span class="hlt">impact</span> event on Jupiter using the ZEUS-MP 2 three-dimensional hydrodynamics code. We studied the <span class="hlt">impact</span> itself and the following plume development. Eight impactors were considered: 0.5 km and 1 km <span class="hlt">porous</span> ({rho} = 1.760 g cm{sup -3}) and non-<span class="hlt">porous</span> ({rho} = 2.700 g cm{sup -3}) basalt impactors, and 0.5 km and 1 km <span class="hlt">porous</span> ({rho} = 0.600 g cm{sup -3}) and non-<span class="hlt">porous</span> ({rho} = 0.917 g cm{sup -3}) ice impactors. The simulations consisted of these bolides colliding with Jupiter at an incident angle of {theta} = 69 Degree-Sign from the vertical and with an <span class="hlt">impact</span> velocity of v = 61.4 km s{sup -1}. Our simulations show the development of relatively larger, faster plumes created after <span class="hlt">impacts</span> <span class="hlt">involving</span> 1 km diameter bodies. Comparing simulations of the 2009 event with simulations of the Shoemaker-Levy 9 (SL9) events reveals a difference in plume development, with the higher incident angle of the 2009 <span class="hlt">impact</span> leading to a shallower terminal depth and a smaller and slower plume. We also studied the amount of dynamical chaos present in the simulations conducted at the 2009 incident angle. Compared to the chaos of the SL9 simulations, where {theta} Almost-Equal-To 45 Degree-Sign , we find no significant difference in chaos at the higher 2009 incident angle.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/27087103','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27087103"><span id="translatedtitle">Study investigating the <span class="hlt">impact</span> of pharmacist <span class="hlt">involvement</span> on the outcomes of diabetes medication therapy adherence program Malaysia.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Lim, Phei Ching; Lim, Kelvin; Embee, Zubaidah Che; Hassali, Mohamed Azmi; Thiagarajan, Anuradha; Khan, Tahir Mehmood</p> <p>2016-03-01</p> <p><span class="hlt">Involvement</span> of pharmacists in improving medication adherence among diabetic patients is recognized globally. In Malaysian healthcare system, pharmacists are also operating health services i.e. Diabetes Medication Therapy Adherence Clinic (DMTAC). This study aimed to assess the clinical outcomes of patients managed by pharmacists (DMTAC), in a Malaysian hospital setting. This was an open labelled randomised study. Type 2 diabetes patients with HbA1c ≥8% were recruited and arbitrarily divided into the intervention group (usual care plus DMTAC) and the non-intervention group (usual care only). Those enrolled in the intervention group were scheduled for follow-up for eight consecutive visits. Improvements in lab results were compared longitudinally (pre and post analysis) between the groups. Data analysis was done using PASW 18® version. A total of 76 patients were enrolled, with 39 patients in the intervention group and 37 patients in the non-intervention group. Mean HbA1c (-0.90% vs. -0.08%, p=0.011) and fasting blood glucose levels (-3.45 mmol.l vs. +0.79 mmol/l, p=0.002) reduced significantly between the intervention group vs. non-intervention group. Total cholesterol and low-density lipoprotein cholesterol (LDL-C) were also significantly reduced in the intervention group (TC -0.34 mmol/l, p=0.018) (LDL -0.45 mmol/l, p=0.001). In conclusion, pharmacists managed DMTAC significantly improved glycaemic control and lipid profile of diabetic patients. PMID:27087103</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6370269','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/biblio/6370269"><span id="translatedtitle"><span class="hlt">Porous</span> metallic bodies</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Landingham, R.L.</p> <p>1984-03-13</p> <p><span class="hlt">Porous</span> metallic bodies having a substantially uniform pore size of less than about 200 microns and a density of less than about 25 percent theoretical, as well as the method for making them, are disclosed. Group IIA, IIIB, IVB, VB, and rare earth metal hydrides a</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19950065537&hterms=hydrophobic&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dhydrophobic','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19950065537&hterms=hydrophobic&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dhydrophobic"><span id="translatedtitle">Hydrophobic, <span class="hlt">Porous</span> Battery Boxes</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Bragg, Bobby J.; Casey, John E., Jr.</p> <p>1995-01-01</p> <p>Boxes made of <span class="hlt">porous</span>, hydrophobic polymers developed to contain aqueous potassium hydroxide electrolyte solutions of zinc/air batteries while allowing air to diffuse in as needed for operation. Used on other types of batteries for in-cabin use in which electrolytes aqueous and from which gases generated during operation must be vented without allowing electrolytes to leak out.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=39318&keyword=toner&actType=&TIMSType=+&TIMSSubTypeID=&DEID=&epaNumber=&ntisID=&archiveStatus=Both&ombCat=Any&dateBeginCreated=&dateEndCreated=&dateBeginPublishedPresented=&dateEndPublishedPresented=&dateBeginUpdated=&dateEndUpdated=&dateBeginCompleted=&dateEndCompleted=&personID=&role=Any&journalID=&publisherID=&sortBy=revisionDate&count=50&CFID=62107895&CFTOKEN=54106942','EPA-EIMS'); return false;" href="http://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=39318&keyword=toner&actType=&TIMSType=+&TIMSSubTypeID=&DEID=&epaNumber=&ntisID=&archiveStatus=Both&ombCat=Any&dateBeginCreated=&dateEndCreated=&dateBeginPublishedPresented=&dateEndPublishedPresented=&dateBeginUpdated=&dateEndUpdated=&dateBeginCompleted=&dateEndCompleted=&personID=&role=Any&journalID=&publisherID=&sortBy=revisionDate&count=50&CFID=62107895&CFTOKEN=54106942"><span id="translatedtitle"><span class="hlt">POROUS</span> DIKE INTAKE EVALUATION</span></a></p> <p><a target="_blank" href="http://oaspub.epa.gov/eims/query.page">EPA Science Inventory</a></p> <p></p> <p></p> <p>The report gives results of an evaluation of a <span class="hlt">porous</span> dike intake. A small-scale test facility was constructed and continuously operated for 2 years under field conditions. Two stone dikes of gabion construction were tested: one consisted of 7.5 cm stones; and the other, 20 cm st...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22056354','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22056354"><span id="translatedtitle">The <span class="hlt">Impact</span> of Extent and Location of Mediastinal Lymph Node <span class="hlt">Involvement</span> on Survival in Stage III Non-Small Cell Lung Cancer Patients Treated With Definitive Radiotherapy</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Fernandes, Annemarie T.; Mitra, Nandita; Xanthopoulos, Eric; Evans, Tracey; Stevenson, James; Langer, Corey; Kucharczuk, John C.; Lin, Lilie; Rengan, Ramesh</p> <p>2012-05-01</p> <p>Purpose: Several surgical series have identified subcarinal, contralateral, and multilevel nodal <span class="hlt">involvement</span> as predictors of poor overall survival in patients with Stage III non-small-cell lung cancer (NSCLC) treated with definitive resection. This retrospective study evaluates the <span class="hlt">impact</span> of extent and location of mediastinal lymph node (LN) <span class="hlt">involvement</span> on survival in patients with Stage III NSCLC treated with definitive radiotherapy. Methods and Materials: We analyzed 106 consecutive patients with T1-4 N2-3 Stage III NSCLC treated with definitive radiotherapy at University of Pennsylvania between January 2003 and February 2009. For this analysis, mediastinal LN stations were divided into four mutually exclusive groups: supraclavicular, ipsilateral mediastinum, contralateral mediastinum, and subcarinal. Patients' conditions were then analyzed according to the extent of <span class="hlt">involvement</span> and location of mediastinal LN stations. Results: The majority (88%) of patients received sequential or concurrent chemotherapy. The median follow-up time for survivors was 32.6 months. By multivariable Cox modeling, chemotherapy use (hazard ratio [HR]: 0.21 [95% confidence interval (CI): 0.07-0.63]) was associated with improved overall survival. Increasing primary tumor [18F]-fluoro-2-deoxy-glucose avidity (HR: 1.11 [CI: 1.06-1.19]), and subcarinal <span class="hlt">involvement</span> (HR: 2.29 [CI: 1.11-4.73]) were significant negative predictors of overall survival. On univariate analysis, contralateral nodal <span class="hlt">involvement</span> (HR: 0.70 [CI: 0.33-1.47]), supraclavicular nodal <span class="hlt">involvement</span> (HR: 0.78 [CI: 0.38-1.67]), multilevel nodal <span class="hlt">involvement</span> (HR: 0.97 [CI: 0.58-1.61]), and tumor size (HR: 1.04 [CI: 0.94-1.14]) did not predict for overall survival. Patients with subcarinal <span class="hlt">involvement</span> also had lower rates of 2-year nodal control (51.2% vs. 74.9%, p = 0.047) and 2-year distant control (28.4% vs. 61.2%, p = 0.043). Conclusions: These data suggest that the factors that determine oncologic outcome in Stage III NSCLC</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/19437439','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/19437439"><span id="translatedtitle">Bone ingrowth into <span class="hlt">porous</span> silicon nitride.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Anderson, M C; Olsen, R</p> <p>2010-03-15</p> <p>Achieving solid skeletal attachment is a requirement for the clinical success of orthopedic implants. <span class="hlt">Porous</span> or roughened surfaces and coatings have been developed and used with mixed success to achieve attachment due to bone ingrowth. Silicon nitride is a high performance ceramic whose strength, imaging properties, and biocompatibility make it a candidate material for orthopedic implants. A <span class="hlt">porous</span> form of silicon nitride, cancellous-structured ceramic (CSC), has been developed. CSC is a nonresorbable, partially radiolucent <span class="hlt">porous</span> structure that can be bonded to orthopedic implants made of silicon nitride to facilitate skeletal attachment. The purpose of this study was to quantify the extent and rate of bone ingrowth into CSC in a large animal model. Cylindrical implants were placed bilaterally using staged surgeries in the medial femoral condyle of six sheep. Condyles were retrieved after 3 and 6 months in situ and prepared for examination of bone growth under SEM. Bone grew into CSC to extents and at rates similar to those reported for other titanium <span class="hlt">porous</span> surfaces in studies <span class="hlt">involving</span> large animals and postmortem retrievals in humans. Bone ingrowth was observed at depths of penetration greater than 3 mm in some implants after only 12 weeks in situ. Bone ingrowth into CSC is a viable method for achieving skeletal attachment. PMID:19437439</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/927603','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/927603"><span id="translatedtitle">SRNL <span class="hlt">POROUS</span> WALL GLASS MICROSPHERES</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Wicks, G; Leung Heung, L; Ray Schumacher, R</p> <p>2008-04-15</p> <p>The Savannah River National Laboratory (SRNL) has developed a new medium for storage of hydrogen and other gases. This <span class="hlt">involves</span> fabrication of thin, <span class="hlt">Porous</span> Walled, Hollow Glass Microspheres (PW-HGMs), with diameters generally in the range of 1 to several hundred microns. What is unique about the glass microballons is that porosity has been induced and controlled within the thin, one micron thick walls, on the scale of 10 to several thousand Angstroms. This porosity results in interesting properties including the ability to use these channels to fill the microballons with special absorbents and other materials, thus providing a contained environment even for reactive species. Gases can now enter the microspheres and be retained on the absorbents, resulting in solid-state and contained storage of even reactive species. Also, the porosity can be altered and controlled in various ways, and even used to filter mixed gas streams within a system. SRNL is <span class="hlt">involved</span> in about a half dozen different programs <span class="hlt">involving</span> these PW-HGMs and an overview of some of these activities and results emerging are presented.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/244573','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/244573"><span id="translatedtitle">Small scale flow processes in aqueous heterogeneous <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Rashidi, M.; Dickenson, E.</p> <p>1996-04-01</p> <p>Small scale flow processes in aqueous heterogeneous <span class="hlt">porous</span> systems have been studied experimentally via novel nonintrusive fluorescence imaging techniques. The techniques <span class="hlt">involve</span> 3D visualization and quantification of flow fields within a refractive index-matched transparent <span class="hlt">porous</span> column. The refractive index-matching yields a transparent <span class="hlt">porous</span> medium, free from any scattering and refraction at the solid-liquid interfaces, as a result allowing direct optical probing at any point within the <span class="hlt">porous</span> system. By illuminating the <span class="hlt">porous</span> regions within the column with a planar sheet of laser beam, flow processes through the <span class="hlt">porous</span> medium can be observed microscopically, and qualitative and quantitative in-pore transport information can be obtained at a good resolution and a good accuracy. A CCD camera is used to record the fluorescent images at every vertical plane location while sweeping back and forth across the column. These digitized flow images are then analyzed and accumulated over a 3D volume within the column. Series of flow experiments in aqueous, refractive index-matched, <span class="hlt">porous</span> systems packed with natural mineral particles have been performed successfully in these laboratories.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2003PhDT........23Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2003PhDT........23Z"><span id="translatedtitle"><span class="hlt">Porous</span> bioactive materials</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhang, Kai</p> <p></p> <p>Bioactive materials chemically bond to tissues through the development of biologically active apatite. <span class="hlt">Porous</span> structures in biomaterials are designed to enhance bioactivity, grow artificial tissues and achieve better integration with host tissues in the body. The goal of this research is to design, fabricate and characterize novel <span class="hlt">porous</span> bioactive materials. 3D ordered macroporous bioactive glasses (3DOM-BGs, pore size: 200--1000 nm) were prepared using a sol-gel process and colloidal crystal templates. 3DOM-BGs are more bioactive and degradable than mesoporous (pore size <50 nm) sol-gel BGs in simulated body fluid (SBF). Apatite formation and 3DOM-BG degradation rates increased with the decrease of soaking ratio. Apatite induction time in SBF increased with 3DOM-BG calcination temperature (600--800°C). Apatite formation and 3DOMBG degradation were slightly enhanced for a phosphate containing composition. Large 3DOM-BG particles formed less apatite and degraded less completely as compared with small particles. An increase in macropore size slowed down 3DOM-BG degradation and apatite formation processes. After heating the converted apatite at a temperature higher than 700°C, highly crystalline hydroxyapatite and a minor tri-calcium phosphate phase formed. 3DOM-BGs have potential applications as bone/periodontal fillers, and drugs and biological factors delivery agents. Anchoring artificial soft tissues (e.g., cartilage) to native bone presents a challenge. <span class="hlt">Porous</span> polymer/bioactive glass composites are candidate materials for engineering artificial soft tissue/bone interfaces. <span class="hlt">Porous</span> composites consisting of polymer matrices (e.g., polysulfone, polylactide, and polyurethane) and bioactive glass particles were prepared by polymer phase separation techniques adapted to include ceramic particles. Composites (thickness: 200--500 mum) have asymmetric structures with dense top layers and <span class="hlt">porous</span> structures beneath. <span class="hlt">Porous</span> structures consist of large pores (>100 mum) in a</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4377735','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4377735"><span id="translatedtitle">The <span class="hlt">impact</span> of patients’ <span class="hlt">involvement</span> in cooking on their mortality and morbidity: A 19-year follow-up of patients diagnosed with type 2 diabetes mellitus</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Siersma, Volkert; Køster-Rasmussen, Rasmus; Olivarius, Niels De Fine; Waldorff, Frans Boch</p> <p>2015-01-01</p> <p>Abstract Objective. This study explored the <span class="hlt">impact</span> of <span class="hlt">involvement</span> in cooking on long-term morbidity and mortality among patients newly diagnosed with type 2 diabetes mellitus (T2DM). Design and subjects. Data are from the population-based study Diabetes Care in General Practice. In baseline questionnaires, 1348 patients newly diagnosed with T2DM gave information on how frequently they consumed a warm main meal and how often they cooked it themselves. The selected patients were followed up for 19 years in the Danish National Patient Registry and the Danish Register of Causes of Death. Main outcome measures. This study analysed the association between <span class="hlt">involvement</span> in cooking and each of seven pre-specified outcomes was analysed in Cox regression models with stepwise adjustment for possible confounders and mediators. Results. 92% of the patients with T2DM consumed a warm main meal = five times per week. Among these, women who cooked for themselves less than once a week had a higher risk of diabetes-related deaths (HR 1.86 [95% CI 1.03–3.35], p = 0.039) and stroke (HR 2.47 [95% CI 1.08–5.65], p = 0.033), after adjustment for confounders. For men, infrequent cooking was not related to increased risk for the outcomes investigated. Conclusions. In patients newly diagnosed with T2DM and with a regular intake of warm main meals, infrequent <span class="hlt">involvement</span> in cooking was associated with an increased risk of diabetes-related death and stroke for women, but not for men. General practitioners should pay special attention to managing diabetes treatment in female patients newly diagnosed with T2DM who report infrequent <span class="hlt">involvement</span> in cooking. PMID:25592166</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012JSV...331.5292O','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012JSV...331.5292O"><span id="translatedtitle">On the sensitivity analysis of <span class="hlt">porous</span> material models</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ouisse, Morvan; Ichchou, Mohamed; Chedly, Slaheddine; Collet, Manuel</p> <p>2012-11-01</p> <p><span class="hlt">Porous</span> materials are used in many vibroacoustic applications. Different available models describe their behaviors according to materials' intrinsic characteristics. For instance, in the case of <span class="hlt">porous</span> material with rigid frame, and according to the Champoux-Allard model, five parameters are employed. In this paper, an investigation about this model sensitivity to parameters according to frequency is conducted. Sobol and FAST algorithms are used for sensitivity analysis. A strong parametric frequency dependent hierarchy is shown. Sensitivity investigations confirm that resistivity is the most influent parameter when acoustic absorption and surface impedance of <span class="hlt">porous</span> materials with rigid frame are considered. The analysis is first performed on a wide category of <span class="hlt">porous</span> materials, and then restricted to a polyurethane foam analysis in order to illustrate the <span class="hlt">impact</span> of the reduction of the design space. In a second part, a sensitivity analysis is performed using the Biot-Allard model with nine parameters including mechanical effects of the frame and conclusions are drawn through numerical simulations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/7008502','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/biblio/7008502"><span id="translatedtitle"><span class="hlt">Porous</span> electrode preparation method</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Arons, R.M.; Dusek, J.T.</p> <p>1983-10-18</p> <p>A <span class="hlt">porous</span> sintered plaque is provided with a bimodal porosity that is especially well suited for use as an electrode within a molten carbonate fuel cell. The coarse porosity is sufficient for admitting gases into contact with the reaction surfaces while the fine porosity is wetted with and retains molten electrolyte on the reaction sites. The electrode structure is prepared by providing a very fine powder of such as nickel oxide and blending the powder with a suitable decomposable binder to form a solid mass. The mass is comminuted into agglomerate size particles substantially larger than the fine oxide particles and formed into a cohesive compact for subsequent sintering. Sintering is carried out at sufficient conditions to bind the agglomerates together into a <span class="hlt">porous</span> structure having both coarse and fine porosity. Where lithiated nickel oxide cathodes are prepared, the sintering conditions can be moderate enough to retain substantial quantities of lithium within the electrode for adequate conductivity. 2 figs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/864745','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/864745"><span id="translatedtitle"><span class="hlt">Porous</span> electrode preparation method</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Arons, Richard M.; Dusek, Joseph T.</p> <p>1983-01-01</p> <p>A <span class="hlt">porous</span> sintered plaque is provided with a bimodal porosity that is especially well suited for use as an electrode within a molten carbonate fuel cell. The coarse porosity is sufficient for admitting gases into contact with the reaction surfaces while the fine porosity is wetted with and retains molten electrolyte on the reaction sites. The electrode structure is prepared by providing a very fine powder of such as nickel oxide and blending the powder with a suitable decomposable binder to form a solid mass. The mass is comminuted into agglomerate size particles substantially larger than the fine oxide particles and formed into a cohesive compact for subsequent sintering. Sintering is carried out at sufficient conditions to bind the agglomerates together into a <span class="hlt">porous</span> structure having both coarse and fine porosity. Where lithiated nickel oxide cathodes are prepared, the sintering conditions can be moderate enough to retain substantial quantities of lithium within the electrode for adequate conductivity.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/874843','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/874843"><span id="translatedtitle"><span class="hlt">Porous</span> polymer media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Shepodd, Timothy J.</p> <p>2002-01-01</p> <p>Highly crosslinked monolithic <span class="hlt">porous</span> polymer materials for chromatographic applications. By using solvent compositions that provide not only for polymerization of acrylate monomers in such a fashion that a <span class="hlt">porous</span> polymer network is formed prior to phase separation but also for exchanging the polymerization solvent for a running buffer using electroosmotic flow, the need for high pressure purging is eliminated. The polymer materials have been shown to be an effective capillary electrochromatographic separations medium at lower field strengths than conventional polymer media. Further, because of their highly crosslinked nature these polymer materials are structurally stable in a wide range of organic and aqueous solvents and over a pH range of 2-12.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20100011118','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20100011118"><span id="translatedtitle">Strong, Lightweight, <span class="hlt">Porous</span> Materials</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Leventis, Nicholas; Meador, Mary Ann B.; Johnston, James C.; Fabrizio, Eve F.; Ilhan, Ulvi</p> <p>2007-01-01</p> <p>A new class of strong, lightweight, <span class="hlt">porous</span> materials has been invented as an outgrowth of an effort to develop reinforced silica aerogels. The new material, called X-Aerogel is less hygroscopic, but no less <span class="hlt">porous</span> and of similar density to the corresponding unmodified aerogels. However, the property that sets X-Aerogels apart is their mechanical strength, which can be as much as two and a half orders of magnitude stronger that the unmodified aerogels. X-Aerogels are envisioned to be useful for making extremely lightweight, thermally insulating, structural components, but they may also have applications as electrical insulators, components of laminates, catalyst supports, templates for electrode materials, fuel-cell components, and filter membranes.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/377002','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/377002"><span id="translatedtitle">Determination of the heat transfer coefficients in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kim, L.V.</p> <p>1994-06-01</p> <p>The process of transpiration cooling is considered. Methods are suggested for estimating the volumetric coefficient of heat transfer with the use of a two-temperature model and the surface heat transfer coefficient at entry into a <span class="hlt">porous</span> wall. The development of new technology under conditions of increasing heat loads puts the search for effective methods of heat transfer enhancement in the forefront of theoretical investigations. One of the promising trends in the solution of this problem is the use of <span class="hlt">porous</span> materials (PM) in the elements of power units. For thermal protection against convective or radiative heat fluxes, the method of transpiration cooling is successfully used. The mechanism operative in the thermal protection <span class="hlt">involves</span> the injection of a coolant through a <span class="hlt">porous</span> medium to produce a screen over the contour of a body in a flow for removing heat energy from the skeleton of the <span class="hlt">porous</span> material.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/18614698','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/18614698"><span id="translatedtitle">Posttraumatic stress disorder and social support in female victims of sexual assault: the <span class="hlt">impact</span> of spousal <span class="hlt">involvement</span> on the efficacy of cognitive-behavioral therapy.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Billette, Valérie; Guay, Stéphane; Marchand, André</p> <p>2008-11-01</p> <p>The goal of this study is to enhance the efficacy of CBT with victims of sexual assault suffering from PTSD by getting the spouse <span class="hlt">involved</span>. Thus, in addition to attempting to reduce PTSD symptoms, the therapy focuses on improving the support offered by the spouse and favors management of the <span class="hlt">impact</span> of the traumatic event within the couple. A single-case, multiple-baseline across-subjects design is used. Three victims of sexual assault with a diagnosis of PTSD participated in the study. Results at posttreatment and at 3-month follow-up are promising. None of the participants presents a diagnosis of PTSD, and all report a significant improvement in their satisfaction with the support received from their spouses. PMID:18614698</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li class="active"><span>10</span></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_10 --> <div id="page_11" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li class="active"><span>11</span></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="201"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015APS..DFD.H1001M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015APS..DFD.H1001M"><span id="translatedtitle">Uniaxial deformation of a soft <span class="hlt">porous</span> material</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>MacMinn, Chris; Dufresne, Eric; Wettlaufer, John</p> <p>2015-11-01</p> <p>Compressing a <span class="hlt">porous</span> material will decrease the volume of pore space, driving fluid out. Similarly, injecting fluid into a <span class="hlt">porous</span> material will drive mechanical deformation, distorting the solid skeleton. This poromechanical coupling has applications ranging from cell and tissue mechanics to geomechanics and hydrogeology. The classical theory of linear poroelasticity captures this coupling by combining Darcy's law with linear elasticity and then further linearizing in the strain. This is a good model for very small deformations, but it becomes increasingly inappropriate as deformations grow larger, and moderate to large deformations are common in the context of phenomena such as swelling, damage, and extreme softness. Here, we compare the predictions of linear poroelasticity with those of a rigorous large-deformation framework in the context of two uniaxial model problems. We explore the error associated with the linear model in both steady and dynamic situations, as well as the <span class="hlt">impact</span> of allowing the permeability to vary with the deformation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6730037','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6730037"><span id="translatedtitle">Natural convection in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Prasad, V.; Hussain, N.A.</p> <p>1986-01-01</p> <p>This book presents the papers given at a conference on free convection in <span class="hlt">porous</span> materials. Topics considered at the conference included heat transfer, nonlinear temperature profiles and magnetic fields, boundary conditions, concentrated heat sources in stratified <span class="hlt">porous</span> media, free convective flow in a cavity, heat flux, laminar mixed convection flow, and the onset of convection in a <span class="hlt">porous</span> medium with internal heat generation and downward flow.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3600995','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3600995"><span id="translatedtitle"><span class="hlt">Porous</span> microsphere and its applications</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Cai, Yunpeng; Chen, Yinghui; Hong, Xiaoyun; Liu, Zhenguo; Yuan, Weien</p> <p>2013-01-01</p> <p><span class="hlt">Porous</span> microspheres have drawn great attention in the last two decades for their potential applications in many fields, such as carriers for drugs, absorption and desorption of substances, pulmonary drug delivery, and tissue regeneration. The application of <span class="hlt">porous</span> microspheres has become a feasible way to address existing problems. In this essay, we give a brief introduction of the <span class="hlt">porous</span> microsphere, its characteristics, preparation methods, applications, and a brief summary of existing problems and research tendencies. PMID:23515359</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19960009264','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19960009264"><span id="translatedtitle">Selective formation of <span class="hlt">porous</span> silicon</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Fathauer, Robert W. (Inventor); Jones, Eric W. (Inventor)</p> <p>1993-01-01</p> <p>A pattern of <span class="hlt">porous</span> silicon is produced in the surface of a silicon substrate by forming a pattern of crystal defects in said surface, preferably by applying an ion milling beam through openings in a photoresist layer to the surface, and then exposing said surface to a stain etchant, such as HF:HNO3:H2O. The defected crystal will preferentially etch to form a pattern of <span class="hlt">porous</span> silicon. When the amorphous content of the <span class="hlt">porous</span> silicon exceeds 70 percent, the <span class="hlt">porous</span> silicon pattern emits visible light at room temperature.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19940011487','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19940011487"><span id="translatedtitle">Selective formation of <span class="hlt">porous</span> silicon</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Fathauer, Jones (Inventor)</p> <p>1993-01-01</p> <p>A pattern of <span class="hlt">porous</span> silicon is produced in the surface of a silicon substrate by forming a pattern of crystal defects in said surface, preferably by applying an ion milling beam through openings in a photoresist layer to the surface, and then exposing said surface to a stain etchant, such as HF:HNO3:H20. The defected crystal will preferentially etch to form a pattern of <span class="hlt">porous</span> silicon. When the amorphous content of the <span class="hlt">porous</span> silicon exceeds 70 percent, the <span class="hlt">porous</span> silicon pattern emits visible light at room temperature.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/22287819','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/22287819"><span id="translatedtitle">Analysis of the <span class="hlt">impact</span> of professional <span class="hlt">involvement</span> in evidence generation for the HTA Process, subproject "cochlear implants": methodology, results and recommendations.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Berrettini, S; Arslan, E; Baggiani, A; Burdo, S; Cassandro, E; Cuda, D; Filipo, R; Rossi, P Giorgi; Mancini, P; Martini, A; Quaranta, A; Quaranta, N; Turchetti, G; Forli, F</p> <p>2011-10-01</p> <p>The aim of Health Technology Assessment (HTA) is to provide decision-makers, distributors and recipients with information on the effectiveness, cost and <span class="hlt">impact</span> of health technologies. The present study constitutes a subproject within the wider project "Analysis of the <span class="hlt">impact</span> of professional <span class="hlt">involvement</span> in evidence generation for the HTA process", which is part of the strategic programme "Transfer of the results of the research in clinical practice and organisation of healthcare services", coordinated by Laziosanità - Agency of Public Healthcare of the Lazio Region and AgeNaS (National Agency for Regional Healthcare Services). The objectives of the present subproject (cochlear implants) are as follows: a) to produce a report regarding the health <span class="hlt">impact</span> of cochlear implants (CI) on their recipients, through a systematic review of literature and extensive selection of relative studies, combining the outcomes with metanalytical techniques. Output: report on the indications of usage in the groups of population for which benefits are controversial; b) to create a registry of patients using cochlear implants. The registry should contain a selection of anagraphic and clinical information relative to patient follow-up in order to assess factors associated with safety and <span class="hlt">impact</span> on cochlear implant users. This source of information is essential for future observational studies. This was divided into 4 phases: 1(st) phase: definition of key participants in the assessment process; 2(nd) phase: definition of methods and timing of "Aims" (definition of the objective); 3(rd) phase: definition of the methods and times of the "assessment process", 4(th) phase: production of the final report. From the analysis of systematic reviews and italian and international guidelines, the Working Group members approved recommendations on the following topics: results after CI in children in relation to age at implantation, bilateral CI in children, CI in deaf children with associated</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22122787','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22122787"><span id="translatedtitle">Amorphization and reduction of thermal conductivity in <span class="hlt">porous</span> silicon by irradiation with swift heavy ions</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Newby, Pascal J.; Canut, Bruno; Bluet, Jean-Marie; Lysenko, Vladimir; Gomes, Severine; Isaiev, Mykola; Burbelo, Roman; Chantrenne, Patrice; Frechette, Luc G.</p> <p>2013-07-07</p> <p>In this article, we demonstrate that the thermal conductivity of nanostructured <span class="hlt">porous</span> silicon is reduced by amorphization and also that this amorphous phase in <span class="hlt">porous</span> silicon can be created by swift (high-energy) heavy ion irradiation. <span class="hlt">Porous</span> silicon samples with 41%-75% porosity are irradiated with 110 MeV uranium ions at six different fluences. Structural characterisation by micro-Raman spectroscopy and SEM imaging show that swift heavy ion irradiation causes the creation of an amorphous phase in <span class="hlt">porous</span> Si but without suppressing its <span class="hlt">porous</span> structure. We demonstrate that the amorphization of <span class="hlt">porous</span> silicon is caused by electronic-regime interactions, which is the first time such an effect is obtained in crystalline silicon with single-ion species. Furthermore, the <span class="hlt">impact</span> on the thermal conductivity of <span class="hlt">porous</span> silicon is studied by micro-Raman spectroscopy and scanning thermal microscopy. The creation of an amorphous phase in <span class="hlt">porous</span> silicon leads to a reduction of its thermal conductivity, up to a factor of 3 compared to the non-irradiated sample. Therefore, this technique could be used to enhance the thermal insulation properties of <span class="hlt">porous</span> Si. Finally, we show that this treatment can be combined with pre-oxidation at 300 Degree-Sign C, which is known to lower the thermal conductivity of <span class="hlt">porous</span> Si, in order to obtain an even greater reduction.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/15348161','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/15348161"><span id="translatedtitle">Characterization of <span class="hlt">porous</span> hydroxyapatite.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Hing, K A; Best, S M; Bonfield, W</p> <p>1999-03-01</p> <p>Hydroxyapatite has been considered for use in the repair of osseous defects for the last 20 years. Recent developments have led to interest in the potential of <span class="hlt">porous</span> hydroxyapatite as a synthetic bone graft. However, despite considerable activity in this field, regarding assessment of the biological response to such materials, the basic materials characterization is often inadequate. This paper documents the characterization of the chemical composition, mechanical integrity, macro- and microstructure of a <span class="hlt">porous</span> hydroxyapatite, Endobon (E. Merck GmbH), intended for the bone-graft market. Specimens possesed a range of apparent densities from 0.35 to 1.44 g cm(-3). Chemical analysis demonstrated that the natural apatite precursor of Endobon was not converted to pure hydroxyapatite, but retained many of the ionic substituents found in bone mineral, notably carbonate, sodium and magnesium ions. Investigation of the microstructure illustrated that the struts of the material were not fully dense, but had retained some traces of the network of osteocyte lacunae. Macrostructural analysis demonstrated the complex inter-relationship between the structural features of an open pore structure. Both pore size and connectivity were found to be inversely dependent on apparent density. Furthermore, measurement of pore aspect ratio and orientation demonstrated a relationship between apparent density and the degree of macrostructural anisotropy within the specimens, while, it was also noted that pore connectivity was sensitive to anisotropy. Compression testing demonstrated the effect of apparent density and macrostructural anisotropy on the mechanical properties. An increase in apparent density from 0.38 to 1.25 g cm(-3) resulted in increases in ultimate compressive stress and compressive modulus of 1 to 11 MPa and 0.2 to 3.1 GPa, respectively. Furthermore, anisotropic high density (> 0.9 g cm(-3)) specimens were found to possess lower compressive moduli than isotropic specimens</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20080006880','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20080006880"><span id="translatedtitle">Small, <span class="hlt">porous</span> polyacrylate beads</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Rembaum, Alan (Inventor); Yen, Shiao-Ping Siao (Inventor); Dreyer, William J. (Inventor)</p> <p>1976-01-01</p> <p>Uniformly-shaped, <span class="hlt">porous</span>, round beads are prepared by the co-polymerization of an acrylic monomer and a cross-linking agent in the presence of 0.05 to 5% by weight of an aqueous soluble polymer such as polyethylene oxide. Cross-linking proceeds at high temperature above about 50.degree.C or at a lower temperature with irradiation. Beads of even shape and even size distribution of less than 2 micron diameter are formed. The beads will find use as adsorbents in chromatography and as markers for studies of cell surface receptors.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20080006886','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20080006886"><span id="translatedtitle">Crosslinked, <span class="hlt">porous</span>, polyacrylate beads</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Rembaum, Alan (Inventor); Yen, Shiao-Ping Siao (Inventor); Dreyer, William J. (Inventor)</p> <p>1976-01-01</p> <p>Uniformly-shaped, <span class="hlt">porous</span>, round beads are prepared by the co-polymerization of an acrylic monomer and a cross-linking agent in the presence of 0.05 to 5% by weight of an aqueous soluble polymer such as polyethylene oxide. Cross-linking proceeds at high temperature above about 50.degree.C or at a lower temperature with irradiation. Beads of even shape and even size distribution of less than 2 micron diameter are formed. The beads will find use as adsorbents in chromatography and as markers for studies of cell surface receptors.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20080012236','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20080012236"><span id="translatedtitle">Crosslinked, <span class="hlt">porous</span>, polyacrylate beads</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Rembaum, Alan (Inventor); Yen, Shiao-Ping S. (Inventor); Dreyer, William J. (Inventor)</p> <p>1977-01-01</p> <p>Uniformly-shaped, <span class="hlt">porous</span>, round beads are prepared by the co-polymerization of an acrylic monomer and a cross-linking agent in the presence of 0.05 to 5% by weight of an aqueous soluble polymer such as polyethylene oxide. Cross-linking proceeds at high temperature above about 50.degree. C or at a lower temperature with irradiation. Beads of even shape and even size distribution of less than 2 micron diameter are formed. The beads will find use as adsorbents in chromatography and as markers for studies of cell surface receptors.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/10384839','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/10384839"><span id="translatedtitle">Disintegration of <span class="hlt">porous</span> polyethylene prostheses.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kerr, A G; Riley, D N</p> <p>1999-06-01</p> <p>A Plastipore (<span class="hlt">porous</span> polyethylene) Total Ossicular Replacement Prosthesis gave an excellent initial hearing result which was maintained for 14 years. Hearing then began to deteriorate and revision surgery showed disintegration of the prosthesis and a defect in the stapes footplate. Histological examination confirmed previous findings in <span class="hlt">porous</span> polyethylene with multinucleated foreign body giant cells and breakdown of the material. PMID:10384839</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013EGUGA..15.2483W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013EGUGA..15.2483W"><span id="translatedtitle">The in-situ formation of methyl-nitrate during NOx re-cycling <span class="hlt">involving</span> CH3O2: global <span class="hlt">impacts</span> and implications in the troposphere</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Williams, Jason; Le Bras, Georges; Kukui, Alexandre</p> <p>2013-04-01</p> <p>Organic nitrates are formed via chain termination steps <span class="hlt">involving</span> peroxy-radicals and NO thus <span class="hlt">impacting</span> the efficiency of ozone production and global oxidative capacity, especially in low NOx environments (Browne and Cohen, 2012). Recently the direct formation of methyl nitrate (CH3ONO2) has been observed during the re-cycling of NOx by CH3O2 (Butkovskaya et al., 2012) with a branching ratio of 1.0(+/-)0.7% for tropospheric conditions. Considering that the CH3O2 route acts as the second most important radical mechanism of NOx re-cycling at global scale implies that this sequestration of reactive nitrogen into a more long lived reservoir could potentially decrease the efficiency of tropospheric ozone production, especially in the tropical regions where the highest mixing ratios of CH3O2 exist as a result of methane oxidation. Past measurements of alkyl-nitrates have shown that although resident mixing ratios of organic nitrates are high under urban conditions, they are also present in the more pristine regions of the tropical Pacific (e.g. Blake et al, 2003) and above Antarctica (i.e. in low NOx environments). Using the global 3D TM5 model we investigate the <span class="hlt">impact</span> that the direct in-situ formation of CH3ONO2 has on global tropospheric composition. By comparing against measurements we also show that such a process could go part way towards explaining the distribution of CH3ONO2 in the tropical troposphere, where direct emissions from the ocean have previously been used to explain observations (Neu et al, 2008). Browne and Cohen, Atms. Chem. Phys., 12, 11917-11932, 2012. Butkovskaya et al., J. Phys. Chem. A., 116(24), 5972-5980, 2012. Blake et al., J. Geophys. Res., 108(D2), 8242, 2003. Neu et al., Geophys. Res. Letts., 35, L13814, 2008.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/865714','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/865714"><span id="translatedtitle"><span class="hlt">Porous</span> metallic bodies</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Landingham, Richard L.</p> <p>1985-01-01</p> <p><span class="hlt">Porous</span> metallic bodies having a substantially uniform pore size of less than about 200 microns and a density of less than about 25 percent theoretical, as well as the method for making them, are disclosed. Group IIA, IIIB, IVB, VB, and rare earth metal hydrides are heated in a confining container at a controlled rate to a temperature of about greater than the temperature at which the hydride decomposes. Hydrogen is removed from the container and the remaining metal is heated during a second stage to a temperature greater than the temperature at which it was previously heated but not greater than the temperature of 1/2 to 2/3 the temperature at which the metal melts at a controlled rate. The resulting <span class="hlt">porous</span> metallic body produced has a density less than about 25 percent theoretical and a pore size of less than about 200 microns. The metallic particles of the present invention have high inner surface area and possess minimum resistance to gas flow.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19780019129','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19780019129"><span id="translatedtitle">Application of <span class="hlt">porous</span> materials for laminar flow control</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Pearce, W. E.</p> <p>1978-01-01</p> <p>Fairly smooth <span class="hlt">porous</span> materials were elected for study Doweave; Fibermetal; Dynapore; and perforated titanium sheet. Factors examined include: surface smoothness; suction characteristics; porosity; surface <span class="hlt">impact</span> resistance; and strain compatibility. A laminar flow control suction glove arrangement was identified with material combinations compatible with thermal expansion and structural strain.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1981JEP....40..175L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1981JEP....40..175L"><span id="translatedtitle">Mathematical description of the structure of a capillary-<span class="hlt">porous</span> body</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lyashkevich, I. M.; Volchenok, V. F.; Raptunovich, G. S.</p> <p>1981-02-01</p> <p>The properties of a capillary-<span class="hlt">porous</span> disperse body are described and a mathematical model of its structure is constructed. As the model body, gypsum stone, which hardens under conditions of oriented mass transfer <span class="hlt">involving</span> the liquid phase, is selected.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/765956','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/765956"><span id="translatedtitle">Combustion in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Dillon, J.</p> <p>1999-09-01</p> <p>A 2.8-liter tube-shaped combustion vessel was constructed to study flame propagation and quenching in <span class="hlt">porous</span> media. For this experiment, hydrogen-air flames propagating horizontally into abed of 6 mm diameter glass beads were studied. Measurements of pressure and temperature along the length of the tube were used to observe flame propagation of quenching. The critical hydrogen concentration for Hz-air mixtures was found to be 11.5%, corresponding to a critical Peclet number of Pe* = 37. This value is substantially less than the value of Pe* = 65 quoted in the literature, for example Babkin et al. (1991). It is hypothesized that buoyancy and a dependence of Pe on the Lewis number account for the discrepancy between these two results.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014AGUFM.B41L..04H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014AGUFM.B41L..04H"><span id="translatedtitle">Biogenic Cracks in <span class="hlt">Porous</span> Rock</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hemmerle, A.; Hartung, J.; Hallatschek, O.; Goehring, L.; Herminghaus, S.</p> <p>2014-12-01</p> <p>Microorganisms growing on and inside <span class="hlt">porous</span> rock may fracture it by various processes. Some of the mechanisms of biofouling and bioweathering are today identified and partially understood but most emphasis is on chemical weathering, while mechanical contributions have been neglected. However, as demonstrated by the perseverance of a seed germinating and cracking up a concrete block, the turgor pressure of living organisms can be very significant. Here, we present results of a systematic study of the effects of the mechanical forces of growing microbial populations on the weathering of <span class="hlt">porous</span> media. We designed a model <span class="hlt">porous</span> medium made of glass beads held together by polydimethylsiloxane (PDMS), a curable polymer. The rheological properties of the <span class="hlt">porous</span> medium, whose shape and size are tunable, can be controlled by the ratio of crosslinker to base used in the PDMS (see Fig. 1). Glass and PDMS being inert to most chemicals, we are able to focus on the mechanical processes of biodeterioration, excluding any chemical weathering. Inspired by recent measurements of the high pressure (~0.5 Mpa) exerted by a growing population of yeasts trapped in a microfluidic device, we show that yeast cells can be cultured homogeneously within <span class="hlt">porous</span> medium until saturation of the <span class="hlt">porous</span> space. We investigate then the effects of such an inner pressure on the mechanical properties of the sample. Using the same model system, we study also the complex interplay between biofilms and <span class="hlt">porous</span> media. We focus in particular on the effects of pore size on the penetration of the biofilm within the <span class="hlt">porous</span> sample, and on the resulting deformations of the matrix, opening new perspectives into the understanding of life in complex geometry. Figure 1. Left : cell culture growing in a model <span class="hlt">porous</span> medium. The white spheres represent the grains, bonds are displayed in grey, and microbes in green. Right: microscopy picture of glass beads linked by PDMS bridges, scale bar: 100 μm.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20140001874','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20140001874"><span id="translatedtitle">Regeneratively Cooled <span class="hlt">Porous</span> Media Jacket</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Mungas, Greg (Inventor); Fisher, David J. (Inventor); London, Adam Pollok (Inventor); Fryer, Jack Merrill (Inventor)</p> <p>2013-01-01</p> <p>The fluid and heat transfer theory for regenerative cooling of a rocket combustion chamber with a <span class="hlt">porous</span> media coolant jacket is presented. This model is used to design a regeneratively cooled rocket or other high temperature engine cooling jacket. Cooling jackets comprising impermeable inner and outer walls, and <span class="hlt">porous</span> media channels are disclosed. Also disclosed are <span class="hlt">porous</span> media coolant jackets with additional structures designed to transfer heat directly from the inner wall to the outer wall, and structures designed to direct movement of the coolant fluid from the inner wall to the outer wall. Methods of making such jackets are also disclosed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1998PhDT.......108P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1998PhDT.......108P"><span id="translatedtitle">Light emission from <span class="hlt">porous</span> silicon</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Penczek, John</p> <p></p> <p>The continuous evolution of silicon microelectronics has produced significant gains in electronic information processing. However, greater improvements in performance are expected by utilizing optoelectronic techniques. But these techniques have been severely limited in silicon- based optoelectronics due to the lack of an efficient silicon light emitter. The recent observation of efficient light emission from <span class="hlt">porous</span> silicon offer a promising opportunity to develop a suitable silicon light source that is compatible with silicon microelectronics. This dissertation examined the <span class="hlt">porous</span> silicon emission mechanism via photoluminescence, and by a novel device structure for <span class="hlt">porous</span> silicon emitters. The investigation first examined the correlation between <span class="hlt">porous</span> silicon formation conditions (and subsequent morphology) with the resulting photoluminescence properties. The quantum confinement theory for <span class="hlt">porous</span> silicon light emission contends that the morphology changes induced by the different formation conditions determine the optical properties of <span class="hlt">porous</span> silicon. The photoluminescence spectral shifts measured in this study, in conjunction with TEM analysis and published morphological data, lend support to this theory. However, the photoluminescence spectral broadening was attributed to electronic wavefunction coupling between adjacent silicon nanocrystals. An novel device structure was also investigated in an effort to improve current injection into the <span class="hlt">porous</span> silicon layer. The selective etching properties of <span class="hlt">porous</span> silicon were used to create a p-i-n structure with crystalline silicon contacts to the <span class="hlt">porous</span> silicon layer. The resulting device was found to have unique characteristics, with a negative differential resistance region and current-induced emission that spanned from 400 nm to 5500 nm. The negative differential resistance was correlated to resistive heating effects in the device. A numerical analysis of thermal emission spectra from silicon films, in addition to</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li class="active"><span>11</span></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_11 --> <div id="page_12" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li class="active"><span>12</span></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="221"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016EML....12...17J&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016EML....12...17J&link_type=ABSTRACT"><span id="translatedtitle">Fabrication and characterization of <span class="hlt">porous</span> silicon nanowires</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Jung, Daeyoon; Cho, Soo Gyeong; Moon, Taeho; Sohn, Honglae</p> <p>2016-01-01</p> <p>We report the synthesis of <span class="hlt">porous</span> silicon nanowires through the metalassisted chemical etching of <span class="hlt">porous</span> silicon in a solution of hydrofluoric acid and hydrogen peroxide. The morphology of <span class="hlt">porous</span> silicon nanowires was characterized by scanning electron microscopy and transmission electron microscopy. The etch rate of the <span class="hlt">porous</span> silicon nanowires was faster than that of silicon nanowires, but slower than that of <span class="hlt">porous</span> silicon. The <span class="hlt">porous</span> silicon nanowires distributed uniformly on the entire <span class="hlt">porous</span> silicon layer and the tips of the <span class="hlt">porous</span> silicon nanowires congregated together. The single crystalline and sponge-like <span class="hlt">porous</span> structure with the pore diameters of less than 5 nm was confirmed for the <span class="hlt">porous</span> silicon nanowires. [Figure not available: see fulltext.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22475958','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22475958"><span id="translatedtitle">Efficient visible-light photocatalytic performance of cuprous oxide <span class="hlt">porous</span> nanosheet arrays</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Li, Xianghua; Wang, Jianqiang; Cao, Minhua</p> <p>2015-10-15</p> <p>Graphical Abstract: We demonstrated a facile and efficient process for fabricating Cu{sub 2}O <span class="hlt">porous</span> nanosheet arrays on Cu mesh. Benefiting from the 1D array structure and <span class="hlt">porous</span> structure, the as-prepared Cu{sub 2}O sample exhibited significantly improved photocatalytic activity for methyl orange degradation under visible light irradiation. - Highlights: • Cu{sub 2}O <span class="hlt">porous</span> nanosheet arrays on Cu mesh were synthesized via the facile and efficient process. • The Cu{sub 2}O sample exhibited the 1D array structure and <span class="hlt">porous</span> nanosheet morphology. • The as-prepared Cu{sub 2}O <span class="hlt">porous</span> nanosheet arrays exhibited significantly improved photocatalytic activity. - Abstract: One-dimensional nanostructures are of great interest for a wide range of applications. In this work, we demonstrated the fabrication of visible-light-responsive Cu{sub 2}O <span class="hlt">porous</span> nanosheet arrays. The synthesis <span class="hlt">involved</span> the growth of Cu(OH){sub 2} nanosheet arrays on Cu mesh by solution-based corrosion and thermal transformation of Cu(OH){sub 2} nanosheet to Cu{sub 2}O <span class="hlt">porous</span> nanosheets on Cu mesh. Benefiting from the one dimensional array structure and <span class="hlt">porous</span> structure, the as-prepared Cu{sub 2}O <span class="hlt">porous</span> nanosheet arrays exhibited significantly improved photocatalytic activity for methyl orange degradation under visible light irradiation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/305763','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/305763"><span id="translatedtitle">Experimental investigation of contaminant transport in <span class="hlt">porous</span> media. Research report</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Wang, J.C.; Booker, J.R.; Carter, J.P.</p> <p>1998-10-01</p> <p>When numerical methods are applied to simulate a real contaminant transport problem, the values of a number of key parameters such as porosity, hydrodynamic dispersion coefficient or dispersivity and Darcy velocity or seepage velocity or seepage velocity are needed. In this paper, two different experimental programs, <span class="hlt">involving</span> two types of column test and a well simulation test, were designed to demonstrate that the theory developed to explain contaminant transport in <span class="hlt">porous</span> media is capable of representing the actual phenomenon of contaminant migration in soil. It is demonstrated that experiments can also be carried out to determine the properties necessary to model a real case of contaminant migration in <span class="hlt">porous</span> media.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21499737','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21499737"><span id="translatedtitle"><span class="hlt">Impact</span> of Cranial Irradiation Added to Intrathecal Conditioning in Hematopoietic Cell Transplantation in Adult Acute Myeloid Leukemia With Central Nervous System <span class="hlt">Involvement</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Mayadev, Jyoti S.; Douglas, James G.; Storer, Barry E.; Appelbaum, Frederick R.; Storb, Rainer</p> <p>2011-05-01</p> <p>Purpose: Neither the prognostic importance nor the appropriate management of central nervous system (CNS) <span class="hlt">involvement</span> is known for patients with acute myeloid leukemia (AML) undergoing hematopoietic cell transplantation (HCT). We examined the <span class="hlt">impact</span> of a CNS irradiation boost to standard intrathecal chemotherapy (ITC). Methods and Materials: From 1995 to 2005, a total of 648 adult AML patients received a myeloablative HCT: 577 patients were CNS negative (CNS-), and 71 were CNS positive (CNS+). Of the 71 CNS+ patients, 52 received intrathecal chemotherapy alone (CNS+ITC), and 19 received ITC plus an irradiation boost (CNS+RT). Results: The CNS-, CNS+ITC, and CNS+RT patients had 1- and 5-year relapse-free survivals (RFS) of 43% and 35%, 15% and 6%, and 37% and 32%, respectively. CNS+ITC patients had a statistically significant worse RFS compared with CNS- patients (hazard ratio [HR], 2.65; 95% confidence interval [CI], 2.0-3.6; p < 0.0001). CNS+RT patients had improved relapse free survival over that of CNS+ITC patients (HR, 0.45; 95% CI, 0.2-0.8; p = 0.01). The 1- and 5-year overall survivals (OS) of patients with CNS-, CNS+ITC, and CNS+RT, were 50% and 38%, 21% and 6%, and 53% and 42%, respectively. The survival of CNS+RT were significantly better than CNS+ITC patients (p = 0.004). After adjusting for known risk factors, CNS+RT patients had a trend toward lower relapse rates and reduced nonrelapse mortality. Conclusions: CNS+ AML is associated with a poor prognosis. The role of a cranial irradiation boost to intrathecal chemotherapy appears to mitigate the risk of CNS disease, and needs to be further investigated to define optimal treatment strategies.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26700405','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26700405"><span id="translatedtitle"><span class="hlt">Involvement</span> of NRN1 gene in schizophrenia-spectrum and bipolar disorders and its <span class="hlt">impact</span> on age at onset and cognitive functioning.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Fatjó-Vilas, Mar; Prats, Claudia; Pomarol-Clotet, Edith; Lázaro, Luisa; Moreno, Carmen; González-Ortega, Itxaso; Lera-Miguel, Sara; Miret, Salvador; Muñoz, Ma José; Ibáñez, Ignacio; Campanera, Sílvia; Giralt-López, Maria; Cuesta, Manuel J; Peralta, Victor; Ortet, Generós; Parellada, Mara; González-Pinto, Ana; McKenna, Peter J; Fañanás, Lourdes</p> <p>2016-03-01</p> <p>Objectives Neuritin 1 gene (NRN1) is <span class="hlt">involved</span> in neurodevelopment processes and synaptic plasticity and its expression is regulated by brain-derived neurotrophic factor (BDNF). We aimed to investigate the association of NRN1 with schizophrenia-spectrum disorders (SSD) and bipolar disorders (BPD), to explore its role in age at onset and cognitive functioning, and to test the epistasis between NRN1 and BDNF. Methods The study was developed in a sample of 954 SSD/BPD patients and 668 healthy subjects. Genotyping analyses included 11 SNPs in NRN1 and one functional SNP in BDNF. Results The frequency of the haplotype C-C (rs645649-rs582262) was significantly increased in patients compared to controls (P = 0.0043), while the haplotype T-C-C-T-C-A (rs3763180-rs10484320-rs4960155-rs9379002-rs9405890-rs1475157) was more frequent in controls (P = 3.1 × 10(-5)). The variability at NRN1 was nominally related to changes in age at onset and to differences in intelligence quotient, in SSD patients. Epistasis between NRN1 and BDNF was significantly associated with the risk for SSD/BPD (P = 0.005). Conclusions Results suggest that: (i) NRN1 variability is a shared risk factor for both SSD and BPD, (ii) NRN1 may have a selective <span class="hlt">impact</span> on age at onset and intelligence in SSD, and (iii) the role of NRN1 seems to be not independent of BDNF. PMID:26700405</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014PhDT.......309S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014PhDT.......309S"><span id="translatedtitle">Processing and Modeling of <span class="hlt">Porous</span> Copper Using Sintering Dissolution Process</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Salih, Mustafa Abualgasim Abdalhakam</p> <p></p> <p>The growth of <span class="hlt">porous</span> metal has produced materials with improved properties as compared to non-metals and solid metals. <span class="hlt">Porous</span> metal can be classified as either open cell or closed cell. Open cell allows a fluid media to pass through it. Closed cell is made up of adjacent sealed pores with shared cell walls. Metal foams offer higher strength to weight ratios, increased <span class="hlt">impact</span> energy absorption, and a greater tolerance to high temperatures and adverse environmental conditions when compared to bulk materials. Copper and its alloys are examples of these, well known for high strength and good mechanical, thermal and electrical properties. In the present study, the <span class="hlt">porous</span> Cu was made by a powder metallurgy process, using three different space holders, sodium chloride, sodium carbonate and potassium carbonate. Several different samples have been produced, using different ratios of volume fraction. The densities of the <span class="hlt">porous</span> metals have been measured and compared to the theoretical density calculated using an equation developed for these foams. The <span class="hlt">porous</span> structure was determined with the removal of spacer materials through sintering process. The sintering process of each spacer material depends on the melting point of the spacer material. Processing, characterization, and mechanical properties were completed. These tests include density measurements, compression tests, computed tomography (CT) and scanning electron microscopy (SEM). The captured morphological images are utilized to generate the object-oriented finite element (OOF) analysis for the <span class="hlt">porous</span> copper. <span class="hlt">Porous</span> copper was formed with porosities in the range of 40-66% with density ranges from 3 to 5.2 g/cm3. A study of two different methods to measure porosity was completed. OOF (Object Oriented Finite Elements) is a desktop software application for studying the relationship between the microstructure of a material and its overall mechanical, dielectric, or thermal properties using finite element models based on</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011AGUFM.H53L..08F&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011AGUFM.H53L..08F&link_type=ABSTRACT"><span id="translatedtitle">OPM: The Open <span class="hlt">Porous</span> Media Initiative</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Flemisch, B.; Flornes, K. M.; Lie, K.; Rasmussen, A.</p> <p>2011-12-01</p> <p>The principal objective of the Open <span class="hlt">Porous</span> Media (OPM) initiative is to develop a simulation suite that is capable of modeling industrially and scientifically relevant flow and transport processes in <span class="hlt">porous</span> media and bridge the gap between the different application areas of <span class="hlt">porous</span> media modeling, including reservoir mechanics, CO2 sequestration, biological systems, and product development of engineered media. The OPM initiative will provide a long-lasting, efficient, and well-maintained open-source software for flow and transport in <span class="hlt">porous</span> media built on modern software principles. The suite is released under the GNU General Public License (GPL). Our motivation is to provide a means to unite industry and public research on simulation of flow and transport in <span class="hlt">porous</span> media. For academic users, we seek to provide a software infrastructure that facilitates testing of new ideas on models with industry-standard complexity, while at the same time giving the researcher control over discretization and solvers. Similarly, we aim to accelerate the technology transfer from academic institutions to professional companies by making new research results available as free software of professional standard. The OPM initiative is currently supported by six research groups in Norway and Germany and funded by existing grants from public research agencies as well as from Statoil Petroleum and Total E&P Norge. However, a full-scale development of the OPM initiative requires substantially more funding and <span class="hlt">involvement</span> of more research groups and potential end users. In this talk, we will provide an overview of the current activities in the OPM initiative. Special emphasis will be given to the demonstration of the synergies achieved by combining the strengths of individual open-source software components. In particular, a new fully implicit solver developed within the DUNE-based simulator DuMux could be enhanced by the ability to read industry-standard Eclipse input files and to run on</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=Romance&pg=2&id=EJ1039711','ERIC'); return false;" href="http://eric.ed.gov/?q=Romance&pg=2&id=EJ1039711"><span id="translatedtitle">The <span class="hlt">Impact</span> of Direct <span class="hlt">Involvement</span> I and Direct <span class="hlt">Involvement</span> II Experiences on Secondary School Students' Social Capital, as Measured by Co-Cognitive Factors of the Operation Houndstooth Intervention Theory</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Sands, Michelle M.; Heilbronner, Nancy N.</p> <p>2014-01-01</p> <p>A mixed-methods study grounded in Renzulli's Operation Houndstooth Intervention Theory examined the <span class="hlt">impact</span> of different types of volunteer experiences on the six co-cognitive factors (Optimism, Courage, Romance With a Topic/Discipline, Sensitivity to Human Concerns, Physical/Mental Energy, and Vision/Sense of Destiny) associated with the…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1150645','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1150645"><span id="translatedtitle"><span class="hlt">Porous</span> substrates filled with nanomaterials</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Worsley, Marcus A.; Baumann, Theodore F.; Satcher, Jr., Joe H.; Stadermann, Michael</p> <p>2014-08-19</p> <p>A composition comprising: at least one <span class="hlt">porous</span> carbon monolith, such as a carbon aerogel, comprising internal pores, and at least one nanomaterial, such as carbon nanotubes, disposed uniformly throughout the internal pores. The nanomaterial can be disposed in the middle of the monolith. In addition, a method for making a monolithic solid with both high surface area and good bulk electrical conductivity is provided. A <span class="hlt">porous</span> substrate having a thickness of 100 microns or more and comprising macropores throughout its thickness is prepared. At least one catalyst is deposited inside the <span class="hlt">porous</span> substrate. Subsequently, chemical vapor deposition is used to uniformly deposit a nanomaterial in the macropores throughout the thickness of the <span class="hlt">porous</span> substrate. Applications include electrical energy storage, such as batteries and capacitors, and hydrogen storage.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007PhRvE..76b6311C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007PhRvE..76b6311C"><span id="translatedtitle">Hydraulic contacts controlling water flow across <span class="hlt">porous</span> grains</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Carminati, A.; Kaestner, A.; Flühler, H.; Lehmann, P.; Or, D.; Lehmann, E.; Stampanoni, M.</p> <p>2007-08-01</p> <p>Water flow between <span class="hlt">porous</span> grains varies widely depending on the water distribution in contacts between grains. The hydraulic behavior of contacts varies from highly conductive when water fills the contacts to a bottleneck to flow as water pressure drops and contact asperities rapidly drain. Such changes greatly <span class="hlt">impact</span> the hydraulic conductivity of <span class="hlt">porous</span> grain packs such as aggregated soil. The dominant driving force of water flow across contacts is capillarity, often quantified relative to gravity and viscous forces using the capillary and Bond numbers. For fast water infiltration, viscous forces dominate. For simplicity we modeled the water distribution between spherical <span class="hlt">porous</span> grains whose surfaces are covered by spherical bumps of much smaller radii. We provide experimental evidence obtained by neutron radiography and synchrotron-based x-ray tomographic microscopy documenting transitions in the flow behavior across contacts.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1040865','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1040865"><span id="translatedtitle"><span class="hlt">Porous</span> light-emitting compositions</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Burrell, Anthony K.; McCleskey, Thomas Mark; Jia, Quanxi; Bauer, Eve; Mueller, Alexander H.</p> <p>2012-04-17</p> <p>Light-emitting devices are prepared by coating a <span class="hlt">porous</span> substrate using a polymer-assisted deposition process. Solutions of metal precursor and soluble polymers having binding properties for metal precursor were coated onto <span class="hlt">porous</span> substrates. The coated substrates were heated at high temperatures under a suitable atmosphere. The result was a substrate with a conformal coating that did not substantially block the pores of the substrate.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005PSSCR...2.3424B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005PSSCR...2.3424B"><span id="translatedtitle">Gas sensors based on silicon devices with a <span class="hlt">porous</span> layer</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Barillaro, G.; Diligenti, A.; Nannini, A.; Strambini, L. M.</p> <p>2005-06-01</p> <p>In this work two silicon devices, that is a FET and a p crystalline silicon resistor having <span class="hlt">porous</span> silicon as adsorbing layer are presented as gas sensors. Owing to they are easily integrable with silicon electronics, these devices could represent an improvement of the functionality of silicon for sensor applications. Unlike other <span class="hlt">porous</span> silicon-based sensors, in this case the sensing variable is a current flowing in the crystalline silicon, so that the <span class="hlt">porous</span> silicon film has only the function of adsorbing layer and its properties, electrical or optical, are not directly <span class="hlt">involved</span> in the measurement. The fabrication processes and an electrical characterization in presence of isopropanol vapors are presented and discussed for both devices.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25500631','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25500631"><span id="translatedtitle">Additively manufactured <span class="hlt">porous</span> tantalum implants.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wauthle, Ruben; van der Stok, Johan; Amin Yavari, Saber; Van Humbeeck, Jan; Kruth, Jean-Pierre; Zadpoor, Amir Abbas; Weinans, Harrie; Mulier, Michiel; Schrooten, Jan</p> <p>2015-03-01</p> <p>The medical device industry's interest in open <span class="hlt">porous</span>, metallic biomaterials has increased in response to additive manufacturing techniques enabling the production of complex shapes that cannot be produced with conventional techniques. Tantalum is an important metal for medical devices because of its good biocompatibility. In this study selective laser melting technology was used for the first time to manufacture highly <span class="hlt">porous</span> pure tantalum implants with fully interconnected open pores. The architecture of the <span class="hlt">porous</span> structure in combination with the material properties of tantalum result in mechanical properties close to those of human bone and allow for bone ingrowth. The bone regeneration performance of the <span class="hlt">porous</span> tantalum was evaluated in vivo using an orthotopic load-bearing bone defect model in the rat femur. After 12 weeks, substantial bone ingrowth, good quality of the regenerated bone and a strong, functional implant-bone interface connection were observed. Compared to identical <span class="hlt">porous</span> Ti-6Al-4V structures, laser-melted tantalum shows excellent osteoconductive properties, has a higher normalized fatigue strength and allows for more plastic deformation due to its high ductility. It is therefore concluded that this is a first step towards a new generation of open <span class="hlt">porous</span> tantalum implants manufactured using selective laser melting. PMID:25500631</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2041842','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2041842"><span id="translatedtitle">NanoCipro Encapsulation in Monodisperse Large <span class="hlt">Porous</span> PLGA Microparticles</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Arnold, Matthew M.; Gorman, Eric M.; Schieber, Loren J.; Munson, Eric J.; Berland, Cory</p> <p>2007-01-01</p> <p>Pulmonary drug delivery of controlled release formulations may provide an effective adjunct approach to orally delivered antibiotics for clearing persistent lung infections. Dry powder formulations for this indication should possess characteristics including; effective deposition to infected lung compartments, persistence at the infection site, and steady release of antibiotic. Large <span class="hlt">porous</span> particles (∼10-15 μm) have demonstrated effective lung deposition and enhanced lung residence as a result of their large diameter and reduced clearance by macrophages in comparison to small microparticles (∼1-5 μm). In this report, Precision Particle Fabrication technology was used to create monodisperse large <span class="hlt">porous</span> particles of poly(D,L-lactic-co-glycolic acid) (PLGA) utilizing oils as extractable porogens. After extraction, the resulting large <span class="hlt">porous</span> PLGA particles exhibited a low density and a web-like or hollow interior depending on porogen concentration and type, respectively. Ciprofloxacin nanoparticles (nanoCipro) created by homogenization in dichloromethane, possessed a polymorph with a decreased melting temperature. Encapsulating nanoCipro in large <span class="hlt">porous</span> PLGA particles resulted in a steady release of ciprofloxacin that was extended for larger particle diameters and for the solid particle morphology in comparison to large <span class="hlt">porous</span> particles. The encapsulation efficiency of nanoCipro was quite low and factors <span class="hlt">impacting</span> the entrapment of nanoparticles during particle formation were elucidated. A dry powder formulation with the potential to control particle deposition and sustain release to the lung was developed and insight to improve nanoparticle encapsulation is discussed. PMID:17604870</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014PhDT........96T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014PhDT........96T"><span id="translatedtitle">Adhesion of liquids to <span class="hlt">porous</span> materials and fibers</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Trofimov, Artem</p> <p></p> <p>This research is centered on the analysis of adhesion properties of <span class="hlt">porous</span> materials and fibers of elliptical shapes. Composites are a unique class of materials having properties, which could not be achieved by either of the constituent materials alone. Composites with <span class="hlt">porous</span> filler are put into service in buildings, roads, bridges, etc. Fiber-reinforced composites are actively <span class="hlt">involved</span> in flight vehicles, automobiles, boats, and dozens of other products. In the first part of this study we developed a procedure for evaluation of adhesion of liquids to <span class="hlt">porous</span> solids, where water, hexadecane and asphalt binder and different rocks were studied to illustrate the methodology. An experimental protocol to evaluate the work of adhesion, a characteristic thermodynamic parameter of the liquid/<span class="hlt">porous</span> solid pair, was discussed and a mathematical model describing the kinetics of liquid penetration into inhomogeneous <span class="hlt">porous</span> material was developed and used for interpretation of the experiments. The second part is devoted to the analysis of interactions of liquids with circular and elliptical wires. The behavior of menisci embracing the fiber in the capillary rise experiment was investigated. In particular, we study the profiles of the contact line around cylinders, contact angle, and the work of adhesion of a set of different liquids. Compared to the circular wires, elliptical wires produced taller menisci, hence the wetted area increases. It is expected that the kinetics of resin impregnation into a preforms made of elliptical fibers will significantly change.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22136546','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22136546"><span id="translatedtitle">A <span class="hlt">POROUS</span>, LAYERED HELIOPAUSE</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Swisdak, M.; Drake, J. F.; Opher, M. E-mail: drake@umd.edu</p> <p>2013-09-01</p> <p>The picture of the heliopause (HP)-the boundary between the domains of the Sun and the local interstellar medium (LISM)-as a pristine interface with a large rotation in the magnetic field fails to describe recent Voyager 1 (V1) data. Magnetohydrodynamic (MHD) simulations of the global heliosphere reveal that the rotation angle of the magnetic field across the HP at V1 is small. Particle-in-cell simulations, based on cuts through the MHD model at V1's location, suggest that the sectored region of the heliosheath (HS) produces large-scale magnetic islands that reconnect with the interstellar magnetic field while mixing LISM and HS plasma. Cuts across the simulation reveal multiple, anti-correlated jumps in the number densities of LISM and HS particles, similar to those observed, at the magnetic separatrices. A model is presented, based on both the observations and simulations, of the HP as a <span class="hlt">porous</span>, multi-layered structure threaded by magnetic fields. This model further suggests that contrary to the conclusions of recent papers, V1 has already crossed the HP.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015P%26SS..107...64F','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015P%26SS..107...64F"><span id="translatedtitle">Hypervelocity cratering and disruption of <span class="hlt">porous</span> pumice targets: Implications for crater production, catastrophic disruption, and momentum transfer on <span class="hlt">porous</span> asteroids</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Flynn, George J.; Durda, Daniel D.; Patmore, Emma B.; Clayton, Angela N.; Jack, Sarah J.; Lipman, Miriam D.; Strait, Melissa M.</p> <p>2015-03-01</p> <p>Most asteroids for which porosities have been inferred have porosities from 20% to>50%. To investigate the effects of target porosity on cratering, <span class="hlt">impact</span> disruption, and momentum transfer we performed a series of 17 hypervelocity <span class="hlt">impact</span> experiments on high-porosity (60% to 85% <span class="hlt">porous</span>), terrestrial, pumice targets <span class="hlt">impacted</span> at speeds ranging from 3.5 to 5.2 km/s at the NASA Ames Vertical Gun Range. Eleven disruptions demonstrated that pumice targets are significantly stronger, i.e., they require more impactor kinetic energy per unit target mass to produce an equivalent disruption, than non-<span class="hlt">porous</span> targets. The threshold collisional specific energy, <mml:msubsup> Q D * , for this pumice is ~2380 J/kg, more than 60% greater than the value previously determined for ordinary chondrite meteorites having ~10% porosity, and more than three times the literature value for non-<span class="hlt">porous</span> terrestrial basalt. As a result, in the same impactor environment non-<span class="hlt">porous</span> asteroids, with properties similar to terrestrial basalt, and highly <span class="hlt">porous</span> asteroids with the properties of this pumice are equally likely to be disrupted, possibly explaining the survival of asteroids with moderate or high porosity. The six cratering events produced steep-walled, roughly cylindrical craters, with depth/diameter ratios of ~1 to ~2.7, rather than the bowl-shaped craters with depth/diameter ~0.5 produced in non-<span class="hlt">porous</span> targets. Computed microtomography shows little or no damage to the pumice outside the excavated crater volume even for impactor energies of approximately one-half <mml:msubsup> Q D * , an energy shown to produce global damage in non-<span class="hlt">porous</span> targets. Two large, overlapping craters were produced by successive hypervelocity <span class="hlt">impacts</span> into one pumice target, a result consistent with the interpretation of the large, overlapping craters on the asteroid 253 Mathilde being a result of its high (>50%) porosity. We measured the post-<span class="hlt">impact</span> momentum of a pumice target, showing that the recoil from the</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013PhDT........26D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013PhDT........26D"><span id="translatedtitle">Stability of Chromium Carbide/Chromium Oxide Based <span class="hlt">Porous</span> Ceramics in Supercritical Water</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Dong, Ziqiang</p> <p></p> <p>This research was aimed at developing <span class="hlt">porous</span> ceramics as well as ceramic-metal composites that can be potentially used in Gen-IV supercritical water reactors (SCWR). The research mainly includes two parts: 1) fabricating and engineering the <span class="hlt">porous</span> ceramics and <span class="hlt">porous</span> ceramic-metal composite; 2) Evaluating the stability of the <span class="hlt">porous</span> ceramics in SCW environments. Reactive sintering in carbonaceous environments was used to fabricate <span class="hlt">porous</span> Cr3C2/Cr2O3-based ceramic. A new process consisting of freeze casting and reactive sintering has also been successfully developed to fabricate highly <span class="hlt">porous</span> Cr3C 2 ceramics with multiple interconnected pores. Various amounts of cobalt powders were mixed with ceramic oxides in order to modify the <span class="hlt">porous</span> structure and property of the <span class="hlt">porous</span> carbide obtained by reactive sintering. The hardness of the M(Cr,Co)7C3-Co composite has been evaluated and rationalized based on the solid solution of cobalt in the ceramic phase, the composite effect of soft Co metal and the <span class="hlt">porous</span> structure of the ceramic materials. Efforts have also been made in fabricating and evaluating interpenetrating Cr3C2-Cu composites formed by infiltrating liquid copper into <span class="hlt">porous</span> Cr3C2. The corrosion evaluation mainly focused on assessing the stability of <span class="hlt">porous</span> Cr3C2 and Cr2O3 under various SCW conditions. The corrosion tests showed that the <span class="hlt">porous</span> Cr3C 2 is stable in SCW at temperatures below 425°C. However, cracking and disintegrating of the <span class="hlt">porous</span> Cr3C2 occurred when the SCW temperature increased above 425°C. Mechanisms of the corrosion attack were also investigated. The <span class="hlt">porous</span> Cr2O3 obtained by oxidizing the <span class="hlt">porous</span> Cr3C2 was exposed to various SCW environments. It was found that the stability of Cr 2O 3 was dependent on its morphology and the SCW testing conditions. Increasing SCW temperature increased the dissociation rate of the Cr2O 3. Adding proper amount of Y2O3 can increase the stability of the <span class="hlt">porous</span> Cr2O3 in SCW. It was also concluded that decreasing</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012PhDT........80W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012PhDT........80W"><span id="translatedtitle">Multiscale <span class="hlt">porous</span> fuel cell electrodes</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wen, Hao</p> <p></p> <p><span class="hlt">Porous</span> electrodes are widely used in fuel cells to enhance electrode performance due to their high surface area. Increasingly, such electrodes are designed with both micro-scale and nano-scale features. In the current work, carbon based <span class="hlt">porous</span> materials have been synthesized and utilized as bioelectrode support for biofuel cells, analysis of such <span class="hlt">porous</span> electrodes via rotating disk electrode has been enhanced by a numerical model that considers diffusion and convection within <span class="hlt">porous</span> media. Finally, <span class="hlt">porous</span> perovskite metal oxide cathodes for solid oxide fuel cell have been modeled to simulate impedance response data obtained from symmetric cells. Carbon fiber microelectrodes (CFME) were fabricated to mimic the microenvironment of carbon fiber paper based <span class="hlt">porous</span> electrodes. They were also miniature electrodes for small-scale applications. As observed by scanning electron microscopy (SEM), carbon nanotubes (CNTs) formed a homogeneously intertwined matrix. Biocatalysts can fully infiltrate this matrix to form a composite, with a significantly enhanced glucose oxidation current---that is 6.4 fold higher than the bare carbon fiber electrodes. Based on the CNT based <span class="hlt">porous</span> matrix, polystyrene beads of uniform diameter at 500 nm were used as template to tune the <span class="hlt">porous</span> structure and enhance biomolecule transport. Focused ion beam (FIB) was used to observe the morphology both at the surface and the cross-section. It has been shown that the template macro-pores enhanced the fuel transport and the current density has been doubled due to the improvement. Like commonly used rotating disk electrode, the <span class="hlt">porous</span> rotating disk electrode is a system with analytically solved flow field. Although models were proposed previously with first order kinetics and convection as the only mass transport at high rotations, some recent findings indicated that diffusion could play an important role at all disk rotation rates. In the current proposed model, enzymatic kinetics that follow a Ping</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3952028','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3952028"><span id="translatedtitle">Knowledge and prevention practices before breast cancer diagnosis in a cross-sectional study among survivors: <span class="hlt">impact</span> on patients' <span class="hlt">involvment</span> in the decision making process</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Taioli, Emanuela; Joseph, Gail R.; Robertson, Linda; Eckstein, Stacy; Ragin, Camille</p> <p>2013-01-01</p> <p>Disparities exist in breast cancer knowledge and education, which tend to influence symptom interpretation and decision to seek screening/care. The present project describes a cohort of women's experiences, knowledge and health behavior prior to and after a diagnosis of breast cancer. It also studies how knowledge and demographic factors are associated with level of <span class="hlt">involvement</span> participants had in the treatment of their breast cancer. Women > 18 years who have being diagnosed and treated for breast cancer within 10 years were recruited in Pittsburgh, PA, through the Healthy People Cohort Registry, a data base of volunteers from the community, and Brooklyn, NY through the American Cancer Society breast cancer survivor database. Subsequent to institutional ethics approvals, a questionnaire was administered by mail, and through an electronic interactive format. The study included 124 breast cancer survivors, one quarter of whom were of African ancestry. Roughly half of women indicated that their overall knowledge of breast cancer was limited before diagnosis; no significant association between overall knowledge before diagnosis and stage at diagnosis or an active role of the patient in treatment choices was observed. Two-third of women reported using personal research on internet, books and other media to increase knowledge on breast cancer after diagnosis; the improvement of knowledge was associated with an active role in therapy choice. White women's self report of breast cancer knowledge prior to diagnosis was higher than that of women of African origin (p=0.03); the latter experienced more delays in getting results about the diagnosis (p=0.002), in starting treatment (p=0.03), and in having treatment available at local facilities (p=0.007) than White women. White women were more likely to improve their knowledge through their own research (p=0.08) and through the contribution of their physician (p=0.06) than women of African origin. There is still a need for</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li class="active"><span>12</span></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_12 --> <div id="page_13" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li class="active"><span>13</span></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="241"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009PhDT........85K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009PhDT........85K"><span id="translatedtitle">In-situ growth of <span class="hlt">porous</span> alumino-silicates and fabrication of nano-<span class="hlt">porous</span> membranes</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kodumuri, Pradeep</p> <p>2009-12-01</p> <p>Feasibility of depositing continuous films of nano-<span class="hlt">porous</span> alumino-silicates, primarily zeolites and MCM-41, on metallic and non-metallic substrates was examined with an aim to develop membranes for separation of gaseous mixtures and also for application as hydrogen storage material. Mesoporous silica was deposited in-side the pores of these nano-<span class="hlt">porous</span> disks with an aim to develop membranes for selective separations. Our study <span class="hlt">involves</span> supported zeolite film growth on substrates using in-situ hydrothermal synthesis. Faujasite, Silicalite and Mesoporous silica have been grown on various metallic and non-metallic supports. Metallic substrates used for film growth included anodized titanium, sodium hydroxide treated Titanium, Anodized aluminum, and sintered copper. A non-metallic substrate used was nano-<span class="hlt">porous</span> aluminum oxide. Zeolite film growth was characterized using Scanning Electron Microscope (AMRAY 1820) and High Resolution Transmission electron microscope. Silicalite was found to grow uniformly on all the substrates to form a uniform and closely packed film. Faujasite tends to grow in the form of individual particles which do not inter-grow like silicalite to form a continuous film. Mesoporous silica was found to grow uniformly on anodized aluminum compared to growth on sintered copper and anodized titanium. Mesoporous silica growth on AnodiscRTM was found to cover more than half the surface of the substrate. Commercially obtained AnodiscRTM was found to have cylindrical channels of the pore branching into each other and since we needed pore channels of uniform dimension for Mesoporous silica growth, we have fabricated nano-<span class="hlt">porous</span> alumina with uniform pore channels. Nano-<span class="hlt">porous</span> alumina membranes containing uniform distribution of through thickness cylindrical pore channels were fabricated using anodization of aluminum disks. Free-standing nano-<span class="hlt">porous</span> alumina membranes were used as templates for electro-deposition in order to fabricate nickel and palladium nano</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=analysis+AND+service+AND+customer&pg=2&id=ED552368','ERIC'); return false;" href="http://eric.ed.gov/?q=analysis+AND+service+AND+customer&pg=2&id=ED552368"><span id="translatedtitle">Multi-Generational Perspectives: How They Interact and <span class="hlt">Impact</span> Service to Students and Their Families in an Age of Highly-<span class="hlt">Involved</span> Parents</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Wawrzusin, Andrea C.</p> <p>2013-01-01</p> <p>Although there have always been differences in how generations navigate decision-making in higher education, highly <span class="hlt">involved</span> parents have led to conflicting inter-generational educational expectations. This research study investigated the phenomenon of parental <span class="hlt">involvement</span> and how meanings on educational expectations vary depending on generation.…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/ED414533.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/ED414533.pdf"><span id="translatedtitle"><span class="hlt">Impact</span> of School-Related, Community-Based, and Parental-<span class="hlt">Involvement</span> Activities on Achievement of At-Risk Youth in the High School Setting.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Young, Barbara N.; Helton, Carol; Whitley, Marilyn E.</p> <p></p> <p>If teenagers do not find support at school, home, or in the community, then they will find it with peers, gangs, or other means. Subsequently, the importance of extra-curricular <span class="hlt">involvement</span> for at-risk youth is reported in this paper; to what extent this <span class="hlt">involvement</span> had potential to influence performance in academics is also examined. Involvement…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=sage+AND+journals&pg=4&id=EJ835531','ERIC'); return false;" href="http://eric.ed.gov/?q=sage+AND+journals&pg=4&id=EJ835531"><span id="translatedtitle">Parental <span class="hlt">Involvement</span> in Latina/Latino-<span class="hlt">Impacted</span> Schools in the Midwest: Recognizing the Role and Function of Home-Based Knowledge and Practices</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Lopez, Gerardo R.; Vazquez, Vanessa A.</p> <p>2006-01-01</p> <p>This qualitative research study aims to provide rich narratives of parental <span class="hlt">involvement</span> in households of newcomer Latino immigrants in the Midwest. A total of 20 families participated in this 4-month research study. Findings suggest that parents do get <span class="hlt">involved</span> in traditional ways but view "consejos" (the giving of sage advice) as a form of…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/ED545474.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/ED545474.pdf"><span id="translatedtitle">The <span class="hlt">Impact</span> of Family <span class="hlt">Involvement</span> on the Education of Children Ages 3 to 8: A Focus on Literacy and Math Achievement Outcomes and Social-Emotional Skills</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Van Voorhis, Frances L.; Maier, Michelle F.; Epstein, Joyce L.; Lloyd, Chrishana M.</p> <p>2013-01-01</p> <p>This report summarizes research conducted primarily over the past 10 years on how families' <span class="hlt">involvement</span> in children's learning and development through activities at home and at school affects the literacy, mathematics, and social-emotional skills of children ages 3 to 8. A total of 95 studies of family <span class="hlt">involvement</span> are reviewed. These…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/ED221973.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/ED221973.pdf"><span id="translatedtitle">Parent <span class="hlt">Involvement</span>.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>LaCrosse, Ed</p> <p></p> <p>The paper discusses the rationale and guidelines for parent <span class="hlt">involvement</span> in HCEEP (Handicapped Children's Early Education Program) projects. Ways of assessing parents' needs are reviewed, as are four types of services to meet the identified needs: parent education, direct participation, parent counseling, and parent provided programs. Materials and…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26975034','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26975034"><span id="translatedtitle">Absorption of impinging water droplet in <span class="hlt">porous</span> stones.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Lee, J B; Radu, A I; Vontobel, P; Derome, D; Carmeliet, J</p> <p>2016-06-01</p> <p>This paper presents an experimental investigation and numerical analysis of the absorption of water droplets <span class="hlt">impacting</span> <span class="hlt">porous</span> stones. The absorption process of an impinging droplet is here fully characterized from spreading to evaporation in terms of absorbed mass during droplet depletion and moisture content distribution in a time-resolved manner for three different natural stones. High-speed imaging and neutron radiography are used to quantify moisture absorption in <span class="hlt">porous</span> stones of varying moisture properties from deposition until depletion. During <span class="hlt">impact</span> and spreading, the droplet exhibits a dynamic non-wetting behavior. At maximum spreading, the droplet undergoes pinning, resulting into the contact radius remaining constant until droplet depletion. Absorption undergoes two phases: initially, absorption is hindered due a contact resistance attributed to entrapped air; afterwards, a more perfect capillary contact occurs and absorption goes on until depletion, concurrently with evaporation and further redistribution. A finite-element numerical model for isothermal unsaturated moisture transport in <span class="hlt">porous</span> media captures the phases of mass absorption in good agreement with the experimental data. Droplet spreading and absorption are highly determined by the <span class="hlt">impact</span> velocity of the droplet, while moisture content redistribution after depletion is much less dependent on <span class="hlt">impact</span> conditions. PMID:26975034</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/5417765','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/5417765"><span id="translatedtitle">Shock compaction of a <span class="hlt">porous</span> pyrotechnic material</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Lee, L. M.; Schwarz, A. C.</p> <p>1980-01-01</p> <p>The results of an experimental program to generate Hugoniot data for an unreacted pyrotechnic material are discussed and the data presented. The program included both sample fabrication and experimental determination of stress-particle velocity Hugoniot data for the pyrotechnic, titanium hydride-potassium perchlorate (TiH/sub 2/-KClO/sub 4/), at two densities. The TiH/sub 2/-KClO/sub 4/, which was supplied as a powder mixture, was pressed to the desired bulk sample density and size using a ram and die technique. Samples were produced with nominal 2.02 or 2.27 g/cm/sup 3/ densities. Hugoniot data were generated on the <span class="hlt">porous</span> pyrotechnic samples using standard flat plate <span class="hlt">impact</span> techniques. The experimental program provided information defining the shock compaction behavior of <span class="hlt">porous</span> TiH/sub 2/-KClO/sub 4/ up to 70 kbar. The Hugoniot data for both sample densities indicated full compaction was achieved in the 15 to 20 kbar stress range.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/5549485','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/5549485"><span id="translatedtitle">Steady flow through <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Greenkorn, R.A.</p> <p>1981-07-01</p> <p>The movement of materials through <span class="hlt">porous</span> media is of interest in many disciplines: in chemical engineering - adsorption, chromatography, filtration, flow in packed columns, ion exchange, reactor-engineering; in petroleum engineering - displacement of oil with gas, water and miscible solvents including surface-active agent solutions and description of reservoirs; in hydrology - movement of trace pollutants in water systems, recovery of water for drinking and irrigation, saltwater encroachment into freshwater reservoirs; in soil physics - movement of water, nutrients, and pollutants into plants; and in biophysics. This work reviews the fundamentals of steady flow through <span class="hlt">porous</span> media. It discusses the pseudotransport coefficients permeability, capillary pressure, and dispersion and relates these coefficients to the geometry of <span class="hlt">porous</span> media. It discusses single-fluid flow, multifluid immiscible flow, and multifluid miscible flow including the effects of heterogeneity, nonuniformity, and anisotropy of media. 104 references.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20110011143','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20110011143"><span id="translatedtitle">Acoustic Absorption in <span class="hlt">Porous</span> Materials</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Kuczmarski, Maria A.; Johnston, James C.</p> <p>2011-01-01</p> <p>An understanding of both the areas of materials science and acoustics is necessary to successfully develop materials for acoustic absorption applications. This paper presents the basic knowledge and approaches for determining the acoustic performance of <span class="hlt">porous</span> materials in a manner that will help materials researchers new to this area gain the understanding and skills necessary to make meaningful contributions to this field of study. Beginning with the basics and making as few assumptions as possible, this paper reviews relevant topics in the acoustic performance of <span class="hlt">porous</span> materials, which are often used to make acoustic bulk absorbers, moving from the physics of sound wave interactions with <span class="hlt">porous</span> materials to measurement techniques for flow resistivity, characteristic impedance, and wavenumber.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015SMaS...24h5035S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015SMaS...24h5035S"><span id="translatedtitle">Micromechanical analysis of <span class="hlt">porous</span> SMA</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sepe, V.; Auricchio, F.; Marfia, S.; Sacco, E.</p> <p>2015-08-01</p> <p>The present paper deals with computational micromechanical analyses of <span class="hlt">porous</span> shape memory alloy (SMA). <span class="hlt">Porous</span> SMAs are considered composite materials made of a dense SMA matrix including voids. A three-dimensional constitutive law is presented for the dense SMA able to reproduce the pseudo-elastic as well as the shape memory effects and, moreover, to account for the different elastic properties of the austenite and martensite phases. Furthermore, a numerical procedure is developed and the overall behavior of the <span class="hlt">porous</span> SMA is recovered studying a representative volume element. Comparisons between the numerical results, recovered using the proposed modeling, and experimental data available in the literature are presented. The case of closed and open porosity is investigated. Parametric studies have been conducted in order to investigate the influence of the porosity, the shape and orientation of the pores on the overall mechanical response and, mainly, on the energy absorption dissipation capability.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011PhDT........76M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011PhDT........76M"><span id="translatedtitle">Modeling isothermal and non-isothermal flows in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Mohseni Languri, Ehsan</p> <p>2011-12-01</p> <p>A complete understanding of the physics of flow and heat transfer phenomena in <span class="hlt">porous</span> media is vital for accurate simulation of flow processes in industrial applications. In one such application pertaining to liquid composite molding (LCM) for manufacturing polymer composites, the fiber preforms used in LCM as reinforcements are limited not only to the single-scale <span class="hlt">porous</span> media in the form of random fiber-mats, but also include dual-scale <span class="hlt">porous</span> media in the form of woven or stitched fiber-mats. The conventional flow physics is not able to model the resin filling process in LCM <span class="hlt">involving</span> the dual-scale <span class="hlt">porous</span> media. In this study, the flow in dual-scale <span class="hlt">porous</span> media is studied in order to predict the permeability of these fiber mats. The effect of aspect ratio of the fiber preform on the accuracy and flow during permeability estimation in single- and dual-scale <span class="hlt">porous</span> media is analyzed experimentally and numerically. Flow of liquid in a free channel bounded on one side by <span class="hlt">porous</span> medium is studied next, and two well-known boundary conditions of stress continuity and stress jump at the interface of the two regions are evaluated numerically. A point-wise solution for Stokes flow through periodic and non periodic <span class="hlt">porous</span> media (made of cylindrical particles) adjacent to the free channel is presented using the Imite element based CFD software COMSOL. The efficacy of the two interfacial conditions is evaluated after volume averaging the point-wise velocity using a long averaging volume, also called the representative elementary volume or REV, and then comparing such a volume-averaged velocity profile with the available analytical solution. The investigation is carried out for five different porosities at three different Reynolds numbers to cover a wide range of applications. The presence of randomly-placed cylinders during the creation of non-periodic <span class="hlt">porous</span> media damps out spatial fluctuations in the averaged velocity observed in periodic <span class="hlt">porous</span> media. The analytical</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/868499','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/868499"><span id="translatedtitle">Metal recovery from <span class="hlt">porous</span> materials</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Sturcken, Edward F.</p> <p>1992-01-01</p> <p>A method for recovering plutonium and other metals from materials by leaching comprising the steps of incinerating the materials to form a <span class="hlt">porous</span> matrix as the residue of incineration, immersing the matrix into acid in a microwave-transparent pressure vessel, sealing the pressure vessel, and applying microwaves so that the temperature and the pressure in the pressure vessel increase. The acid for recovering plutonium can be a mixture of HBF.sub.4 and HNO.sub.3 and preferably the pressure is increased to at least 100 PSI and the temperature to at least 200.degree. C. The <span class="hlt">porous</span> material can be pulverized before immersion to further increase the leach rate.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6344336','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6344336"><span id="translatedtitle"><span class="hlt">Porous</span> pseudoalloy electrode gap inserts</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Pustogarov, A.V.; Chernyshev, L.I.; Kostornov, A.G.; Mel'nikov, G.N.</p> <p>1985-06-01</p> <p>The authors make a comparative assessment of the service characteristics of <span class="hlt">porous</span> electrode gap inserts (EGI) made of tungsten, molybdenum, and W-Cu and Mo-Cu pseudoalloys, tested using a high pressure apparatus. Charts present the data gathered on maximum thermal flux entering the EGI wall with specific nitrogen flow rates; variation of temperature of the inner surface of the EGI wall with thermal conductivity of the material; and variation of viscous and inertia coefficients of hydraulic resistance of pseudoalloys with duration of EGI operation. The authors conclude that <span class="hlt">porous</span> EGIs made of W-Cu and Mo-Cu pseudoalloys are characterized by the same operating performance.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016ResPh...6..337L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016ResPh...6..337L"><span id="translatedtitle">Study of the deposition process of vinpocetine on the surface of <span class="hlt">porous</span> silicon</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lenshin, A. S.; Polkovnikova, Yu. A.; Seredin, P. V.</p> <p></p> <p>Currently the most prospective way in pharmacotherapy is the obtaining of nanoparticles <span class="hlt">involving</span> pharmaceutical substances. Application of <span class="hlt">porous</span> inorganic materials on the basis of silicon is among the main features in solving of this problem. The present work is concerned with the problem of the deposition of pharmaceutical drug with nootropic activity - vinpocetine - into <span class="hlt">porous</span> silicon. Silicon nanoparticles were obtained by electrochemical anodic etching of Si plates. The process of vinpocetine deposition was studied in dependence of the deposition time. As a result of the investigations it was found that infrared transmission spectra of <span class="hlt">porous</span> silicon with the deposited vinpocetine revealed the absorption bands characteristic of vinpocetine substance.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1014938','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1014938"><span id="translatedtitle">Enhancement of thermal stability of <span class="hlt">porous</span> bodies comprised of stainless steel or an alloy</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Bischoff, Brian L.; Sutton, Theodore G.; Judkins, Roddie R.; Armstrong, Timothy R.; Adcock, Kenneth D.</p> <p>2010-11-09</p> <p>A method for treating a <span class="hlt">porous</span> item constructed of metal powder, such as a powder made of Series 400 stainless steel, <span class="hlt">involves</span> a step of preheating the <span class="hlt">porous</span> item to a temperature of between about 700 and 900.degree. C. degrees in an oxidizing atmosphere and then sintering the body in an inert or reducing atmosphere at a temperature which is slightly below the melting temperature of the metal which comprises the <span class="hlt">porous</span> item. The thermal stability of the resulting item is enhanced by this method so that the item retains its porosity and metallic characteristics, such as ductility, at higher (e.g. near-melting) temperatures.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3989372','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3989372"><span id="translatedtitle">Environmental concentrations of the selective serotonin reuptake inhibitor fluoxetine <span class="hlt">impact</span> specific behaviors <span class="hlt">involved</span> in reproduction, feeding and predator avoidance in the fish Pimephales promelas (fathead minnow)</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Weinberger, Joel; Klaper, Rebecca</p> <p>2014-01-01</p> <p>Pharmaceuticals and personal care products (PPCP) have been found in surface waters worldwide, but little is understood of their effects on the wildlife that inhabit these waters. Fluoxetine (Prozac; Eli Lilly), a highly prescribed selective serotonin reuptake inhibitor (SSRI), is a commonly found PPCP in surface water. The purpose of this project was to determine if environmentally relevant concentrations of fluoxetine <span class="hlt">impact</span> behavior that is important for population survival in native fish species, including reproduction, feeding and predator avoidance. Chronic 4-week exposures were conducted with doses ranging from 100 ng/L to 100 μg/L to cover a range of environmentally relevant concentrations up to higher concentrations comparable to other published studies with the same drug that have documented various physiological <span class="hlt">impacts</span>. Pimephales promelas (fathead minnow), a species native to North America, was used as it conducts a range of specific mating behaviors and therefore serves as an excellent model of specific <span class="hlt">impacts</span> on brain function. Fluoxetine concentrations as low as 1 μg/L, a concentration that has been found in many freshwater environments, were found to significantly <span class="hlt">impact</span> mating behavior, specifically nest building and defending in male fish. Males were also found to display aggression, isolation, and repetitive behaviors at higher concentrations. Female mating behavior was largely unaffected. In addition, predator avoidance behaviors in males and females were also <span class="hlt">impacted</span> at 1 μg/L. Feeding was <span class="hlt">impacted</span> at 10 μg/L and in the highest exposure (100 μg/L), egg production was limited by deaths of females due to significant male aggressive behaviors in first two weeks of exposure. Specific behavioral changes occurred at each concentration (most noticeably 1 μg/L and 100 μg/L) indicating a dose dependent effect that triggered different responses at lower exposures versus higher exposures or differential <span class="hlt">impacts</span> of dose depending on brain region</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/441854','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/biblio/441854"><span id="translatedtitle">Process of preparing tritiated <span class="hlt">porous</span> silicon</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Tam, S.W.</p> <p>1997-02-18</p> <p>A process of preparing tritiated <span class="hlt">porous</span> silicon is described in which <span class="hlt">porous</span> silicon is equilibrated with a gaseous vapor containing HT/T{sub 2} gas in a diluent for a time sufficient for tritium in the gas phase to replace hydrogen present in the pore surfaces of the <span class="hlt">porous</span> silicon. 1 fig.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/361809','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/361809"><span id="translatedtitle">Strain rate effects in <span class="hlt">porous</span> materials</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Lankford, J. Jr.; Dannemann, K.A.</p> <p>1998-12-31</p> <p>The behavior of metal foams under rapid loading conditions is assessed. Dynamic loading experiments were conducted in their laboratory using a split Hopkinson pressure bar apparatus and a drop weight tester; Strain rates ranged from 45 s{sup {minus}1} to 1200 s{sup {minus}1}. The implications of these experiments on open-cell, <span class="hlt">porous</span> metals, and closed- and open-cell polymer foams are described. It is shown that there are two possible strain-rate dependent contributors to the <span class="hlt">impact</span> resistance of cellular metals: (i) elastic-plastic resistance of the cellular metal skeleton, and (ii) the gas pressure generated by gas flow within distorted open cells. A theoretical basis for these implications is presented.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/23650917','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/23650917"><span id="translatedtitle">Undermining patient and public engagement and limiting its <span class="hlt">impact</span>: the consequences of the Health and Social Care Act 2012 on collective patient and public <span class="hlt">involvement</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Tritter, Jonathan Q; Koivusalo, Meri</p> <p>2013-06-01</p> <p>Patient and public <span class="hlt">involvement</span> has been at the heart of UK health policy for more than two decades. This commitment to putting patients at the heart of the British National Health Service (NHS) has become a central principle helping to ensure equity, patient safety and effectiveness in the health system. The recent Health and Social Care Act 2012 is the most significant reform of the NHS since its foundation in 1948. More radically, this legislation undermines the principle of patient and public <span class="hlt">involvement</span>, public accountability and returns the power for prioritisation of health services to an unaccountable medical elite. This legislation marks a sea-change in the approach to patient and public <span class="hlt">involvement</span> in the UK and signals a shift in the commitment of the UK government to patient-centred care. PMID:23650917</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li class="active"><span>13</span></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_13 --> <div id="page_14" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li class="active"><span>14</span></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="261"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/23942767','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/23942767"><span id="translatedtitle"><span class="hlt">Impact</span> of cardiac <span class="hlt">involvement</span> on the risk of mortality among patients with systemic sclerosis: a 5-year follow-up of a single-center cohort.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Költő, Gyöngyvér; Faludi, Réka; Aradi, Dániel; Bartos, Barbara; Kumánovics, Gábor; Minier, Tünde; Czirják, László; Komócsi, András</p> <p>2014-02-01</p> <p>Cardiac <span class="hlt">involvement</span> is among the leading causes of mortality in patients with systemic sclerosis (SSc). Previously, we demonstrated in a single-center, cross-sectional study the frequent coexistence of different forms of cardiac <span class="hlt">involvement</span> in systemic sclerosis including pulmonary arterial hypertension (PAH), coronary artery disease (CAD), and microvascular dysfunction (MVD). The aim of the present study was to investigate the prognostic significance of cardiac <span class="hlt">involvement</span>. One hundred twenty patients with SSc were enrolled. All cases underwent a non-invasive cardiovascular protocol. In 30 patients with suspected cardiac <span class="hlt">involvement</span>, right heart catheterization and intra-coronary pressure-wire-supplemented coronary angiography were performed. Clinical follow-up was 5 years. Patients with CAD at the baseline showed a trend for higher cardiovascular mortality while in patients with MVD this difference was significant (26.7 % versus 9.5 %, p = 0.077 and 30 % versus 10.1 %, p < 0.05, respectively). Cardiovascular mortality of PAH cases was higher but, however, did not reach statistical significance 21.4 % versus 10.4 %, p = 0.261. Cardiovascular event-free survival was significantly lower among patients with combinations of two or three disorders (p < 0.05). Multivariate analysis of organ <span class="hlt">involvements</span> and comorbidities showed that the diffuse cutaneous subset, the presence of kidney <span class="hlt">involvement</span>, the velocity of the tricuspid regurgitation, as well as diabetes mellitus were independent predictors of overall mortality. MVD and CAD alone or in combination with PAH significantly affected the 5-year cardiovascular mortality. These findings highlight the prognostic importance of coronary disease in patients with SSc [ www.clinicaltrials.gov (Reg. Nr.: NCT00843102)]. PMID:23942767</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015PhDT.......340S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015PhDT.......340S"><span id="translatedtitle">Engineered Surface Properties of <span class="hlt">Porous</span> Tungsten from Cryogenic Machining</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Schoop, Julius Malte</p> <p></p> <p><span class="hlt">Porous</span> tungsten is used to manufacture dispenser cathodes due to it refractory properties. Surface porosity is critical to functional performance of dispenser cathodes because it allows for an impregnated ceramic compound to migrate to the emitting surface, lowering its work function. Likewise, surface roughness is important because it is necessary to ensure uniform wetting of the molten impregnate during high temperature service. Current industry practice to achieve surface roughness and surface porosity requirements <span class="hlt">involves</span> the use of a plastic infiltrant during machining. After machining, the infiltrant is baked and the cathode pellet is impregnated. In this context, cryogenic machining is investigated as a substitutionary process for the current plastic infiltration process. Along with significant reductions in cycle time and resource use, surface quality of cryogenically machined un-infiltrated (as-sintered) <span class="hlt">porous</span> tungsten has been shown to significantly outperform dry machining. The present study is focused on examining the relationship between machining parameters and cooling condition on the as-machined surface integrity of <span class="hlt">porous</span> tungsten. The effects of cryogenic pre-cooling, rake angle, cutting speed, depth of cut and feed are all taken into consideration with respect to machining-induced surface morphology. Cermet and Polycrystalline diamond (PCD) cutting tools are used to develop high performance cryogenic machining of <span class="hlt">porous</span> tungsten. Dry and pre-heated machining were investigated as a means to allow for ductile mode machining, yet severe tool-wear and undesirable smearing limited the feasibility of these approaches. By using modified PCD cutting tools, high speed machining of <span class="hlt">porous</span> tungsten at cutting speeds up to 400 m/min is achieved for the first time. Beyond a critical speed, brittle fracture and built-up edge are eliminated as the result of a brittle to ductile transition. A model of critical chip thickness ( hc ) effects based on cutting</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=138849&keyword=participation+AND+citizen&actType=&TIMSType=+&TIMSSubTypeID=&DEID=&epaNumber=&ntisID=&archiveStatus=Both&ombCat=Any&dateBeginCreated=&dateEndCreated=&dateBeginPublishedPresented=&dateEndPublishedPresented=&dateBeginUpdated=&dateEndUpdated=&dateBeginCompleted=&dateEndCompleted=&personID=&role=Any&journalID=&publisherID=&sortBy=revisionDate&count=50&CFID=76786079&CFTOKEN=16038296','EPA-EIMS'); return false;" href="http://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=138849&keyword=participation+AND+citizen&actType=&TIMSType=+&TIMSSubTypeID=&DEID=&epaNumber=&ntisID=&archiveStatus=Both&ombCat=Any&dateBeginCreated=&dateEndCreated=&dateBeginPublishedPresented=&dateEndPublishedPresented=&dateBeginUpdated=&dateEndUpdated=&dateBeginCompleted=&dateEndCompleted=&personID=&role=Any&journalID=&publisherID=&sortBy=revisionDate&count=50&CFID=76786079&CFTOKEN=16038296"><span id="translatedtitle">THE <span class="hlt">IMPACT</span> OF STATE LEVEL BROWNFIELDS PROGRAM PUBLIC PARTICIPATION MECHANISMS ON DISADVANTAGED COMMUNITY <span class="hlt">INVOLVEMENT</span> IN DECISION-MAKING: A CASE COMPARISON</span></a></p> <p><a target="_blank" href="http://oaspub.epa.gov/eims/query.page">EPA Science Inventory</a></p> <p></p> <p></p> <p>A recent EPA survey of state-level brownfields programs shows great variability among states in use of public participation tools such as public record and notice, public comment, hearing, meeting and citizen group grants. This study seeks to evaluate the <span class="hlt">impact</span> of these tools o...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013EGUGA..1511914L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013EGUGA..1511914L"><span id="translatedtitle">Instability of fluid flow over saturated <span class="hlt">porous</span> medium</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lyubimova, Tatyana; Kolchanova, Ekaterina; Lyubimov, Dmitry</p> <p>2013-04-01</p> <p>We investigate the stability of a fluid flow over a saturated <span class="hlt">porous</span> medium. The problem is of importance due to the applications to washing out of contaminants from the bottom layer of vegetation, whose properties are similar to the properties of <span class="hlt">porous</span> medium. In the case of <span class="hlt">porous</span> medium with the relatively high permeability and porosity the flow <span class="hlt">involves</span> a part of the fluid saturating the <span class="hlt">porous</span> medium, with the tangential fluid velocity drop occurring because of the resistance of the solid matrix. The drop leads to the instability analogous to Kelvin-Helmholtz one accompanied by the formation of travelling waves. In the present paper we consider a two-layer system consisting of a pure fluid layer and a <span class="hlt">porous</span> layer saturated by the fluid located underneath. The system is bounded by a rigid surface at the bottom and a non-deformable free surface at the top. It is under the gravity and inclined at a slight angle to the horizontal axis. The boundary conditions at the interface between the fluid and <span class="hlt">porous</span> layers are the continuity of fluid velocities and the balance of normal and tangential stresses taking into account the resistance of the solid matrix with respect to the fluid flow near the interface [1-2]. The problem is solved in the framework of the Brinkman model applying the classical shooting algorithm with orthogonalization. The stability boundaries of the stationary fluid flow over the saturated <span class="hlt">porous</span> medium with respect to the small oscillatory perturbations are obtained for the various values of the Darcy number and the ratio of the <span class="hlt">porous</span> layer thickness to the full thickness of the system d. It was shown that at the d > 0.5 with increasing the <span class="hlt">porous</span> layer thickness (or with decreasing of the fluid layer thickness) the stability threshold rises. This is because of the fact that the instability is primarily caused by perturbations located in the fluid layer. At the d < 0.5 the reduction of the <span class="hlt">porous</span> layer thickness leads to the stability threshold</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19680000438','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19680000438"><span id="translatedtitle">Hydrostatic testing of <span class="hlt">porous</span> assemblies</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Bigelow, W. L.</p> <p>1968-01-01</p> <p>Pores of the material were plugged with dust particles suspended in water. The plugging material used was a standard test dust prepared as a slurry in distilled water. This technique provides a permanent high-integrity seal for <span class="hlt">porous</span> material without affecting its physical properties, yet permitting pressure testing to verify structural adequacy.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2006Nanot..17..901Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2006Nanot..17..901Z"><span id="translatedtitle">Fabrication of <span class="hlt">porous</span> electrospun nanofibres</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhang, Y. Z.; Feng, Y.; Huang, Z.-M.; Ramakrishna, S.; Lim, C. T.</p> <p>2006-02-01</p> <p>Immiscible biopolymers of gelatin (Gt) and polycaprolactone (PCL) were first electrospun into a biomimicking composite fibre of Gt/PCL. Based on a phase separation study of the electrospun fibres, a leaching method was employed to generate 3D <span class="hlt">porous</span> nanofibres by selectively removing the water soluble component of gelatin in a 37 °C aqueous solution of phosphate buffered saline. It was found that leaching treatment gave rise to a unique nanotopography containing grooves, ridges and elliptical pores on the surface as well as inside of the resultant individual nanofibres. Brunauer-Emmett-Teller (BET) area measurement indicated that the formed 3D <span class="hlt">porous</span> fibres also brought in a pronounced increase of the surface area of fibres. The BET surface area of the <span class="hlt">porous</span> fibres was observed to be about 2.4 times that of the precursor fibres, up to 15.84 m2 g-1 at its relatively large size of 800 nm diameter. The 3D <span class="hlt">porous</span> fibres herein prepared could have considerable value for uses in developing highly integrated cell-scaffold tissue complexes and other industrial applications.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21254921','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21254921"><span id="translatedtitle">Neural Tissue as <span class="hlt">Porous</span> Media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Basser, Peter J.</p> <p>2008-12-05</p> <p>The fields of MR in <span class="hlt">Porous</span> Media and Neuroradiology have largely developed separately during the past two decades with little appreciation of the problems, challenges and methodologies of the other. However, this trend is clearly changing and possibilities for significant cross-fertilization and synergies are now being realized.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/10162698','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10162698"><span id="translatedtitle">Metal recovery from <span class="hlt">porous</span> materials</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Sturcken, E.F.</p> <p>1991-01-01</p> <p>The present invention relates to recovery of metals. More specifically, the present invention relates to the recovery of plutonium and other metals from <span class="hlt">porous</span> materials using microwaves. The United States Government has rights in this invention pursuant to Contract No. DE-AC09-89SR18035 between the US Department of Energy and Westinghouse Savannah River Company.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/228041','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/228041"><span id="translatedtitle">Whey drying on <span class="hlt">porous</span> carriers</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Mitura, E.; Kaminski, W.</p> <p>1996-05-01</p> <p>Whey is treated very often as a waste which pollutes the natural environment. Whey which is a valuable source of protein, lacrose, vitamins and mineral salts should be utilized completely. The present paper is a proposal of whey drying on <span class="hlt">porous</span> carriers. It is proved experimentally that the proposed drying method guarantees good product quality.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012AGUFM.H43E1407R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012AGUFM.H43E1407R"><span id="translatedtitle">Linking Colloid Deposit Morphology and Clogging in <span class="hlt">Porous</span> Media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Roth, E. J.; Mont-eton, M. E.; Mays, D. C.</p> <p>2012-12-01</p> <p> analyzed to provide measurement of deposit fractal dimension—a novel technique that is unique to our research. Experimental results indicate that deposit fractal dimension can be quantified. Continuing research is investigating the extent to which colloid concentration, ionic strength, flow velocity, and other environmental factors will <span class="hlt">impact</span> colloid deposit morphology in <span class="hlt">porous</span> media and the resulting <span class="hlt">impact</span> on clogging. The ultimate goal of this research is to create a clogging model that links colloidal and environmental characteristics to permeability in soils.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=family+AND+relationship+AND+substance&id=EJ805599','ERIC'); return false;" href="http://eric.ed.gov/?q=family+AND+relationship+AND+substance&id=EJ805599"><span id="translatedtitle">The <span class="hlt">Impact</span> of Gender and Family Processes on Mental Health and Substance Use Issues in a Sample of Court-<span class="hlt">Involved</span> Female and Male Adolescents</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Gavazzi, Stephen M.; Lim, Ji-Young; Yarcheck, Courtney M.; Bostic, Jennifer M.; Scheer, Scott D.</p> <p>2008-01-01</p> <p>Greater empirical attention directed toward gender-sensitive assessment strategies that concentrate on family-specific factors is thought to be both timely and necessary, especially with regard to outcome variables associated with mental health and substance abuse in at-risk adolescent populations. A sample of 2,646 court-<span class="hlt">involved</span> adolescents was…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/ED531947.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/ED531947.pdf"><span id="translatedtitle">Teenagers' Significant Experiences in Areas of Arts: A Study of the Subjectively Felt <span class="hlt">Impact</span> and Some Qualitative Aspects of Experiences <span class="hlt">Involving</span> Productive Arts Activities</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Finnas, Leif</p> <p>2012-01-01</p> <p>As a part of a larger project, this study focused primarily on Finland-Swedish ninth-graders' "productive" arts experiences (<span class="hlt">involving</span> music-making, acting, writing, painting/drawing, dancing), as these had been reported when the pupils had been asked to write down descriptions of "strong" experiences in arts areas (music, dramatic art, literature…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JSV...334..190L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JSV...334..190L"><span id="translatedtitle">Tandem cylinder aerodynamic sound control using <span class="hlt">porous</span> coating</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Liu, Hanru; Azarpeyvand, Mahdi; Wei, Jinjia; Qu, Zhiguo</p> <p>2015-01-01</p> <p>This study is concerned with the application of <span class="hlt">porous</span> coatings as a passive flow control method for reducing the aerodynamic sound from tandem cylinders. The aim here is to perform a parametric proof-of-concept study to investigate the effectiveness of <span class="hlt">porous</span> treatment on bare tandem cylinders to control and regularize the vortex shedding and flow within the gap region between the two bluff bodies, and thereby control the aerodynamic sound generation mechanism. The aerodynamic simulations are performed using 2D transient RANS approach with k - ω turbulence model, and the acoustic computations are carried out using the standard Ffowcs Williams-Hawkings (FW-H) acoustic analogy. Numerical flow and acoustic results are presented for bare tandem cylinders and <span class="hlt">porous</span>-covered cylinders, with different porosities and thicknesses. Experimental flow and acoustic data are also provided for comparison. Results show that the proper use of <span class="hlt">porous</span> coatings can lead to stabilization of the vortex shedding within the gap region, reduction of the vortex shedding interaction with the downstream body, and therefore the generation of tonal and broadband noise. It has also been observed that the magnitude and the frequency of the primary tone reduce significantly as a result of the flow regularization. The proposed passive flow-induced noise and vibration control method can potentially be used for other problems <span class="hlt">involving</span> flow interaction with bluff bodies.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20080006974','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20080006974"><span id="translatedtitle"><span class="hlt">Porous</span> silicon carbide (SIC) semiconductor device</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Shor, Joseph S. (Inventor); Kurtz, Anthony D. (Inventor)</p> <p>1996-01-01</p> <p><span class="hlt">Porous</span> silicon carbide is fabricated according to techniques which result in a significant portion of nanocrystallites within the material in a sub 10 nanometer regime. There is described techniques for passivating <span class="hlt">porous</span> silicon carbide which result in the fabrication of optoelectronic devices which exhibit brighter blue luminescence and exhibit improved qualities. Based on certain of the techniques described <span class="hlt">porous</span> silicon carbide is used as a sacrificial layer for the patterning of silicon carbide. <span class="hlt">Porous</span> silicon carbide is then removed from the bulk substrate by oxidation and other methods. The techniques described employ a two-step process which is used to pattern bulk silicon carbide where selected areas of the wafer are then made <span class="hlt">porous</span> and then the <span class="hlt">porous</span> layer is subsequently removed. The process to form <span class="hlt">porous</span> silicon carbide exhibits dopant selectivity and a two-step etching procedure is implemented for silicon carbide multilayers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2013PhFl...25g6102A&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2013PhFl...25g6102A&link_type=ABSTRACT"><span id="translatedtitle">Attenuation of shock waves propagating through nano-structured <span class="hlt">porous</span> materials</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Al-Qananwah, Ahmad K.; Koplik, Joel; Andreopoulos, Yiannis</p> <p>2013-07-01</p> <p><span class="hlt">Porous</span> materials have long been known to be effective in energy absorption and shock wave attenuation. These properties make them attractive in blast mitigation strategies. Nano-structured materials have an even greater potential for blast mitigation because of their high surface-to-volume ratio, a geometric parameter which substantially attenuates shock wave propagation. A molecular dynamics approach was used to explore the effects of this remarkable property on the behavior of traveling shocks <span class="hlt">impacting</span> on solid materials. The computational setup included a moving piston, a gas region and a target solid wall with and without a <span class="hlt">porous</span> structure. The gas and <span class="hlt">porous</span> solid were modeled by Lennard-Jones-like and effective atom potentials, respectively. The shock wave is resolved in space and time and its reflection from a solid wall is gradual, due to the wave's finite thickness, and entails a self-interaction as the reflected wave travels through the incoming incident wave. Cases investigated include a free standing <span class="hlt">porous</span> structure, a <span class="hlt">porous</span> structure attached to a wall and <span class="hlt">porous</span> structures with graded porosity. The effects of pore shape and orientation have been also documented. The results indicate that placing a nano-<span class="hlt">porous</span> material layer in front of the target wall reduced the stress magnitude and the energy deposited inside the solid by about 30 percent, while at the same time substantially decreasing the loading rate.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26657931','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26657931"><span id="translatedtitle">Hydromagnetic Flow and Heat Transfer over a <span class="hlt">Porous</span> Oscillating Stretching Surface in a Viscoelastic Fluid with <span class="hlt">Porous</span> Medium.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Khan, Sami Ullah; Ali, Nasir; Abbas, Zaheer</p> <p>2015-01-01</p> <p>An analysis is carried out to study the heat transfer in unsteady two-dimensional boundary layer flow of a magnetohydrodynamics (MHD) second grade fluid over a <span class="hlt">porous</span> oscillating stretching surface embedded in <span class="hlt">porous</span> medium. The flow is induced due to infinite elastic sheet which is stretched periodically. With the help of dimensionless variables, the governing flow equations are reduced to a system of non-linear partial differential equations. This system has been solved numerically using the finite difference scheme, in which a coordinate transformation is used to transform the semi-infinite physical space to a bounded computational domain. The influence of the <span class="hlt">involved</span> parameters on the flow, the temperature distribution, the skin-friction coefficient and the local Nusselt number is shown and discussed in detail. The study reveals that an oscillatory sheet embedded in a fluid-saturated <span class="hlt">porous</span> medium generates oscillatory motion in the fluid. The amplitude and phase of oscillations depends on the rheology of the fluid as well as on the other parameters coming through imposed boundary conditions, inclusion of body force term and permeability of the <span class="hlt">porous</span> medium. It is found that amplitude of flow velocity increases with increasing viscoelastic and mass suction/injection parameters. However, it decreases with increasing the strength of the applied magnetic field. Moreover, the temperature of fluid is a decreasing function of viscoelastic parameter, mass suction/injection parameter and Prandtl number. PMID:26657931</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4682809','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4682809"><span id="translatedtitle">Hydromagnetic Flow and Heat Transfer over a <span class="hlt">Porous</span> Oscillating Stretching Surface in a Viscoelastic Fluid with <span class="hlt">Porous</span> Medium</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Khan, Sami Ullah; Ali, Nasir; Abbas, Zaheer</p> <p>2015-01-01</p> <p>An analysis is carried out to study the heat transfer in unsteady two-dimensional boundary layer flow of a magnetohydrodynamics (MHD) second grade fluid over a <span class="hlt">porous</span> oscillating stretching surface embedded in <span class="hlt">porous</span> medium. The flow is induced due to infinite elastic sheet which is stretched periodically. With the help of dimensionless variables, the governing flow equations are reduced to a system of non-linear partial differential equations. This system has been solved numerically using the finite difference scheme, in which a coordinate transformation is used to transform the semi-infinite physical space to a bounded computational domain. The influence of the <span class="hlt">involved</span> parameters on the flow, the temperature distribution, the skin-friction coefficient and the local Nusselt number is shown and discussed in detail. The study reveals that an oscillatory sheet embedded in a fluid-saturated <span class="hlt">porous</span> medium generates oscillatory motion in the fluid. The amplitude and phase of oscillations depends on the rheology of the fluid as well as on the other parameters coming through imposed boundary conditions, inclusion of body force term and permeability of the <span class="hlt">porous</span> medium. It is found that amplitude of flow velocity increases with increasing viscoelastic and mass suction/injection parameters. However, it decreases with increasing the strength of the applied magnetic field. Moreover, the temperature of fluid is a decreasing function of viscoelastic parameter, mass suction/injection parameter and Prandtl number. PMID:26657931</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19990027885&hterms=Material+densities&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3DMaterial%2Bdensities','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19990027885&hterms=Material+densities&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3DMaterial%2Bdensities"><span id="translatedtitle">Advanced <span class="hlt">Porous</span> Coating for Low-Density Ceramic Insulation Materials</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Leiser, Daniel B.; Churchward, Rex; Katvala, Victor; Stewart, David; Balter, Aliza</p> <p>1988-01-01</p> <p>The need for improved coatings on low-density reusable surface insulation (RSI) materials used on the space shuttle has stimulated research into developing tougher coatings. The processing of a new <span class="hlt">porous</span> composite "coating" for RST called toughened unipiece fibrous insulation Is discussed. Characteristics including performance in a simulated high-speed atmospheric entry, morphological structure before and after this exposure, resistance to <span class="hlt">Impact</span>, and thermal response to a typical heat pulse are described. It is shown that this coating has improved <span class="hlt">impact</span> resistance while maintaining optical and thermal properties comparable to the previously available reaction-cured glass coating.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005APS..SHK.T2005C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005APS..SHK.T2005C"><span id="translatedtitle">A Compaction Model for Highly <span class="hlt">Porous</span> Silica Powder.</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Church, P. D.; Tsembelis, K.</p> <p>2005-07-01</p> <p>This paper describes research to develop an equation of state to describe the behaviour of a highly <span class="hlt">porous</span> silica powder. It shows that whilst molecular modelling techniques can be readily applied to develop a description of a compact material the description of the compaction process is more problematic. An empirical model, based upon the Lennard-Jones potential, has been shown to be capable of describing the compaction process observed in simple experiments. This development and application of the model in the Eulerian hydrocode GRIM to reproduce experimental plate <span class="hlt">impact</span> data over a wide range of <span class="hlt">impact</span> velocities is described and the results compared with experimental data.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1234217','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1234217"><span id="translatedtitle">A Scoping Analysis Of The <span class="hlt">Impact</span> Of SiC Cladding On Late-Phase Accident Progression <span class="hlt">Involving</span> Core–Concrete Interaction</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Farmer, M. T.</p> <p>2015-11-01</p> <p>The overall objective of the current work is to carry out a scoping analysis to determine the <span class="hlt">impact</span> of ATF on late phase accident progression; in particular, the molten core-concrete interaction portion of the sequence that occurs after the core debris fails the reactor vessel and relocates into containment. This additional study augments previous work by including kinetic effects that govern chemical reaction rates during core-concrete interaction. The specific ATF considered as part of this study is SiC-clad UO<sub>2</sub>.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li class="active"><span>14</span></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_14 --> <div id="page_15" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li class="active"><span>15</span></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="281"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/23313642','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/23313642"><span id="translatedtitle">Platelets self-assemble into <span class="hlt">porous</span> nacre during freeze casting.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Hunger, Philipp M; Donius, Amalie E; Wegst, Ulrike G K</p> <p>2013-03-01</p> <p>Nacre possesses a remarkable combination of mechanical properties. Its high stiffness, strength and toughness are attributed to a highly aligned structure of aragonite platelets "glued" together by a small fraction (∼5vol%) of polymer; theoretically it can be described by a shear-lag model of staggered tensile elements between which loads are transferred via shear. Despite extensive research, it has not been possible yet to manufacture this aligned structure as a bulk material of considerable volume with a fast and easy production process. Particularly <span class="hlt">porous</span> materials would benefit from enhanced wall material properties to compensate for performance loss due to their high porosity. An important application for such <span class="hlt">porous</span> materials are tissue scaffolds for bone substitution. Bone, like nacre, exhibits excellent mechanical properties, particularly an exceptionally high toughness, because of its composite structure of hydroxyapatite platelets aligned in a ∼35vol% polymer matrix. Through the freeze casting process, which results in a fast and straightforward self-assembly of platelet-shaped particles during directional solidification, highly <span class="hlt">porous</span> bulk materials with nacre-like cell walls can now be created. This <span class="hlt">porous</span> nacre outperforms by a factor of 1.5-4 in terms of stiffness, strength and toughness materials that have the same amount of porosity but do not exhibit the nacre-like microarchitecture. The self-assembly process presented in this study thus has tremendous potential for the creation of highly <span class="hlt">porous</span>, yet mechanically strong tissue scaffolds for low or medium load bearing bone substitute materials. Due to the versatility of the freeze casting process, materials with a self-assembled cell wall structure can be created from high-aspect ratio particles of all material classes. This enables material optimization for a great variety of applications such as <span class="hlt">impact</span> protection, filtration, catalysis, energy generation and storage, in addition to those with</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4516172','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4516172"><span id="translatedtitle">NEIGHBORHOOD CHARACTERISTICS AND SEXUAL INTIMATE PARTNER VIOLENCE AGAINST WOMEN AMONG LOW-INCOME, DRUG-<span class="hlt">INVOLVED</span> NEW YORK CITY RESIDENTS: RESULTS FROM THE <span class="hlt">IMPACT</span> STUDIES</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Frye, Victoria; Blaney, Shannon; Cerda, Magdalena; Vlahov, David; Galea, Sandro; Ompad, Danielle C.</p> <p>2015-01-01</p> <p>We assessed relations among neighborhood characteristics and sexual intimate partner violence against women (SIPVAW), among low-income, drug-<span class="hlt">involved</span>, women (N=360) and men (N=670) in New York City between 2005 and 2009. Six percent of women (n=22) and 5% of men (n=33) reported experiencing and perpetrating SIPVAW in the past year with a main partner. In adjusted mixed models among women, neighborhood ethnic heterogeneity was significantly, negatively associated with SIPVAW victimization. In adjusted logistic models among men, neighborhood collective efficacy was significantly, positively associated with SIPVAW perpetration. Novel theoretical frameworks are needed to guide research on neighborhoods and partner violence. PMID:25062819</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/27328208','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27328208"><span id="translatedtitle">Nanoparticle dispersion in disordered <span class="hlt">porous</span> media with and without polymer additives.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Babayekhorasani, Firoozeh; Dunstan, Dave E; Krishnamoorti, Ramanan; Conrad, Jacinta C</p> <p>2016-06-29</p> <p>In purely viscous Newtonian fluids, mechanical mixing of the fluid stream as it moves through an unstructured <span class="hlt">porous</span> medium controls the long-time dispersion of molecular tracers. In applications ranging from environmental remediation to materials processing, however, particles are transported through <span class="hlt">porous</span> media in polymer solutions and melts, for which the fluid properties depend on the shear rate and extent of deformation. How the flow characteristics of polymer solutions affect the spreading of finite-sized particles remains poorly understood - both on the microscopic scale as local velocity profiles, and on the macroscale as dispersion. Here, we show across a range of flow rates and disordered <span class="hlt">porous</span> media configurations that the long-time transport coefficients of particles flowed in water, in a viscous Newtonian fluid, and in a non-Newtonian shear-thinning polymer solution collapse onto scaling curves, independent of the fluid rheology. Thus the addition of polymer does not <span class="hlt">impact</span> nanoparticle dispersion through disordered <span class="hlt">porous</span> media. PMID:27328208</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016Fract..2450013L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016Fract..2450013L"><span id="translatedtitle">Analysis of Fractional Flow for Transient Two-Phase Flow in Fractal <span class="hlt">Porous</span> Medium</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lu, Ting; Duan, Yonggang; Fang, Quantang; Dai, Xiaolu; Wu, Jinsui</p> <p>2016-03-01</p> <p>Prediction of fractional flow in fractal <span class="hlt">porous</span> medium is important for reservoir engineering and chemical engineering as well as hydrology. A physical conceptual fractional flow model of transient two-phase flow is developed in fractal <span class="hlt">porous</span> medium based on the fractal characteristics of pore-size distribution and on the approximation that <span class="hlt">porous</span> medium consist of a bundle of tortuous capillaries. The analytical expression for fractional flow for wetting phase is presented, and the proposed expression is the function of structural parameters (such as tortuosity fractal dimension, pore fractal dimension, maximum and minimum diameters of capillaries) and fluid properties (such as contact angle, viscosity and interfacial tension) in fractal <span class="hlt">porous</span> medium. The sensitive parameters that influence fractional flow and its derivative are formulated, and their <span class="hlt">impacts</span> on fractional flow are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/5328729','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/biblio/5328729"><span id="translatedtitle"><span class="hlt">Porous</span>-electrode preparation method</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Arons, R.M.; Dusek, J.T.</p> <p>1981-09-17</p> <p>A <span class="hlt">porous</span> sintered plaque is provided with a bimodal porosity that is especially well suited for use as an electrode within a molten carbonate fuel cell. The coarse porosity is sufficient for admitting gases into contact with the reaction surfaces while the fine porosity is wetted with and retains molten electrolyte on the reaction sites. The electrode structure is prepared by providing a very fine powder such as nickel oxide and blending the powder with a suitable decomposable binder to form a solid mass. The mass is comminuted into agglomerate size particles substantially larger than the fine oxide particles and formed into a cohesive compact for subsequent sintering. Sintering is carried out at sufficient conditions to bind the agglomerates together into a <span class="hlt">porous</span> structure having both coarse and fine porosity. Where lithiated nickel oxide cathodes are prepared, the sintering conditions can be moderate enough to retain substantial quantities of lithium within the electrode for adequate conductivity.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/7278897','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/biblio/7278897"><span id="translatedtitle">Metal recovery from <span class="hlt">porous</span> materials</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Sturcken, E.F.</p> <p>1992-10-13</p> <p>A method is described for recovering plutonium and other metals from materials by leaching comprising the steps of incinerating the materials to form a <span class="hlt">porous</span> matrix as the residue of incineration, immersing the matrix into acid in a microwave-transparent pressure vessel, sealing the pressure vessel, and applying microwaves so that the temperature and the pressure in the pressure vessel increase. The acid for recovering plutonium can be a mixture of HBF[sub 4] and HNO[sub 3] and preferably the pressure is increased to at least 100 PSI and the temperature to at least 200 C. The <span class="hlt">porous</span> material can be pulverized before immersion to further increase the leach rate.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/361821','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/361821"><span id="translatedtitle">Novel hollow powder <span class="hlt">porous</span> structures</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Sypeck, D.J.; Parrish, P.A.; Wadley, H.N.G.</p> <p>1998-12-31</p> <p>Recent finite element calculations indicate that structures constructed from partially compacted hollow spheres exhibit a greater stiffness and strength than many other cellular structures at comparable density. It has been observed that gas atomization of metallic powders often leads to entrapment of the flow field gas. The resulting hollow powders are an unwanted by-product in the sense that they lead to porosity and future sites of defect in solid parts. Here a method is developed to separate the hollow powders according to their size, shape and density. They are then consolidated to a <span class="hlt">porous</span> structure. Examples of this are given for both a titanium alloy and a nickel-base superalloy. The compressive mechanical properties are measured and compared to those of other <span class="hlt">porous</span> structures.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006SPIE.6159E..23D&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006SPIE.6159E..23D&link_type=ABSTRACT"><span id="translatedtitle"><span class="hlt">Porous</span> glasses for optical sensors</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Dorosz, Dominik; Procyk, Bernadeta</p> <p>2006-03-01</p> <p>Microporous glasses from the Na II0-B II0 3-Si0 II system can be obtained by appropriate thermal and chemical treatment. During the thermal treatment the separation of the borate phase from the silicon skeleton has been occurred. The borates are in the form small drops joined to each other. In the course of chemical treatment the borates become leached in water, water solutions of acids or basis and the glass becomes <span class="hlt">porous</span>. Microporous glasses may find application in many branches of science and engineering. The applications depend on the internal arrangement, size and shape of pores. These parameters may be in a wide range modified by a change of the chemical composition. The received <span class="hlt">porous</span> glass was used as an element in optical fibre NO II sensor. The specific coloration reaction between organic reagents and NO II in the pores was occurred. It is possible to detection of 10-50 ppm NO II level.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26732708','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26732708"><span id="translatedtitle">Fe2+ chelator proferrorosamine A: a gene cluster of Erwinia rhapontici P45 <span class="hlt">involved</span> in its synthesis and its <span class="hlt">impact</span> on growth of Erwinia amylovora CFBP1430.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Born, Yannick; Remus-Emsermann, Mitja N P; Bieri, Marco; Kamber, Tim; Piel, Jörn; Pelludat, Cosima</p> <p>2016-02-01</p> <p>Proferrorosamine A (proFRA) is an iron (Fe2+) chelator produced by the opportunistic plant pathogen Erwinia rhapontici P45. To identify genes <span class="hlt">involved</span> in proFRA synthesis, transposon mutagenesis was performed. The identified 9.3 kb gene cluster, comprising seven genes, designated rosA-rosG, encodes proteins that are <span class="hlt">involved</span> in proFRA synthesis. Based on gene homologies, a biosynthetic pathway model for proFRA is proposed. To obtain a better understanding of the effect of proFRA on non-proFRA producing bacteria, E. rhapontici P45 was co-cultured with Erwinia amylovora CFBP1430, a fire-blight-causing plant pathogen. E. rhapontici P45, but not corresponding proFRA-negative mutants, led to a pink coloration of E. amylovora CFBP1430 colonies on King's B agar, indicating accumulation of the proFRA-iron complex ferrorosamine, and growth inhibition in vitro. By saturating proFRA-containing extracts with Fe2+, the inhibitory effect was neutralized, suggesting that the iron-chelating capability of proFRA is responsible for the growth inhibition of E. amylovora CFBP1430. PMID:26732708</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/7189244','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/7189244"><span id="translatedtitle">Theoretical studies of non-Newtonian and Newtonian fluid flow through <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Wu, Yu-Shu.</p> <p>1990-02-01</p> <p>A comprehensive theoretical study has been carried out on the flow behavior of both single and multiple phase non-Newtonian fluids in <span class="hlt">porous</span> media. This work is divided into three parts: development of numerical and analytical solutions; theoretical studies of transient flow of non-Newtonian fluids in <span class="hlt">porous</span> media; and applications of well test analysis and displacement efficiency evaluation to field problems. A fully implicit, integral finite difference model has been developed for simulation of non-Newtonian and Newtonian fluid flow through <span class="hlt">porous</span> media. Several commonly-used rheological models of power-law and Bingham plastic non-Newtonian fluids have been incorporated in the simulator. A Buckley-Leverett type analytical solution for one-dimensional, immiscible displacement <span class="hlt">involving</span> non-Newtonian fluids in <span class="hlt">porous</span> media has been developed. An integral method is also presented for the study of transient flow of Bingham fluids in <span class="hlt">porous</span> media. In addition, two well test analysis methods have been developed for analyzing pressure transient tests of power-law and Bingham fluids, respectively. Applications are included to demonstrate this new technology. The physical mechanisms <span class="hlt">involved</span> in immiscible displacement with non-Newtonian fluids in <span class="hlt">porous</span> media have been studied using the Buckley-Leverett type analytical solution. In another study, an idealized fracture model has been used to obtain some insights into the flow of a power-law fluid in a double-porosity medium. Transient flow of a general pseudoplastic fluid has been studied numerically. 125 refs., 91 figs., 12 tabs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JGRB..120.1605A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JGRB..120.1605A"><span id="translatedtitle">Permeability of compacting <span class="hlt">porous</span> lavas</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ashwell, P. A.; Kendrick, J. E.; Lavallée, Y.; Kennedy, B. M.; Hess, K.-U.; Aulock, F. W.; Wadsworth, F. B.; Vasseur, J.; Dingwell, D. B.</p> <p>2015-03-01</p> <p>The highly transient nature of outgassing commonly observed at volcanoes is in part controlled by the permeability of lava domes and shallow conduits. Lava domes generally consist of a <span class="hlt">porous</span> outer carapace surrounding a denser lava core with internal shear zones of variable porosity. Here we examine densification using uniaxial compression experiments on variably crystalline and <span class="hlt">porous</span> rhyolitic dome lavas from the Taupo Volcanic Zone. Experiments were conducted at 900°C and an applied stress of 3 MPa to 60% strain, while monitoring acoustic emissions to track cracking. The evolution of the <span class="hlt">porous</span> network was assessed via X-ray computed tomography, He-pycnometry, and relative gas permeability. High starting connected porosities led to low apparent viscosities and high strain rates, initially accompanied by abundant acoustic emissions. As compaction ensued, the lavas evolved; apparent viscosity increased and strain rate decreased due to strain hardening of the suspensions. Permeability fluctuations resulted from the interplay between viscous flow and brittle failure. Where phenocrysts were abundant, cracks had limited spatial extent, and pore closure decreased axial and radial permeability proportionally, maintaining the initial anisotropy. In crystal-poor lavas, axial cracks had a more profound effect, and permeability anisotropy switched to favor axial flow. Irrespective of porosity, both crystalline samples compacted to a threshold minimum porosity of 17-19%, whereas the crystal-poor sample did not achieve its compaction limit. This indicates that unconfined loading of <span class="hlt">porous</span> dome lavas does not necessarily form an impermeable plug and may be hindered, in part by the presence of crystals.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016PhRvP...5d4020M&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016PhRvP...5d4020M&link_type=ABSTRACT"><span id="translatedtitle">Large Deformations of a Soft <span class="hlt">Porous</span> Material</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>MacMinn, Christopher W.; Dufresne, Eric R.; Wettlaufer, John S.</p> <p>2016-04-01</p> <p>Compressing a <span class="hlt">porous</span> material will decrease the volume of the pore space, driving fluid out. Similarly, injecting fluid into a <span class="hlt">porous</span> material can expand the pore space, distorting the solid skeleton. This poromechanical coupling has applications ranging from cell and tissue mechanics to geomechanics and hydrogeology. The classical theory of linear poroelasticity captures this coupling by combining Darcy's law with Terzaghi's effective stress and linear elasticity in a linearized kinematic framework. Linear poroelasticity is a good model for very small deformations, but it becomes increasingly inappropriate for moderate to large deformations, which are common in the context of phenomena such as swelling and damage, and for soft materials such as gels and tissues. The well-known theory of large-deformation poroelasticity combines Darcy's law with Terzaghi's effective stress and nonlinear elasticity in a rigorous kinematic framework. This theory has been used extensively in biomechanics to model large elastic deformations in soft tissues and in geomechanics to model large elastoplastic deformations in soils. Here, we first provide an overview and discussion of this theory with an emphasis on the physics of poromechanical coupling. We present the large-deformation theory in an Eulerian framework to minimize the mathematical complexity, and we show how this nonlinear theory simplifies to linear poroelasticity under the assumption of small strain. We then compare the predictions of linear poroelasticity with those of large-deformation poroelasticity in the context of two uniaxial model problems: fluid outflow driven by an applied mechanical load (the consolidation problem) and compression driven by a steady fluid throughflow. We explore the steady and dynamical errors associated with the linear model in both situations, as well as the <span class="hlt">impact</span> of introducing a deformation-dependent permeability. We show that the error in linear poroelasticity is due primarily to kinematic</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015NRL....10..384T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015NRL....10..384T"><span id="translatedtitle">Fabrication and Characterization of Monodisperse Magnetic <span class="hlt">Porous</span> Nickel Microspheres as Novel Catalysts</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Teng, Chao; He, Jie; Zhu, Lili; Ren, Lianbing; Chen, Jiwei; Hong, Mei; Wang, Yong</p> <p>2015-10-01</p> <p>A facile and efficient hard-templating strategy is reported for the preparation of <span class="hlt">porous</span> nickel microspheres with excellent uniformity and strong magnetism. The strategy <span class="hlt">involves</span> impregnation of <span class="hlt">porous</span> polymer microspheres with nickel precursors, calcination to remove the template, followed by thermal reduction. The morphology, structure, and the property of the Ni microspheres were characterized by scanning electron microscopy, X-ray powder diffraction, N2 adsorption-desorption isotherms, thermogravimetric analysis, and magnetic hysteresis measurement. The obtained <span class="hlt">porous</span> nickel microspheres were monodispersed with a particle size of 0.91 μm and crystallite size of 52 nm. Their saturation magnetization was much higher than that of Ni nanoparticles. The unique <span class="hlt">porous</span> nanostructured Ni microspheres possess catalytic activity and excellent recyclability, as demonstrated in the catalytic reduction of 4-nitrophenol to 4-aminophenol. The micropherical Ni catalysts could be easily separated either by an external magnetic field or by simple filtration.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/27322845','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27322845"><span id="translatedtitle">General Synthesis of <span class="hlt">Porous</span> Mixed Metal Oxide Hollow Spheres with Enhanced Supercapacitive Properties.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wang, Qinghong; Zhu, Yuxuan; Xue, Jing; Zhao, Xinsheng; Guo, Zaiping; Wang, Chao</p> <p>2016-07-13</p> <p><span class="hlt">Porous</span> mixed metal oxide (MMO) hollow spheres present high specific surface areas, abundant electrochemically active sites, and outstanding electrochemical properties, showing potential applications in energy storage. A hydro/solvothermal process, followed by a calcination process, can be a viable method for producing uniform <span class="hlt">porous</span> metal oxide hollow spheres. Unfortunately, this method usually <span class="hlt">involves</span> harsh synthetic conditions such as high temperature and intricate processing. Herein, we report a general and facile "ion adsorption-annealing" approach for the fabrication of uniform <span class="hlt">porous</span> MMO hollow spheres. The size and shell thickness of the as-obtained hollow spheres can be adjusted by the carbohydrate sphere templates and the solution concentration. Electrochemical measurements of the MMO hollow spheres demonstrate excellent supercapacitive properties, which may be due to the small size, ultrathin shells, and fine <span class="hlt">porous</span> structure. PMID:27322845</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26437654','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26437654"><span id="translatedtitle">Fabrication and Characterization of Monodisperse Magnetic <span class="hlt">Porous</span> Nickel Microspheres as Novel Catalysts.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Teng, Chao; He, Jie; Zhu, Lili; Ren, Lianbing; Chen, Jiwei; Hong, Mei; Wang, Yong</p> <p>2015-12-01</p> <p>A facile and efficient hard-templating strategy is reported for the preparation of <span class="hlt">porous</span> nickel microspheres with excellent uniformity and strong magnetism. The strategy <span class="hlt">involves</span> impregnation of <span class="hlt">porous</span> polymer microspheres with nickel precursors, calcination to remove the template, followed by thermal reduction. The morphology, structure, and the property of the Ni microspheres were characterized by scanning electron microscopy, X-ray powder diffraction, N2 adsorption-desorption isotherms, thermogravimetric analysis, and magnetic hysteresis measurement. The obtained <span class="hlt">porous</span> nickel microspheres were monodispersed with a particle size of 0.91 μm and crystallite size of 52 nm. Their saturation magnetization was much higher than that of Ni nanoparticles. The unique <span class="hlt">porous</span> nanostructured Ni microspheres possess catalytic activity and excellent recyclability, as demonstrated in the catalytic reduction of 4-nitrophenol to 4-aminophenol. The micropherical Ni catalysts could be easily separated either by an external magnetic field or by simple filtration. PMID:26437654</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/17187390','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/17187390"><span id="translatedtitle">Combustion synthesis of <span class="hlt">porous</span> biomaterials.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ayers, Reed A; Burkes, Douglas E; Gottoli, Guglielmo; Yi, Hu-Chun; Zhim, Fouad; Yahia, L'hocine; Moore, John J</p> <p>2007-06-01</p> <p>This article discusses the unique material manufacturing process of self-propagating high temperature synthesis (SHS) as applied to the making of <span class="hlt">porous</span> biomaterials. <span class="hlt">Porous</span> materials have long been considered as the first step toward in-vivo bone tissue engineering and the creation of patient life-time implants. The authors have approached this challenge by utilizing combustion synthesis, to create novel materials such as NiTi + TiC as well as <span class="hlt">porous</span> forms of materials that are commonly accepted for biomedical applications such as tricalcium phosphate and hydroxyapatite. In the SHS product, physico-chemical properties are controlled by, but not limited to, reactant stoichiometry; green density; particle size of the reactant mix; use or presence of a gasifying agent; heating rate of the reactants and gravity. By balancing these parameters, the energy of the reaction is controlled to create the desired product stoichiometry, porosity, and mechanical properties. SHS provides a means to rapidly manufacture materials, saving time and production costs as well as enabling the synthesis of custom devices through the use of individual molds. Mold materials can range from graphite to paper or paper machete. Combustion synthesis offers a method for the rapid manufacture of affordable, individual biomedical devices that will reduce patient recovery time. PMID:17187390</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/244538','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/244538"><span id="translatedtitle">Microscale transport in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Rashidi, M.; Rinker, R.</p> <p>1996-04-01</p> <p>In-pore transport processes in homogeneous and heterogeneous <span class="hlt">porous</span> media have been investigated using novel 3D imaging techniques. The experimental system consists of a clear column packed with clear particles and a refractive index-matched fluid seeded with fluorescent tracers and an organic solute dye. By illuminating the <span class="hlt">porous</span> regions within the column with a planar sheet of laser beam, flow and transport processes through the <span class="hlt">porous</span> medium can be observed microscopically, and qualitative and quantitative in-pore transport information can be obtained at a good resolution and a high accuracy. Fluorescent images are captured and recorded at every vertical plane location while sweeping back and forth across the test section. These digitized transport images are then analyzed and accumulated over a 3D volume within the column. This paper reports on pore-scale observations of velocity, chemical concentration, and fluxes. Tests were undertaken with two separate columns. One is a rectangular column for chemical transport and bioremediation studies in aqueous heterogeneous systems and the other is a cylindrical column for flow and transport investigations in nonaqueous homogeneous systems.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6471761','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6471761"><span id="translatedtitle"><span class="hlt">Porous</span> heat-insulation material</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Chentemirov, M.G.; Dyachkovsky, F.S.; Enikolopov, N.S.; Gavrilov, J.A.; Gorbachev, J.G.; Kudinova, O.I.; Lukienko, E.P.; Maklakova, T.A.; Novokshonova, L.A.; Parsamian, L.O.; Poluyanov, A.F.</p> <p>1980-12-23</p> <p>A <span class="hlt">porous</span> heat-insulation material comprising blocks molded from granules of a <span class="hlt">porous</span> mineral filler with a polyolefin coating is described. The coating thickness is 1/1000 to 1/25 of the average granule diameter; in contact regions, said granules are spaced from each other at a distance of from 0.5 to 2.0 of the coating thickness, and the mass ratio between said <span class="hlt">porous</span> mineral filler and said polyolefin is 80-98:20-2, respectively. The material of this invention has a volume mass of from 60 to 250 kg/m/sup 3/. The material features a high plasticity (its flexural strength is as high as 3-4 kgf/cm/sup 2/). The compression strength of the material is 9-1 kgf/cm/sup 2/. The material also has a low thermal conductivity; its thermal conductivity coefficient is 0.03-0.04 kcal/M/h//sup 0/C. The material is substantially non-combustible.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2004SPIE.5506..125A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2004SPIE.5506..125A"><span id="translatedtitle">Photophysical ablation of <span class="hlt">porous</span> silicon</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Aksenov, Valerii P.; Mikhailova, G. N.</p> <p>2004-07-01</p> <p>Laser ablation of <span class="hlt">porous</span> silicon as a function of laser wavelength and width of silicon nanowires was studied in our experiments. The time-resolved evolution of the cloud of the <span class="hlt">porous</span> silicon particles produced by laser ablation is studied in situ by the analysis of the kinetics of photoluminescence signal. The laser ablation of <span class="hlt">porous</span> silicon produced by pulses of 532 nm or 337 nm radiation with addition of synchronized power pulses of 1064 nm radiation. The cloud of the nanometer-sized silicon crystallites had the high enhancement of luminescence quantum efficiency in the red region of spectra. The slow PL kinetics component, which is due to the localized carriers, decays on a millisecond time scale. The squeezed electron-hole plasma heating by IR-laser radiation may produce a damage of silicon nanowires. The fragments of nanowires in cloud must be smaller, than the critical length. The energy of excitation of e-h pair in fragment with contribution of longitude quantum modes must be lower than energy of the excited photons. Particles with lesser length don't absorb excited laser radiation and don't damage. For this case we may speak about the quantum mechanism of laser ablation of nanowires.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007IAUS..236..223B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007IAUS..236..223B"><span id="translatedtitle">Collision and <span class="hlt">impact</span> simulations including porosity</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Benz, Willy; Jutzi, Martin</p> <p>2007-05-01</p> <p>We present a numerical tool based on the Smooth Particle Hydrodynamic (SPH) method which can be used to model <span class="hlt">impacts</span> and collisions <span class="hlt">involving</span> small solid bodies in a strength-dominated regime. This method was already successfully tested at different scales. At small scales, the method was validated by simulating laboratory <span class="hlt">impacts</span>. Our model predicts shapes, locations and velocities of the largest fragment with hight accuracy (Benz and Asphaug, 1994). A natural laboratory for studying collision physics at larger scales is provided by the twenty or more asteroid families identified in the asteroid belt. By simulating classes of collisions, our model was able to reproduce the main characteristics of such families (e.g. Michel et al. 2003). Spacecraft missions and ground-based observations are providing increasing evidence that many or even most asteroids are <span class="hlt">porous</span> (Housenand Holsapple 2003). Porosity may also play an important role in the formation of planets as the dissipative properties of <span class="hlt">porous</span> media will enhance the collisional sticking mechanism required to build planetesimals. We have developed a numerical model suitable for the calculation of shock dynamics and fracture In <span class="hlt">porous</span> media. It is based on the so called P-alpha model (Herrmann 1969) which was adapted for implementation in our SPH <span class="hlt">impact</span> code (Jutzi 2004). We are now capable of performing SPH simulations including fracture AND porosity and can report some very encouraging results. References: Benz and Asphaug (1994), Icarus 107, 98-116 Herrmann W. (1969), J. Appl. Phys. 40, 2490-2499 Michel P., Benz W, Richardson D.C. (2003), Nature 421, 608-611 Housen K.R. and Holsapple K.A., (2003) Icarus 163, 102- 119 Jutzi M. (2004), Diploma thesis, University of Bern.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li class="active"><span>15</span></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_15 --> <div id="page_16" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li class="active"><span>16</span></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="301"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4501219','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4501219"><span id="translatedtitle">Designing and testing lightweight shoulder prostheses with hybrid actuators for movements <span class="hlt">involved</span> in typical activities of daily living and <span class="hlt">impact</span> absorption</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Sekine, Masashi; Kita, Kahori; Yu, Wenwei</p> <p>2015-01-01</p> <p>Unlike forearm amputees, transhumeral amputees have residual stumps that are too small to provide a sufficient range of operation for their prosthetic parts to perform usual activities of daily living. Furthermore, it is difficult for small residual stumps to provide sufficient <span class="hlt">impact</span> absorption for safe manipulation in daily living, as intact arms do. Therefore, substitution of upper limb function in transhumeral amputees requires a sufficient range of motion and sufficient viscoelasticity for shoulder prostheses under critical weight and dimension constraints. We propose the use of two different types of actuators, ie, pneumatic elastic actuators (PEAs) and servo motors. PEAs offer high power-to-weight performance and have intrinsic viscoelasticity in comparison with motors or standard industrial pneumatic cylinder actuators. However, the usefulness of PEAs in large working spaces is limited because of their short strokes. Servo motors, in contrast, can be used to achieve large ranges of motion. In this study, the relationship between the force and stroke of PEAs was investigated. The <span class="hlt">impact</span> absorption of both types of actuators was measured using a single degree-of-freedom prototype to evaluate actuator compliance for safety purposes. Based on the fundamental properties of the actuators identified, a four degree-of-freedom robotic arm is proposed for prosthetic use. The configuration of the actuators and functional parts was designed to achieve a specified range of motion and torque calculated from the results of a simulation of typical movements performed in usual activities of daily living. Our experimental results showed that the requirements for the shoulder prostheses could be satisfied. PMID:26185472</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/18355029','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/18355029"><span id="translatedtitle"><span class="hlt">Porous</span> devices derived from co-continuous polymer blends as a route for controlled drug release.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Salehi, Pouneh; Sarazin, Pierre; Favis, Basil D</p> <p>2008-04-01</p> <p>In this study we examine the release profile of bovine serum albumin (BSA) from a <span class="hlt">porous</span> polymer matrix derived from a co-continuous polymer blend. The porosity is generated through the selective extraction of one of the continuous phases. This is the first study to examine the approach of using morphologically tailored co-continuous polymer blends as a template for generating <span class="hlt">porous</span> polymer materials for use in controlled release. A method for the preparation of polymeric capsules is introduced, and the effect of matrix pore size and surface area on the BSA release profile is investigated. Furthermore, the effect of surface charge on release is examined by surface modification of the <span class="hlt">porous</span> substrate using layer-by-layer deposition techniques. Synthetic, nonerodible polymer, high-density polyethylene (HDPE), was used as a model substrate prepared by melt blending with two different styrene-ethylene-butylene copolymers. Blends with HDPE allow for the preparation of <span class="hlt">porous</span> substrates with small pore sizes (300 and 600 nm). A blend of polylactide (PLA) and polystyrene was also used to prepare <span class="hlt">porous</span> PLA with a larger pore size (1.5 microm). The extents of interconnectivity, surface area, and pore dimension of the prepared <span class="hlt">porous</span> substrates were examined via gravimetric solvent extraction, BET nitrogen adsorption, mercury porosimetry, and image analysis of scanning electron microscopy micrographs. With a loading protocol into the <span class="hlt">porous</span> HDPE and PLA <span class="hlt">involving</span> the alternate application of pressure and vacuum, it is shown that virtually the entire <span class="hlt">porous</span> network was accessible to BSA loading, and loading efficiencies of between 80% and 96% were obtained depending on the pore size of the carrier and the applied pressure. The release profile of BSA from the microporous structure was monitored by UV spectrophotometry. The influence of pore size, surface area, surface charge, and number of deposited layers is demonstrated. It is shown that an effective closed-cell structure</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/183468','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/183468"><span id="translatedtitle">Flow channeling in strongly heterogeneous <span class="hlt">porous</span> media: A numerical study</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Moreno, L.; Tsang, C.F.</p> <p>1994-05-01</p> <p>The variation of hydraulic conductivity in a <span class="hlt">porous</span> medium causes the fluids flowing through it to have nonuniform velocities. Variation in fluid velocity is one of the main contributors to solute dispersion, causing a part of the contaminants dissolved in the fluid to be transported with greater than average velocities. In practical problems concerning transport of radioactive or toxic wastes, the velocity of contaminant flow may be of vital importance. This paper examines a three dimensional case, considering also the similarities and differences between parallel flow and convergent/divergent flow. Fluid flow in a <span class="hlt">porous</span> medium is shown to perfer the most conductive paths. For a medium with strongly variable permeability this effect can be very pronounced. This paper discusses the <span class="hlt">impact</span> of this flow distribution upon solute transport. 28 refs., 11 figs., 2 tabs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/17554596','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/17554596"><span id="translatedtitle">Fabrication and mechanical testing of <span class="hlt">porous</span> calcium phosphate bioceramic granules.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Hsu, Y H; Turner, I G; Miles, A W</p> <p>2007-10-01</p> <p><span class="hlt">Porous</span> hydroxyapatite/tricalcium phosphate (HA/TCP) granules were fabricated by a novel technique of vacuum impregnation of reticulated polyurethane (PU) foams with ceramic slip. The resultant granules had 5-10% interconnected porosity with controlled pore sizes necessary to allow bone ingrowth combined with good mechanical properties. Using PU foams with a different number of pores per inch (ppi), <span class="hlt">porous</span> HA/TCP granules in the size range of 2-8 mm were successfully manufactured. Dieplunger tests were used to compare the compression and relaxation properties of the granules with those of a commercially available bone graft product, BoneSave. The results of the die-plunger testing showed that the experimental granules were stiffer than the BoneSave materials and had less of a tendency to crumble to powder after testing. This therefore suggests that these experimental granules would be useful for <span class="hlt">impaction</span> grafting and space filling applications. PMID:17554596</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/ED104543.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/ED104543.pdf"><span id="translatedtitle">Preparing Teachers for Parent <span class="hlt">Involvement</span>.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Safran, Daniel</p> <p></p> <p>This paper examines the potential <span class="hlt">impact</span> of parent <span class="hlt">involvement</span> in the formal education of their children and suggests ways that teacher education can be restructured to prepare teachers to work with parents. This paper attempts to answer five questions: (1) Why should parents be <span class="hlt">involved</span> in the formal education of their children? (2) Why should…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011AGUFM.B41H..03J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011AGUFM.B41H..03J"><span id="translatedtitle"><span class="hlt">Impact</span> of Scale-Dependent Coupled Processes on Solute Fate and Transport in the Critical Zone: Case Studies <span class="hlt">Involving</span> Inorganic and Radioactive Contaminants</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Jardine, P. M.; Gentry, R. W.</p> <p>2011-12-01</p> <p>Soil, the thin veneer of matter covering the Earths surface that supports a web of living diversity, is often abused through anthropogenic inputs of toxic waste. This subsurface regime, coupled with life sustaining surface water and groundwater is known as the "Critical Zone". The disposal of radioactive and toxic organic and inorganic waste generated by industry and various government agencies has historically <span class="hlt">involved</span> shallow land burial or the use of surface impoundments in unsaturated soils and sediments. Presently, contaminated sites have been closing rapidly and many remediation strategies have chosen to leave contaminants in-place. As such, contaminants will continue to interact with the geosphere and investigations on long term changes and interactive processes is imperative to verify risks. In this presentation we provide a snap-shot of subsurface science research from the past 25 y that seeks to provide an improved understanding and predictive capability of multi-scale contaminant fate and transport processes in heterogeneous unsaturated and saturated environments. Investigations focus on coupled hydrological, geochemical, and microbial processes that control reactive contaminant transport and that <span class="hlt">involve</span> multi-scale fundamental research ranging from the molecular scale (e.g. synchrotrons, electron sources, arrays) to in situ plume interrogation strategies at the macroscopic scale (e.g. geophysics, field biostimulation, coupled processes monitoring). We show how this fundamental research is used to provide multi-process, multi-scale predictive monitoring and modeling tools that can be used at contaminated sites to (1) inform and improve the technical basis for decision making, and (2) assess which sites are amenable to natural attenuation and which would benefit from source zone remedial intervention.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2006SPIE.6037..246D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2006SPIE.6037..246D"><span id="translatedtitle">Nano-explosions in <span class="hlt">porous</span> silicon</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>du Plessis, Monuko; Conradie, Corrie</p> <p>2006-01-01</p> <p>The explosive properties of <span class="hlt">porous</span>-silicon, impregnated with an oxidant, were researched. The electrochemical etching of <span class="hlt">porous</span> silicon layers was investigated, and a <span class="hlt">porous</span> layer structural model is proposed to model the pore and crystallite dimensions of the <span class="hlt">porous</span> layer. A gravimetric experimental technique is described whereby the pore dimensions and specific surface area can be determined. A new relationship between pore size and specific surface area was established. The types of oxidants and their properties, as well as the impregnation of the <span class="hlt">porous</span> layers by different oxidants, were researched. It was observed that the filling of the pores by the oxidant is a function of pore diameter, specific surface area and type of oxidant used. The experimentally observed explosive properties are a function of silicon resistivity, <span class="hlt">porous</span> layer porosity and pore dimensions. It was found that there is an optimum pore size for the most energetic explosion. Future applications for this new technology are proposed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20130000617','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20130000617"><span id="translatedtitle">Thermally conductive <span class="hlt">porous</span> element-based recuperators</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Du, Jian Hua (Inventor); Chow, Louis C (Inventor); Lin, Yeong-Ren (Inventor); Wu, Wei (Inventor); Kapat, Jayanta (Inventor); Notardonato, William U. (Inventor)</p> <p>2012-01-01</p> <p>A heat exchanger includes at least one hot fluid flow channel comprising a first plurality of open cell <span class="hlt">porous</span> elements having first gaps there between for flowing a hot fluid in a flow direction and at least one cold fluid flow channel comprising a second plurality of open cell <span class="hlt">porous</span> elements having second gaps therebetween for flowing a cold fluid in a countercurrent flow direction relative to the flow direction. The thermal conductivity of the <span class="hlt">porous</span> elements is at least 10 W/mK. A separation member is interposed between the hot and cold flow channels for isolating flow paths associated these flow channels. The first and second plurality of <span class="hlt">porous</span> elements at least partially overlap one another to form a plurality of heat transfer pairs which transfer heat from respective ones of the first <span class="hlt">porous</span> elements to respective ones of the second <span class="hlt">porous</span> elements through the separation member.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/10184586','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10184586"><span id="translatedtitle">Scaling of bubble growth in a <span class="hlt">porous</span> medium</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Satik, C.; Li, X.; Yortsos, Y.C.</p> <p>1994-09-01</p> <p>Processes <span class="hlt">involving</span> liquid-to-gas phase change in <span class="hlt">porous</span> media are routinely encountered. Growth of a gas phase by solute diffusion in the liquid is typical of the `solution gas-drive` process for the recovery of oil. The growth of a single gas cluster in a <span class="hlt">porous</span> medium driven by a constant supersaturation is examined. Patterns and rates of growth are derived. It is shown that the growth pattern is not compact and changes from pure percolation to pure Diffusion-Limited-Aggregation (DLA) as the size of the cluster increases. The scaling of the cluster sizes that delineate these patterns, with supersaturation and diffusivity is presented for the case of quasi-static diffusion. In 3-D, the diffusive growth law is found to be R{sub g} {approximately} t{sup 2/3}, which is different than the classical R{sub g} {approximately} t{sup 1/2}.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1162233','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1162233"><span id="translatedtitle">Final Report - Montana State University - Microbial Activity and Precipitation at Solution-Solution Mixing Zones in <span class="hlt">Porous</span> Media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Gerlach, Robin</p> <p>2014-10-31</p> <p>Background. The use of biological and chemical processes that degrade or immobilize contaminants in subsurface environments is a cornerstone of remediation technology. The enhancement of biological and chemical processes in situ, <span class="hlt">involves</span> the transport, displacement, distribution and mixing of one or more reactive agents. Biological and chemical reactions all require diffusive transport of solutes to reaction sites at the molecular scale and accordingly, the success of processes at the meter-scale and larger is dictated by the success of phenomena that occur at the micron-scale. However, current understanding of scaling effects on the mixing and delivery of nutrients in biogeochemically dynamic <span class="hlt">porous</span> media systems is limited, despite the limitations this imposes on the efficiency and effectiveness of the remediation challenges at hand. Objectives. We therefore proposed to experimentally characterize and computationally describe the growth, evolution, and distribution of microbial activity and mineral formation as well as changes in transport processes in <span class="hlt">porous</span> media that receive two or more reactive amendments. The model system chosen for this project was based on a method for immobilizing 90Sr, which <span class="hlt">involves</span> stimulating microbial urea hydrolysis with ensuing mineral precipitation (CaCO3), and co-precipitation of Sr. Studies at different laboratory scales were used to visualize and quantitatively describe the spatial relationships between amendment transport and consumption that stimulate the production of biomass and mineral phases that subsequently modify the permeability and heterogeneity of <span class="hlt">porous</span> media. Biomass growth, activity, and mass deposition in mixing zones was investigated using two-dimensional micro-model flow cells as well as flow cells that could be analyzed using synchrotron-based x-ray tomography. Larger-scale flow-cell experiments were conducted where the spatial distribution of media properties, flow, segregation of biological activity and</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012Tectp.576..116B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012Tectp.576..116B"><span id="translatedtitle"><span class="hlt">Impact</span> of fracture stratigraphy on the paleo-hydrogeology of the Madison Limestone in two basement-<span class="hlt">involved</span> folds in the Bighorn basin, (Wyoming, USA)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Barbier, Mickael; Leprêtre, Rémi; Callot, Jean-Paul; Gasparrini, Marta; Daniel, Jean-Marc; Hamon, Youri; Lacombe, Olivier; Floquet, Marc</p> <p>2012-11-01</p> <p>Based on the study of the Madison Limestone at Sheep Mountain and Rattlesnake Mountain, a unique outcrop dataset including (1) facies and diagenetic analyses, (2) vertical persistence and cement stratigraphy of vein sets and (3) fluid inclusions thermometry are used to demonstrate the <span class="hlt">impact</span> of folding and fracturing on paleo-hydrogeology. Quantification of the vertical persistence of fractures shows that Sheep Mountain and Rattlesnake Mountain differ by the vertical persistence of the pre-folding Laramide vein sets, which are strictly bed-confined in Sheep Mountain but cut across bedding at Rattlesnake Mountain, whereas the syn-folding veins are through-going in both. The emplacement chronology and the various sources of the fluids responsible for the paragenetic sequence are based on isotope chemistry and fluid inclusions analysis of the matrix and vein cements. At Sheep Mountain and Rattlesnake Mountain, the cements related to the burial are characterized by isotopic signatures of marine formation waters that were diluted during the karstification of the Madison Platform at the end of Mississippian. Meteoric fluids, presumably migrating during the Cenomanian from Wind River Range and Teton Range, recharge zones located in the south-west of the Bighorn Basin, were remobilized in the early bed-confined and through-going syn-folding veins of the Sheep Mountain Anticline. The former vein set drained only local fluids whose isotopic signature relates to an increase of temperature of the meteoric fluids during their migration, whereas the latter set allowed quick drainage of basinal fluids.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25991267','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25991267"><span id="translatedtitle">The <span class="hlt">Impact</span> of eHealth and mHealth on doctor behavior and patient <span class="hlt">involvement</span>: an Israeli and Portuguese comparative approach.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Catan, Gabriel; Espanha, Rita; Veloso Mendes, Rita; Toren, Orly; Chinitz, David</p> <p>2015-01-01</p> <p>Based on the experience of a Short Term Scientific Mission (STSM) promoted by COST Net and developed in CIES/ISCTE-IUL (Portugal), this paper presents a reflection about the implementation of Information & Communication Technologies (ICT) in the healthcare sector in Israel and Portugal. Specifically, we focus on the <span class="hlt">impacts</span> of ICT or eHealth on patient empowerment, as perceived by doctors and managers in order to better comprehend the role of national policy and explore the options for building a national strategy regarding ICT in healthcare. The experience of the Portuguese healthcare system was selected and compared to the results found in a similar research in Israel. Methodologically, in-depth interviews with the Ministry of Health, the private sector, patients associations and researches were used to collect data. Purposeful sampling was used to select respondents, and secondary sources were used for triangulation. The findings of the research work show that the increased deployment of ICT has furthered patient empowerment (1). From the doctors' perspective, while ICT has provided more information in the long-run, changes of these magnitudes were not easy in the beginning. These findings were similar in both countries. The work concludes that ICT tools were successfully implemented and the general perception is that they have been beneficial. The work provides information in order to understand and improve ICT services. Additionally, the results suggest alternatives for future investments in these technologies. PMID:25991267</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26663760','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26663760"><span id="translatedtitle">Prevalence of Cervical Enamel Projection and Its <span class="hlt">Impact</span> on Furcation <span class="hlt">Involvement</span> in Mandibular Molars: A Cone-Beam Computed Tomography Study in Koreans.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Lim, Hyun-Chang; Jeon, Seok-Kyun; Cha, Jae-Kook; Lee, Jung-Seok; Choi, Seong-Ho; Jung, Ui-Won</p> <p>2016-03-01</p> <p>This study evaluated the prevalence of cervical enamel projections (CEPs) in mandibular molars, and analyzed the correlation between CEPs and furcation <span class="hlt">involvement</span> (FI) based on cone-beam computed tomography (CBCT) data in a Korean population. CBCT images obtained from March 2012 to August 2012 were analyzed. CEPs and FI on the buccal and lingual surface were classified in three-dimensionally reconstructed images and cross-sectional views, and the correlation between these two parameters was analyzed. In total, 982 teeth in 425 patients were analyzed. The overall prevalence rate of CEPs was 76% (71% and 27% on the buccal and lingual surfaces, respectively). Grade I CEPs were the most common, followed by CEPs of grades II and III. There was a statistically significant, but negligible correlation between the CEP grade and the degree of FI on the buccal and lingual surfaces. Within the limitations of this cross-sectional study, a high prevalence of CEPs were found in a Korean population, but the role of CEPs in provoking FI appeared not to be decisive. PMID:26663760</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4300437','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4300437"><span id="translatedtitle">Breastfeeding Initiation and Duration in First-Time Mothers: Exploring the <span class="hlt">Impact</span> of Father <span class="hlt">Involvement</span> in the Early Post-Partum Period</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Hunter, Theresa; Cattelona, Georg’ann</p> <p>2014-01-01</p> <p>Background: The early post-partum period is a crucial time for breastfeeding support. Mothers who have physical and emotional support during this period are more likely to be successful in breastfeeding. This study examined the relationship between father <span class="hlt">involvement</span> and support for breast feeding initiation and duration in first-time mothers. Methods: Overall, 146 women who attended a childbirth education class or breastfeeding course at BABS were asked to fill out the Childbirth Experiences Survey, which explored key topics such as (1) breastfeeding initiation, (2) early post-partum breastfeeding, (3) breastfeeding plan, (4) post-partum breastfeeding support and (5) breast feeding duration. This was a voluntary self-reported ques­tionnaire. The surveys were completed by the mothers during the post-partum period. Results: 45.9% (n=67) of mothers received helped from their husband or part­ner with breastfeeding while in the hospital, while 54.1% (n=79) of mothers did not receive support from their partners. Mothers who received early post-par­tum breastfeeding support were more likely to continue breastfeeding after leaving the hospital. Conclusion: First-time mothers who identified as having breastfeeding support from their partners, the infant’s father, during the early post-partum period were more likely to initiate breastfeeding and had longer breastfeeding durations. PMID:25649998</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013EML.....9..783C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013EML.....9..783C"><span id="translatedtitle">Bimodal <span class="hlt">porous</span> gold opals for molecular sensing</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chae, Weon-Sik; Yu, Hyunung; Ham, Sung-Kyoung; Lee, Myung-Jin; Jung, Jin-Seung; Robinson, David B.</p> <p>2013-11-01</p> <p>We have fabricated bimodal <span class="hlt">porous</span> gold skeletons by double-templating routes using poly(styrene) colloidal opals as templates. The fabricated gold skeletons show a bimodal pore-size distribution, with small pores within spheres and large pores between spheres. The templated bimodal <span class="hlt">porous</span> gold skeletons were applied in Raman scattering experiments to study sensing efficiency for probe molecules. We found that the bimodal <span class="hlt">porous</span> gold skeletons showed obvious enhancement of Raman scattering signals versus that of the unimodal <span class="hlt">porous</span> gold which only has interstitial pores of several hundred nanometers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6406258','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6406258"><span id="translatedtitle">Effective permeabilities for model heterogeneous <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Otevo, C.; Rusinek, I. ); Saez, A.E. )</p> <p>1990-01-01</p> <p>This paper presents a technique to evaluate effective absolute permeabilities for heterogeneous <span class="hlt">porous</span> media. The technique is based on a perturbation analysis of the equations of motion of a slightly compressible fluid in a homogeneous <span class="hlt">porous</span> medium at low Reynolds numbers. The effective permeabilities can be calculated once the local geometry of the heterogeneous medium is specified. The technique is used to evaluate two- and three-dimensional effective vertical permeabilities in <span class="hlt">porous</span> media with shale intercalations, including the case in which the <span class="hlt">porous</span> matrix is anisotropic.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25811970','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25811970"><span id="translatedtitle">Foam drainage placed on a <span class="hlt">porous</span> substrate.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Arjmandi-Tash, O; Kovalchuk, N; Trybala, A; Starov, V</p> <p>2015-05-14</p> <p>A model for drainage/imbibition of a foam placed on the top of a <span class="hlt">porous</span> substrate is presented. The equation of liquid imbibition into the <span class="hlt">porous</span> substrate is coupled with a foam drainage equation at the foam/<span class="hlt">porous</span> substrate interface. The deduced dimensionless equations are solved using a finite element method. It was found that the kinetics of foam drainage/imbibition depends on three dimensionless numbers and the initial liquid volume fraction. The result shows that there are three different regimes of the process. Each regime starts after initial rapid decrease of a liquid volume fraction at the foam/<span class="hlt">porous</span> substrate interface: (i) rapid imbibition: the liquid volume fraction inside the foam at the foam/<span class="hlt">porous</span> substrate interface remains constant close to a final liquid volume fraction; (ii) intermediate imbibition: the liquid volume fraction at the interface with the <span class="hlt">porous</span> substrate experiences a peak point and imbibition into the <span class="hlt">porous</span> substrate is slower as compared with the drainage; (iii) slow imbibition: the liquid volume fraction at the foam/<span class="hlt">porous</span> substrate interface increases to a maximum limiting value and a free liquid layer is formed between the foam and the <span class="hlt">porous</span> substrate. However, the free liquid layer disappears after some time. The transition points between these three different drainage/imbibition regimes were delineated by introducing two dimensionless numbers. PMID:25811970</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1255215','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1255215"><span id="translatedtitle"><span class="hlt">Porous</span> media heat transfer for injection molding</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Beer, Neil Reginald</p> <p>2016-05-31</p> <p>The cooling of injection molded plastic is targeted. Coolant flows into a <span class="hlt">porous</span> medium disposed within an injection molding component via a <span class="hlt">porous</span> medium inlet. The <span class="hlt">porous</span> medium is thermally coupled to a mold cavity configured to receive injected liquid plastic. The <span class="hlt">porous</span> medium beneficially allows for an increased rate of heat transfer from the injected liquid plastic to the coolant and provides additional structural support over a hollow cooling well. When the temperature of the injected liquid plastic falls below a solidifying temperature threshold, the molded component is ejected and collected.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19930000586&hterms=transpiration&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dtranspiration','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19930000586&hterms=transpiration&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dtranspiration"><span id="translatedtitle">Transpiration Control Of Aerodynamics Via <span class="hlt">Porous</span> Surfaces</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Banks, Daniel W.; Wood, Richard M.; Bauer, Steven X. S.</p> <p>1993-01-01</p> <p>Quasi-active <span class="hlt">porous</span> surface used to control pressure loading on aerodynamic surface of aircraft or other vehicle, according to proposal. In transpiration control, one makes small additions of pressure and/or mass to cavity beneath surface of <span class="hlt">porous</span> skin on aerodynamic surface, thereby affecting rate of transpiration through <span class="hlt">porous</span> surface. <span class="hlt">Porous</span> skin located on forebody or any other suitable aerodynamic surface, with cavity just below surface. Device based on concept extremely lightweight, mechanically simple, occupies little volume in vehicle, and extremely adaptable.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/24530616','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/24530616"><span id="translatedtitle">The <span class="hlt">impact</span> of youth, family, peer and neighborhood risk factors on developmental trajectories of risk <span class="hlt">involvement</span> from early through middle adolescence.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wang, Bo; Deveaux, Lynette; Li, Xiaoming; Marshall, Sharon; Chen, Xinguang; Stanton, Bonita</p> <p>2014-04-01</p> <p>Few studies have analyzed the development course beginning in pre-/early adolescence of overall engagement in health-risk behaviors and associated social risk factors that place individuals in different health-risk trajectories through mid-adolescence. The current longitudinal study identified 1276 adolescents in grade six and followed them for three years to investigate their developmental trajectories of risk behaviors and to examine the association of personal and social risk factors with each trajectory. Group-based trajectory modeling was applied to identify distinctive trajectory patterns of risk behaviors. Multivariate multinomial logistic regression analyses were performed to examine the effects of the personal and social risk factors on adolescents' trajectories. Three gender-specific behavioral trajectories were identified for males (55.3% low-risk, 37.6% moderate-risk, increasing, and 7.1% high-risk, increasing) and females (41.4% no-risk, 53.4% low-risk, increasing and 5.2% moderate to high-risk, increasing). Sensation-seeking, family, peer, and neighborhood factors at baseline predicted following the moderate-risk, increasing trajectory and the high-risk, increasing trajectory in males; these risk factors predicted following the moderate to high-risk, increasing trajectory in females. The presence of all three social risk factors (high-risk neighborhood, high-risk peers and low parental monitoring) had a dramatic <span class="hlt">impact</span> on increased probability of being in a high-risk trajectory group. These findings highlight the developmental significance of early personal and social risk factors on subsequent risk behaviors in early to middle adolescence. Future adolescent health behavior promotion interventions might consider offering additional prevention resources to pre- and early adolescent youth who are exposed to multiple contextual risk factors (even in the absence of risk behaviors) or youth who are early-starters of delinquency and substance use behaviors</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li class="active"><span>16</span></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_16 --> <div id="page_17" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li class="active"><span>17</span></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="321"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26920536','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26920536"><span id="translatedtitle">Postprandial kinetics of gene expression of proteins <span class="hlt">involved</span> in the digestive process in rainbow trout (O. mykiss) and <span class="hlt">impact</span> of diet composition.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Borey, Marion; Panserat, Stephane; Surget, Anne; Cluzeaud, Marianne; Plagnes-Juan, Elisabeth; Herman, Alexandre; Lazzarotto, Viviana; Corraze, Geneviève; Médale, Françoise; Lauga, Beatrice; Burel, Christine</p> <p>2016-08-01</p> <p>The <span class="hlt">impact</span> of increased incorporation of plant ingredients on diets for rainbow trout was evaluated in terms of gene expression of gastric (gastric lipase, pepsinogen) and intestinal (prolidase, maltase, phospholipase A2) digestive enzymes and nutrient transporters (peptide and glucose transporters), as well as of postprandial levels of plasma glucose, triglycerides and total free amino acids. For that purpose, trout alevins were fed from the start of exogenous feeding one of three different experimental diets: a diet rich in fish meal and fish oil (FM-FO), a plant-based diet (noFM-noFO) totally free from fish meal and fish oil, but containing plant ingredients and a Mixed diet (Mixed) intermediate between the FM-FO and noFM-noFO diets. After 16 months of rearing, all fish were left unfed for 72 h and then given a single meal to satiation. Blood, stomach and anterior intestine were sampled before the meal and at 2, 6 and 12 h after this meal. The postprandial kinetics of gene expression of gastric and intestinal digestive enzymes and nutrient transporters were then followed in trout fed the FM-FO diet. The postprandial profiles showed that the expression of almost all genes studied was stimulated by the presence of nutrients in the digestive tract of trout, but the timing (appearance of peaks) varied between genes. Based on these data, we have focused on the molecular response to dietary factors in the stomach and the intestine at 6 and 12 h after feeding, respectively. The reduction in FM and FO levels of dietary incorporation induced a significant decrease in the gene expression of gastric lipase, GLUT2 and PEPT1. The plasma glucose and triglycerides levels were also reduced in trout fed the noFM-noFO diet. Consequently, the present study suggests a decrease in digestive capacities in trout fed a diet rich in plant ingredients. PMID:26920536</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013EGUGA..1513748B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013EGUGA..1513748B"><span id="translatedtitle"><span class="hlt">Impact</span> of fracture stratigraphy on the paleohydrogeology of the Madison limestone in two basement <span class="hlt">involved</span> folds in the Bighorn Basin (Wyoming, USA)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Barbier, Mickael; Leprêtre, Rémi; Hamon, Youri; Callot, Jean-Paul; Gasparrini, Marta; Daniel, Jean-Marc; Lacombe, Olivier</p> <p>2013-04-01</p> <p>Based on the study of the Madison Limestone at Sheep Mountain and Rattlesnake Mountain, a unique outcrop dataset including (1) facies and diagenenitc analyses, (2) vertical persistence and cement stratigraphy of vein sets and (3) fluid inclusions thermometry are used to demonstrate (i) the importance of the eo-diagenetic phases on reservoirs petrophysical and mechanical properties, and (ii) the <span class="hlt">impact</span> of folding and fracturing on paleo-hydrogeology. The different phases of porosity and permeability development of the carbonates of the Madison Limestone occurred mainly during the syn-depositional eogenesis, the postponed eogenesis (reflux of brine during LFS3) and during the karstification at the end of the Mississippian. The early sealing by the Amsden Formation during the Early Pennsylvanian, limited the vertical exchanges and initiated the confinement of the Madison "aquifer". The burial of the Madison Limestone leaded to the occlusion of the pore network due to the calcite cementation in the distal parts of the platform whereas it leaded to the pore network development due to the crystallization of dolomite in proximal parts. Quantification of the vertical persistence of fractures shows that Sheep Mountain and Rattlesnake Mountain differ by the vertical persistence of the pre-folding Laramide vein sets, which are strictly bed-confined in Sheep Mountain but cut across bedding at Rattlesnake Mountain, whereas the syn-folding veins are through-going in both. The emplacement chronology and the various sources of the fluids responsible for the paragenetic sequence are based on isotope chemistry and fluid inclusions analysis of the matrix and vein cements. At Sheep Mountain and Rattlesnake Mountain, the two cements related to the burial are characterized by isotopic signatures of marine formation waters that were diluted during the karstification of the Madison Platform at the end of Mississippian. Meteoric fluids, presumably migrating during the Cenomanian from Wind</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4752468','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4752468"><span id="translatedtitle">HMGB1 Is <span class="hlt">Involved</span> in IFN-α Production and TRAIL Expression by HIV-1-Exposed Plasmacytoid Dendritic Cells: <span class="hlt">Impact</span> of the Crosstalk with NK Cells</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Formaglio, Pauline; Melki, Marie-Thérèse; Charbit, Bruno; Herbeuval, Jean-Philippe; Gougeon, Marie-Lise</p> <p>2016-01-01</p> <p>Plasmacytoid dendritic cells (pDCs) are innate sensors of viral infections and important mediators of antiviral innate immunity through their ability to produce large amounts of IFN-α. Moreover, Toll-like receptor 7 (TLR7) and 9 (TLR9) ligands, such as HIV and CpG respectively, turn pDCs into TRAIL-expressing killer pDCs able to lyse HIV-infected CD4+ T cells. NK cells can regulate antiviral immunity by modulating pDC functions, and pDC production of IFN-α as well as cell–cell contact is required to promote NK cell functions. Impaired pDC-NK cell crosstalk was reported in the setting of HIV-1 infection, but the <span class="hlt">impact</span> of HIV-1 on TRAIL expression and innate antiviral immunity during this crosstalk is unknown. Here, we report that low concentrations of CCR5-tropic HIV-1Ba-L promote the release of pro-inflammatory cytokines such as IFN-α, TNF-α, IFN-γ and IL-12, and CCR5-interacting chemokines (MIP-1α and MIP-1β) in NK-pDCs co-cultures. At high HIV-1BaL concentrations, the addition of NK cells did not promote the release of these mediators, suggesting that once efficiently triggered by the virus, pDCs could not integrate new activating signals delivered by NK cells. However, high HIV-1BaL concentrations were required to trigger IFN-α-mediated TRAIL expression at the surface of both pDCs and NK cells during their crosstalk. Interestingly, we identified the alarmin HMGB1, released at pDC-NK cell synapse, as an essential trigger for the secretion of IFN-α and IFN-related soluble mediators during the interplay of HIV-1 exposed pDCs with NK cells. Moreover, HMGB1 was found crucial for mTRAIL translocation to the plasma membrane of both pDCs and NK cells during their crosstalk following pDC exposure to HIV-1. Data from serum analyses of circulating HMGB1, HMGB1-specific antibodies, sTRAIL and IP-10 in a cohort of 67 HIV-1+ patients argue for the in vivo relevance of these observations. Altogether, these findings identify HMGB1 as a trigger for IFN</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1998PhDT.......212M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1998PhDT.......212M"><span id="translatedtitle">Fluid diffusion in <span class="hlt">porous</span> silica</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>McCann, Lowell I.</p> <p></p> <p>Fluid motion in <span class="hlt">porous</span> media has received a great deal of theoretical and experimental attention due to its importance in systems as diverse as ground water aquifers, catalytic processes, and size separation schemes. Often, the motion of interest is the random thermal motion of molecules in a fluid undergoing no net flow. This diffusive motion is particularly important when the size of the pores is nearly the same as the size of the molecules. In this study, fluid diffusion is measured in several varieties of <span class="hlt">porous</span> silica whose pore structure is determined by the process by which it is made. The samples in this study have porosities (φ, the ratio of the pore volume to the total sample volume) that vary from 0.3 to 0.75 and average pore radii that range from approximately 15 to 120 A. Determining the effect of the pore structure on the diffusion of a liquid in a <span class="hlt">porous</span> material is complicated by the chemical interactions between the diffusing molecules and the pore surface. In this study, ions in a hydrophilic fluid are used to block the adsorption of the diffusing dye molecules to the hydroxyl groups covering the silica surface. This technique is unlike typical surface treatments of silica in that it does not permanently alter the pore geometry. In this work, fluid diffusion is measured with a transient holographic grating technique where interfering laser beams create a periodic refractive index modulation in the fluid. The diffraction of a third laser off this grating is monitored to determine how quickly the grating relaxes, thereby determining the diffusion coefficient of the molecules in the fluid. Varying the grating periodicity controls the length scale of the diffusion measurement from 1.2 to 100 μm which is much larger than the average pore sizes of the samples. Therefore, over these large scales, we measure 'normal' diffusion, where the mean squared displacement of a diffusing particle varies linearly with time. In one particular type of <span class="hlt">porous</span> silica</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=PICA&pg=5&id=EJ418837','ERIC'); return false;" href="http://eric.ed.gov/?q=PICA&pg=5&id=EJ418837"><span id="translatedtitle">Parent <span class="hlt">Involvement</span>: What Is It That Works?</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Leik, Robert K.; Chalkley, Mary Anne</p> <p>1990-01-01</p> <p>Discusses the assessment of the <span class="hlt">impact</span> of parent <span class="hlt">involvement</span> in the Head Start Family <span class="hlt">Impact</span> Project. This project was undertaken with cooperation from the Parents in Community Action (PICA) component of the Hennepin County, Minnesota, Head Start Program. (BB)</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22318045','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22318045"><span id="translatedtitle">ZnO/<span class="hlt">porous</span>-Si and TiO{sub 2}/<span class="hlt">porous</span>-Si nanocomposite nanopillars</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Wang, Dong Yan, Yong; Schaaf, Peter; Sharp, Thomas; Schönherr, Sven; Ronning, Carsten; Ji, Ran</p> <p>2015-01-01</p> <p><span class="hlt">Porous</span> Si nanopillar arrays are used as templates for atomic layer deposition of ZnO and TiO{sub 2}, and thus, ZnO/<span class="hlt">porous</span>-Si and TiO{sub 2}/<span class="hlt">porous</span>-Si nanocomposite nanopillars are fabricated. The diffusion of the precursor molecules into the inside of the <span class="hlt">porous</span> structure occurs via Knudsen diffusion and is strongly limited by the small pore size. The luminescence of the ZnO/<span class="hlt">porous</span>-Si nanocomposite nanopillars is also investigated, and the optical emission can be changed and even quenched after a strong plasma treatment. Such nanocomposite nanopillars are interesting for photocatalysis and sensors.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3526399','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3526399"><span id="translatedtitle">Mechanical properties of sintered meso-<span class="hlt">porous</span> silicon: a numerical model</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p></p> <p>2012-01-01</p> <p>Because of its optical and electrical properties, large surfaces, and compatibility with standard silicon processes, <span class="hlt">porous</span> silicon is a very interesting material in photovoltaic and microelectromechanical systems technology. In some applications, <span class="hlt">porous</span> silicon is annealed at high temperature and, consequently, the cylindrical pores that are generated by anodization or stain etching reorganize into randomly distributed closed sphere-like pores. Although the design of devices which <span class="hlt">involve</span> this material needs an accurate evaluation of its mechanical properties, only few researchers have studied the mechanical properties of <span class="hlt">porous</span> silicon, and no data are nowadays available on the mechanical properties of sintered <span class="hlt">porous</span> silicon. In this work we propose a finite element model to estimate the mechanical properties of sintered meso-<span class="hlt">porous</span> silicon. The model has been employed to study the dependence of the Young’s modulus and the shear modulus (upper and lower bounds) on the porosity for porosities between 0% to 40%. Interpolation functions for the Young’s modulus and shear modulus have been obtained, and the results show good agreement with the data reported for other <span class="hlt">porous</span> media. A Monte Carlo simulation has also been employed to study the effect of the actual microstructure on the mechanical properties. PMID:23107474</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/7239172','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/7239172"><span id="translatedtitle">Simplified modeling of transition to detonation in <span class="hlt">porous</span> energetic materials</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Stewart, D.S. ); Asay, B.W. ); Prasad, K. )</p> <p>1994-07-01</p> <p>A simplified model that can predict the transitions from compaction to detonation and shock to detonation is given with the aim of describing experiments in beds of <span class="hlt">porous</span> HMX. In the case of compaction to detonation, the energy of early <span class="hlt">impact</span> generates a slowly moving, convective-reactive deflagration that expands near the piston face and evolves in a manner that is characteristic of confined deflagration to detonation transition. A single-phase state variable theory is adopted in contrast to a two-phase axiomatic mixture theory. The ability of the <span class="hlt">porous</span> material to compact is treated as an endothermic process. Reaction is treated as an exothermic process. The algebraic (Rankine--Hugoniot) steady wave analysis is given for inert compaction waves and steady detonation waves in a piston supported configuration, typical of the experiments carried out in <span class="hlt">porous</span> HMX. A structure analysis of the steady compaction wave is given. Numerical simulations of deflagration to detonation are carried out for parameters that describe an HMX-like material and compared with the experiments. The simple model predicts the high density plug that is observed in the experiments and suggests that the leading front of the plug is a secondary compaction wave. A shock to detonation transition is also numerically simulated.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4305408','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4305408"><span id="translatedtitle">Cytoskeleton remodelling of confluent epithelial cells cultured on <span class="hlt">porous</span> substrates</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Rother, Jan; Büchsenschütz-Göbeler, Matthias; Nöding, Helen; Steltenkamp, Siegfried; Samwer, Konrad; Janshoff, Andreas</p> <p>2015-01-01</p> <p>The <span class="hlt">impact</span> of substrate topography on the morphological and mechanical properties of confluent MDCK-II cells cultured on <span class="hlt">porous</span> substrates was scrutinized by means of various imaging techniques as well as atomic force microscopy comprising force volume and microrheology measurements. Regardless of the pore size, ranging from 450 to 5500 nm in diameter, cells were able to span the pores. They did not crawl into the holes or grow around the pores. Generally, we found that cells cultured on non-<span class="hlt">porous</span> surfaces are stiffer, i.e. cortical tension rises from 0.1 to 0.3 mN m−1, and less fluid than cells grown over pores. The mechanical data are corroborated by electron microscopy imaging showing more cytoskeletal filaments on flat samples in comparison to <span class="hlt">porous</span> ones. By contrast, cellular compliance increases with pore size and cells display a more fluid-like behaviour on larger pores. Interestingly, cells on pores larger than 3500 nm produce thick actin bundles that bridge the pores and thereby strengthen the contact zone of the cells. PMID:25566882</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/pages/biblio/1265277-thiazolothiazole-linked-porous-organic-polymers','SCIGOV-DOEP'); return false;" href="http://www.osti.gov/pages/biblio/1265277-thiazolothiazole-linked-porous-organic-polymers"><span id="translatedtitle">Thiazolothiazole-linked <span class="hlt">porous</span> organic polymers</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGESBeta</a></p> <p>Zhu, Xiang; Tian, Chengcheng; Jin, Tian; Wang, Jitong; Mahurin, Shannon Mark; Mei, Wenwen; Xiong, Yan; Hu, Jun; Feng, Xinliang; Liu, Honglai; et al</p> <p>2014-10-07</p> <p>In this study, thiazolothiazole-linked <span class="hlt">porous</span> organic polymers have been synthesized from a facile catalyst-free condensation reaction between aldehydes and dithiooxamide under solvothermal conditions. The resultant <span class="hlt">porous</span> frameworks exhibit a highly selective uptake of CO2 over N2 under ambient conditions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4316955','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4316955"><span id="translatedtitle">Biocompatibility and osteogenic properties of <span class="hlt">porous</span> tantalum</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>WANG, QIAN; ZHANG, HUI; LI, QIJIA; YE, LEI; GAN, HONGQUAN; LIU, YINGJIE; WANG, HUI; WANG, ZHIQIANG</p> <p>2015-01-01</p> <p><span class="hlt">Porous</span> tantalum has been reported to be a promising material for use in bone tissue engineering. In the present study, the biocompatibility and osteogenic properties of <span class="hlt">porous</span> tantalum were studied in vitro and in vivo. The morphology of <span class="hlt">porous</span> tantalum was observed using scanning electron microscopy (SEM). Osteoblasts were cultured with <span class="hlt">porous</span> tantalum, and cell morphology, adhesion and proliferation were investigated using optical microscopy and SEM. In addition, <span class="hlt">porous</span> tantalum rods were implanted in rabbits, and osteogenesis was observed using laser scanning confocal microscopy and hard tissue slice examination. The osteoblasts were observed to proliferate over time and adhere to the tantalum surface and pore walls, exhibiting a variety of shapes and intercellular connections. The <span class="hlt">porous</span> tantalum rod connected tightly with the host bone. At weeks 2 and 4 following implantation, new bone and small blood vessels were observed at the tantalum-host bone interface and pores. At week 10 after the <span class="hlt">porous</span> tantalum implantation, new bone tissue was observed at the tantalum-host bone interface and pores. By week 12, the tantalum-host bone interface and pores were covered with new bone tissue and the bone trabeculae had matured and connected directly with the materials. Therefore, the results of the present study indicate that <span class="hlt">porous</span> tantalum is non-toxic, biocompatible and a promising material for use in bone tissue engineering applications. PMID:25667628</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19680000331','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19680000331"><span id="translatedtitle">Electron beam selectively seals <span class="hlt">porous</span> metal filters</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Snyder, J. A.; Tulisiak, G.</p> <p>1968-01-01</p> <p>Electron beam welding selectively seals the outer surfaces of <span class="hlt">porous</span> metal filters and impedances used in fluid flow systems. The outer surface can be sealed by melting a thin outer layer of the <span class="hlt">porous</span> material with an electron beam so that the melted material fills all surface pores.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/752163','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/752163"><span id="translatedtitle">Tensile instabilities for <span class="hlt">porous</span> plasticity models</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>BRANNON,REBECCA M.</p> <p>2000-02-29</p> <p>Several concepts (and assumptions) from the literature for <span class="hlt">porous</span> metals and ceramics have been synthesized into a consistent model that predicts an admissibility limit on a material's <span class="hlt">porous</span> yield surface. To ensure positive plastic work, the rate at which a yield surface can collapse as pores grow in tension must be constrained.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1265277','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1265277"><span id="translatedtitle">Thiazolothiazole-linked <span class="hlt">porous</span> organic polymers</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Zhu, Xiang; Tian, Chengcheng; Jin, Tian; Wang, Jitong; Mahurin, Shannon Mark; Mei, Wenwen; Xiong, Yan; Hu, Jun; Feng, Xinliang; Liu, Honglai; Dai, Sheng</p> <p>2014-10-07</p> <p>In this study, thiazolothiazole-linked <span class="hlt">porous</span> organic polymers have been synthesized from a facile catalyst-free condensation reaction between aldehydes and dithiooxamide under solvothermal conditions. The resultant <span class="hlt">porous</span> frameworks exhibit a highly selective uptake of CO<sub>2</sub> over N<sub>2</sub> under ambient conditions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2015NatCo...6E6083J&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2015NatCo...6E6083J&link_type=ABSTRACT"><span id="translatedtitle">Aerosol generation by raindrop <span class="hlt">impact</span> on soil</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Joung, Young Soo; Buie, Cullen R.</p> <p>2015-01-01</p> <p>Aerosols are investigated because of their significant <span class="hlt">impact</span> on the environment and human health. To date, windblown dust and sea salt from sea spray through bursting bubbles have been considered the chief mechanisms of environmental aerosol dispersion. Here we investigate aerosol generation from droplets hitting wettable <span class="hlt">porous</span> surfaces including various classifications of soil. We demonstrate that droplets can release aerosols when they influence <span class="hlt">porous</span> surfaces, and these aerosols can deliver elements of the <span class="hlt">porous</span> medium to the environment. Experiments on various <span class="hlt">porous</span> media including soil and engineering materials reveal that knowledge of the surface properties and <span class="hlt">impact</span> conditions can be used to predict when frenzied aerosol generation will occur. This study highlights new phenomena associated with droplets on <span class="hlt">porous</span> media that could have implications for the investigation of aerosol generation in the environment.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/ED094863.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/ED094863.pdf"><span id="translatedtitle">Evaluating Parent <span class="hlt">Involvement</span>. Issue Paper No. 1.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Safran, Daniel</p> <p></p> <p>This paper poses a series of questions to assist programs in deciding what it is about parent <span class="hlt">involvement</span> that they wish to evaluate. The questions focus on the nature of parent <span class="hlt">involvement</span>, why parent <span class="hlt">involvement</span> is needed, and what evaluation of parent <span class="hlt">involvement</span> should include. A conceptual framework for research on the <span class="hlt">impact</span> of parent…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/23410370','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/23410370"><span id="translatedtitle">Hydrodynamic dispersion within <span class="hlt">porous</span> biofilms.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Davit, Y; Byrne, H; Osborne, J; Pitt-Francis, J; Gavaghan, D; Quintard, M</p> <p>2013-01-01</p> <p>Many microorganisms live within surface-associated consortia, termed biofilms, that can form intricate <span class="hlt">porous</span> structures interspersed with a network of fluid channels. In such systems, transport phenomena, including flow and advection, regulate various aspects of cell behavior by controlling nutrient supply, evacuation of waste products, and permeation of antimicrobial agents. This study presents multiscale analysis of solute transport in these <span class="hlt">porous</span> biofilms. We start our analysis with a channel-scale description of mass transport and use the method of volume averaging to derive a set of homogenized equations at the biofilm-scale in the case where the width of the channels is significantly smaller than the thickness of the biofilm. We show that solute transport may be described via two coupled partial differential equations or telegrapher's equations for the averaged concentrations. These models are particularly relevant for chemicals, such as some antimicrobial agents, that penetrate cell clusters very slowly. In most cases, especially for nutrients, solute penetration is faster, and transport can be described via an advection-dispersion equation. In this simpler case, the effective diffusion is characterized by a second-order tensor whose components depend on (1) the topology of the channels' network; (2) the solute's diffusion coefficients in the fluid and the cell clusters; (3) hydrodynamic dispersion effects; and (4) an additional dispersion term intrinsic to the two-phase configuration. Although solute transport in biofilms is commonly thought to be diffusion dominated, this analysis shows that hydrodynamic dispersion effects may significantly contribute to transport. PMID:23410370</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009EGUGA..11.5234B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009EGUGA..11.5234B"><span id="translatedtitle"><span class="hlt">Porous</span> Soil as Complex Network</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Benito, R. M.; Santiago, A.; Cárdenas, J. P.; Tarquis, A. M.; Borondo, F.; Losada, J. C.</p> <p>2009-04-01</p> <p>We present a complex network model based on a heterogeneous preferential attachment scheme [1,2] to quantify the structure of <span class="hlt">porous</span> soils [3]. Under this perspective pores are represented by nodes and the space for the flow of fluids between them are represented by links. Pore properties such as position and size are described by fixed states in a metric space, while an affinity function is introduced to bias the attachment probabilities of links according to these properties. We perform an analytical and numerical study of the degree distributions in the soil model and show that under reasonable conditions all the model variants yield a multiscaling behavior in the connectivity degrees, leaving a empirically testable signature of heterogeneity in the topology of pore networks. References [1] A. Santiago and R. M. Benito, "Emergence of multiscaling in heterogeneous complex networks". Int. J. Mod. Phys. C 18, 1591 (2007). [2] A. Santiago and R. M. Benito, "An extended formalism for preferential attachment in heterogeneous complex networks". Europhys. Lett. 82, 58004 (2008). [3] A. Santiago, R. M. Benito, J. P. Cárdenas, J. C. Losada, A. M. Tarquis and F. Borondo, "Multiscaling of <span class="hlt">porous</span> soils as heterogeneous complex networks". Nonl. Proc. Geophys. 15, 1-10 (2008).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1021902','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1021902"><span id="translatedtitle">Microelectromechanical pump utilizing <span class="hlt">porous</span> silicon</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Lantz, Jeffrey W.; Stalford, Harold L.</p> <p>2011-07-19</p> <p>A microelectromechanical (MEM) pump is disclosed which includes a <span class="hlt">porous</span> silicon region sandwiched between an inlet chamber and an outlet chamber. The <span class="hlt">porous</span> silicon region is formed in a silicon substrate and contains a number of pores extending between the inlet and outlet chambers, with each pore having a cross-section dimension about equal to or smaller than a mean free path of a gas being pumped. A thermal gradient is provided along the length of each pore by a heat source which can be an electrical resistance heater or an integrated circuit (IC). A channel can be formed through the silicon substrate so that inlet and outlet ports can be formed on the same side of the substrate, or so that multiple MEM pumps can be connected in series to form a multi-stage MEM pump. The MEM pump has applications for use in gas-phase MEM chemical analysis systems, and can also be used for passive cooling of ICs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/786558','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/786558"><span id="translatedtitle">Upscaling of Constitutive Relations I Unsaturated Heterogeneous <span class="hlt">Porous</span> Media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>H. H. Liu; G. S. Bodvarsson</p> <p>2001-05-31</p> <p>When numerical model are used for modeling field scale flow and transport processes in the subsurface, the problem of ''upscaling'' arises. Typical scales, corresponding to spatial resolutions of subsurface heterogeneity in numerical models, are generally much larger than the measurement scale of the parameters and physical processes <span class="hlt">involved</span>. The upscaling problems is, then, one of assigning parameters to gridblock scale based on parameter values measured on small scales. The focus of this study is to develop an approach to determine large-scale (upscaled) constitutive relations (relationships among relative permeability, capillary pressure and saturation) from small-scale measurements for <span class="hlt">porous</span> media for a range of air entry values that are typical for the tuff matrix in the unsaturated zone of Yucca Mountain. For <span class="hlt">porous</span> media with large air entry values, capillary forces play a key role in determining spatial water distribution at large-scales. Therefore, a relatively uniform capillary pressure approximately exists even for a large gridblock scale under steady state flow conditions. Based on these reasoning, we developed formulations that relate upscaled constitutive relations to ones measured at core-scale. Numerical experiments with stochastically generated heterogeneous <span class="hlt">porous</span> media were used to evaluate the upscaling formulations.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li class="active"><span>17</span></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_17 --> <div id="page_18" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li class="active"><span>18</span></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="341"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26422294','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26422294"><span id="translatedtitle">Development Trends in <span class="hlt">Porous</span> Adsorbents for Carbon Capture.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Sreenivasulu, Bolisetty; Sreedhar, Inkollu; Suresh, Pathi; Raghavan, Kondapuram Vijaya</p> <p>2015-11-01</p> <p>Accumulation of greenhouse gases especially CO2 in the atmosphere leading to global warming with undesirable climate changes has been a serious global concern. Major power generation in the world is from coal based power plants. Carbon capture through pre- and post- combustion technologies with various technical options like adsorption, absorption, membrane separations, and chemical looping combustion with and without oxygen uncoupling have received considerable attention of researchers, environmentalists and the stake holders. Carbon capture from flue gases can be achieved with micro and meso <span class="hlt">porous</span> adsorbents. This review covers carbonaceous (organic and metal organic frameworks) and noncarbonaceous (inorganic) <span class="hlt">porous</span> adsorbents for CO2 adsorption at different process conditions and pore sizes. Focus is also given to noncarbonaceous micro and meso <span class="hlt">porous</span> adsorbents in chemical looping combustion <span class="hlt">involving</span> insitu CO2 capture at high temperature (>400 °C). Adsorption mechanisms, material characteristics, and synthesis methods are discussed. Attention is given to isosteric heats and characterization techniques. The options to enhance the techno-economic viability of carbon capture techniques by integrating with CO2 utilization to produce industrially important chemicals like ammonia and urea are analyzed. From the reader's perspective, for different classes of materials, each section has been summarized in the form of tables or figures to get a quick glance of the developments. PMID:26422294</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016E%26ES...36a2021B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016E%26ES...36a2021B"><span id="translatedtitle">Adsorption isotherm of non-azeotropic solution onto <span class="hlt">porous</span> adsorbents</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bono, A.; Ramlan, N. A.; Anisuzzaman, S. M.; Chu, C. M.; Farm, Y. Y.</p> <p>2016-06-01</p> <p>Adsorption isotherm is essential component in the understanding of the adsorption process. Several methods of the measurements, analysis and interpretation of adsorption from solution have been reported in the literature. Most of the measurements of adsorption isotherm from solution were <span class="hlt">involved</span> the measurement of excess isotherm conducted at low region of sorbates concentration. Direct interpretation of excess adsorption isotherm as adsorption isotherm is always been practice. Therefore, in this work a study on the measurement of the adsorption isotherm from solution of non-azeotropic organic solvent mixture onto <span class="hlt">porous</span> adsorbents for whole range of liquid concentration was conducted. The study included the measurement of excess adsorption isotherm using conventional technique. Theoretical analysis and interpretation of adsorption isotherm from the excess isotherm were conducted using Pseudo Ideal Adsorption, Gibbs Dividing Plane Model and Langmuir-Fruendlich binary isotherm model. For organic solvents, acetone and propanol were chosen as the adsorbates due to the non-azeotropic properties in the mixture. Activated carbon and silicalite were chosen as adsorbents due to the different in their porosity such as macro <span class="hlt">porous</span> and micro <span class="hlt">porous</span> structure. The result of the study has revealed that the adsorption isotherm of non-azeotropic mixture onto activated carbon and silicalite can be interpreted as monolayer type of adsorption.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/24407681','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/24407681"><span id="translatedtitle">Microscale simulation of particle deposition in <span class="hlt">porous</span> media.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Boccardo, Gianluca; Marchisio, Daniele L; Sethi, Rajandrea</p> <p>2014-03-01</p> <p>In this work several geometries, each representing a different <span class="hlt">porous</span> medium, are considered to perform detailed computational fluid dynamics simulation for fluid flow, particle transport and deposition. Only Brownian motions and steric interception are accounted for as deposition mechanisms. Firstly pressure drop in each <span class="hlt">porous</span> medium is analyzed in order to determine an effective grain size, by fitting the results with the Ergun law. Then grid independence is assessed. Lastly, particle transport in the system is investigated via Eulerian steady-state simulations, where particle concentration is solved for, not following explicitly particles' trajectories, but solving the corresponding advection-diffusion equation. An assumption was made in considering favorable collector-particle interactions, resulting in a "perfect sink" boundary condition for the collectors. The gathered simulation data are used to calculate the deposition efficiency due to Brownian motions and steric interception. The original Levich law for one simple circular collector is verified; subsequently <span class="hlt">porous</span> media constituted by a packing of collectors are scrutinized. Results show that the interactions between the different collectors result in behaviors which are not in line with the theory developed by Happel and co-workers, highlighting a different dependency of the deposition efficiency on the dimensionless groups <span class="hlt">involved</span> in the relevant correlations. PMID:24407681</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/22939219','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/22939219"><span id="translatedtitle">Ceramic modifications of <span class="hlt">porous</span> titanium: effects on macrophage activation.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Scislowska-Czarnecka, A; Menaszek, E; Szaraniec, B; Kolaczkowska, E</p> <p>2012-12-01</p> <p><span class="hlt">Porous</span> titanium is one of the most widely used implant materials because of its mechanical properties, however, it is also characterised by low bioactivity. To improve the above parameter we prepared three modifications of the <span class="hlt">porous</span> (30 wt%) titanium (Ti) surface by covering it with bioactive hydroxyapatite (HA), bioglass (BG) and calcium silicate (CS). Subsequently we tested the <span class="hlt">impact</span> of the modifications on macrophages directing the inflammatory response that might compromise the implant bioactivity. In the study we investigated the in vitro effects of the materials on murine cell line RAW 264.7 macrophage adherence, morphology and activation (production/release of metalloproteinase MMP-9 and pro- and anti-inflammatory cytokines). CS Ti decreased the macrophage adherence and up-regulated the release of several pro-inflammatory mediators, including TNF-α, IL-6, IL-12. Also HA Ti reduced the cell adherence but other parameters were generally not increased, except of TNF-α. In contrast, BG Ti improved macrophage adherence and either decreased production of multiple mediators (MMP-9, TNF-α, IFN-γ, MCP-1) or did not change it in comparison to the <span class="hlt">porous</span> titanium. We can conclude that analyzing the effects on the inflammatory response initiated by macrophages in vitro, calcium silicate did not improve the biological properties of the <span class="hlt">porous</span> titanium. The improved bioactivity of titanium was, however, achieved by the application of the hydroxyapatite and bioglass layers. The present in vitro results suggest that these materials, HA Ti and especially BG Ti, may be suitable for in vivo application and thus justify their further investigation. PMID:22939219</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016EGUGA..18.3949B&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016EGUGA..18.3949B&link_type=ABSTRACT"><span id="translatedtitle">Effect of sequential release of NAPLs on NAPL migration in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bang, Woohui; Yeo, In Wook</p> <p>2016-04-01</p> <p>NAPLs (Non-aqueous phase liquids) are common groundwater contaminants and are classified as LNAPLs (Light non-aqueous phase liquids) and DNAPLs (Dense non-aqueous phase liquids) according to relative density for water. Due to their low solubility in water, NAPLs remain for a long time in groundwater, and they pose a serious environmental problem. Therefore, understanding NAPLs migration in <span class="hlt">porous</span> media is essential for effective NAPLs remediation. DNAPLs tend to move downward through the water table by gravity force because its density is higher than water. However, if DNAPLs do not have sufficient energy which breaks capillary force of <span class="hlt">porous</span> media, they will just accumulate above capillary zone or water table. Mobile phase of LNAPLs rises and falls depending on fluctuation of water table, and it could change the wettability of <span class="hlt">porous</span> media from hydrophilic to hydrophobic. This could <span class="hlt">impacts</span> on the migration characteristics of subsequently-released DNAPLs. LNAPLs and DNAPLs are sometime disposed at the same place (for example, the Hill air force base, USA). Therefore, this study focuses on the effect of sequential release of NAPLs on NAPLs (in particular, DNAPL) migration in <span class="hlt">porous</span> media. We have conducted laboratory experiments. Gasoline, which is known to change wettability of <span class="hlt">porous</span> media from hydrophilic to intermediate, and TCE (Trichloroethylene) were used as LNAPL and DNAPL, respectively. Glass beads with the grain size of 1 mm and 2 mm were prepared for two sets of <span class="hlt">porous</span> media. Gasoline and TCE was dyed for visualization. First, respective LNAPL and DNAPL of 10 ml were separately released into prepared <span class="hlt">porous</span> media. For the grain size of 2 mm glass beads, LNAPL became buoyant above the water table, and DNAPL just moved downward through <span class="hlt">porous</span> media. However, for the experiment with the grain size of 1 mm glass beads, NAPLs behaved very differently. DNAPL did not migrate downward below and just remained above the water table due to capillary pressure of</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014APS..DFDM15007J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014APS..DFDM15007J"><span id="translatedtitle">Drop Impingement Induced Dispersal of Microorganisms and Contaminants Within <span class="hlt">Porous</span> Media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Joung, Young Soo; Ge, Zhifei; Buie, Cullen</p> <p>2014-11-01</p> <p>We investigate migration of chemicals and microbes with aerosol generated by drop impingement on <span class="hlt">porous</span> media. In our previous work we found that aerosol generation from droplets hitting <span class="hlt">porous</span> media within a specific range of the Weber number (We) and a modified Pelect number (Pe). We and Pe reflect the <span class="hlt">impact</span> condition of droplets and the wetting properties of <span class="hlt">porous</span> media, respectively. The relationship between We and Pe can be expressed by a third dimensionless group, the Washburn Reynolds number (ReW = We/Pe). In a specific range of ReW, hundreds of aerosol particles can be generated within milliseconds of drop impingement. In this work we investigate if microbes such as Corynebacterium glutamicum, a soil bacterium, and chemicals such as Rhodamine B can be dispersed by aerosols generated from droplet <span class="hlt">impact</span>. Experimentally, C. glutamicum and Rhodamine B are permeated into <span class="hlt">porous</span> media. Then drop impingements are conducted on the <span class="hlt">porous</span> media with different We and Pe in an airflow tunnel. We quantitatively investigate the volume and speed of aerosol migration as a function of ReW of the drop impingement and Re of the airflow. Results of this study will shed light upon the dispersal of elemental compounds and microbes within soils due to aerosol generated by rainfall.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1005634','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/1005634"><span id="translatedtitle">Measurement and Estimation of Organic-Liquid/Water Interfacial Areas for Several Natural <span class="hlt">Porous</span> Media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Brusseau, M.L.; Narter, M.; Schnaar, G.; Marble, J.</p> <p>2009-06-01</p> <p>The objective of this study was to quantitatively characterize the <span class="hlt">impact</span> of <span class="hlt">porous</span>-medium texture on interfacial area between immiscible organic liquid and water residing within natural <span class="hlt">porous</span> media. Synchrotron X-ray microtomography was used to obtain high-resolution, three-dimensional images of solid and liquid phases in packed columns. The image data were processed to generate quantitative measurements of organic-liquid/water interfacial area and of organic-liquid blob sizes. Ten <span class="hlt">porous</span> media, comprising a range of median grain sizes, grain-size distributions, and geochemical properties, were used to evaluate the <span class="hlt">impact</span> of <span class="hlt">porous</span>-medium texture on interfacial area. The results show that fluid-normalized specific interfacial area (A{sub f}) and maximum specific interfacial area (A{sub m}) correlate very well to inverse median grain diameter. These functionalities were shown to result from a linear relationship between effective organic-liquid blob diameter and median grain diameter. These results provide the basis for a simple method for estimating specific organic-liquid/water interfacial area as a function of fluid saturation for a given <span class="hlt">porous</span> medium. The availability of a method for which the only parameter needed is the simple-to-measure median grain diameter should be of great utility for a variety of applications.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2002DPS....34.2702K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2002DPS....34.2702K"><span id="translatedtitle">Energy dissipation during sublimation from <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Keller, H. U.; Skorov, Yu. V.</p> <p>2002-09-01</p> <p>Several physical processes during the sublimation from and inside <span class="hlt">porous</span> media have been investigated in detail in a series our papers (Skorov et al., 1999, Icarus 140, 173, Skorov et al., 2001, Icarus 153, 180, Davidsson and Skorov, 2002, Icarus 156, 223, Davidsson and Skorov, 2002, Icarus, in press) in order to analyse the gas production of cometary nuclei . New features are the absorption of the irradiation within the uppermost layers of the pores (rather than on the surface), taking into account the gas pressure of the coma, and temperature dependent condensation and sublimation coefficients. Detailed kinetic calculations revealed deviations from the canonical gasdynamic models. We will summarize the <span class="hlt">impact</span> of these new calculations on the physics of sublimation from a cometary nucleus. The absorption of the irradiation below the surface leads to a decrease of sublimation flux near the subsolar point but to an increase near the evening terminator and nightside of a rotating nucleus. More absorbed energy is available to be transferred into the interior of the nucleus. This effect and consequences for the development of cometary nuclei will be discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/11161513','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/11161513"><span id="translatedtitle">Unsteady-State Flow of Flexible Polymers in <span class="hlt">Porous</span> Media.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Zitha, Pacelli L. J.; Chauveteau, Guy; Léger, Liliane</p> <p>2001-02-15</p> <p>In this paper we report an investigation of the unsteady-state flow of polymer solutions through granular <span class="hlt">porous</span> media. The experiments were performed using high-molecular-weight nonionic and anionic polyacrylamides dissolved in water containing NaCl and model <span class="hlt">porous</span> media obtained by packing silicon carbide (SiC) grains having a narrow grain size distribution. Before injection in <span class="hlt">porous</span> media, the polymer solutions were carefully filtered according to a method that was proved to be efficient in removing any possibly remaining microgels. The SiC grain surface was passively oxidized by a controlled thermal treatment in order to obtain a surface partially covered by a thin silica layer having adsorption properties similar to those of quartzitic sand. By packing SiC grains of different sizes, <span class="hlt">porous</span> media having identical adsorption properties and well-known pore throats sizes can be obtained with a good reproducibility. Parameters investigated include pore size, velocity gradient, polymer concentration, and adsorption energy. A striking unsteady-state flow behavior (pressure build-up at constant flow rate) is observed when three conditions are fulfilled: (a) the velocity gradient is larger than that known to be able to induce a coil-stretch transition, (b) the polymer adsorbs on the pore surfaces, and (c) the length of stretched macromolecules is larger than the effective pore throat diameter. When one of these conditions is not satisfied the flow remains steady. These observations are interpreted by a mechanism <span class="hlt">involving</span> the adsorption and bridging across pore restrictions of elongated chains. We propose to refer to this peculiar mode of polymer adsorption as bridging adsorption. Copyright 2001 Academic Press. PMID:11161513</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20090024823&hterms=Ballistics&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3DBallistics','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20090024823&hterms=Ballistics&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3DBallistics"><span id="translatedtitle">Ballistic Performance of <span class="hlt">Porous</span>-Ceramic, Thermal-Protection-Systems</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Christiansen, E. L.; Davis, B. A.; Miller, J. E.; Bohl, W. E.; Foreman, C. D.</p> <p>2009-01-01</p> <p><span class="hlt">Porous</span>-ceramic, thermal protection systems are used heavily in current reentry vehicles like the Space Shuttle and are currently being proposed for the next generation of manned spacecraft, Orion. These materials insulate the structural components of a spacecraft against the intense thermal environments of atmospheric reentry. Furthermore, these materials are also highly exposed to space environmental hazards like meteoroid and orbital debris <span class="hlt">impacts</span>. This paper discusses recent <span class="hlt">impact</span> testing up to 9 km/s, and the findings of the influence of material equation-of-state on the simulation of the <span class="hlt">impact</span> event to characterize the ballistic performance of these materials. These results will be compared with heritage models1 for these materials developed from testing at lower velocities. Assessments of predicted spacecraft risk based upon these tests and simulations will also be discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/27524071','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27524071"><span id="translatedtitle">Engineered <span class="hlt">porous</span> scaffolds for periprosthetic infection prevention.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Iviglia, Giorgio; Cassinelli, Clara; Bollati, Daniele; Baino, Francesco; Torre, Elisa; Morra, Marco; Vitale-Brovarone, Chiara</p> <p>2016-11-01</p> <p>Periprosthetic infection is a consequence of implant insertion procedures and strategies for its prevention <span class="hlt">involve</span> either an increase in the rate of new bone formation or the release of antibiotics such as vancomycin. In this work we combined both strategies and developed a novel, multifunctional three-dimensional <span class="hlt">porous</span> scaffold that was produced using hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP), coupled with a pectin (PEC)-chitosan (CHIT) polyelectrolyte (PEI), and loaded with vancomycin (VCA). By this approach, a controlled vancomycin release was achieved and serial bacterial dilution test demonstrated that, after 1week, the engineered construct still inhibits the bacterial growth. Degradation tests show an excellent behavior in a physiological and acidic environment (<10% of mass loss). Furthermore, the PEI coating shows an anti-inflammatory response, and good cell proliferation and migration were demonstrated in vitro using osteoblast SAOS-2 cell line. This new engineered construct exhibits excellent properties both as an antibacterial material and as a stimulator of bone formation, which makes it a good candidate to contrast periprosthetic infection. PMID:27524071</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3627417','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3627417"><span id="translatedtitle">BLOOD TRIGGERED RAPID RELEASE <span class="hlt">POROUS</span> NANOCAPSULES</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Gustafson, Tiffany P.; Dergunov, Sergey A.; Akers, Walter J.; Cao, Qian; Magalotti, Selena; Achilefu, Samuel; Pinkhassik, Eugene; Berezin, Mikhail Y.</p> <p>2013-01-01</p> <p>Rapid-release drug delivery systems present a new paradigm in emergency care treatments. Such systems combine a long shelf life with the ability to provide a significant dose of the drug to the bloodstream in the shortest period of time. Until now, development of delivery formulations has concentrated on slow release systems to ensure a steady concentration of the drug. To address the need for quick release system, we created hollow polyacrylate nanocapsules with nanometer-thin <span class="hlt">porous</span> walls. Burst release occurs upon interaction with blood components that leads to escape of the cargo. The likely mechanism of release <span class="hlt">involves</span> a conformational change of the polymer shell caused by binding albumin. To demonstrate this concept, a near-infrared fluorescent dye indocyanine green (ICG) was incorporated inside the nanocapsules. ICG-loaded nanocapsules demonstrated remarkable shelf life in aqueous buffers with no release of ICG for twelve months. Rapid release of the dye was demonstrated first in vitro using albumin solution and serum. SEM and light scattering analysis demonstrated the retention of the nanocapsule architecture after the release of the dye upon contact with albumin. In vivo studies using fluorescence lifetime imaging confirmed quick discharge of ICG from the nanocapsules following intravenous injection. PMID:23606942</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/770682','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/770682"><span id="translatedtitle">Dynamic magnetic compaction of <span class="hlt">porous</span> materials</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p></p> <p>1998-10-29</p> <p>IAP Research began development of the Dynamic Magnetic Compaction (DMC) process three years before the CRADA was established. IAP Research had experimentally demonstrated the feasibility of the process, and conducted a basic market survey. IAP identified and opened discussions with industrial partners and established the basic commercial cost structure. The purpose of this CRADA project was to predict and verify optimum pressure vs. time history for the compaction of <span class="hlt">porous</span> copper and tungsten. LLNL modeled the rapid compaction of powdered material from an initial density of about 30% theoretical maximum to more than 90% theoretical maximum. The compaction simulations were benchmarked against existing data and new data was acquired by IAP Research. The modeling was used to perform parameter studies on the pressure loading time history, initial porosity and temperature. LLNL ran simulations using codes CALE or NITO and compared the simulations with published compaction data and equation of state (EOS) data. This project did not <span class="hlt">involve</span> the development or modification of software code. CALE and NITO were existing software programs at LLNL. No modification of these programs occurred within the scope of the CRADA effort.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/948405','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/948405"><span id="translatedtitle">Evaluation of Sampling Tools for Environmental Sampling of Bacterial Endospores from <span class="hlt">Porous</span> and Non-<span class="hlt">porous</span> Surfaces</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Valentine, Nancy B.; Butcher, Mark G.; Su, Yin-Fong; Jarman, Kristin H.; Matzke, Melissa M.; Webb-Robertson, Bobbie-Jo M.; Panisko, Ellen A.; Seiders, Barbara AB; Wahl, Karen L.</p> <p>2008-03-08</p> <p>Aims: Having and executing a well-defined and validated sampling protocol is critical following a purposeful release of a biological agent for response and recovery activities, for clinical and epidemiological analysis and for forensic purposes. The objective of this study was to address the need for validated sampling and analysis methods called out by the General Accounting Office and others to systematically compare the collection efficiency of various swabs and wipes for collection of bacterial endospores from five different surfaces, both <span class="hlt">porous</span> and non-<span class="hlt">porous</span>. This study was also designed to test the collection and extraction solutions used for endospore recovery from swabs and wipes. Methods and Results: Eight collection tools were used, five swabs and three wipes. Three collection/preservation solutions were evaluated: sterile E-pure® water, phosphate buffered saline (PBS), and phosphate buffered saline with 0.3% Tween (PBST). An Ink Jet Aerosol Generator (IJAG) was used to apply Bacillus subtilis endospores to five <span class="hlt">porous</span> and non-<span class="hlt">porous</span> surfaces. The collection efficiencies of the swabs and wipes were compared using a statistical multiple comparison analysis. Results indicated that wipes tend to have higher collection efficiency than swabs. Of the swabs tested, the recovery from most of the surfaces was highest with the polyurethane foam swab. Conclusions: The ScottPure® wipe had the highest collection efficiency and PBST was the best collection solution of those tested. Significance and <span class="hlt">Impact</span> of Study: Validated sampling for potential biological warfare is of significant importance and this study answered some relevant questions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016ZaMP...67...63S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016ZaMP...67...63S"><span id="translatedtitle">On <span class="hlt">porous</span>-elastic system with localized damping</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Santos, M. L.; Almeida Júnior, D. S.</p> <p>2016-06-01</p> <p>In this article, we are considering the one-dimensional equations of an homogeneous and isotropic <span class="hlt">porous</span> elastic solid, where the localized damping <span class="hlt">involves</span> the sum of displacement velocity of a solid elastic material and the volume fraction velocity. First we show, using a result due to Benchimol (SIAM J Control Optim 16:373-379, 1978), that the semigroup associated with the system is strongly stable if and only if the boundary of the support of feedback control intersects that of the interval under consideration. Then we use the frequency domain method combined with careful inequalities obtained using multiplicative techniques to prove that the semigroup under consideration is exponentially stable.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/866190','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/866190"><span id="translatedtitle">Method of preparing thin <span class="hlt">porous</span> sheets of ceramic material</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Swarr, Thomas E.; Nickols, Richard C.; Krasij, Myron</p> <p>1987-03-24</p> <p>A method of forming thin <span class="hlt">porous</span> sheets of ceramic material for use as electrodes or other components in a molten carbonate fuel cell is disclosed. The method <span class="hlt">involves</span> spray drying a slurry of fine ceramic particles in liquid carrier to produce generally spherical agglomerates of high porosity and a rough surface texture. The ceramic particles may include the electrode catalyst and the agglomerates can be calcined to improve mechanical strength. After slurrying with suitable volatile material and binder tape casting is used to form sheets that are sufficiently strong for further processing and handling in the assembly of a high temperature fuel cell.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6256776','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/biblio/6256776"><span id="translatedtitle">Method of preparing thin <span class="hlt">porous</span> sheets of ceramic material</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Swarr, T.E.; Nickols, R.C.; Krasij, M.</p> <p>1984-05-23</p> <p>A method of forming thin <span class="hlt">porous</span> sheets of ceramic material for use as electrodes or other components in a molten carbonate fuel cell is disclosed. The method <span class="hlt">involves</span> spray drying a slurry of fine ceramic particles in liquid carrier to produce generally spherical agglomerates of high porosity and a rough surface texture. The ceramic particles may include the electrode catalyst and the agglomerates can be calcined to improve mechanical strength. After slurrying with suitable volatile material and binder tape casting is used to form sheets that are sufficiently strong for further processing and handling in the assembly of a high temperature fuel cell.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26583741','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26583741"><span id="translatedtitle">Evaluation of a numerical simulation model for a system coupling atmospheric gas, surface water and unsaturated or saturated <span class="hlt">porous</span> medium.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Hibi, Yoshihiko; Tomigashi, Akira; Hirose, Masafumi</p> <p>2015-12-01</p> <p>Numerical simulations that couple flow in a surface fluid with that in a <span class="hlt">porous</span> medium are useful for examining problems of pollution that <span class="hlt">involve</span> interactions among the atmosphere, surface water and groundwater, including, for example, saltwater intrusion along coasts. We previously developed a numerical simulation method for simulating a coupled atmospheric gas, surface water, and groundwater system (called the ASG method) that employs a saturation equation for flow in a <span class="hlt">porous</span> medium; this equation allows both the void fraction of water in the surface system and water saturation in the <span class="hlt">porous</span> medium to be solved simultaneously. It remained necessary, however, to evaluate how global pressure, including gas pressure, water pressure, and capillary pressure, should be specified at the boundary between the surface and the <span class="hlt">porous</span> medium. Therefore, in this study, we derived a new equation for global pressure and integrated it into the ASG method. We then simulated water saturation in a <span class="hlt">porous</span> medium and the void fraction of water in a surface system by the ASG method and reproduced fairly well the results of two column experiments. Next, we simulated water saturation in a <span class="hlt">porous</span> medium (sand) with a bank, by using both the ASG method and a modified Picard (MP) method. We found only a slight difference in water saturation between the ASG and MP simulations. This result confirmed that the derived equation for global pressure was valid for a <span class="hlt">porous</span> medium, and that the global pressure value could thus be used with the saturation equation for <span class="hlt">porous</span> media. Finally, we used the ASG method to simulate a system coupling atmosphere, surface water, and a <span class="hlt">porous</span> medium (110m wide and 50m high) with a trapezoidal bank. The ASG method was able to simulate the complex flow of fluids in this system and the interaction between the <span class="hlt">porous</span> medium and the surface water or the atmosphere. PMID:26583741</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JCHyd.183..121H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JCHyd.183..121H"><span id="translatedtitle">Evaluation of a numerical simulation model for a system coupling atmospheric gas, surface water and unsaturated or saturated <span class="hlt">porous</span> medium</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hibi, Yoshihiko; Tomigashi, Akira; Hirose, Masafumi</p> <p>2015-12-01</p> <p>Numerical simulations that couple flow in a surface fluid with that in a <span class="hlt">porous</span> medium are useful for examining problems of pollution that <span class="hlt">involve</span> interactions among the atmosphere, surface water and groundwater, including, for example, saltwater intrusion along coasts. We previously developed a numerical simulation method for simulating a coupled atmospheric gas, surface water, and groundwater system (called the ASG method) that employs a saturation equation for flow in a <span class="hlt">porous</span> medium; this equation allows both the void fraction of water in the surface system and water saturation in the <span class="hlt">porous</span> medium to be solved simultaneously. It remained necessary, however, to evaluate how global pressure, including gas pressure, water pressure, and capillary pressure, should be specified at the boundary between the surface and the <span class="hlt">porous</span> medium. Therefore, in this study, we derived a new equation for global pressure and integrated it into the ASG method. We then simulated water saturation in a <span class="hlt">porous</span> medium and the void fraction of water in a surface system by the ASG method and reproduced fairly well the results of two column experiments. Next, we simulated water saturation in a <span class="hlt">porous</span> medium (sand) with a bank, by using both the ASG method and a modified Picard (MP) method. We found only a slight difference in water saturation between the ASG and MP simulations. This result confirmed that the derived equation for global pressure was valid for a <span class="hlt">porous</span> medium, and that the global pressure value could thus be used with the saturation equation for <span class="hlt">porous</span> media. Finally, we used the ASG method to simulate a system coupling atmosphere, surface water, and a <span class="hlt">porous</span> medium (110 m wide and 50 m high) with a trapezoidal bank. The ASG method was able to simulate the complex flow of fluids in this system and the interaction between the <span class="hlt">porous</span> medium and the surface water or the atmosphere.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012AGUFM.H51H1446S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012AGUFM.H51H1446S"><span id="translatedtitle">Quantitative Permeability Prediction for Anisotropic <span class="hlt">Porous</span> Media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sheng, Q.; Thompson, K. E.</p> <p>2012-12-01</p> <p>Pore-scale modeling as a predictive tool has become an integral to both research and commercial simulation in recent years. Permeability is one of the most important of the many properties that can be simulated. Traditionally, permeability is determined using Darcy's law, based on the assumption that the pressure gradient is aligned with the principal flow direction. However, a wide variety of <span class="hlt">porous</span> media exhibit anisotropic permeability due to particle orientation or laminated structure. In these types of materials, the direction of fluid flow is not aligned with the pressure gradient (except along the principal directions). Thus, it is desirable to predict the full permeability tensor for anisotropic materials using a first-principles pore-scale approach. In this work, we present a fast method to determine the full permeability tensor and the principal directions using a novel network modeling algorithm. We also test the ability of network modeling (which is an approximate method) to detect anisotropy in various structures. Both computational fluid dynamics (CFD) methods and network modeling have emerged as effective techniques to predict rock properties. CFD models are more rigorous but computationally expensive. Network modeling <span class="hlt">involves</span> significant approximations but can be orders-of-magnitude more efficient computationally, which is important for both speed and the ability to model larger scales. This work uses network modeling, with simulations performed on two types of anisotropic materials: laminated packings (with layers of different sized particles) and oriented packings (containing particles with preferential orientation). Pore network models are created from the <span class="hlt">porous</span> media data, and a novel method is used to determine the permeability tensor and principal flow direction using pore network modeling. The method is verified by comparing the calculated principal directions with the known anisotropy and also by comparing permeability with values from CFD</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li class="active"><span>18</span></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_18 --> <div id="page_19" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li class="active"><span>19</span></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="361"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2002IJNAM..26..683P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2002IJNAM..26..683P"><span id="translatedtitle">Solute transport through a deforming <span class="hlt">porous</span> medium</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Peters, Glen P.; Smith, David W.</p> <p>2002-06-01</p> <p>Solute transport through a <span class="hlt">porous</span> medium is typically modelled assuming the <span class="hlt">porous</span> medium is rigid. However, many applications exist where the <span class="hlt">porous</span> medium is deforming, including, municipal landfill liners, mine tailings dams, and land subsidence. In this paper, mass balance laws are used to derive the flow and transport equations for a deforming <span class="hlt">porous</span> medium. The equations are derived in both spatial and material co-ordinate systems. Solute transport through an engineered landfill liner is used as an illustrative example to show the differences between the theory for a rigid <span class="hlt">porous</span> medium, and small and large deformation analysis of a deforming <span class="hlt">porous</span> medium. It is found that the large deformation model produces shorter solute breakthrough times, followed by the small deformation model, and then the rigid <span class="hlt">porous</span> medium model. It is also found that it is important to include spatial and temporal void ratio variations in the large deformation analysis. It is shown that a non-linear large deformation model may greatly reduce the solute breakthrough time, compared to a standard transport analysis typically employed by environmental engineers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3673107','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3673107"><span id="translatedtitle">Photonic Crystal Sensors Based on <span class="hlt">Porous</span> Silicon</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Pacholski, Claudia</p> <p>2013-01-01</p> <p><span class="hlt">Porous</span> silicon has been established as an excellent sensing platform for the optical detection of hazardous chemicals and biomolecular interactions such as DNA hybridization, antigen/antibody binding, and enzymatic reactions. Its <span class="hlt">porous</span> nature provides a high surface area within a small volume, which can be easily controlled by changing the pore sizes. As the porosity and consequently the refractive index of an etched <span class="hlt">porous</span> silicon layer depends on the electrochemial etching conditions photonic crystals composed of multilayered <span class="hlt">porous</span> silicon films with well-resolved and narrow optical reflectivity features can easily be obtained. The prominent optical response of the photonic crystal decreases the detection limit and therefore increases the sensitivity of <span class="hlt">porous</span> silicon sensors in comparison to sensors utilizing Fabry-Pérot based optical transduction. Development of <span class="hlt">porous</span> silicon photonic crystal sensors which allow for the detection of analytes by the naked eye using a simple color change or the fabrication of stacked <span class="hlt">porous</span> silicon photonic crystals showing two distinct optical features which can be utilized for the discrimination of analytes emphasize its high application potential. PMID:23571671</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1997GeoRL..24..495M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1997GeoRL..24..495M"><span id="translatedtitle">Transport in fractured <span class="hlt">porous</span> solids</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Mattisson, Charlotte; Knackstedt, Mark A.; Senden, Tim J.</p> <p></p> <p>Laboratory measurements are made of the permeability and the resistivity of sintered <span class="hlt">porous</span> media with disordered fractures over a wide range of matrix porosity. We discuss the preparation and characterisation of the samples. Approximating the topology of a rough fracture by a single discrete fracture can introduce large errors in the prediction of the permeability. We test the validity of empirical expressions relating permeability, resistivity and porosity for fractured samples. Resistivity correlations with porosity are independent of the presence of fractures. In contrast, permeability correlations show a strong dependence. Attempts to decouple the permeability of the fractured sample as a parallel sum of matrix and fracture permeability leads to large errors. The results indicate that transport in a medium with two distinct families of pathways cannot be described by a single-valued transport coefficient.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2772207','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2772207"><span id="translatedtitle">Enhanced Biocompatibility of <span class="hlt">Porous</span> Nitinol</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Munroe, Norman; Pulletikurthi, Chandan; Haider, Waseem</p> <p>2009-01-01</p> <p><span class="hlt">Porous</span> Nitinol (PNT) has found vast applications in the medical industry as interbody fusion devices, synthetic bone grafts, etc. However, the tendency of the PNT to corrode is anticipated to be greater as compared to solid nitinol since there is a larger surface area in contact with body fluids. In such cases, surface preparation is known to play a major role in a material’s biocompatibility. In an effort to check the effect of surface treatments on the in vitro corrosion properties of PNT, in this investigation, they were subjected to different surface treatments such as boiling in water, dry heating, and passivation. The localized corrosion resistance of alloys before and after each treatment was evaluated in phosphate buffer saline solution (PBS) using cyclic polarization tests in accordance with ASTM F 2129-08. PMID:19956797</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998PhDT.......116R&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998PhDT.......116R&link_type=ABSTRACT"><span id="translatedtitle">Nonlinear flow in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Rojas, Sergio Jesus</p> <p>1998-07-01</p> <p>Numerical solutions of the Navier-Stokes equations in two-dimensional quasi-periodic and quasi-isotropic random media were obtained to analyze the local and large scale aspects of finite Reynolds number flow. For Reynolds number less than one, the results show a first correction to Darcy's law which is cubic in the Darcy (averaged) velocity, while for Reynolds number greater than one, the results are in agreement with Forchheimer equation. That is, the correction to Darcy's law is quadratic in the average (Darcy) velocity. The cubic correction to Darcy's law support Mei and Auriault's (1991) theoretical study, based on homogenization theory. In addition, the results show support to a unifying empirical equation describing fluid flow in <span class="hlt">porous</span> media of similar structure, first proposed by Beavers and Sparrow (1969). Also, the results show agreement, except by a multiplicative constant, with Sangani and Acrivos (1982) equation for the drag on dilute array of cylinders.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1016458','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1016458"><span id="translatedtitle">Foam Transport in <span class="hlt">Porous</span> Media - A Review</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Zhang, Z. F.; Freedman, Vicky L.; Zhong, Lirong</p> <p>2009-11-11</p> <p> transport of foam in <span class="hlt">porous</span> media is complicated in that the number of lamellae present governs flow characteristics such as viscosity, relative permeability, fluid distribution, and interactions between fluids. Hence, foam is a non-Newtonian fluid. During transport, foam destruction and formation occur. The net result of the two processes determines the foam texture (i.e., bubble density). Some of the foam may be trapped during transport. According to the <span class="hlt">impacts</span> of the aqueous and gas flow rates, foam flow generally has two regimes – weak and strong foam. There is also a minimum pressure gradient to initiate foam flow and a critical capillary for foam to be sustained. Similar to other fluids, the transport of foam is described by Darcy’s law with the exception that the foam viscosity is variable. Three major approaches to modeling foam transport in <span class="hlt">porous</span> media are the empirical, semi-empirical, and mechanistic methods. Mechanistic approaches can be complete in principal but may be difficult to obtain reliable parameters, whereas empirical and semi-empirical approaches can be limited by the detail used to describe foam rheology and mobility. Mechanistic approaches include the bubble population-balance model, the network/percolation theory, the catastrophe theory, and the filtration theory. Among these methods, all were developed for modeling polyhedral foam with the exception that the method based on the filtration theory was for the ball foam (microfoam).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014AIPC.1597...14Q','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014AIPC.1597...14Q"><span id="translatedtitle">Fundamental principals of battery design: <span class="hlt">Porous</span> electrodes</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Qu, Deyang</p> <p>2014-06-01</p> <p>The fundamental aspects of a <span class="hlt">porous</span> electrode from electrochemistry and material chemistry standpoints are discussed in the light of battery engineering designs. For example, the ionic diffusion, the electrode-electrolyte interface, interfacial charge transfer and electrode catalytic processes are discussed. The discussion of such fundamental electrochemical aspects is in conjunction with the design of batteries, e.g. the electrochemical assessable surface area for <span class="hlt">porous</span> electrode, electrode catalytic reactions. The <span class="hlt">porous</span> electrodes used as a gas diffusion electrode and the electrode in a supercapacitor are discussed to demonstrate the application of electrochemical principals in battery design.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/361800','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/361800"><span id="translatedtitle">Analysis of deformation of <span class="hlt">porous</span> metals</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Lee, D.N.; Oh, K.H.; Han, H.N.; Kim, H.S.</p> <p>1998-12-31</p> <p>The elasto-plastic finite element method using a yield criterion advanced by Lee and Kim was employed to analyze the effect of indenting geometry on the Brinell hardness of sintered <span class="hlt">porous</span> copper specimens with various densities. The changes in geometry of <span class="hlt">porous</span> iron rings with various initial relative densities were also calculated for various friction coefficients between the metal rings and compression platens. The calculated hardness values were in very good agreement with the measured data. The friction coefficient could be determined from the relationship between the change in the inner diameter and height reduction of <span class="hlt">porous</span> metal rings with various initial relative densities.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/27377976','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27377976"><span id="translatedtitle">Enzymatic Biofuel Cells on <span class="hlt">Porous</span> Nanostructures.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wen, Dan; Eychmüller, Alexander</p> <p>2016-09-01</p> <p>Biofuel cells (BFCs) that utilize enzymes as catalysts represent a new sustainable and renewable energy technology. Numerous efforts have been directed to improve the performance of the enzymatic BFCs (EBFCs) with respect to power output and operational stability for further applications in portable power sources, self-powered electrochemical sensing, implantable medical devices, etc. The latest advances in EBFCs based on <span class="hlt">porous</span> nanoarchitectures over the past 5 years are detailed here. <span class="hlt">Porous</span> matrices from carbon, noble metals, and polymers promote the development of EBFCs through the electron transfer and mass transport benefits. Some key issues regarding how these nanostructured <span class="hlt">porous</span> media improve the performance of EBFCs are also discussed. PMID:27377976</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/4139336','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/biblio/4139336"><span id="translatedtitle">METHOD OF IMPREGNATING A <span class="hlt">POROUS</span> MATERIAL</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Steele, G.N.</p> <p>1960-06-01</p> <p>A method of impregnating a <span class="hlt">porous</span> body with an inorganic uranium- containing salt is outlined and comprises dissolving a water-soluble uranium- containing salt in water; saturating the intercommunicating pores of the <span class="hlt">porous</span> body with the salt solution; infusing ammonia gas into the intercommunicating pores of the body, the ammonia gas in water chemically reacting with the water- soluble uranium-containing salt in the water solvent to form a nonwater-soluble uranium-containing precipitant; and evaporating the volatile unprecipitated products from the intercommunicating pores whereby the uranium-containing precipitate is uniformly distributed in the intercommunicating peres of the <span class="hlt">porous</span> body.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016EGUGA..1810215B&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016EGUGA..1810215B&link_type=ABSTRACT"><span id="translatedtitle">Dynamics of water evaporation from saline <span class="hlt">porous</span> media with mixed wettability</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bergstad, Mina; Shokri, Nima</p> <p>2016-04-01</p> <p>Understanding of the dynamics of salt transport and precipitation in <span class="hlt">porous</span> media during evaporation is of crucial concern in various environmental and hydrological applications such as soil salinization, rock weathering, terrestrial ecosystem functioning, microbiological activities and biodiversity in vadose zone. Vegetation, plant growth and soil organisms can be severely limited in salt-affected land. This process is influenced by the complex interaction among atmospheric conditions, transport properties of <span class="hlt">porous</span> media and properties of the evaporating solution (1-5). We investigated effects of mixed wettability conditions on salt precipitation during evaporation from saline <span class="hlt">porous</span> media. To do so, we conducted a series of evaporation experiments with sand mixtures containing different fractions of hydrophobic grains saturated with NaCl solutions. The dynamics of salt precipitation at the surface of sand columns (mounted on digital balances to record the evaporation curves) as well as the displacement of the receding drying front (the interface between wet and partially wet zone) were recorded using an automatic imaging system at well-defined time intervals. The experiments were conducted with sand packs containing 0, 25, 40, 50, 65, and 80% fraction of hydrophobic grains. All experiments were conducted in an environmental chamber in which the relative humidity and ambient temperature were kept constant at 30% and 30 C, respectively. Our results show that partial wettability conditions had minor <span class="hlt">impacts</span> on the evaporative mass losses from saline sand packs due to the presence of salt. This is significantly different than what is normally observed during evaporation from mixed wettability <span class="hlt">porous</span> media saturated with pure water (6). In our experiments, increasing the fraction of hydrophobic grains did not result in any notable reduction of the evaporative mass losses from saline <span class="hlt">porous</span> media. Our results show that the presence of hydrophobic grains on the surface</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009PhDT........77N&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009PhDT........77N&link_type=ABSTRACT"><span id="translatedtitle">Computational characterization of diffusive mass transfer in <span class="hlt">porous</span> solid oxide fuel cell components</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Nelson, George J.</p> <p></p> <p>Diffusive mass transport within <span class="hlt">porous</span> SOFC components is explored using two modeling approaches that can better inform the SOFC electrode design process. These approaches include performance metrics for electrode cross-sectional design and a fractal approach for modeling mass transport within the pore structure of the electrode reaction zone. The performance metrics presented are based on existing analytical models for transport within SOFC electrodes. These metrics include a correction factor for button-cell partial pressure predictions and two forms of dimensionless reactant depletion current density. The performance <span class="hlt">impacts</span> of multi-dimensional transport phenomena are addressed through the development of design maps that capture the trade-offs inherent in the reduction of mass transport losses within SOFC electrode cross-sections. As a complement to these bulk electrode models, a fractal model is presented for modeling diffusion within the electrochemically active region of an SOFC electrode. The <span class="hlt">porous</span> electrode is separated into bulk and reaction zone regions, with the bulk electrode modeled in one-dimension based on the dusty-gas formalism. The reaction zone is modeled in detail with a two-dimensional finite element model using a regular Koch pore cross-section as a fractal template for the pore structure. Drawing on concepts from the analysis of <span class="hlt">porous</span> catalysts, this model leads to a straightforward means of assessing the performance <span class="hlt">impacts</span> of reaction zone microstructure. Together, the modeling approaches presented provide key insights into the <span class="hlt">impacts</span> of bulk and microstructural geometry on the performance of <span class="hlt">porous</span> SOFC components.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015Geomo.228..608Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015Geomo.228..608Z"><span id="translatedtitle">Trajectories of saltating sand particles behind a <span class="hlt">porous</span> fence</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhang, Ning; Lee, Sang Joon; Chen, Ting-Guo</p> <p>2015-01-01</p> <p>Trajectories of aeolian sand particles behind a <span class="hlt">porous</span> wind fence embedded in a simulated atmospheric boundary layer were visualized experimentally, to investigate the shelter effect of the fence on sand saltation. Two sand samples, one collected from a beach (d = 250 μm) and the other from a desert (d = 100 μm), were tested in comparison with the previous studies of a 'no-fence' case. A wind fence (ε = 38.5%) was installed on a flat sand bed filled with each sand sample. A high-speed photography technique and the particle tracking velocimetry (PTV) method were employed to reconstruct the trajectories of particles saltating behind the fence. The collision processes of these sand particles were analyzed, momentum and kinetic energy transfer between saltating particles and ground surface were also investigated. In the wake region, probability density distributions of the <span class="hlt">impact</span> velocities agree well with the pattern of no-fence case, and can be explained by a log-normal law. The horizontal component of <span class="hlt">impact</span> velocity for the beach sand is decreased by about 54%, and about 76% for the desert sand. Vertical restitution coefficients of bouncing particles are smaller than 1.0 due to the presence of the wind fence. The saltating particles lose a large proportion of their energy during the collision process. These results illustrate that the <span class="hlt">porous</span> wind fence effectively abates the further evolution of saltating sand particles.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19920042128&hterms=fluids+supercritical&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3Dfluids%2Bsupercritical','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19920042128&hterms=fluids+supercritical&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3Dfluids%2Bsupercritical"><span id="translatedtitle">Convection in superposed fluid and <span class="hlt">porous</span> layers</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Chen, Falin; Chen, C. F.</p> <p>1992-01-01</p> <p>Thermal convection due to heating from below in a <span class="hlt">porous</span> layer underlying a fluid layer has been analyzed using the Navier-Stokes equations for the fluid layers and the extended Darcy equation (including Brinkman and Forchheimer terms) for the <span class="hlt">porous</span> layer. The flow is assumed to be two-dimensional and periodic in the horizontal direction. The numerical scheme used is a combined Galerkin and finite-difference method, and appropriate boundary conditions are applied at the interface. Results have been obtained for depth ratios of 0, 0.1, 0.2, 0.5, and 1.0, where this ratio is defined as the ratio of the thickness of the fluid layer to that of the <span class="hlt">porous</span> layer. For the depth ratio of 0.1, the convection is dominated by the <span class="hlt">porous</span> layer, similar to the situation at onset, even though the Rayleigh number for the fluid layer is well into the supercritical regime.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20050160254','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20050160254"><span id="translatedtitle">Drag Measurements of <span class="hlt">Porous</span> Plate Acoustic Liners</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Wolter, John D.</p> <p>2005-01-01</p> <p>This paper presents the results of direct drag measurements on a variety of <span class="hlt">porous</span> plate acoustic liners. The existing literature describes numerous studies of drag on <span class="hlt">porous</span> walls with injection or suction, but relatively few of drag on <span class="hlt">porous</span> plates with neither injection nor suction. Furthermore, the porosity of the <span class="hlt">porous</span> plate in existing studies is much lower than typically used in acoustic liners. In the present work, the acoustic liners consisted of a perforated face sheet covering a bulk acoustic absorber material. Factors that were varied in the experiment were hole diameter, hole pattern, face sheet thickness, bulk material type, and size of the gap (if any) between the face sheet and the absorber material.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20080004191','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20080004191"><span id="translatedtitle">Ring connection for <span class="hlt">porous</span> combustor wall panels</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Verdouw, Albert J. (Inventor)</p> <p>1980-01-01</p> <p>A gas turbine engine combustor assembly of unique configuration has an outer wall made up of a plurality of axially extending multi-layered <span class="hlt">porous</span> metal panels joined together at butt joints therebetween by a reinforcing and heat dissipation ring and a unique weld configuration to prevent thermal erosion of the ends of the <span class="hlt">porous</span> metal panels at the butt joints; the combustor further including a unique inner wall made up of a plurality of like axially extending multi-layered <span class="hlt">porous</span> metal panels joined at butt joints by a reinforcing and heat dissipation ring on the inner surface of the inner wall panels and an improved butt weld joint that prevents thermal erosion of the ends of the <span class="hlt">porous</span> metal inner wall panels.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/10117349','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10117349"><span id="translatedtitle">Multiphase flow in fractured <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Firoozabadi, A.</p> <p>1995-02-01</p> <p>The major goal of this research project was to improve the understanding of the gas-oil two-phase flow in fractured <span class="hlt">porous</span> media. In addition, miscible displacement was studied to evaluate its promise for enhanced recovery.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/22990753','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/22990753"><span id="translatedtitle">Methane storage in advanced <span class="hlt">porous</span> materials.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Makal, Trevor A; Li, Jian-Rong; Lu, Weigang; Zhou, Hong-Cai</p> <p>2012-12-01</p> <p>The need for alternative fuels is greater now than ever before. With considerable sources available and low pollution factor, methane is a natural choice as petroleum replacement in cars and other mobile applications. However, efficient storage methods are still lacking to implement the application of methane in the automotive industry. Advanced <span class="hlt">porous</span> materials, metal-organic frameworks and <span class="hlt">porous</span> organic polymers, have received considerable attention in sorptive storage applications owing to their exceptionally high surface areas and chemically-tunable structures. In this critical review we provide an overview of the current status of the application of these two types of advanced <span class="hlt">porous</span> materials in the storage of methane. Examples of materials exhibiting high methane storage capacities are analyzed and methods for increasing the applicability of these advanced <span class="hlt">porous</span> materials in methane storage technologies described. PMID:22990753</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JPhD...49F5301J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JPhD...49F5301J"><span id="translatedtitle">Enhancement of a dynamic <span class="hlt">porous</span> model considering compression-release hysteresis behavior: application to graphite</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Jodar, B.; Seisson, G.; Hébert, D.; Bertron, I.; Boustie, M.; Berthe, L.</p> <p>2016-08-01</p> <p>Because of their shock wave attenuation properties, <span class="hlt">porous</span> materials and foams are increasingly used for various applications such as graphite in the aerospace industry and polyurethane (PU) foams in biomedical engineering. For these two materials, the absence of residual compaction after compression and release cycles limits the efficiency of the usual numerical dynamic <span class="hlt">porous</span> models such as P-α and POREQST. In this paper, we suggest a simple enhancement of the latter in order to take into account the compression-release hysteresis behavior experimentally observed for the considered materials. The new model, named H-POREQST, was implemented into a Lagrangian hydrocode and tested for simulating plate <span class="hlt">impact</span> experiments at moderate pressure onto a commercial grade of <span class="hlt">porous</span> graphite (EDM3). It proved to be in far better agreement with experimental data than the original model which encourages us to pursue numerical tests and developments.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011PhDT.......205M&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011PhDT.......205M&link_type=ABSTRACT"><span id="translatedtitle">Synthesis and gas adsorption study of <span class="hlt">porous</span> metal-organic framework materials</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Mu, Bin</p> <p></p> <p>Metal-organic frameworks (MOFs) or <span class="hlt">porous</span> coordination polymers (PCPs) have become the focus of intense study over the past decade due to their potential for advancing a variety of applications including air purification, gas storage, adsorption separations, catalysis, gas sensing, drug delivery, and so on. These materials have some distinct advantages over traditional <span class="hlt">porous</span> materials such as the well-defined structures, uniform pore sizes, chemically functionalized sorption sites, and potential for postsynthetic modification, etc. Thus, synthesis and adsorption studies of <span class="hlt">porous</span> MOFs have increased substantially in recent years. Among various prospective applications, air purification is one of the most immediate concerns, which has urgent requirements to improve current nuclear, biological, and chemical (NBC) filters <span class="hlt">involving</span> commercial and military purposes. Thus, the major goal of this funded project is to search, synthesize, and test these novel hybrid <span class="hlt">porous</span> materials for adsorptive removal of toxic industrial chemicals (TICs) and chemical warfare agents (CWAs), and to install the benchmark for new-generation NBC filters. The objective of this study is three-fold: (i) Advance our understanding of coordination chemistry by synthesizing novel MOFs and characterizing these <span class="hlt">porous</span> coordination polymers; (ii) Evaluate <span class="hlt">porous</span> MOF materials for gasadsorption applications including CO2 capture, CH4 storage, other light gas adsorption and separations, and examine the chemical and physical properties of these solid adsorbents including thermal stability and heat capacity of MOFs; (iii) Evaluate <span class="hlt">porous</span> MOF materials for next-generation NBC filter media by adsorption breakthrough measurements of TICs on MOFs, and advance our understanding about structureproperty relationships of these novel adsorbents.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li class="active"><span>19</span></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_19 --> <div id="page_20" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li class="active"><span>20</span></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="381"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20050210230&hterms=polystyrene&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3Dpolystyrene','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20050210230&hterms=polystyrene&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3Dpolystyrene"><span id="translatedtitle"><span class="hlt">Porous</span> Ceramic Spheres from Ion Exchange Resin</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Dynys, Fred</p> <p>2005-01-01</p> <p>A commercial cation ion exchange resin, cross-linked polystyrene, has been successfully used as a template to fabricate 20 to 50 micron <span class="hlt">porous</span> ceramic spheres. Ion exchange resins have dual template capabilities. Pore architecture of the ceramic spheres can be altered by changing the template pattern. Templating can be achieved by utilizing the internal <span class="hlt">porous</span> structure or the external surface of the resin beads. Synthesis methods and chemical/physical characteristics of the ceramic spheres will be reported.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1083909','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1083909"><span id="translatedtitle"><span class="hlt">Porous</span> polymeric materials for hydrogen storage</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Yu, Luping; Liu, Di-Jia; Yuan, Shengwen; Yang, Junbing</p> <p>2013-04-02</p> <p>A <span class="hlt">porous</span> polymer, poly-9,9'-spirobifluorene and its derivatives for storage of H.sub.2 are prepared through a chemical synthesis method. The <span class="hlt">porous</span> polymers have high specific surface area and narrow pore size distribution. Hydrogen uptake measurements conducted for these polymers determined a higher hydrogen storage capacity at the ambient temperature over that of the benchmark materials. The method of preparing such polymers, includes oxidatively activating solids by CO.sub.2/steam oxidation and supercritical water treatment.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/5136537','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/biblio/5136537"><span id="translatedtitle">Method for preparing <span class="hlt">porous</span> metal hydride compacts</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Ron, M.; Gruen, D.M.; Mendelsohn, M.H.; Sheft, I.</p> <p>1980-01-21</p> <p>A method for preparing <span class="hlt">porous</span> metallic-matrix hydride compacts which can be repeatedly hydrided and dehydrided without disintegration. A mixture of a finely divided metal hydride and a finely divided matrix metal is contacted with a poison which prevents the metal hydride from dehydriding at room temperature and atmospheric pressure. The mixture of matrix metal and poisoned metal hydride is then compacted under pressure at room temperature to form <span class="hlt">porous</span> metallic-matrix hydride compacts.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/864009','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/864009"><span id="translatedtitle">Method for preparing <span class="hlt">porous</span> metal hydride compacts</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Ron, Moshe; Gruen, Dieter M.; Mendelsohn, Marshall H.; Sheft, Irving</p> <p>1981-01-01</p> <p>A method for preparing <span class="hlt">porous</span> metallic-matrix hydride compacts which can be repeatedly hydrided and dehydrided without disintegration. A mixture of a finely divided metal hydride and a finely divided matrix metal is contacted with a poison which prevents the metal hydride from dehydriding at room temperature and atmospheric pressure. The mixture of matrix metal and poisoned metal hydride is then compacted under pressure at room temperature to form <span class="hlt">porous</span> metallic-matrix hydride compacts.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013ccs..book..373R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013ccs..book..373R"><span id="translatedtitle">Computational Representation of <span class="hlt">Porous</span> Media Features (Porosity, Permeability, Saturation and Physical Heterogeneous Geometry)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ramírez-López, A.; Muñoz-Negrón, D.; Palomar-Pardavé, M.; Escarela-Perez, R.; Cruz-Morales, V.</p> <p></p> <p>In materials science the properties representation in anisotropic materials is a very important topic. <span class="hlt">Porous</span> media are heterogeneous in nature. Their representation is frequently assumed as a complex problem and difficult to be treated using normal numerical methods. Chaos theory is used to treat problems without established rules in different topics. The present work is focused to show the development of some computational algorithms to simulate the <span class="hlt">porous</span> media properties such as porosity, permeability and saturation. The procedures <span class="hlt">involve</span> the employ of a random number generator to assign properties. The result is amorphous media formed using a cellular automaton. This work also includes the development of some amorphous geometry to represent solid walls in empty samples in order to represent tortuosity of a <span class="hlt">porous</span> media specimen. Finally advantages and disadvantages of the models developed are commented.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25873105','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25873105"><span id="translatedtitle">Extreme Flexibility in a Zeolitic Imidazolate Framework: <span class="hlt">Porous</span> to Dense Phase Transition in Desolvated ZIF-4.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wharmby, Michael T; Henke, Sebastian; Bennett, Thomas D; Bajpe, Sneha R; Schwedler, Inke; Thompson, Stephen P; Gozzo, Fabia; Simoncic, Petra; Mellot-Draznieks, Caroline; Tao, Haizheng; Yue, Yuanzheng; Cheetham, Anthony K</p> <p>2015-05-26</p> <p>Desolvated zeolitic imidazolate framework ZIF-4(Zn) undergoes a discontinuous <span class="hlt">porous</span> to dense phase transition on cooling through 140 K, with a 23 % contraction in unit cell volume. The structure of the non-<span class="hlt">porous</span>, low temperature phase was determined from synchrotron X-ray powder diffraction data and its density was found to be slightly less than that of the densest ZIF phase, ZIF-zni. The mechanism of the phase transition <span class="hlt">involves</span> a cooperative rotation of imidazolate linkers resulting in isotropic framework contraction and pore space minimization. DFT calculations established the energy of the new structure relative to those of the room temperature phase and ZIF-zni, while DSC measurements indicate the entropic stabilization of the <span class="hlt">porous</span> room temperature phase at temperatures above 140 K. PMID:25873105</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/13828','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/13828"><span id="translatedtitle">Optimization of Fluid Front Dynamics in <span class="hlt">Porous</span> Media Using Rate Control: I. Equal Mobility Fluids</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Sundaryanto, Bagus; Yortsos, Yanis C.</p> <p>1999-10-18</p> <p>In applications <span class="hlt">involving</span> this injection of a fluid in a <span class="hlt">porous</span> medium to displace another fluid, a main objective is the maximization of the displacement efficiency. For a fixed arrangement of injection and production points (sources and sinks), such optimization is possible by controlling the injection rate policy. Despite its practical relevance, however, this aspect has received scant attention in the literature. In this paper, a fundamental approach based on optimal control theory, for the case when the fluids are miscible, of equal viscosity and in the absence of dispersion and gravity effects. Both homogeneous and heterogeneous <span class="hlt">porous</span> media are considered. From a fluid dynamics viewpoint, this is a problem in the deformation of material lines in <span class="hlt">porous</span> media, as a function of time-varying injection rates.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26148675','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26148675"><span id="translatedtitle">On-chip <span class="hlt">porous</span> microgel generation for microfluidic enhanced VEGF detection.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Zhao, Zhengtuo; Al-Ameen, Mohammad Ali; Duan, Kai; Ghosh, Gargi; Lo, Joe Fujiou</p> <p>2015-12-15</p> <p>Advances in medical diagnostics and personalized therapy require sensitive and rapid measurement of minute amounts of proteins from patients. Standard ELISA is difficult to prepare and <span class="hlt">involves</span> lengthy protocols. Here we report a novel method using capture antibody immobilized <span class="hlt">porous</span> poly (ethylene) glycol diacrylate (PEGDA) hydrogel microspheres to enable high sensitivity VEGF detection in arrayed microfluidics. Our technique incorporates antibody encapsulation, trapping, and flow perfusion on a single device. We showed that the convergence of tunable <span class="hlt">porous</span> hydrogel with efficient microfluidics improved the sensitivity of the assay. The detection limit of this microfluidic <span class="hlt">porous</span> microgel based assay was 0.9 pg/mL, with only 1+ hour of assay time, demonstrating a novel assay that exceeded conventional technologies in terms of sensitivity and speed. PMID:26148675</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3606024','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3606024"><span id="translatedtitle">Performance characteristics of new superficially <span class="hlt">porous</span> particles☆</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>DeStefano, Joseph J.; Schuster, Stephanie A.; Lawhorn, Jason M.; Kirkland, Joseph J.</p> <p>2013-01-01</p> <p>Superficially <span class="hlt">porous</span> particles (also called Fused-Core, core shell or <span class="hlt">porous</span> shell particles) show distinct advantages over comparable totally <span class="hlt">porous</span> particles for separating small molecules. Columns of Fused-Core particles exhibit very high efficiency because of superior eddy dispersion properties (smaller van Deemter A term). The efficiency for columns of 2.7 μm Fused-Core particles actually rivals that for sub-2 μm totally <span class="hlt">porous</span> particles with only about one-half the back pressure. These Fused-Core particles show special advantages with larger molecules for fast separations at high mobile phase velocities because of superior mass transfer (kinetic) properties (smaller van Deemter C term). This report describes the effect of different particle size and <span class="hlt">porous</span> shell thicknesses on chromatographic performance for Fused-Core particles. Particle characteristics can significantly affect factors of separation importance. For example, the reduced plate height of packed columns is affected by particle diameter. Interestingly, larger Fused-Core particles show smaller reduced plate heights than smaller Fused-Core particles. Also, <span class="hlt">porous</span> shell thickness has a strong effect on solute retention as well as separation efficiency, and particle surface area has a direct influence on sample loading characteristics. Fused-Core particles with a wide range of physical characteristics have been developed that allows the preparation of stable, efficient packed columns. PMID:22939204</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016GeoRL..43.4426B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016GeoRL..43.4426B"><span id="translatedtitle">Evaporation of NaCl solution from <span class="hlt">porous</span> media with mixed wettability</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bergstad, Mina; Shokri, Nima</p> <p>2016-05-01</p> <p>Evaporation of saline water from <span class="hlt">porous</span> media is ubiquitous in many processes including soil salinization, crop production, and CO2 sequestration in deep saline acquirer. It is controlled by the transport properties of <span class="hlt">porous</span> media, atmospheric conditions, and properties of the evaporating saline solution. In the present study, the effects of mixed wettability conditions on the general dynamics of water evaporation from <span class="hlt">porous</span> media saturated with NaCl solution were investigated. To do so, we conducted a comprehensive series of evaporation experiments using sand mixtures containing different fractions of hydrophobic grains saturated with NaCl solutions. Our results showed that increasing fraction of hydrophobic grains in the mixed wettability sand pack had minor <span class="hlt">impact</span> on the evaporative mass losses due to the presence of salt whose precipitation patterns were significantly influenced by the mixed wettability condition. Through macroscale and microscale investigations, we found formation of patchy efflorescence in the case of mixed wettability sand pack as opposed to crusty efflorescence in the case of completely hydrophilic <span class="hlt">porous</span> media. Furthermore, the presence of salty water and hydrophobic grains in the sand pack significantly influenced the general dynamics and morphology of the receding drying front. Our results extend the understanding of the saline water evaporation from <span class="hlt">porous</span> media with direct applications to various hydrological and engineering processes.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/934774','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/934774"><span id="translatedtitle">Continuous time random walk analysis of solute transport in fractured <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Cortis, Andrea; Cortis, Andrea; Birkholzer, Jens</p> <p>2008-06-01</p> <p>The objective of this work is to discuss solute transport phenomena in fractured <span class="hlt">porous</span> media, where the macroscopic transport of contaminants in the highly permeable interconnected fractures can be strongly affected by solute exchange with the <span class="hlt">porous</span> rock matrix. We are interested in a wide range of rock types, with matrix hydraulic conductivities varying from almost impermeable (e.g., granites) to somewhat permeable (e.g., <span class="hlt">porous</span> sandstones). In the first case, molecular diffusion is the only transport process causing the transfer of contaminants between the fractures and the matrix blocks. In the second case, additional solute transfer occurs as a result of a combination of advective and dispersive transport mechanisms, with considerable <span class="hlt">impact</span> on the macroscopic transport behavior. We start our study by conducting numerical tracer experiments employing a discrete (microscopic) representation of fractures and matrix. Using the discrete simulations as a surrogate for the 'correct' transport behavior, we then evaluate the accuracy of macroscopic (continuum) approaches in comparison with the discrete results. However, instead of using dual-continuum models, which are quite often used to account for this type of heterogeneity, we develop a macroscopic model based on the Continuous Time Random Walk (CTRW) framework, which characterizes the interaction between the fractured and <span class="hlt">porous</span> rock domains by using a probability distribution function of residence times. A parametric study of how CTRW parameters evolve is presented, describing transport as a function of the hydraulic conductivity ratio between fractured and <span class="hlt">porous</span> domains.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/965134','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/965134"><span id="translatedtitle">Desiccation of unsaturated <span class="hlt">porous</span> media: Intermediate-scale experiments and numerical simulation</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Oostrom, Martinus; Wietsma, Thomas W.; Dane, J. H.; Truex, Michael J.; Ward, Anderson L.</p> <p>2009-08-01</p> <p>Soil desiccation (drying) is recognized as a potentially robust vadose zone remediation process <span class="hlt">involving</span> water evaporation induced by air injection and extraction. Desiccation has the potential to immobilize contaminants and could potentially improve access for other gas-phase treatments by reducing water saturation and therefore increasing sediment gas-phase permeability. Before this technology could be deployed in the field, concerns related to energy limitations, osmotic effects, and potential contaminant remobilization after rewetting need to be addressed. A series of detailed wedge-shaped, intermediate-scale laboratory experiments in unsaturated homogeneous and simple heterogeneous systems was conducted to improve the understanding of the <span class="hlt">impact</span> of energy balance issues on soil desiccation. The experiments were simulated with the multifluid flow simulator STOMP, using independently obtained hydraulic and thermal <span class="hlt">porous</span> medium properties. In all the experiments, the injection of dry air proved to be an effective means for removing essentially all moisture from the test media. Evaporative cooling was observed which generally decreased with increased distance from the gas inlet chamber. Observations of temperature in fine-grained sands in the heterogeneous systems show two local temperature minima associated with the cooling. The first one occurs because of evaporation in the adjacent medium-grained sand whereas the second minimum is attributed to evaporative cooling in the fine-grained sand itself. Results of the laboratory tests were simulated accurately when thermal properties of the flow cell walls and insulation material were taken into account, indicating that the proper physics were incorporated into the simulator.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015E%26ES...27a2027S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015E%26ES...27a2027S"><span id="translatedtitle">Modeling of seismic field in <span class="hlt">porous</span> medium:Simulation study of single pore and pore ensemble effects</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Shatskaya, A. A.; Nemirovich-Danchenko, M. M.; Terre, D. A.</p> <p>2015-11-01</p> <p>The article considers the effect of <span class="hlt">porous</span> media on elastic wave field. Based on numerical modeling, diffraction pattern of the wave propagating through a single pore in carbonates has been produced. Matrix properties (calcite and dolomite) and fluid (water) are modeled based on thin core section image. The qualitative comparison with the available computational data has been performed. Provided that ensemble of pores is <span class="hlt">involved</span>, the effect of <span class="hlt">porous</span> medium on seismic field has been studied. For comparison with experimental data the model of <span class="hlt">porous</span> sintered aluminum Al-6061 has been considered. The processing of numerical modeling results made it possible to estimate average velocities in the model of <span class="hlt">porous</span> aluminum and compare them with physical modeling data. The provided estimates have indicated qualitative (single pore) and quantitative (ensemble of pores) correlation of simulation and experiment results.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26628117','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26628117"><span id="translatedtitle">Measurement of colloidal phenomena during flow through refractive index matched <span class="hlt">porous</span> media.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Roth, Eric J; Mont-Eton, Michael E; Gilbert, Benjamin; Lei, Tim C; Mays, David C</p> <p>2015-11-01</p> <p>Colloidal phenomena in <span class="hlt">porous</span> media, natural or engineered, are important in a breadth of science and technology applications, but fundamental understanding is hampered by the difficulty in measuring colloid deposit morphology in situ. To partially address this need, this paper describes a static light scattering apparatus using a flow cell filled with refractive index matched (RIM) <span class="hlt">porous</span> media, allowing real-time measurement of colloidal phenomena as a function of depth within the flow cell. A laser interacts with the colloids in the pore space and their structures, but not with the RIM media. The intensity of scattered light is measured as a function of scattering angle, which allows characterization of colloid deposit morphology as a fractal dimension and a radius of gyration. In parallel, fluid discharge rate and pressure drop are recorded to determine permeability, a key parameter for any application <span class="hlt">involving</span> flow through <span class="hlt">porous</span> media. This apparatus should prove useful in any application requiring characterization of colloidal phenomena within <span class="hlt">porous</span> media. Additionally, this paper describes how to use granular Nafion as RIM <span class="hlt">porous</span> media. PMID:26628117</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/27285778','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27285778"><span id="translatedtitle">A novel strategy for the preparation of <span class="hlt">porous</span> microspheres and its application in peptide drug loading.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wei, Yi; Wang, Yuxia; Zhang, Huixia; Zhou, Weiqing; Ma, Guanghui</p> <p>2016-09-15</p> <p>A new strategy is developed to prepare <span class="hlt">porous</span> microspheres with narrow size distribution for peptides controlled release, <span class="hlt">involving</span> a fabrication of <span class="hlt">porous</span> microspheres without any porogens followed by a pore closing process. Amphiphilic polymers with different hydrophobic segments (poly(monomethoxypolyethylene glycol-co-d,l-lactide) (mPEG-PLA), poly(monomethoxypolyethylene glycol-co-d,l-lactic-co-glycolic acid) (mPEG-PLGA)) are employed as microspheres matrix to prepare <span class="hlt">porous</span> microspheres based on a double emulsion-premix membrane emulsification technique combined with a solvent evaporation method. Both microspheres possess narrow size distribution and <span class="hlt">porous</span> surface, which are mainly caused by (a) hydrophilic polyethylene glycol (PEG) segments absorbing water molecules followed by a water evaporation process and (b) local explosion of microspheres due to fast evaporation of dichloromethane (MC). Importantly, mPEG-PLGA microspheres have a honeycomb like structure while mPEG-PLA microspheres have a solid structure internally, illustrating that the different hydrophobic segments could modulate the affinity between solvent and matrix polymer and influence the phase separation rate of microspheres matrix. Long term release patterns are demonstrated with pore-closed microspheres, which are prepared from mPEG-PLGA microspheres loading salmon calcitonin (SCT). These results suggest that it is potential to construct <span class="hlt">porous</span> microspheres for drug sustained release using permanent geometric templates as new porogens. PMID:27285778</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3051409','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3051409"><span id="translatedtitle">Bioconjugate functionalization of thermally carbonized <span class="hlt">porous</span> silicon using a radical coupling reaction†</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Sciacca, Beniamino; Alvarez, Sara D.; Geobaldo, Francesco; Sailor, Michael J.</p> <p>2011-01-01</p> <p>The high stability of Salonen’s thermally carbonized <span class="hlt">porous</span> silicon (TCPSi) has attracted attention for environmental and biochemical sensing applications, where corrosion-induced zero point drift of <span class="hlt">porous</span> silicon-based sensor elements has historically been a significant problem. Prepared by the high temperature reaction of <span class="hlt">porous</span> silicon with acetylene gas, the stability of this silicon carbide-like material also poses a challenge—many sensor applications require a functionalized surface, and the low reactivity of TCPSi has limited the ability to chemically modify its surface. This work presents a simple reaction to modify the surface of TCPSi with an alkyl carboxylate. The method <span class="hlt">involves</span> radical coupling of a dicarboxylic acid (sebacic acid) to the TCPSi surface using a benzoyl peroxide initiator. The grafted carboxylic acid species provides a route for bioconjugate chemical modification, demonstrated in this work by coupling propylamine to the surface carboxylic acid group through the intermediacy of pentafluorophenol and 1-ethyl-3-[3-dimethylaminopropyl]carbodiimide hydrochloride (EDC). The stability of the carbonized <span class="hlt">porous</span> Si surface, both before and after chemical modification, is tested in phosphate buffered saline solution and found to be superior to either hydrosilylated (with undecylenic acid) or thermally oxidized <span class="hlt">porous</span> Si surfaces. PMID:20967329</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/6217714','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/6217714"><span id="translatedtitle">Model for high rate gas flows in deformable and reactive <span class="hlt">porous</span> beds</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Weston, A M</p> <p>1985-01-08</p> <p>This report presents the development of a one dimensional planar Lagrange hydrodynamic computer model which describes the processes preceding detonation. The model treats gas flow, deflagration, and compaction in a <span class="hlt">porous</span> bed of reactive material. The early part of deflagration to detonation experiment with <span class="hlt">porous</span> HMX is simulated. Sensitivity of the simulation calculation to ignition and burn rate parameters is illustrated and discussed. The effects of changing the mean particle size of the <span class="hlt">porous</span> material are investigated. There is widespread interest in runaway reaction hazards that may be associated with porosity in propellant and explosive materials. Experimentally, such reactions are initiated and observed in long, thick walled hollow tubes, filled with a granular <span class="hlt">porous</span> bed of reactive material. We will present comparisons with an experiment on <span class="hlt">porous</span> HMX to illustrate details of the model and to point out what we believe are important features of the observed phenomenon. A geometric finite element cell is devised that allows gas to flow through a compacting matrix. The experimental simulation considers the DDT process from initial squib burn through the onset of general matrix deflagration (convective burning), to the development of a fully dense compaction wave. While this simulation did not calculate turnover to detonation, it did illustrate that the transition occurred as soon as the compaction wave became fully dense. It is shown that deflagration and gas permeation lags compaction at the time of transition. This suggests that the actual transition <span class="hlt">involves</span> an additional compaction dependent process. 18 references, 20 figures, 3 tables.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015RScI...86k3103R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015RScI...86k3103R"><span id="translatedtitle">Measurement of colloidal phenomena during flow through refractive index matched <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Roth, Eric J.; Mont-Eton, Michael E.; Gilbert, Benjamin; Lei, Tim C.; Mays, David C.</p> <p>2015-11-01</p> <p>Colloidal phenomena in <span class="hlt">porous</span> media, natural or engineered, are important in a breadth of science and technology applications, but fundamental understanding is hampered by the difficulty in measuring colloid deposit morphology in situ. To partially address this need, this paper describes a static light scattering apparatus using a flow cell filled with refractive index matched (RIM) <span class="hlt">porous</span> media, allowing real-time measurement of colloidal phenomena as a function of depth within the flow cell. A laser interacts with the colloids in the pore space and their structures, but not with the RIM media. The intensity of scattered light is measured as a function of scattering angle, which allows characterization of colloid deposit morphology as a fractal dimension and a radius of gyration. In parallel, fluid discharge rate and pressure drop are recorded to determine permeability, a key parameter for any application <span class="hlt">involving</span> flow through <span class="hlt">porous</span> media. This apparatus should prove useful in any application requiring characterization of colloidal phenomena within <span class="hlt">porous</span> media. Additionally, this paper describes how to use granular Nafion as RIM <span class="hlt">porous</span> media.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20060021945','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20060021945"><span id="translatedtitle">Conceptual Design of a Condensing Heat Exchanger for Space Systems Using <span class="hlt">Porous</span> Media</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Hasan, Mohammad M.; Khan, Lutful I.; Nayagam, Vedha; Balasubramaniam, Ramaswamy</p> <p>2006-01-01</p> <p>Condensing heat exchangers are used in many space applications in the thermal and humidity control systems. In the International Space Station (ISS), humidity control is achieved by using a water cooled fin surface over which the moist air condenses, followed by "slurper bars" that take in both the condensate and air into a rotary separator and separates the water from air. The use of a cooled <span class="hlt">porous</span> substrate as the condensing surface provides and attractive alternative that combines both heat removal as well as liquid/gas separation into a single unit. By selecting the pore sizes of the <span class="hlt">porous</span> substrate a gravity independent operation may also be possible with this concept. Condensation of vapor into and on the <span class="hlt">porous</span> surface from the flowing air and the removal of condensate from the <span class="hlt">porous</span> substrate are the critical processes <span class="hlt">involved</span> in the proposed concept. This paper describes some preliminary results of the proposed condensate withdrawal process and discusses the on-going design and development work of a <span class="hlt">porous</span> media based condensing heat exchanger at the NASA Glenn Research Center in collaboration with NASA Johnson Space Center.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/23122704','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/23122704"><span id="translatedtitle"><span class="hlt">Porous</span> silicon biosensor: current status.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Dhanekar, Saakshi; Jain, Swati</p> <p>2013-03-15</p> <p>Biosensing technologies cater to modern day diagnostics and point of care multi-specialty clinics, hospitals and laboratories. Biosensors aggregate the sensitivity of detection methodologies and constitutional selectivity of biomolecules. Endeavors to develop highly sensitive, fast, stable and low cost biosensors have been made possible by extensive and arduous research. Immense research work is going on for detection of molecules using various materials as immobilization substrate and sensing elements. Amongst materials being used as bio-sensing substrates, nano-<span class="hlt">porous</span> silicon (PS) has amassed attention and gained popularity in recent years. It has captivating and tunable features like ease of fabrication, special optico-physico properties, tailored morphological structure and versatile surface chemistry enhancing its prospects as transducer for fabricating biosensors. The present review describes the fabrication of PS and its biosensing capabilities for detection of various analytes including, but not limited to, glucose, DNA, antibodies, bacteria and viruses. Attention has been consecrated on the various methodologies such as electrical, electrochemical, optical and label free techniques along with the performances of these biosensors. It concludes with some future prospects and challenges of PS based biosensors. PMID:23122704</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li class="active"><span>20</span></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_20 --> <div id="page_21" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li class="active"><span>21</span></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="401"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2000PhRvB..62.3674G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2000PhRvB..62.3674G"><span id="translatedtitle">Lattice Boltzmann description of magnetization in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Guyer, R. A.; McCall, K. R.</p> <p>2000-08-01</p> <p>The magnetic moments of fluid particles filling the pore space of a <span class="hlt">porous</span> material (1) reside in a complex space, (2) are carried by the particles in diffusive exploration of the pore space, and (3) relax when the particles approach relaxation sites on the walls of the pore space. Further, when the magnetic moments are the object of a nuclear magnetic resonance experiment, they are manipulated by rf magnetic fields, internal magnetic field gradients, and applied magnetic field gradient pulses. In this paper, a lattice Boltzmann computational procedure is described that accounts for all of the vagaries in the experience of a magnetic moment in a <span class="hlt">porous</span> material. The time evolution of the longitudinal and transverse magnetization, in a variety of experimental situations, can be simulated with this computational procedure. The z component of the magnetization, the longitudinal magnetization, is described by a set of coarse grained distribution functions for a scalar fluid. The time evolution of these distribution functions <span class="hlt">involves</span> a scattering process (to account for diffusion) and a probability of transmission out of the pore space (to account for surface relaxation). A numerical example, <span class="hlt">involving</span> a pore adjacent to a microporous region, is examined in detail. The transverse magnetization is a vector. Its x and y magnetization components are carried by separate scalar fluids. There is a set of coarse grained distribution functions for each fluid. Radio frequency magnetic fields, internal magnetic field gradients, applied magnetic field gradient pulses, etc., represent conversion processes in which the two fluids transform into one another. Two examples, one <span class="hlt">involving</span> a periodic field gradient and a Hahn echo, and the other <span class="hlt">involving</span> an isolated pore and a PFG sequence, are examined in detail.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2015AGUFM.H41C1325C&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2015AGUFM.H41C1325C&link_type=ABSTRACT"><span id="translatedtitle">Comparison of the Shan-Chen and Color-Fluid Models in Lattice Boltzmann Simulation of Two-Phase Flow in <span class="hlt">Porous</span> Media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chen, Y.; Valocchi, A. J.; Kohanpur, A. H.; Freiburg, J. T.</p> <p>2015-12-01</p> <p>Direct numerical simulation of multiphase flow in <span class="hlt">porous</span> media is an important tool for understanding pore-scale processes affecting transport and fate of supercritical CO2 in saline reservoirs. The lattice Boltzmann method, based on microscopic models and mesoscopic kinetic equations, is particularly well suited for fluid flow simulations <span class="hlt">involving</span> interfacial dynamics and complex boundaries. In this study, we compare the Shan-Chen and color-fluid model in lattice Boltzmann simulation of multiphase flow in <span class="hlt">porous</span> media. The original models were proposed two decades ago, and suffer from significant spurious currents as well as other numerical limitations. Therefore, the latest developments of the two models are employed, which allows consideration of density and viscosity contrasts relevant to geological sequestration in saline reservoirs. Previous studies of the comparison of the two models were mostly done in simple geometries, and demonstrated that the Shan-Chen model suffered from more serious numerical errors than the color-fluid model, although the latter is more computationally demanding. The real <span class="hlt">impact</span> on multiphase flow in <span class="hlt">porous</span> media has not been studied in detail. In this investigation, we employ realistic fluid parameters and perform numerical simulations in geometries based on micro-CT images of rock cores. The fluid displacement patterns and the relative permeability obtained by simulations will be used to evaluate the two models. The computational cost of the two models will also be presented for comparison. This work was supported as part of the Center for Geologic Storage of CO2, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3506525','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3506525"><span id="translatedtitle">Nanostructures formed by displacement of <span class="hlt">porous</span> silicon with copper: from nanoparticles to <span class="hlt">porous</span> membranes</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p></p> <p>2012-01-01</p> <p>The application of <span class="hlt">porous</span> silicon as a template for the fabrication of nanosized copper objects is reported. Three different types of nanostructures were formed by displacement deposition of copper on <span class="hlt">porous</span> silicon from hydrofluoric acid-based solutions of copper sulphate: (1) copper nanoparticles, (2) quasi-continuous copper films, and (3) free <span class="hlt">porous</span> copper membranes. Managing the parameters of <span class="hlt">porous</span> silicon (pore sizes, porosity), deposition time, and wettability of the copper sulphate solution has allowed to achieve such variety of the copper structures. Elemental and structural analyses of the obtained structures are presented. Young modulus measurements of the <span class="hlt">porous</span> copper membrane have been carried out and its modest activity in surface enhanced Raman spectroscopy is declared. PMID:22916840</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/20849094','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/20849094"><span id="translatedtitle">Direct imprinting of <span class="hlt">porous</span> substrates: a rapid and low-cost approach for patterning <span class="hlt">porous</span> nanomaterials.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ryckman, Judson D; Liscidini, Marco; Sipe, J E; Weiss, S M</p> <p>2011-05-11</p> <p>This work describes a technique for one-step, direct patterning of <span class="hlt">porous</span> nanomaterials, including insulators, semiconductors, and metals without the need for intermediate polymer processing or dry etching steps. Our process, which we call "direct imprinting of <span class="hlt">porous</span> substrates (DIPS)", utilizes reusable stamps with micro- and nanoscale features that are applied directly to a <span class="hlt">porous</span> material to selectively compress or crush the <span class="hlt">porous</span> network. The stamp pattern is transferred to the <span class="hlt">porous</span> material with high fidelity, vertical resolution below 5 nm, and lateral resolution below 100 nm. The process is performed in less than one minute at room temperature and at standard atmospheric pressure. We have demonstrated structures ranging from subwavelength optical components to microparticles and present exciting avenues for applications including surface-enhanced Raman spectroscopy (SERS), label-free biosensors, and drug delivery. PMID:20849094</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25656560','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25656560"><span id="translatedtitle">From <span class="hlt">porous</span> gold nanocups to <span class="hlt">porous</span> nanospheres and solid particles--a new synthetic approach.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ihsan, Ayesha; Katsiev, Habib; Alyami, Noktan; Anjum, Dalaver H; Khan, Waheed S; Hussain, Irshad</p> <p>2015-05-15</p> <p>We report a versatile approach for the synthesis of <span class="hlt">porous</span> gold nanocups, <span class="hlt">porous</span> gold nanospheres and solid gold nanoparticles. Gold nanocups are formed by the slow reduction of gold salt (HAuCl4⋅3H2O) using aminoantipyrene (AAP) as a reducing agent. Adding polyvinylpyrrolidone (PVP) to the gold salt followed by reduction with AAP resulted in the formation of <span class="hlt">porous</span> gold nanospheres. Microwave irradiation of both of these <span class="hlt">porous</span> gold particles resulted in the formation of slightly smaller but solid gold particles. All these nanoparticles are thoroughly characterized by UV-visible spectroscopy, scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM) and bright-field tomography. Due to the larger size, <span class="hlt">porous</span> nature, low density and higher surface area, these nanomaterials may have interesting applications in catalysis, drug delivery, phototherapy and sensing. PMID:25656560</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2006PhRvE..74c1801B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2006PhRvE..74c1801B"><span id="translatedtitle">Entropy-induced separation of star polymers in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Blavats'Ka, V.; von Ferber, C.; Holovatch, Yu.</p> <p>2006-09-01</p> <p>We present a quantitative picture of the separation of star polymers in a solution where part of the volume is influenced by a <span class="hlt">porous</span> medium. To this end, we study the <span class="hlt">impact</span> of long-range-correlated quenched disorder on the entropy and scaling properties of f -arm star polymers in a good solvent. We assume that the disorder is correlated on the polymer length scale with a power-law decay of the pair correlation function g(r)˜r-a . Applying the field-theoretical renormalization group approach we show in a double expansion in ɛ=4-d and δ=4-a that there is a range of correlation strengths δ for which the disorder changes the scaling behavior of star polymers. In a second approach we calculate for fixed space dimension d=3 and different values of the correlation parameter a the corresponding scaling exponents γf that govern entropic effects. We find that γf-1 , the deviation of γf from its mean field value is amplified by the disorder once we increase δ beyond a threshold. The consequences for a solution of diluted chain and star polymers of equal molecular weight inside a <span class="hlt">porous</span> medium are that star polymers exert a higher osmotic pressure than chain polymers and in general higher branched star polymers are expelled more strongly from the correlated <span class="hlt">porous</span> medium. Surprisingly, polymer chains will prefer a stronger correlated medium to a less or uncorrelated medium of the same density while the opposite is the case for star polymers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21072297','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21072297"><span id="translatedtitle">Entropy-induced separation of star polymers in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Blavats'ka, V.; Ferber, C. von; Holovatch, Yu.</p> <p>2006-09-15</p> <p>We present a quantitative picture of the separation of star polymers in a solution where part of the volume is influenced by a <span class="hlt">porous</span> medium. To this end, we study the <span class="hlt">impact</span> of long-range-correlated quenched disorder on the entropy and scaling properties of f-arm star polymers in a good solvent. We assume that the disorder is correlated on the polymer length scale with a power-law decay of the pair correlation function g(r){approx}r{sup -a}. Applying the field-theoretical renormalization group approach we show in a double expansion in {epsilon}=4-d and {delta}=4-a that there is a range of correlation strengths {delta} for which the disorder changes the scaling behavior of star polymers. In a second approach we calculate for fixed space dimension d=3 and different values of the correlation parameter a the corresponding scaling exponents {gamma}{sub f} that govern entropic effects. We find that {gamma}{sub f}-1, the deviation of {gamma}{sub f} from its mean field value is amplified by the disorder once we increase {delta} beyond a threshold. The consequences for a solution of diluted chain and star polymers of equal molecular weight inside a <span class="hlt">porous</span> medium are that star polymers exert a higher osmotic pressure than chain polymers and in general higher branched star polymers are expelled more strongly from the correlated <span class="hlt">porous</span> medium. Surprisingly, polymer chains will prefer a stronger correlated medium to a less or uncorrelated medium of the same density while the opposite is the case for star polymers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25047379','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25047379"><span id="translatedtitle">Tools, harmonization and standardization procedures of the <span class="hlt">impact</span> and outcome evaluation indices obtained during a kindergarten-based, family-<span class="hlt">involved</span> intervention to prevent obesity in early childhood: the ToyBox-study.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Mouratidou, T; Miguel, M L; Androutsos, O; Manios, Y; De Bourdeaudhuij, I; Cardon, G; Kulaga, Z; Socha, P; Galcheva, S; Iotova, V; Payr, A; Koletzko, B; Moreno, L A</p> <p>2014-08-01</p> <p>The ToyBox-intervention is a kindergarten-based, family-<span class="hlt">involved</span> intervention targeting multiple lifestyle behaviours in preschool children, their teachers and their families. This intervention was conducted in six European countries, namely Belgium, Bulgaria, Germany, Greece, Poland and Spain. The aim of this paper is to provide a descriptive overview of the harmonization and standardization procedures of the baseline and follow-up evaluation of the study (and substudies). Steps related to the study's operational, standardization and harmonization procedures as well as the <span class="hlt">impact</span> and outcome evaluation assessment tools used are presented. Experiences from the project highlight the importance of safeguarding the measurement process to minimize data heterogeneity derived from potential measurement error and country-by-country differences. In addition, it was made clear that continuing quality control and support is an important component of such studies. For this reason, well-supported communication channels, such as regular email updates and teleconferences, and regular internal and external meetings to ensure smooth and accurate implementation were in place during the study. The ToyBox-intervention and its harmonized and standardized procedures can serve as a successful case study for future studies evaluating the efficacy of similar interventions. PMID:25047379</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/92962','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/92962"><span id="translatedtitle">Analysis of forging limit for sintered <span class="hlt">porous</span> metals</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Han, H.N.; Oh, K.H.; Lee, D.N.</p> <p>1995-06-15</p> <p>Forging of sintered <span class="hlt">porous</span> metals has been developed as a method for producing machine parts with good mechanical properties. To extend this manufacturing method to a wide range of applications, it will be helpful to have an understanding of the deformation, density change and fracture of sintered <span class="hlt">porous</span> metals during forging. Especially, in order to avoid the possibility of surface fracture in forging of <span class="hlt">porous</span> metals, it is necessary to know the forging limits of sintered <span class="hlt">porous</span> metals. The purpose of this work is to calculate the forging limit curves of sintered <span class="hlt">porous</span> metals using the various yield functions for <span class="hlt">porous</span> metals.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/11909255','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/11909255"><span id="translatedtitle">Lattice Boltzmann simulation of chemical dissolution in <span class="hlt">porous</span> media.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kang, Qinjun; Zhang, Dongxiao; Chen, Shiyi; He, Xiaoyi</p> <p>2002-03-01</p> <p>In this paper, we develop a lattice Boltzmann model for simulating the transport and reaction of fluids in <span class="hlt">porous</span> media. To simulate such a system, we account for the interaction of forced convection, molecular diffusion, and surface reaction. The problem is complicated by the evolution of the <span class="hlt">porous</span> media geometry due to chemical reactions, which may significantly and continuously modify the hydrologic properties of the media. The particular application that motivates the present study is acid stimulation, a common technique used to increase production from petroleum reservoirs. This technique <span class="hlt">involves</span> the injection of acid (e.g., hydrochloric acid, HCl, acetic acid, HAc) into the formation to dissolve minerals comprising the rock. As acid is injected, highly conductive channels or "wormholes" may be formed. The dissolution of carbonate rocks in 0.5M HCl and 0.5M HAc is simulated with the lattice Boltzmann model developed in this study. The dependence of dissolution process and the geometry of the final wormhole pattern on the acid type and the injection rate is studied. The results agree qualitatively with the experimental and theoretical analyses of others and substantiate the previous finding that there exists an optimal injection rate at which the wormhole is formed as well as the number of pore volumes of the injected fluid to break through is minimized. This study also confirms the experimentally observed phenomenon that the optimal injection rate decreases and the corresponding minimized number of pore volumes to break through increases as the acid is changed from HCl to HAc. Simulations suggest that the proposed lattice Boltzmann model may serve as an alternative reliable quantitative approach to study chemical dissolution in <span class="hlt">porous</span> media. PMID:11909255</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26212784','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26212784"><span id="translatedtitle">Numerical investigation of nanoparticles transport in anisotropic <span class="hlt">porous</span> media.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Salama, Amgad; Negara, Ardiansyah; El Amin, Mohamed; Sun, Shuyu</p> <p>2015-10-01</p> <p>In this work the problem related to the transport of nanoparticles in anisotropic <span class="hlt">porous</span> media is investigated numerically using the multipoint flux approximation. Anisotropy of <span class="hlt">porous</span> media properties is an essential feature that exists almost everywhere in subsurface formations. In anisotropic media, the flux and the pressure gradient vectors are no longer collinear and therefore interesting patterns emerge. The transport of nanoparticles in subsurface formations is affected by several complex processes including surface charges, heterogeneity of nanoparticles and soil grain collectors, interfacial dynamics of double-layer and many others. We use the framework of the theory of filtration in this investigation. Processes like particles deposition, entrapment, as well as detachment are accounted for. From the numerical methods point of view, traditional two-point flux finite difference approximation cannot handle anisotropy of media properties. Therefore, in this work we use the multipoint flux approximation (MPFA). In this technique, the flux components are affected by more neighboring points as opposed to the mere two points that are usually used in traditional finite volume methods. We also use the experimenting pressure field approach which automatically constructs the global system of equations by solving multitude of local problems. This approach facilitates to a large extent the construction of the global system. A set of numerical examples is considered <span class="hlt">involving</span> two-dimensional rectangular domain. A source of nanoparticles is inserted in the middle of the anisotropic layer. We investigate the effects of both anisotropy angle and anisotropy ratio on the transport of nanoparticles in saturated <span class="hlt">porous</span> media. It is found that the concentration plume and porosity contours follow closely the principal direction of anisotropy of permeability of the central domain. PMID:26212784</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010EGUGA..1212036T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010EGUGA..1212036T"><span id="translatedtitle">Faulting in <span class="hlt">porous</span> carbonate grainstones</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tondi, Emanuele; Agosta, Fabrizio</p> <p>2010-05-01</p> <p>In the recent past, a new faulting mechanism has been documented within <span class="hlt">porous</span> carbonate grainstones. This mechanism is due to strain localization into narrow tabular bands characterized by both volumetric and shear strain; for this reason, these features are named compactive shear bands. In the field, compactive shear bands are easily recognizable because they are lightly coloured with respect to the parent rock, and/or show a positive relief because of their increased resistance to weathering. Both characteristics, light colours and positive relief, are a consequence of the compaction processes that characterize these bands, which are the simplest structure element that form within <span class="hlt">porous</span> carbonate grainstones. With ongoing deformation, the single compactive shear bands, which solve only a few mm of displacement, may evolve into zone of compactive shear bands and, finally, into well-developed faults characterized by slip surfaces and fault rocks. Field analysis conducted in key areas of Italy allow us to documented different modalities of interaction and linkage among the compactive shear bands: (i) a simple divergence of two different compactive shear bands from an original one, (ii) extensional and contractional jogs formed by two continuous, interacting compactive shear bands, and (iii) eye structures formed by collinear interacting compactive shear bands, which have been already described for deformation bands in sandstones. The last two types of interaction may localize the formation of compaction bands, which are characterized by pronounced component of compaction and negligible components of shearing, and/or pressure solution seams. All the aforementioned types of interaction and linkage could happen at any deformation stage, single bands, zone of bands or well developed faults. The transition from one deformation process to another, which is likely to be controlled by the changes in the material properties, is recorded by different ratios and</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/6284523','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/6284523"><span id="translatedtitle">Combustion and heat transfer in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Sathe, S.B.; Peck, R.E.; Tong, T.W.</p> <p>1990-06-01</p> <p>The objective of the present study is to generate fundamental knowledge about heat transfer and combustion in <span class="hlt">porous</span> radiant burners (PRBs) in order to improve their performance. A theoretical heat transfer and combustion model is developed to study the characteristics of PRBs. The model accounts for non-local thermal equilibrium between the solid and gas phases. The solid is assumed to absorb, emit and scatter radiant energy. Combustion is modeled as a one-step global reaction. It is revealed that the flame speed inside the <span class="hlt">porous</span> medium is enhanced compared to the adiabatic flame speeds due to the higher conductivity of the solid compared to the gas as well as due to radiative preheating of the reactants. The effects of the properties of the <span class="hlt">porous</span> material on the flame speeds, radiative outputs and efficiencies were investigated. To improve the radiative output from the burner, it is desirable that the <span class="hlt">porous</span> layer has an optical thickness of about ten. The radiative output and the efficiency is higher for lower scattering albedo. The heat transfer coupling between the solid and gas phases should be high enough to ensure local thermal equilibrium, by choosing a fine <span class="hlt">porous</span> matrix. Higher solid phase conduction enhances the flame speed and the radiative output. Experiments are performed on a ceramic foam to verify the theoretical findings. The existence of the two stability regions was verified experimentally.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015EGUGA..17.7867J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015EGUGA..17.7867J"><span id="translatedtitle">Thermo-Hydro-Mechanical Evolution of Transport Properties in <span class="hlt">Porous</span> Media: From Laboratory to the Groß-Schönebeck Geothermal Reservoir.</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Jacquey, Antoine; Cacace, Mauro; Blöcher, Guido; Watanabe, Norihiro; Scheck-Wenderoth, Magadalena</p> <p>2015-04-01</p> <p>Quantifying variations of transport properties of <span class="hlt">porous</span> material, which are porosity and permeability is of special interest for geothermal applications. Variations of these properties result from the coupling between rock deformation and thermal processes. Significant pore pressure and temperature changes can occur during injection and production of fluid. Such changes have a direct <span class="hlt">impact</span> on the stress-field affecting the geothermal reservoir performance. Understanding the coupling between deformation of the <span class="hlt">porous</span> material and variation of its properties for mass and energy transfer is therefore a major focus for any geothermal operations. Deformation of a <span class="hlt">porous</span> material filled with fluid is based on variations of bulk and pore volumes and affects therefore the basic transport properties of the rock. Variations of the transport properties can be expressed by theoretical formulations based on experimental observations and then integrated into numerical models which can be used to predict reservoir performance at the field scale. The aim of this study is to develop a complete poro- and thermoelastic formulation capable of explaining and quantifying fluid-rock interactions in a context of geothermal applications. In a first step, formulations to quantify porosity variations are tested with the open-source finite element method based software OpenGeoSys (Kolditz et al. 2012) and compared to laboratory experiments to constrain the parameters <span class="hlt">involved</span>. Numerical description of the physical phenomena <span class="hlt">involved</span> for such behavior requires to account for the coupling between deformation, thermal and hydraulic processes and the relations between different scales. Three different formulations with H-M coupling are studied which are based on the theories of poroelasticity and crack closure (Zimmerman 1991, Blöcher et al. 2013 and Chin et al. 2000). These three formulations are tested on two different kinds of sandstones (Flechtinger and Bentheimer sandstones) by comparing</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JPS...309...11G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JPS...309...11G"><span id="translatedtitle">Microstructural effects on the average properties in <span class="hlt">porous</span> battery electrodes</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>García-García, Ramiro; García, R. Edwin</p> <p>2016-03-01</p> <p>A theoretical framework is formulated to analytically quantify the effects of the microstructure on the average properties of <span class="hlt">porous</span> electrodes, including reactive area density and the through-thickness tortuosity as observed in experimentally-determined tomographic sections. The proposed formulation includes the microstructural non-idealities but also captures the well-known perfectly spherical limit. Results demonstrate that in the absence of any particle alignment, the through-thickness Bruggeman exponent α, reaches an asymptotic value of α ∼ 2 / 3 as the shape of the particles become increasingly prolate (needle- or fiber-like). In contrast, the Bruggeman exponent diverges as the shape of the particles become increasingly oblate, regardless of the degree of particle alignment. For aligned particles, tortuosity can be dramatically suppressed, e.g., α → 1 / 10 for ra → 1 / 10 and MRD ∼ 40 . Particle size polydispersity <span class="hlt">impacts</span> the porosity-tortuosity relation when the average particle size is comparable to the thickness of the electrode layers. Electrode reactivity density can be arbitrarily increased as the particles become increasingly oblate, but asymptotically reach a minimum value as the particles become increasingly prolate. In the limit of a <span class="hlt">porous</span> electrode comprised of fiber-like particles, the area density decreases by 24% , with respect to a distribution of perfectly spherical particles.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26831681','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26831681"><span id="translatedtitle">Effect of Graphene Oxide on the Properties of <span class="hlt">Porous</span> Silicon.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Olenych, Igor B; Aksimentyeva, Olena I; Monastyrskii, Liubomyr S; Horbenko, Yulia Yu; Partyka, Maryan V; Luchechko, Andriy P; Yarytska, Lidia I</p> <p>2016-12-01</p> <p>We studied an effect of the graphene oxide (GO) layer on the optical and electrical properties of <span class="hlt">porous</span> silicon (PS) in hybrid PS-GO structure created by electrochemical etching of silicon wafer and deposition of GO from water dispersion on PS. With the help of scanning electron microscopy (SEM), atomic-force microscopy (AFM), and Fourier transform infrared (FTIR) spectroscopy, it was established that GO formed a thin film on the PS surface and is partly embedded in the pores of PS. A comparative analysis of the FTIR spectra for the PS and PS-GO structures confirms the passivation of the PS surface by the GO film. This film has a sufficient transparency for excitation and emission of photoluminescence (PL). Moreover, GO modifies PL spectrum of PS, shifting the PL maximum by 25 nm towards lower energies. GO deposition on the surface of the <span class="hlt">porous</span> silicon leads to the change in the electrical parameters of PS in AC and DC modes. By means of current-voltage characteristics (CVC) and impedance spectroscopy, it is shown that the <span class="hlt">impact</span> of GO on electrical characteristics of PS manifests in reduced capacitance and lower internal resistance of hybrid structures. PMID:26831681</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016NRL....11...43O','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016NRL....11...43O"><span id="translatedtitle">Effect of Graphene Oxide on the Properties of <span class="hlt">Porous</span> Silicon</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Olenych, Igor B.; Aksimentyeva, Olena I.; Monastyrskii, Liubomyr S.; Horbenko, Yulia Yu.; Partyka, Maryan V.; Luchechko, Andriy P.; Yarytska, Lidia I.</p> <p>2016-02-01</p> <p>We studied an effect of the graphene oxide (GO) layer on the optical and electrical properties of <span class="hlt">porous</span> silicon (PS) in hybrid PS-GO structure created by electrochemical etching of silicon wafer and deposition of GO from water dispersion on PS. With the help of scanning electron microscopy (SEM), atomic-force microscopy (AFM), and Fourier transform infrared (FTIR) spectroscopy, it was established that GO formed a thin film on the PS surface and is partly embedded in the pores of PS. A comparative analysis of the FTIR spectra for the PS and PS-GO structures confirms the passivation of the PS surface by the GO film. This film has a sufficient transparency for excitation and emission of photoluminescence (PL). Moreover, GO modifies PL spectrum of PS, shifting the PL maximum by 25 nm towards lower energies. GO deposition on the surface of the <span class="hlt">porous</span> silicon leads to the change in the electrical parameters of PS in AC and DC modes. By means of current-voltage characteristics (CVC) and impedance spectroscopy, it is shown that the <span class="hlt">impact</span> of GO on electrical characteristics of PS manifests in reduced capacitance and lower internal resistance of hybrid structures.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26741883','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26741883"><span id="translatedtitle"><span class="hlt">Porous</span> Silicon's Photoactivity in Water: Insights into Environmental Fate.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Moor, Kyle J; Cates, Ezra L; Kim, Jae-Hong</p> <p>2016-01-19</p> <p>Interest in <span class="hlt">porous</span> silicon (pSi) (and, more broadly, silicon nanoparticles (NPs)) has increased along with their concomitant use in various commercial and consumer products, yet little is known about their behavior in the natural environment. In this study, we have investigated the photosensitization, optical, and surface properties of pSi as a function of time in aqueous systems. Samples were prepared via an anodic electrochemical etching procedure, resulting in pSi particles with diameters of ca. 500 nm, composed of a <span class="hlt">porous</span> network of Si nanocrystallites of 2-4 nm. Initially, pSi particles generated significant amounts of (1)O2, yet they rapidly lost much of this ability due to the formation of an oxide layer on the surface, as determined by X-ray photoelectron spectroscopy, which likely prevented further photosensitization events. Addition of natural organic matter (NOM) did not significantly <span class="hlt">impact</span> pSi's photosensitization abilities. The pSi lacked any intrinsic bactericidal properties on Escherichia coli and did not produce enough (1)O2 to considerably affect populations of a model virus, PR772, highlighting its relatively benign nature toward microbial communities. Results from this study suggest that the photoactivity of pSi is unlikely to persist in aqueous systems and that it may instead behave more similarly to silica particles from an environmental perspective. PMID:26741883</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1987ATJHT.109..363B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1987ATJHT.109..363B"><span id="translatedtitle">Natural convection flow and heat transfer between a fluid layer and a <span class="hlt">porous</span> layer inside a rectangular enclosure</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Beckermann, C.; Ramadhyani, S.; Viskanta, R.</p> <p>1987-05-01</p> <p>A numerical and experimental study is performed to analyze the steady-state natural convection fluid flow and heat transfer in a vertical rectangular enclosure that is partially filled with a vertical layer of a fluid-saturated <span class="hlt">porous</span> medium. The flow in the <span class="hlt">porous</span> layer is modeled utilizing the Brinkman-Forchheimer-extended Darcy equations. The numerical model is verified by conducting a number of experiments, with spherical glass beads as the <span class="hlt">porous</span> medium and water and glycerin as the fluids, in rectangular test cells. The agreement between the flow visualization results and temperature measurements and the numerical model is, in general, good. It is found that the amount of fluid penetrating from the fluid region into the <span class="hlt">porous</span> layer depends strongly on the Darcy (Da) and Rayleigh (Ra) numbers. For a relatively low product of Ra x Da, the flow takes place primarily in the fluid layer, and heat transfer in the <span class="hlt">porous</span> layer is by conduction only. On other hand, fluid penetration into a relatively highly permeable <span class="hlt">porous</span> layer has a significant <span class="hlt">impact</span> on the natural convection flow patterns in the entire enclosure.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4770411','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4770411"><span id="translatedtitle">Morphology-dependent Electrochemical Enhancements of <span class="hlt">Porous</span> Carbon as Sensitive Determination Platform for Ascorbic Acid, Dopamine and Uric Acid</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Cheng, Qin; Ji, Liudi; Wu, Kangbing; Zhang, Weikang</p> <p>2016-01-01</p> <p>Using starch as the carbon precursor and different-sized ZnO naoparticles as the hard template, a series of <span class="hlt">porous</span> carbon materials for electrochemical sensing were prepared. Experiments of scanning electron microscopy, transmission electron microscopy and Nitrogen adsorption-desorption isotherms reveal that the particle size of ZnO has big <span class="hlt">impacts</span> on the <span class="hlt">porous</span> morphology and surface area of the resulting carbon materials. Through ultrasonic dispersion of <span class="hlt">porous</span> carbon and subsequent solvent evaporation, different sensing interfaces were constructed on the surface of glassy carbon electrode (GCE). The electrochemical behaviors of ascorbic acid (AA), dopamine (DA) and uric acid (UA) were studied. On the surface of <span class="hlt">porous</span> carbon materials, the accumulation efficiency and electron transfer ability of AA, DA and UA are improved, and consequently their oxidation signals enhance greatly. Moreover, the interface enhancement effects of <span class="hlt">porous</span> carbon are also controlled by the particle size of hard template. The constructed <span class="hlt">porous</span> carbon interface displays strong signal amplification ability and holds great promise in constructing a sensitive platform for the simultaneous determination of AA, DA and UA. PMID:26924080</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li class="active"><span>21</span></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_21 --> <div id="page_22" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li class="active"><span>22</span></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="421"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4483870','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4483870"><span id="translatedtitle">The application of <span class="hlt">porous</span> tantalum cylinder to the repair of comminuted bone defects: a study of rabbit firearm injuries</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Ren, Bo; Zhai, Zhenbo; Guo, Kai; Liu, Yanpu; Hou, Weihuan; Zhu, Qingsheng; Zhu, Jinyu</p> <p>2015-01-01</p> <p>The aim of this study is to investigate the effect of <span class="hlt">porous</span> tantalum material in repair tibial defects caused by firearm injuries in a rabbit model. A multifunctional biological <span class="hlt">impact</span> machine was used to establish a rabbit tibial defect model of firearm injury. <span class="hlt">Porous</span> tantalum rods were processed into a hollow cylinder. Kirschner wires were used for intramedullary fixation. We compared the differences of the bone ingrowth of the <span class="hlt">porous</span> tantalum material by gross observations, X-rays and histological evaluations. The radiographic observations revealed that fibrous tissue covered the material surface after 4 weeks, and periosteal reactions and new bone callus extending materials appeared after 8 weeks. After 16 weeks, the calluses of the firearm injury group were completely wrapped around a <span class="hlt">porous</span> tantalum material. The group with the highest Lane-Sandhu X-rays cores was the firearm injury and tantalum implant group, and the blank control group exhibited the lowest scores. The histological evaluations revealed that the presence of new bone around the biomaterial had grown into the <span class="hlt">porous</span> tantalum. By the 16th week, the areas of bone tissue of the firearm injury group was significant higher than that of non-firearm injury group (P<0.05). The comminuted fractures treated with tantalum cylinders exhibited greater bone ingrowth in the firearm injury group. In conditions of firearm injuries, the <span class="hlt">porous</span> tantalum biomaterial exhibited bone ingrowth that was beneficial to the treatment of bone defects. PMID:26131078</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26924080','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26924080"><span id="translatedtitle">Morphology-dependent Electrochemical Enhancements of <span class="hlt">Porous</span> Carbon as Sensitive Determination Platform for Ascorbic Acid, Dopamine and Uric Acid.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Cheng, Qin; Ji, Liudi; Wu, Kangbing; Zhang, Weikang</p> <p>2016-01-01</p> <p>Using starch as the carbon precursor and different-sized ZnO naoparticles as the hard template, a series of <span class="hlt">porous</span> carbon materials for electrochemical sensing were prepared. Experiments of scanning electron microscopy, transmission electron microscopy and Nitrogen adsorption-desorption isotherms reveal that the particle size of ZnO has big <span class="hlt">impacts</span> on the <span class="hlt">porous</span> morphology and surface area of the resulting carbon materials. Through ultrasonic dispersion of <span class="hlt">porous</span> carbon and subsequent solvent evaporation, different sensing interfaces were constructed on the surface of glassy carbon electrode (GCE). The electrochemical behaviors of ascorbic acid (AA), dopamine (DA) and uric acid (UA) were studied. On the surface of <span class="hlt">porous</span> carbon materials, the accumulation efficiency and electron transfer ability of AA, DA and UA are improved, and consequently their oxidation signals enhance greatly. Moreover, the interface enhancement effects of <span class="hlt">porous</span> carbon are also controlled by the particle size of hard template. The constructed <span class="hlt">porous</span> carbon interface displays strong signal amplification ability and holds great promise in constructing a sensitive platform for the simultaneous determination of AA, DA and UA. PMID:26924080</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016NatSR...622309C&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016NatSR...622309C&link_type=ABSTRACT"><span id="translatedtitle">Morphology-dependent Electrochemical Enhancements of <span class="hlt">Porous</span> Carbon as Sensitive Determination Platform for Ascorbic Acid, Dopamine and Uric Acid</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Cheng, Qin; Ji, Liudi; Wu, Kangbing; Zhang, Weikang</p> <p>2016-02-01</p> <p>Using starch as the carbon precursor and different-sized ZnO naoparticles as the hard template, a series of <span class="hlt">porous</span> carbon materials for electrochemical sensing were prepared. Experiments of scanning electron microscopy, transmission electron microscopy and Nitrogen adsorption-desorption isotherms reveal that the particle size of ZnO has big <span class="hlt">impacts</span> on the <span class="hlt">porous</span> morphology and surface area of the resulting carbon materials. Through ultrasonic dispersion of <span class="hlt">porous</span> carbon and subsequent solvent evaporation, different sensing interfaces were constructed on the surface of glassy carbon electrode (GCE). The electrochemical behaviors of ascorbic acid (AA), dopamine (DA) and uric acid (UA) were studied. On the surface of <span class="hlt">porous</span> carbon materials, the accumulation efficiency and electron transfer ability of AA, DA and UA are improved, and consequently their oxidation signals enhance greatly. Moreover, the interface enhancement effects of <span class="hlt">porous</span> carbon are also controlled by the particle size of hard template. The constructed <span class="hlt">porous</span> carbon interface displays strong signal amplification ability and holds great promise in constructing a sensitive platform for the simultaneous determination of AA, DA and UA.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/867359','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/867359"><span id="translatedtitle">Joining of <span class="hlt">porous</span> silicon carbide bodies</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Bates, Carl H.; Couhig, John T.; Pelletier, Paul J.</p> <p>1990-05-01</p> <p>A method of joining two <span class="hlt">porous</span> bodies of silicon carbide is disclosed. It entails utilizing an aqueous slip of a similar silicon carbide as was used to form the <span class="hlt">porous</span> bodies, including the sintering aids, and a binder to initially join the <span class="hlt">porous</span> bodies together. Then the composite structure is subjected to cold isostatic pressing to form a joint having good handling strength. Then the composite structure is subjected to pressureless sintering to form the final strong bond. Optionally, after the sintering the structure is subjected to hot isostatic pressing to further improve the joint and densify the structure. The result is a composite structure in which the joint is almost indistinguishable from the silicon carbide pieces which it joins.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/442757','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/442757"><span id="translatedtitle">Numerical study of <span class="hlt">porous</span> media thermoelectric converter</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kosaka, Kenichirou; Yamada, Akira</p> <p>1996-12-31</p> <p>Thermoelectric conversion is direct conversion technology that has characteristics of being maintenance free. However, the efficiency of the conventional bulk semiconductor thermoelectric device is about 20% for ideal theoretical calculation, and less than 5% for an actual application. The efficiency is very low because the heat conduction in the device and the Joule loss are too large compared with the Peltier heat which is changed into the electric power. The thermoelectric device made by <span class="hlt">porous</span> media is heated by the radiation and maintains a large temperature difference by the gas which passes in the <span class="hlt">porous</span> device. Therefore, the influence of the heat conduction in the thermoelectric device is small and the improvement of the conversion efficiency can be attempted. In this paper, the authors report the calculated results and the performance of thermoelectric converter made with <span class="hlt">porous</span> media.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015EPJST.224.2949R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015EPJST.224.2949R"><span id="translatedtitle"><span class="hlt">Porous</span> ferroelectrics for energy harvesting applications</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Roscow, J.; Zhang, Y.; Taylor, J.; Bowen, C. R.</p> <p>2015-11-01</p> <p>This paper provides an overview of energy harvesting using ferroelectric materials, with a particular focus on the energy harvesting capabilities of <span class="hlt">porous</span> ferroelectric ceramics for both piezo- and pyroelectric harvesting. The benefits of introducing porosity into ferro- electrics such as lead zirconate titanate (PZT) has been known for over 30 years, but the potential advantages for energy harvesting from both ambient vibrations and temperature fluctuations have not been studied in depth. The article briefly discusses piezoelectric and pyro- electric energy harvesting, before evaluating the potential benefits of <span class="hlt">porous</span> materials for increasing energy harvesting figures of merits and electromechanical/electrothermal coupling factors. Established processing routes are evaluated in terms of the final <span class="hlt">porous</span> structure and the resulting effects on the electrical, thermal and mechanical properties.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ZaMP...58..646S&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ZaMP...58..646S&link_type=ABSTRACT"><span id="translatedtitle">Flow past a <span class="hlt">porous</span> approximate spherical shell</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Srinivasacharya, D.</p> <p>2007-07-01</p> <p>In this paper, the creeping flow of an incompressible viscous liquid past a <span class="hlt">porous</span> approximate spherical shell is considered. The flow in the free fluid region outside the shell and in the cavity region of the shell is governed by the Navier Stokes equation. The flow within the <span class="hlt">porous</span> annulus region of the shell is governed by Darcy’s Law. The boundary conditions used at the interface are continuity of the normal velocity, continuity of the pressure and Beavers and Joseph slip condition. An exact solution for the problem is obtained. An expression for the drag on the <span class="hlt">porous</span> approximate spherical shell is obtained. The drag experienced by the shell is evaluated numerically for several values of the parameters governing the flow.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015CQGra..32v4010W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015CQGra..32v4010W"><span id="translatedtitle"><span class="hlt">Porous</span> plug for Gravity Probe B</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wang, Suwen; Everitt, C. W. Francis; Frank, David J.; Lipa, John A.; Muhlfelder, Barry F.</p> <p>2015-11-01</p> <p>The confinement of superfluid helium for a Dewar in space poses a unique challenge due to its propensity to minimize thermal gradients by essentially viscous-free counterflow. This poses the risk of losing liquid through a vent pipe, reducing the efficiency of the cooling process. To confine the liquid helium in the Gravity Probe B (GP-B) flight Dewar, a <span class="hlt">porous</span> plug technique was invented at Stanford University. Here, we review the history of the <span class="hlt">porous</span> plug and its development, and describe the physics underlying its operation. We summarize a few missions that employed <span class="hlt">porous</span> plugs, some of which preceded the launch of GP-B. The design, manufacture and flight performance of the GP-B plug are described, and its use resulted in the successful operation of the 2441 l flight Dewar on-orbit for 17.3 months.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016EJPh...37e5102C&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016EJPh...37e5102C&link_type=ABSTRACT"><span id="translatedtitle">Fluid dynamics in <span class="hlt">porous</span> media with Sailfish</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Coelho, Rodrigo C. V.; Neumann, Rodrigo F.</p> <p>2016-09-01</p> <p>In this work we show the application of Sailfish to the study of fluid dynamics in <span class="hlt">porous</span> media. Sailfish is an open-source software based on the lattice-Boltzmann method. This application of computational fluid dynamics is of particular interest to the oil and gas industry and the subject could be a starting point for an undergraduate or graduate student in physics or engineering. We built artificial samples of <span class="hlt">porous</span> media with different porosities and used Sailfish to simulate the fluid flow through them in order to calculate their permeability and tortuosity. We also present a simple way to obtain the specific superficial area of <span class="hlt">porous</span> media using Python libraries. To contextualise these concepts, we analyse the applicability of the Kozeny–Carman equation, which is a well-known permeability–porosity relation, to our artificial samples.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016AIPC.1728b0547A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016AIPC.1728b0547A"><span id="translatedtitle">Investigation of heat transfer in <span class="hlt">porous</span> duct</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Athani, Abdulgaphur; Khan, T. M. Yunus</p> <p>2016-05-01</p> <p>Investigation of heat transfer in a square <span class="hlt">porous</span> duct is carried out. The <span class="hlt">porous</span> medium is sandwiched between inner and outer surface of a square duct. The flow is assumed to follow the Darcy law. The governing momentum and energy equations are non-dimensionalised and then converted to algebraic form of equations using finite element method. Galerkin method is used to transform the partial differential equations into simpler algebraic equations then solved in a iterative manner to arrive at the solution. The results are presented with respect to various geometric and physical parameters such as depth of <span class="hlt">porous</span> medium, Rayleigh number etc. It is found that the isotherms and the streamlines take symmetrical position along the vertical central line of square duct. The isotherms are penetrated into deeper area at upper half of duct as compared to lower half.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/16023197','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/16023197"><span id="translatedtitle">Gas foamed open <span class="hlt">porous</span> biodegradable polymeric microspheres.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kim, Taek Kyoung; Yoon, Jun Jin; Lee, Doo Sung; Park, Tae Gwan</p> <p>2006-01-01</p> <p>Highly open <span class="hlt">porous</span> biodegradable polymeric microspheres were fabricated for use as injectable scaffold microcarriers for cell delivery. A modified water-in-oil-in-water (W1/O/W2) double emulsion solvent evaporation method was employed for producing the microspheres. The incorporation of an effervescent salt, ammonium bicarbonate, in the primary W1 droplets spontaneously produced carbon dioxide and ammonia gas bubbles during the solvent evaporation process, which not only stabilized the primary emulsion, but also created well inter-connected pores in the resultant microspheres. The <span class="hlt">porous</span> microspheres fabricated under various gas foaming conditions were characterized. The surface pores became as large as 20 microm in diameter with increasing the concentration of ammonium bicarbonate, being sufficient enough for cell infiltration and seeding. These <span class="hlt">porous</span> scaffold microspheres could be potentially utilized for cultivating cells in a suspension manner and for delivering the seeded cells to the tissue defect site in an injectable manner. PMID:16023197</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/24411349','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/24411349"><span id="translatedtitle">Hydroxyapatite-silver nanoparticles coatings on <span class="hlt">porous</span> polyurethane scaffold.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ciobanu, Gabriela; Ilisei, Simona; Luca, Constantin</p> <p>2014-02-01</p> <p>The present paper is focused on a study regarding the possibility of obtaining hydroxyapatite-silver nanoparticle coatings on <span class="hlt">porous</span> polyurethane scaffold. The method applied is based on a combined strategy <span class="hlt">involving</span> hydroxyapatite biomimetic deposition on polyurethane surface using a Supersaturated Calcification Solution (SCS), combined with silver ions reduction and in-situ crystallization processes on hydroxyapatite-polyurethane surface by sample immersing in AgNO3 solution. The morphology, composition and phase structure of the prepared samples were characterized by scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDX), X-ray diffraction (XRD), UV-Vis spectroscopy and X-ray photoelectron spectroscopy (XPS) measurements. The data obtained show that a layer of hydroxyapatite was deposited on <span class="hlt">porous</span> polyurethane support and the silver nanoparticles (average size 34.71 nm) were dispersed among and even on the hydroxyapatite crystals. Hydroxyapatite/polyurethane surface acts as a reducer and a stabilizing agent for silver ions. The surface plasmon resonance peak in UV-Vis absorption spectra showed an absorption maximum at 415 nm, indicating formation of silver nanoparticles. The hydroxyapatite-silver polyurethane scaffolds were tested against Staphylococcus aureus and Escherichia coli and the obtained data were indicative of good antibacterial properties of the materials. PMID:24411349</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/15005278','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/15005278"><span id="translatedtitle">Synthesis and characterization of <span class="hlt">porous</span> hydroxyapatite and hydroxyapatite coatings</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Nieh, T G; Choi, B W; Jankowski, A F</p> <p>2000-10-25</p> <p>A technique is developed to construct bulk hydroxyapatite (HAp) with different cellular structures. The technique <span class="hlt">involves</span> the initial synthesis of nanocrystalline hydroxyapatite powder from an aqueous solution using water-soluble compounds and then followed by spray drying into agglomerated granules. The granules were further cold pressed and sintered into bulks at elevated temperatures. The sintering behavior of the HAp granules was characterized and compared with those previously reported. Resulting from the fact that the starting HAp powders were extremely fine, a relatively low activation energy for sintering was obtained. In the present study, both <span class="hlt">porous</span> and dense structures were produced by varying powder morphology and sintering parameters. <span class="hlt">Porous</span> structures consisting of open cells were constructed. Sintered structures were characterized using scanning electron microscopy and x-ray tomography. In the present paper, hydroxyapatite coatings produced by magnetron sputtering on silicon and titanium substrates will also be presented. The mechanical properties of the coatings were measured using nanoindentation techniques and microstructures examined using transmission electron microscopy.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012Nanot..23D5705M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012Nanot..23D5705M"><span id="translatedtitle">Ultrafast excited state deactivation of doped <span class="hlt">porous</span> anodic alumina membranes</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Makhal, Abhinandan; Sarkar, Soumik; Pal, Samir Kumar; Yan, Hongdan; Wulferding, Dirk; Cetin, Fatih; Lemmens, Peter</p> <p>2012-08-01</p> <p>Free-standing, bi-directionally permeable and ultra-thin anodic aluminum oxide (AAO) membranes establish attractive templates (host) for the synthesis of nano-dots and rods of various materials (guest). This is due to their chemical and structural integrity and high periodicity on length scales of 5-150 nm which are often used to host photoactive nano-materials for various device applications including dye-sensitized solar cells. In the present study, AAO membranes are synthesized by using electrochemical methods and a detailed structural characterization using FEG-SEM, XRD and TGA confirms the porosity and purity of the material. Defect-mediated photoluminescence quenching of the <span class="hlt">porous</span> AAO membrane in the presence of an electron accepting guest organic molecule (benzoquinone) is studied by means of steady-state and picosecond/femtosecond-resolved luminescence measurements. Using time-resolved luminescence transients, we have also revealed light harvesting of complexes of <span class="hlt">porous</span> alumina impregnated with inorganic quantum dots (Maple Red) or gold nanowires. Both the Förster resonance energy transfer and the nano-surface energy transfer techniques are employed to examine the observed quenching behavior as a function of the characteristic donor-acceptor distances. The experimental results will find their relevance in light harvesting devices based on AAOs combined with other materials <span class="hlt">involving</span> a decisive energy/charge transfer dynamics.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=39233&keyword=computer+AND+science+AND+history&actType=&TIMSType=+&TIMSSubTypeID=&DEID=&epaNumber=&ntisID=&archiveStatus=Both&ombCat=Any&dateBeginCreated=&dateEndCreated=&dateBeginPublishedPresented=&dateEndPublishedPresented=&dateBeginUpdated=&dateEndUpdated=&dateBeginCompleted=&dateEndCompleted=&personID=&role=Any&journalID=&publisherID=&sortBy=revisionDate&count=50&CFID=75569465&CFTOKEN=86386694','EPA-EIMS'); return false;" href="http://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=39233&keyword=computer+AND+science+AND+history&actType=&TIMSType=+&TIMSSubTypeID=&DEID=&epaNumber=&ntisID=&archiveStatus=Both&ombCat=Any&dateBeginCreated=&dateEndCreated=&dateBeginPublishedPresented=&dateEndPublishedPresented=&dateBeginUpdated=&dateEndUpdated=&dateBeginCompleted=&dateEndCompleted=&personID=&role=Any&journalID=&publisherID=&sortBy=revisionDate&count=50&CFID=75569465&CFTOKEN=86386694"><span id="translatedtitle"><span class="hlt">POROUS</span> PAVEMENT. PHASE I. DESIGN AND OPERATIONAL CRITERIA</span></a></p> <p><a target="_blank" href="http://oaspub.epa.gov/eims/query.page">EPA Science Inventory</a></p> <p></p> <p></p> <p>Design and operational criteria, utilization concepts, benefits and disadvantages, as well as other characteristics of <span class="hlt">porous</span> pavements are presented in this report. Particular emphasis is placed on <span class="hlt">porous</span> asphalt pavements, but the criteria and design approach are applicable to ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/22213663','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/22213663"><span id="translatedtitle">Explosion propagation in inert <span class="hlt">porous</span> media.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ciccarelli, G</p> <p>2012-02-13</p> <p><span class="hlt">Porous</span> media are often used in flame arresters because of the high surface area to volume ratio that is required for flame quenching. However, if the flame is not quenched, the flow obstruction within the <span class="hlt">porous</span> media can promote explosion escalation, which is a well-known phenomenon in obstacle-laden channels. There are many parallels between explosion propagation through <span class="hlt">porous</span> media and obstacle-laden channels. In both cases, the obstructions play a duel role. On the one hand, the obstruction enhances explosion propagation through an early shear-driven turbulence production mechanism and then later by shock-flame interactions that occur from lead shock reflections. On the other hand, the presence of an obstruction can suppress explosion propagation through momentum and heat losses, which both impede the unburned gas flow and extract energy from the expanding combustion products. In obstacle-laden channels, there are well-defined propagation regimes that are easily distinguished by abrupt changes in velocity. In <span class="hlt">porous</span> media, the propagation regimes are not as distinguishable. In <span class="hlt">porous</span> media the entire flamefront is affected, and the effects of heat loss, turbulence and compressibility are smoothly blended over most of the propagation velocity range. At low subsonic propagation speeds, heat loss to the <span class="hlt">porous</span> media dominates, whereas at higher supersonic speeds turbulence and compressibility are important. This blending of the important phenomena results in no clear transition in propagation mechanism that is characterized by an abrupt change in propagation velocity. This is especially true for propagation velocities above the speed of sound where many experiments performed with fuel-air mixtures show a smooth increase in the propagation velocity with mixture reactivity up to the theoretical detonation wave velocity. PMID:22213663</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26920663','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26920663"><span id="translatedtitle">Synthesis, characterization, and evaluation of a superficially <span class="hlt">porous</span> particle with unique, elongated pore channels normal to the surface.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wei, Ta-Chen; Mack, Anne; Chen, Wu; Liu, Jia; Dittmann, Monika; Wang, Xiaoli; Barber, William E</p> <p>2016-04-01</p> <p>In recent years, superficially <span class="hlt">porous</span> particles (SPPs) have drawn great interest because of their special particle characteristics and improvement in separation efficiency. Superficially <span class="hlt">porous</span> particles are currently manufactured by adding silica nanoparticles onto solid cores using either a multistep multilayer process or one-step coacervation process. The pore size is mainly controlled by the size of the silica nanoparticles and the tortuous pore channel geometry is determined by how those nanoparticles randomly aggregate. Such tortuous pore structure is also similar to that of all totally <span class="hlt">porous</span> particles used in HPLC today. In this article, we report on the development of a next generation superficially <span class="hlt">porous</span> particle with a unique pore structure that includes a thinner shell thickness and ordered pore channels oriented normal to the particle surface. The method of making the new superficially <span class="hlt">porous</span> particles is a process called pseudomorphic transformation (PMT), which is a form of micelle templating. Porosity is no longer controlled by randomly aggregated nanoparticles but rather by micelles that have an ordered liquid crystal structure. The new particle possesses many advantages such as a narrower particle size distribution, thinner <span class="hlt">porous</span> layer with high surface area and, most importantly, highly ordered, non-tortuous pore channels oriented normal to the particle surface. This PMT process has been applied to make 1.8-5.1μm SPPs with pore size controlled around 75Å and surface area around 100m(2)/g. All particles with different sizes show the same unique pore structure with tunable pore size and shell thickness. The <span class="hlt">impact</span> of the novel pore structure on the performance of these particles is characterized by measuring van Deemter curves and constructing kinetic plots. Reduced plate heights as low as 1.0 have been achieved on conventional LC instruments. This indicates higher efficiency of such particles compared to conventional totally <span class="hlt">porous</span> and</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014JCHyd.166...23G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014JCHyd.166...23G"><span id="translatedtitle">Guar gum solutions for improved delivery of iron particles in <span class="hlt">porous</span> media (Part 1): <span class="hlt">Porous</span> medium rheology and guar gum-induced clogging</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gastone, Francesca; Tosco, Tiziana; Sethi, Rajandrea</p> <p>2014-10-01</p> <p>The present work is the first part of a comprehensive study on the use of guar gum to improve delivery of microscale zero-valent iron particles in contaminated aquifers. Guar gum solutions exhibit peculiar shear thinning properties, with high viscosity in static conditions and lower viscosity in dynamic conditions: this is beneficial both for the storage of MZVI dispersions, and also for the injection in <span class="hlt">porous</span> media. In the present paper, the processes associated with guar gum injection in <span class="hlt">porous</span> media are studied performing single-step and multi-step filtration tests in sand-packed columns. The experimental results of single-step tests performed by injecting guar gum solutions prepared at several concentrations and applying different dissolution procedures evidenced that the presence of residual undissolved polymeric particles in the guar gum solution may have a relevant negative <span class="hlt">impact</span> on the permeability of the <span class="hlt">porous</span> medium, resulting in evident clogging. The most effective preparation procedure which minimizes the presence of residual particles is dissolution in warm water (60 °C) followed by centrifugation (procedure T60C). The multi-step tests (i.e. injection of guar gum at constant concentration with a step increase of flow velocity), performed at three polymer concentrations (1.5, 3 and 4 g/l) provided information on the rheological properties of guar gum solutions when flowing through a <span class="hlt">porous</span> medium at variable discharge rates, which mimic the injection in radial geometry. An experimental protocol was defined for the rheological characterization of the fluids in <span class="hlt">porous</span> media, and empirical relationships were derived for the quantification of rheological properties and clogging with variable injection rate. These relationships will be implemented in the second companion paper (Part II) in a radial transport model for the simulation of large-scale injection of MZVI-guar gum slurries.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25065767','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25065767"><span id="translatedtitle">Guar gum solutions for improved delivery of iron particles in <span class="hlt">porous</span> media (part 1): <span class="hlt">porous</span> medium rheology and guar gum-induced clogging.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Gastone, Francesca; Tosco, Tiziana; Sethi, Rajandrea</p> <p>2014-10-01</p> <p>The present work is the first part of a comprehensive study on the use of guar gum to improve delivery of microscale zero-valent iron particles in contaminated aquifers. Guar gum solutions exhibit peculiar shear thinning properties, with high viscosity in static conditions and lower viscosity in dynamic conditions: this is beneficial both for the storage of MZVI dispersions, and also for the injection in <span class="hlt">porous</span> media. In the present paper, the processes associated with guar gum injection in <span class="hlt">porous</span> media are studied performing single-step and multi-step filtration tests in sand-packed columns. The experimental results of single-step tests performed by injecting guar gum solutions prepared at several concentrations and applying different dissolution procedures evidenced that the presence of residual undissolved polymeric particles in the guar gum solution may have a relevant negative <span class="hlt">impact</span> on the permeability of the <span class="hlt">porous</span> medium, resulting in evident clogging. The most effective preparation procedure which minimizes the presence of residual particles is dissolution in warm water (60°C) followed by centrifugation (procedure T60C). The multi-step tests (i.e. injection of guar gum at constant concentration with a step increase of flow velocity), performed at three polymer concentrations (1.5, 3 and 4g/l) provided information on the rheological properties of guar gum solutions when flowing through a <span class="hlt">porous</span> medium at variable discharge rates, which mimic the injection in radial geometry. An experimental protocol was defined for the rheological characterization of the fluids in <span class="hlt">porous</span> media, and empirical relationships were derived for the quantification of rheological properties and clogging with variable injection rate. These relationships will be implemented in the second companion paper (Part II) in a radial transport model for the simulation of large-scale injection of MZVI-guar gum slurries. PMID:25065767</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1230132','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/1230132"><span id="translatedtitle">Nonisothermal Two-Phase <span class="hlt">Porous</span> Flow</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p></p> <p>1992-02-21</p> <p>NORIA is a finite element program that simultaneously solves four nonlinear parabolic, partial differential equations that describe the transport of water, water vapor, air, and energy through partially saturated <span class="hlt">porous</span> media. NORIA is designed for the analysis of two-dimensional, non-isothermal, unsaturated <span class="hlt">porous</span> flow problems. Nearly all material properties, such as permeability, can either be set to constant values or defined as functions of the dependent and independent variables by user-supplied subroutines. The gas phase is taken to be ideal. NORIA is intended to solve nonisothermal problems in which large gradients are expected in the gas pressure.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li class="active"><span>22</span></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_22 --> <div id="page_23" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li class="active"><span>23</span></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="441"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4505083','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4505083"><span id="translatedtitle">Nanomechanical humidity detection through <span class="hlt">porous</span> alumina cantilevers</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Klimenko, Alexey; Lebedev, Vasiliy; Lukashin, Alexey; Eliseev, Andrey</p> <p>2015-01-01</p> <p>Summary We present here the behavior of the resonance frequency of <span class="hlt">porous</span> anodic alumina cantilever arrays during water vapor adsorption and emphasize their possible use in the micromechanical sensing of humidity levels at least in the range of 10–22%. The sensitivity of <span class="hlt">porous</span> anodic aluminium oxide cantilevers (Δf/Δm) and the humidity sensitivity equal about 56 Hz/pg and about 100 Hz/%, respectively. The approach presented here for the design of anodic alumina cantilever arrays by the combination of anodic oxidation and photolithography enables easy control over porosity, surface area, geometric and mechanical characteristics of the cantilever arrays for micromechanical sensing. PMID:26199836</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013APS..MARG45007A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013APS..MARG45007A"><span id="translatedtitle">Enhancing Nucleation rates using <span class="hlt">Porous</span> Silica</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Akella, Sathish; Fraden, Seth</p> <p>2013-03-01</p> <p>The role of nucleants in promoting protein crystal nucleation is an on-going field of research. <span class="hlt">Porous</span> silica acts as heterogeneous nucleation centers and enhances nucleation rates. For the protein lysozyme there are multiple polymorphs and we demonstrate that <span class="hlt">porous</span> silica preferentially increases one of the polymorphs. Preliminary studies are presented in which accurate nucleation rates for the different polymorphs as a function of nucleant concentration are obtained through optical microscopy studies of thousands of crystallization trials in identical water-in-oil emulsion drops produced using microfluidics. NSF-IDBR</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/15016596','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/15016596"><span id="translatedtitle">Bounds on Transport Coefficients of <span class="hlt">Porous</span> Media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Berryman, J G</p> <p>2005-03-21</p> <p>An analytical formulation of conductivity bounds by Bergman and Milton is used in a different way to obtain rigorous bounds on the real transport coefficients (electrical conductivity, thermal conductivity, and/or fluid permeability) of a fluid-saturated <span class="hlt">porous</span> medium. These bounds do not depend explicitly on the porosity, but rather on two formation factors--one associated with the pore space and the other with the solid frame. Hashin-Shtrikman bounds for transport in random polycrystals of <span class="hlt">porous</span>-material laminates will also be discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19940000664&hterms=porous+silicon&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dporous%2Bsilicon','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19940000664&hterms=porous+silicon&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dporous%2Bsilicon"><span id="translatedtitle">Making <span class="hlt">Porous</span> Luminescent Regions In Silicon Wafers</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Fathauer, Robert W.; Jones, Eric W.</p> <p>1994-01-01</p> <p>Regions damaged by ion implantation stain-etched. <span class="hlt">Porous</span> regions within single-crystal silicon wafers fabricated by straightforward stain-etching process. Regions exhibit visible photoluminescence at room temperature and might constitute basis of novel class of optoelectronic devices. Stain-etching process has advantages over recently investigated anodic-etching process. Process works on both n-doped and p-doped silicon wafers. Related development reported in article, "<span class="hlt">Porous</span> Si(x)Ge(1-x) Layers Within Single Crystals of Si," (NPO-18836).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016AIPC.1738U0139S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016AIPC.1738U0139S"><span id="translatedtitle">Mixed convection opposing flow in <span class="hlt">porous</span> annulus</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Salman, Ahmed N. J.; Kamangar, Sarfaraz; Al-Rashed, Abdullah A. A. A.; Khan, T. M. Yunus; Khaleed, H. M. T.</p> <p>2016-06-01</p> <p>The current work investigates the mixed convection flow in a vertical <span class="hlt">porous</span> annulus embedded with fluid saturated <span class="hlt">porous</span> medium. The annulus is isothermally heated discretely at 20%, 35% and 50% of the height of cylinder at the center of annulus. Darcy law with thermal non-equilibrium approach is considered. The governing partial differential equations are solved using Finite Element Method (FEM). The effects of Peclet number Pe and conductivity ratio Kr on heat transfer and fluid flow is discussed It is found that the applied velocity in the downward direction, in case of an opposing flow, does not allow the thermal energy to reach from a hot to a cold surface.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1230132-nonisothermal-two-phase-porous-flow','SCIGOV-ESTSC'); return false;" href="http://www.osti.gov/scitech/biblio/1230132-nonisothermal-two-phase-porous-flow"><span id="translatedtitle">Nonisothermal Two-Phase <span class="hlt">Porous</span> Flow</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech/">Energy Science and Technology Software Center (ESTSC)</a></p> <p></p> <p>1992-02-21</p> <p>NORIA is a finite element program that simultaneously solves four nonlinear parabolic, partial differential equations that describe the transport of water, water vapor, air, and energy through partially saturated <span class="hlt">porous</span> media. NORIA is designed for the analysis of two-dimensional, non-isothermal, unsaturated <span class="hlt">porous</span> flow problems. Nearly all material properties, such as permeability, can either be set to constant values or defined as functions of the dependent and independent variables by user-supplied subroutines. The gas phase ismore » taken to be ideal. NORIA is intended to solve nonisothermal problems in which large gradients are expected in the gas pressure.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/929726','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/929726"><span id="translatedtitle"><span class="hlt">Porous</span> ceramic scaffolds with complex architectures</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Saiz, Eduardo; Munch, Etienne; Franco, Jaime; Deville, Sylvain; Hunger, Phillip; Saiz, Eduardo; Tomsia, Antoni P.</p> <p>2008-03-15</p> <p>This work compares two novel techniques for the fabrication of ceramic scaffolds for bone tissue engineering with complex porosity: robocasting and freeze casting. Both techniques are based on the preparation of concentrated ceramic suspensions with suitable properties for the process. In robocasting, the computer-guided deposition of the suspensions is used to build <span class="hlt">porous</span> materials with designed three dimensional (3-D) geometries and microstructures. Freeze casting uses ice crystals as a template to form <span class="hlt">porous</span> lamellar ceramic materials. Preliminary results on the compressive strengths of the materials are also reported.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6200927','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6200927"><span id="translatedtitle">Propagation of polymer slugs through <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Lecourtier, J.; Chauveteau, G.</p> <p>1984-09-01</p> <p>This paper describes an experimental and theoretical study of the mechanisms governing polymer slug propagation through <span class="hlt">porous</span> media. An analytical model taking into account the macromolecule exclusion from pore walls is proposed to predict rodlike polymer velocity in <span class="hlt">porous</span> media and thus the spreading out of polydispersed polymer slugs. Under conditions where this wall exclusion is maximum, i.e. at low shear rates and polymer concentrations, the experiments show that xanthan propagation is effectively predicted by this model. At higher flow rates and polymer concentrations, the effects of hydrodynamic dispersion and viscous fingering are analyzed. A new fractionation method for determining molecular weight distribution of polymers used in EOR is proposed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6354556','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6354556"><span id="translatedtitle">Production of <span class="hlt">porous</span> diaphragm for electrolytic cell</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Cairns, J.F.</p> <p>1983-02-01</p> <p>A process for the production of a <span class="hlt">porous</span> diaphragm suitable for use in an electrolytic cell, particularly a chlor-alkali cell, characterized in that the process comprises irradiating a <span class="hlt">porous</span> shaped article of an organic polymeric material, for example, a sheet of a fluoropolymer, with high energy radiation, the irradiation being effected in the presence of, or the irradiated shaped article being subsequently contacted with, a reactant selected from ammonia, carbon monoxide and phosgene, and the sheet preferably being subsequently contacted with an aqueous alkaline solution.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1034299','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1034299"><span id="translatedtitle"><span class="hlt">Porous</span> polymeric materials for hydrogen storage</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Yu, Luping; Liu, Di-Jia; Yuan, Shengwen; Yang, Junbing</p> <p>2011-12-13</p> <p><span class="hlt">Porous</span> polymers, tribenzohexazatriphenylene, poly-9,9'-spirobifluorene, poly-tetraphenyl methane and their derivatives for storage of H.sub.2 prepared through a chemical synthesis method. The <span class="hlt">porous</span> polymers have high specific surface area and narrow pore size distribution. Hydrogen uptake measurements conducted for these polymers determined a higher hydrogen storage capacity at the ambient temperature over that of the benchmark materials. The method of preparing such polymers, includes oxidatively activating solids by CO.sub.2/steam oxidation and supercritical water treatment.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19900000024&hterms=dialysis&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Ddialysis','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19900000024&hterms=dialysis&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Ddialysis"><span id="translatedtitle">Predicting Pressure Drop In <span class="hlt">Porous</span> Materials</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Lawing, Pierce L.</p> <p>1990-01-01</p> <p>Theory developed to predict drop in pressure based on drag of individual fibers. Simple correlation method for data also developed. Helps in predicting flow characteristics of many strain-isolation pad (SIP) glow geometries in Shuttle Orbiter tile system. Also helps in predicting venting characteristics of tile assemblies during ascent and leakage of hot gas under tiles during descent. Useful in study of mechanics of flows through fibrous and <span class="hlt">porous</span> media, and procedures applicable to purged fiberglass insulation, dialysis filters, and other fibrous and <span class="hlt">porous</span> media.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016ApPhL.108q1603J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016ApPhL.108q1603J"><span id="translatedtitle">Superhydrophobicity on nanostructured <span class="hlt">porous</span> hydrophilic material</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Jiang, Hong-Ren; Chan, Deng-Chi</p> <p>2016-04-01</p> <p>By applying laser oxidation, ablation, and plasma treatment to modify a surface of polydimethylsiloxane, we show that creating hydrophobic sites on an originally superhydrophilic nanostructured <span class="hlt">porous</span> surface greatly changes the wetting properties of the surface. The modified surface may even become superhydrophobic while the ratio of added hydrophobic site to the surface is relatively low. The relation between the contact angles and the effect of hydrophobic sites is further tested in blade scraping method and a similar result is also obtained. This method to achieve superhydrophobicity on the hydrophilic nanostructured <span class="hlt">porous</span> material may open possibilities for achieving superhydrophobicity and enable functional superhydrophobic surfaces with heterogeneous components.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2006AIPC..845...37B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2006AIPC..845...37B"><span id="translatedtitle">Dynamic Compaction Modeling of <span class="hlt">Porous</span> Silica Powder</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Borg, John P.; Schwalbe, Larry; Cogar, John; Chapman, D. J.; Tsembelis, K.; Ward, Aaron; Lloyd, Andrew</p> <p>2006-07-01</p> <p>A computational analysis of the dynamic compaction of <span class="hlt">porous</span> silica is presented and compared with experimental measurements. The experiments were conducted at Cambridge University's one-dimensional flyer plate facility. The experiments shock loaded samples of silica dust of various initial <span class="hlt">porous</span> densities up to a pressure of 2.25 GPa. The computational simulations utilized a linear Us-Up Hugoniot. The compaction events were modeled with CTH, a 3D Eulerian hydrocode developed at Sandia National Laboratory. Simulated pressures at two test locations are presented and compared with measurements.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19850000111&hterms=slurry+control+valve&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dslurry%2Bcontrol%2Bvalve','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19850000111&hterms=slurry+control+valve&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dslurry%2Bcontrol%2Bvalve"><span id="translatedtitle">Quasi-<span class="hlt">Porous</span> Plug With Vortex Chamber</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Walsh, J. V.</p> <p>1985-01-01</p> <p>Pressure-letdown valve combines quasi-<span class="hlt">porous</span>-plug and vortex-chamber in one controllable unit. Valve useful in fossil-energy plants for reducing pressures in such erosive two-phase process streams as steam/water, coal slurries, or combustion gases with entrained particles. Quasi-<span class="hlt">Porous</span> Plug consists of plenums separated by perforated plates. Number or size of perforations increases with each succeeding stage to compensate for expansion. In Vortex Chamber, control flow varies to control swirl and therefore difference between inlet and outlet pressures.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JMMM..396..237M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JMMM..396..237M"><span id="translatedtitle">Novel hybrid multifunctional magnetoelectric <span class="hlt">porous</span> composite films</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Martins, P.; Gonçalves, R.; Lopes, A. C.; Venkata Ramana, E.; Mendiratta, S. K.; Lanceros-Mendez, S.</p> <p>2015-12-01</p> <p>Novel multifunctional <span class="hlt">porous</span> films have been developed by the integration of magnetic CoFe2O4 (CFO) nanoparticles into poly(vinylidene fluoride)-Trifuoroethylene (P(VDF-TrFE)), taking advantage of the synergies of the magnetostrictive filler and the piezoelectric polymer. The <span class="hlt">porous</span> films show a piezoelectric response with an effective d33 coefficient of -22 pC/N-1, a maximum magnetization of 12 emu g-1 and a maximum magnetoelectric coefficient of 9 mV cm-1 Oe-1. In this way, a multifunctional membrane has been developed suitable for advanced applications ranging from biomedical to water treatment.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012AIPC.1426...84M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012AIPC.1426...84M"><span id="translatedtitle">Ballistic performance of <span class="hlt">porous</span>-ceramic, thermal protection systems</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Miller, Joshua E.; Bohl, William E.; Christiansen, Eric C.; Davis, Bruce A.; Foreman, Cory D.</p> <p>2012-03-01</p> <p><span class="hlt">Porous</span>-ceramic, thermal protection systems are used heavily in current reentry vehicles like the Orbiter, and they are currently being proposed for the next generation of US manned spacecraft, Orion. These systems insulate reentry critical components of a spacecraft against the intense thermal environments of atmospheric reentry. Additionally, these materials are highly exposed to space environment hazards like solid particle <span class="hlt">impacts</span>. This paper discusses <span class="hlt">impact</span> studies up to 10 km/s on 8 lb/ft3 alumina-fiber-enhanced-thermal-barrier (AETB8) tiles coated with a toughened-unipiece-fibrousinsulation/ reaction-cured-glass layer (TUFI/RCG). A semi-empirical, first principles <span class="hlt">impact</span> model that describes projectile dispersion is described that provides excellent agreement with observations over a broad range of <span class="hlt">impact</span> velocities, obliquities and projectile materials. Model extensions to look at the implications of greater than 10 GPa equation of state is also discussed. Predicted penetration probabilities for a vehicle visiting the International Space Station is 60% lower for orbital debris and 95% lower for meteoroids with this model compared to an energy scaled approach.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011APS..SHK.Q6001M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011APS..SHK.Q6001M"><span id="translatedtitle">Ballistic Performance of <span class="hlt">Porous</span>-Ceramic, Thermal Protection Systems</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Miller, Joshua; Bohl, William; Christiansen, Eric; Davis, B. Alan; Foreman, Cory</p> <p>2011-06-01</p> <p><span class="hlt">Porous</span>-ceramic, thermal protection systems are used heavily in current reentry vehicles like the Orbiter, and they are currently being proposed for the next generation of US manned spacecraft, Orion. These systems insulate reentry critical components of a spacecraft against the intense thermal environments of atmospheric reentry. Additionally, these materials are also highly exposed to space environment hazards like solid particle <span class="hlt">impacts</span>. This paper discusses <span class="hlt">impact</span> testing up to 9.65 km/s on one of these systems. The materials considered are 8 lb/ft3 alumina-fiber-enhanced-thermal-barrier (AETB8) tiles coated with a toughened-unipiece-fibrous-insulation/reaction-cured-glass layer (TUFI/RCG). A semi-empirical, first principals <span class="hlt">impact</span> model that describes projectile dispersion is described that provides excellent agreement with observations over a broad range of <span class="hlt">impact</span> velocities, obliquities and projectile materials. A model extension to look at the implications of greater than 10 GPa equation of state measurements is also discussed. Predicted penetration probabilities for a vehicle visiting the International Space Station is 60% lower for orbital debris and 95% lower for meteoroids with this model compared to an energy scaled approach.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20110011349','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20110011349"><span id="translatedtitle">Ballistic Performance of <span class="hlt">Porous</span>-Ceramic, Thermal Protection Systems</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Miller, J. E.; Bohl, W. E.; Christiansen, Eric C.; Davis, B. A.; Foreman, C. D.</p> <p>2011-01-01</p> <p><span class="hlt">Porous</span>-ceramic, thermal protection systems are used heavily in current reentry vehicles like the Orbiter, and they are currently being proposed for the next generation of US manned spacecraft, Orion. These systems insulate reentry critical components of a spacecraft against the intense thermal environments of atmospheric reentry. Additionally, these materials are highly exposed to space environment hazards like solid particle <span class="hlt">impacts</span>. This paper discusses <span class="hlt">impact</span> studies up to 10 km/s on 8 lb/cu ft alumina-fiber-enhanced-thermal-barrier (AETB8) tiles coated with a toughened-unipiece-fibrous-insulation/ reaction-cured-glass layer (TUFI/RCG). A semi-empirical, first principals <span class="hlt">impact</span> model that describes projectile dispersion is described that provides excellent agreement with observations over a broad range of <span class="hlt">impact</span> velocities, obliquities and projectile materials. Model extensions to look at the implications of greater than 10 GPa equation of state is also discussed. Predicted penetration probabilities for a vehicle visiting the International Space Station is 60% lower for orbital debris and 95% lower for meteoroids with this model compared to an energy scaled approach.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/27322176','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27322176"><span id="translatedtitle">General Preparation of Three-Dimensional <span class="hlt">Porous</span> Metal Oxide Foams Coated with Nitrogen-Doped Carbon for Enhanced Lithium Storage.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Lu, Ke; Xu, Jiantie; Zhang, Jintao; Song, Bin; Ma, Houyi</p> <p>2016-07-13</p> <p><span class="hlt">Porous</span> metal oxide architectures coated with a thin layer of carbon are attractive materials for energy storage applications. Here, a series of <span class="hlt">porous</span> metal oxide (e.g., vanadium oxides, molybdenum oxides, manganese oxides) foams with/without nitrogen-doped carbon (N-C) coating have been synthesized via a general surfactant-assisted template method, <span class="hlt">involving</span> the formation of <span class="hlt">porous</span> metal oxides coated with 1-hexadecylamine (HDA) and a subsequent thermal treatment. The presence of HDA is of importance for the formation of a <span class="hlt">porous</span> structure, and the successive pyrolysis of such a nitrogen-containing surfactant generates nitrogen-doped carbon (N-C) coated on the surface of metal oxides, which also provides a facile way to adjust the valence states of metal oxides via the carbothermal reduction reaction. When used as electrode materials, the highly <span class="hlt">porous</span> metal oxides with N-C coating exhibited enhanced performance for lithium ion storage, thanks to the unique 3D structures associated with highly <span class="hlt">porous</span> structure and thin N-C coating. Typically, the <span class="hlt">porous</span> metal oxides (V2O5, MoO3, MnO2) exhibited discharge capacities of 286, 303, and 463 mAh g(-1) at current densities of 30 and 100 mA g(-1), respectively. In contrast, the metal oxides with low valences and carbon coating (VO2@N-C, MoO2@N-C, and MnO@N-C) exhibited improved capacities of 461, 613, and 892 mAh g(-1). The capacity retentions of about 87.5, 80.2, and 85.0% for VO2@N-C, MoO2@N-C, and MnO@N-C were achieved after 600 cycles, suggesting the acceptable cycling stability. The present strategy would provide general guidance for preparing <span class="hlt">porous</span> metal oxide foams with enhanced lithium storage performances. PMID:27322176</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=gray+AND+matter&pg=7&id=EJ625997','ERIC'); return false;" href="http://eric.ed.gov/?q=gray+AND+matter&pg=7&id=EJ625997"><span id="translatedtitle">Gray Matters: The Power of Grandparent <span class="hlt">Involvement</span>.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>McCluskey, Ken; McCluskey, Andrea</p> <p>2000-01-01</p> <p>Reviews the positive <span class="hlt">impact</span> of cross-generational contact among children, parents, and grandparents. Draws on research in this field and blends theory with experiences, using personal examples to illustrate concepts of cross-generational <span class="hlt">involvement</span>. (Author/JDM)</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li class="active"><span>23</span></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_23 --> <div id="page_24" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li class="active"><span>24</span></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="461"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20090027707','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20090027707"><span id="translatedtitle">Ballistic Performance of <span class="hlt">Porous</span> Ceramic Thermal Protection Systems at 9 km/s</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Miller, Joshua E.; Bohl, W. E.; Foreman, C. D.; Christiansen, Eric L.; Davis, B. A.</p> <p>2009-01-01</p> <p><span class="hlt">Porous</span>-ceramic, thermal-protection-systems are used heavily in current reentry vehicles like the Orbiter, and they are currently being proposed for the next generation of manned spacecraft, Orion. These materials insulate the structural components and sensitive electronic components of a spacecraft against the intense thermal environments of atmospheric reentry. Furthermore, these materials are also highly exposed to space environmental hazards like meteoroid and orbital debris <span class="hlt">impacts</span>. This paper discusses recent <span class="hlt">impact</span> testing up to 9 km/s on ceramic tiles similar to those used on the Orbiter. These tiles have a <span class="hlt">porous</span>-batting of nominally 8 lb/cubic ft alumina-fiber-enhanced-thermal-barrier (AETB8) insulating material coated with a damage-resistant, toughened-unipiece-fibrous-insulation (TUFI) layer.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011LPI....42.1993H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011LPI....42.1993H"><span id="translatedtitle">Ejecta Dynamics during Hypervelocity <span class="hlt">Impacts</span> into Dry and Wet Sandstone</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hoerth, T.; Schäfer, F.; Thoma, K.; Poelchau, M.; Kenkmann, T.; Deutsch, A.</p> <p>2011-03-01</p> <p>Hypervelocity <span class="hlt">impact</span> experiments into dry and water saturated <span class="hlt">porous</span> Seeberger sandstone were conducted at the two-stage light gas accelerator at the Ernst-Mach-Institute (EMI) and the ejecta dynamics were analyzed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21090883','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21090883"><span id="translatedtitle">Form birefringence in <span class="hlt">porous</span> semiconductors and dielectrics: A review</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Golovan', L. A. Kashkarov, P. K.; Timoshenko, V. Yu.</p> <p>2007-07-15</p> <p>The phenomenon of optical anisotropy in <span class="hlt">porous</span> semiconductors and dielectrics (<span class="hlt">porous</span> silicon, gallium phosphide, and alumina) and photonic crystal structures formed on their basis is reviewed. It is shown that anisotropic nanostructuring of initially isotropic media leads to the occurrence of strong birefringence. Applicability of the effective-medium model to description of the form birefringence in <span class="hlt">porous</span> semiconductors and dielectrics is discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1129389','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1129389"><span id="translatedtitle">Microfluidic devices and methods including <span class="hlt">porous</span> polymer monoliths</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Hatch, Anson V; Sommer, Gregory J; Singh, Anup K; Wang, Ying-Chih; Abhyankar, Vinay V</p> <p>2014-04-22</p> <p>Microfluidic devices and methods including <span class="hlt">porous</span> polymer monoliths are described. Polymerization techniques may be used to generate <span class="hlt">porous</span> polymer monoliths having pores defined by a liquid component of a fluid mixture. The fluid mixture may contain iniferters and the resulting <span class="hlt">porous</span> polymer monolith may include surfaces terminated with iniferter species. Capture molecules may then be grafted to the monolith pores.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JPhCS.643a2022S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JPhCS.643a2022S"><span id="translatedtitle"><span class="hlt">Porous</span> silicon nanoparticles for target drag delivery: structure and morphology</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Spivak, Yu M.; Belorus, A. O.; Somov, P. A.; Tulenin, S. S.; Bespalova, K. A.; Moshnikov, V. A.</p> <p>2015-11-01</p> <p>Nanoparticles of <span class="hlt">porous</span> silicon were obtained by electrochemical anodic etching. Morphology and structure of the particles was investigated by means dynamic light scattering and scanning electron microscopy. The influence of technological conditions of preparation on geometrical parameters of the <span class="hlt">porous</span> silicon particles (particle size distribution, pore shape and size, the specific surface area of the <span class="hlt">porous</span> silicon) is discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1227358','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1227358"><span id="translatedtitle">Microfluidic devices and methods including <span class="hlt">porous</span> polymer monoliths</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Hatch, Anson V.; Sommer, Gregory j.; Singh, Anup K.; Wang, Ying-Chih; Abhyankar, Vinay</p> <p>2015-12-01</p> <p>Microfluidic devices and methods including <span class="hlt">porous</span> polymer monoliths are described. Polymerization techniques may be used to generate <span class="hlt">porous</span> polymer monoliths having pores defined by a liquid component of a fluid mixture. The fluid mixture may contain iniferters and the resulting <span class="hlt">porous</span> polymer monolith may include surfaces terminated with iniferter species. Capture molecules may then be grafted to the monolith pores.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title40-vol31/pdf/CFR-2011-title40-vol31-sec761-267.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title40-vol31/pdf/CFR-2011-title40-vol31-sec761-267.pdf"><span id="translatedtitle">40 CFR 761.267 - Sampling non-<span class="hlt">porous</span> surfaces.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-07-01</p> <p>... 40 Protection of Environment 31 2011-07-01 2011-07-01 false Sampling non-<span class="hlt">porous</span> surfaces. 761.267...) § 761.267 Sampling non-<span class="hlt">porous</span> surfaces. (a) Sample large, nearly flat, non-<span class="hlt">porous</span> surfaces by dividing the surface into roughly square portions approximately 2 meters on each side. Follow the procedures...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015EGUGA..17.3560D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015EGUGA..17.3560D"><span id="translatedtitle">Vorticity and upscaled dispersion in 3D heterogeneous <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Di Dato, Mariaines; Chiogna, Gabriele; de Barros, Felipe; Bellin, Alberto; Fiori, Aldo</p> <p>2015-04-01</p> <p>Modeling flow in <span class="hlt">porous</span> media is relevant for many environmental, energy and industrial applications. From an environmental perspective, the relevance of <span class="hlt">porous</span> media flow becomes evident in subsurface hydrology. In general, flow in natural <span class="hlt">porous</span> media is creeping, yet the large variability in the hydraulic conductivity values encountered in natural aquifers leads to highly heterogeneous flow fields. This natural variability in the conductivity field will affect both dilution rates of chemical species and reactive mixing. A physical consequence of this heterogeneity is also the presence of a various localized kinematical features such as straining, shearing and vorticity in aquifers, which will influence the shape of solute clouds and its fate and transport. This work aims in fundamentally characterizing the vorticity field in spatially heterogeneous flow fields as a function of their statistical properties in order to analyze the <span class="hlt">impact</span> on transport processes. In our study, three-dimensional <span class="hlt">porous</span> formations are constructed with an ensemble of N independent, non-overlapping spheroidal inclusions submerged into an homogeneous matrix, of conductivity K0. The inclusions are randomly located in a domain of volume W and are fully characterized by the geometry of spheroid (oblate or prolate), their conductivity K (random and drawn from a given probability density function fκ), the centroid location ¯x, the axes ratio e, the orientation of the rotational axis (α1,α2) and the volume w. Under the assumption of diluted medium, the flow problem is solved analitically by means of only two parameters: the conductivity contrast κ = K/K0 and the volume fraction n = Nw/W . Through the variation of these parameters of the problem, it is possible to approximate the structure of natural heterogeneous <span class="hlt">porous</span> media. Using a random distribution of the orientation of the inclusions, we create media defined by the same global anisotropy f = Iz/Ix but different micro</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2013PhRvE..87c2144W&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2013PhRvE..87c2144W&link_type=ABSTRACT"><span id="translatedtitle">Anomalous transport in weakly heterogeneous geological <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wang, Yan</p> <p>2013-03-01</p> <p>Anomalous transport is found to be ubiquitous in complex geological formations and it has a paramount <span class="hlt">impact</span> on petroleum engineering and groundwater sciences. This process can be well described by the continuous time random walk (CTRW) model, in which the probability density function w(t) of a particle's transition time t follows a power law for large t: w(t)˜t-1-α (0<α<2). In this work, based on the CTRW theory, a semifractional advection-diffusion equation is proposed to model the anomalous transport for 1<α<2, which is, as evidenced by field and numerical experiments, possibly the typical situation for many complex geological <span class="hlt">porous</span> media with weakly heterogeneous microstructures.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016CPM...tmp...15G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016CPM...tmp...15G"><span id="translatedtitle">Instationary compaction wave propagation in highly <span class="hlt">porous</span> cohesive granular media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gunkelmann, Nina; Ringl, Christian; Urbassek, Herbert M.</p> <p>2016-04-01</p> <p>We study the collision of a highly <span class="hlt">porous</span> granular aggregate of adhesive μm-sized silica grains with a hard wall using a granular discrete element method. A compaction wave runs through the granular sample building up an inhomogeneous density profile. The compaction is independent of the length of the aggregate, within the regime of lengths studied here. Also short pulses, as they might be exerted by a piston pushing the granular material, excite a compaction wave that runs through the entire material. The speed of the compaction wave is larger than the <span class="hlt">impact</span> velocity but considerably smaller than the sound speed. The wave speed is related to the compaction rate at the colliding surface and the average slope of the linear density profile.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/270497','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/270497"><span id="translatedtitle">Biopolymer system for permeability modification in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Stepp, A.K.; Bryant, R.S.; Llave, F.M.</p> <p>1995-12-31</p> <p>New technologies are needed to reduce the current high rate of well abandonment. Improved sweep efficiency, reservoir conformance, and permeability modification can have a significant <span class="hlt">impact</span> on oil recovery processes. Microorganisms can be used to selectively plug high-permeability zones to improve sweep efficiency and impart conformance control. Studies of a promising microbial system for polymer production were conducted to evaluate reservoir conditions in which this system would be effective. Factors which can affect microbial growth and polymer production include salinity, pH, temperature, divalent ions, presence of residual oil, and rock matrix. Flask tests and coreflooding experiments were conducted to optimize and evaluate the effectiveness of this system. Nuclear magnetic resonance imaging (NMRI) was used to visualize microbial polymer production in <span class="hlt">porous</span> media. Changes in fluid distribution within the pore system of the core were detected.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016CPM.....3..429G&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2016CPM.....3..429G&link_type=ABSTRACT"><span id="translatedtitle">Instationary compaction wave propagation in highly <span class="hlt">porous</span> cohesive granular media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gunkelmann, Nina; Ringl, Christian; Urbassek, Herbert M.</p> <p>2016-07-01</p> <p>We study the collision of a highly <span class="hlt">porous</span> granular aggregate of adhesive \\upmu m-sized silica grains with a hard wall using a granular discrete element method. A compaction wave runs through the granular sample building up an inhomogeneous density profile. The compaction is independent of the length of the aggregate, within the regime of lengths studied here. Also short pulses, as they might be exerted by a piston pushing the granular material, excite a compaction wave that runs through the entire material. The speed of the compaction wave is larger than the <span class="hlt">impact</span> velocity but considerably smaller than the sound speed. The wave speed is related to the compaction rate at the colliding surface and the average slope of the linear density profile.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25179275','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25179275"><span id="translatedtitle">Gastrointestinal <span class="hlt">involvement</span> in systemic sclerosis.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Savarino, Edoardo; Furnari, Manuele; de Bortoli, Nicola; Martinucci, Irene; Bodini, Giorgia; Ghio, Massimo; Savarino, Vincenzo</p> <p>2014-10-01</p> <p>Systemic sclerosis is an autoimmune chronic disease characterised by microvascular, muscular and immunologic abnormalities that lead to progressive and systemic deposition of connective tissue in the skin and internal organs. The gastrointestinal tract is often overlooked by physicians but it is the most affected organ after the skin, from the mouth to the anus. Indeed, 80% of SSc patients may present with gastrointestinal <span class="hlt">involvement</span>. Gastrointestinal manifestations range from bloating and heartburn to dysphagia and anorectal dysfunction to severe weight loss and malabsorption. However, the gastrointestinal <span class="hlt">involvement</span> is rarely the direct cause of death, but has great <span class="hlt">impact</span> on quality of life and leads to several comorbidities that subsequently affect patients' survival. Treatments, including nutritional support and prokinetics provide limited benefits and do not arrest the progressive course of the disease, but earlier detection of gastrointestinal <span class="hlt">involvement</span> may reduce the risk of complications such as malnutrition. PMID:25179275</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ars.usda.gov/research/publications/publication/?seqNo115=305100','TEKTRAN'); return false;" href="http://www.ars.usda.gov/research/publications/publication/?seqNo115=305100"><span id="translatedtitle">Transport, retention, and size perturbation of graphene oxide in saturated <span class="hlt">porous</span> media: Effects of input concentration and grain size</span></a></p> <p><a target="_blank" href="http://www.ars.usda.gov/services/TekTran.htm">Technology Transfer Automated Retrieval System (TEKTRAN)</a></p> <p></p> <p></p> <p>Accurately predicting the fate and transport of graphene oxide (GO) in <span class="hlt">porous</span> media is critical to assess its environmental <span class="hlt">impact</span>. In this work, sand column experiments were conducted to determine the effect of input concentration and grain size on transport, retention, and size perturbation of GO ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1128707','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1128707"><span id="translatedtitle">Activation of <span class="hlt">porous</span> MOF materials</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Hupp, Joseph T; Farha, Omar K</p> <p>2014-04-01</p> <p>A method for the treatment of solvent-containing MOF material to increase its internal surface area <span class="hlt">involves</span> introducing a liquid into the MOF in which liquid the solvent is miscible, subjecting the MOF to supercritical conditions for a time to form supercritical fluid, and releasing the supercritical conditions to remove the supercritcal fluid from the MOF. Prior to introducing the liquid into the MOF, occluded reaction solvent, such as DEF or DMF, in the MOF can be exchanged for the miscible solvent.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1083304','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1083304"><span id="translatedtitle">Activation of <span class="hlt">porous</span> MOF materials</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Hupp, Joseph T; Farha, Omar K</p> <p>2013-04-23</p> <p>A method for the treatment of solvent-containing MOF material to increase its internal surface area <span class="hlt">involves</span> introducing a liquid into the MOF in which liquid the solvent is miscible, subjecting the MOF to supercritical conditions for a time to form supercritical fluid, and releasing the supercritical conditions to remove the supercritical fluid from the MOF. Prior to introducing the liquid into the MOF, occluded reaction solvent, such as DEF or DMF, in the MOF can be exchanged for the miscible solvent.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2014acm..conf..393O&link_type=ABSTRACT','NASAADS'); return false;" href="http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2014acm..conf..393O&link_type=ABSTRACT"><span id="translatedtitle">Experimental investigation for cavity dimensions of highly <span class="hlt">porous</span> small bodies</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Okamoto, T.; Nakamura, A.; Hasegawa, S.</p> <p>2014-07-01</p> <p>Small bodies were probably very <span class="hlt">porous</span> during the formation of the solar system. In order to understand the surface evolution of highly <span class="hlt">porous</span> bodies, it is necessary to investigate the <span class="hlt">impact</span> process for targets with such high porosity. In this study, <span class="hlt">impact</span> experiments with sintered glass-bead targets of 87 and 94 % porosities were conducted. Growth of cavities with time and the final cavity dimensions were analyzed and compared with previous studies of <span class="hlt">porous</span> targets. <span class="hlt">Impact</span> experiments were conducted using a two-stage light-gas gun at ISAS, Japan. The projectiles of a few millimeters were composed of titanium, aluminum, nylon, and basalt. The <span class="hlt">impact</span> velocities ranged from 1.8 to 7.2 km s^{-1}. In order to observe the inside of the targets, we used a flash X-ray system and a micro-X-ray tomography instrument. The track shape was found to be divided into two types, elongated 'carrot' shape and short 'bulb' shape [1]. The figures on the left and right present a transmission image of the bulb shape track and a sketch of a cross section of the cavity, respectively. The results of the final maximum diameter, D_max and the final entrance-hole diameter, D_ent show that both dimensions tend to increase with <span class="hlt">impact</span> velocity and decrease with target porosity. We adopted the scaling law of crater diameter [2] for our analysis of D_max and D_ent. The following empirical relations are obtained for targets with porosity ≥ 87 %: {D_max}/{d_p}(ρ_t/ρ_p)^{0.4} =10^{-1.52±0.27} ({Y}/ρ_t{v_0^2})^{-0.49 ± 0.07}, {D_ent}/{d_p}(ρ_t/ρ_p)^{0.4} =10^{-2.12±0.39} ({Y}/ρ_t{v_0^2})^{-0.53 ± 0.11}, where d_p, ρ_t, ρ_p, Y, and v_0 are the projectile diameter, target density, projectile density, target compressive strength, and the <span class="hlt">impact</span> velocity, respectively. The results of the depth from the entrance hole to the maximum diameter of the cavity, L_max, shows that L_max decreases with <span class="hlt">impact</span> velocity and increases with target porosity. If we assume that a projectile decelerates</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1980WRR....16..811J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1980WRR....16..811J"><span id="translatedtitle">Heat and Mass Transfer in a Freezing Unsaturated <span class="hlt">Porous</span> Medium</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Jame, Yih-Wu; Norum, Donald I.</p> <p>1980-08-01</p> <p>A numerical simulation of a laboratory experiment <span class="hlt">involving</span> coupled heat and mass transfer in a horizontal <span class="hlt">porous</span> medium column with one end subjected to a temperature below 0°C has been carried out. The model is essentially that of Harlan (1973) and is solved numerically by the finite difference method using the Crank-Nicholson scheme. The solution yields temperature, liquid water content, and ice content profiles along the column as a function of time. Comparison of the experimental results and the simulation analysis results shows that Harlan's model, with some modification in the hydraulic conductivity of the frozen medium, can be used successfully to simulate numerically the coupled heat and mass transfer processes when ice lensing does not occur.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1983nmlt.conf.....E','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1983nmlt.conf.....E"><span id="translatedtitle">Numerical method for computing flow through partially saturated <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Eaton, R. R.</p> <p></p> <p>This paper discusses the development of the finite element computer code SAGUARO which calculates the two-dimensional flow of mass and energy through <span class="hlt">porous</span> media. The media may be saturated or partially saturated. SAGUARO solves the parabolic time-dependent mass transport equation which accounts for the presence of partially saturated zones through the use of highly non-linear material characteristic curves. The energy equation accounts for the possibility of partially-saturated regions by adjusting the thermal capacitances and thermal conductivities according to the volume fraction of water present in the local pores. The code capabilities are demonstrated through the presentation of a sample problem <span class="hlt">involving</span> the one dimensional calculation of simultaneous energy transfer and water infiltration into partially saturated hard rock.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1274884','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/1274884"><span id="translatedtitle">Adsorption Kinetics in Nanoscale <span class="hlt">Porous</span> Coordination Polymers</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Nune, Satish K.; Thallapally, Praveen K.; McGrail, Benard Peter; Annapureddy, Harsha V. R.; Dang, Liem X.; Mei, Donghai; Karri, Naveen; Alvine, Kyle J.; Olszta, Matthew J.; Arey, Bruce W.; Dohnalkova, Alice</p> <p>2015-10-07</p> <p>Nanoscale <span class="hlt">porous</span> coordination polymers were synthesized using simple wet chemical method. The effect of various polymer surfactants on colloidal stability and shape selectivity was investigated. Our results suggest that the nanoparticles exhibited significantly improved adsorption kinetics compared to bulk crystals due to decreased diffusion path lengths and preferred crystal plane interaction.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li class="active"><span>24</span></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_24 --> <div id="page_25" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li class="active"><span>25</span></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="481"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/867640','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/867640"><span id="translatedtitle"><span class="hlt">Porous</span> radiant burners having increased radiant output</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Tong, Timothy W.; Sathe, Sanjeev B.; Peck, Robert E.</p> <p>1990-01-01</p> <p>Means and methods for enhancing the output of radiant energy from a <span class="hlt">porous</span> radiant burner by minimizing the scattering and increasing the adsorption, and thus emission of such energy by the use of randomly dispersed ceramic fibers of sub-micron diameter in the fabrication of ceramic fiber matrix burners and for use therein.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=65462&keyword=insulation&actType=&TIMSType=+&TIMSSubTypeID=&DEID=&epaNumber=&ntisID=&archiveStatus=Both&ombCat=Any&dateBeginCreated=&dateEndCreated=&dateBeginPublishedPresented=&dateEndPublishedPresented=&dateBeginUpdated=&dateEndUpdated=&dateBeginCompleted=&dateEndCompleted=&personID=&role=Any&journalID=&publisherID=&sortBy=revisionDate&count=50&CFID=77928374&CFTOKEN=33308998','EPA-EIMS'); return false;" href="http://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=65462&keyword=insulation&actType=&TIMSType=+&TIMSSubTypeID=&DEID=&epaNumber=&ntisID=&archiveStatus=Both&ombCat=Any&dateBeginCreated=&dateEndCreated=&dateBeginPublishedPresented=&dateEndPublishedPresented=&dateBeginUpdated=&dateEndUpdated=&dateBeginCompleted=&dateEndCompleted=&personID=&role=Any&journalID=&publisherID=&sortBy=revisionDate&count=50&CFID=77928374&CFTOKEN=33308998"><span id="translatedtitle">TESTING ANTIMICROBIAL EFFICACY ON <span class="hlt">POROUS</span> MATERIALS</span></a></p> <p><a target="_blank" href="http://oaspub.epa.gov/eims/query.page">EPA Science Inventory</a></p> <p></p> <p></p> <p>The efficacy of antimicrobial treatments to eliminate or control biological growth in the indoor environment can easily be tested on nonporous surfaces. However, the testing of antimicrobial efficacy on <span class="hlt">porous</span> surfaces, such as those found in the indoor environment [i.e., gypsum ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/432952','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/432952"><span id="translatedtitle"><span class="hlt">Porous</span> Si structure as moisture sensor</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Peterson, D.W.; Nguyen, L.T.</p> <p>1996-12-31</p> <p>Development and characterization of a capacitive moisture sensor made from <span class="hlt">porous</span> Si is presented. The sensor development was in support of the DoD funded Plastic Package Availability program and was intended for the detection of pinholes and defects in moisture barrier coatings applied to ICs during fabrication or during the plastic encapsulation assembly process.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3568110','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3568110"><span id="translatedtitle">Highly <span class="hlt">porous</span> drug-eluting structures</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Elsner, Jonathan J.; Kraitzer, Amir; Grinberg, Orly; Zilberman, Meital</p> <p>2012-01-01</p> <p>For many biomedical applications, there is need for <span class="hlt">porous</span> implant materials. The current article focuses on a method for preparation of drug-eluting <span class="hlt">porous</span> structures for various biomedical applications, based on freeze drying of inverted emulsions. This fabrication process enables the incorporation of any drug, to obtain an “active implant” that releases drugs to the surrounding tissue in a controlled desired manner. Examples for <span class="hlt">porous</span> implants based on this technique are antibiotic-eluting mesh/matrix structures used for wound healing applications, antiproliferative drug-eluting composite fibers for stent applications and local cancer treatment, and protein-eluting films for tissue regeneration applications. In the current review we focus on these systems. We show that the release profiles of both types of drugs, water-soluble and water-insoluble, are affected by the emulsion's formulation parameters. The former's release profile is affected mainly through the emulsion stability and the resulting <span class="hlt">porous</span> microstructure, whereas the latter's release mechanism occurs via water uptake and degradation of the host polymer. Hence, appropriate selection of the formulation parameters enables to obtain desired controllable release profile of any bioactive agent, water-soluble or water-insoluble, and also fit its physical properties to the application. PMID:23507890</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25575124','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25575124"><span id="translatedtitle">Diffusiophoresis in suspensions of charged <span class="hlt">porous</span> particles.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Huang, Hsin Y; Keh, Huan J</p> <p>2015-02-01</p> <p>An analysis of the diffusiophoretic motion in a suspension of charged <span class="hlt">porous</span> spheres in an electrolytic solution with a macroscopic concentration gradient is presented. Each <span class="hlt">porous</span> particle can be a solvent-permeable and ion-penetrable charged floc or polyelectrolyte molecule, in which the densities of the fixed charges and frictional segments are constant, surrounded by an arbitrary electric double layer. The multiparticle interaction effects are considered through the use of a unit cell model, which allows the overlap of adjacent double layers. The differential equations governing the electric potential, ionic concentration, and fluid velocity distributions inside and outside the <span class="hlt">porous</span> particle in a unit cell are linearized by assuming that the system is only slightly deviated from equilibrium and then solved as power expansions in its dimensionless fixed-charge density. A closed-form expression for the diffusiophoretic velocity of the <span class="hlt">porous</span> particle correct to the second order of the fixed charge density is obtained from a balance between the electrostatic and hydrodynamic forces acting on it. Detailed comparisons of the results for the multiparticle diffusiophoresis obtained from the cell model with various boundary conditions are made. The effect of particle interactions on the diffusiophoresis, which is a linear combination of electrophoresis and chemiphoresis, can be significant and complicated in typical situations. Although the electrophoretic mobility of the particles decreases with an increase in the particle volume fraction, their chemiphoretic mobility is not necessarily a monotonic function of it. PMID:25575124</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/867599','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/867599"><span id="translatedtitle">Method of making <span class="hlt">porous</span> ceramic fluoride</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Reiner, Robert H.; Holcombe, Cressie E.</p> <p>1990-01-01</p> <p>A process for making a <span class="hlt">porous</span> ceramic composite where fumed silica particles are coated with a nitrate, preferably aluminum nitrate. Next the nitrate is converted to an oxide and formed into a desired configuration. This configuration is heated to convert the oxide to an oxide silicate which is then react with HF, resulting in the fluoride ceramic, preferably aluminum fluoride.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/874700','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/874700"><span id="translatedtitle">Open-cell glass crystalline <span class="hlt">porous</span> material</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Anshits, Alexander G.; Sharonova, Olga M.; Vereshchagina, Tatiana A.; Zykova, Irina D.; Revenko, Yurii A.; Tretyakov, Alexander A.; Aloy, Albert S.; Lubtsev, Rem I.; Knecht, Dieter A.; Tranter, Troy J.; Macheret, Yevgeny</p> <p>2002-01-01</p> <p>An open-cell glass crystalline <span class="hlt">porous</span> material made from hollow microspheres which are cenospheres obtained from fly ash, having an open-cell porosity of up to 90 vol. % is produced. The cenospheres are separated into fractions based on one or more of grain size, density, magnetic or non-magnetic, and perforated or non-perforated. Selected fractions are molded and agglomerated by sintering with a binder at a temperature below the softening temperature, or without a binder at a temperature about, or above, the softening temperature but below the temperature of liquidity. The <span class="hlt">porous</span> material produced has an apparent density of 0.3-0.6 g/cm.sup.3, a compressive strength in the range of 1.2-3.5 MPa, and two types of openings: through-flow wall pores in the cenospheres of 0.1-30 micrometers, and interglobular voids between the cenospheres of 20-100 micrometers. The <span class="hlt">porous</span> material of the invention has properties useful as <span class="hlt">porous</span> matrices for immobilization of liquid radioactive waste, heat-resistant traps and filters, supports for catalysts, adsorbents and ion-exchangers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3085453','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3085453"><span id="translatedtitle">Bioinspired Strong and Highly <span class="hlt">Porous</span> Glass Scaffolds</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Saiz, Eduardo; Tomsia, Antoni P.</p> <p>2011-01-01</p> <p>The quest for more efficient energy-related technologies is driving the development of <span class="hlt">porous</span> and high-performance structural materials with exceptional mechanical strength. Natural materials achieve their strength through complex hierarchical designs and anisotropic structures that are extremely difficult to replicate synthetically. We emulate nature’s design by direct-ink-write assembling of glass scaffolds with a periodic pattern, and controlled sintering of the filaments into anisotropic constructs similar to biological materials. The final product is a <span class="hlt">porous</span> glass scaffold with a compressive strength (136 MPa) comparable to that of cortical bone and a porosity (60%) comparable to that of trabecular bone. The strength of this <span class="hlt">porous</span> glass scaffold is ~100 times that of polymer scaffolds and 4–5 times that of ceramic and glass scaffolds with comparable porosities reported elsewhere. The ability to create both <span class="hlt">porous</span> and strong structures opens a new avenue for fabricating scaffolds for a broad array of applications, including tissue engineering, filtration, lightweight composites, and catalyst support. PMID:21544222</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1994PhFl....6..469H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1994PhFl....6..469H"><span id="translatedtitle">Exit flows from highly <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hall, M. J.; Hiatt, J. P.</p> <p>1994-02-01</p> <p>This paper presents laser velocimetry measurements of the streamwise component of mean velocities and turbulence intensities measured downstream from the exit plane of <span class="hlt">porous</span> ceramic foams through which air is flowed. The recent development and commercial availability of <span class="hlt">porous</span> ceramic foams has lead to their application in many fields. Their uses have extended to combustion, high-temperature fluid filtering, biotechnology, and as support matrix for catalysts. These applications have created an interest in their pore scale fluid mechanics, both within the <span class="hlt">porous</span> matrix and along surfaces open to flow. One emerging application is <span class="hlt">porous</span> ceramic burners which combust liquid or gaseous fuels within the pore matrix or along the surface of the ceramic. The ceramic foams have pore sizes ranging from 4 to 12 pores per cm (ppcm) and porosities of 85%. Mean velocities between 0.3 and 1.5 m/s were examined. Radial distributions of mean velocities show a jet-like structure through the pores, with local mean velocities reaching maximum values over two times the area mean velocity. Negative mean velocities were often observed between pores, suggesting that recirculation zones are present above the web-like struts surrounding the pores. Levels of turbulence intensities normalized by the area mean velocity ranged from 0.05 to 0.6 for the various flow rates and pore sizes. Turbulence intensities were found to increase with increasing pore size for a given flow rate.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19780000518&hterms=Gas+chromatography&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3DGas%2Bchromatography','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19780000518&hterms=Gas+chromatography&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3DGas%2Bchromatography"><span id="translatedtitle"><span class="hlt">Porous</span> bead packings for gas chromatography</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Pollock, G. E.; Woeller, F. H.</p> <p>1979-01-01</p> <p><span class="hlt">Porous</span> polyaromatic packing beads have low polarity, high efficiency, short retention time, and may be synthesized in size range of 50 to 150 micrometers (100 to 270 mesh). Mechanically strong beads may be produced using various materials depending on elements and compounds to be identified.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1174645','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1174645"><span id="translatedtitle">Open-cell glass crystalline <span class="hlt">porous</span> material</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Anshits, Alexander G.; Sharonova, Olga M.; Vereshchagina, Tatiana A.; Zykova, Irina D.; Revenko, Yurii A.; Tretyakov, Alexander A.; Aloy, Albert S.; Lubtsev, Rem I.; Knecht, Dieter A.; Tranter, Troy J.; Macheret, Yevgeny</p> <p>2003-12-23</p> <p>An open-cell glass crystalline <span class="hlt">porous</span> material made from hollow microspheres which are cenospheres obtained from fly ash, having an open-cell porosity of up to 90 vol. % is produced. The cenospheres are separated into fractions based on one or more of grain size, density, magnetic or non-magnetic, and perforated or non-perforated. Selected fractions are molded and agglomerated by sintering with a binder at a temperature below the softening temperature, or without a binder at a temperature about, or above, the softening temperature but below the temperature of liquidity. The <span class="hlt">porous</span> material produced has an apparent density of 0.3-0.6 g/cm.sup.3, a compressive strength in the range of 1.2-3.5 MPa, and two types of openings: through-flow wall pores in the cenospheres of 0.1-30 micrometers, and interglobular voids between the cenospheres of 20-100 micrometers. The <span class="hlt">porous</span> material of the invention has properties useful as <span class="hlt">porous</span> matrices for immobilization of liquid radioactive waste, heat-resistant traps and filters, supports for catalysts, adsorbents and ion-exchangers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/17723292','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/17723292"><span id="translatedtitle"><span class="hlt">Porous</span> silicon biosensor for detection of viruses.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Rossi, Andrea M; Wang, Lili; Reipa, Vytas; Murphy, Thomas E</p> <p>2007-12-15</p> <p>There is a growing need for virus sensors with improved sensitivity and dynamic range, for applications including disease diagnosis, pharmaceutical research, agriculture and homeland security. We report here a new method for improving the sensitivity for detection of the bacteriophage virus MS2 using thin films of nanoporous silicon. <span class="hlt">Porous</span> silicon is an easily fabricated material that has extremely high surface area to volume ratio, making it an ideal platform for surface based sensors. We have developed and evaluated two different methods for covalent bioconjugation of antibodies inside of <span class="hlt">porous</span> silicon films, and we show that the pore penetration and binding efficiency depend on the wettability of the <span class="hlt">porous</span> surface. The resulting films were used to selectively capture dye-labeled MS2 viruses from solution, and a viral concentration as low as 2 x 10(7) plaque-forming units per mL (pfu/mL) was detectable by measuring the fluorescence from the exposed <span class="hlt">porous</span> silicon film. The system exhibits sensitivity and dynamic range similar to the Luminex liquid array-based assay while outperforming protein micro-array methods. PMID:17723292</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/816364','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/816364"><span id="translatedtitle">Pressure diffusion waves in <span class="hlt">porous</span> media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Silin, Dmitry; Korneev, Valeri; Goloshubin, Gennady</p> <p>2003-04-08</p> <p>Pressure diffusion wave in <span class="hlt">porous</span> rocks are under consideration. The pressure diffusion mechanism can provide an explanation of the high attenuation of low-frequency signals in fluid-saturated rocks. Both single and dual porosity models are considered. In either case, the attenuation coefficient is a function of the frequency.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20150016931','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20150016931"><span id="translatedtitle"><span class="hlt">Porous</span> Cross-Linked Polyimide Networks</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Meador, Mary Ann B. (Inventor); Guo, Haiquan (Inventor)</p> <p>2015-01-01</p> <p><span class="hlt">Porous</span> cross-linked polyimide networks are provided. The networks comprise an anhydride end-capped polyamic acid oligomer. The oligomer (i) comprises a repeating unit of a dianhydride and a diamine and terminal anhydride groups, (ii) has an average degree of polymerization of 10 to 50, (iii) has been cross-linked via a cross-linking agent, comprising three or more amine groups, at a balanced stoichiometry of the amine groups to the terminal anhydride groups, and (iv) has been chemically imidized to yield the <span class="hlt">porous</span> cross-linked polyimide network. Also provided are <span class="hlt">porous</span> cross-linked polyimide aerogels comprising a cross-linked and imidized anhydride end-capped polyamic acid oligomer, wherein the oligomer comprises a repeating unit of a dianhydride and a diamine, and the aerogel has a density of 0.10 to 0.333 g/cm.sup.3 and a Young's modulus of 1.7 to 102 MPa. Also provided are thin films comprising aerogels, and methods of making <span class="hlt">porous</span> cross-linked polyimide networks.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/5107556','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/5107556"><span id="translatedtitle">Absorption of ozone by <span class="hlt">porous</span> particles</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Afanas'ev, V.P.; Dorofeev, S.B.; Sinitsyn, V.I.; Smirnov, B.M.</p> <p>1981-11-01</p> <p>The absorption of ozone by <span class="hlt">porous</span> zeolite, silica gel, and activated carbon particles has been studied experimentally. It was shown that in addition to absorption, dissociation of ozone on the surface plays an important and sometimes decisive role. The results obtained were used to analyze the nature of ball lightning.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/880032','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/880032"><span id="translatedtitle">Zein Recovery Using Non-<span class="hlt">Porous</span> Membranes</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Mairal, Anurag P.; Ng, Alvin; Wijmans, Johannes G.</p> <p>2005-01-25</p> <p>A membrane process for treating zein solutions to increase the zein concentration in the solution. The process uses a non-<span class="hlt">porous</span> membrane that preferentially permeates the solvent and rejects the zein. Optionally, the process can be operated as a diafiltration process to yield a concentrate of high zein purity.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/5460811','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/5460811"><span id="translatedtitle">Reaction profiles in <span class="hlt">porous</span> electrodes. Final report</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Katan, T.; Carlen, P.J.</p> <p>1985-05-01</p> <p>An experimental program was conducted to ascertain causes of alkaline zinc electrode shape change and to determine the development of reaction profiles within the pores of <span class="hlt">porous</span> zinc electrodes. Various analog electrochemical cells were operated to isolate and evaluate the individual processes occurring during charge and discharge. It was found that both edge effects and osmosis can be responsible for the shape change phenomenon.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20050212420','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20050212420"><span id="translatedtitle"><span class="hlt">Porous</span> Ceramic Spheres From Cation Exchange Beads</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Dynys, Fred</p> <p>2005-01-01</p> <p>This document is a slide presentation that examines the use of a simple templating process to produce hollow ceramic spheres with a pore size of 1 to 10 microns. Using ion exchange process it was determined that the method produces <span class="hlt">porous</span> ceramic spheres with a unique structure: (i.e., inner sphere surrounded by an outer sphere.)</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25069746','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25069746"><span id="translatedtitle">Estimation of the effects of longitudinal temperature gradients caused by frictional heating on the solute retention using fully <span class="hlt">porous</span> and superficially <span class="hlt">porous</span> sub-2μm materials.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Fekete, Szabolcs; Fekete, Jenő; Guillarme, Davy</p> <p>2014-09-12</p> <p>In this study, the retention changes induced by frictional heating were evaluated for model small compounds (150-190Da) and a small protein, namely insulin (5.7kDa). For this purpose, the effect of longitudinal temperature gradient caused by frictional heating was experimentally dissociated from the combined effect of pressure and frictional heating, by working either in constant and variable inlet pressure modes. Various columns packed with core-shell and fully <span class="hlt">porous</span> sub-2μm particles were tested. It appears that frictional heating was less pronounced on the column packed with smallest core-shell particles (1.3μm), compared to the ones packed with core-shell and fully <span class="hlt">porous</span> particles of 1.7-1.8μm. This observation was attributed to the low permeability of this material and the fact that it can only be employed in a restricted flow rate range, thus limiting the generated heat power. In addition, the thermal conductivity of the solid silica core of superficially <span class="hlt">porous</span> particles (1.4W/m/K) is known to be much larger than that of fully <span class="hlt">porous</span> silica. Then, the heat dissipation is improved. However, if systems with higher pressure capability would be available and the mechanical stability of 1.3μm core-shell material was extended to e.g. 2000bar, the retention would be more severely <span class="hlt">impacted</span>. At 2000bar, ∼4.4W heat power and +30°C increase at column outlet temperature is expected. Last but not least, when analyzing large molecules, the <span class="hlt">impact</span> of pressure overcomes the frictional heating effects. This was demonstrated in this study with insulin (∼5.7kDa). PMID:25069746</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20000000304','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20000000304"><span id="translatedtitle"><span class="hlt">Porous</span> Media and Mixture Models for Hygrothermal Behavior of Phenolic Composites</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Sullivan, Roy M.; Stokes, Eric H.</p> <p>1999-01-01</p> <p>Theoretical models are proposed to describe the interaction of water with phenolic polymer. The theoretical models <span class="hlt">involve</span> the study of the flow of a viscous fluid through a <span class="hlt">porous</span> media and the thermodynamic theory of mixtures. From the theory, a set of mathematical relations are developed to simulate the effect of water on the thermostructural response of phenolic composites. The expressions are applied to simulate the measured effect of water in a series of experiments conducted on carbon phenolic composites.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li class="active"><span>25</span></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_25 --> <center> <div class="footer-extlink text-muted"><small>Some links on this page may take you to non-federal websites. 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