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1

Thermodynamics of the Na2O-P2O5 system  

NASA Astrophysics Data System (ADS)

The activity of Na2O in the melts of the Na2O-P2O5 system has been determined using a high temperature electrochemical cell with a Na2O-WO3 melt at the reference electrode and fused silica as the solid electrolyte as shown below. _{Na_2 O - WO_3 melt}^{Pt(s),O_2 (g)} left| {_{fused silica}^{ Na^ + } } right|_{Na_2 O - P_2 O_5 melt}^{O_2 (g), Pt(s)} The thermodynamics of the Na2O-P2O5 binary system in the composition range of 50 to 75 mole pet Na2O has been studied. The activities of Na2O and P2O5 in the melt have been carefully analyzed. The free energy of four sodium phosphates has been evaluated with the help of the phase diagram of this system. Based on this study, a solid-state phase transformation for the 3Na2O·P2O5 compound has been suggested at a temperature below 1217 K. The entropy of the transformation is near zero. The enthalpy of transformation is estimated to be 101.51 kJ/mole 3Na2O·P2O5.

Huang, Chu T.; Lin, Ray Y.

1989-04-01

2

Effects of substituting B2O3 for P2O5 on the structures and properties of V2O5-P2O5 glass systems  

NASA Astrophysics Data System (ADS)

V2O5-B2O3-P2O5 glasses with various compositions were prepared using a normal melt quenching technique, and their characteristics and structural properties were investigated using different techniques. Replacement of P2O5 by B2O3 was found to improve the thermal properties, chemical durability, and room-temperature conductivity. The observed variations in the properties may be correlated with changes in the internal glass network as a result of changes in the chemical composition. Vanadium ions are believed to be present in three possible valence states, namely V3+, V4+, and V5+, and the ratios of these states depend on the glass composition. The observed increases in chemical durability and room-temperature conductivity are assumed to be related to increases in the mean crosslinking density, increases in the number of bridging oxygens, and electron hopping between vanadate ions in different valence states.

Han, Kyungseok; Hwang, Chawon; Kim, Donghwan; Gwoo, Donggun; Kim, Taehee; Choi, Wongyu; Kee, Kyungbum; Kim, Jonghwan; Ryu, Bongki

2012-12-01

3

The significance of Cl/P2O5 ratios from lunar samples  

NASA Technical Reports Server (NTRS)

The Cl(r)/P2O5 ratios of lunar samples are reported to occur in three groups (Jovanovic and Reed, 1975; etc.). These data have been modeled as representative of three discrete volumes of differentiating magma and correlated with large convection cells and moon-wide heterogeneities. The assumptions inherent to their model are not valid. That the Cl(r)/P2O5 ratio of apatite or a rock is indicative of a magma system is unrealistic. A range of ratios can be generated during the fractionation of a magma. Apatite is not the major Cl- and P-bearing phase in most of the samples analyzed; rust, FeO(OH, Cl) and schreibersite, (FeNi)3P, occur in over 2/3 rds of the Apollo 16 rocks where they constitute 0.1-0.6 modal %, enough to account for most of the Cl(r) and P2O5 analyzed. Due to the complexities and presence of these minerals in soils and breccias, Cl(r)/P2O5 ratios have no real significance in non-igneous samples. However, basaltic rocks alone do not define any statistically significant Cl(r)P2O5 groupings.

Taylor, L. A.; Hunter, R. H.

1982-01-01

4

Luminescence of phosphorus containing oxide materials: Crystalline SiO2-P and 3P2O5?7SiO2; CaO?P2O5; SrO?P2O5 glasses  

NASA Astrophysics Data System (ADS)

Luminescence of phosphate glasses such as CaO?P2O5 and SrO?P2O5 is compared with that of phosphorus doped crystalline ?-quartz and phosphosilicate glass with content 3P2O5?7SiO2. Water & OH groups are found by IR spectra in these materials. The spectrum of luminescence contains many bands in the range 1.5 - 5.5 eV. The luminescence bands in UV range at 4.5-5 eV are similar in those materials. Decay duration in exponential approximation manifests a time constant about 37 ns. Also a component in ?s range was detected. PL band of ?s component is shifted to low energy with respect to that of ˜37 ns component. This shift is about 0.6 eV. It is explained as singlet-triplet splitting of excited state. Below 14 K increase of luminescence kinetics duration in ?s range was observed and it was ascribed to zero magnetic field splitting of triplet excited state of the center. Yellow-red luminescence was induced by irradiation in phosphorus doped crystalline ?-quartz, phosphosilicate glasses. The yellowl uminescence contains two bands at 600 and 740 nm. Their decay is similar under 193 nm laser and may be fitted with the first order fractal kinetics or stretched exponent. Thermally stimulated luminescence contains only band at 600 nm. The 248 nm laser excites luminescence at 740 nm according to intra center process with decay time constant about 4 ms at 9 K. Both type of luminescence UV and yellow were ascribed to different defects containing phosphorus. P-doped ?-quartz sample heated to 550 co become opalescent. Ir spectra related to water & OH groups are changed. Photoluminescence intensity of all three bands, UV (250 nm), yellow (600 nm) and red (740 nm) strongly diminished and disappeared after heating to 660 C°. Radiation induced red luminescence of non-bridging oxygen luminescence center (NBO) appeared in crystal after heat treatment. We had observed a crystalline version of this center (l. Skuja et al, Nuclear Instruments and Methods in Physics Research B 286,159-168 (2012)). Effect of heat treatment explained as sedimentation of phosphorus in some state. Keeping of treated sample at 450-500 C° leads to partial revival of ability to create yellow luminescence center under irradiation.

Trukhin, A. N.; Smits, K.; Jansons, J.; Berzins, D.; Chikvaidze, G.; Griscom, D. L.

2014-10-01

5

P-T phase diagram and structural transformations of molten P2O5 under pressure  

NASA Astrophysics Data System (ADS)

The P2O5 compound is an archetypical glass-forming oxide with a record high hygroscopicity, which makes its study extremely difficult. We present the in situ x-ray diffraction study of the pressure-temperature phase diagram of P2O5 and, particularly, of the liquid P2O5 structure under high pressure up to 10 GPa. Additionally, quenching from the melt has been used to extend the melting curve up to 15 GPa. We found that structural transformation in the liquid P2O5 under pressure is unique and includes three stages: first, the disappearance of the intermediate range order of the melt together with a slow increase in the average first-coordination number (P-O and O-P neighbors) up to 4 GPa; second, the "normal" compression almost without structural modification at higher pressures up to 8-9 GPa; and, finally, the abrupt change of the short-range order structure of the liquid with the jumplike increase at 9-10 GPa. The last stage correlates with the melting curve maximum (?1250 °C) at ?10 GPa and can be interpreted as a transformation to the liquid phase with entirely fivefold-coordinated phosphorus and twofold-coordinated oxygen atoms.

Brazhkin, V. V.; Katayama, Y.; Lyapin, A. G.; Saitoh, H.

2014-03-01

6

Optimization of the thermodynamic properties and phase diagrams of P2O5-containing systems  

NASA Astrophysics Data System (ADS)

P2O5 is an important oxide component in the late stage products of numerous igneous rocks such as granites and pegmatites. Typically, P2O5 combines with CaO and crystallizes in the form of apatite, while in volatile-free conditions, Ca-whitlockite is formed. In spite of their interest, the thermodynamic properties and phase diagrams of P2O5-containg systems are not well known yet. In the case of the pure P2O5 for example, no experimental thermodynamic data are available for the liquid and the O and O' solid phases. As a result, we re-evaluated all the thermodynamic and phase diagram data of the P2O5 unary system [1]. Optimization of the thermodynamic properties and phase diagrams of the binary P2O5 systems was then performed including the Li2O-, Na2O-, MgO-, CaO-, BaO-, MnO-, FeO-, Fe2O3-, ZnO-, Al2O3-, and SiO2-P2O5 [2] systems. All available thermodynamic and phase equilibrium data were simultaneously reproduced in order to obtain a set of model equations for the Gibbs energies of all phases as functions of temperature and composition. In particular, the Gibbs energy of the liquid solution was described using the Modified Quasichemical Model [3-5] implemented in the FactSage software [6]. Thermodynamic modeling of the Li2O-Na2O-K2O-MgO-CaO-FeO-Fe2O3-Al2O3-SiO2 system, which include many granite-forming minerals such as nepheline, leucite, pyroxene, melilite, feldspar and spinel is currently in progress. [1] Jung, I.-H., Hudon, P. (2012) Thermodynamic assessment of P2O5. J. Am. Ceram. Soc., 95 (11), 3665-3672. [2] Rahman, M., Hudon, P. and Jung, I.-H. (2013) A coupled experimental study and thermodynamic modeling of the SiO2-P2O5 system. Metall. Mater. Trans. B, 44 (4), 837-852. [3] Pelton, A.D. and Blander, M. (1984) Computer-assisted analysis of the thermodynamic properties and phase diagrams of slags. Proc. AIME Symp. Metall. Slags Fluxes, TMS-AIME, 281-294. [4] Pelton, A.D. and Blander, M. (1986) Thermodynamic analysis of ordered liquid solutions by a modified quasichemical approach application to silicate slags. Metall. Trans. B, 17, 805-815. [5] A.D. Pelton, S.A. Decterov, G. Eriksson, C. Robelin and Y. Dessureault (2000) The modified quasichemical model - I Binary solutions. Metall. Mater. Trans. B, 31, 651-660. [6] C.W. Bale, P. Chartrand, S.A. Decterov, G. Eriksson, K. Hack, R. Ben Mahfoud, J. Melançon, A.D. Pelton and S. Petersen. (2002) FactSage Thermochemical Software and Databases. Calphad, 26, 189-228.

Hudon, Pierre; Jung, In-Ho

2014-05-01

7

Critical Evaluation and Thermodynamic Optimization of the CaO-P2O5 System  

NASA Astrophysics Data System (ADS)

A critical evaluation and thermodynamic optimization of all available experimental data of the CaO-P2O5 system was performed to obtain a set of thermodynamic functions which can reproduce all available and reliable experimental phase diagram and thermodynamic data. The modified quasichemical model, which takes into account short range ordering, was employed to describe the thermodynamic properties of the liquid phase. Discrepancies observed in the Gibbs energy of formation of the compounds were resolved and phase diagram and thermodynamic data of all the solid and liquid phases were well reproduced within experimental errors limits including the sharp liquidus of Ca3(PO4)2.

Hudon, Pierre; Jung, In-Ho

2015-02-01

8

High pressure behavior of P2O5 crystalline modifications: compressibility, elastic properties and phase transitions  

NASA Astrophysics Data System (ADS)

Solid phases of the P2O5 compound have rarely been studied under high pressure to date due to their record-high hygroscopicity. We present the results of in situ x-ray diffraction study of the structure of P2O5 molecular and polymeric modifications under pressures up to 11 GPa, as well as the results of an ultrasonic study of a molecular phase up to 2 GPa. At low pressures (0.3–0.7 GPa), there is a structural transformation in the molecular phase accompanied by a significant (7–8%) density increase. This phase transition is accompanied by a large increase of both the shear modulus (by 30–40%) and bulk modulus (by 20–25%). Compression curves of the molecular and polymeric covalent phases asymptotically converge to each other at 9–10 GPa and reach a density of 3.6–3.7 g cm?3. The polymeric modification is ‘typical’ for covalent oxides values of the bulk modulus and its derivative: B ? 35–40 GPa, B?P ? 3–4. The molecular phase has quite small values of the bulk and shear moduli (B ? 12 GPa, G ? 5 GPa).

Brazhkin, V. V.; Gromnitskaya, E. L.; Danilov, I. V.; Katayama, Y.; Lyapin, A. G.; Popova, S. V.

2015-02-01

9

Structure of SnF2-SnO-P2O5 Glasses  

NASA Astrophysics Data System (ADS)

Low melting point glasses, specifically tin fluorophosphates, have recently received attention as a successful host matrix to rare earth metals to be used in photon conversion for solar cell applications. We have used high resolution X-ray photoelectron spectroscopy and Raman microscopy to investigate the structure of 50SnF2-20SnO-30P2O5 glass. To compliment this experimental study density functional theory was used to predict Raman spectra. The O 1s X-ray photoelectron spectra indicate a high non-bridging to bridging oxygen ratio, a sign of relatively high durability needed for this glass to be applied to solar energy. The experimental results are in good agreement with theoretical calculations.

York-Winegar, James; Harper, Tristan; Brennan, Carrie; Oelgoetz, Justin; Kovalskiy, Andriy

10

Effects of CaO/P2O5 ratio on the structure and elastic properties of SiO2-CaO-Na2O-P2O5 bioglasses.  

PubMed

The evolution of elastic properties and structure upon the change of CaO/P(2)O(5) ratio in SiO(2)-CaO-Na(2)O-P(2)O(5) glasses (45S5-derived and 55S4-derived) at ambient conditions has been studied by using both Brillouin and Raman spectroscopy coupled with X-ray diffraction. Under the same SiO(2)/Na(2)O ratio, it is found that a decrease in CaO/P(2)O(5) molar ratio has caused a more-polymerized silicate network via a net consumption of Q(0), Q(1), and Q(2) species yet enriching in Q(3) and Q(4) species. Brillouin experiments revealed that all the bulk, shear and Young's moduli of the glasses studied increases with the increase of CaO/P(2)O(5) molar ratio. The unexpected variation trend in shear modulus can be correlated to the contribution from cohesion, the less-polymerized phosphate Q species, and density. Compared to the 45S5-derived, the more-polymerized 55S4-deived glass has a lower bulk but slightly higher shear modulus at the given CaO/P(2)O(5) ratio. PMID:22109904

Lin, Chung-Cherng; Chen, Shih-Fan; Leung, Kak Si; Shen, Pouyan

2012-02-01

11

Effect of P2O5 and FetO on the Viscosity and Slag Structure in Steelmaking Slags  

NASA Astrophysics Data System (ADS)

The present paper investigates the influence of P2O5 and FetO on the viscosity and structure of steelmaking slags. An understanding of the viscous behavior and structure of FetO-bearing smelting slags is essential to control the dephosphorization in steelmaking process and to efficiently recycle the phosphorus from steelmaking slags. It is found that the viscosity of CaO-SiO2-Al2O3-MgO-FetO-P2O5 slags slightly increases with increasing P2O5 content, while the viscosity decreases with increasing FetO content. The degree of the polymerization of quenched slags, determined from Raman spectra, is found to increase with increasing P2O5 content and decrease with increasing FetO content. It is also noted that the peaks of Raman spectra between 800 and 1200 cm-1 were nearly absent at the FetO content of 22.46 wt pct; whereas according to 29Si MAS-NMR and FTIR analysis, it is clearly seen that the [SiO4]-tetrahedra-related peaks existed even for the same slag. This may confirm that small quantities of extra-framework iron species can absorb the Raman scattering and damp the Raman signal intensity and the presence of FetO in the slag does not necessarily eliminate [SiO4]-tetrahedra.

Wang, Z. J.; Shu, Q. F.; Sridhar, S.; Zhang, M.; Guo, M.; Zhang, Z. T.

2015-01-01

12

Interaction Studies Between Crofer-22APU Alloy And P2O5 Containing Barium Calcium Alumino-borosilicate (BCABS) Sealant Glass-Ceramics  

NASA Astrophysics Data System (ADS)

We present the effect of P2O5 addition on barium calcium aluminum borosilicate BCABS glasses of composition (mol %) 35BaO-15CaO-5Al2O3-(37-x)SiO2-8B2O3-xP2O5 (0?x?5). The incorporation of P2O5 increased network polymerization and crystallization tendency. However, addition of P2O5 leads to the formation of Cr2O3 at the interface, saturating it in the ions of the metal. This improves glass-to-metal bonding.

Ananthanarayanan, A.; Montagne, L.; Revel, B.; Kothiyal, G. P.

2010-12-01

13

FT-IR and thermoluminescence investigation of P2O5-BaO-K2O glass system  

NASA Astrophysics Data System (ADS)

The 0.5P2O5?xBaO?(0.5-x)K2O glass system (0?x?0.5mol%) is investigated by FT-IR and thermoluminescence as a possible dosimetic material. FT-IR spectra show structural network modifications with the composition variations of the studied glasses. The predominant absorption bands are characterized by two broad peaks near 500 cm-1, two weak peaks around 740 cm-1 and three peaks in the 900-1270 cm-1 region. The shift in the position of the band assigned to asymmetric stretching of PO2- group, ?as(PO2-) modes from ˜1100 cm-1 to 1085 cm-1 and the decrease in its relative intensity with the increasing of K2O content shows a network modifier role of this oxide.. Luminescence investigations show that by adding modifier oxides in the phosphate glass a dose dependent TL signals result upon irradiation. Thus P2O5-BaO-K2O glass system is a possible candidate material for dosimetry in the dose 0 - 50 Gy range.

Ivascu, C.; Timar-Gabor, A.; Cozar, O.

2013-11-01

14

Effect of P2O5 and MnO2 on crystallization of magnetic glass ceramics  

PubMed Central

This work pointed out the effect of adding P2O5 and/or MnO2 on the crystallization behavior of magnetic glass ceramic in the system Fe2O3·ZnO·CaO·SiO2·B2O3. The differential thermal analysis of the quenched samples revealed decrease in the thermal effects by adding P2O5 and/or MnO2 to the base sample. The X-ray diffraction patterns show the development of nanometric magnetite crystals in a glassy matrix. Heat treatment at 800 °C for 2 h, under reducing atmosphere, caused an increase in the amount of the crystallized magnetite with the appearance of minor hematite and Ca2SiO4. The transmission electron microscope revealed a crystallite size in the range 10–30 nm. Magnetic hysteresis cycles were analyzed with a maximum applied field of 25 kOe at room temperature. The prepared magnetic glass ceramics are expected to be useful for localized treatment of cancer. PMID:25685522

Abdel-Hameed, Salwa A.M.; Marzouk, Mohamed A.; Farag, Mohamed M.

2013-01-01

15

FT-IR, Raman and thermoluminescence investigation of P 2O 5-BaO-Li 2O glass system  

NASA Astrophysics Data System (ADS)

The 0.5P 2O 5· xBaO·(0.5- x) Li 2O glass system (0 ? x ? 0.5 mol%) is investigated by FT-IR, Raman and thermoluminescence as a possible dosimetic material. FT-IR and Raman spectra show structural network modifications with the composition variations of the studied glasses. The predominant absorption band from IR spectra is attributed to the symmetric stretching vibrations of P = O double bonds. Raman spectra of the studied glasses contain also typical phosphate glasses bands. Thus the band at ˜700 cm -1 is assigned to symmetric stretching vibrations of P-O-P groups and that from ˜1158 cm -1 is attributed to symmetric stretching motions of the non-bridging oxygen (NBO) atoms bonded to phosphorous atoms (PO 2) in phosphate tetrahedron. Finally FT-IR and Raman spectroscopies revealed a local network structure mainly based on Q 2 and Q 3 tetrahedrons connected by P-O-P linkages. Luminescence investigations show that by adding modifier oxides to phosphate glass dose dependent TL signals result upon irradiation. Thus P 2O 5-BaO-Li 2O glass system is a possible candidate material for dosimetry in the high dose range (>10 Gy).

Ivascu, C.; Timar Gabor, A.; Cozar, O.; Daraban, L.; Ardelean, I.

2011-05-01

16

Optical Properties of Pb0-ZnO-P2O5 Glasses Doped With Samarium and Neodymium  

NASA Astrophysics Data System (ADS)

(PbO)30(ZnO)20(P2O5)50-x(Nd2O3)x and (PbO)30(ZnO)20(P2O5)50-x(Sm2O3)x glasses (where x = 0.5, 1, 2%) have been prepared by conventional melt quenching method. Measurements of X-ray diffractrogram reveal samples prepared are amorphous in nature, DSC studies have been made and the glass transition temperature (Tg), crystallization temperature (Tc) and glass stability factor have been evaluated. These glasses exhibit high transition temperature (Tg) and high stability factor (S) indicating glasses are stable. IR spectra of these glasses show absorption peaks at 1215 cm-1, 1072 cm-1 and 728 cm-1 corresponding to P = O, P-O-P and P-O- vibrations. Optical absorption studies show absorption peaks in the range of 462.5-584 nm for various transition in the Nd3+ ion and 287.5-562.5 nm in case Sm3+.

Lakshmikantha, R.; Rajaramakrishna, R.; Anavekar, R. V.; Ayachit, N. H.

2011-07-01

17

Photoluminescence and radioluminescence properties of MnO-doped SnO-ZnO-P2O5 glasses  

NASA Astrophysics Data System (ADS)

In this study, the photoluminescence and radioluminescence properties of MnO-doped SnO-ZnO-P2O5 glasses are examined. We have confirmed that linear dose-dependence and radioluminescence emission decay depend on Mn2+ concentration. Energy transfer from donor Sn2+ center to acceptor Mn2+ center is observed in both photoluminescence and radioluminescence processes, and the energy transfer efficiency is more than 90% when the Mn2+/Sn2+ ratio is 5. Since emission intensity of Mn2+ is higher than that of Sn2+ in radioluminescence compared to photoluminescence, it is suggested that energy transfer from the host matrix to Mn2+ center by X-ray occurred preferentially over energy transfer to Sn2+ center. The present results suggest that the conventional parity rule for photoluminescence is not always adaptable for radioluminescence, although emission-related energy levels are the same for both the processes.

Masai, Hirokazu; Hino, Yusuke; Yanagida, Takayuki; Fujimoto, Yutaka

2015-04-01

18

Elaboration and structural characterization of glasses inside the ternary SrO-TiO2-P2O5 system  

NASA Astrophysics Data System (ADS)

The glasses in the SrO-TiO2-P2O5 system were prepared by the conventional quenching route. The amorphous state of samples was verified by X-ray diffraction (XRD). Density, molar volume, micro-hardness, glass transition temperature (Tg), and crystallization temperature (Tc) parameters are determined for each glass. The results show that they depend strongly on the chemical compositions. The structure approach of the glasses is determined by using Infrared spectroscopy (IR). This investigation highlights that the glassy-matrix contains various phosphate structural units. The crystallization of the glasses by heat-treatments is performed and the crystallized phases Sr3P4O13, TiP2O7, Sr(PO3)2 are identified by XRD. The overall results are correlated to the glass structure and the nature of chemical bonds constituting the glass network.

Sinouh, H.; Bih, L.; Azrour, M.; El Bouari, A.; Benmokhtar, S.; Manoun, B.; Belhorma, B.; Baudin, T.; Berthet, P.; Haumont, R.; Solas, D.

2012-07-01

19

Dc and AC Conductivity Studies on Ag2O-P2O5-V2O5 Glass System  

NASA Astrophysics Data System (ADS)

Composition, temperature and frequency dependence conductivity studies have been carried out on xAg2O-(50-x)P2O5-50V2O5 (x = 5 to 40 mol%) glass system. The dc conductivity is found to increase with increase of Ag2O concentration up to 30 mol% and further increase of Ag2O concentration the conductivity decreases sharply. The activation energy also shows compositional dependence. The ac conductivity data has been analyzed by fitting the data in to Almond-West type power law behaviour ? (?) = ? (0) + A ?s. The values of s were found to decrease with the increase of temperature and show a weak minimum around 400K. The results are discussed on the basis of existing models by considering the structural groups present in these glasses.

Anavekar, R. V.; Eraiah, B.

2002-12-01

20

Effects of the substitution of P2O5 by B2O3 on the structure and dielectric properties in (90-x) P2O5-xB2O3-10Fe2O3 glasses  

NASA Astrophysics Data System (ADS)

90%[xB2O3 (1-x) P2O5] 10%Fe2O3, glass systems where (x = 0 mol%, 5 mol%, 10 mol%, 15 mol%, 20 mol%) was prepared via a melt quenching technique. The structure of glass is investigated at room temperature by, Raman and EPR spectroscopy. Raman studies have been performed on these glasses to examine the distribution of different borate and phosphate structural groups. We have noted an increase from 3 to 4 in the coordination number of the boron atoms from 3 to 4, i.e., the conversion of the BO3 triangular structural units into BO4 tetrahedra. The samples have been investigated by means of electron paramagnetic resonance (EPR). The results obtained from the gef = 4.28 EPR line are typical of the occurrence of iron (III) occupying substitutional sites. Moreover, the dielectric sizes such as ??(?), ??(?), imaginary parts of the electrical modulus, M*(?) and the loss tan ?, their variation with frequency at room temperature show a decrease in relaxation intensity with an increase in the concentration of (B2O3). On the present work, we have found a weak extinction index with our new glass.

Sdiri, N.; Elhouichet, H.; Dhaou, H.; Mokhtar, F.

2014-01-01

21

Effects of the substitution of P2O5 by B2O3 on the structure and dielectric properties in (90-x) P2O5-xB2O3-10Fe2O3 glasses.  

PubMed

90%[xB2O3 (1-x) P2O5] 10%Fe2O3, glass systems where (x=0 mol%, 5 mol%, 10 mol%, 15 mol%, 20 mol%) was prepared via a melt quenching technique. The structure of glass is investigated at room temperature by, Raman and EPR spectroscopy. Raman studies have been performed on these glasses to examine the distribution of different borate and phosphate structural groups. We have noted an increase from 3 to 4 in the coordination number of the boron atoms from 3 to 4, i.e., the conversion of the BO3 triangular structural units into BO4 tetrahedra. The samples have been investigated by means of electron paramagnetic resonance (EPR). The results obtained from the gef=4.28 EPR line are typical of the occurrence of iron (III) occupying substitutional sites. Moreover, the dielectric sizes such as ?'(?), ??(?), imaginary parts of the electrical modulus, M(*)(?) and the loss tan?, their variation with frequency at room temperature show a decrease in relaxation intensity with an increase in the concentration of (B2O3). On the present work, we have found a weak extinction index with our new glass. PMID:23995605

Sdiri, N; Elhouichet, H; Dhaou, H; Mokhtar, F

2014-01-01

22

Ion transport studies on Li2O-PbO-B2O3-P2O5 glass system  

NASA Astrophysics Data System (ADS)

Electrical conductivity of Li+ ion conducting borophosphate glass system with the general formula xLi2O -10PbO-(90-x) [55B2O3 + 45 P2O5] where x=20, 25, 30 and 35 has been carried out both as a function of temperature and frequency in the temperature range 303K to 503K and over frequencies 20 Hz to 12 MHz. The dc conductivities show Arrhenius behaviour while exhibiting composition dependence. Edc estimated from Arrhenius plots varies from 0.82 eV 0.88 eV. The ac conductivity behaviour has been analyzed using a single power law. The exponent `s' obtained from the power law fits is found to have values ranging from 0.45 to 0.84.in these glasses and shows moderate temperature dependence The stretched exponent ? also is seen to vary slightly with temperature. Scaling behaviour also has been carried out using the reduced plots of conductivity and frequency. The time-temperature superposition of data points is found to be satisfactory indicating that the ion transport mechanism remains the same in the entire range of temperatures and compositions studied. The results have been explained considering the borophosphate network and the role of Li2O as a glass modifier.

Muralidhara, R. S.; Anavekar, R. V.

2009-07-01

23

Thermoluminescence investigations on xY2O3 (60-x)P2O5·40SiO2 vitroceramics.  

PubMed

Thermoluminescence properties of xY2O3·(60-x)P2O5·40SiO2 vitroceramic compounds doped with xY2O3 at various concentrations (0?x?30mol%) were studied. Compounds with reduced Y2O3 concentration showed unsatisfactory dosimetric properties, while the vitroceramics composed of 20Y2O3·40P2O5·40SiO2 and 30Y2O3·30P2O5·40SiO2 exhibited bright signals, linear dose response and minimum detectable doses of 16mGy and 4mGy, respectively. Moreover, 30mol% Y2O3 doped vitroceramic exhibited good repeatability, acceptable batch homogeneity and poor fading signal, features that are recommending this material for dosimetry purposes. PMID:25637884

Biró, Barna; Pascu, Andrada; Timar-Gabor, Alida; Simon, Viorica

2015-04-01

24

Fabrication of Li 2O–B 2O 3–P 2O 5 solid electrolyte by aerosol flame deposition for thin film batteries  

Microsoft Academic Search

Amorphous Li2O–B2O3–P2O5 thin films were prepared from an aqueous precursor solution of a LiNO3 and BCl3, POCl3 by Aerosol Flame Deposition. The aqueous precursor solution of the LiNO3 was first atomized with an ultrasonic vibrator (1.7 MHz), and B2O3 and P2O5 were synthesized from BCl3 and POCl3 by an oxygen–hydrogen flame. Their microstructure and electrical properties were investigated by SEM, XRD,

Kihyun Cho; Teawon Lee; Jangwon Oh; Dongwook Shin

2007-01-01

25

Hydroxyapatite/SiO(2)-CaO-P(2)O(5) glass materials: in vitro bioactivity and biocompatibility.  

PubMed

Materials obtained by the heat treatment of mixtures of hydroxyapatite (HA) and a silicate-based glass of the system SiO(2)-CaO-P(2)O(5) have been investigated. The influence of the glass content on the porosity, microstructure and on the constituent phases of the final materials was studied. The influence of these factors on the in vitro bioactive behaviour of the obtained materials was also investigated. In addition, an in vitro biocompatibility assay with osteoblastic-like cells was carried out. The addition of the glass to HA induced different solid-state reactions that yield the transformation of HA into alpha- and beta-tricalcium phosphate as well as the formation of silicon-containing phases (silicocarnotite or pseudowollastonite). In these mixtures an enhancement in the porosity, pore size and a heterogeneous microstructure was observed, compared with the precursors. As the sol gel glass content increased, the previous effects were higher. The materials showed the formation of an apatite-like layer on their surface when soaked in simulated body fluid, being faster in the sample with a higher content of glass. The formation of the new layer began in preferential zones in both samples, depending on the different reactivity of the crystalline phases formed. A synergistic effect between HA and glass was observed, showing in the mixtures a faster bioactive behaviour than in HA and glass themselves. The obtained materials allow a good attachment, spread and proliferation of the osteoblastic-like cells and no cytotoxic effect was observed. PMID:16701892

Padilla, S; Román, J; Sánchez-Salcedo, S; Vallet-Regí, M

2006-05-01

26

Phosphate glasses for tissue engineering: Part 1. Processing and characterisation of a ternary-based P2O5-CaO-Na2O glass system.  

PubMed

This paper presents the results of a study of the thermal properties, X-ray powder diffraction (XRPD), NMR and solubility of a range of phosphate-based glasses. Ion release and pH measurements were also obtained. The compositions were limited by fixing the P2O5 mol% content at 45, 50 and 55 mol%, and varying the CaO mol% at 30, 35 and 40 mol%. Initial data collected from thermal analysis showed an increase in the Tg values, with increasing CaO mol%, as expected. An increase in crystallisation temperatures with increasing CaO mol% was also observed, with sharp peaks indicating the presence of single and/or double phases. Initial XRPD data revealed that the 45 mol% P2O5 precipitated a calcium bridged trimetaphosphate (Na4Ca[PO3]6) at the sodium oxide contents of 25 and 20 mol%, but at the 15 mol% level two phases formed, NaCa[PO3]3 and Ca2P2O7. The 50 mol% P2O5 compositions showed two sodium phosphate-rich phases [NaCa(PO3)3 and NaPO3] for the lower calcium containing compositions, and a calcium phosphate phase [CaP2O6] for compositions with higher CaO mol%. The 55 mol% P2O5 compositions, exhibited similar phases for the lower calcium containing compositions, and a single calcium phosphate phase (CaP2O6) was identified for the higher calcium containing composition. NMR analysis revealed the presence of Q1 and Q2 species in the 45 mol% P2O5 compositions, and Q2 species present in the 50 and 55 mol% P2O5 compositions. The non-linear data obtained from the thermal and solubility analyses conducted were attributed to the packing density of the 45 mol% P2O5 compositions. The solubility was seen to decrease with increasing CaO mol%, for all the glasses investigated, and all the compositions showed a gradual decrease in pH with time, and this was accounted for by the release of Na+ and Ca2+ ions into solution. PMID:14585698

Ahmed, I; Lewis, M; Olsen, I; Knowles, J C

2004-02-01

27

Influence of Ag 2O on some physical properties of LiF–TiO 2–P 2O 5 glass system  

Microsoft Academic Search

LiF–TiO2–P2O5 glasses mixed with different concentrations of Ag2O (ranging from 0 to 1.5mol%) were prepared. The samples were characterized by X-ray diffraction, scanning electron microscopy. The optical absorption and ESR spectral studies of these glasses have indicated that the titanium ions exist in Ti3+ state in addition to Ti4+ state in these samples. The IR spectral studies exhibit bands due

M. Nagarjuna; T. Satyanarayana; Y. Gandhi; N. Veeraiah

2009-01-01

28

Vitreous solid state electrolytes in the system of RNO 3–Zn(NO 3) 2–KHSO 4–P 2O 5  

Microsoft Academic Search

The structure and electric conductivity of glasses in the system RNO3–Zn(NO3)2–KHSO4–P2O5 (R=Na, K) obtained at different temperatures were investigated by IR and impedance spectroscopy. Glasses fused at 250–350 °C demonstrated an increase of their ionic conductivity in 103 times in comparison with the same compositions fused at 550 °C. The influence of the chemical composition on the structure and properties of the

J. C. Perez-Medina; A. V. Gorokhovsky; J. I. Escalante-García

2006-01-01

29

Characteristics of CuO-MoO3-P2O5 catalyst and its catalytic wet oxidation (CWO) of dye wastewater under extremely mild conditions.  

PubMed

In order to develop a catalyst with high activity for catalytic wet oxidation (CWO) processing at lower temperatures (35 degrees C) and atmospheric pressure, a new CuO-MoO3-P2O5 catalystwas synthesized by a solid-state reaction method and was characterized by X-ray diffraction (XRD), Fourier transformation infrared spectrometer (FTIR), X-ray photoelectron spectroscopy (XPS), selected area electronic diffraction (SAED), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDXS) for elemental mapping. Methylene blue (MB) was adopted to investigate the catalytic activity of CuO-MoO3-P2O5 in CWO processing. The results show that this new catalyst has a high catalytic activity to decolorize MB under mild condition. The color removal of MB (the initial concentration was 0.3 g L(-1) and initial pH was 5) can reach to 99.26% within 10 min at 35 degrees C and atmospheric pressure. Catalyst lifespan and selectivity were also tested, and the results show that after the catalyst was used three times, catalyst activity still remains. Selectivity testing shows that CuO-MoO3-P2O5 has high catalytic activity on degradation of MB, whereas this catalyst has less impact on methyl orange (the color removal was 99.65% for MB and 55% for methyl orange under the same conditions). According to the experimental results, a possible mechanism of catalytic degradation of MB was proposed. PMID:18044531

Ma, Hongzhu; Zhuo, Qiongfang; Wang, Bo

2007-11-01

30

The Comparative Structural Study of Vitreous Matrices P2O5?MeO [MeO ? Li2O (M1) or CaO (M2)] Systems and xFe2O3(100-x)[P2O5?MeO] Glasses by Raman Spectroscopy  

NASA Astrophysics Data System (ADS)

For getting information about the way in which the structural units presented in glass matrices P2O5?Li2O (M1) and P2O5?CaO (M2) are modifying with the substitutions Li2O with CaO, these glasses where investigated by Raman spectroscopies. The absorption bands obtained and their assignments for each those two matrices are summarized. The influence of Fe2O3 content on the structure of M1 and M2 matrices was followed.

Andronache, C.

2010-01-01

31

Optical band gap studies on (55? x)Na 2O– xPbO–45P 2O 5 (SLP) glass system  

Microsoft Academic Search

Sodium lead phosphate (SLP) glasses in the series (55?x)Na2O–xPbO–45P2O5 with x varying from 55 to 0 were prepared by the single step melt quenching process with Na2CO3(sodiumcarbonate),PbO (lead monoxide) and NH4H2PO4 (ammonium dihydrogen phosphate – ADP) as starting materials. The 12 samples prepared were grouped into two batches with batch A having 55?x?30 for increasing Na2O and batch B having

K. Subrahmanyam; M. Salagram

2000-01-01

32

Phase Analysis and Crystallographic Properties of the Phosphate Systems MO-ZrO 2 -P 2 O 5 (M=Mg, Ca, Sr or Ba)  

Microsoft Academic Search

Phase formation in the systems MO-ZrO2-P2O5 (M=Mg, Ca, Sr or Ba) with various ratios of M to Zr cations and within the temperature interval from 20 to 1200°C was investigated\\u000a by means of DTA, TG, XRD and IR spectroscopy. The orthophosphate phases M0.5xZr2.25?0.25x(PO4)3 with x=0?1, 3 and 7 were synthesized. Concentration and temperature limits of phase existence were found for

V. I. Petkov; A. I. Orlova

1998-01-01

33

Structure, dielectric and bioactivity of P2O5-CaO-Na2O-B2O3 bioactive glass  

NASA Astrophysics Data System (ADS)

Bioactive phosphate glasses have been widely investigated for bone repair. Phosphate glass system of 47P2O5-30.5CaO-(22.5-x)Na2O-xB2O3 has been prepared by melt quenching technique. From the Raman analysis, it is confirmed that phosphate network form metaphosphate structure. Bioactivity of the glass is studied by immersing the prepared glass in simulated body fluid (SBF). All the glasses exhibited bioactivity after soaking in SBF. Addition of B2O3 to the glass by replacing the Na2O produces considerable effect on the dielectric and bioactivity of the glass. Ion dynamics are also analyzed through imaginary modulus and imaginary dielectric permittivity.

Maheswaran, A.; Hirankumar, G.; Heller, Nithya; Karthickprabhu, S.; Kawamura, Junichi

2014-06-01

34

Optical band gap studies on (55- x)Na 2O- xPbO-45P 2O 5 (SLP) glass system  

NASA Astrophysics Data System (ADS)

Sodium lead phosphate (SLP) glasses in the series (55- x)Na 2O- xPbO-45P 2O 5 with x varying from 55 to 0 were prepared by the single step melt quenching process with Na2CO3 ( sodium carbonate ), PbO (lead monoxide) and NH 4H 2PO 4 (ammonium dihydrogen phosphate - ADP) as starting materials. The 12 samples prepared were grouped into two batches with batch A having 55? x?30 for increasing Na 2O and batch B having 0? x?25 for increasing PbO to understand the roles of Na 2O and PbO in phosphate network. The optical absorption spectra of these glasses were recorded in the range 240-300 nm. The fundamental optical absorption edges were observed for all glasses except for Na 2O-P 2O 5 glass with x=0. From these absorption edge studies the optical band gap ( Eopt) and the Urbach energy ( ?E) values have been evaluated by following the available semi-empirical theories. The Eopt values were found to vary from 4.33 to 4.49 eV for batch A with increasing Na 2O content and from 4.55 to 4.40 eV for batch B with increasing PbO content. The Eopt behavior with increasing Na 2O was found to be complementary to increasing PbO in the glass network. The role of Na 2O is found to increase the Eopt value by causing decrease in the number of bridging oxygens affected.

Subrahmanyam, K.; Salagram, M.

2000-12-01

35

In vitro bioactivity evaluation, mechanical properties and microstructural characterization of Na2O-CaO-B2O3-P2O5 glasses.  

PubMed

Na2O-CaO-B2O3-P2O5 glasses have been prepared by the melt-quenching method. B2O3 content was systematically increased from 5 to 30mol%, at the expense of P2O5, in the chemical composition of these glasses. Density, Vickers microhardness and fracture toughness of the prepared glasses were measured. In vitro bioactivity of the glasses was assessed by soaking in the simulated body fluid (SBF) at 37±0.5°C for 3, 7, 14 and 30days. The glasses were tested in the form of glass grains as well as bulk slabs. The structure and composition of the solid reaction products were analyzed using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS). The kinetics of degradation of the glass particles were monitored by measuring the weight loss of the particles and the ionic concentration of Ca, P and B in the SBF solution using inductive coupled plasma-atomic emission spectroscopy (ICP-AES). The obtained results revealed the formation of a bioactive hydroxyapatite (HA) layer, composed of nano-crystallites, on the surface of glass grains after the in vitro assays. The results have been used to understand the formation of HA as a function of glass composition and soaking time in the SBF. It can be pointed out that increasing B2O3 content in glass composition enhances the bioactivity of glasses. The nanometric particle size of the formed HA and in vitro bioactivity of the studied glasses make them possible candidates for tissue engineering application. PMID:25748986

Abo-Naf, Sherief M; Khalil, El-Sayed M; El-Sayed, El-Sayed M; Zayed, Hamdia A; Youness, Rasha A

2015-06-01

36

Preparation, structure and bioactivity of xAu 2O 3·(100 - x)[P 2O 5·CaO] glass system  

NASA Astrophysics Data System (ADS)

Gold doped calcium phosphate glasses were prepared by the melting method. The structure of Au 2O 3-P 2O 5-CaO glasses is investigated using X-ray diffraction, infrared absorption and Raman scattering. The depth characterization of their structures is essential for the understanding of the properties of biocompatible materials. Thermal analysis DTA and TGA were also made to study behavior under different temperature regions and to see chemical changes versus time and temperature of these glasses. Bioactivity of the glasses was investigated in vitro by examining apatite formation on the surface of glasses treated in acellular simulated body fluid (SBF) with ion concentrations nearly equal to those in human blood plasma. Formation of bioactive apatite layer on the samples treated in SBF for 28 days at 37 °C was confirmed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The effect of SBF soaking induces structural changes on the surface, reflected by the appearance of nano-crystalline particles agglomerated into micro-aggregates.

Regos, Adriana N.; Ardelean, I.

2011-12-01

37

Influence of germanium oxide addition on the electrical properties of Li2O-B2O3-P2O5 glasses  

NASA Astrophysics Data System (ADS)

Lithium ion transport upon the addition of germanium oxide in a series of mixed glass former lithium borophosphate glasses has been investigated. The electrical and dielectric properties of (100 - x)[0.5Li2O-0.1B2O3-0.4P2O5]-xGeO2 with 0-25 mol% GeO2 glasses have been studied over a wide temperature (183-523 K) and frequency range (0.01 Hz-1 MHz). The increase in dc conductivity with the addition of GeO2 is attributed to the formation of ion conducting channels arising from the structural modification and formation of the P-O-Ge linkages, resulting in an easy migration of Li+ ions along these bonds. At higher GeO2 content glass network becomes more densely packed and ionic conductivity is slightly hindered as a consequence of the increase of bonding forces inside the network. Such a decrease in the conductivity is more reflection of the stronger cross-linkage in the glass network than that of the slight decrease in the Li+ ion concentration. The electrical modulus formalism is used to describe the dielectric relaxation. The scaling of the ac conductivity results in an excellent collapse onto common master curve whereas the electrical modulus spectra showed slight deviation indicating the distribution of relaxation times caused by the presence of various structural units in the glass network.

Moguš-Milankovi?, Andrea; Sklepi?, Kristina; Blažanovi?, Hrvoje; Mošner, Petr; Vorokhta, Maryna; Koudelka, Ladislav

2013-11-01

38

Structural study of Al2O3-Na2O-CaO-P2O5 bioactive glasses as a function of aluminium content  

NASA Astrophysics Data System (ADS)

Calcium phosphate based biomaterials are extensively used in the context of tissue engineering: small changes in composition can lead to significant changes in properties allowing their use in a wide range of applications. Samples of composition (Al2O3)x(Na2O)0.11-x(CaO)0.445(P2O5)0.445, where x = 0, 0.03, 0.05, and 0.08, were prepared by melt quenching. The atomic-scale structure has been studied using neutron diffraction and solid state 27Al MAS NMR, and these data have been rationalised with the determined density of the final glass product. With increasing aluminium concentration the density increases initially, but beyond about 3 mol. % Al2O3 the density starts to decrease. Neutron diffraction data show a concomitant change in the aluminium speciation, which is confirmed by 27Al MAS NMR studies. The NMR data reveal that aluminium is present in 4, 5, and 6-fold coordination and that the relative concentrations of these environments change with increasing aluminium concentration. Materials containing aluminium in 6-fold coordination tend to have higher densities than analogous materials with the aluminium found in 4-fold coordination. Thus, the density changes may readily be explained in terms of an increase in the relative concentration of 4-coordinated aluminium at the expense of 6-fold aluminium as the Al2O3 content is increased beyond 3 mol. %.

Smith, J. M.; King, S. P.; Barney, E. R.; Hanna, J. V.; Newport, R. J.; Pickup, D. M.

2013-01-01

39

Neutron scattering study on cathode LiMn2O4 and solid electrolyte 5(Li2O)(P2O5)  

NASA Astrophysics Data System (ADS)

Neutron scattering is very important technique in order to investigate the energy storage materials such as lithium-ion battery. The unique advantages, neutron can see the light atoms such as Hydrogen, Lithium, and Oxygen, where those elements are negligible by other corresponding X-ray method. On the other hand, the energy storage materials, such as lithium ion battery is very important for the application in the electric vehicles, electronic devices or home appliances. The battery contains electrodes (anode and cathode), and the electrolyte materials. There are many challenging to improve the existing lithium ion battery materials, in order to increase their life time, cyclic ability and also its stability. One of the most scientific challenging is to investigate the crystal structure of both electrode and electrolyte, such as cathodes LiCoO2, LiMn2O4 and LiFePO4, and solid electrolyte Li3PO4. Since all those battery materials contain Lithium ions and Oxygen, the used of neutron scattering techniques to study their structure and related properties are very important and indispensable. This article will review some works of investigating electrodes and electrolytes, LiMn2O4 and 5(Li2O)(P2O5), by using a high resolution powder diffraction (HRPD) at the multipurpose research reactor, RSG-Sywabessy of the National Nuclear Energy Agency (BATAN), Indonesia.

Kartini, E.; Putra, Teguh P.; Jahya, A. K.; Insani, A.; Adams, S.

2014-09-01

40

Thermal and structural characterization of erbium-doped borosilicate fibers with low silica content containing various amounts of P2O5 and Al2O3  

NASA Astrophysics Data System (ADS)

We report results on the processing and characterization of different glass preforms and single core fibers within the SiO2-Na2O-B2O3-Er2O3-P2O5-Al2O3 system. Micro-Raman spectroscopy was used to identify post-draw structural modification. The differences in the micro-Raman spectra recorded on the preform and on the fiber glass were attributed to a change in the structure induced by the drawing process. Changes in the silicate network organization and small scale molecular orientation within the glass matrix are suspected to occur during the fiber drawing process. We found that the extent in the changes between the preform and fiber properties depend on the glass composition. The glass network of the Al-containing fiber is expected to be less sensitive to the drawing process than that of the fiber matrix as the network of this Al-containing fiber is formed by a larger number of Si-BO units in the network and neutral three-coordinated boron compared to the network of the fiber matrix. From the micro-Raman spectra, formation of small crystals is suspected to occur in the P-containing glasses during the fiber drawing process. The resulting fibers were found to have propagation losses at 1330 nm and Er3+ absorption between (7 ± 1) and (25 ± 1) dB/m and (36 ± 1) and (47 ± 1) dB/m, respectively, depending on the glass composition.

Bourhis, Kevin; Shpotyuk, Yaroslav; Massera, Jonathan; Aallos, Ville; Jouan, Thierry; Boussard-Plédel, Catherine; Bureau, Bruno; Petit, Laeticia; Koponen, Joona; Hupa, Leena; Hupa, Mikko; Ferraris, Monica

2014-11-01

41

Influence of fluoride additions on biological and mechanical properties of Na2O-CaO-SiO2-P2O5 glass-ceramics.  

PubMed

Two series of Na2O-CaO-SiO2-P2O5 glass-ceramics doped with NH4HF2 (G-NH4HF2) or CaF2 (G-CaF2) have been prepared by sol-gel method. The glass-ceramic phase composition and morphology were characterized by X-ray diffraction (XRD) and scanning electron microscopy coupled with energy dispersive spectroscopy (SEM-EDS). The mechanical properties and thermal expansion coefficient were measured by a microhardness tester, an electronic tensile machine and a thermal expansion coefficient tester. The structure difference between these two glass-ceramics was investigated by Fourier transform infrared spectroscopy (FTIR), and the in vitro bioactivity of the glass-ceramics was determined by in vitro simulated body fluid (SBF) immersion test. The hemolysis test, in vitro cytotoxicity test, systemic toxicity test and the implanted experiment in animals were used to evaluate the biocompatibility of the glass-ceramics. The mechanical properties of sample G-NH4HF2 are lower than that of sample G-CaF2, and the bioactivity of sample G-NH4HF2 is better than that of sample G-CaF2. The thermal expansion coefficients of these two glass-ceramics are all closer to that of Ti6Al4V. After 7 days of SBF immersion, apatites were induced on glass-ceramic surface, indicating that the glass-ceramics have bioactivity. The hemolysis test, in vitro cytotoxicity test and systemic toxicity test demonstrate that the glass-ceramics do not cause hemolysis reaction, and have no toxicity to cell and living animal. The implanted experiment in animals shows that bone tissue can form a good osseointegration with the implant after implantation for two months, indicating that the glass-ceramics are safe to serve as implants. PMID:24411365

Li, H C; Wang, D G; Hu, J H; Chen, C Z

2014-02-01

42

Electrical mobility of silver ion in Ag2O-B2O3-P2O5-TeO2 glasses.  

PubMed

The effect of adding TeO(2) into (100 - x)[0.5Ag(2)O - 0.1B(2)O(3) - 0.4P(2)O(5)] - xTeO(2), with 0-80 mol % TeO(2) glass, on the structural changes and electrical properties has been investigated. DSC and thermodilatomery were used to study their thermal behavior, structure was studied by Raman spectroscopy, and electrical properties have been studied by impedance spectroscopy over a wide temperature and frequency range. The introduction of TeO(2) as a third glass former to the glass network causes the structural transformation from TeO(3) (tp) to TeO(4) (tbp) which contributes to the changes in conductivity. The glasses with low TeO(2) content show only a slow decrease in dc conductivity with addition of TeO(2) due to the increase of the number of nonbridging oxygens, which increases the mobility of Ag(+) ions. The steep decrease in conductivity for glasses containing more than 40 mol % TeO(2) is a result of decrease of the Ag(2)O content and stronger cross-linkage in glass network through the formation of more Te-(eq)O(ax)-Te bonds in TeO(4) tbp units. The glasses obey ac conductivity scaling with respect to temperature, implying that the dynamic process is not temperature dependent. On the other hand, the scaling of the spectra for different glass compositions showed the deviations from the Summerfield scaling because of the local structural disorder which occurs as a result of the structural modifications in the tellurite glass network. PMID:25242657

Sklepi?, Kristina; Vorokhta, Maryna; Mošner, Petr; Koudelka, Ladislav; Moguš-Milankovi?, Andrea

2014-10-16

43

Physicochemical degradation studies of calcium phosphate glass ceramic in the CaO-P2O5-MgO-TiO2 system.  

PubMed

The aim of this work was to evaluate the in vitro degradation behaviour of a 45CaO-37P(2)O(5)-5MgO-13TiO(2) (mol.%) glass ceramic, under two different simulated physiological conditions: normal physiological pH 7.4, and pH 3.0, which was designed to simulate the acidic conditions produced by osteoclast cells. The in vitro testing was carried out at 37 degrees C for up to 42 days for the pH 7.4 solution and for up to 1 day for the pH 3.0 solution. The incorporation of TiO(2) into the glass structure leads to the precipitation of specific crystalline phases in the glass matrix, namely alpha- and beta-Ca(2)P(2)O(7), TiP(2)O(7) and CaTi(4)(PO(4))(6). The degradation testing at pH 3.0 showed a higher weight loss compared with degradation testing at pH 7.4; the weight loss under the acidic condition after 1 day (24 h) was about 10 times higher than the weight loss after 42 days of immersion at pH 7.4. The ionic release profile of Ca(2+), PO(4)(3-), Mg(2+) and Ti(4+) showed a continuous increase in concentration over all immersion times for both testing solutions. After 1 day of immersion at pH 3.0, the concentration levels of Mg(2+), Ca(2+), PO(4)(3-) were about six times higher than the levels achieved after 42 days of immersion at pH 7.4. The glass ceramic showed similar degradation to hydroxyapatite, and therefore has potential to be used in certain clinical applications where relatively slow resorption of the implant and replacement by bone is required, e.g. cranioplasty. PMID:17150421

Dias, A G; Gibson, I R; Santos, J D; Lopes, M A

2007-03-01

44

Luminescence properties of Nd 3+: TeO 2-B 2O 3-P 2O 5-Li 2O glass  

NASA Astrophysics Data System (ADS)

An IR transmitting circular glass window of Nd 3+-doped borophosphate-tellurite system in the following chemical composition (mol%) was prepared: 65TeO 2+12B 2O 3+12P 2O 5+10Li 2O+1Nd 2O 3. For this Nd 3+-doped (heavy metal glass) optical material, besides the determination of density and refractive indices, an absorption spectrum (350-3200 nm) at 300 K was obtained. Based on the estimated refractive indices ( nF, nd and nC) at three different wavelengths (486.1, 589.1 and 656.3 nm), the glass dispersive power ( vd) and non-linearity characteristic factors ( n2, ?) were examined. Parameterization of the elastic constants of this glass was done from the measurement of longitudinal and shear velocities. From the measured absorption band positions, energy level structure ( E k,F k,? 4 f,?,?,?, ?¯ and ?%) parameters and from the recorded spectral profiles, oscillator strengths were computed. Both the measured and computed band energies are correlated satisfactorily with an rms deviation of ±89 cm -1. By applying the Judd-Ofelt parameterization, the radiative ( A, AT, TR) factors of the luminescent transitions ( 4F3/2? 4I13/2,11/2,9/2) of the glass were evaluated. Temperature dependent luminescence spectral analyses were carried out in the temperature range of 10-300 K to understand the fluorescence efficiency of a prominent lasing transition ( 4F3/2? 4I11/2) at 1.06 ?m and for the other two transitions ( 4F3/2? 4I9/2, I13/2) at 0.89 and 1.33 ?m as well.

Rao, T. V. R.; Reddy, R. R.; Nazeer Ahammed, Y.; Parandamaiah, M.; Sooraj Hussain, N.; Buddhudu, S.; Purandar, K.

2000-08-01

45

Evaluation of CaO-SiO2-P2O5-Na2O-Fe2O3 bioglass-ceramics for hyperthermia application.  

PubMed

Magnetic bioglass ceramics (MBC) are being considered for use as thermoseeds in hyperthermia treatment of cancer. While the bioactivity in MBCs is attributed to the formation of the bone minerals such as crystalline apatite, wollastonite, etc. in a physiological environment, the magnetic property arises from the magnetite [Fe3O4] present in these implant materials. A new set of bioglasses with compositions 41CaO x (52-x)SiO2 x 4P2O5 x xFe2O3 x 3Na2O (2 < or = x < or = 10 mol% Fe2O3) have been prepared by melt quenching method. The as-quenched glasses were then heat treated at 1050 degrees C for 3 h to obtain the glass-ceramics. The structure and microstructure of the samples were characterized using X-ray diffraction and microscopy techniques. X-ray diffraction data revealed the presence of magnetite in the heat treated samples with x > or = 2 mol% Fe2O3. Room temperature magnetic property of the heat treated samples was investigated using a Vibrating Sample Magnetometer. Field scans up to 20 kOe revealed that the glass ceramic samples had a high saturation magnetization and low coercivity. Room temperature hysteresis cycles were also recorded at 500 Oe to ascertain the magnetic properties at clinically amenable field strengths. The area under the magnetic hysteresis loop is a measure of the heat generated by the MBC. The coercivity of the samples is another important factor for hyperthermia applications. The area under the loop increases with an increase in Fe2O3 molar concentration and the. coercivity decreases with an increase in Fe2O3 molar concentration The evolution of magnetic properties in these MBCs as a function of Fe2O3 molar concentration is discussed and correlated with the amount of magnetite present in them. PMID:18560766

Singh, Rajendra Kumar; Srinivasan, A; Kothiyal, G P

2009-12-01

46

Heat treatment of Na2O-CaO-P2O5-SiO2 bioactive glasses: densification processes and postsintering bioactivity.  

PubMed

Because of their excellent bioactivity, bioactive glasses are increasingly diffused to produce biomedical devices for bone prostheses, to face the dysfunctions that may be caused by traumatic events, diseases, or even natural aging. However, several processing routes, such as the production of scaffolds or the deposition of coatings, include a thermal treatment to apply or sinter the glass. The exposure to high temperature may induce a devetrification phenomenon, altering the properties and, in particular, the bioactivity of the glass. The present contribution offers an overview of the thermal behavior and properties of two glasses belonging to the Na2O-CaO-P2O5-SiO2 system, to be compared to the standard 45S5 Bioglass(®). The basic goal is to understand the effect of both the original composition and the thermal treatment on the performance of the sintered glasses. The new glasses, the one (BG_Na) with a high content of Na2O, the other (BG_Ca) with a high content of CaO, were fully characterized and sintering tests were performed to define the most interesting firing cycles. The sintered samples, treated at 880°C and 800°C respectively, were investigated from a microstructural point of view and their mechanical properties were compared to those of the bulk (not sintered) glass counterparts. The effect of sintering was especially striking on the BG_Ca material, whose Vickers hardness increased from 598.9 ± 46.7 HV to 1053.4 ± 35.0 HV. The in vitro tests confirmed the ability of the glasses, both in bulk and sintered form, of generating a hydroxyapatite surface layer when immersed in a simulated body fluid. More accurate biological tests performed on the sintered glasses proved the high bioactivity of the CaO-rich composition even after a heat treatment. PMID:22052581

Sola, A; Bellucci, D; Raucci, M G; Zeppetelli, S; Ambrosio, L; Cannillo, V

2012-02-01

47

Spectral analysis of RE 3+ (RE = Sm, Dy, and Tm): P 2O 5-Al 2O 3-Na 2O glasses  

NASA Astrophysics Data System (ADS)

Phosphate glasses in the compositions of 70P 2O 5-15Al 2O 3-14Na 2O-1RE 3+ (RE = Sm, Dy, and Tm) (mol%) were prepared by melt-quenching technique and characterized optically. The differential thermal analysis (DTA) profile of the host glass was carried out to confirm its thermal stability. For all the glasses absorption, photoluminescence and decay measurements have also been carried out. These glasses have shown strong emission and absorption bands in visible and near-infrared (NIR) region. From the measured absorption spectra, Judd-Ofelt (J-O) intensity parameters ( ?2, ?4 and ?6) have been calculated for all the studied ions. For Sm 3+ doped glass, four emission bands centered at 562 nm ( 4G 5/2 ? 6H 5/2), 598 nm ( 4G 5/2 ? 6H 7/2), 644 nm ( 4G 5/2 ? 6H 9/2), and 704 nm ( 4G 5/2 ? 6H 11/2) have been observed with 402 nm ( 6H 5/2 ? 4F 7/2) excitation wavelength. Of them, 598 nm ( 4G 5/2 ? 6H 7/2) has shown a bright orange emission. With regard to Dy 3+ doped glass, a blue emission band centered at 486 nm ( 4F 9/2 ? 6H 15/2) and a bright yellow emission at 575 nm ( 4F 9/2 ? 6H 13/2) have been observed, apart from 662 nm ( 4F 9/2 ? 6H 11/2) emission transition with an excitation at 388 nm ( 6H 15/2 ? 4I 13/2, 4F 7/2) wavelength. Emission bands of 650 nm ( 1G 4 ? 3F 4) and 785 nm ( 1G 4 ? 3H 5) transitions for the Tm 3+ doped glass, with an excitation wavelength at 466 nm ( 3H 6 ? 1G 4), have also been observed. The stimulated emission cross-sections of all the emission bands of RE 3+ glasses (RE = Sm, Dy, and Tm) have been computed based on their measured full-width at half maximum (FWHM, ??) and measured lifetimes ( ? m).

Lakshminarayana, G.; Yang, Rong; Mao, Mengfei; Qiu, Jianrong

2009-08-01

48

Luminescence properties of Sm(3+)-doped P(2)O(5)-PbO-Nb(2)O(5) glass under high pressure.  

PubMed

Samarium doped lead phosphate glass modified with niobium having a composition (in mol%) of 55P(2)O(5)+39.5PbO+5Nb(2)O(5)+0.5Sm(2)O(3) has been prepared by the conventional melt quenching technique. The emission spectra and the decay curves for the (4)G(5/2) level of Sm(3+) ions have been measured as a function of pressure up to 23.6 GPa at room temperature. A discontinuity in the observed shifts and crystal-field splittings as a function of pressure around 9-10 GPa suggests that a phase transition is taking place in the glass matrix. The [Formula: see text], (6)H(7/2) and (6)H(9/2) transitions are shifted towards the lower energy side with magnitudes of -7.1, -7.6 and -5.5 cm(-1) GPa(-1) up to 8.9 GPa (phase 1) and -5.6, -4.9 and -4.4 cm(-1) GPa(-1) beyond 10.3 GPa (phase 2), respectively. A much stronger increase in the splitting of the [Formula: see text] and [Formula: see text] Stark levels with pressure is observed in phase 1 than in phase 2. The lifetime of the (4)G(5/2) level decreases from 2.29 ms (0 GPa) to 0.64 ms (23.6 GPa) with pressure. The decay curves of the (4)G(5/2) level exhibit non-exponential behavior for all the pressures and were fitted by the generalized Yokota-Tanimoto model to probe the nature of the energy transfer process. The best fits with S = 6 indicate that the energy transfer between donor and acceptor is of dipole-dipole type. The crystal-field splitting experienced by the Sm(3+) ions in the title glass are found to be larger than those found in borate, K-Ba-Al phosphate and tellurite glasses. PMID:21817267

Praveena, R; Venkatramu, V; Babu, P; Jayasankar, C K; Tröster, Th; Sievers, W; Wortmann, G

2009-01-21

49

Compositional and microstructural design of highly bioactive P2O5-Na2O-CaO-SiO2 glass-ceramics.  

PubMed

Bioactive glasses having chemical compositions between 1Na(2)O-2CaO-3SiO(2) (1N2C3S) and 1.5Na(2)O-1.5CaO-3SiO(2) (1N1C2S) containing 0, 4 and 6 wt.% P(2)O(5) were crystallized through two stage thermal treatments. By carefully controlling these treatments we separately studied the effects on the mechanical properties of two important microstructural features not studied before, crystallized volume fraction and crystal size. Fracture strength, elastic modulus and indentation fracture toughness were measured as a function of crystallized volume fraction for a constant crystal size. Glass-ceramics with a crystalline volume fraction between 34% and 60% exhibited a three-fold improvement in fracture strength and an increase of 40% in indentation fracture toughness compared with the parent glass. For the optimal crystalline concentration (34% and 60%) these mechanical properties were then measured for different grain sizes, from 5 to 21 ?m. The glass-ceramic with the highest fracture strength and indentation fracture toughness was that with 34% crystallized volume fracture and 13 ?m crystals. Compared with the parent glass, the average fracture strength of this glass-ceramic was increased from 80 to 210 MPa, and the fracture toughness from 0.60 to 0.95 MPa.m(1/2). The increase in indentation fracture toughness was analyzed using different theoretical models, which demonstrated that it is due to crack deflection. Fortunately, the elastic modulus E increased only slightly; from 60 to 70 GPa (the elastic modulus of biomaterials should be as close as possible to that of cortical bone). In summary, the flexural strength of our best material (215 MPa) is significantly greater than that of cortical bone and comparable with that of apatite-wollastonite (A/W) bioglass ceramics, with the advantage that it shows a much lower elastic modulus. These results thus provide a relevant guide for the design of bioactive glass-ceramics with improved microstructure. PMID:22032913

Peitl, Oscar; Zanotto, Edgar D; Serbena, Francisco C; Hench, Larry L

2012-01-01

50

Raman Study of xMeO · (100-x)[P2O5 · CaO] (MeO=Fe2O3, V2O5 or (Fe2O3 · V2O5)) Glass Systems  

NASA Astrophysics Data System (ADS)

Glasses from xMeO · (100-x)[P2O5 · CaO], (MeO=Fe2O3, V2O5 or (Fe2O3 · V2O5)) were prepared and investigated using Raman scattering spectroscopy, over compositional range x=0-50% mol. The influence of Fe2O3, V2O5 or (Fe2O3·V2O5) content on the structure of P2O5·CaO glass matrix was followed. The addition of Fe2O3, V2O5 or (Fe2O3·V2O5) determines the modification of the structure of the studied glasses. The Raman spectra of xFe2O3(100-x)[P2O5·CaO] do not present any absorption bands characteristic to Fe2O3 but its evolution is dependent on the iron content. The Raman spectra of xV2O5·(100-x)[P2O5·CaO] present, besides the bands specific for the matrix, some bands assigned to characteristic vibrations of V-O bonds which are evidenced only for high content of V2O5. The evolution of the spectra is dependent on V2O5 content. The Raman spectra of x(Fe2O3·V2O5)·(100-x)[P2O5·CaO] system showed that phosphate units are the main structural units of the glass system, iron and vanadium ions are located in the network. The increasing of iron and vanadium content indicate a gradual decrease in the number of bridging oxygen ions and an increase in the number of non-bridging oxygen ions.

Andronache, Constantin

51

Role of CaO addition in the local order around Erbium in SiO2GeO2P2O5 fiber preforms F. d'Acapito C. Maurizio  

E-print Network

properties of erbium ions. To our knowledge only few studies on nano-structured silica fibers were dedicatedRole of CaO addition in the local order around Erbium in SiO2­GeO2­P2O5 fiber preforms F. d in present technology. In this contribution we present a study on Er-doped fiber preforms where particular

Boyer, Edmond

52

Formation of hydroxyapatite onto glasses of the CaO-MgO-SiO2 system with B2O3, Na2O, CaF2 and P2O5 additives.  

PubMed

New bioactive glasses with compositions based on the CaO-MgO-SiO(2) system and additives of B(2)O(3), P(2)O(5), Na(2)O, and CaF(2) were prepared. The in vitro mineralization behaviour was tested by immersion of powders or bulk glasses in simulated body fluid (SBF). Monitoring of ionic concentrations in SBF and scanning electron microscopy (SEM) observations at the surface of the glasses were conducted over immersion time. Raman and infrared (IR) spectroscopy shed light on the structural evolution occurring at the surface of the glasses that leads to formation of hydroxyapatite. PMID:16309741

Agathopoulos, S; Tulyaganov, D U; Ventura, J M G; Kannan, S; Karakassides, M A; Ferreira, J M F

2006-03-01

53

Understanding the composition-structure-bioactivity relationships in diopside (CaO·MgO·2SiO2)-tricalcium phosphate (3CaO·P2O5) glass system.  

PubMed

The present work is an amalgamation of computation and experimental approach to gain an insight into composition-structure-bioactivity relationships of alkali-free bioactive glasses in the CaO-MgO-SiO2-P2O5 system. The glasses have been designed in the diopside (CaO·MgO·2SiO2; Di)-tricalcium phosphate (3CaO·P2O5; TCP) binary join by varying the Di/TCP ratio. The melt-quenched glasses have been investigated for their structure by molecular dynamic (MD) simulations as well as by nuclear magnetic resonance spectroscopy (NMR). In all the investigated glasses silicate and phosphate components are dominated by Q(2) (Si) and Q(0) (P) species, respectively. The apatite forming ability of the glasses was investigated using X-ray diffraction (XRD), infrared spectroscopy after immersion of glass powders in simulated body fluid (SBF) for time durations varying between 1h and 14days, while their chemical degradation has been studied in Tris-HCl in accordance with ISO 10993-14. All the investigated glasses showed good bioactivity without any substantial variation. A significant statistical increase in metabolic activity of human mesenchymal stem cells (hMSCs) when compared to the control was observed for Di-60 and Di-70 glass compositions under both basal and osteogenic conditions. PMID:25578990

Kapoor, Saurabh; Semitela, Ângela; Goel, Ashutosh; Xiang, Ye; Du, Jincheng; Lourenço, Ana H; Sousa, Daniela M; Granja, Pedro L; Ferreira, José M F

2015-03-01

54

Features of the local structural disorder in Li 2O-CaF 2-P 2O 5 glass-ceramics with Cr 2O 3 as nucleating agent  

NASA Astrophysics Data System (ADS)

Li 2O-CaF 2-P 2O 5 glasses mixed with different concentrations of Cr 2O 3 (ranging from 0 to 1.0 mol%) were crystallized. The samples were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy (EDS), differential thermal analysis and conventional spectroscopic techniques. The X-ray diffraction and scanning electron microscopic studies reveal the presence of lithium phosphate, calcium phosphate and chromium phosphate (complexes of Cr 3+, Cr 5+ and Cr 6+ ions) crystal phases. The study on DTA suggests that the crystallization is predominantly due to the surface crystallization when the concentration of nucleating agent Cr 2O 3 is around 0.8 mol%. The IR and Raman spectral studies of these samples indicate that the sample crystallized with 0.8 mol% Cr 2O 3 is more compact and possesses high rigidity due to the presence of chromium ions largely in tetrahedral positions.

Murali Krishna, G.; Gandhi, Y.; Venkatramaiah, N.; Venkatesan, R.; Veeraiah, N.

2008-03-01

55

Thermophysical Properties of Ceramic Filler-Added BaO-ZnO-B2O3-P2O5 Glass Composites for Barrier Ribs of Plasma Display Panels  

NASA Astrophysics Data System (ADS)

The capability of BaO-ZnO-B2O3-P2O5 glass in hosting various ceramic fillers (up to 20 mass% of Al2O3, TiO2, and ZnO) has been investigated. All the investigated filler-added glasses have demonstrated a reasonable densification at 550 °C to form stable ceramic filler-glass composites. Modifications of the thermophysical properties, such as coefficient of thermal expansion (CTE), glass transition temperature, and dilatometric softening temperature, by the addition of the fillers have been investigated and correlated to phase and microstructural evolution. The CTE of the fabricated composites with varying filler addition is well correlated with theoretical predictions based on the Turner equation considering the modification by phase evolution, which indicates the thermal property tuning potential of the BZBP-based glass composites for application to barrier ribs of plasma display panels.

Chong, Eugene; Hwang, Seongjin; Sung, Wookyung; Shin, Hyunho; Kim, Hyungsun

2010-10-01

56

Effect of pH values on surface modification and solubility of phosphate bioglass-ceramics in the CaO-P 2O 5-Na 2O-SrO-ZnO system  

NASA Astrophysics Data System (ADS)

The bioactive glass-ceramics in the CaO-P 2O 5-Na 2O-SrO-ZnO system were synthesized by the sol-gel technique, and then chemically treated at different pH values to study the solubility and surface modification. Samples sintered at 650 °C for 4 h consisted of the crystalline phase ?-Ca 2P 2O 7 and the glass matrix. After soaking in the solution at pH 1.0, the residual glass matrix on the surface appeared entirely dissolved and no new phase could be detected. Whereas at pH 3.0, web-like layer exhibiting peaks corresponding to CaP 2O 6 was formed and covered the entire surface of the sample. When conducted at pH 10.0, only part of the glass matrix was dissolved and a new phase Ca 4P 6O 19 was precipitated, forming the petaline layer. The chemical treatment can easily change the surface morphologies and phase composition of this bioactive glass-ceramics. The higher level of surface roughness resulting from the new-formed layer would improve the interface bonding and benefit for cell adhesion.

Li, Xudong; Cai, Shu; Zhang, Wenjuang; Xu, Guohua; Zhou, Wei

2009-08-01

57

UV spectroscopy, refractive indices and elastic properties of the (76 - x) TeO2·9P2O5·15ZnO·xLiNbO3 glass  

NASA Astrophysics Data System (ADS)

Tellurite glass with composition (76 - x) TeO2·9P2O5·15ZnO·xLiNbO3 (where x = 12.5, 25, 30 and 35 in mol%) have been prepared by melt-quenching method. The optical properties of the glass were estimated by measuring UV-VIS spectroscopy and refractive indices at different wavelength. From the absorption edge studies, the optical energy gap (Eopt) and Urbach energy (?E) has been evaluated. Moreover mechanical properties with structural properties of the glasses were investigated by measuring both longitudinal and shear velocities by using the pulse-echo overlap technique at 5 MHz. The elastic moduli such as: longitudinal (?), shear (?), bulk (B) and Young's (Y) increase with the increase in LiNbO3 content in the prepared glasses matrix. The different physical parameters such as density, molar volume, oxygen molar volume, oxygen packing density, molar polarizability, Debye temperature, microhardness, Poisson's ratio, kinetic fragility and fractal bond connectivity have been computed and were found to depend on the glass composition.

Yousef, El Sayed; Al-Qaisi, Badriah

2013-05-01

58

Understanding the magnetic behavior of heat treated CaO-P2O5-Na2O-Fe2O3-SiO2 bioactive glass using electron paramagnetic resonance studies  

NASA Astrophysics Data System (ADS)

Bioactive glass of composition 41CaO-44SiO2-4P2O5-8Fe2O3-3Na2O has been heat treated in the temperature (TA) range of 750-1150 °C for time periods (tA) ranging from 1 h to 3 h to yield magnetic bioactive glass ceramics (MBCs). X-ray diffraction studies indicate the presence of bone mineral (hydroxyapatite and wollastonite) and magnetic (magnetite and ?-hematite) phases in nanocrystalline form in the MBCs. Electron paramagnetic resonance (EPR) study was carried out to understand the variation in saturation magnetization and coercivity of the MBCs with TA and tA. These studies reveal the nature and amount of iron ions present in the MBCs and their interaction in the glassy oxide matrix as a function of annealing parameters. The deterioration in the magnetic properties of the glass heat treated above 1050 °C is attributed to the crystallization of the non-magnetic ?-hematite phase. These results are expected to be useful in the application of these MBCs as thermoseeds in hyperthermia treatment of cancer.

Shankhwar, Nisha; Kothiyal, G. P.; Srinivasan, A.

2014-09-01

59

Influences of TiO2 Addition on the Crystallization Behavior, Microstructure, and Magnetic Properties of Li2O-MnO2-Fe2O3-CaO-P2O5-SiO2 Glasses  

NASA Astrophysics Data System (ADS)

Influences of TiO2 addition on the phase transformation, microstructure, and magnetic properties of Li2O-MnO2-Fe2O3-CaO-P2O5-SiO2 (LMFCPS) glass have been studied using DTA, XRD, SEM, EDS, TEM, SAED, and SQUID. When LMFCPS glass, with and without TiO2 content, is crystallized at 1123 K (850 °C) for 2 hours, the magnetite (FeFe2O4), ?-wollastonite (?-CaSiO3), lithium orthophosphate (Li3PO4), and triphylite (Li(Mn0.5Fe0.5)PO4) phases are formed. The ?-wollastonite and lithium silicate formed with evident directionality were observed in the LMFCPS glass-ceramics without adding TiO2. However, when the LMFCPS glass with various TiO2 content is crystallized at 1123 K (850 °C) for 16 hours, very small remnant magnetic induction and coercive field hysteresis loops were found showing the ferromagnetic property in a magnetic field smaller than 2000 Oe. Additionally, when LMFCPS glass with various TiO2 contents is crystallized at 1123 K (850 °C) for 16 hours, the glass-ceramics showed super-paramagnetic property in a magnetic field of 60 kOe due to the small grains of the iron-rich phases.

Cheng, Huy-Zu; Lin, Huey-Jiuan; Wang, Moo-Chin; Wang, Chien-Fa; Hsi, Chi-Shiung; Zhao, XiuJian; Jiang, Hong; Li, Chang-Jiu; Lu, Peng

2015-03-01

60

Effects of sodium and potassium ions on a novel SeO2-B2O3-SiO2-P2O5-CaO bioactive system  

NASA Astrophysics Data System (ADS)

The study is focused on Na2O and/or K2O influence on a new sol-gel derived SeO2-B2O3-SiO2-P2O5-CaO bioactive system. The structural changes induced by Na2O and/or K2O addition were correlated with the samples behavior in simulated biological media. X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy were used to characterize the structure and the type of the chemical bonds. The morphology of the samples was characterized through scanning electron microscopy (SEM). XRD results pointed out a prevalent vitreous structure with an incipient hydroxyapatite (HA) crystalline phase. FTIR results revealed a complex network consisting of silicate, phosphate and borate units, as well as the development of both A- and B-type of carbonate-substituted HA. The bioactivity of the samples was tested in vitro following the evolution of the apatite layers self-assembled on the samples surface in simulated body fluid. Their biocompatibility was investigated after samples surface functionalization with protein. The results indicate that sodium and potassium addition improves the biocompatibility by enhancement of protein adherence on samples surface and without to prevent the samples bioactivity.

Trandafir, D. L.; Ponta, O.; Ciceo-Lucacel, R.; Simon, V.

2015-01-01

61

Optical and fluorescence spectroscopy of Eu2O3-doped P2O5-K2O-KF-MO-Al2O3 (M = Mg, Sr and Ba) glasses  

NASA Astrophysics Data System (ADS)

Fluorophosphate glasses of composition, P2O5 + K2O + KF + MO + Al2O3 + xEu2O3 (M = Mg, Sr and Ba; x = 0.01, 0.05, 0.1, 1.0, 2.0, 4.0 and 6.0 mol%) were prepared and characterized their optical properties. Crystal-field (CF) analysis revealed a relatively weak CF strength around Eu3+ ions in the Ba based fluorophosphate glasses. The Judd-Ofelt parameters have been estimated from the oscillator strengths of 7F0 ? 5D2, 7F0 ? 5D4 and 7F0 ? 5L6 absorption transitions of Eu3+ ions and were used to evaluate the radiative properties of the 5D0 ? 7FJ (J = 0-4) transitions. Considerable variation has been observed in the relative intensity ratio of 5D0 ? 7F2 to 5D0 ? 7F1 transitions of Eu3+ ions due to change in the alkaline earth metal ions. The decay of the 5D0 level shows single exponential and less sensitive to Eu3+ ions concentration as well as MgO/SrO/BaO modifiers.

Kumar, K. Upendra; Babu, S. Surendra; Rao, Ch. Srinivasa; Jayasankar, C. K.

2011-06-01

62

Synthesis, cytotoxicity, and hydroxyapatite formation in 27-Tris-SBF for sol-gel based CaO-P2O5-SiO2-B2O3-ZnO bioactive glasses  

PubMed Central

CaO-P2O5-SiO2-B2O3-ZnO bioactive glasses were prepared via an optimized sol–gel method. The current investigation was focused on producing novel zinc based calcium phosphoborosilicate glasses and to evaluate their mechanical, rheological, and biocompatible properties. The morphology and composition of these glasses were studied using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The particle size, mechanical and flexural strength was also determined. Furthermore, the zeta potential of all the glasses were determined to estimate their flocculation tendency. The thermal analysis and weight loss measurements were carried out using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) respectively. For assessing the in-vitro bioactive character of synthesized glasses, the ability for apatite formation on their surface upon their immersion in simulated body fluid (SBF) was checked using SEM and pH measurements. MTS assay cytotoxicity assay and live-dead cell viability test were conducted on J774A.1 cells murine macrophage cells for different glass concentrations. PMID:24637634

Kaur, Gurbinder; Pickrell, G.; Kimsawatde, G.; Homa, D.; Allbee, H. A.; Sriranganathan, N.

2014-01-01

63

Effect of ZrO(2) additions on the crystallization, mechanical and biological properties of MgO-CaO-SiO(2)-P(2)O(5)-CaF(2) bioactive glass-ceramics.  

PubMed

A series of ZrO(2) doped MgO-CaO-SiO(2)-P(2)O(5)-CaF(2) bioactive glass-ceramics were obtained by sintering method. The crystallization behavior, phase composition, morphology and structure of glass-ceramics were characterized. The bending strength, elastic modulus, fracture toughness, micro-hardness and thermal expansion coefficient (TEC) of glass-ceramics were investigated. The in vitro bioactivity and cytotoxicity tests were used to evaluate the bioactivity and biocompatibility of glass-ceramics. The sedimentation mechanism and growth process of apatites on sample surface were discussed. The results showed that the mainly crystalline phases of glass-ceramics were Ca(5)(PO4)3F (fluorapatite) and ?-CaSiO(3). (?-wollastonite). m-ZrO(2) (monoclinic zirconia) declined the crystallization temperatures of glasses. t-ZrO(2) (tetragonal zirconia) increased the crystallization temperature of Ca(5)(PO4)(3)F and declined the crystallization temperature of ?-CaSiO(3). t-ZrO(2) greatly increased the fracture toughness, bending strength and micro-hardness of glass-ceramics. The nanometer apatites were induced on the surface of glass-ceramic after soaking 28 days in SBF (simulated body fluid), indicating the glass-ceramic has good bioactivity. The in vitro cytotoxicity test demonstrated the glass-ceramic has no toxicity to cell. PMID:24780435

Li, H C; Wang, D G; Meng, X G; Chen, C Z

2014-06-01

64

Influence of strontium on structure, sintering and biodegradation behaviour of CaO-MgO-SrO-SiO2-P2O5-CaF2 glasses  

SciTech Connect

The present study investigates the influence of SrO on structure, apatite forming ability, physico-chemical degradation and sintering behaviour of melt-quenched bioactive glasses with composition: mol.% (36.07 – x) CaO – x SrO - 19.24 MgO – 5.61 P2O5 – 38.49 SiO2 – 0.59 CaF2, where x varies between 0 – 10. The detailed structural analysis of glasses has been made by infra red spectroscopy (FTIR) and magic angle spinning-nuclear magnetic resonance spectroscopy (MAS-NMR). Silicon was predominantly present as Q2 (Si) species while phosphorus was found in orthophosphate type environment in all the investigated glasses. The apatite forming ability of glasses was investigated by immersion of glass powders in simulated body fluid (SBF) for time durations varying between 1 h – 7 days. While increasing Sr2+/Ca2+ ratio in glasses did not affect the structure of glasses significantly, their apatite forming ability was decreased considerably. Further, physico-chemical degradation of glasses has been studied in accordance with ISO 10993-14 “Biological evaluation of medical devices – Part 14: Identification and quantification of degradation products from ceramics” in Tris HCl and citric acid buffer and the possible implications of ion release profile from glasses in different solutions has been discussed. The addition of strontium in glasses led to a 7-fold decrease in chemical degradation of glasses in Tris-HCl. The sintering of glass powders rendered glass-ceramics (GCs) with varying degree of crystallinity and good flexural strength (98-131 MPa) where the mechanical properties depend on the nature and amount of crystalline phases present in GCs.

Goel, Ashutosh; Rajagopal, Raghu R.; Ferreira, Jose M.

2011-11-01

65

Structural characterization and physical properties of P2O5-CaO-Na2O-TiO2 glasses by Fourier transform infrared, Raman and solid-state magic angle spinning nuclear magnetic resonance spectroscopies.  

PubMed

Phosphate-based glasses have been investigated for tissue engineering applications. This study details the properties and structural characterization of titanium ultra-phosphate glasses in the 55(P(2)O(5))-30(CaO)-(25-x)(Na(2)O)-x(TiO(2)) (0?x?5) system, which have been prepared via melt-quenching techniques. Structural characterization was achieved by a combination of X-ray diffraction (XRD), and solid-state nuclear magnetic resonance, Raman and Fourier transform infrared spectroscopies. Physical properties were also investigated using density, degradation and ion release studies; additionally, differential thermal analysis was used for thermal analysis of these glasses. The results show that with the addition of TiO(2) the density and glass transition temperature increased whereas the degradation and ion release properties are decreased. From XRD data, TiP(2)O(7) and CaP(2)O(6) were detected in 3 and 5 mol.% TiO(2)-containing glasses. Magic angle spinning nuclear magnetic resonance results confirmed that as TiO(2) is incorporated into the glass; the amount of Q(3) increases as the amount of Q(2) consequently decreases, indicating increasing polymerization of the phosphate network. Spectroscopy results also showed that the local structure of glasses changes with increasing TiO(2) content. As TiO(2) is incorporated into the glass, the phosphate connectivity increases, indicating that the addition of TiO(2) content correlates unequivocally with an increase in glass stability. PMID:21930253

Kiani, Azadeh; Hanna, John V; King, Scott P; Rees, Gregory J; Smith, Mark E; Roohpour, Nima; Salih, Vehid; Knowles, Jonathan C

2012-01-01

66

Sol-Gel Synthesis and Electrospraying of Biodegradable (P2O5)55-(CaO)30-(Na2O)15 Glass Nanospheres as a Transient Contrast Agent for Ultrasound Stem Cell Imaging.  

PubMed

Ultrasound imaging is a powerful tool in medicine because of the millisecond temporal resolution and submillimeter spatial resolution of acoustic imaging. However, the current generation of acoustic contrast agents is primarily limited to vascular targets due to their large size. Nanosize particles have the potential to be used as a contrast agent for ultrasound molecular imaging. Silica-based nanoparticles have shown promise here; however, their slow degradation rate may limit their applications as a contrast agent. Phosphate-based glasses are an attractive alternative with controllable degradation rate and easily metabolized degradation components in the body. In this study, biodegradable P2O5-CaO-Na2O phosphate-based glass nanospheres (PGNs) were synthesized and characterized as contrast agents for ultrasound imaging. The structure of the PGNs was characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), (31)P magic angle spinning nuclear magnetic resonance ((31)P MAS NMR), and Fourier transform infrared (FTIR) spectroscopy. The SEM images indicated a spherical shape with a diameter size range of 200-500 nm. The XRD, (31)P NMR, and FTIR results revealed the amorphous and glassy nature of PGNs that consisted of mainly Q(1) and Q(2) phosphate units. We used this contrast to label mesenchymal stem cells and determined in vitro and in vivo detection limits of 5 and 9 ?g/mL, respectively. Cell counts down to 4000 could be measured with ultrasound imaging with no cytoxicity at doses needed for imaging. Importantly, ion-release studies confirmed these PGNs biodegrade into aqueous media with degradation products that can be easily metabolized in the body. PMID:25625373

Foroutan, Farzad; Jokerst, Jesse V; Gambhir, Sanjiv S; Vermesh, Ophir; Kim, Hae-Won; Knowles, Jonathan C

2015-02-24

67

Fabrication and evaluation of osteoblastic differentiation of human mesenchymal stem cells on novel CaO-SiO2-P2O5-B2O3 glass-ceramics.  

PubMed

Apatite-wollastonite glass-ceramics have high mechanical strength, and CaO-SiO2 -B2 O3 glass-ceramics showed excellent bioactivity and high biodegradability. A new type of CaO-SiO2 -P2 O5 -B2 O3 system of bioactive glass-ceramics (BGS-7) was fabricated, and the effect and usefulness was evaluated via bioactivity using simulated body fluid and human mesenchymal stem cells (hMSCs). The purpose of this study was to compare BGS-7 and hydroxyapatite (HA) using hMSCs in order to evaluate the bioactivity of BGS-7 and its possibility as a bone graft extender. Alkaline phosphatase (ALP) staining, ALP activity, cell proliferation 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium, inner salt (MTS) assay, Alizarin Red-S (AR-S) staining, calcium levels, the mRNA expression of ALP, osteocalcin, osteopontin, and runt-related transcription factor 2 (runx-2) using reverse-transcription polymerase chain reaction (RT-PCR) and the protein expression of osteocalcin and runx-2 using Western blot were measured by transplanting hMSC onto a tissue culture plate, HA, and BGS-7. The ALP staining and AR-S staining of BGS-7 was greater than that of HA and control. The ALP value of BGS-7 was significantly higher than that of HA and control. The MTS results showed that BGS-7 had a higher value than the groups transplanted onto HA and control on day 15. The calcium level was higher than the control in both HA and BGS-7, and was especially high in BGS-7. There were more mineral products on BGS-7 than on the HA when analyzed by scanning electron microscopy. The mRNA expression of ALP, osteopontin, osteocalcin, and runx-2 were higher on BGS-7 than on HA and the control when analyzed by RT-PCR. The relative gene expression of osteopontin and runx-2 were found to be higher on BGS-7 than on HA and the control by Western blot. Accordingly, it is predicted that BGS-7 would have high biocompatibility and good osteoconductivity, and presents a possibility as a new bone graft extender. PMID:23560457

Lee, Jae Hyup; Seo, Jun-Hyuk; Lee, Kyung Mee; Ryu, Hyun-Seung; Baek, Hae-Ri

2013-07-01

68

Structural investigation of vanadium ions doped Li2Osbnd PbOsbnd B2O3sbnd P2O5 glasses by means of spectroscopic and dielectric studies  

NASA Astrophysics Data System (ADS)

In the present investigation we report the synthesis of a series of transparent glasses of composition 20Li2Osbnd 20PbOsbnd 45B2O3sbnd (15-x) P2O5: xV2O5 with eight values of x ranging from 0 to 2.5 mol%, and their characterization. X-ray diffraction (XRD) spectra reflected the amorphous nature of the glasses. Optical absorption, electron paramagnetic resonance (EPR) spectra and FTIR study of vanadyl ions in the present glass network have been analyzed. The optical absorption and EPR investigations have revealed that vanadium ions do exist in both V4+ and V5+ states and the redox ratio (V4+/V5+) is observed to increase with the increase in concentration of V2O5. Dielectric properties viz., dielectric constant ??(?), loss tan ?, electrical moduli M?(?), M?(?), a.c. conductivity ?ac over an extensive scale of frequency and temperature have been investigated as a function of V2O5 concentration. The dispersion of dielectric constant ??(?) with temperature has been interpreted by space charge polarization model. The dielectric loss and electrical moduli variation with frequency and temperature exhibited relaxation effects. These effects are ascribed to V4+ ions. The a.c. conductivity of the prepared glasses is perceived to escalate with the hike in V2O5 concentration whereas the activation energy for conduction exhibits a reverse trend. The conductivity mechanism is explained on the basis of polaronic transfer between V4+ and V5+ ions. The low temperature a.c. conductivity mechanism is elucidated by the quantum mechanical tunneling model. The growth in the values of dielectric parameters with raise in the concentration of V2O5 is due to V4+ ions which act as modifiers. The investigation of these results has indicated that at higher concentrations of V2O5, the VO2+ ions in the glasses were present in octahedral sites with tetragonal compression and belong to C4v symmetry.

Yusub, S.; Narendrudu, T.; Suresh, S.; Krishna Rao, D.

2014-11-01

69

Ionic conductivity of mixed glass former 0.35Na(2)O + 0.65[xB(2)O(3) + (1 - x)P(2)O(5)] glasses.  

PubMed

The mixed glass former effect (MGFE) is defined as a nonlinear and nonadditive change in the ionic conductivity with changing glass former fraction at constant modifier composition between two binary glass forming compositions. In this study, mixed glass former (MGF) sodium borophosphate glasses, 0.35Na2O + 0.65[xB2O3 + (1 - x)P2O5], 0 ? x ? 1, have been prepared, and their sodium ionic conductivity has been studied. The ionic conductivity exhibits a strong, positive MGFE that is caused by a corresponding strongly negative nonlinear, nonadditive change in the conductivity activation energy with changing glass former content, x. We describe a successful model of the MGFE in the conductivity activation energy terms of the underlying short-range order (SRO) phosphate and borate glass former structures present in these glasses. To do this, we have developed a modified Anderson-Stuart (A-S) model to explain the decrease in the activation energy in terms of the atomic level composition dependence (x) of the borate and phosphate SRO structural groups, the Na(+) ion concentration, and the Na(+) mobility. In our revision of the A-S model, we carefully improve the treatment of the cation jump distance and incorporate an effective Madelung constant to account for many body coulomb potential effects. Using our model, we are able to accurately reproduce the composition dependence of the activation energy with a single adjustable parameter, the effective Madelung constant, that changes systematically with composition, x, and varies by no more than 10% from values typical of oxide ceramics. Our model suggests that the decreasing columbic binding energies that govern the concentration of the mobile cations are sufficiently strong in these glasses to overcome the increasing volumetric strain energies (mobility) caused by strongly increasing glass-transition temperatures combined with strongly decreasing molar volumes of these glasses. The dependence of the columbic binding energy term on the relative high-frequency dielectric permittivity suggests that the increased polarizability of the bridging oxygens connecting SRO tetrahedral boron units to phosphorus units causes further charge delocalization away from the negatively charged tetrahedral boron units, leading to a lowering of the charge density, and is the underlying cause of the MGFE. PMID:24295052

Christensen, Randilynn; Olson, Garrett; Martin, Steve W

2013-12-27

70

Structural studies of mixed glass former 0.35Na2O + 0.65[xB2O3 + (1 - x)P2O5] glasses by Raman and 11B and 31P magic angle spinning nuclear magnetic resonance spectroscopies.  

PubMed

The mixed glass former (MGF) effect (MGFE) is defined as a nonlinear and nonadditive change in the ionic conductivity with changing glass former composition at constant modifier composition. In this study, sodium borophosphate 0.35Na(2)O + 0.65[xB(2)O(3) + (1 - x)P(2)O(5)], 0 ? x ? 1, glasses which have been shown to exhibit a positive MGFE have been prepared and examined using Raman and (11)B and (31)P magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopies. Through examination of the short-range order (SRO) structures found in the ternary glasses, it was determined that the minority glass former, B for 0.1 ? x ? 0.7 and P for 0.7 ? x ? 0.9, is "overmodified" and contains more Na(+) ions than would be expected from simple linear mixing of the binary sodium borate, x = 1, and sodium phosphate, x = 0, glasses, respectively. Changes in the intermediate range order (IRO) structures were suggested by changes in the NMR spectral chemical shifts and Raman spectra wavenumber shifts over the full composition range x in the Raman and MAS NMR spectra. The changes observed in the chemical shifts of (31)P MAS NMR spectra with x are found to be too large to be caused solely by changing sodium modification of the phosphate SRO structural groups, and this indicates that internetwork bonding between phosphorus and boron through bridging oxygens (BOs), P-O-B, must be a major contributor to the IRO structure of these glasses. While not fully developed, a first-order thermodynamic analysis based upon the Gibbs free energies of formation of the various SRO structural units in this system has been developed and can be used to account for the preferential formation of tetrahedral boron groups, B(4), by the reaction of B(3) with P(2) groups to form B(4) and P(3) groups, respectively, where the superscript denotes the number of BOs on these units, in these glasses. This preference for B(4) units appears to be a predominate cause of the changing modifier to glass former ratio with composition x in these ternary MGF glasses and appears to be associated with the large negative value of the Gibbs free energy of formation of this group. PMID:23281937

Christensen, Randilynn; Olson, Garrett; Martin, Steve W

2013-02-21

71

Reflexión bioética sobre el uso de organismos genéticamente modificados  

PubMed Central

El presente artículo reflexiona desde los 4 principios de la bioética el uso comercial de organismos genéticamente modificados. Se cuestiona fundamentalmente la falta de transferencia de tecnología entre el mundo desarrollado y en desarrollo y el que el presente sistema de patentamiento de organismos vivos modificados fomenta intereses comerciales y no da debida importancia al desarrollo sostenible de la agricultura y ganadería en los países en desarrollo, donde más se necesita. Se reflexiona sobre la importancia que tiene evaluar los riesgos antes de introducirse en el mercado organismos genéticamente modificados y la necesidad de regulación en los países. PMID:21927675

Yunta, Eduardo Rodríguez

2011-01-01

72

Aleaciones con memoria de forma, una filosofía diferente en la ingeniería y el diseño con materias  

Microsoft Academic Search

Los materiales con memoria de forma también llamados materiales inteligentes poseen propiedades que los diferencian del resto de materiales. Estas propiedades no son propiedades mejoradas respecto a los materiales convencionales, sino que son nuevas propiedades que hacen que el proceso de diseño con materiales haya de ser modificado. La comprensión de estas nuevas propiedades y la estandarización de todos los

Fco. Javier Peña Andrés

2002-01-01

73

Est. Date Operation Product Rate Comments N P2O5 K2O Ca S 10/14 Paratill  

E-print Network

.3 qt 5/20 Fertilizer Air Flow 21-0-0 150 watered in 31 6/5 Post Herbicide Program if needed varies Air Flow 46-0-0 350 split 100lb, 250lb, watered in. 161 10/10 Harvest Researcher responsible gpa 4/1 Broadcast with Airflow 0-0-60 Potash 350 lb Rate depends on soil test 210 4/1 Broadcast

74

Transport properties of PbO-P2O5-ZnO-Li2O glass system  

NASA Astrophysics Data System (ADS)

The electrical conductivity of Li+ ion conducting lead zinc phosphate glasses have been carried out both as a function of temperature and frequency in the temperature range 458-510K and over frequencies 40 Hz to 10 MHz. The dc conductivities show Arrhenius behavior and show compositional dependence. The ? decreases with increase in Li2O content. The ac conductivity behavior has been analyzed using Almond-West power law using a single exponent. The exponent 's' obtained from the power law fits is found to have values ranging from 0.74 - 0.80 in these glasses and shows moderate temperature dependence, which is attributed to high degree of modification in the glass network.

Lakshmikantha, R.; Rajaramakrishna, R.; Ayachit, N. H.; Anavekar, R. V.

2012-06-01

75

DESAFÍOS ÉTICOS DE LA INVESTIGACIÓN CON ANIMALES, MANIPULACIÓN GENÉTICA  

PubMed Central

En la investigación con animales existen cuestionamientos éticos tanto en el uso como modelos de enfermedades humanas y requisito previo para ensayos en humanos como en la introducción de modificaciones genéticas. Algunos de estos cuestionamientos son: no representar exactamente la condición humana como modelos, realizar pruebas de toxicidad con grave daño para los animales, alterar su naturaleza mediante modificaciones genéticas, riesgos de la introducción de organismos genéticamente modificados. El uso de animales en investigación para beneficio humano, impone al ser humano la responsabilidad moral de respetarlo, no haciéndoles sufrir innecesariamente, al estar trabajando con seres vivientes y sentientes. PMID:23338641

Yunta, Eduardo Rodríguez

2012-01-01

76

Photoacoustic studies of xCr2O3(1 - x)[2 P2O5· Na2O] glasses  

NASA Astrophysics Data System (ADS)

Photoacoustic and UV-VIS spectroscopy, magnetic susceptibility and electron paramagnetic resonance measurements have been performed on soda-phosphate glasses in order to explain the changes in the valence states of Cr and the structure of the Cr 2O 3 incorporated in these glasses.

Barbu, A.; Bratu, I.; Ardelean, I.; Cozar, O.

1995-04-01

77

Electrorheological Effect in Suspensions of AgI/Ag2O/V2O5/ P2O5 Glass  

NASA Astrophysics Data System (ADS)

The ER effect results from bulk and surface electric polarization processes in solid grains of ER suspensions but detailed mechanisms are not very clear. The aim of the present study was to find correlations between the character of bulk charge transport processes (electronic and/or ionic) in particles of a dispersion and parameters of the ER effect. As the dispersed phase we used glasses comprising oxides of silver, vanadium and phosphorus with addition of silver iodide. Bulk electric properties of this material could be modified without changing other properties influencing the ER effect like porosity, shape of grains, hardness, affinity to a liquid matrix etc. Variations of concentration of the components result in changes of ionic and electronic conductivity whilst other properties remain constant. The suspensions of the powdered glasses showed relatively high ER effect. The dynamic yield stress figured from 35 to 160 Pa at 2.0kV/mm for 12% concentration by volume. The highest values were observed for ionically conducting samples. The values of relaxation frequencies (fg) based on bulk properties of the glass sample were calculated and correlated with the yield stress whose maximum was obtained for samples of fg close to 100 kHz. High ER effect was observed also for samples of fg in the MHz range but in this case different polarization mechanism was postulated. The influence of polarization mechanisms on rheological behavior of the prepared fluids was discussed.

Osuchowski, Marcin; P?ocharski, Janusz

78

The effect of WO3 dopant on the structural and optical properties of ZnO-P2O5 glass and the effect of gamma irradiation  

NASA Astrophysics Data System (ADS)

Zinc phosphate glasses doped with different ratios of tungsten trioxide were prepared. Optical and infrared absorption spectra were investigated before and after subjecting the glasses to 80 kGy gamma ray dose. The base undoped zinc phosphate glass shows strong and broad UV absorption band centered at about 240 nm but with no visible bands. The WO3-doped glasses reveal the same UV absorption bands beside extra three bands at 330, 380 and 575 nm which are related to the presence tungsten ions in the pentavalent state. Infrared absorption spectra show characteristic variable phosphate groups with limited variations when introducing WO3 in the doping level up to 0.75%. Electron spin resonance measurements of the selected high doped tungsten glass indicate that mixed penta- and hexa-valent states of the tungsten ions and on gamma irradiation the pentavalent increases. The result supports the optical absorption after gamma irradiation which involves photochemical reactions in the UV region and the transformation of some W6+ to W5+ by absorbing electrons during the irradiation process.

Abdelghany, A. M.; Hammad, Ahmed H.

2015-02-01

79

Partitioning of Nb, Mo, Ba, Ce, Pb, Th and U between immiscible carbonate and silicate liquids: Evaluating the effects of P2O5,F, and carbonate composition  

NASA Technical Reports Server (NTRS)

Previously we have reported carbonate liq./silicate liq. partition coefficients (D) for a standard suite of trace elements (Nb, Mo, Ba, Ce, Pb, Th, and U) and Ra and Pa as well. In brief, we have found that immiscible liquid partitioning is a strong function of temperature. As the critical temperature of the carbonate-silicate solvus is approached, all partition coefficients approach unity. Additionally, for the overwhelming majority of the partitioning elements, InD is a linear function of 'ionic field strength,' z/r, where z is the charge of the partitioned cation and r is its ionic radius.

Jones, J. H.; Walker, D.

1993-01-01

80

Phase equilibria in the P(2)O(5)-CaO-CaF(2)-NaF-H(2)O quinary system and the formation of apatite  

NASA Astrophysics Data System (ADS)

Phase equilibria among calcium phosphates in the Hsb3POsb4-Ca(OH)sb2-Hsb2O ternary system were determined as a basis for research in the formation of hydroxyapatite, a biomaterial. The acidic portion of the ternary diagram was established. Ca(Hsb2POsb4)sb2 was not stable for temperatures below 100sp°C. The experimental and theoretical dissolution paths of Ca(Hsb2POsb4)sb2{*}Hsb2O were compared. It is possible for the initial dissolution of Ca(Hsb2POsb4)sb2{*}Hsb2O to supersaturate the system with respect to hydroxyapatite because Ca(Hsb2POsb4)sb2{*}Hsb2O is "twice" incongruently soluble. Hydroxyapatite composition is variable with a Ca/P ratio ranging from 1.5 to 1.67. Hydroxyapatite formation from acid-base reactions of CaHPOsb4 and Casb4(POsb4)sb2O was investigated for composition at the terminal limits. The total heats-of-reaction (Delta Hsb{r}) were determined to be 261.3 and 320 kJ/mol for the formation of calcium deficient and stoichiometric hydroxyapatite, respectively. Activation energies of 84.7 and 87.4 kJ/mol were calculated for the formation of calcium deficient and stoichiometric hydroxyapatite, respectively. Heats-of-formation (Delta Hsb{f}) for Casb4(POsb4)sb2O and Casb9HPOsb4(POsb4)sb5OH were calculated to be -4764.1 and -1207.7 kJ/mol, respectively. The effects of magnesium on hydroxyapatite formation in vitro from CaHPOsb4 and Casb4(POsb4)sb2O at 37.4sp°C were investigated. Magnesium is a biological agent with 0.78 mM concentrations in blood. Magnesium inhibited nucleation for 1 mM concentrations and above for a 5 liquid-to-solids ratio. However, a 5 mM concentration of MgClsb2 slightly accelerated the growth rate. The activity of magnesium is approximately 6% of its concentration. Therefore the inorganic chemical activity of magnesium may not significantly inhibit the formation of bioapatites. Phase equilibria in the Psb2Osb5-CaO-CaFsb2-Hsb2O system at 37.4sp°C was determined and dental fluorosis explained. Fluoroapatite dissolves incongruently with respect to CaFsb2. Therefore, treatment of dentin and tooth enamel with fluoride leads to the formation of fluorosis because the solution first becomes supersaturated with CaFsb2. Based on thermodynamics, the conversion of hydroxyapatite to fluoroapatite cannot be a single exchange of fluoride for hydroxl. CaHPOsb4 hydrolysis and equilibrium in sodium fluoride solutions at 37.4sp°C reveal the added effect of sodium on the system. Sodium phosphate species form and overcome CaHPOsb4 incongruency. At initial NaF concentrations greater than 150 mM, NaF species rise and may overcome fluoroapatite incongruency.

Martin, Roger Isaac

81

Influence of rare earth addition on the thermal and structural stability of CaOsbnd Fe2O3sbnd P2O5 glasses  

NASA Astrophysics Data System (ADS)

The thermal and structural stability of calcium iron phosphate glasses doped with rare earth oxides has been studied by investigating differential scanning calorimetry, the concentration of modified ions in leachate, Fourier transform infrared spectra, and Raman spectra. The results showed that thermal stability of the rare earth phosphate glasses increased and the release rate of rare earth ions in leachate decreased with the increase of cationic field strength. It related to the known structural units and characteristic bands of these glasses detected by infrared and Raman spectra. Metaphosphate chains by the cross-links of calcium ions and Psbnd Osbnd P linkages were easier to hydrolyze, which converted to orthophosphate units after corrosion. The formation of more chemically resistant REsbnd Osbnd P bonds with the addition of rare earth leaded to an increased quantity of nonbridging oxygen, which caused consequent variations in the chemical durability of rare earth glasses.

Li, Haijian; Liang, Xiaofeng; Wang, Cuiling; Yu, Huijun; Li, Zhen; Yang, Shiyuan

2014-11-01

82

In vivo behavior of bioactive phosphate glass-ceramics from the system P2O5-Na2O-CaO containing TiO2.  

PubMed

Soda lime phosphate bioglass-ceramics with incorporation of small additions of TiO2 were prepared in the metaphosphate and pyrophosphate region, using an appropriate two-step heat treatment of controlled crystallization defined by differential thermal analysis results. Identification and quantification of crystalline phases precipitated from the soda lime phosphate glasses were performed using X-ray diffraction analysis. Calcium pyrophosphate (beta-Ca2P2O7), sodium metaphosphate (NaPO3), calcium metaphosphate (beta-Ca(PO3)2), sodium pyrophosphate (Na4P2O7), sodium calcium phosphate (Na4Ca(PO3)6) and sodium titanium phosphate (Na5Ti(PO4)3) phases were detected in the prepared glass-ceramics. The degradation of the prepared glass-ceramics were carried out for different periods of time in simulated body fluid at 37 degrees C using granules in the range of (0.300-0.600 mm). The released ions were estimated by atomic absorption spectroscopy and the surface textures were measured by scanning electron microscopy. Evaluation of in vivo bioactivity of the prepared glass-ceramics was carried through implanting the samples in the rabbit femurs. The results showed that the addition of 0.5 TiO2 mol% enhanced the bioactivity while further increase of the TiO2 content decreased the bioactivity. The effect of titanium dioxide on the bioactivity was interpreted on the basis of its action on the crystallization process of the glass-ceramics. PMID:17701314

Monem, Ahmed Soltan; ElBatal, Hatem A; Khalil, Elsayed M A; Azooz, Moenis A; Hamdy, Yousry M

2008-03-01

83

Conductivity stabilization by metal and oxide additives in ceramics on the basis of VO 2 and glass V 2O 5–P 2O 5  

Microsoft Academic Search

Conductivity behavior during the temperature cycling through the phase transition temperature of VO2 (Tt=68°C) was investigated in glass-ceramics based on VO2 and vanadium phosphate glass (VPG) for compositions without and with Cu and SnO2 additives. Copper and SnO2 additives stabilize the conductivity of glass-ceramics at temperature cycling. For ceramics (wt%) (80?y)VO2–5Cu–15VPG–ySnO2 the best stabilizing effect takes place when SnO2 content

A. I. Ivon; V. R. Kolbunov; I. M. Chernenko

2005-01-01

84

Theoretical Analysis of the Triplet Excited State of the [Pt2(H2P2O5)4]4-Ion and Comparison with Time-Resolved X-ray  

E-print Network

Coppens* Contribution from the Department of Chemistry, State UniVersity of New York at Buffalo, Buffalo, New York 14260-3000 Received July 25, 2002 ; E-mail: coppens@acsu.buffalo.edu Abstract: A full a lifetime of 9-10 µs in water and acetonitrile solutions, and a high quantum yield (r ) 0

Coppens, Philip

85

Diopside (CaO-MgO-2SiO2)-fluorapatite (9CaO-3P2O5-CaF2) glass-ceramics: Potential materials for bone tissue engineering  

SciTech Connect

Glass-ceramics in the diopside (CaMgSi2O6) - fluorapatite [Ca5(PO4)3F] system are potential candidates for restorative dental and bone implant materials. In the present study, a series of glasses along diopside - fluorapatite binary system have been prepared with varying diopside/fluorapatite ratios for their potential applications in bone tissue engineering. The glasses were obtained from compositions with fluorapatite contents varying between 0-40 wt.%. The sintering ability and crystallization kinetics of as obtained amorphous glasses have been studied through hot-stage microscopy (HSM) and differential thermal analysis (DTA), respectively while crystalline phase evolution in sintered GCs has been followed by X-ray diffraction (XRD) adjoined with Rietveld-R.I.R. technique and scanning electron microscopy (SEM). Further, biodegradation and apatite forming ability of glass-ceramics were investigated by immersion of glass-ceramic discs in simulated body fluid (SBF) solution while chemical degradation and weight loss of glass-ceramics were studied by immersion in Tris-HCl in accordance with standard ISO 10993-14. The addition of fluorapatite (10-25 wt.%) in diopside glass system significantly enhanced the sintering ability of glass-ceramics and improved their apatite forming ability along with their biodegradation behaviour. Moreover, the in vitro cellular responses to glass-ceramics showed good cell viability and significant stimulation of osteoblastic differentiation, suggesting the possible use of the glass-ceramics for bone regeneration.

Kansal, Ishu; Goel, Ashutosh; Tulyaganov, Dilshat U.; Pascual, Maria J.; Lee, Hye-Young; Kim, Hae-Won; Ferreira, Jose M.

2011-08-18

86

Optical character of Er 3+/Yb 3+ co-doped P 2O 5-CaO-Na 2O-Al 2O 3-AgO phosphate glass  

NASA Astrophysics Data System (ADS)

The up-conversion (UC) and near infrared (NIR) luminescence of Er3+/Yb3+ co-doped phosphate glass are investigated. In the UC emission range, the 523 nm, 546 nm green emissions and the 659 nm red emission are observed. With the increasing pump power, the intensity ratios of I523/I659, I546/I659 and I523/I546 increase gradually. The phenomenon is reasonably interpreted by theoretical analysis based on steady state rate equations. The emission cross section of the infrared emission at 1546 nm is larger (about 6.7 × 10- 21 cm2), which is suitable for making fiber amplifier.

Ming, Chengguo; Song, Feng; Yu, Yin; Zhang, Gong; Wang, Qingru; Yu, Hua; Sun, Tongqing; Tian, Jianguo

2011-04-01

87

The recycling of incinerated sewage sludge ash as a raw material for CaO-Al2O3-SiO2-P2O5 glass-ceramic production.  

PubMed

In this paper, the recycling of incinerated sewage sludge ash (ISSA) into glass-ceramic materials by a two-stage sintering cycle of nucleation stage and crystallization stage without any pressure and binder is presented. The parent glasses were subjected to the following nucleation/crystallization temperature and time level: (A) 790°C, 1.0?h/870°C, 1.0-3.0?h; (B) 790°C, 1.0?h/945°C, 1.0-3.0?h and (C) 790°C, 1.0?h/1065°C, 1.0-3.0?h. X-ray power diffraction analysis results revealed that multiple crystalline phases coexisted in the glass-ceramic materials and the crystalline phase compositions were more affected by crystallization temperature than crystallization time. Scanning electron microscopy analysis showed an interlocking microstructure of glass phases and crystals with different sizes and spatial distribution. The glass-ceramics crystallized at 945°C for 2.0?h exhibited optimal properties of density of 2.88?±?0.08?g/cm(3), compression strength of 247?±?12?MPa, bending strength of 118?±?14?MPa and water absorption of 0.42?±?0.04. The leaching concentrations of heavy metals were far lower than the limits required by the regulatory standard of EPA. This paper provides a feasible, low-cost and promising method to produce ISSA-based glass-ceramics and highlights the principal characteristics that must be taken into account to use ISSA correctly in glass-ceramics. PMID:25358410

Zhang, Zhikun; Zhang, Lei; Yin, Yulei; Liang, Xuanye; Li, Aimin

2015-05-01

88

Entrevista con Ricardo Halac  

E-print Network

capitalismo, que cada vez es más abstracto, financiero, ingobernable. Pero el racionalismo subsiste en su vieja forma en el pensamiento de izquierda: en la Unión Soviética, en China, en las democracias populares, se está "construyendo11 el hombre nuevo. En... 1968, con la muerte del "Che" Guevara en Bolivia, luego de una campaña "racionalmente" perfecta, los bolivianos se tenían que insubordinar y seguirlo. Entra en crisis entonces el pensamiento racional en el mundo entero. Hasta las grandes religiones...

Glickman, Nora

1990-04-01

89

¡Truco Con Agua!  

NSDL National Science Digital Library

En esta actividad los aprendices aprenderán un truco de magia donde la magia es la presión del aire. Los participantes tomarán un vaso de agua medio lleno y lo taparán con un pedazo de plástico o cartón. Sosteniendo la tarjeta contra el vaso, lo voltearán boca abajo y cuando quiten la mano debajo del vaso, ¡abracadabra! no se caerá el agua. En la tira cómica, Mateo explica a los aprendices que la presión que hace el aire en todas las direcciones es la que sostiene la tarjeta.

Lawrence Hall of Science

2009-01-01

90

Entrevista con Enrique Buenaventura  

E-print Network

dramaturgia práctica grupai y su extensa labor docente, han ido resultando en un considerable y ponderado corpus teórico sobre la íntima relación del discurso teatral y la historia, especialmente esa historia truncada, manipu lada y camuflada por poderosos... mucho más. Esta manera suya de actuar hizo que todo el mundo se metiera en la guerra y de una manera muy decidida. Entonces se empezó a producir la desmoralización de la Guardia. Como si hubieran ido demasiado lejos con la represión y la matanza. Sí...

Dí ez, Luys A.

1981-04-01

91

Galaxias australes con núcleo doble  

NASA Astrophysics Data System (ADS)

Se estudia una muestra de galaxias australes con núcleo doble a partir de una búsqueda extensiva en la literatura. Se analizan las características morfológicas, fotométricas y espectroscópicas de la muestra. Para algunas galaxias se han realizado observaciones con el espectrógrafo multifunción (EMF) de la Estación Astrofísica de Bosque Alegre a partir de las cuales se determinaron parámetros cinemáticos.

Gimeno, G.; Díaz, R.; Carranza, G.

92

Planificación Neuroquirúrgica con Software Osirix  

PubMed Central

Introducción: La individualidad anatómica es clave para reducir el trauma quirúrgico y obtener un mejor resultado. Actualmente, el avance en las neuroimágenes ha permitido objetivar esa individualidad anatómica, permitiendo planificar la intervención quirúrgica. Con este objetivo, presentamos nuestra experiencia con el software Osirix. Descripción de la técnica: Se presentan 3 casos ejemplificadores de 40 realizados. Caso 1: Paciente con meningioma de la convexidad parasagital izquierda en área premotora; Caso 2: Paciente con macroadenoma hipofisario, operada previamente por vía transeptoesfenoidal en otra institución con una resección parcial; Caso 3: Paciente con lesiones en pedúnculo cerebeloso medio bilateral. Se realizó la planificación prequirúrgica con el software OsiriX, fusionando y reconstruyendo en 3D las imágenes de TC e IRM, para analizar relaciones anatómicas, medir distancias, coordenadas y trayectorias, entre otras funciones. Discusión: El software OsiriX de acceso libre y gratuito permite al cirujano, mediante la fusión y reconstrucción en 3D de imágenes, analizar la anatomía individual del paciente y planificar de forma rápida, simple, segura y económica cirugías de alta complejidad. En el Caso 1 se pudo analizar las relaciones del tumor con las estructuras adyacentes para minimizar el abordaje. En el Caso 2 permitió comprender la anatomía post-operatoria previa del paciente, para determinar la trayectoria del abordaje transnasal endoscópico y la necesidad de ampliar su exposición, logrando la resección tumoral completa. En el Caso 3 permitió obtener las coordenadas estereotáxicas y trayectoria de una lesión sin representación tomográfica. Conclusión: En casos de no contar con costosos sistemas de neuronavegación o estereotáxia el software OsiriX es una alternativa a la hora de planificar la cirugía, con el objetivo de disminuir el trauma y la morbilidad operatoria. PMID:25165617

Jaimovich, Sebastián Gastón; Guevara, Martin; Pampin, Sergio; Jaimovich, Roberto; Gardella, Javier Luis

2014-01-01

93

Jugando con geometría: Crear secuencias con formas y palabras  

NSDL National Science Digital Library

En esta actividad, los chicos crean secuencias con palabras y formas. Los chicos usan colecciones de triángulos, cuadrados, y rectángulos con palabras adentro. Los chicos organizan las forman en secuencias geométricas que se repiten o que cambian de manera sistemática en cada línea. Los chicos más jóvenes pueden crear secuencias simples; los mayores pueden explorar secuencias que crecen de diferentes maneras. Esta actividad tiene colecciones de palabras en tres niveles de dificultad diferente. Disponible en formato Web y PDF. También disponible en Inglés.

TERC

2012-06-26

94

Compatibilidad con audfonos para sordos  

E-print Network

Compatibilidad con audífonos para sordos Hearing Aid Compatibility Q&A Q. What does hearing aid the different features of the phone thoroughly and in different locations, using your hearing aid or cochlear implant, to determine if you hear any interfering noise. Consult a sales representative about phone return

Greenberg, Albert

95

todasuvida: Las personas con diabetes son ms  

E-print Network

diabetes Controlesu todasuvida: Las personas con diabetes son más propensas a padecer de enfermedades del corazón que quienes no tienen diabetes. Boletín 631 D Las personas con diabetes tienen mayor- res relacionados con la diabetes, como derrame cerebral, mala circulación en las piernas y pies e

96

Generación de Electricidad con Energías Renovables (ER)  

Microsoft Academic Search

Los funcionarios argumentaron, entre otros, sobre la sostenibilidad energética a largo plazo, la producción de electricidad con Energías Renovables-ER (biomasa, eólico, solar, geotérmico, mareomotriz, e hidráulica con capacidad menor de 20 MW), la contaminación ambiental y las externalidades que produce, y las iniciativas sobre el uso de ER que han adoptado países mas adelantados como Alemania y España. El Vice-Ministro

Jaime E. Luyo

2008-01-01

97

ORNL/CON-462 Methodology for  

E-print Network

ORNL/CON-462 Methodology for the Evaluation of a 4000-Home Geothermal Heat Pump Retrofit at Fort agency thereof. #12;ORNL/CON-462 Methodology for the Evaluation of a 4000-Home Geothermal Heat Pump of the Fort Polk bid documents and the resultant performance contract between the Army and Co-Energy Group

Oak Ridge National Laboratory

98

AwareCon: Situation Aware Context Communication  

Microsoft Academic Search

Ubicomp environments impose tough constraints on networks, including immediate communication, low energy consumption, minimal maintenance and ad- ministration. With the AwareCon network, we address these challenges by prescribing an integrated architecture that differs from classical networking by featuring an aware- ness of the surrounding situation and context. In various settings, where AwareCon was implemented on tiny battery driven devices, we

Michael Beigl; Albert Krohn; Tobias Zimmer; Christian Decker; Philip Robinson

2003-01-01

99

DIVERSAS MANERAS DE GENERAR ENERGIA CON  

E-print Network

DE OLAS #12;PAISES CON MAYOR CAPACIDAD HIDROELECTRICA Country Annual Hydroelectric Energy Production hydroelectric generating system. Three Gorges Dam Gezhouba Dam #12;COSTO PROMEDIO DE PRODUCCION (KWH) #12;U

Gilbes, Fernando

100

Trastorno por déficit de atención con hiperactividad: comorbilidad con trastornos depresivos y de ansiedad  

Microsoft Academic Search

El estudio analiza el perfil comórbido del Trastorno por Déficit de Atención con Hiperactividad (TDAH) y trastornos depresivos y\\/o de ansiedad (TI), explorando el modelo que predice esta asocia- ción psicopatológica. Se analiza una muestra de 90 casos con TDAH (6-16 años) y mediante investi- gación diferencial se compara la agrupación TDAH+TI con la ausencia de esta comorbilidad. El caso

José Antonio López-Villalobos; Isabel Serrano Pintado; Juan Delgado Sánchez-Mateos

2004-01-01

101

Ependimoma myxopapilar sacro gigante con osteolisis  

PubMed Central

Objetivo: la presentación de un caso de una paciente con un ependimoma sacro con extensa infiltración y destrucción ósea local. Descripción del caso: una mujer de 53 años acudió a la consulta por dolor lumbosacro y alteraciones sensitivas perineales y esfinterianas. La imágenes por Resonancia Magnética (IRM) y la Tomografía Axial Computada (TAC) mostraron una lesión expansiva gigante a nivel S2-S4 con extensa osteólisis e invasión de tejidos adyacentes. Se realizó una exéresis tumoral completa con mejoría del estatus funcional. La anatomía patológica informó ependimoma mixopapilar. Discusión: la extensión de la resección quirúrgica es el mejor predictor de buen pronóstico. El tratamiento radiante se reserva como opción adyuvante para las resecciones incompletas y recidiva tumoral. La quimioterapia sólo debería utilizarse en casos en que la cirugía y la radioterapia estén contraindicadas. Conclusión: Los ependimomas mixopapilares sacros con destrucción ósea y presentación intra y extradural son muy infrecuentes y deben ser tenidos en cuenta entre los diagnósticos diferenciales preoperatorios. Su resección total, siempre que sea posible, es la mejor alternativa terapéutica. PMID:25165615

Ajler, Pablo; Landriel, Federico; Goldschmidt, Ezequiel; Campero, Álvaro; Yampolsky, Claudio

2014-01-01

102

Opciones de cirugía para mujeres con CDIS o con cáncer de seno  

Cancer.gov

Contiene información sobre los tipos de cirugía de seno, como la operación para conservar el seno y la mastectomía, y ayuda a las mujeres diagnosticadas con CDIS o con cáncer de seno a decidir cuál cirugía es la más conveniente para ellas.

103

The iCons Four Year Curriculum Plan Contact: iCons@cns.umass.edu  

E-print Network

program offered by the College of Natural Sciences at the University their evolution in the iCons Program. Students' reflections in their portfolios) YEAR 1 (Spring 2013) iCons-1 (4 CR) 1 section: Tues/Thurs "Global Challenges

Auerbach, Scott M.

104

DIVERSAS MANERAS DE GENERAR ENERGIA CON  

E-print Network

;PAISES CON MAYOR CAPACIDAD HIDROELECTRICA Country Annual Hydroelectric Energy Production (TW-Rivera #12;The Three Gorges Dam project in Hubei, China, is the world's largest hydroelectric generating convirtio en la fuente principal de energia en Puerto Rico #12;23/feb/2008 Wave Power Energía de las Olas

Gilbes, Fernando

105

Equivariant con guration spaces Colin Rourke  

E-print Network

by thinking of the con guration as a set of charged particles and using the electric eld they generate (see 8(X) is a nite disjoint collection of little discs in M which is closed under the action of G and such that each

Rourke, Colin

106

Google Scholar: the pros and the cons  

Microsoft Academic Search

Purpose – To identify the pros and the cons of Google Scholar. Design\\/methodology\\/approach – Chronicles the recent history of the Google Scholar search engine from its inception in November 2004 and critiques it with regard to its merits and demerits. Findings – Feels that there are massive content omissions presently but that, with future changes in its structure, Google Scholar

Péter Jacsó

2005-01-01

107

Interacción, Motivación y Emociones con Videojuegos  

Microsoft Academic Search

El principal objetivo de este trabajo es comprender como se construye el conocimiento y se adquieren competencias en una comunidad virtual de aprendizaje soportada en una plataforma telemática integrada con un juego 3D de rol masivo. Para ello, hemos diseñado actividades formativas colaborativas que nos permitirán modelar las interacciones de una comunidad de aprendizaje virtual producidas en juegos de rol

Carina S. González; Francisco Blanco

108

The Pros and Cons of Artificial Reefs  

NSDL National Science Digital Library

This lesson plan asks students to consider whether artificial reefs (human-made objects in the ocean or sea) are good for marine ecosystems. Students will look at pictures of artificial reefs and read articles describing the pros and cons of these structures. They will conclude by writing paragraphs explaining whether they think a new artificial reef should be created in Florida waters.

109

Interacción con Entornos Virtuales en teléfonos móviles  

Microsoft Academic Search

En este trabajo presentamos un sistema para la navegación en entornos virtuales 3D sobre teléfonos móviles. Tradicionalmente la interacción con el teléfono móvil se ha realizado utilizando el teclado como dispositivo de interacción. Sin embargo, gracias a las capacidades de los nuevos terminales es posible aprovechar dispositivos como la cámara incorporada o los acelerómetros para implementar interacciones basadas en movimientos

Jesús Gimeno; Marcos Fernández; Pedro Morillo; Lucía Vera

110

The pros and cons of hospital employment.  

PubMed

The pros and cons of hospital employment vary significantly in today's economic environment. This chapter summarizes the advantages and disadvantages of hospital employment with an emphasis on the critical aspect of formalizing an agreement with the hospital employer to prevent future salary reductions and/or termination. PMID:23924751

Bert, Jack M

2013-09-01

111

Descubre la biblioteca con Gua rpida  

E-print Network

provenientes de los recursos electrónicos y del repositorio institucional #12;Acceso desde la página web de la, revistas, audiovisuales, mapas, ... Repositorio UAM: tesis doctorales, proyectos de investigación, revistas Repositorio · Algunas suscripciones a recursos electrónicos #12;Enlace con el documento Acceso mediante el

Autonoma de Madrid, Universidad

112

VANET Routing Protocols: Pros and Cons  

E-print Network

VANET (Vehicular Ad-hoc Network) is a new technology which has taken enormous attention in the recent years. Due to rapid topology changing and frequent disconnection makes it difficult to design an efficient routing protocol for routing data among vehicles, called V2V or vehicle to vehicle communication and vehicle to road side infrastructure, called V2I. The existing routing protocols for VANET are not efficient to meet every traffic scenarios. Thus design of an efficient routing protocol has taken significant attention. So, it is very necessary to identify the pros and cons of routing protocols which can be used for further improvement or development of any new routing protocol. This paper presents the pros and cons of VANET routing protocols for inter vehicle communication.

Paul, Bijan; Bikas, Md Abu Naser

2012-01-01

113

Aspectos relacionados con la sexualidad y la reproducción (PDQ®)  

Cancer.gov

Resumen de información revisada por expertos acerca de los factores que podrían afectar el funcionamiento sexual de las personas con cáncer. Se discuten además temás sobre la fertilidad relacionados con el tratamiento del cáncer.

114

Aspectos relacionados con la sexualidad y la reproducción (PDQ®)  

Cancer.gov

Resumen de información revisada por expertos acerca de los factores que pueden afectar el funcionamiento sexual de las personas con cáncer. Se discuten además temas sobre la fecundidad relacionados con el tratamiento del cáncer.

115

Experimental and Computational Studies of Carbonyl Diazide (CON6) as a Precursor to Diazirinone (CON2)  

NASA Astrophysics Data System (ADS)

Intrigued by the reported 2005 synthesis of diazirinone (1), we carried out further experimental and theoretical studies aimed at the detailed matrix-isolation and millimeter-wave spectroscopic characterizations of 1. Diazirinone (1) is a peculiar isoconjugate of two very stable molecules and may be of astrochemical interest. Unfortunately, the original reported methods of diazirinone (1) generation did not yield this species, rather its decomposition products. Inspired by a more recent gas phase pyrolysis of CON6 (2) to yield CON2 (1), we proposed a new method of generating CON6 (2) in solution as a precursor of diazirinone (1). This new synthesis may allow us to generate larger quantities of both CON6 and CON2 for investigation by millimeter-wave spectroscopy. We are able to safely generate carbonyl diazide (2) in sufficient yield from the reaction of triphosgene (3) and tetrabutylammonium azide in diethyl ether. This has allowed us to obtain both matrix-isolation and gas phase IR spectra of carbonyl diazide (2). After purification, it has a gas-phase lifetime that allows samples to be useable for up to several weeks. However, it is a shock-sensitive material that must be handled with care to prevent violent decomposition. In order to provide better mechanistic insight into the decomposition of carbonyl diazide (2) to diazirinone (1), we have engaged in a DFT and ab initio computational study. We have found a pathway between the two species via the triplet acylnitrene, CON4, and an oxaziridine CON2 species, but not at sufficiently low energies to allow for the trapping and detection of diazirinone (1). Preliminary millimeter-wave spectra have been obtained from several synthesized and purified samples of CON6 (2). However, the assignment of the spectra lines has been unexpectedly problematic. We have placed several CON6 (2) samples, confirmed by IR spectroscopy at the time of sample loading, into our instrument and obtained two different sets of rotational lines. This rotational puzzle will be investigated further with a significantly upgraded millimeter-wave spectrometer.

Esselman, Brian J.; Amberger, Brent K.; Nolan, Alex M.; Woods, R. Claude; McMahon, R. J.

2011-10-01

116

Tiene familiares con Alzheimer? La Escuela de Medicina del Recinto de Ciencias Mdicas en colaboracin con la Universidad de Columbia  

E-print Network

¿Tiene familiares con Alzheimer? 25/1/2008 La Escuela de Medicina del Recinto de Ciencias Médicas más con Alzheimer para participar de un estudio genético. La investigación pretende encontrar genes que se encuentren relacionados a la enfermedad de Alzheimer con el propósito de aprender más sobre las

Quirk, Gregory J.

117

Energy Star program benefits Con Edison  

SciTech Connect

Impressed with savings in energy costs achieved after upgrading the lighting and air conditioning systems at its Manhattan headquarters, Home Box Office (HBO) wanted to do more, James Flock, vice president for computer and office systems, contacted Con Edison Co. of New York in March 1991 to determine what the company could do to save money by reducing energy consumed by personal computers. Arthur Kressner, Con Edison Research and Development manager contacted industry organizations and manufacturers for advice, but was told only to shut off computers at night and on weekends. Kressner arranged a series of meetings with IBM and the Electric Power Research Institute (EPRI) to discuss the issue, then approached the U.S. Environmental Protection Agency (EPA), which was designing a program to promote the introduction and use of energy-efficient office equipment. In 1992, the EPA announced the Energy Star program for PCs, enabling manufacturers to display the Energy Star logo on machines meeting program criteria, including the ability to enter a sleep mode in which neither the computer nor monitor consume more than 30 W or electricity. Industry experts estimate national energy consumption by office equipment could double by the year 2000, but Energy Star equipment is expected to improve efficiency and help maintain electric loads.

NONE

1995-05-01

118

Web Spoofing: An Internet Con Game  

NSDL National Science Digital Library

The Safe Internet Programming group at the Princeton University Department of Computer Science in 1996 published a paper on the practice known as "web spoofing," through which an attacker intervenes between an end-user browsing the Web and real Web sites. The attacker sets up a shadow copy of the Web, and as users request pages from sites they will receive pages from the attacker's site instead. This process also enables attackers to gather data (possibly credit card numbers, etc.) submitted through bogus web forms. The nine-page paper describes how the con game works and suggests remedies. The article is available in PostScript, compressed PostScript, Microsoft Word, and zipped Microsoft Word format. Unfortunately, it is not available online as HTML.

Balfanz, Dirk .

1996-01-01

119

Habilidades matemáticas y funcionamiento ejecutivo de niños con trastorno por déficit de atención con hiperactividad y dificultades del aprendizaje de las matemáticas  

Microsoft Academic Search

A pesar de que un 26% de niños con TDAH tiene una dificultad específica en el aprendizaje de las ma- temáticas (DAM) las investigaciones han sido escasas. El presente estudio se planteó estudiar: 1) el perfil de los niños con TDAH+DAM en habilidades cognitivas y metacognitivas de cálculo y solución de problemas, en comparación con niños con TDAH, niños con

Ana Miranda Casas; Amanda Meliá de Alba; Rafaela Marco Taverner

2009-01-01

120

if l = nil then m := cons(a, nil);  

E-print Network

if l = nil then m := nil; else begin a := l.1; m := cons(a, nil); i := l.2; j := m; while i = nil do begin a := i.1; t := cons(a,nil); j.2 := t; i := i.2; j := t; end end 1 #12;{l nil} if l = nil then m := nil; else begin a := l.1; m := cons(a, nil); i := l.2; j := m; while i = nil do begin a := i.1

Reddy, Uday S.

121

Clave de determinacin de los Heliconiinae con rayas anaranjadas  

E-print Network

: mathieu.joron@ed.ac.uk 1. a. Abdomen con puntos amarillos y gruesos en los costados (intrasegmentales..............................................................................2 2. a. Abdomen con anillos intersegmentales amarillos........................Heliconius xanthocles relativamente pequeña, abdomen no muy largo. Ciertas razas no tienen color anaranjado en la cara dorsal

Joron, Mathieu

122

Breath Analysis Science at PittCon 2012, Orlando, Florida  

EPA Science Inventory

Breath analysis science was featured in three organized sessions at this year?s Pittsburgh Conference and Exposition, or ?PittCon 2012? (http://www.pittcon.org/). As described in previous meeting reports, PittCon is one of the largest international conferences for analytical chem...

123

RoboCon: A general purpose telerobotic control center  

SciTech Connect

This report describes human factors issues involved in the design of RoboCon, a multi-purpose control center for use in US Department of Energy remote handling applications. RoboCon is intended to be a flexible, modular control center capable of supporting a wide variety of robotic devices.

Draper, J.V.; Noakes, M.W. [Oak Ridge National Lab., TN (United States). Robotics and Process Systems Div.; Schempf, H. [Carnegie Mellon Univ., Pittsburgh, PA (United States); Blair, L.M. [Human Machine Interfaces, Inc., Knoxville, TN (United States)

1997-02-01

124

Introduzione alla programmazione client-side (con Javascript)  

E-print Network

1 MODULO 2 PARTE 4 Introduzione alla programmazione client-side (con Javascript) Goy - a.a. 2010/2011 Programmazione Web client side (con Javascript) 1 · Javascript è un linguaggio di scripting, tipicamente Javascript · Come tutti i linguaggi di scripting, è interpretato: il sorgente non deve essere compilato per

Goy, Anna

125

Introduzione alla programmazione client-side (con Javascript)  

E-print Network

1 MODULO 2 PARTE 4 Introduzione alla programmazione client-side (con Javascript) Goy - a.a. 2009/2010 Programmazione Web client side (con Javascript) 1 · Javascript è un linguaggio di scripting, tipicamente Javascript · Come tutti i linguaggi di scripting, è interpretato: il sorgente non deve essere compilato per

Goy, Anna

126

Introduzione alla programmazione client-side (con Javascript)  

E-print Network

1 MODULO 2 PARTE 4 Introduzione alla programmazione client-side (con Javascript) Goy - a.a. 2012/2013 Programmazione Web client side (con Javascript) 1 Il fil rouge del MODULO 2 PARTE 4: Introduzione alla progr. client-side · Javascript · DOM e gestori di eventigli oggetti del DOM... PARTE 5: Programmare sul Web 2

Goy, Anna

127

Introduzione alla programmazione client-side (con Javascript)  

E-print Network

1 MODULO 2 PARTE 4 Introduzione alla programmazione client-side (con Javascript) Goy - a.a. 2011/2012 Programmazione Web client side (con Javascript) 1 Il fil rouge del MODULO 2 PARTE 4: Introduzione alla progr. client-side · Javascript · DOM e gestori di eventigli oggetti del DOM... PARTE 5: Programmare sul Web 2

Goy, Anna

128

The 2009 Astrobiology Graduate Student Conference (AbGradCon)  

NASA Astrophysics Data System (ADS)

The 2009 AbGradCon was held at the University of Washington in July 2009. It brought together 67 participants from 8 different countries and 34 different universities. AbGradCon also took place in the virtual world of Second Life.

Som, S. M.; Anderson, R.; Antonio, M.; Cash, M. C.; Claire, M.; Cowan, N.; Ewert, M.; Goldman, A.; Snowden, D.; Stüeken, E.

2010-04-01

129

Control del dolor: Apoyo para las personas con cáncer  

Cancer.gov

Contiene información sobre las medicinas contra el dolor para pacientes con cáncer, los planes para controlarlo, cómo hablar con su equipo de atención médica sobre el dolor que usted siente y qué hacer para controlar los efectos físicos y emocionales del mismo.

130

C31. EVALUACIÓN DE CUATRO GENOTIPOS DE MAÍZ AMARILLO (Zea mays L.) BAJO TRES NIVELES DE FERTILIZACIÓN DE NITRÓGENO Y FÓSFORO PARA LA PRODUCCIÓN DE \\  

Microsoft Academic Search

SUMMARY Ecuadorian food canning industry concerned for this provider's production, principally Baby Corn, has envisioned the necessity to find a new yellow corn genotype (Zea mays L.). Consequently, four genotypes of yellow corn were evaluated; Brasilia, SV1035, DK 5005 and INIAP 180, with three levels of nitrogen and phosphorous fertilization (0 kg\\/ha, 40 kg P2O5 con 16 kg nitrógeno y

131

Pro/con a precessional geodynamo  

NASA Astrophysics Data System (ADS)

The modest amount of research that exists on the ability, or lack of ability, of mantle precession to power a geodynamo developed mostly during the last half of the 1900s. Papers by Roberts and Stewartson (1965) and by Busse (1968) studied precession generally without a pro/con conclusion. Malkus in the late 1960s attempted to advance a positive role for precession through experiments and analysis. His experiments have survived criticism, but his analyses were discounted, especially by Rochester, Jacobs, Smylie, and Chong (1975) and by Loper (1975). Rochester, et al. critiqued existing analyses of precession, including those of Malkus, but did not reach a strong position either pro or con a precessional geodynamo. Loper argued emphatically that precession was not capable of powering the geodynamo. Explicit analyses that either critique or support Loper’s arguments have yet to appear in the literature. During the 1970s, Vanyo and associates studied energy dissipation during precession of satellite liquid fuels and its effect on satellite attitude stability. Engineers and scientists in every country that has launched satellites completed similar research. Some is published in the aerospace literature, more is available in company and government reports. Beginning in 1981, Vanyo and associates applied this knowledge to the very similar problem of energy dissipation and flow patterns in precessing mechanical models scaled geometrically and dynamically to the Earth’s liquid core. Energy experiments indicate massive amounts of mechanical energy are dissipated at the CMB, and flow experiments show complex motions within the boundary layer and axial flows with helicity throughout the interior. Analysis of Earth core precession also advanced, especially in several papers by Kerswell and by Tilgner in the late 1990s. Detail numerical models have yet to appear. Although progress in understanding the role of precession in Earth core motions has advanced, there remains a common belief, often expressed explicitly, that precession is incapable of energizing a geodynamo, a la Loper. We will present a critique of Loper’s 1975 paper and briefly discuss the common practice and belief that the geodynamo must be energized by thermal and/or compositional driven convection (motion). We note here that there is no observational evidence for existence of thermal or compositional convection within the liquid core or for growth of the solid core. Although there has been considerable success in adapting data in thermal/compositional models to yield near realistic solutions, that does not constitute a proof that those models apply to the Earth. There is absolute observational evidence for mantle precession, an Earth feature that is unique, along with the Earth’s magnetic field, among the terrestrial planets. We argue that great difficulty experienced in analysis and computation of precessional flow is a major explanation for its absence in current models of the geodynamo.

Vanyo, J.

2003-04-01

132

Cálculos ab initio con correlación electrónica  

NASA Astrophysics Data System (ADS)

Estamos entrando en una era donde la ortogonalidad entre las investigaciones de carácter experimental y de naturaleza teórica se irá difuminando progresivamente y la problemática a resolver quedará en escena como el único actor principal de la obra. Como premisa para una cooperación teórico-experimental de igual a igual, la metodología químico-cuántica utilizada debe ser capaz de ofrecer resultados de carácter predictivo. Sin duda, esta madurez en la metodología químico-cuántica ya la hemos alcanzado hace algunos años, tal y como muestra entre otras muchas, la labor que nuestro grupo ha realizado en el transcurso de la última década, dentro del campo de la Espectroscopía Teórica. Los estudios realizados comprenden una amplia gama de sistemas, variando tanto en tamaño como en complejidad, abordando problemáticas espectroscópicas consideradas tradicionalmente como especialmente controvertidas. Nuestra contribución científica más relevante reside en el carácter cuantitativo de las asignaciones espectroscópicas que hemos propuesto en base a resultados ab initio. Recordemos que en los años noventa los resultados ab initio solían presentar para las energías de excitación de sistemas de tamaño molecular moderado, como el benceno, errores de más de 1 eV. En comparación con el éxito relativo de los métodos semiempíricos, la frustración de la metodología ab initio quedaba todavía más patente. Los estudios que hemos presentado representan una comprensión profunda de los espectros electrónicos en sistemas orgánicos claves, mostrando el camino a seguir para obtener asignaciones espectroscópicas precisas (entre 0.1-0.2 eV). La naturaleza del método CASPT2 junto al diseño de estrategias computacionales nos ha permitido alcanzar el carácter cuantitativo con el que se caracterizan nuestras contribuciones[1,2]. Por todo ello, algunos de los trabajos publicados se consideran clásicos dentro del campo, pues en cierto modo definen el campo, y se reflejan en libros publicados recientemente. En la conferencia se analizarán ciertos pormenores de las investigaciones realizadas. El tipo de aplicaciones llevadas a cabo hasta la fecha se ilustrará mediante el estudio teórico del espectro electrónico de ciclooctatetraeno. Dando un paso más en la evolución de nuestra investigación, pretendemos en la actualidad describir, desde un formalismo teórico y al mismo nivel de exigencia, los mecanismos subyacentes que tienen lugar en las reacciones biológicas fototoinducidas, es decir, reacciones que se inician mediante la absorción de luz[3]. Como muestra de la caracterización de los procesos fotofísicos y fotoquímicos en fotobiología teórica, hemos elegido la descripción de la conversión interna ultrarrápida que tiene lugar en los cromóforos del ADN. Los estados excitados de las moléculas de los ácidos nucleicos presentan tiempos de vida media que se encuentran en el rango de sub-picosegundos, sugiriendo la presencia de un canal ultrarrápido de conversión interna, lo que normalmente se asocia en la fotoquímica contemporánea a una intersección cónica entre el estado excitado y el fundamental[4]. De esta forma nuestro ADN previene de forma eficaz posibles reacciones en el estado excitado y se revela como un excelente protector solar.

Merchán Bonete, M.

133

Utilidad diagnóstica del Cuestionario TDAH y del Perfil de Atención para discriminar entre niños con tratorno por déficit de atención con hiperactividad, trastornos del aprendizaje y controles  

Microsoft Academic Search

Se analiza la convergencia entre la información recogida de padres y profesores, mediante escalas de valoración, y el diagnóstico clínico en una muestra de 126 niños: 42 con Trastorno por déficit de atención con hiperactividad (TDAH) tipo combinado, 21 con Trastornos del aprendizaje (TA) y 63 controles, con edades comprendidas entre los 4 y los 12 años. El grupo de

Juan Antonio Amador; Maria Forns; Joan Guàrdia Olmos; Maribel Peró

2005-01-01

134

Control del dolor: Apoyo para las personas con cáncer  

Cancer.gov

Libro sobre el control del dolor en pacientes con cáncer. Cubre los métodos y medicinas, así como los efectos físicos y emocionales del dolor. Es una adaptación cultural para el público de habla hispana del libro en inglés Pain Control.

135

iCons, 2011 Alzheimers and Aluminum: Lesson Plan  

E-print Network

© iCons, 2011 Alzheimers and Aluminum: Lesson Plan Handouts to explore mechanistic link between Alzheimer's and aluminum 5. Brief proposal expanding Points to Aluminum's Link With Alzheimer's Disease" from 1989. Provide handout

Auerbach, Scott M.

136

Breath analysis science at PittCon 2012, Orlando, Florida  

Microsoft Academic Search

BackgroundBreath analysis science was featured in three organized sessions at this year's Pittsburgh Conference and Exposition, or 'PittCon 2012' (http:\\/\\/www.pittcon.org\\/). As described in previous meeting reports, PittCon is one of the largest international conferences for analytical chemistry and instrumentation, typically attracting about 20 000 attendees and 1000 commercial exhibitors (Pleil 2010, 2011). This year the conference was held in Orlando,

Joachim D Pleil; Matthew A Stiegel; Tzipporah M Kormos; Jon R Sobus

2012-01-01

137

Cómo hacer las gestiones con su plan de salud  

Cancer.gov

Hay formas de saber si su plan de salud cubre los costos de atención médica de rutina durante un estudio clínico. Esta información puede servirle para saber con quién comunicarse para solicitar ayuda, preguntas que puede hacer y la información que debe recoger y guardar si decide participar en un estudio clínico.

138

Redes Reconfigurables Controladas por Marcado: Redes de Petri con Cambios  

E-print Network

Redes Reconfigurables Controladas por Marcado: Redes de Petri con Cambios Din´amicos Estructurales a cambios din´amicos utilizando exten- siones de redes de Petri. En estudios previos, hemos introducido los siste- mas de reescritura de redes y una subclase de los mismos llamada redes reconfigurables. En un

Alpuente, María

139

con Diabetes Su diabetes s se puede controlar!  

E-print Network

Do Well, Be Well con Diabetes ¡Su diabetes sí se puede controlar! Educational programs of the Texas, and the County Commissioners Courts of Texas Cooperating. to develop diabetes self-care skills, to improve eating habits and maintain good nutrition, to increase physical activity, to prevent diabetes complications

140

Teaching after Retirement: The Pros and the Cons  

ERIC Educational Resources Information Center

Having enjoyed teaching during my active career, I continued to teach summer school following retirement. Self-observed sensory and cognitive impairments, although not mentioned by students in their evaluations, induced me to consider the pros and cons of continuing to teach. My hope is that this list of benefits and problems will be of assistance…

Sommer, Robert

2014-01-01

141

Applying Manure to Alfalfa Pros, Cons and Recommendations for  

E-print Network

Applying Manure to Alfalfa Pros, Cons and Recommendations for Three Application Strategies K and other Organic Wastes in Agriculture. It summarizes existing informa- tion on use of manure on alfalfa, Ohio #12;It's becoming increasingly common for livestock producers to apply manure to alfalfa

Balser, Teri C.

142

Portadores nasofaríngeos de Neisseria meningitidis en trabajadores con riesgo ocupacional  

Microsoft Academic Search

Los portadores de Neisseria meningitidis constituyen la principal fuente de infección y transmisión de la enfermedad meningocócica. Conocer su prevalencia, las características de las cepas aisladas y los factores de riesgos asociados con el estado de portador, aportan datos valiosos al control y vigilancia epidemiológica de esta entidad clínica. Para cumplimentar los objetivos propuestos se realizó un estudio transversal descriptivo

Isabel Martínez; Gustavo Sierra; Georgina Pardo; Niurka Álvarez; Marlene Armesto; Mayelín Mirabal

2010-01-01

143

FOTOPLETISMOGRAFÍA CON DIODOS LÁSER INFRARROJOS EN ÓRGANOS INTRAPERITONEALES DEL CERDO  

Microsoft Academic Search

1. Resumen. Entre las técnicas que se emplean para monitorizar órganos y tejidos se encuentran la fotopletismografía, la oximetría de pulso y la flujometría por efecto Doppler láser. Existen procesos que afectan a determinados órganos o territorios del organismo, sin repercusión significativa en el grado de oxigenación periférica, que no pueden ser monitorizados con los dispositivos disponibles actualmente. Resulta necesario

S. M. López Silva; J. P. Silveira Martín; L. Herrera; M. L. Dotor Castilla

144

In both climate states the changing oceanic heat con-  

E-print Network

of climate change. One driver of global weather patterns is the El Nino/La Nina cycle. El Nino refers warms. Dr. Curtis sees somewhat of a mixed signal using global satellite data sets. During both El NinoIn both climate states the changing oceanic heat con- tent affects the large scale atmospheric

145

In collaborazione con: CFA SOCIETY ITALY FUND MANAGEMENT CHALLENGE  

E-print Network

con le best-practices internazionali. Ogni squadra si impegna ad applicare il codice di deontologia professionale Code of Ethics and Standards of Professional Conduct promosso da CFA Institute, l CFA e CIPM. Il Code of Ethics and Standards of Professional Conduct, cui aderiscono tutti i membri CFA

Guidoni, Leonardo

146

Caracterización de tintas de titanio dopadas con óxidos metálicos  

Microsoft Academic Search

Se prepararon tintas de Diisopropoxido de titanio bis(acetilacetonato) por el método sol-gel para aplicar en la elaboración de nanoestructuras mediante la técnica de escritura directa. Esta técnica permite estructurar materiales con alto índice de refracción a escala micro y nanométrica en tres dimensiones mediante extrusión, para elaborar cristales fotónicos. El tratamiento de las nanoestructuras extruidas a temperaturas elevadas para transformarlas

C. R. TUBÍO; F. GUITIÁN; A. GIL

147

Some pros and cons of six sigma: an academic perspective  

Microsoft Academic Search

Six sigma is a powerful business strategy that employs a disciplined approach to tackle process variability using the application of statistical and non-statistical tools and techniques in a rigorous manner. This paper examines the pros and cons of six sigma in a detailed manner. This is followed by a section about the future of six sigma and its links to

Jiju Antony

2004-01-01

148

1. INTRODUCTION The MesoscaleAlpine Programme (MAP) was con-  

E-print Network

1. INTRODUCTION The MesoscaleAlpine Programme (MAP) was con- ducted over the European Alps the region, and moist air flows from the Mediterranean Sea toward the southern Alps. Dual-polarimetric Doppler and verti- cally pointing radar data collected during MAP on the Mediterranean side of the Alps

Houze Jr., Robert A.

149

The evolution of female mate choice by sexual con ict  

E-print Network

The evolution of female mate choice by sexual con ict Sergey Gavrilets1* , Go« ran Arnqvist2 sexual selection by female mate choice, our understanding of the adaptive value of female mating preferences is still very incomplete. It has recently been suggested that female mate choice may result from

Gavrilets, Sergey

150

Quantum computing: pro and con BY JOHN PRESKILL  

E-print Network

-tolerant procedures that enable a quantum computer with noisy gates to perform reliably. Quantum computing hardware will the quantum computers of the future use? Can this hardware be constructed via incremental improvementsQuantum computing: pro and con BY JOHN PRESKILL Charles C. Lauritsen Laboratory of High Energy

Preskill, John

151

Inclusion: The Pros and Cons--A Critical Review  

ERIC Educational Resources Information Center

The purpose of this paper was to review, analyze, and critique the pros and cons, the advantages and disadvantages, of inclusion. The methodology consisted in analyzing and comparing research findings on the benefits and costs of inclusion. Federal legislation and regulations on inclusion were examined, analyzed, and discussed. The results showed…

Savich, Carl

2008-01-01

152

NEWS & NOTES Jennifer Keeney's Trio Angelico will perform four con-  

E-print Network

NEWS & NOTES Jennifer Keeney's Trio Angelico will perform four con- certs December 1-9 in Japan- tion. Catherine Baker, Lindsay Fyffe, Sarah Giron, and Kasumi Nakashiima (studio of Jennifer Keeney) also participated. Antonia Rogers (studio of Jennifer Keeney and Krystal Grauvogl (studio of Timothy

Azevedo, Ricardo

153

-okfl ^ ORNL/CON-172 Linear Harmonic Analysis of Free-  

E-print Network

Stirling Engines N. C. J. Chen F. P. Griffin OPERATED BY MARTIN MARIETTA ENERGY SYSTEMS, INC. #12;ORNL/CON-172 Engineering Technology Division* LINEAR HARMONIC ANALYSIS OF FREE-PISTON STIRLING/dynamic problem that is associated with a free-piston Stirling engine (FPSE). The governing equations

Oak Ridge National Laboratory

154

Detail of conning tower atop the submarine. Note the wire ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail of conning tower atop the submarine. Note the wire rope wrapped around the base of the tower, which may have been used in an attempt to pull the submarine offshore. - Sub Marine Explorer, Located along the beach of Isla San Telmo, Pearl Islands, Isla San Telmo, Former Panama Canal Zone, CZ

155

performances, lectures, demonstra-tions, and workshops exploring con-  

E-print Network

promoted three major concerts in three different spaces. The opening event brought together the jazz of Frances Lynch, one of the few international singers to have worked closely with composers of electro- acoustic music. Her dramatic and most commited performances con- tinue to inspire many composers, not least

Miranda, Eduardo Reck

156

LunGradCon: The Lunar Graduate Conference  

NASA Astrophysics Data System (ADS)

Members of the Colorado Center for Lunar Dust and Atmospheric Studies (CCLDAS) initiated the Lunar Graduate Conference (LunGradCon), modeled after the highly successful Astrobiology Graduate Conference (AbGradCon). The purpose of this conference is to enhance the professional development of graduate students and early postdoctoral researchers by providing an opportunity to present and discuss scientific research in an environment of their peers. For the first two years, LunGradCon has been held as a one-day conference in conjunction with the NASA Lunar Science Institue's (NLSI) Lunar Science Forum at the NASA Ames Research Center. Activities include an invited overview talk on each of the NASA Lunar Science Institute's three main research areas (OF the Moon, ON the Moon, and FROM the Moon), submitted oral presentations from graduate students and postdoctoral researchers, and networking opportunities with established member of the lunar science community and the NLSI. In each of the first two years of LunGradCon, there have been 20-25 attendees, with about 15 of those presenting submitted talks. Each speaker received feedback forms from the other participants in order to improve on their presentation techniques. Participants also provided feedback on the conference as a whole in order to evaluate the content and provide suggestions for improvement in following years. Overall, the feedback has been extremely positive. This talk will summarize the achievements of past LunGradCons and plans for expansion of the conference to ensure a long-term positive impact on the early careers of future lunar, planetary and space science researchers.

Dove, A.; Poppe, A.; Neish, C.; Fagan, A.; Fuqua, H.; Kramer, G. Y.; Horanyi, M.

2011-12-01

157

CONTAMINACIÓN INDUSTRIAL CON SOLVENTES ORGÁNICOS COMO CAUSA DE TERATOGÉNESIS  

Microsoft Academic Search

Saavedra-Ontiveros D, Arteaga-Martínez M, Serrano-Medina B, Reynoso-Arizmendi F, Prada-Garay N, Cornejo-Roldán LR. Contaminación industrial con solventes orgánicos como causa de teratogénesis. Salud Publica Mex 1996;38:3-12. ABSTRACT Objective. To inform of a new teratogenic syndrome in human beings and its confirmation in rats. Material and Methods. The study comprised three phases: a field study; a case-control study; and a genetic epidemiology

DOLORES SAAVEDRA-ONTIVEROS; M. EN; MANUEL ARTEAGA-MARTÍNEZ; BEATRIZ SERRANO-MEDINA; FRANCISCO R EYNOSO-ARIZMENDI; NICOLÁS PRADA-GARAY; LAURA ROSA CORNEJO-ROLDÁN

158

The Pros and Cons of RFID in Supply Chain Management  

Microsoft Academic Search

This paper presents the pros and cons of using Radio-Frequency IDentification (RFID) in Supply Chain Management (SCM). While RFID has a greater number of benefits than its predecessor, the bar code, it currently comes at a price that many businesses still consider prohibitive. On the one hand, RFID is advantageous because it does not require line-of-sight scanning, it acts to

Katina Michael; Luke Mccathie

2005-01-01

159

French-Canadian translation of the WheelCon-M (WheelCon-M-F) and evaluation of its validity evidence using telephone administration.  

PubMed

Abstract Purpose: The objectives of this study were to: (1) translate the Wheelchair Use Confidence Scale for Manual Wheelchair Users (WheelCon-M) into a French-Canadian version (WheelCon-M-F); and (2) evaluate the WheelCon-M-F validity evidence based on response processes, internal structure, and relations with other variables. Methods: The WheelCon-M was translated from English to French using the Translation and Cultural Adaptation of Patient Reported Outcomes Measures - Principles of Good Practice guidelines. We used a test-retest design to examine the validity of the WheelCon-M-F with 24 community dwelling, experienced manual wheelchair users who had a variety of musculoskeletal and neurological diagnoses. Results: The mean?±?SD WheelCon-M-F score was 63.8?±?19.9. All WheelCon-M-F items were either identical or similar in meaning to the WheelCon-M items. Clarification issues were identified with 27/63 items. Cronbach's alpha was 0.98 and the retest intraclass correlation coefficient was 0.87. The standard error of measurement and smallest real difference were 7.2 and 19.9, respectively. There were no floor or ceiling effects. WheelCon-M-F correlations with social support and participation were r?=?0.54 and 0.78, respectively. Conclusions: The WheelCon-M-F is a valid outcome measure for assessing manual wheelchair confidence in the French-Canadian population. Implications for Rehabilitation The WheelCon-M-F is a valid outcome measure available for assessing wheelchair confidence, a modifiable barrier to wheelchair use. Translation of the WheelCon-M into the WheelCon-M-F allows collection of both clinical and research wheelchair confidence data using the two official Canadian languages, English and French. PMID:25039622

Rushton, Paula W; Routhier, François; Miller, William C; Auger, Claudine; Lavoie, Marie-Pier

2014-07-21

160

IZ-CON: an intelligent zone controller for building systems operation  

E-print Network

This paper describes the concept of an intelligent zone controller (IZ-CON) for integrated operation of building systems. IZ-CON is intended to deploy a predictive control methodology with embedded simulation capability. Thereby, the scalability...

Mahdavi, A.; Schub, M.

2012-01-01

161

A Feedback Controlled Stimulator That Delivers Con-trolled Displacements or Forces to Cutaneous  

E-print Network

66 A Feedback Controlled Stimulator That Delivers Con- trolled Displacements or Forces to Cutaneous as to be able to control force as well. The stimulator can be operated in the standard con- trolled displacement

Byrne, John H.

162

ESTUDIO OPINÁTICO DE LOS PACIENTES EN RELACIÓN CON LA ESCLEROSIS DE LAS VÁRICES QUIRÚRGICAS  

Microsoft Academic Search

quirúrgicas con solución esclerosante yodo-yodurada a concentraciones variables, mostrando quirúrgicas con solución esclerosante yodo-yodurada a concentraciones variables, mostrando quirúrgicas con solución esclerosante yodo-yodurada a concentraciones variables, mostrando quirúrgicas con solución esclerosante yodo-yodurada a concentraciones variables, mostrando preferencia por la escleroterapia y satisfacción al tratamiento sometido. Además consideramos preferencia por la escleroterapia y satisfacción al tratamiento sometido. Además consideramos preferencia por

Dra. Dulce; María Figueredo de Armas; Bárbara Reyes Iglesias

163

Recursos relacionados con los exámenes de detección del cáncer de cuello uterino  

Cancer.gov

El NCI tiene información completa y de base científica sobre prevención, exámenes selectivos de detección, diagnóstico, tratamiento, genética y cuidados de apoyo relacionados con el cáncer. Nuestros especialistas en información pueden responder preguntas relacionadas con el cáncer, entre ellas, las que tienen que ver con los exámenes de detección y el tratamiento del cáncer de cuello uterino. Puede comunicarse con nosotros por teléfono, correo electrónico o mensajería instantánea (el chat solo está disponible en inglés).

164

Where's the Beef? ConAgra's Approach to Energy Sources & Efficiency in Meat Processing  

E-print Network

ConAgra Foods, Inc. is a diversified international food company. ConAgra operating companies work interdependently across the food chain with 82,000 employees in 35 countries around the world. Sustainable development is a vital ConAgra business...

Kananen, T. M.

165

Apoyo a Estudios Geodinamicos con GPS en Guatemala  

NASA Astrophysics Data System (ADS)

El Instituto Geografico Nacional de Guatemala implemento 17 estaciones GNSS en el año 2009, como un proyecto de credito mixto de donacion de equipamiento del Gobierno de Suiza, el cual, este equipamiento de estaciones CORS GNSS es un sistema de recepción y transmisión de datos crudos GPS RInex que utiliza la tecnologia Spider Web de Leica, asi mismo este sistema esta sirviendo para el espablecimiento de un marco geodesico nacional de coordenadas geodesicas oficiales, el cual se calculan u obtienen las velocidades en tiempos temporales programados de las 17 Estaciones CORS. La infraestructura del marco geodesico de Guatemala esta sirviendo de base para las aplicaciones de estudios geodinamicos como el monitoreo de del desplazamiento de las placas tectonicas por medio de un estudio que se inicio en el año de 1999, llamado medicion con GPS el sistema de Fallas de los rios Polochic Motagua de Guatemala, tambien para un estudio que se implemento para deformación de corteza terrestre local en un Volcan Activo de Guatemala llamado Pacaya. Para el estudio de medicion con GPS en el sistema de falla de los Rios del polochic Motagua se implementaron 16 puntos para medir con GPS de dos frecuencias en el año de 1999, el cual, tres puntos son estaciones geodesicas CORS IGS llamados GUAT, ELEN y HUEH, despues en el año de 2003 se hizo otra medicion en un total de 20 puntos, que permitió calcular las velocidades de desplazamieinto de los puntos en mención, usando como referencia el modelo NUVEL 1A de DeMets de la placa de Norteamerica. Este estudio fue en cooperación internacional por la universidad de Nice de Francia y el IGNde Francia. Para el estudio del monitoreo con GPS del volcan activo de Guatemala, se implementaron cuatro puntos al rededor del volcan, el cual, se realizan cuatro mediciones al año, que permiten determinar axialmente la distancias entre los puntos, y rebisar estadisticamente cual es el comportamiento de las distancias en funcion del tiempo, si existen diferencias graduales crecientes o decrecientes, que nos da un indicativo del desplazamiento de la corteza terrestre al rededor del volcan.

Robles, V. R.

2013-05-01

166

El teatro como reflexión colectiva: Conversación con Sergio Corrieri  

E-print Network

grandes rasgos, por supuesto. Por nuestra convivencia en la zona y por los multiples canales naturales que eso nos brinda, nosotros estamos actualizados de la problemática. Aparte, con el tiempo, el Escambray ha ido perdiendo artistas particulares en el... gente del Escambray se nos queja. Uno de los aspectos más interesantes, a mi modo de ver, de la experiencia del Teatro Escambray es que todo este proceso se ha ido haciendo sobre la marcha, ha ido surgiendo, como tú decías hace poco, de la práctica...

Luzuriaga, Gerardo

1983-04-01

167

Do Well, Be Well with Diabetes 2013 1 Formulario de Conclusin para Personas con Diabetes Formulario de Conclusin para Personas con Diabetes 201  

E-print Network

Do Well, Be Well with Diabetes ­ 2013 1 Formulario de Conclusión para Personas con Diabetes Formulario de Conclusión para Personas con Diabetes ­ 201 Si usted NO TIENE diabetes, por favor NO LLENE este últimos cuatro números de mi número telefónico son __ __ __ __. C. Marque todas las clases sobre diabetes

168

Do Well, Be Well with Diabetes 2013 1 Formulario de Registro para Personas con Diabetes Formulario de Registro para Personas con Diabetes 2013  

E-print Network

Do Well, Be Well with Diabetes ­ 2013 1 Formulario de Registro para Personas con Diabetes Formulario de Registro para Personas con Diabetes ­ 2013 Si usted NO TIENE diabetes, por favor NO LLENE este sobre diabetes en el Condado de _______________. D. El código postal en mi casa es __ __ __ __ __. E

169

Cannabinoids and cancer: pros and cons of an antitumour strategy  

PubMed Central

In the last two decades, research has dramatically increased the knowledge of cannabinoids biology and pharmacology. In mammals, compounds with properties similar to active components of Cannabis sativa, the so called ‘endocannabinoids', have been shown to modulate key cell-signalling pathways involved in cancer cell growth, invasion and metastasis. To date, cannabinoids have been licensed for clinical use as palliative treatment of chemotherapy, but increased evidences showed direct antiproliferative actions of cannabinoid agonists on several tumour cells in vitro and in animal models. In this article, we will review the principal molecular pathways modulated by cannabinoids on cancer and summarize pros and cons evidence on the possible future use of endocannabinoid-based drugs in cancer therapy. PMID:16501583

Bifulco, Maurizio; Laezza, Chiara; Pisanti, Simona; Gazzerro, Patrizia

2006-01-01

170

RoboCon: Operator interface for robotic applications  

SciTech Connect

Carnegie Mellon U. and ORNL`s Robotics and Process Systems Division are developing a state-of-the-art robot operator control station (RoboCon) with standardized hardware and software control interfaces to be adaptable to a variety of remote and robotic equipment currently funded by DOE`s Office of Science & Technology Robotics Technology Development Program. The human operation and telerobotic and supervisory control of sophisticated and remote and robotic systems is a complex, tiring, and non-intuitive activity. Since decontamination & decommissioning, selective equipment removal, mixed waste operations, and in-tank cleanup are going to be a major future activity in DOE environmental restoration and waste management cleanup agenda, it seems necessary to utilize an operator control station and interface which maximizes operator comfort and productivity.

Schempf, H.; Warwick, J.; Fung, M.; Chemel, B.; Blackwell, M.

1996-12-31

171

NYC club to cogenerate with Con Ed's OK  

SciTech Connect

Consolidated Edison has given its first approval for a 120-kW cogeneration system at the Downtown Athletic Club because the club sized the project for peak shaving and plans to continue relying on the utility for supplemental rather than standby service at its former rate schedule. The two 60-kW Tecogen cogeneration units are part of a larger $268,000 energy conservation project that includes energy management systems, a powerline carrier system, and renovation of the building's condensate return system. Payback estimates for the investment are 18 months. The gas-fired cogeneration system will lower unit costs for fuel. Con Ed's opposition to other cogeneration projects focused on the problems of providing only standby power.

Berkovitch, E.

1985-07-22

172

Neogene sequence stratigraphy, Nam Con Son Basin, offshore Vietnam  

SciTech Connect

An integrated well log, biostratigraphic, and seismic stratigraphic study of Miocene to Recent deltaic sediments deposited in the Nam Con Son Basin offshore from southern Vietnam shows the influence of eustacy and tectonics on sequence development. Sediments consist of Oligocene non-marine rift-basin fill (Cau Formation), early to middle Miocene tide-dominated delta plain to delta front sediments (TB 1.5 to TB 2.5, Due and Thong Formations), and late Miocene to Recent marine shelf sediments (TB. 2.6 to TB 3.1 0, Mang Cau, Nam Con Son, and Bien Dong Formations). Eustacy controlled the timing of key surfaces and sand distribution in the tectonically-quiet early Miocene. Tectonic effects on middle to late Miocene sequence development consist of thick transgressive systems tracts due to basin-wide subsidence and transgression, sand distribution in the basin center, and carbonate sedimentation on isolated fault blocks within the basin. Third-order sequence boundaries (SB) are identified by spore peaks, sand stacking patterns, and channel incision. In the basin center, widespread shale beds with coal occur above sequence boundaries followed by transgressive sandstone units. These TST sandstones merge toward the basin margin where they lie on older HST sandstones. Maximum flooding surfaces (MFS) have abundant marine microfossils and mangrove pollen, a change in sand stacking pattern, and often a strong seismic reflection with downlap. Fourth-order genetic-type sequences are also interpreted. The MFS is the easiest marker to identify and correlate on well logs. Fourth-order SB occur within these genetic units but are harder to identify and correlate.

McMillen, K.J. (Beaver Creek Tech. Co., Mason, TX (United States)); Do Van Luu; Lee, E.K.; Hong, S.S. (PEDCO, Ho Chi Minh City (Viet Nam))

1996-01-01

173

Neogene sequence stratigraphy, Nam Con Son Basin, offshore Vietnam  

SciTech Connect

An integrated well log, biostratigraphic, and seismic stratigraphic study of Miocene to Recent deltaic sediments deposited in the Nam Con Son Basin offshore from southern Vietnam shows the influence of eustacy and tectonics on sequence development. Sediments consist of Oligocene non-marine rift-basin fill (Cau Formation), early to middle Miocene tide-dominated delta plain to delta front sediments (TB 1.5 to TB 2.5, Due and Thong Formations), and late Miocene to Recent marine shelf sediments (TB. 2.6 to TB 3.1 0, Mang Cau, Nam Con Son, and Bien Dong Formations). Eustacy controlled the timing of key surfaces and sand distribution in the tectonically-quiet early Miocene. Tectonic effects on middle to late Miocene sequence development consist of thick transgressive systems tracts due to basin-wide subsidence and transgression, sand distribution in the basin center, and carbonate sedimentation on isolated fault blocks within the basin. Third-order sequence boundaries (SB) are identified by spore peaks, sand stacking patterns, and channel incision. In the basin center, widespread shale beds with coal occur above sequence boundaries followed by transgressive sandstone units. These TST sandstones merge toward the basin margin where they lie on older HST sandstones. Maximum flooding surfaces (MFS) have abundant marine microfossils and mangrove pollen, a change in sand stacking pattern, and often a strong seismic reflection with downlap. Fourth-order genetic-type sequences are also interpreted. The MFS is the easiest marker to identify and correlate on well logs. Fourth-order SB occur within these genetic units but are harder to identify and correlate.

McMillen, K.J. [Beaver Creek Tech. Co., Mason, TX (United States); Do Van Luu; Lee, E.K.; Hong, S.S. [PEDCO, Ho Chi Minh City (Viet Nam)

1996-12-31

174

Gleevec disminuye la recidiva del cáncer en pacientes con tumor estromal gastrointestinal primario  

Cancer.gov

Los resultados preliminares de un estudio clínico grande aleatorio y controlado con placebo, en pacientes con tumor estromal gastrointestinal (GIST) primario, un tipo de tumor que por lo general se encuentra en el estómago o en el intestino delgado, demostraron que los pacientes a los que se administró mesilato de imatinib (Gleevec®) luego de la extirpación total de su tumor tuvieron una probabilidad significativamente menor de padecer una recidiva del cáncer en comparación con aquellos a los que no se administró imatinib.

175

Non Invasive Biomedical Analysis. Breath Networking Session at PittCon 2011, Atlanta, Georgia Non Invasive Biomedical Analysis. Breath Networking Session at PittCon 2011, Atlanta, Georgia  

Microsoft Academic Search

Background This was the second year that our breath colleagues organized a networking session at the Pittsburgh Conference and Exposition, or 'PittCon' (www.pittcon.org\\/). This time it was called 'Non Invasive Biomedical Analysis' to broaden the scope a bit, but the primary focus remained on exhaled breath diagnostics. As reported last year in the Journal of Breath Research, PittCon continues to

Joachim D. Pleil

2011-01-01

176

Pros, Cons, and Alternatives to Weight Based Cost Estimating  

NASA Technical Reports Server (NTRS)

Many cost estimating tools use weight as a major parameter in projecting the cost. This is often combined with modifying factors such as complexity, technical maturity of design, environment of operation, etc. to increase the fidelity of the estimate. For a set of conceptual designs, all meeting the same requirements, increased weight can be a major driver in increased cost. However, once a design is fixed, increased weight generally decreases cost, while decreased weight generally increases cost - and the relationship is not linear. Alternative approaches to estimating cost without using weight (except perhaps for materials costs) have been attempted to try to produce a tool usable throughout the design process - from concept studies through development. This paper will address the pros and cons of using weight based models for cost estimating, using liquid rocket engines as the example. It will then examine approaches that minimize the impct of weight based cost estimating. The Rocket Engine- Cost Model (RECM) is an attribute based model developed internally by Pratt & Whitney Rocketdyne for NASA. RECM will be presented primarily to show a successful method to use design and programmatic parameters instead of weight to estimate both design and development costs and production costs. An operations model developed by KSC, the Launch and Landing Effects Ground Operations model (LLEGO), will also be discussed.

Joyner, Claude R.; Lauriem, Jonathan R.; Levack, Daniel H.; Zapata, Edgar

2011-01-01

177

Influencia familiar sobre la conducta alimentaria y su relación con la obesidad infantil  

Microsoft Academic Search

RESUMEN. La conducta alimentaria es el conjunto de acciones que establecen la relación del ser humano con los alimentos. Se acepta generalmente que los comportamientos frente a la alimentación se adquieren a través de la experiencia directa con la comida, por la imitación de modelos, la disponibilidad de alimentos, el estatus social, los simbolismos afectivos y las tradiciones culturales. Además

Santos JL

178

Derivaciones perezosas en Programaci'on L'ogica con restricciones ecuacionales*  

E-print Network

Derivaciones perezosas en Programaci'on L'ogica con restricciones(H=E) a'una el estilo de programaci'on l'ogica basado en cl'ausulas de Horn, el paradigma* * basado en ecuaciones (condi- cionales) y la programaci'on con restricciones. Como n'ucleo de su sem

Alpuente, María

179

Diventa Social Media Trainer Aumenta le tue possibilit occupazionali con competenze Web 2.0 e  

E-print Network

Diventa Social Media Trainer · Aumenta le tue possibilità occupazionali con competenze Web 2.0 e marketing. Perché partecipare: · Riceverai una Formazione per diventare un Social Media Trainer formative, aiutando un membro dello staff aziendale a familiarizzare con gli strumenti Social Media. Questo

Robbiano, Lorenzo

180

ConPor: um modelo de gerao conceitual para o Lucia Specia, Lucia Helena Machado Rino  

E-print Network

ConPor: um modelo de geração conceitual para o português Lucia Specia, Lucia Helena Machado Rino ­ 13565-905 ­ São Carlos ­ SP ­ Brasil {lspecia,lucia}@dc.ufscar.br Abstract. This paper describes Con

Specia, Lucia

181

Dos casos de intoxicación por contaminación de maíz con Datura stramonium en ganado vacuno  

Microsoft Academic Search

Resumen: Recientemente hemos observado dos intoxicaciones en ganado vacuno lechero, en granjas de Cataluña, debidas a la ingestión de estramonio (Datura stramonium). La planta había sido en ambos casos erróneamente recolectada junto con el maíz empleado para la alimentación de los animales. El cuadro fue leve y, básicamente, cursó con problemas digestivos y descenso en la producción lechera, y remitió

Bofill FX; Bofill J

2007-01-01

182

ccsd00001226 Ultracold atoms con ned in rf-induced two-dimensional trapping potentials  

E-print Network

ccsd­00001226 (version 1) : 29 Feb 2004 Ultracold atoms con#12;ned in rf-induced two atoms proposed by O. Zobay and B. M. Garraway [1]. It relies on adiabatic potentials for atoms dressed by a rf #12;eld in an inhomogeneous magnetic #12;eld. This trap is well suited to con#12;ne atoms tightly

183

La salud en personas con discapacidad intelectual en España: estudio europeo POMONA-II  

PubMed Central

Introducción Estudios internacionales demuestran que existe un patrón diferenciado de salud y una disparidad en la atención sanitaria entre personas con discapacidad intelectual (DI) y población general. Objetivo Obtener datos sobre el estado de salud de las personas con DI y compararlos con datos de población general. Pacientes y métodos Se utilizó el conjunto de indicadores de salud P15 en una muestra de 111 sujetos con DI. Los datos de salud encontrados se compararon según el tipo de residencia de los sujetos y se utilizó la Encuesta Nacional de Salud 2006 para comparar estos datos con los de la población general. Resultados La muestra con DI presentó 25 veces más casos de epilepsia y el doble de obesidad. Un 20% presentó dolor bucal, y existió una alta presencia de problemas sensoriales, de movilidad y psicosis. Sin embargo, encontramos una baja presencia de patologías como la diabetes, la hipertensión, la osteoartritis y la osteoporosis. También presentaron una menor participación en programas de prevención y promoción de la salud, un mayor número de ingresos hospitalarios y un uso menor de los servicios de urgencia. Conclusiones El patrón de salud de las personas con DI difiere del de la población general, y éstas realizan un uso distinto de los servicios sanitarios. Es importante el desarrollo de programas de promoción de salud y de formación profesional específicamente diseñados para la atención de personas con DI, así como la implementación de encuestas de salud que incluyan datos sobre esta población. PMID:21948011

Martínez-Leal, Rafael; Salvador-Carulla, Luis; Gutiérrez-Colosía, Mencía Ruiz; Nadal, Margarida; Novell-Alsina, Ramón; Martorell, Almudena; González-Gordón, Rodrigo G.; Mérida-Gutiérrez, M. Reyes; Ángel, Silvia; Milagrosa-Tejonero, Luisa; Rodríguez, Alicia; García-Gutiérrez, Juan C.; Pérez-Vicente, Amado; García-Ibáñez, José; Aguilera-Inés, Francisco

2011-01-01

184

Soluciones analiticas AL problema de jets con velocidad de eyeccion variable EN EL tiempo  

Microsoft Academic Search

Se presenta un nuevo metodo que permite resolver de manera exacta y analitica las ecuaciones que describen un jet hipersonico con velocidad de eyeccion variable en el tiempo. El metodo se basa en consideraciones sencillas de conservacion de momento para las superficies de trabajo que se forman en el interior del jet. Como ejemplo, se presentan soluciones para jets con

J. Canto; A. C. Raga; P. D'Alessio

1998-01-01

185

Estimación de observaciones faltantes en series de tiempo usando métodos multivariados con restricciones  

Microsoft Academic Search

Para tener éxito en el modelamiento de cualquier fenómeno físico, es importante disponer de una fuente de información completa. En este documento se plantea la reconstrucción o estimaci´on de observaciones faltantes en series de tiempo múltiples, siguiendo la metodología de Guerrero (1989) de pron´osticos con restricciones, las cuales vienen dadas por información adicional relacionada con el modelo que tiene en

María Ana Velásquez Gallo; Jorge Martínez Collantes

2010-01-01

186

Accesibilidad para personas con debilidad auditiva Mac OS X Snow Leopard  

E-print Network

Accesibilidad para personas con debilidad auditiva Mac OS X Snow Leopard ASIC ­ 18 de noviembre de LEOPARD MAC OS X Snow Leopard ofrece algunas ayudas para personas sordas o con problemas para escuchar Snow Leopard ASIC ­ 18 de noviembre de 2010 Pág. 2 de 14 1. Recomendaciones previas frente al uso del

Fernández de Córdoba, Pedro

187

Accesibilidad para personas con debilidad motriz Mac Os X Snow Leopard  

E-print Network

Accesibilidad para personas con debilidad motriz Mac Os X Snow Leopard ASIC ­ 18 de noviembre de LEOPARD Si usted tiene problemas para utilizar el teclado, el ratón o el trackpad de su portátil, puede para personas con debilidad motriz Mac Os X Snow Leopard ASIC ­ 18 de noviembre de 2010 Pág. 2 de 9

Fernández de Córdoba, Pedro

188

PROBLEMAS DE CONDUCTA EN EL NIÑO CON TDAH: ESTRATEGIAS DE INTERVENCIÓN EN EL AULA  

Microsoft Academic Search

Los estudios epidemiológicos revelan que el Trastorno por Déficit de Atención con o sin hiperactividad se presenta en un 3 hasta un 6% de los niños en edad escolar por lo tanto, en un aula de educación primaria o secundaria podemos encontrar la razonable cifra de 1 o 2 niños con este trastorno. La sintomatología del TDAH implica dos bloques

Isabel Orjales Villar

189

LA COLABORACIÓN ENTRE PEDIATRAS Y PSICÓLOGOS EN EL DIAGNÓSTICO Y TRATAMIENTO DE NIÑOS CON TDAH  

Microsoft Academic Search

En los Estados Unidos, está aumentando la carencia de psiquiatras, y pacientes con necesidad de medicación psicotrópica a menudo se enfrentan a largas esperas y servicios limitados. Para disminuir la brecha creciente entre la oferta y la demanda, están incorporán- dose personas con capacidad para prescribir, formadas fuera de los escenarios médicos tradicionales. A pesar de que tradicional- mente los

George M. Kapalka

190

Meeting Report: Breath Biomarkers Networking Sessions at PittCon 2010, Orlando, Florida  

EPA Science Inventory

The Pittsburgh Conference and Exposition, or "PittCon" (www.pittcon.org/), is one of the largest international conferences for analytical chemistry and instrumentation typically attracting about 25,000 attendees and 1,000 commercial exhibitors. PittCon began in 1950 as a small sp...

191

in collaborazione con: Sovraintendenza ai Beni Culturali del Comune di Roma  

E-print Network

in collaborazione con: Sovraintendenza ai Beni Culturali del Comune di Roma con il patrocinio di l'Università `La Sapienza' di Roma ed ha come obiettivo la formazione del lighting designer e del-Tokyo, Artemide-Dubai, Regent-Basilea, Studio Fabertechnica S.a.S-Roma, Studio Annunziata&Terzi-Roma, Studio GMS

Di Pillo, Gianni

192

Bienvenidos a Columbia Dental: En Columbia Dental estamos comprometidos en proveerle con cuidado dental de altura.  

E-print Network

departamentos especializados, incluyendo Implantes Dentales. Su primera cita en Columbia Dental será con unBienvenidos a Columbia Dental: En Columbia Dental estamos comprometidos en proveerle con cuidado dental de altura. Columbia Dental le ofrece una amplia variedad de servicios dentales en todos nuestros

Grishok, Alla

193

Los regímenes monetarios con paridades irrevocablemente fijas: algunas reflexiones de la experiencia argentina  

Microsoft Academic Search

Resumen. Recientemente, ha habido en distintas economías periféricas intentos por im- plantar sistemas cambiarios con paridades irrevocablemente fijas. Este artículo expone brevemente las ventajas y desventajas que, teóricamente, cabe esperar de los mismos. Con esta base teórica, se analiza el régimen cambiario argentino de los años noventa (conocido como currency-board). Se concluye que el fracaso final del mismo se debe

Daniel Coq Huelva

2007-01-01

194

iCons students work on science problems that capture their interest and prepare them for  

E-print Network

generation of technology leaders by focusing on problem-based learning. Through courses in the 18-credit, four-year concentration, students use scientific methods in a team environment where communication class of iCons scholars launched their iCons careers by studying cholera in Haiti, the impact

Auerbach, Scott M.

195

BriTTen fesTival ClassiC ConCerT series  

E-print Network

SeaSon 07 th The UniversiTy of ChiCago presenTs 2o13/14 ConCerT series #12;BriTTen fesTival ClassiC ConCerT series early mUsiC series paCifiCa qUarTeT ConTempo jazz aTThe logan mUsiC aCross genres during the season, create a Flexible series from the delightful array of Chicago Presents concerts

Butler, Laurie J.

196

LA TERAPIA FACILITADA POR ANIMALES DE COMPAÑÍA COMO PROGRAMA DE REHABILITACIÓN ADJUNTO PARA PERSONAS CON DIAGNÓSTICO DE ESQUIZOFRENIA CRÓNICA  

Microsoft Academic Search

Coincidiendo con el surgimiento de la psiquiatría comunitaria, ha habido un progresivo proceso de desinstitucionalización de los pacientes psiquiátricos; seleccionando a los menos discapacitados para los recursos comunitarios y dejando los pacientes con más discapacidad al cuidado de las instituciones. La rehabilitación pretende afrontar la discapacidad para realizar actividades, con la finalidad de mejorar la desventaja social consecuencia del deterioro

Victoria Villalta Gil; Susana Ochoa Güerre

2007-01-01

197

SimpCon a Simple and Efficient SoC Interconnect Martin Schoeberl  

E-print Network

definition from ARM. The specification defines three different busses: Advanced High-performance Bus (AHB, cache, and external memory to the processor. Peripheral devices are con- nected to the APB. A bridge

198

Propuesta de Proyecto Fin de Carrera o Grado Implementacin de una aplicacin web con  

E-print Network

Propuesta de Proyecto Fin de Carrera o Grado Implementación de una aplicación web con soporte WPS Service (WPS) del Open Geospatial Consortium (OGC), en el que se publicarán distintos algoritmos que

Fraguela, Basilio B.

199

UNIDAD GUADALAJARA La Unidad Guadalajara del Cinvestav se inici el 14 de noviembre de 1988 con  

E-print Network

Comercio y Fomento Indus- trial. Este proyecto fue parte del Programa de Transferencia de Tecnología al desarrollo tecnológico con las compañías más im- portantes de la industria electrónica internacional

200

UNIDAD GUADALAJARA La Unidad Guadalajara del Cinvestav se inici el 14 de noviembre de 1988 con  

E-print Network

Comercio y Fomento Indus- trial. Este proyecto fue parte del Programa de Transferencia de Tecnología al desarrollo tecnológico con las compañías más im- portantes de la industria electrónica internacional. Los

201

Sub-Workflow Interoperability, the Pros and Cons Beth Plale1  

E-print Network

Sub-Workflow Interoperability, the Pros and Cons Beth Plale1 , Yuan Luo1 is run on one system and another portion on another system. As with social media sites, working within a single framework can be limiting. Interoperability

Plale, Beth

202

algunos estimadores "naturales", junto con diversas propiedades de interes (sesgo, varianza, ECM);  

E-print Network

-2015 October 30, 2014 1 / 22 #12;Derivadas de funciones de densidad/masa Variable X con funci´on de densidad funci´on de densidad conjunta f (x; ) dada por f (x; ) = n j=1 f (xj ; ), con x = (x1, . . . , xn) sopn densidad es f (x; ) = 1 e-x/ , para x > 0 . Obs´ervese que E(X) = (1/) = y que V(X) = (1/2) = 2. Como ln

Fernández Gallardo, Pablo

203

ConPAHS - a software package for control of piecewise-affine hybrid systems  

Microsoft Academic Search

The software package ConPAHS facilitates control design of continuous-time piecewise-affine hybrid systems on polytopes. For the control objective of reaching a particular state from a specified initial state, the output of the package is a piecewise-affine control law. After a short review of the control theory for this problem, the paper presents the functional specification of ConPAHS, the objected oriented

Pieter Collins; Anton Kuut; Margreet Nool; Mihaly Petreczky; Jan H. van Schuppen

2006-01-01

204

Estudio de los NIH señala una relación de la tomografía computarizada (TC) en la infancia con leucemia y con cáncer de cerebro más tarde  

Cancer.gov

Niños y adultos jóvenes a quienes se les hicieron exploraciones muchas veces con tomografía computarizada (TC), una herramienta de diagnóstico de uso frecuente, tienen un riesgo ligeramente mayor de padecer leucemia y tumores cerebrales en la década posterior a su primera tomografía.

205

Evaluation of the ACT*DE*CON{sup SM} process for treating gunite tank sludge  

SciTech Connect

A test was conducted to evaluate this process for selectively removing actinides from Gunite tank sludge. Mixed waste sludge from Gunite tank W-6 was subjected to the ACT*DE*CON selective leaching process. (Nearly all the TRU content was attributed to Pu.) The sludge sample was first washed with 0.01M NaOH to remove excess sodium and nitrate in the interstitial liquid supernatant. The washed wet solids were treated with the ACT*DE*CON solvent (aqueous carbonate solution containing a chelating agent and an oxidant), using a ratio of 20 ml solvent per gram wet solids. Sludge and solvent were separated by centrifugation, and the ACT*DE*CON treatment was repeated twice. Analyses showed that 71% of the solids in the sludge were dissolved while 80% of the TRU-waste components dissolved. Low separation of the TRU-waste components from other components of the sludge mixture is indicated. Almost all the U and Ca were removed from the sludge. For sludges where most of the TRU content is Pu, the ACT*DE*CON process as tested is not effective in rendering the sludge a non-TRU waste. It is recommended that ACT*DE*CON be optimized for this specific application and that other processes using different chelating and oxidizing agents be tested. Also, the ACT*DE*CON process should be tested on TRU mixed waste in which most of the TRU elements are not Pu.

Spencer, B.B.; Chase, C.W.; Egan, B.Z.

1996-05-01

206

SLUDGE PARTICLE SEPAPATION EFFICIENCIES DURING SETTLER TANK RETRIEVAL INTO SCS-CON-230  

SciTech Connect

The purpose of this document is to release, into the Hanford Document Control System, FA1/0991, Sludge Particle Separation Efficiencies for the Rectangular SCS-CON-230 Container, by M. Epstein and M. G. Plys, Fauske & Associates, LLC, June 2009. The Sludge Treatment Project (STP) will retrieve sludge from the 105-K West Integrated Water Treatment System (IWTS) Settler Tanks and transfer it to container SCS-CON-230 using the Settler Tank Retrieval System (STRS). The sludge will enter the container through two distributors. The container will have a filtration system that is designed to minimize the overflow of sludge fines from the container to the basin. FAI/09-91 was performed to quantify the effect of the STRS on sludge distribution inside of and overflow out of SCS-CON-230. Selected results of the analysis and a system description are discussed. The principal result of the analysis is that the STRS filtration system reduces the overflow of sludge from SCS-CON-230 to the basin by roughly a factor of 10. Some turbidity can be expected in the center bay where the container is located. The exact amount of overflow and subsequent turbidity is dependent on the density of the sludge (which will vary with location in the Settler Tanks) and the thermal gradient between the SCS-CON-230 and the basin. Attachment A presents the full analytical results. These results are applicable specifically to SCS-CON-230 and the STRS filtration system's expected operating duty cycles.

DEARING JI; EPSTEIN M; PLYS MG

2009-07-16

207

Concomitant administration of GonaCon™ and rabies vaccine in female dogs (Canis familiaris) in Mexico.  

PubMed

Mexico serves as a global model for advances in rabies prevention and control in dogs. The Mexican Ministry of Health (MMH) annual application of approximately 16 million doses of parenteral rabies vaccine has resulted in significant reductions in canine rabies during the past 20 years. One collateral parameter of rabies programs is dog population management. Enhanced public awareness is critical to reinforce responsible pet ownership. Surgical spaying and neutering remain important to prevent reproduction, but are impractical for achieving dog population management goals. GonaCon™, an anti-gonadotropin releasing hormone (GnRH) vaccine, was initially tested in captive female dogs on the Navajo Nation, 2008. The MMH led this international collaborative study on an improved formulation of GonaCon™ in captive dogs with local representatives in Hidalgo, Mexico in 2011. This study contained 20 bitches assigned to Group A (6 control), Group B (7 GonaCon™), and Group C (7 GonaCon™ and rabies vaccine). Vaccines were delivered IM. Animals were placed under observation and evaluated during the 61-day trial. Clinically, all dogs behaved normally. No limping or prostration was observed, in spite of minor muscle atrophy post-mortem in the left hind leg of dogs that received GonaCon™. Two dogs that began the study pregnant give birth to healthy pups. Dogs that received a GonaCon™ injection had macro and microscopic lesions consistent with prior findings, but the adverse injection effects were less frequent and lower in intensity. Both vaccines were immunogenic based on significant increases in rabies virus neutralizing antibodies and anti-GnRH antibodies in treatment Groups B and C. Simultaneous administration of GonaCon™ and rabies vaccine in Group C did not affect immunogenicity. Progesterone was suppressed significantly in comparison to controls. Future studies that monitor fertility through multiple breeding cycles represent a research need to determine the value of integrating this vaccine into dog rabies management. PMID:23871822

Vargas-Pino, Fernando; Gutiérrez-Cedillo, Verónica; Canales-Vargas, Erick J; Gress-Ortega, Luis R; Miller, Lowell A; Rupprecht, Charles E; Bender, Scott C; García-Reyna, Patricia; Ocampo-López, Juan; Slate, Dennis

2013-09-13

208

Virulence, Speciation and Antibiotic Susceptibility of Ocular Coagualase Negative Staphylococci (CoNS)  

PubMed Central

Background: Coagulase negative Staphylococci (CoNS) are common inhabitants of human skin and mucous membranes. With the emergence of these organisms as prominent pathogens in patients with ocular infections, investigation has intensified in an effort to identify important virulence factors and to inform new approaches to treatment and prevention. Aim: To isolate CoNS from ocular specimens; to study the possible virulence factors; speciation of coagulase negative staphylococci (CoNS) which were isolated from ocular complications; antibiotic susceptibility testing of ocular CoNS. Materials and Methods: The specimens were collected from the target patients who attended the Microbiology Laboratory of a tertiary care eye hospital in Coimbatore, Tamilnadu state, India. The isolates were subjected to tube and slide coagulase tests for the identification of CoNS. All the isolates were subjected to screening for lipase and protease activities. Screening for other virulence factors viz., slime production on Congo red agar medium and haemagglutination assay with use of 96-well microtitre plates. These isolates were identified upto species level by performing biochemical tests such as phosphatase test, arginine test, maltose and trehalose fermentation tests and novobiocin sensitivity test. The isolates were subjected to antibiotic susceptibility studies, based on the revised standards of Clinical and Laboratory Standards Institutes (CLSI). Results: During the one year of study, among the total 260 individuals who were screened, 100 isolates of CoNS were obtained. Lipolytic activity was seen in all the isolates, whereas 38 isolates showed a positive result for protease. A total of 63 isolates showed slime production. Of 100 isolates, 30 isolates were analyzed for haemagglutination, where 4 isolates showed the capacity to agglutinate the erythrocytes. The results of the biochemical analysis revealed that of the 100 isolates of CoNS, 43% were Staphylococcus epidermidis. The other isolates were identified as S. xylosus (n=8), S. captis (n=16), S. haemolyticus (n=10), S. saccharolyticus (n=2), S. hominis (n=5), S. saprophyticus (n=6) and S. intermedius (n=1). On the other hand, 9 isolates were not identified. In the antibiotic susceptibility analysis, it was found that most of the isolates were sensitive to vancomycin, amikacin and linczolid and resistant to cefatoxime, oxacillin, bacitracin and nalidixic acid. Conclusion: S. epidermidis was found to be predominant in causing the ocular complications. Slime production, heamagglutination, protease and lipase activities could be the putative virulence factors of CoNS. Antibiotic susceptibility patterns of CoNS against antibacterial agents revealed maximum resistance to beta lactam groups, and the resistance was found to be higher to oxacillin, and lowest to vancomycin. PMID:24995181

Priya, Ravindran; Mythili, Arumugam; Singh, Yendremban Randhir Babu; Sreekumar, Haridas; Manikandan, Palanisamy; Panneerselvam, Kanesan

2014-01-01

209

ConA-based glucose sensing using the long-lifetime azadioxatriangulenium fluorophore  

NASA Astrophysics Data System (ADS)

Fluorescent glucose sensing technologies have been identified as possible alternatives to current continuous glucose monitoring approaches. We have recently introduced a new, smart fluorescent ligand to overcome the traditional problems of ConA-based glucose sensors. For this assay to be translated into a continuous glucose monitoring device where both components are free in solution, the molecular weight of the smart fluorescent ligand must be increased. We have identified ovalbumin as a naturally-occurring glycoprotein that could serve as the core-component of a 2nd generation smart fluorescent ligand. It has a single asparagine residue that is capable of displaying an N-linked glycan and a similar isoelectric point to ConA. Thus, binding between ConA and ovalbumin can potentially be monovalent and sugar specific. This work is the preliminary implementation of fluorescently-labeled ovalbumin in the ConA-based assay. We conjugate the red-emitting, long-lifetime azadioxatriangulenium (ADOTA+) dye to ovalbumin, as ADOTA have many advantageous properties to track the equilibrium binding of the assay. The ADOTA-labeled ovalbumin is paired with Alexa Fluor 647-labeled ConA to create a Förster Resonance Energy Transfer (FRET) assay that is glucose dependent. The assay responds across the physiologically relevant glucose range (0-500 mg/dL) with increasing intensity from the ADOTA-ovalbumin, showing that the strategy may allow for the translation of the smart fluorescent ligand concept into a continuous glucose monitoring device.

Cummins, Brian; Simpson, Jonathan; Gryczynski, Zygmunt; Sørensen, Thomas Just; Laursen, Bo W.; Graham, Duncan; Birch, David; Coté, Gerard

2014-02-01

210

Pliocene to recent stratigraphy of the Cuu Long and Nam Con Son Basins, offshore Vietnam  

E-print Network

. Cuu Long and Nam Con Son Basin boundaries are indicated by dashed lines. Division of the Nam Con Son Basin into East and West sub- basins is not shown. 37 Well Log Analysis Well 04-A-1X (Figure 10) provided gamma...-ray measurements and lithostratigraphic picks based on microfossils. Sequence boundaries for LP 1 through UP-R 4 and maximum flooding surfaces (mfs) for LP 1 through 4 were identified in the gamma-ray well log. Sequence boundary and maximum flooding surface...

Yarbrough, Christopher Neil

2006-08-16

211

Un estudio financiado por los Institutos Nacionales de la Salud (NIH) muestra reducción en la mortalidad entre hombres con cáncer de próstata en grado intermedio:  

Cancer.gov

Terapia hormonal por corto tiempo administrada en combinación con radioterapia a hombres con cáncer de próstata en estadio inicial aumentó sus posibilidades de vivir más en comparación con tratamiento de radioterapia sola, según un estudio clínico patrocinado por el NCI. Los beneficios del tratamiento combinado se limitaron principalmente a pacientes con enfermedad de riesgo intermedio y no se observaron en hombres con cáncer de próstata de riesgo bajo, indican los investigadores.

212

Annotating Web Images using NOVA: NOn-conVex group College of Computer Science,  

E-print Network

Annotating Web Images using NOVA: NOn-conVex group spArsity Fei Wu College of Computer Science, NOVA is the first to introduce non-convex penalty for group selection in high-dimensional heterogeneous it uses non-convex penalty, it achieves the consistency. We demonstrate the superior performance of NOVA

Rui, Yong

213

A Static Analysis for Instance-based Con nement in Java [Extended version, 30 Nov 01  

E-print Network

of Technology Hoboken, NJ 07030 USA naumann@cs.stevens-tech.edu Abstract. A semantic de#12;nition is given for instance-based pointer con- #12;nement (alias control); this provides a form of encapsulation suited#12;ts of object-oriented programming is information hiding and encapsulation: classes and visibility

Banerjee, Anindya

214

Desactivar la conducta de miedo con seguridad percibida Karyn B. Purvis  

E-print Network

Desactivar la conducta de miedo con seguridad percibida Karyn B. Purvis David R. Cross Wendy L conductas perturbadoras (rabietas, esconderse, hiperactividad o agresividad) suelen ser consecuencia del desencadenar terror que, a su vez, da lugar a una conducta descontrolada. El miedo crónico es como el abusón

Cooper, Brenton G.

215

MEDIDA DE LA CSF CROMTICA Y ACROMTICA CON MONITORES ORDINARIOS PARA PRCTICAS DE LABORATORIO  

E-print Network

comerciales, de prestaciones inferiores, que presentan problemas para generar estímulos para experimentos distinguir la red de un campo uniforme. La CSF se obtiene como la inversa del contraste global en el espacio imposibilita su uso durante un experimento, por lo que trabajamos con estímulos pre-calculados. MEDIDA El

Escolano, Francisco

216

owi'3:%l OORNL/CON-75 Effect of Forced Ventilation on  

E-print Network

owi'3:%l OORNL/CON-75 Effect of Forced Ventilation on House Infiltration *CARBIDE W. P. Levins #12-eng-26 Energy Division EFFECT OF FORCED VENTILATION ON HOUSE INFILTRATION W. P. Levins DEPARTMENT 1980). v #12;EFFECT OF FORCED VENTILATION OF HOUSE INFILTRATION W. P. Levins Energy Division ABSTRACT

Oak Ridge National Laboratory

217

Iron formations are typically thinly bed-ded or laminated sedimentary rocks con-  

E-print Network

222 ABSTRACT Iron formations are typically thinly bed- ded or laminated sedimentary rocks con- taining 15% or more of iron and a large pro- portion of silica (commonly >40%). In the ca. 2590­2460 Ma Campbellrand-Kuruman Complex, Transvaal Supergroup, South Africa, iron formation occurs as a sediment- starved

Fischer, Woodward

218

UNIDAD GUADALAJARA La Unidad Guadalajara del Cinvestav se inici en noviembre de 1988 con el  

E-print Network

maestría y doctorado en la especialidad de Ingeniería Eléctrica con opción en Telecomunicaciones, y en telecomunicaciones. En su quinto año de vida, los programas académicos han seguido su camino hacia la consolidación y se encuentran ahora en la etapa de caracterización y pruebas. El grupo de telecomunicaciones

219

UNIDAD GUADALAJARA La Unidad Guadalajara del Cinvestav se inici en noviembre de 1988 con el  

E-print Network

maestría y doctorado en la especialidad de Ingeniería Eléctrica con opción en Telecomunicaciones, y en telecomunicaciones. En su cuarto año de vida, los programas académicos han seguido su camino hacia la consolidación y se encuentran ahora en la etapa de caracterización y pruebas. El grupo de telecomunicaciones

220

Percepciones y prácticas relacionadas con la tuberculosis y la adherencia al tratamiento en Chiapas, México  

Microsoft Academic Search

Objective. To identify health perceptions and practices and non-adherence to therapy among tuberculosis patients. Material and methods. Qualitative research work con- sisting of 11 group interviews with 62 tuberculosis patients during 1997-1998 in the Central, Highlands, and Border Regions of Chiapas, Mexico. Results. Perceived causes of tuberculosis included contagion via food utensils, excess work, malnutrition, and cold, as well as

Guadalupe del Carmen Alvarez-Gordillo; Julio Félix Alvarez-Gordillo; José Eugenio Dorantes-Jiménez; David Halperin-Frisch

2000-01-01

221

pag. 1S. Marsili-Libelli: Introduzione ai Fuzzy Sets Ragionamento approssimato con  

E-print Network

pag. 1S. Marsili-Libelli: Introduzione ai Fuzzy Sets Ragionamento approssimato con concetti definiti in modo vago #12;pag. 2S. Marsili-Libelli: Introduzione ai fuzzy sets E' più importante la precisione o il significato? #12;pag. 3S. Marsili-Libelli: Introduzione ai fuzzy sets Valori Crisp e Fuzzy

222

The Value of Literacy Beyond Reading: Empowering Adult Women Through Knowledge and Con...dence  

E-print Network

this knowledge. We ...nd that literacy improves knowledge of politics, health and edu- cation. As fewThe Value of Literacy Beyond Reading: Empowering Adult Women Through Knowledge and Con funded by the Social Science Research Council of Canada. 1 #12;Abstract Adult female literacy

Bandyopadhyay, Antar

223

ConMap: Investigating New Computer-Based Approaches to Assessing Conceptual Knowledge Structure in Physics.  

ERIC Educational Resources Information Center

There is a growing consensus among educational researchers that traditional problem-based assessments are not effective tools for diagnosing a student's knowledge state and for guiding pedagogical intervention, and that new tools grounded in the results of cognitive science research are needed. The ConMap ("Conceptual Mapping") project, described…

Beatty, Ian D.

224

Although most Minnesota airports do not have much concrete pavement, the con-  

E-print Network

Although most Minnesota airports do not have much concrete pavement, the con- crete they do have constructed of concrete are parking lots and sidewalks, for which the concrete is typically 4 to 6 inches thick. However, several general avi- ation airports do have concrete aprons and runways, which

Minnesota, University of

225

Research Profile Research conducted by the Polymer Technology Group is con-  

E-print Network

-conducting Organics, Polymetals MRCMaterials Research Center Crystals of a fullerene derivative growing from a glassy fundamental con- cepts for the rational design of nucleating/clarifying agents. Polymetals A new route-conducting Polymers Currently available polymer semiconductors often are brittle and environmentally relatively

Sandoghdar, Vahid

226

conStruction MAnAgeMent College of Rural and Community Development  

E-print Network

The construction management program meets growing needs in the con- struction industry by training entry to the largest of skyscrapers and industrial projects; and on rural roads to major highways. Construction principles of busi- ness and know about the technical aspects of the construction industry. Graduates

Hartman, Chris

227

DESign AnD conStruction College of Engineering and Mines  

E-print Network

in the construction industry. The program was designed in collaboration with construction industry em- ployers and continues to engage industry as a partner in the program. Engineers and other construction professionalsDESign AnD conStruction MAnAgEMEnt College of Engineering and Mines Department of Civil

Hartman, Chris

228

A Qualitative Approach to Upward Evaluation of Leadership Performance: Pros and Cons  

ERIC Educational Resources Information Center

This article describes a qualitative upward evaluation of the leadership performance of library managers. Follow-up studies were conducted, focusing on the advantages and disadvantages of the qualitative approach to upward appraisal. The authors discuss pros and cons to guide others who might use this methodology for upward appraisals in the…

Turrentine, Cathryn G.; Lener, Edward F.; Young, Michelle L.; Kok, Victoria T.

2004-01-01

229

utilization of xylooligosaccharides by this Strains of S. ruminantium varied con-  

E-print Network

and arabinose). Lactic acid was the major fermentation product formed by all strains. The ability of S, Ra or Nf. The phenolic acid con- tent of the residues and the fermented su- pematants was determined- siderably in their capacity to ferment xy- looligosaccharides prepared by partial hy- drolysis of oat spelt

Paris-Sud XI, Université de

230

A Centralized System to Access Acute Healthcare Services: The Pros and Cons  

Microsoft Academic Search

Having a centralized access service results in a daily interconnectedness between hospital sites, which can create many benefits but also much controversy. Knowing the pros and cons of a centralized service and understanding the role and work environment of the access coordinator will assist you in deciding if this service would be of benefit to your health region. In this

Susan Brown

2005-01-01

231

Onion Routing Access Con gurations Paul F. Syverson, Michael G. Reed, and David M. Goldschlag  

E-print Network

Onion Routing Access Con gurations Paul F. Syverson, Michael G. Reed, and David M. Goldschlag Naval Research Laboratory Abstract Onion Routing is an infrastructure for private com- munication over and tra c analysis. Thus it hides not only the data being sent, but who is talking to whom. Onion Routing

232

Commentary Pro\\/con ethics debate: is nonheart-beating organ donation ethically acceptable?  

Microsoft Academic Search

This pro\\/con debate explores the ethical issues surrounding nonheart-beating organ donation (NHBD), a source of considerable controversy. It is estimated that NHBD can increase the number of organs available for transplant by 25% at a time of great need. However, should NHBD be ethically acceptable? In support of NHBD, it may be acceptable practice if there is a separation of

Leslie Whetstine; Kerry Bowman; Laura Hawryluck

233

SISTEMA REMOTO DE ADQUISICIÓN PARA EL CONTROL DEL RUIDO AMBIENTAL CON FPGA Y FPAA  

Microsoft Academic Search

RESUMEN Este artículo propone el diseño de un sistema de adquisición de datos con componentes digitales y analógicos microelectrónicos reconfigurables, como son el FPGA (Field Programmable Gate Array) y el FPAA (Field Programmable Analog Array), para monitorear y analizar la contaminación por ruido ambiental. Este prototipo obtiene los datos del ruido de una zona vial (zona centro de una ciudad)

A. Castillo Atoche; J. Vázquez Castillo; V. Sanchez Huerta; P. Del Río Dawn

234

HumanWildlife Conflicts 3(1):7287, Spring 2009 Historical review of elkagriculture con-  

E-print Network

Human­Wildlife Conflicts 3(1):72­87, Spring 2009 Historical review of elk­agriculture con- flicts considerable research has focused both on documenting the direct costs of wildlife impacts on agriculture and developing economic incentives for wildlife conservation (e.g., Western et al. 1994, Nyhus et al. 2003

235

DISEÑO E IMPLEMENTACIÓN ÓPTIMA DE PERIFÉRICOS DE DSP CON SYSTEM GENERATOR PARA MICROBLAZE  

Microsoft Academic Search

Con este trabajo pretendemos analizar como se lleva a cabo el diseño de periféricos de DSP utilizando uno de los nuevos entornos de diseño de alto nivel: System Generator for DSP. Así, en este documento el objetivo es mostrar por un lado las características del entorno de diseño y las herramientas utilizadas y por otro la metodología de diseño e

J. Viejo; E. Ostua; M. J. Bellido; J. Juan; A. Millan; P. Ruiz-de-Clavijo; D. Guerrero

236

ConTrack: Finding the most likely pathways between brain regions using diffusion tractography  

E-print Network

ConTrack: Finding the most likely pathways between brain regions using diffusion tractography for measuring white matter pathways in the living human brain. DFT is often used to discover new pathways the most likely pathways between brain regions using diffusion tractography. Journal of Vision, 8(9):15, 1

Wandell, Brian A.

237

Con il patrocinio di / Sponsored by IRCCS, Santa Lucia Foundation, Roma  

E-print Network

Con il patrocinio di / Sponsored by IRCCS, Santa Lucia Foundation, Roma Sapienza University of Rome; ilaria.bufalari@gmail.com For the day of March 13th: lucia.sacheli@uniroma1.it; matteo.candidi@gmail.com #12;Monday, 11th of March Sala Congressi - Santa Lucia Foundation, IRCCS entrance via Ardeatina, 354

Di Pillo, Gianni

238

La profesora de la Universidad de Alicante Estefana Lpez, galardonada con el Premio "Estudios Financieros"  

E-print Network

Financieros" Alicante, 4 de septiembre de 2013 La profesora Estefanía López Llopis, del Departamento de "Estudios Financieros 2013 por su artículo de investigación "Las operaciones de reducción de capital con Estudios Financieros y se ha consolidado como uno de los más prestigiosos en materia de fiscalidad en

Escolano, Francisco

239

Optimizacion Continua mediante la Evolucion de Funciones de Densidad de Probabilidad con  

E-print Network

Optimizaci´on Continua mediante la Evoluci´on de Funciones de Densidad de Probabilidad con un basa en la evoluci´on de funciones de densidad de pro- babilidad, que se centran en las zonas del muestreo de individuos a partir de una densidad de probabi- lidad. En la l´inea de este algoritmo

Casillas Barranquero, Jorge

240

Optimizacion Continua mediante la Evolucion de Funciones de Densidad de Probabilidad con  

E-print Network

Optimizaci´on Continua mediante la Evoluci´on de Funciones de Densidad de Probabilidad con un basa en la evoluci´on de funciones de densidad de probabilidad, que se centran en las zonas del espa muestreo de individuos a partir de una densidad de probabilidad. En la l´inea de este algoritmo, encon

Granada, Universidad de

241

Soil protozoa as bioindicators: pros and cons, methods, diversity, representative examples  

Microsoft Academic Search

This paper emphasizes some general aspects of soil protozoa as indicators of environmental quality—pros and cons, methods, and diversity. Protozoa are at the base of the heterotrophic eukaryotic food web and an essential component in marine, freshwater, and soil ecosystems because they consume a significant portion (usually >50%) of the bacterial productivity, enhancing nutrient cycles and energy flows to the

W. Foissner

1999-01-01

242

Stability of a viscoelastic thread immersed in a con ned region # A.Y. Gunawan  

E-print Network

Stability of a viscoelastic thread immersed in a con#12;ned region # A.Y. Gunawan Departemen an in#12;nitely long viscoelastic thread in a tube #12;lled with a Newtonian uid. We apply Je#11;reys the thread is, the more time it takes to break up. A viscoelastic thread breaks up faster than a Newtonian

Eindhoven, Technische Universiteit

243

Con dence regions for spectral peak frequencies , M. Lauk1;2  

E-print Network

Con dence regions for spectral peak frequencies J. Timmer1 , M. Lauk1;2 and C.H. Lucking2 1 Zentrum al., 1987; Beuter and De Geof- froy, 1996; Pinna, Maestri, Di Cesare, 1996; Khutorskaya and Fjodorova to tremor data is given in Section 5. 2 Spectral estimation The spectrum S(!)!2(? ; ) of a stationary

Timmer, Jens

244

Ai partecipanti verr rilasciato un attestato di partecipazione Partecipazione libera con pre-iscrizione obbligatoria online  

E-print Network

-iscrizione obbligatoria online sul sito: http://social-media-marketing-day.web-marketing-manager.it/nuove- figure) Università degli Studi di Milano Social Media Marketing Day Social media e digital: Nuove figure comununicazione d'impresa - Le 30 discipline del Web e Digital Market Manager Incontro con Andrea Albanese Docente

De Cindio, Fiorella

245

Enrichment of Glycoproteins using Nano-scale Chelating Con A Monolithic Capillary Chromatography  

PubMed Central

Immobilized lectin chromatography can be employed for glycoprotein enrichment, but commonly used columns have limitations of yield and resolution. In order to improve efficiency and to make the technique applicable to minimal sample material, we have developed a nano-scale chelating Concanavalin A (Con A) monolithic capillary prepared using GMA-EDMA (glycidyl methacrylate–co-ethylene dimethacrylate) as polymeric support. Con A was immobilized on Cu(II)-charged iminodiacetic acid (IDA) regenerable sorbents by forming a IDA:Cu(II):Con A sandwich affinity structure that has high column capacity as well as stability. When compared with conventional Con A lectin chromatography, the monolithic capillary enabled the better reproducible detection of over double the number of unique N-glycoproteins in human urine samples. Utility for analysis of minimal biological samples was confirmed by the successful elucidation of glycoprotein profiles in mouse urine samples at the microliter scale. The improved efficiency of the nano-scale monolithic capillary will impact the analysis of glycoproteins in complex biological samples, especially where only limited material may be available. PMID:19366252

Feng, Shun; Yang, Na; Pennathur, Subramaniam; Goodison, Steve; Lubman, David M.

2009-01-01

246

Beneficios del ejercicio físico en los pacientes con diabetes Benefits of exercise in patients with diabetes  

Microsoft Academic Search

Physical exercise has important health benefi ts. Physical inactivity is as- sociated with an increased risk of chronic diseases like type 2 diabetes mellitus. In contrast, moderate levels of physical exercise produce con- siderable benefi ts in diabetic patients, especially in those with type 2 dia- betes mellitus. At the onset of the disease, modifi cation of lifestyle, with improvements

Á. Caballero Figueroa; M. Hernández García

247

Mandated Mental Health Insurance: A Complex Case of Pros and Cons. Human Resources Series.  

ERIC Educational Resources Information Center

The pros and cons of state laws mandating mental health insurance are discussed in this report. The history of a 1985 Supreme Court case which held that states could mandate mental health benefits introduces the report. In an overview of the issue, the long-standing argument between the insurance industry and the mental health establishment is…

Paterson, Andrea

1986-01-01

248

phosphorylation at these sites, disrupted effects of glucose on CRTC2 activity in hepatocytes, con-  

E-print Network

regulators may improve glucose homeostasis and reduce long-term complications associated with this diseasephosphorylation at these sites, disrupted effects of glucose on CRTC2 activity in hepatocytes, con- firming the importance of these sites for transcrip- tional regulation in response to glucose (Fig. 3D). O

Nizet, Victor

249

Arctic & Antarctic Regions : referencias de artculos de revistas (algunos a texto completo), con  

E-print Network

· Arctic & Antarctic Regions : referencias de artículos de revistas (algunos a texto completo), con 1800 · REDALYC : hemeroteca en línea de los avances científicos en Iberoamérica. · Arctic & Antarctic

Autonoma de Madrid, Universidad

250

Accesibilidad para personas con debilidad visual Mac OS X Snow Leopard  

E-print Network

Accesibilidad para personas con debilidad visual Mac OS X Snow Leopard ASIC ­ 18 de noviembre de LEOPARD Al igual que otros sistemas operativos, MAC OS X Snow Leopard ofrece algunas ayudas para que las debilidad visual Mac OS X Snow Leopard ASIC ­ 18 de noviembre de 2010 Pág. 2 de 25 1. Recomendaciones

Fernández de Córdoba, Pedro

251

I JORNADAS SOBRE TRASTORNO DE DFICIT DE ATENCIN CON/SIN HIPERACTIVIDAD. CONOCIENDO EL  

E-print Network

I JORNADAS SOBRE TRASTORNO DE D�FICIT DE ATENCI�N CON/SIN HIPERACTIVIDAD. CONOCIENDO EL TDAH PARA alumnos que presentan TDAH tienen capacidad para adquirir nuevos conocimientos, pero su dificultad radica. "Conociendo el TDAH": Origen, signos de alerta, diagnóstico, evaluación, tratamiento. Ponente: Dra. Mara

Rey Juan Carlos, Universidad

252

which settles the debate about the exclusiveness of memory con-solidation during sleep.  

E-print Network

which settles the debate about the exclusiveness of memory con- solidation during sleep. In describing the findings regarding procedural memory and sleep in humans, Walker states that the evidence & Born 1999a]) as well as different manipulation techniques (e.g., early versus late sleep [Plihal & Born

253

GENERACION DE REGLAS DIFUSAS CON BUEN NIVEL DE COOPERACION MEDIANTE ALGORITMOS DE HORMIGAS  

E-print Network

´etodos suelen estar basados en algoritmos de aprendizaje muy costosos en tiempo, tales como los Algoritmos Gen´eticosGENERACI´ON DE REGLAS DIFUSAS CON BUEN NIVEL DE COOPERACI´ON MEDIANTE ALGORITMOS DE HORMIGAS Jorge un nuevo pa- radigma de algoritmos bioinspirados, los al- goritmos de Optimizaci´on mediante Colonias

Casillas Barranquero, Jorge

254

TITLE: Shifting Agrarian Landscapes: Climate Change and Adaptation in Bangladesh HOSTS: Jason Cons and Shelley Feldman  

E-print Network

TITLE: Shifting Agrarian Landscapes: Climate Change and Adaptation in Bangladesh HOSTS: Jason Cons by exploring the micro-processes of adaptation and survival in four villages in Bangladesh. Specifically them to their daily lives and production practices? Second, what strategies of adaptation are rural

Angenent, Lars T.

255

Adsornftl 8~f^Ll* ORNL/CON-155 O173IS1o COp  

E-print Network

of Stirling Engine Thermodynamics N. C. J. Chen F. P. Griffin C. D. West OPERATED BY TAHP *MARTIN MARIETTA Government or any agency thereof. #12;ORNL/CON-155 LINEAR HARMONIC ANALYSIS OF STIRLING ENGINE THERMODYNAMICS ................... 8 2.3 Integrated Energy Equations ......................... 11 2.4 Engine Performance Parameters

Oak Ridge National Laboratory

256

Integrated Concentration in Science, 2012 High Fructose Corn Syrup a mini iCons case study  

E-print Network

© Integrated Concentration in Science, 2012 High Fructose Corn Syrup­ a mini iCons case study researchers find that high fructose corn syrup prompts considerably more weight gain. http://www.princeton.edu/main/news/archive/S26/91/22K07/ The Atlantic, Aug 13, 2012 ­ Study: High fructose corn syrup no worse than `real' sugar

Auerbach, Scott M.

257

ANÁLISIS PRELIMINAR DE COMPUESTOS FENÓLICOS Y CAPSAICINOIDES EN VARIEDADES DE CHILE CON DIFERENTE CAPACIDAD PUNGENTE  

Microsoft Academic Search

El chile jalapeño provoca un alto nivel de irritación a diferentes niveles del tracto estomacal en comparación con el chile habanero. A pesar de que el chile habanero presenta una mayor capacidad pungente, no es irritante. A la fecha se desconoce la naturaleza de los compuestos responsables de este efecto. En el presente trabajo se reporta el análisis preliminar de

Salvador Horacio; Guzmán Maldonado; Irineo Torres Pacheco; Mario González Chavira; María Alejandra; Mora Avilés; Guadalupe Herrera Hernández; David Hernández López

258

The environmental impact of supplying power to the Con Edison service territory: 1975--1990  

Microsoft Academic Search

A description is given of present and anticipated environmental consequences of meeting electricity demand in the Con Edison service territory--New York City and most of Westchester County. Important issues include nuclear power, air pollution, water and aquatic life, and siting power plants and transmission facilities. (GRA)

A. K. Freedman; J. C. Cohen

1975-01-01

259

22 Wisconsin Natural Resources These are all good ways to con-  

E-print Network

water purification and replenish- ing the water table. To supply our drinking water, we withdraw22 Wisconsin Natural Resources These are all good ways to con- serve water but are only part of your water conservation opportu- nity. These practices focus on water demand as it relates to drawing

Saldin, Dilano

260

Manual de uso de la Pasarela conCIENCIA > Digital.CSIC (versin 2.2)  

E-print Network

datos de producción científica institucional y gestionar los trasvases al repositorio de un modo producción de su centro o instituto cargada en conCIENCIA que desee trasvasar al repositorio institucional accesible solamente a la comunidad bibliotecaria del CSIC y los administradores del repositorio que sirve

261

Aplicación de técnicas de usabilidad con inclusión en la Fase de Análisis de Requisitos  

Microsoft Academic Search

En este artículo se presenta un caso práctico de utilización de técnicas de usabilidad con inclusión en la Fase de Análisis de requisitos en el ciclo de desarrollo Web siguiendo una metodología de Diseño Centrado en el Usuario. Como caso práctico, se va a mostrar la aplicación de técnicas cómo Perfiles de Usuario, Persona, Escenarios y Card Sorting como soporte

Lourdes Moreno; Paloma Martinez; Belen Ruiz

262

Procedimiento de Sauvè-Kapandji modificado para desórdenes postraumáticos y degenerativos de la articulación radioulnar distal  

Microsoft Academic Search

This is an observational prospective study type series of cases that shows the experience of the group of surgery of hand of the Central Military Hospital between January of 1998 and Julio the 2003. 65 patients were included like surgery of salvage of the articulation radio- ulnar distal in different traumatic and degenerative pathologies; comparing the results with those published

Néstor Julián; Fabio Suárez Romero; Sergio Bocanegra Navia; Residente Ortopedia

263

COMPÓSITOS DE BENTONITA E POLIETILENO RECICLADO MODIFICADO - PROPRIEDADES FÍSICO-QUÍMICAS  

Microsoft Academic Search

Um segmento da nanotecnologia que vem se expandindo é a agregação de polímeros no espaço interlamelar de alguns tipos de argilas com finalidades diversas. Esses nanocompósitos polímero\\/silicatos, em camadas, são similares aos compósitos poliméricos normais utilizados na obtenção de propriedades não disponíveis nos polímeros não carregados. Nesse sentido, esse trabalho teve como objetivo desenvolver compósitos poliméricos, a partir de PEBD

L. M. F. Cunha; C. T. Alves; T. M. Garschagen; H. F. Machado Junior; D. A. Costa

264

GENETICALLY MODIFIED FOOD CROPS AND PUBLIC HEALTH Cultivos alimenticios genéticamente modificados y salud pública  

Microsoft Academic Search

The progress made in plant biotechnology has provided an opportunity to new food crops being developed having desirable traits for improving crop yield, reducing the use of agrochemicals and adding nutritional properties to staple crops. However, genetically modified (GM) crops have become a subject of intense debate in which opponents argue that GM crops represent a threat to individual freedom,

ORLANDO ACOSTA

265

Optimizing Electrospray Interfaces Using Slowly Diverging Conical Duct (ConDuct) Electrodes.  

PubMed

We demonstrate that the efficiency of ion transmission from atmosphere to vacuum through stainless steel electrodes that contain slowly divergent conical duct (ConDuct) channels can be close to 100%. Here, we explore the properties of 2.5-cm-long electrodes with angles of divergence of 0°, 1°, 2°, 3°, 5°, 8°, 13°, and 21°, respectively. The ion transmission efficiency was observed to jump from 10-20% for the 0° (straight) channels to 90-95% for channels with an angle of divergence as small as 1°. Furthermore, the 2-3° ConDuct electrodes produced extraordinarily low divergence ion beams that propagated in a laser-like fashion over long distances in vacuum. To take advantage of these newly discovered properties, we constructed a novel atmosphere-to-vacuum ion interface utilizing a 2° ConDuct as an inlet electrode and compared its ion transmission efficiency with that of the interface used in the commercial (Thermo Fisher Scientific, San Jose, CA, USA) Velos Orbitrap and Q Exactive mass spectrometers. We observed that the ConDuct interface transmitted up to 17 times more ions than the commercial reference interface and also yielded improved signal-to-noise mass spectra of peptides. We infer from these results that the performance of many current atmosphere-to-vacuum interfaces utilizing metal capillaries can be substantially improved by replacing them with 1° or 2° metal ConDuct electrodes, which should preserve the convenience of supplying ion desolvation energy by heating the electrode while greatly increasing the efficiency of ion transmission into the mass spectrometer. PMID:25667060

Krutchinsky, Andrew N; Padovan, Júlio C; Cohen, Herbert; Chait, Brian T

2015-04-01

266

Optimizing Electrospray Interfaces Using Slowly Diverging Conical Duct (ConDuct) Electrodes  

NASA Astrophysics Data System (ADS)

We demonstrate that the efficiency of ion transmission from atmosphere to vacuum through stainless steel electrodes that contain slowly divergent conical duct (ConDuct) channels can be close to 100%. Here, we explore the properties of 2.5-cm-long electrodes with angles of divergence of 0°, 1°, 2°, 3°, 5°, 8°, 13°, and 21°, respectively. The ion transmission efficiency was observed to jump from 10-20% for the 0° (straight) channels to 90-95% for channels with an angle of divergence as small as 1°. Furthermore, the 2-3° ConDuct electrodes produced extraordinarily low divergence ion beams that propagated in a laser-like fashion over long distances in vacuum. To take advantage of these newly discovered properties, we constructed a novel atmosphere-to-vacuum ion interface utilizing a 2° ConDuct as an inlet electrode and compared its ion transmission efficiency with that of the interface used in the commercial (Thermo Fisher Scientific, San Jose, CA, USA) Velos Orbitrap and Q Exactive mass spectrometers. We observed that the ConDuct interface transmitted up to 17 times more ions than the commercial reference interface and also yielded improved signal-to-noise mass spectra of peptides. We infer from these results that the performance of many current atmosphere-to-vacuum interfaces utilizing metal capillaries can be substantially improved by replacing them with 1° or 2° metal ConDuct electrodes, which should preserve the convenience of supplying ion desolvation energy by heating the electrode while greatly increasing the efficiency of ion transmission into the mass spectrometer.

Krutchinsky, Andrew N.; Padovan, Júlio C.; Cohen, Herbert; Chait, Brian T.

2015-02-01

267

Optimizing Electrospray Interfaces Using Slowly Diverging Conical Duct (ConDuct) Electrodes  

NASA Astrophysics Data System (ADS)

We demonstrate that the efficiency of ion transmission from atmosphere to vacuum through stainless steel electrodes that contain slowly divergent conical duct (ConDuct) channels can be close to 100%. Here, we explore the properties of 2.5-cm-long electrodes with angles of divergence of 0°, 1°, 2°, 3°, 5°, 8°, 13°, and 21°, respectively. The ion transmission efficiency was observed to jump from 10-20% for the 0° (straight) channels to 90-95% for channels with an angle of divergence as small as 1°. Furthermore, the 2-3° ConDuct electrodes produced extraordinarily low divergence ion beams that propagated in a laser-like fashion over long distances in vacuum. To take advantage of these newly discovered properties, we constructed a novel atmosphere-to-vacuum ion interface utilizing a 2° ConDuct as an inlet electrode and compared its ion transmission efficiency with that of the interface used in the commercial (Thermo Fisher Scientific, San Jose, CA, USA) Velos Orbitrap and Q Exactive mass spectrometers. We observed that the ConDuct interface transmitted up to 17 times more ions than the commercial reference interface and also yielded improved signal-to-noise mass spectra of peptides. We infer from these results that the performance of many current atmosphere-to-vacuum interfaces utilizing metal capillaries can be substantially improved by replacing them with 1° or 2° metal ConDuct electrodes, which should preserve the convenience of supplying ion desolvation energy by heating the electrode while greatly increasing the efficiency of ion transmission into the mass spectrometer.

Krutchinsky, Andrew N.; Padovan, Júlio C.; Cohen, Herbert; Chait, Brian T.

2015-04-01

268

SweConsNet'02 The 1st SweConsNet Workshop Pierre Flener and Justin Pearson, ASTRA, Uppsala Univ. Page 1 of 19 Relational Modelling of CSPs  

E-print Network

SweConsNet'02 ­ The 1st SweConsNet Workshop Pierre Flener and Justin Pearson, ASTRA, Uppsala Univ Flener and Justin Pearson, ASTRA, Uppsala Univ. Page 2 of 19 Members · Dr Pierre Flener, Department of Information Technology, principal investigator · Dr Justin Pearson, Department of Information Technology · Mr

Flener, Pierre

269

Appeared in ASPLOS-VI Proceedings, Oct 1994 1 Dynamic Memory Disambiguation Using the Memory Con ict Bu er  

E-print Network

Appeared in ASPLOS-VI Proceedings, Oct 1994 1 Dynamic Memory Disambiguation Using the Memory Con store load depen- dences. Correct program execution is ensured by the memory con ict bu er and repair scheduling model can be achieved for both non-numerical and numerical programs. 1 Introduction A compile

Hwu, Wen-mei W.

270

A brief guide to access the Wound Healing and Management (WHAM) Node via JBI COnNECT+  

E-print Network

A brief guide to access the Wound Healing and Management (WHAM) Node via JBI COnNECT+ To access JBI COnNECT+ and the Wound Healing and Management Node go to JBI Homepage at http and password are both the same word: - wound. #12; To go directly to the Wound Healing and Management Node

271

HOUSing Study / By Urs Buehlmann. Matt Bumgardner and Kar en Koenig rends in housing and other con  

E-print Network

in housing and other con struction-related sectors continue to have a significant impact on the wood products year. Con ducted in early 2014, the study is a joint effort by Virginia Tech, the U.S. Forest Service and Wood Products. (See more information about the survey, page 64.) Housing Market Analysis Overall

272

Apoyo financiero La Universidad de los Andes cuenta con un plan de asistencia financiera que les permite a los  

E-print Network

Apoyo financiero La Universidad de los Andes cuenta con un plan de asistencia financiera que les, Los Andes cuenta con una unidad (Oficina de Apoyo Financiero) que brinda información, asesoría, apoyo la Universidad. Ir al sitio web de Apoyo Financiero 1 / 2 #12;Apoyo financiero {ifactum2menu id=509

Amézquita, Adolfo

273

FORMALISM ALE ALEP CL-ONE ConTroll CUF TDL ProFIT TFS Type system  

E-print Network

(2) FORMALISM ALE ALEP CL-ONE ConTroll CUF TDL ProFIT TFS Type system multiple inheritance yes;(3) COMPUTATION ALE ALEP CL-ONE ConTroll CUF TDL ProFIT TFS Algorithmic issues parsing PS-based PS-based PS

Branco, António Horta

274

Añadir quimioterapia después de la radioterapia mejora la supervivencia de adultos con un tipo de tumor cerebral de crecimiento lento  

Cancer.gov

Adultos con gliomas de grado bajo, una forma de tumor cerebral, que recibieron tratamiento con quimioterapia después de la radioterapia vivieron más tiempo que pacientes que recibieron solo radioterapia, según los resultados de seguimiento a largo plazo de un estudio clínico aleatorizado y controlado, subvencionado por los NIH.

275

JULY–SEPTEMBER 2013 VIRGINIA LIBRARIES PAGE 21 We Put On a Comic-Con (And So Can You!)  

E-print Network

for fans of comic books, graphic novels, manga, anime, and science fiction to gather and enjoy, discuss, learn about, and participate in the dissemination of information about their interests. (“Con ” is a shortened form of fan convention.) ow many of you have been in meetings when an idea was proposed that garnered nearly universal support? It may not happen often, but that was the response when we proposed that Chesterfield County Public Library (CCPL) have a comic-con of its very own. A comic-con may seem like a strange fit for a library. People may think of comic books as an inferior form of literature, or not as literature at all, and they may think of a comic-con as a commercial enterprise (which it can be, but often isn’t). The most famous comic-con, popularly known as the Comic-Con, is the International Comic-Con: San Diego. Started in 1970, it has since grown to draw upwards of 13,000 people, and features superstar creators and authors of the comic, sci-fi, and fantasy world. 1 H At Chesterfield County Public Library, we felt that a comic-con would align well with our mission of transforming information into knowledge, and would help us achieve some powerful goals. We wanted to share the importance and impact of graphic novels and comic books on literacy and the validity of their inclusion in a public library materials collection. After attending a presentation at Virginia Library Association

Kate Denwiddie; Kareemah Hamdan

276

Probing of Brain States in Real-Time: Introducing the ConSole Environment  

PubMed Central

Recent years have seen huge advancements in the methods available and used in neuroscience employing EEG or MEG. However, the standard approach is to average a large number of trials for experimentally defined conditions in order to reduce intertrial-variability, i.e., treating it as a source of “noise.” Yet it is now more and more accepted that trial-to-trial fluctuations bear functional significance, reflecting fluctuations of “brain states” that predispose perception and action. Such effects are often revealed in a pre-stimulus period, when comparing response variability to an invariant stimulus. However such offline analyses are disadvantageous as they are correlational by drawing conclusions in a post hoc-manner and stimulus presentation is random with respect to the feature of interest. A more direct test is to trigger stimulus presentation when the relevant feature is present. The current paper introduces Constance System for Online EEG (ConSole), a software package capable of analyzing ongoing EEG/MEG in real-time and presenting auditory and visual stimuli via internal routines. Stimulation via external devices (e.g., transcranial magnetic stimulation) or third-party software (e.g., PsyScope X) is possible by sending TTL-triggers. With ConSole it is thus possible to target the stimulation at specific brain states. In contrast to many available applications, ConSole is open-source. Its modular design enhances the power of the software as it can be easily adapted to new challenges and writing new experiments is an easy task. ConSole is already pre-equipped with modules performing standard signal processing steps. The software is also independent from the EEG/MEG system, as long as a driver can be written (currently two EEG systems are supported). Besides a general introduction, we present benchmark data regarding performance and validity of the calculations used, as well as three example applications of ConSole in different settings. ConSole can be downloaded at: http://console-kn.sf.net. PMID:21716603

Hartmann, Thomas; Schulz, Hannah; Weisz, Nathan

2011-01-01

277

Order effect y presencia de erratas en estudios de usuarios con eye tracking  

E-print Network

evitarse en el diseño de experimentos que impliquen lectura, especialmente si se aplican métricas de eye. Estudios de usuarios. Test de usuarios. Tareas. Diseño de experimentos. Sesgos 1. INTRODUCCI�N Los estudios, su cultura, etc.), y otros están relacionados con el propio diseño del experimento (la redacción de

278

Administracin Nacional de Aeronutica y del Espacio Descubra la relacin que tiene el espacio con usted  

E-print Network

los océanos Remedios contra la contaminación ambiental Control de corrosión en represas y puentes sistema de tratamiento de aguas negras, el cual protege el medio ambiente. ¿Y quién no querría puentes y corrosión en puentes, represas y otras estructuras. Si usted pasa tiempo en la playa, allí está la NASA con

279

The International Consortium for the Investigation of Renal Malignancies (I-ConFIRM)  

Cancer.gov

I-ConFIRM (The International Consortium for the Investigation of Renal Malignancies) was formed in 2013 to promote international, multidisciplinary collaborations to advance our understanding of the etiology and outcomes of kidney cancer. The Consortium is comprised of international investigators and clinicians who have ongoing or completed studies relating to kidney cancer. In its initial phase, the Consortium will undertake research projects that pool existing data across studies as well as developing other collaborative research projects.

280

ConSurf 2005: the projection of evolutionary conservation scores of residues on protein structures  

Microsoft Academic Search

Key amino acid positions that are important for main- taining the 3D structure of a protein and\\/or its func- tion(s), e.g. catalytic activity, binding to ligand, DNA or other proteins, are often under strong evolutionary constraints. Thus, the biological importance of a residue often correlates with its level of evolution- ary conservation within the protein family. ConSurf (http:\\/\\/consurf.tau.ac.il\\/) is a

Meytal Landau; Itay Mayrose; Yossi Rosenberg; Fabian Glaser; Eric Martz; Tal Pupko; Nir Ben-tal

2005-01-01

281

Pro\\/con ethics debate: is nonheart-beating organ donation ethically acceptable?  

Microsoft Academic Search

This pro\\/con debate explores the ethical issues surrounding nonheart-beating organ donation (NHBD), a source of considerable\\u000a controversy. It is estimated that NHBD can increase the number of organs available for transplant by 25% at a time of great\\u000a need. However, should NHBD be ethically acceptable? In support of NHBD, it may be acceptable practice if there is a separation\\u000a of

Leslie Whetstine; Kerry Bowman; Laura Hawryluck

2002-01-01

282

tas. Siempre con el apoyo de Minitab y poniendo el nfasis en la claridad de la  

E-print Network

desean revitali- zarlo. Lean Six Sigma es una metodología de me- jora cuyo objetivo es hacer que las Mejora Lean Six Sigma Nivel Black Belt está estructu- rado para proporcionar a sus participantes las implantación con éxito de programas Lean Six Sigma. · Metodología: en el que se detallan las ac- tividades

Politècnica de Catalunya, Universitat

283

The ConSurf-HSSP database: The mapping of evolutionary conservation among homologs onto PDB structures  

Microsoft Academic Search

The HSSP (Homology-Derived Sec- ondary Structure of Proteins) database provides multiple sequence alignments (MSAs) for proteins of known three-dimensional (3D) structure in the Protein Data Bank (PDB). The database also con- tains an estimate of the degree of evolutionary conservation at each amino acid position. This esti- mate, which is based on the relative entropy, corre- lates with the functional

Fabian Glaser; Yossi Rosenberg; Amit Kessel; Tal Pupko; Nir Ben-Tal

2005-01-01

284

Disfrute del sol con cuidado -- Cualquier persona puede padecer cáncer de piel  

Cancer.gov

Está bien pasar algún tiempo al aire libre, pero usted debe saber que las personas de piel más oscura –incluso muchos hispanos o latinos– tienen riesgo de padecer cáncer de piel. Siempre que pueda, evite exponerse al sol, especialmente entre las 10 a.m. y las 4 p.m., cuando los rayos del sol son más fuertes. Si trabaja o juega al aire libre, cúbrase y protéjase la piel con prendas de vestir, sombreros, lentes, filtros solares.

285

Valutazione delle aree delaminate in strutture edili fibrorinforzate, con il metodo termico  

Microsoft Academic Search

SOMMARIO La recente normativa internazionale ed italiana relativa al consolidamento statico di opere civili con materiali compositi fibrorinfozati fornisce dati quantitativi precisi sul numero ed estensione massima ammissibile delle aree distaccate. Purtroppo, la tipologia delle prove previste contempla quelle non distrutive solo in modo complementare, finalizzate essenzialmente alla verifica dell'uniformità dell'applicazione. L'assenza di un'affidabile procedura di controllo in grado di

E. Grinzato; R. Trentin; P. G. Bison; S. Marinetti; M. R. Valluzzi

286

Demystifying 3D ICs: The Pros and Cons of Going Vertical  

Microsoft Academic Search

This article provides a practical introduction to the design trade-offs of the currently available 3D IC technology options. It begins with an overview of techniques, such as wire bonding, microbumps, through vias, and contactless interconnection, comparing them in terms of vertical density and practical limits to their use. We then present a high-level discussion of the pros and cons of

W. Rhett Davis; John Wilson; Stephen Mick; Jian Xu; Hao Hua; Christopher Mineo; Ambarish M. Sule; Michael Steer; Paul D. Franzon

2005-01-01

287

The pros and cons of endovascular and open surgical treatments for patients with acute limb ischemia.  

PubMed

The present review addresses the pros and cons of the current, wide variety of therapeutic options available for the treatment of acute limb ischemia (ALI). Despite five prospective randomized controlled trials comparing catheter directed thrombolysis and open surgical revascularization, no single treatment strategy can yet be considered optimal for patients with ALI. This report includes 20 years of published data to evaluate the efficacy and safety profile of thrombolytic agents and adjunctive endovascular techniques when compared to open surgical revascularization. PMID:25573443

Branco, B C; Montero-Baker, M F; Mills, J L

2015-06-01

288

Structure, stratigraphy and petroleum geology of the south east Nam Con Son Basin, offshore Vietnam  

SciTech Connect

Recent exploration of the south east Nam Con Son Basin, offshore Vietnam, by BP in alliance with Statoil has involved acquisition of new seismic and well data. These new data have allowed re-evaluation of the tectono-stratigraphic development and petroleum geology, and have provided additional constraints on the regional tectonic evolution. The offshore Vietnamese basins have evolved in response to the complex relative motions of Indochina, Peninsular Malaysia, Borneo and the South China Sea during the Cenozoic. On the regional scale these motions have been accommodated by strike-slip fault development, rifting and contraction. In the Nam Con Son Basin these motions have interacted in different ways from the Palaeogene to recent. Two rifting episodes are recognized; a Palaeogene phase dominated by E-W trending extensional faults, and a Miocene phase dominated by N-S to NE-SW trending faults. The structural evolution is complicated by a pulse of mild contraction during the Middle Miocene. The sedimentary fill of the basin evolves from continental fluvio-lacustrine in the Palaeogene through to fully marine following the second phase of rifting in the Miocene. This pulsed structural and stratigraphic evolution has resulted in basinwide deposition of source, reservoir and seal facies, and produced a variety of potential trapping styles. This paper describes the hydrocarbon habitat of the south east Nam Con Son Basin within the context of the regional tectono-stratigraphic model.

Fraser, A.J.; Matthews, S.J.; Lowe, S.; Todd, S.P.; Simon, P. Peel, F.J. [BP Exploration Operating Co., Ltd., Uxbridge (United Kingdom)

1996-12-31

289

Structure, stratigraphy and petroleum geology of the south east Nam Con Son Basin, offshore Vietnam  

SciTech Connect

Recent exploration of the south east Nam Con Son Basin, offshore Vietnam, by BP in alliance with Statoil has involved acquisition of new seismic and well data. These new data have allowed re-evaluation of the tectono-stratigraphic development and petroleum geology, and have provided additional constraints on the regional tectonic evolution. The offshore Vietnamese basins have evolved in response to the complex relative motions of Indochina, Peninsular Malaysia, Borneo and the South China Sea during the Cenozoic. On the regional scale these motions have been accommodated by strike-slip fault development, rifting and contraction. In the Nam Con Son Basin these motions have interacted in different ways from the Palaeogene to recent. Two rifting episodes are recognized; a Palaeogene phase dominated by E-W trending extensional faults, and a Miocene phase dominated by N-S to NE-SW trending faults. The structural evolution is complicated by a pulse of mild contraction during the Middle Miocene. The sedimentary fill of the basin evolves from continental fluvio-lacustrine in the Palaeogene through to fully marine following the second phase of rifting in the Miocene. This pulsed structural and stratigraphic evolution has resulted in basinwide deposition of source, reservoir and seal facies, and produced a variety of potential trapping styles. This paper describes the hydrocarbon habitat of the south east Nam Con Son Basin within the context of the regional tectono-stratigraphic model.

Fraser, A.J.; Matthews, S.J.; Lowe, S.; Todd, S.P.; Simon, P. Peel, F.J. (BP Exploration Operating Co., Ltd., Uxbridge (United Kingdom))

1996-01-01

290

ConPADE: Genome Assembly Ploidy Estimation from Next-Generation Sequencing Data  

PubMed Central

As a result of improvements in genome assembly algorithms and the ever decreasing costs of high-throughput sequencing technologies, new high quality draft genome sequences are published at a striking pace. With well-established methodologies, larger and more complex genomes are being tackled, including polyploid plant genomes. Given the similarity between multiple copies of a basic genome in polyploid individuals, assembly of such data usually results in collapsed contigs that represent a variable number of homoeologous genomic regions. Unfortunately, such collapse is often not ideal, as keeping contigs separate can lead both to improved assembly and also insights about how haplotypes influence phenotype. Here, we describe a first step in avoiding inappropriate collapse during assembly. In particular, we describe ConPADE (Contig Ploidy and Allele Dosage Estimation), a probabilistic method that estimates the ploidy of any given contig/scaffold based on its allele proportions. In the process, we report findings regarding errors in sequencing. The method can be used for whole genome shotgun (WGS) sequencing data. We also show applicability of the method for variant calling and allele dosage estimation. Results for simulated and real datasets are discussed and provide evidence that ConPADE performs well as long as enough sequencing coverage is available, or the true contig ploidy is low. We show that ConPADE may also be used for related applications, such as the identification of duplicated genes in fragmented assemblies, although refinements are needed. PMID:25880203

Margarido, Gabriel R. A.; Heckerman, David

2015-01-01

291

Mound-ACT*DE*CON{sup SM} feasibility study. Phase 2: Final report  

SciTech Connect

A portion of the abandoned Miami-Erie Canal paralleling the Greater Miami River receives the runoff and storm-water discharge from Mound Laboratory. In 1969, a low-level plutonium leak contaminated sediment as far away as 1.5 mi from the Mound site along the old canal system. An estimated one million cubic feet of sediment requires remediation. The technology being evaluated for the remediation of the low-level plutonium-238 contamination of the sediment involves two processes: washing the sediments with ACT*DE*CON{sup SM} solution to dissolve the contaminant, followed by extraction of the solution and processing with the MAG*SEP{sup SM} process to concentrate the contaminant and allow reuse of the ACT*DE*CON{sup SM} solution. The processes are being optimized for pilot-scale and field demonstration. Phase 2 of the project primarily involved identification at the laboratory scale of the optimal ACT*DE*CON{sup SM} formulation, identification of the ion-exchanger and MAG*SEP{sup SM} particles, verification of the plutonium mobility in the treated soil, and evaluation of other process parameters according to a series of tasks.

NONE

1994-12-01

292

COMUNICATO STAMPA Protocollo di intesa tra Universit degli Studi di Salerno e ONG Medici con l'Africa CUAMM: domani la firma  

E-print Network

COMUNICATO STAMPA Protocollo di intesa tra Università degli Studi di Salerno e ONG Medici con l che domani, 25 luglio, sarà siglato tra l'Università degli Studi di Salerno e l'ONG Medici con l - "testimonia la ferma volontà dell'Università di Salerno di contribuire, unitamente alla ONG Medici con l

Costagliola, Gennaro

293

40 CFR 180.1213 - Coniothyrium minitans strain CON/M/91-08; exemption from the requirement of a tolerance.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 false Coniothyrium minitans strain CON/M/91-08; exemption from the...180.1213 Coniothyrium minitans strain CON/M/91-08; exemption from the...microbial pesticide Coniothyrium minitans strain CON/M/91-08 when used in or on...

2010-07-01

294

For Crop Years(s) Smith Crop Consulting  

E-print Network

Information Appendix 5: Phosphorus Index Appendix 6: Manure Management Appendix 7: Stormwater Control/Technical Manual January 2013 #12;246.6 CMU/Field ID Acres Crop Manure Group Application Season Application Application Season Application Management N P2O5 K2O N P2O5 K2O N P2O5 K2O Whole Farm Note: Notes (Select "Yes

Guiltinan, Mark

295

Environmental performance comparison of wet and thermal routes for phosphate fertilizer production using LCA – A Brazilian experience  

Microsoft Academic Search

Life cycle assessment (LCA) was applied to perform an environmental comparison between the phosphate fertilizers fused magnesium phosphate (FMP) and triple superphosphate (TSP). In order to perform the comparison a functional unit (FU) of 41.66kg P2O5, which corresponds to 208kg FMP (20% P2O5) and 93kg TSP (45% P2O5) was defined. Concerning the product systems a “cradle to gate” approach was

Gil Anderi da Silva; Luiz Alexandre Kulay

2005-01-01

296

32 Wesley C. Salmon -it has been appropriate to deny that such appeals to functions involve the con-  

E-print Network

32 Wesley C. Salmon -it has been appropriate to deny that such appeals to functions involve the con's (1962) defense of deductive explanation in her contribution to the third volume #12;34 Wesley C. Salmon

Fitelson, Branden

297

The Credibility Revolution in Empirical Economics: How Better Research Design is Taking the Con out of Econometrics  

E-print Network

Just over a quarter century ago, Edward Leamer (1983) reflected on the state of empirical work in economics. He urged empirical researchers to “take the con out of econometrics” and memorably observed (p. 37): “Hardly ...

Angrist, Joshua

2010-01-01

298

Timing and Tectonic implications of basin inversion in the Nam Con Son Basin and adjacent areas, southern South China Sea  

E-print Network

The Nam Con Son (NCS) Basin, located offshore of SE Vietnam, is one of several Tertiary rift basins that formed during initial Eocene(?)-Oligocene rifting. Following cessation of rifting at the end of Oligocene time, these basins were subjected...

Olson, Christopher Charles

2001-01-01

299

Extenso estudio realizado en muchos centros demuestra que hay una precisión comparable de la colonoscopia virtual con la colonoscopia convencional  

Cancer.gov

Según los resultados del Estudio Nacional de Colografía de Tomografía Computarizada de la American College of Radiology Imaging Network, ACRIN, la colografía de tomografía computarizada, también conocida como colonoscopia virtual, es comparable a la colonoscopia convencional en su capacidad para detectar con precisión cáncer y pólipos precancerosos y podría servir como examen selectivo inicial de detección de cáncer colorrectal. La colonoscopia convencional usa un tubo largo, flexible, con cámara, para ver el revestimiento del colon.

300

Presentación del estudio "Links" de hombres que tienes sexo con hombres en Buenos Aires, Argentina.  

PubMed

Estudios previos en Buenos Aires reportaron altas prevalencias de HIV entre HSH, con valores que oscilan entre 9 y 14% durante casi 10 años de continuo testeo. El objetivo principal de este estudio fue la evaluación de factores relacionados al comportamiento de alto riesgo para transmisión del HIV entre HSH entre los que se incluyen el conocimiento y factores emocionales, socioculturales y ambientales. Por otro lado se realizó la estimación de prevalencia e incidencia de HIV utilizando RDS (Respondent Driven Sampling), así como la presencia de otras infecciones de transmisión sexual. Por último se evaluaron los hábitos de testeo para HIV indagando que factores facilitan o impiden su realización. El estudio constó de dos fases, en primer lugar una fase cualitativa y posteriormente una fase cuantitativa con una duración total de 4 años y medio. Durante la fase cualitativa se realizaron 44 entrevistas individuales en profundidad, 8 grupos focales y 10 observaciones etnográficas (hoteles, baños públicos ("teteras"), cines pornográficos, fiestas privadas, dark rooms y discotecas). Durante la fase cuantitativa del estudio se realizó el reclutamiento de 500 participantes que provinieron de la Ciudad Autónoma de Buenos Aires, así como del Gran Buenos Aires. El reclutamiento se comenzó con 16 participantes llamados semillas. Se realizó el diagnóstico de infección por HIV, hepatitis B y C (HBV y HCV), Treponema pallidum, Virus Papiloma Humano (HPV) y Chlamidias. La colaboración establecida entre los grupos de trabajo enfocados en áreas diversas posibilitó el abordaje conjunto de nuevas estrategias de investigación antes no exploradas en nuestro país. Los resultados más relevantes de esta investigación serán progresivamente publicados en sucesivos números de Actualizaciones en SIDA. PMID:25264397

Carballo-Diéguez, Alex; Avila, María M; Balán, Iván C; Marone, Rubén; Pando, María A; Barreda, Victoria

2011-03-01

301

Presentación del estudio “Links” de hombres que tienes sexo con hombres en Buenos Aires, Argentina  

PubMed Central

Resumen Estudios previos en Buenos Aires reportaron altas prevalencias de HIV entre HSH, con valores que oscilan entre 9 y 14% durante casi 10 años de continuo testeo. El objetivo principal de este estudio fue la evaluación de factores relacionados al comportamiento de alto riesgo para transmisión del HIV entre HSH entre los que se incluyen el conocimiento y factores emocionales, socioculturales y ambientales. Por otro lado se realizó la estimación de prevalencia e incidencia de HIV utilizando RDS (Respondent Driven Sampling), así como la presencia de otras infecciones de transmisión sexual. Por último se evaluaron los hábitos de testeo para HIV indagando que factores facilitan o impiden su realización. El estudio constó de dos fases, en primer lugar una fase cualitativa y posteriormente una fase cuantitativa con una duración total de 4 años y medio. Durante la fase cualitativa se realizaron 44 entrevistas individuales en profundidad, 8 grupos focales y 10 observaciones etnográficas (hoteles, baños públicos (“teteras”), cines pornográficos, fiestas privadas, dark rooms y discotecas). Durante la fase cuantitativa del estudio se realizó el reclutamiento de 500 participantes que provinieron de la Ciudad Autónoma de Buenos Aires, así como del Gran Buenos Aires. El reclutamiento se comenzó con 16 participantes llamados semillas. Se realizó el diagnóstico de infección por HIV, hepatitis B y C (HBV y HCV), Treponema pallidum, Virus Papiloma Humano (HPV) y Chlamidias. La colaboración establecida entre los grupos de trabajo enfocados en áreas diversas posibilitó el abordaje conjunto de nuevas estrategias de investigación antes no exploradas en nuestro país. Los resultados más relevantes de esta investigación serán progresivamente publicados en sucesivos números de Actualizaciones en SIDA. PMID:25264397

Carballo-Diéguez, Alex; Ávila, María M; Balán, Iván C.; Marone, Rubén; Pando, María A.; Barreda, Victoria

2011-01-01

302

Perceived pros and cons of smoking and quitting in hard-core smokers: a focus group study  

PubMed Central

Background In the last decade, so-called hard-core smokers have received increasing interest in research literature. For smokers in general, the study of perceived costs and benefits (or ‘pros and cons’) of smoking and quitting is of particular importance in predicting motivation to quit and actual quitting attempts. Therefore, this study aims to gain insight into the perceived pros and cons of smoking and quitting in hard-core smokers. Methods We conducted 11 focus group interviews among current hard-core smokers (n = 32) and former hard-core smokers (n = 31) in the Netherlands. Subsequently, each participant listed his or her main pros and cons in a questionnaire. We used a structural procedure to analyse the data obtained from the group interviews and from the questionnaires. Results Using the qualitative data of both the questionnaires and the transcripts, the perceived pros and cons of smoking and smoking cessation were grouped into 6 main categories: Finance, Health, Intrapersonal Processes, Social Environment, Physical Environment and Food and Weight. Conclusions Although the perceived pros and cons of smoking in hard-core smokers largely mirror the perceived pros and cons of quitting, there are some major differences with respect to weight, social integration, health of children and stress reduction, that should be taken into account in clinical settings and when developing interventions. Based on these findings we propose the ‘Distorted Mirror Hypothesis’. PMID:24548463

2014-01-01

303

Changes to perceptions of the pros and cons of genetic susceptibility testing after APOE genotyping for Alzheimer disease risk  

PubMed Central

Purpose Perceptions about the pros and cons of genetic susceptibility testing are among the best predictors of test utilization. How actual testing changes such perceptions has yet to be examined. Methods In a clinical trial, first-degree relatives of patients with Alzheimer disease received genetic risk assessments for Alzheimer disease including APOE disclosure. Participants rated 11 possible benefits associated with genetic testing (pros) and 10 risks or limitations (cons) before genetic risk disclosure and again 12 months afterward. Results Pros were rated higher than cons at baseline (3.53 vs. 1.83, P < 0.001) and at 12 months after risk disclosure (3.33 vs. 1.88, P < 0.001). Ratings of pros decreased during the 12-month period (3.33 vs. 3.53, P < 0.001). Ratings of cons did not change (1.88 vs. 1.83, P = 0.199) except for a three-item discrimination subscale which increased (2.07 vs. 1.92, P = 0.012). Among specific pros and cons, three items related to prevention and treatment changed the most. Conclusion The process of APOE genetic risk assessment for Alzheimer disease sensitizes some to its limitations and the risks of discrimination; however, 1-year after disclosure, test recipients still consider the pros to strongly outweigh the cons. PMID:21270636

Christensen, Kurt D.; Roberts, J. Scott; Uhlmann, Wendy R.; Green, Robert C.

2011-01-01

304

Teatro Nacional Popular: Un teatro popular o la popularización del teatro (Entrevista con Alonso Alegría).  

E-print Network

va a ser hacia que se constituya en lo mejor del medio; pero a partir del medio, como una culminación del medio. El mismo concepto que un seleccionado nacional de fútbol, las estrellas de los diferentes equipos se reúnen para hacer un equipazo... pensar en un elenco como una culminación. Siguiendo con la metáfora futbolística, no había veinte, había cuatro equipos de fútbol; resultaba que no había ni siquiera cuatro, que eran los mismos once juga dores que rotaban de equipo en equipo y se...

Podesta A., Bruno

1973-10-01

305

[Severe acute asthma: isoflurane administration via AnaConDa™, is it safe?].  

PubMed

Standard treatments against severe acute asthma can be insufficient and need salvation treatments, such as isoflurane delivery. These treatments have not been much assessed and could lead to unrecognized side-effects. We report the case of a young man who suffered from intracranial hypertension associated with severe hypercapnia during the delivery of isoflurane via the system AnaConDa™ or Anaesthetic Conserving Device™ (ACD) (Sedama Medical). The rising of PaCO(2) appears to be linked to an ACD-dependent increase in the dead space. PMID:21146349

Chaillan, M; Badin, J; Kerforne, T; Voultoury, J; Pinsard, M

2011-01-01

306

'El teatro es un camino de autoconocimiento': Entrevista con Liuba Cid, directora teatral cubana  

E-print Network

Medeamaterial. Lo representamos en Madrid y en gira por provincias. He estado también en México, realizando una labor intensa por la zona de Quintana Roo, Yucatán con una obra infantil preciosa que en Cuba fue el mejor espectáculo en su género en 1988, de un... Universidad para hacer un intercambio de programas de estudios, de metodologías, pues a mí me atrae mucho la pedagogía y de hecho en cuanto me licencié, empecé a dar clases. Todos los planes de estudio de nuestra Universidad se intentaron traspasar a la...

Bravo-Elizondo, Pedro

1994-10-01

307

T cells produce TRF in response to Con A and factors in T cell hybridoma supernatants.  

PubMed

In recent experiments, a soluble factor (TRF) that mediates the differentiation of anti-immunoglobulin (Ig)-activated B cells to Ig-secreting cells has been identified. TRF works in concert with a growth factor, probably IL 2, in the induction of activated B cells. In previous studies, TRF was identified in culture supernatants of activated T cells and accessory cells, and thus the cellular source (T cell or accessory cell) of the factor was not determined. In the present studies, we succeeded in inducing the production of TRF by T cell populations from which accessory cells had been vigorously depleted. Lymph node cells were depleted of accessory cells by nylon wool adherence and anti-Ia and complement treatment; these cells were activated with Con A and a T cell hybridoma supernatant that contains IL 2. Supernatants from these activated T cell cultures supported the differentiation of anti-Ig-activated B cells to Ig secreting cells. These results show that T cells produce the differentiation factor, and further that they do so in response to ligand (Con A) plus a T cell-derived factor. PMID:6798126

Raulet, D H; Hünig, T; Parker, D C

1982-02-01

308

Uso de Sustancias en Mujeres con Desventaja Social: Riesgo para el Contagio de VIH/SIDA  

PubMed Central

Antecedentes La caracterización epidemiológica en Chile apunta a feminización, pauperización y heterosexualización de la epidemia del VIH, lo que implica un mayor riesgo para las mujeres en desventaja social. Si a esto se suma la utilización de sustancias, la vulnerabilidad de este grupo frente al VIH/SIDA aumenta. Objetivo Describir el uso de sustancias en mujeres con desventaja social e identificar factores de riesgo de contagio de VIH, asociados a este consumo. Material y Método 52 mujeres fueron entrevistadas como parte del proyecto “Testeando una intervención en prevención de VIH/SIDA en mujeres chilenas” GRANT # RO1 TW 006977. Se describen variables sociodemográficas y de consumo de sustancias a través de estadísticas descriptivas y se analiza la relación entre variables a través de pruebas de correlación. Resultados Los resultados indican un perfil sociodemográfico que sitúa a las mujeres en situación de vulnerabilidad frente al contagio de VIH/SIDA, con alto índice de uso de sustancias que acentúa el riesgo. Conclusiones Los hallazgos apuntan a la necesidad de considerar intervenciones que se enfoquen en la prevención de VIH en mujeres, abordando los riesgos asociados al consumo de sustancias. PMID:21197380

Cianelli, R.; Ferrer, L; Bernales, M.; Miner, S.; Irarrázabal, L.; Molina, Y.

2009-01-01

309

Actitudes Éticas de los estudiantes y egresados en carrera de medicina con metodologías activas  

PubMed Central

El presente estudio tiene por objeto desarrollar un diagnostico de la inserción integrada de la ética en la carrera de medicina brasileña con una metodología de aprendizaje basada en problemas y describir las percepciones de actitudes éticas de los estudiantes y egresados. El diseño metodológico es un estudio de caso, descriptivo y documental, con abordaje cualitativo y cuantitativo. La muestra de esta investigación ha sido constituida por 120 estudiantes y 40 egresados de dos promociones del Curso de Medicina de la ESCS. Este proyecto fue aprobado por el Comité de Ética en Investigación - SES/DF. Los estudiantes y egresados de la ESCS demostraron un buen manejo en el abordaje de los conflictos éticos y respeto a los pacientes. Sin embargo, el análisis de sensibilidad ética mostró una fragilidad en las percepciones y aptitudes inapropiadas de los estudiantes de la carrera de medicina, identificada básicamente en los años iniciales, que necesitan más discusiones sistematizadas sobre los aspectos éticos y bioéticos integrados a las actividades prácticas para estimular y fortalecer la reflexión ética de los estudiantes. PMID:20981242

Novaes, Maria Rita Carvalho Garbi; Novaes, Luiz Carlos Garcez; Guilhem, Dirce; Stepke, Fernando Lolas; Silveira, Carla Cristina Costa; Komatsu, Ricardo Shoiti; Trindade, Eliane Mendonça Vilar; Guiotti, Murilo Galvão

2010-01-01

310

Feeding of grey squirrels (Sciurus carolinensis) with the contraceptive agent DiazaCon™: effect on cholesterol, hematology, and blood chemistry.  

PubMed

Grey squirrels (Sciurus carolinensis) are an invasive species in Britain and Italy. They have replaced native red squirrels (Sciurus vulgaris) throughout most of Britain, and cause damage to trees. Currently, lethal control is used to manage grey squirrel populations in Britain, but nonlethal methods might be more acceptable to the public. One such method is contraception with 20,25-diazacholesterol dihydrochloride (DiazaCon™). DiazaCon™ inhibits the conversion of desmosterol to cholesterol, resulting in increasing desmosterol concentrations and decreasing cholesterol concentrations. Because cholesterol is needed for the synthesis of steroid reproductive hormones, such as progesterone and testosterone, inhibition of cholesterol synthesis indirectly inhibits reproduction. Desmosterol is used as a marker of efficacy in laboratory studies with species that do not reproduce readily in captivity. Grey squirrels were gavaged with a DiazaCon™ solution for 2 days, and then fed DiazaCon™-coated peanuts for an additional 8 days at target doses of 50 and 100 mg DiazaCon™ per kg body weight. There was a significant difference in cholesterol concentrations in the treatment groups compared to the control group. Cholesterol was reduced by ? 40% for 2 months in both treatment groups. There were no differences among groups with respect to blood chemistry and hematology parameters, and mean values are reported. The mean overall dose of DiazaCon™ received was 29.0 ± 1.6 and 55.3 ± 4.3 mg/kg in the low (50 mg/kg) and high dose (100 mg/kg) groups, respectively. DiazaCon™ might provide an effective, acceptable alternative to lethal control. PMID:22182332

Yoder, Christi A; Mayle, Brenda A; Furcolow, Carol A; Cowan, David P; Fagerstone, Kathleen A

2011-12-01

311

A comparison between LCM virus-specific secondary cytotoxic T lymphocytes generated by Con A and by the homologous antigen.  

PubMed Central

An investigation was made of the properties of cytotoxic T cells induced by Con A and exposure to LCM virus-infected cells. As a basis for such studies, the optimal conditions for in vitro Con A stimulation of in vivo LCM virus-primed C3H mouse splenocytes were determined. The most potent cytotoxicity was obtained when responder cells were cultured in the presence of Con A in a concentration of 2 micrograms/ml for 3 days, but strong cytotoxicity was also measured on days 2 and 4. When stimulation was performed by the homologous antigen maximal response was seen on day 4 although marked cytotoxicity was also noted on day 3. Effector cells produced by the two different procedures showed equally high degrees of cytotoxicity against LCM virus-infected target cells, whereas they did not appear cytotoxic against non-infected targets. If LCM virus-immune mice were treated intravenously with 280 micrograms of Con A per animal, moderate cytotoxicity was demonstrable in splenocytes from these mice 1, 2 and 3 days after treatment. The in vitro generation of secondary cytotoxicity by Con A as well as by the homologous antigen was found to be totally dependent on DNA synthesis. The reactivated cells were investigated for in vivo anti-viral effect by measuring their ability to protect intracerebrally LCM virus-infected mice from a fatal outcome of this infection. LCM virus-primed splenocytes stimulated by the homologous antigen caused complete protection, while Con A-reactivated cells did not protect at all. Secondary cytotoxic cells stimulated by Con A and by LCM virus showed fairly similar in vitro characteristics, but fundamentally different in vivo qualities. PMID:315920

Marker, O; Andersen, G T

1979-01-01

312

Comparison of phenotypic methods in predicting methicillin resistance in coagulase-negative Staphylococcus (CoNS) from animals.  

PubMed

Phenotypic detection of methicillin resistance in coagulase-negative Staphylococcus (CoNS) of animal origin has been challenging due to the heterogeneous expression of mecA. To compare different phenotypic methods in predicting the mecA presence in CoNS, a total of 87 CoNS isolates from agricultural animals were analyzed in this study by agar dilution, disk diffusion, and broth microdilution. mecA was present in 81 CoNS isolates. Broth microdilution demonstrated the highest sensitivity of 100% in predicting the mecA presence, followed by 72.8% by agar dilution and 70.4% by disk diffusion. The results indicate that broth microdilution may be more suitable for predicting the presence of mecA in CoNS from animals than the other two methods, although staphylococcal species may also be a factor affecting the sensitivities of the methods as the top three staphylococcal species in this study were Staphylococcus lentus, Staphylococcus sciuri, and Staphylococcus xylosus (a total of 75 of 87). PMID:20538309

Zhang, Yifan; Wang, Xiaogang; LeJeune, Jeffrey T; Zervos, Marcus; Bhargava, Kanika

2011-02-01

313

Pro-Con Debate: Etomidate or Ketamine for Rapid Sequence Intubation in Pediatric Patients  

PubMed Central

When caring for critically ill children, airway management remains a primary determinant of the eventual outcome. Airway control with endotracheal intubation is frequently necessary. Rapid sequence intubation (RSI) is generally used in emergency airway management to protect the airway from passive regurgitation of gastric contents. Along with a rapid acting neuromuscular blocking agent, sedation is an essential element of RSI. A significant safety concern regarding sedatives is the risk of hypotension and cardiovascular collapse, especially in critically ill patients or those with pre-existing comorbid conditions. Ketamine and etomidate, both of which provide effective sedation with limited effects on hemodynamic function, have become increasingly popular as induction agents for RSI. However, experience and clinical investigations have raised safety concerns associated with both etomidate and ketamine. Using a pro-con debate style, the following manuscript discusses the use of ketamine versus etomidate in RSI. PMID:23118665

Scherzer, Daniel; Leder, Mark; Tobias, Joseph D.

2012-01-01

314

Nest destruction elicits indiscriminate con- versus heterospecific brood parasitism in a captive bird.  

PubMed

Following nest destruction, the laying of physiologically committed eggs (eggs that are ovulated, yolked, and making their way through the oviduct) in the nests of other birds is considered a viable pathway for the evolution of obligate interspecific brood parasitism. While intraspecific brood parasitism in response to nest predation has been experimentally demonstrated, this pathway has yet to be evaluated in an interspecific context. We studied patterns of egg laying following experimental nest destruction in captive zebra finches, Taeniopygia guttata, a frequent intraspecific brood parasite. We found that zebra finches laid physiologically committed eggs indiscriminately between nests containing conspecific eggs and nests containing heterospecific eggs (of Bengalese finches, Lonchura striata vars. domestica), despite the con- and heterospecific eggs differing in both size and coloration. This is the first experimental evidence that nest destruction may provide a pathway for the evolution of interspecific brood parasitism in birds. PMID:25512846

Shaw, Rachael C; Feeney, William E; Hauber, Mark E

2014-12-01

315

Nest destruction elicits indiscriminate con- versus heterospecific brood parasitism in a captive bird  

PubMed Central

Following nest destruction, the laying of physiologically committed eggs (eggs that are ovulated, yolked, and making their way through the oviduct) in the nests of other birds is considered a viable pathway for the evolution of obligate interspecific brood parasitism. While intraspecific brood parasitism in response to nest predation has been experimentally demonstrated, this pathway has yet to be evaluated in an interspecific context. We studied patterns of egg laying following experimental nest destruction in captive zebra finches, Taeniopygia guttata, a frequent intraspecific brood parasite. We found that zebra finches laid physiologically committed eggs indiscriminately between nests containing conspecific eggs and nests containing heterospecific eggs (of Bengalese finches, Lonchura striata vars. domestica), despite the con- and heterospecific eggs differing in both size and coloration. This is the first experimental evidence that nest destruction may provide a pathway for the evolution of interspecific brood parasitism in birds. PMID:25512846

Shaw, Rachael C; Feeney, William E; Hauber, Mark E

2014-01-01

316

76 FR 54533 - Pipeline Safety: Issuance of Draft Decision on GexCon US, Inc. Petition for Approval of Flame...  

Federal Register 2010, 2011, 2012, 2013, 2014

This notice advises owners and operators of liquefied natural gas facilities and other interested parties that the Administrator has issued a Draft Decision on GexCon US, Inc.'s petition for approval of Flame Acceleration Simulator (FLACS). The Draft Decision is available for public inspection at Docket No. PHMSA-2011-0101 at http://...

2011-09-01

317

Global trade in dairy products involves complex and con-tentious issues. Viewed broadly from the perspective of  

E-print Network

products containing milk. Nonfat dry milk, cheese and whey products together make up about halfGlobal trade in dairy products involves complex and con- tentious issues. Viewed broadly from. International trade in dairy products is small relative to production and is highly concentrated. Among major

Radeloff, Volker C.

318

Connessione di R Nota. Se c R, con la frase intervallo di centro c intendiamo intervallo di centro c e  

E-print Network

1 Connessione di R Nota. Se c R, con la frase intervallo di centro c intendiamo intervallo di centro c e raggio un numero reale maggiore di 0. La seguente proposizione `e stata dimostrata a lezione ed `e analoga a [GDM, 6.3.1]. Essa dice che un insieme A `e aperto se e solo se per ogni c A esiste

Marconi, Umberto

319

iPathCons and iPathDB: an improved insect pathway construction tool and the database  

PubMed Central

Insects are one of the most successful animal groups on earth. Some insects, such as the silkworm and honeybee, are beneficial to humans, whereas others are notorious pests of crops. At present, the genomes of 38 insects have been sequenced and made publically available. In addition, the transcriptomes of dozens of insects have been sequenced. As gene data rapidly accumulate, constructing the pathway of molecular interactions becomes increasingly important for entomological research. Here, we developed an improved tool, iPathCons, for knowledge-based construction of pathways from the transcriptomes or the official gene sets of genomes. Considering the high evolution diversity in insects, iPathCons uses a voting system for Kyoto Encyclopedia of Genes and Genomes Orthology assignment. Both stand-alone software and a web server of iPathCons are provided. Using iPathCons, we constructed the pathways of molecular interactions of 52 insects, including 37 genome-sequenced and 15 transcriptome-sequenced ones. These pathways are available in the iPathDB, which provides searches, web server, data downloads, etc. This database will be highly useful for the insect research community. Database URL: http://ento.njau.edu.cn/ipath/ PMID:25388589

Zhang, Zan; Yin, Chuanlin; Liu, Ying; Jie, Wencai; Lei, Wenjie; Li, Fei

2014-01-01

320

A Model-based Approach to Reactive Self-Con guring Systems Brian C. Williams and P. Pandurang Nayak  

E-print Network

-based diagnosis, and by framing a model-based con guration manager as a proposi- tional feedback controller architecture for NASA's rst New Millennium spacecraft. Introduction and Desiderata NASA has put forth) to be launched in 1998. The nal pressure, low cost, is of an equal magnitude. To- gether this poses

Veloso, Manuela M.

321

1. Introduction In a uid con ned to a plane layer and heated from below, convection can  

E-print Network

1. Introduction In a uid con#12;ned to a plane layer and heated from below, convection can occur of convective behaviour loses stability to another. This paper is concerned with the analysis of the temporal behaviour of two-dimensional double convection: roll convection in the presence of a stabilizing solute

Rucklidge, Alastair

322

Genova Silicon Valley 10th Edition Incontro a Economia con Ettore Leale, 29 novembre , ore 17, aula Embriaco  

E-print Network

Genova Silicon Valley 10th Edition Incontro a Economia con Ettore Leale, 29 novembre , ore 17, aula Embriaco E' partito da Genova, nel 2005, il ponte tra Italia e Silicon Valley a beneficio degli studenti social network www.siliconvalleystudytour.com, hanno partecipato alle 9 edizioni del Silicon Valley Study

Robbiano, Lorenzo

323

Premio Internazionale Vittorio Foa Citt di Formia in collaborazione con l'IPAB SS. Annunziata e la Fondazione ALZAIA ONLUS  

E-print Network

1 Premio Internazionale Vittorio Foa ­ Città di Formia in collaborazione con l'IPAB SS. Annunziata Regolamento del "Premio Internazionale Vittorio Foa - Città di Formia", pubblicato sul sito www.premiovittoriofoa.it, viene bandita la 1° edizione del premio intitolato alla memoria di Vittorio Foa. Il Premio è istituito

Guidoni, Leonardo

324

TECHNOLOGY EVALUATION REPORT: INTERNATIONAL WASTE TECHNOLOGIES/GEO-CON IN SITU STABILIZATION/SOLIDIFICATION - VOLUME III - UPDATE REPORT  

EPA Science Inventory

The long-term performance tests provide information on the first follow-up sampling and analysis on the SITE program demonstration of the International Waste Technologies additive, and the Geo-Con deep soil mixing equipment. he samples containing PCBs, were collected one year aft...

325

TECHNOLOGY EVALUATION REPORT: INTERNATIONAL WASTE TECHNOLOGIES/GEO-CON IN SITU STABILIZATION/SOLIDIFICATION - VOLUME IV - UPDATE REPORT  

EPA Science Inventory

The long-term performance tests provide information on the first follow-up sampling and analysis on the SITE program demonstration of the International Waste Technologies additive, and the Geo-Con deep soil mixing equipment. he samples containing PCBs, were collected one year aft...

326

Cause of injury: Contact with tentacles which con-tain stinging cells that inject venom into the skin.  

E-print Network

JELLYFISH Cause of injury: Contact with tentacles which con- tain stinging cells that inject venom. Prevention: Take care when swimming in areas known to have jellyfish. Tentacles of some species may trail a great distance from the body. Rubber diving suits give protec- tion. Avoid touching jellyfish washed up

327

Comparación de resultados del método de clasificación de órbitas por análisis de frecuencias con el método de exponentes de Lyapunov  

Microsoft Academic Search

Hemos realizado extensas comparaciones del método de análisis de frecuencias con el de exponentes de Lyapunov. El primero resulta claramente superior por las siguientes razones: 1) permite distinguir distintos tipos de órbitas y no sólo si son regulares o caóticas 2) es mucho más veloz requiriendo mucho menos tiempo de cómputo. La concordancia de resultados es, en general, buena y

D. D. Carpintero; J. C. Muzzio; F. C. Wachlin

1998-01-01

328

SITE PROGRAM APPLICATIONS ANALYSIS REPORT, INTERNATIONAL WASTE TECHNOLOGIES/GEO CON IN-SITU STABILIZATION/SOLIDIFICATION  

EPA Science Inventory

An evaluation was performed of the International Waste Technologies (IWT) HWT-20 additive and the Geo-Con, Inc. deep-soil-mixing equipment for an in situ stabilization/solidification process and its applicability as an on-site treatment method for waste site cleanup. emonstration...

329

DISTRIBUZIONE DELLE FORZE DI CONTATTO NELL'ACCOPPIAMENTO CON INTERFERENZA TRA UNA MOLLA ELICOIDALE ED UN PERNO CILINDRICO  

Microsoft Academic Search

Sommario Il lavoro è incentrato sulla distribuzione delle forze di contatto scambiate nell'accoppiamento con interferenza tra una molla elicoidale ed un perno cilindrico. Tale accoppiamento è utilizzato per realizzare dispositivi di fissaggio efficaci, reversibili, rapidi ed economici. Lo studio è articolato in tre passi. Nel primo passo si sviluppa un modello analitico di previsione della distribuzione delle forze di contatto

I. Spinella; E. Dragonia Castagnetti

330

ScholarShip programS conSideration given to the following min Sat awardS given  

E-print Network

ScholarShip programS conSideration given to the following min Sat (freShmen) and/or gpa number of awardS given & amount renewable? SCHOLARSHIPS AWARDED THROUGH THE UNIVERSITY HONORS PROGRAM University Honors Program Scholarship Incoming freshmen and transfer students who are intellectually curious

Hutcheon, James M.

331

Factor de independencia a la distracción en el trastorno por déficit de atención con hiperactividad: un modelo abreviado  

Microsoft Academic Search

El factor independencia a la distracción (FID) del WISC-R presenta frecuentemente resultados infe- riores al factor organización perceptiva (FOP) y comprensión verbal (FCV) en casos de Trastorno por Déficit de Atención con Hiperactividad (TDAH). La formulación FID< (FCV + FOP)\\/2 tiene buena sensibilidad para TDAH. El objetivo principal de este estudio ha sido reducir el número de pruebas ne- cesarias

José Antonio; López Villalobos

332

Conocimientos, concepciones erróneas y lagunas de los maestros sobre el trastorno por déficit de atención con hiperactividad  

Microsoft Academic Search

Este estudio se diseñó para analizar los conocimientos, concepciones erróneas y lagunas sobre el Tras- torno por Déficit de Atención con Hiperactividad (TDAH) de 193 maestros, como una replicación de un estudio realizado por Sciutto, Terjesen y Bender en el año 2000. Los maestros cumplimentaron el Knowledge of Attention Deficit Hyperactivity Disorder (KADDS) en su versión española, adaptada por los

Sonia Jarque Fernández; Raúl Tárraga Mínguez; Ana Miranda Casas

2007-01-01

333

iPathCons and iPathDB: an improved insect pathway construction tool and the database.  

PubMed

Insects are one of the most successful animal groups on earth. Some insects, such as the silkworm and honeybee, are beneficial to humans, whereas others are notorious pests of crops. At present, the genomes of 38 insects have been sequenced and made publically available. In addition, the transcriptomes of dozens of insects have been sequenced. As gene data rapidly accumulate, constructing the pathway of molecular interactions becomes increasingly important for entomological research. Here, we developed an improved tool, iPathCons, for knowledge-based construction of pathways from the transcriptomes or the official gene sets of genomes. Considering the high evolution diversity in insects, iPathCons uses a voting system for Kyoto Encyclopedia of Genes and Genomes Orthology assignment. Both stand-alone software and a web server of iPathCons are provided. Using iPathCons, we constructed the pathways of molecular interactions of 52 insects, including 37 genome-sequenced and 15 transcriptome-sequenced ones. These pathways are available in the iPathDB, which provides searches, web server, data downloads, etc. This database will be highly useful for the insect research community. Database URL: http://ento.njau.edu.cn/ipath/ PMID:25388589

Zhang, Zan; Yin, Chuanlin; Liu, Ying; Jie, Wencai; Lei, Wenjie; Li, Fei

2014-01-01

334

0^T^^^tf^*nl~~~~ ORNL/CON-154 Nonlinear Analysis of Stirling  

E-print Network

. #12;ORNL/CON-154 Engineering Technology Division NONLINEAR ANALYSIS OF STIRLING ENGINE THERMODYNAMICS encouragement. #12;NONLINEAR ANALYSIS OF STIRLING ENGINE THERMODYNAMICS R. D. Banduric N. C. J. Chen ABSTRACT Numerical solutions to a simplified mathematical formula- tion for Stirling engine thermodynamics, including

Oak Ridge National Laboratory

335

Treatment of plutonium contaminated soil/sediment from the Mound site using the ACT*DE*CON{sup SM} process  

SciTech Connect

The removal and/or treatment of contaminated soil is a major problem facing the US DOE. The EG&G Mound Applied Technologies site in Miamisburg, Ohio, has an estimated 1.5 million cubic feet of soils from past disposal and waste burial practices awaiting remediation from plutonium contamination. This amount includes sediment from the Miami-Erie Canal that was contaminated in 1969 following a pipe- rupture accident. Conventional soil washing techniques that use particle separation would generate too large a waste volume to be economically feasible. Therefore, innovative technologies are needed for the cleanup. The ACT*DE*CON process was developed by SELENTEC for washing soils to selectively dissolve and remove heavy metals and radionuclides. ACT*DE*CON chemically dissolves and removes heavy metals and radionuclides from soils and sediments into an aqueous medium. The ACT*DE*CON process uses oxidative carbonate/chelant chemistry to dissolve the contaminant from the sediment and hold the contaminant in solution. The objective of recent work was to document the proves conditions necessary to achieve the Mound-site and regulatory-cleanup goals using the ACT*DE*CON technology.

Negri, M.C. [Argonne National Lab., IL (United States); Swift, N.A. [SELENTEC, Atlanta, GA (United States); North, J.P. [Rust Remedial Service, Inc., Anderson, SC (United States)

1996-10-01

336

South Florida Sun-Sentinel.com Playing sports year-round has its pros and cons for high  

E-print Network

South Florida Sun-Sentinel.com Playing sports year-round has its pros and cons for high school't mind playing basketball 11 out of 12 months a year. The Westminster Academy senior plays for his school for a college to get a look rather than try and force the colleges to come to me during the school year," Ross

Belogay, Eugene A.

337

Controlando el Deslave de la Irrigacion de Aspersión, la Erosión, y la Perdida del Fósforo con Paja y Poliacrilamido  

Microsoft Academic Search

RESUMEN. Controlar la erosión por deslave y erosión es importante para mantener la productividad del suelo y reducir el destrucción fuera del sitio debido al enriquecimiento de sedimentos y nutrientes. Comparamos los efectos combinados del residuo superficial de PAM en el deslave, perdidas de suelo de suelo irrigado con aspersores en el laboratorio. Hipotizamos que el residuo superficial pudiese mejorar

D. L. Bjorneberg; J. K. Aase; D. T. Westermann

2000-01-01

338

Pros and cons of liver transplantation in human immunodeficiency virus infected recipients  

PubMed Central

Before the introduction of combined highly active antiretroviral therapy, a positive human immunodeficiency virus (HIV) serological status represented an absolute contraindication for solid organ transplant (SOT). The advent of highly effective combined antiretroviral therapy in 1996 largely contributed to the increased demand for SOT in HIV-positive individuals due to increased patients’ life expectancy associated with the increasing prevalence of end-stage liver disease (ESLD). Nowadays, liver failure represents a frequent cause of mortality in the HIV-infected population mainly due to coinfection with hepatitis viruses sharing the same way of transmission. Thus, liver transplantation (LT) represents a reasonable approach in HIV patients with stable infection and ESLD. Available data presently supports with good evidence the practice of LT in the HIV-positive population. Thus, the issue is no longer “whether it is correct to transplant HIV-infected patients”, but “who are the patients who can be safely transplanted” and “when is the best time to perform LT”. Indeed, the benefits of LT in HIV-infected patients, especially in terms of mid- and long-term patient and graft survivals, are strictly related to the patients’ selection and to the correct timing for transplantation, especially when hepatitis C virus coinfection is present. Aim of this article is to review the pros and cons of LT in the cohort of HIV infected recipients. PMID:24833865

Baccarani, Umberto; Righi, Elda; Adani, Gian Luigi; Lorenzin, Dario; Pasqualucci, Alberto; Bassetti, Matteo; Risaliti, Andrea

2014-01-01

339

Indirect Ultraviolet Photodesorption from CO:N2 Binary Ices — an Efficient Grain-gas Process  

NASA Astrophysics Data System (ADS)

Ultraviolet (UV) ice photodesorption is an important non-thermal desorption pathway in many interstellar environments that has been invoked to explain observations of cold molecules in disks, clouds, and cloud cores. Systematic laboratory studies of the photodesorption rates, between 7 and 14 eV, from CO:N2 binary ices, have been performed at the DESIRS vacuum UV beamline of the synchrotron facility SOLEIL. The photodesorption spectral analysis demonstrates that the photodesorption process is indirect, i.e., the desorption is induced by a photon absorption in sub-surface molecular layers, while only surface molecules are actually desorbing. The photodesorption spectra of CO and N2 in binary ices therefore depend on the absorption spectra of the dominant species in the sub-surface ice layer, which implies that the photodesorption efficiency and energy dependence are dramatically different for mixed and layered ices compared with pure ices. In particular, a thin (1-2 ML) N2 ice layer on top of CO will effectively quench CO photodesorption, while enhancing N2 photodesorption by a factor of a few (compared with the pure ices) when the ice is exposed to a typical dark cloud UV field, which may help to explain the different distributions of CO and N2H+ in molecular cloud cores. This indirect photodesorption mechanism may also explain observations of small amounts of complex organics in cold interstellar environments.

Bertin, Mathieu; Fayolle, Edith C.; Romanzin, Claire; Poderoso, Hugo A. M.; Michaut, Xavier; Philippe, Laurent; Jeseck, Pascal; Öberg, Karin I.; Linnartz, Harold; Fillion, Jean-Hugues

2013-12-01

340

Pros and cons of liver transplantation in human immunodeficiency virus infected recipients.  

PubMed

Before the introduction of combined highly active antiretroviral therapy, a positive human immunodeficiency virus (HIV) serological status represented an absolute contraindication for solid organ transplant (SOT). The advent of highly effective combined antiretroviral therapy in 1996 largely contributed to the increased demand for SOT in HIV-positive individuals due to increased patients' life expectancy associated with the increasing prevalence of end-stage liver disease (ESLD). Nowadays, liver failure represents a frequent cause of mortality in the HIV-infected population mainly due to coinfection with hepatitis viruses sharing the same way of transmission. Thus, liver transplantation (LT) represents a reasonable approach in HIV patients with stable infection and ESLD. Available data presently supports with good evidence the practice of LT in the HIV-positive population. Thus, the issue is no longer "whether it is correct to transplant HIV-infected patients", but "who are the patients who can be safely transplanted" and "when is the best time to perform LT". Indeed, the benefits of LT in HIV-infected patients, especially in terms of mid- and long-term patient and graft survivals, are strictly related to the patients' selection and to the correct timing for transplantation, especially when hepatitis C virus coinfection is present. Aim of this article is to review the pros and cons of LT in the cohort of HIV infected recipients. PMID:24833865

Baccarani, Umberto; Righi, Elda; Adani, Gian Luigi; Lorenzin, Dario; Pasqualucci, Alberto; Bassetti, Matteo; Risaliti, Andrea

2014-05-14

341

Long-Acting Injectable Antipsychotics for First-Episode Schizophrenia: The Pros and Cons  

PubMed Central

Clinical and psychosocial deterioration associated with schizophrenia occurs within the first few years following the onset of the illness. Therefore, to improve the long-term prognosis, it is important to provide schizophrenia patients with intensive treatment following their first episode. Relapse is highly associated with partial medication adherence or nonadherence in patients with first-episode schizophrenia. Recent studies suggest that long-acting injectable (LAI) antipsychotics compared with oral antipsychotics are more effective for medication adherence and relapse prevention. Moreover, some clinical guidelines for the treatment of schizophrenia suggested that LAI antipsychotics should be considered when patients are nonadherent “at any stage.” Decreased compliance is a common cause of relapse during the initial stages of the disease. Therefore, LAI antipsychotics should be highly considered when treating patients with first-episode schizophrenia. In the present paper, clinical trial data and current guidelines on the use of LAI antipsychotics for first-episode schizophrenia are discussed as well as the pros and cons of this treatment option. PMID:22966439

Kim, Borah; Lee, Sang-Hyuk; Yang, Yen Kuang; Park, Jong-Il; Chung, Young-Chul

2012-01-01

342

Estereotipos Sexuales y su Relación con Conductas Sexuales Riesgosas1,2,3  

PubMed Central

Resumen Los estereotipos sexuales son creencias generalmente aceptadas y poco cuestionadas que podrían contribuir a cómo los hombres y las mujeres debemos expresar nuestra sexualidad. Los objetivos de este estudio eran identificar cuántos hombres y mujeres heterosexuales en Puerto Rico endosaban ciertos estereotipos acerca de la sexualidad masculina y femenina y explorar la relación entre el endoso de estos estereotipos sexuales y las actitudes hacia el condón masculino y su uso en relaciones sexuales vaginales Llevamos a cabo un estudio descriptivo-correlacional mediante el cual le administramos dos escalas, una sobre sexualidad masculina y otra sobre sexualidad femenina a un grupo de 429 personas heterosexuales. Encontramos que los hombres endosaron estereotipos sexuales masculinos y femeninos más que las mujeres y que estos tienden a tener una visión más conservadora respecto a la sexualidad femenina que la que tienen sobre su propia sexualidad. Las mujeres, por otra parte, tienden a ver su propia sexualidad y la sexualidad masculina en términos menos estereotipados y más equitativos. También encontramos que a mayor endoso de creencias tradicionales sobre la sexualidad masculina y femenina, peor la actitud hacia el uso del condón masculino. Sin embargo, el endosar estereotipos sexuales masculinos y/o femeninos no se relacionó con el uso del condón. Estos hallazgos contradicen la literatura que sugiere que estos estereotipos sexuales y de género resultan en conductas sexuales de alto riesgo, lo cual tiene implicaciones importantes para el desarrollo e implementación de programas de prevención. PMID:24575164

Pérez-Jiménez, David; Orengo-Aguayo, Rosaura E.

2012-01-01

343

Assessing ComSciCon 2013: A science communication workshop for STEM graduate students (Invited)  

NASA Astrophysics Data System (ADS)

We report on the efficacy of Communicating Science 2013, a science communication workshop for graduate students. Effective science communication is imperative for the sharing of scientific ideas, continued funding and support from policy makers, and education of the public. Science graduate students are a prime group to target for communication training, as they will be our future scientists, educators, and EPO professionals. To this end, Communicating Science 2013 (ComSciCon), a workshop organized by and for STEM graduate students, was held in June of this year. This workshop taught graduate students from around the nation to effectively communicate science to both their peers and the public. To learn about grad students' attitudes toward science communication and establish the workshop's efficacy, we surveyed the participants both before and after the workshop. This assessment probed topics such as communication preparation the participants have already received, how science communication is perceived in their home department, and what participants gained from the workshop. We report the results here.

Kohler, S.; Ranjan, S.; Sanders, N.; Morey, S.

2013-12-01

344

Steelmaking Slags  

NASA Astrophysics Data System (ADS)

The phosphate-enrichment behavior has experimentally been investigated in CaO-SiO2-FeO-Fe2O3-P2O5 steelmaking slags. The reaction ability of structural units in the slags has been represented the mass action concentration from the developed ion and molecule coexistence theory (IMCT)- model based on the IMCT. The defined enrichment possibility and enrichment degree of solid solutions containing P2O5 from the developed IMCT- model have been verified from the experimental results. The effects of binary basicity, the mass percentage ratio , and mass percentage of P2O5 in the initial slags on phosphate-enrichment behavior in the slags has also been discussed. The results show that the P2O5 component can easily be bonded by CaO to form tricalcium phosphate 3 CaO·P2O5, and the formed 3CaO·P2O5 can react with the produced dicalcium silicate 2CaO·SiO2 to generate solid-solution 2CaO·SiO2-3CaO·P2O5 under fixed cooling conditions. The maximum value of the defined enrichment degree of solid-solution 2CaO·SiO2-3CaO·P2O5 is obtained as 0.844 under conditions of binary basicity as 2.5 and the mass percentage ratio as 0.955 at fixed cooling conditions.

Li, Jin-yan; Zhang, Mei; Guo, Min; Yang, Xue-Min

2014-10-01

345

Nutrient Management Specialist or Broker Signature The following appendices need to accompany the Nutrient Balance Worksheets if applicable  

E-print Network

Application SeasonManure Group Application Management February 6, 2009 Starter/Other Fertilizer (lb Nutrient balances for P2O5 and K2O are based Soil Test Recommendations. Fields 4 ­ 8 have a 150' manure for P2O5 and K2O are based Soil Test Recommendations. Fields 4 ­ 8 have a 150' manure application

Guiltinan, Mark

346

RAZA, COLOR, RELIGIN, SEXO, PROCEDENCIA El Ttulo VII de la Ley de Derechos Civiles (Civil Rights Act) de 1964, con sus modificaciones,  

E-print Network

Oportunidades en el Empleo (Equal Employment Opportunity Commission, EEOC) de actuar en representación suya y Discriminación Laboral por Edad (Age Discrimination in Employment Act) de 1967, con sus modificaciones, protege Igualdad en las Remuneraciones (Equal Pay Act) de 1963, con sus modificaciones, también prohíbe la

347

Problemas de rutas con ventanas de tiempo y carga y descarga simultanea: diseño de filtros en algoritmos de intercambio (caso de un vehículo)  

Microsoft Academic Search

En este trabajo se propone un método para diseñar algoritmos para el Problema de Rutas de Vehículos con Ventanas de Tiempo, y con Carga y Descarga simultánea (VRPTW mixto) basados en las conocidas técnicas de mejora o intercambio r-ópotimos. Este método consiste en incorporar un mecanismo que filtre los intercambios que van a dar lugar a rutas factibles. El resultado

Joaquín Antonio Pacheco Bonrostro; Cristina Rocio Delgado Serna

1997-01-01

348

Analytical studies of groundwater-head uctuation in a coastal conned aquifer overlain by a semi-permeable layer with storage  

E-print Network

Analytical studies of groundwater-head ¯uctuation in a coastal con®ned aquifer overlain by a semi are carried out to investigate groundwater-head changes in a coastal aquifer system in response to tidal and storage of the semi-permeable layer on the tide-induced groundwater-head ¯uctuation in the semi

Jiao, Jiu Jimmy

349

Estudio financiado por los NIH indica un aumento de la supervivencia en hombres con cáncer de próstata metastásico que reciben quimioterapia desde el inicio de la terapia hormonal  

Cancer.gov

Los hombres con cáncer de próstata metastásico sensible a las hormonas que recibieron el fármaco quimioterapéutico docetaxel al inicio de la terapia hormonal convencional vivieron más tiempo que los pacientes que recibieron solo terapia hormonal, de acuerdo con los resultados preliminares de un estudio clínico controlado y aleatorizado patrocinado por los Institutos Nacionales de la Salud (NIH).

350

Characterization Data Package for Containerized Sludge Samples Collected from Engineered Container SCS-CON-210  

SciTech Connect

This data package contains the K Basin sludge characterization results obtained by Pacific Northwest National Laboratory during processing and analysis of four sludge core samples collected from Engineered Container SCS-CON-210 in 2010 as requested by CH2M Hill Plateau Remediation Company. Sample processing requirements, analytes of interest, detection limits, and quality control sample requirements are defined in the KBC-33786, Rev. 2. The core processing scope included reconstitution of a sludge core sample distributed among four to six 4-L polypropylene bottles into a single container. The reconstituted core sample was then mixed and subsampled to support a variety of characterization activities. Additional core sludge subsamples were combined to prepare a container composite. The container composite was fractionated by wet sieving through a 2,000 micron mesh and a 500-micron mesh sieve. Each sieve fraction was sampled to support a suite of analyses. The core composite analysis scope included density determination, radioisotope analysis, and metals analysis, including the Waste Isolation Pilot Plant Hazardous Waste Facility Permit metals (with the exception of mercury). The container composite analysis included most of the core composite analysis scope plus particle size distribution, particle density, rheology, and crystalline phase identification. A summary of the received samples, core sample reconstitution and subsampling activities, container composite preparation and subsampling activities, physical properties, and analytical results are presented. Supporting data and documentation are provided in the appendices. There were no cases of sample or data loss and all of the available samples and data are reported as required by the Quality Assurance Project Plan/Sampling and Analysis Plan.

Fountain, Matthew S.; Fiskum, Sandra K.; Baldwin, David L.; Daniel, Richard C.; Bos, Stanley J.; Burns, Carolyn A.; Carlson, Clark D.; Coffey, Deborah S.; Delegard, Calvin H.; Edwards, Matthew K.; Greenwood, Lawrence R.; Neiner, Doinita; Oliver, Brian M.; Pool, Karl N.; Schmidt, Andrew J.; Shimskey, Rick W.; Sinkov, Sergey I.; Snow, Lanee A.; Soderquist, Chuck Z.; Thompson, Christopher J.; Trang-Le, Truc LT; Urie, Michael W.

2013-09-10

351

(Con)text-specific effects of visual dysfunction on reading in posterior cortical atrophy.  

PubMed

Reading deficits are a common early feature of the degenerative syndrome posterior cortical atrophy (PCA) but are poorly understood even at the single word level. The current study evaluated the reading accuracy and speed of 26 PCA patients, 17 typical Alzheimer's disease (tAD) patients and 14 healthy controls on a corpus of 192 single words in which the following perceptual properties were manipulated systematically: inter-letter spacing, font size, length, font type, case and confusability. PCA reading was significantly less accurate and slower than tAD patients and controls, with performance significantly adversely affected by increased letter spacing, size, length and font (cursive < non-cursive), and characterised by visual errors (69% of all error responses). By contrast, tAD and control accuracy rates were at or near ceiling, letter spacing was the only perceptual factor to influence reading speed in the same direction as controls, and, in contrast to PCA patients, control reading was faster for larger font sizes. The inverse size effect in PCA (less accurate reading of large than small font size print) was associated with lower grey matter volume in the right superior parietal lobule. Reading accuracy was associated with impairments of early visual (especially crowding), visuoperceptual and visuospatial processes. However, these deficits were not causally related to a universal impairment of reading as some patients showed preserved reading for small, unspaced words despite grave visual deficits. Rather, the impact of specific types of visual dysfunction on reading was found to be (con)text specific, being particularly evident for large, spaced, lengthy words. These findings improve the characterisation of dyslexia in PCA, shed light on the causative and associative factors, and provide clear direction for the development of reading aids and strategies to maximise and sustain reading ability in the early stages of disease. PMID:24841985

Yong, Keir X X; Shakespeare, Timothy J; Cash, Dave; Henley, Susie M D; Warren, Jason D; Crutch, Sebastian J

2014-08-01

352

The relationship between surface incline and con-focal chromatic aberration sensor response  

NASA Astrophysics Data System (ADS)

The limiting performance characteristics of con-focal chromatic aberration displacement sensors are angular tolerance and the gauge range over which an output is provided. The sensor selected in this study is used to measure groove profiles in early recorded surfaces. The sensor is used in a 3 dimensional cylinder scanning system for the measurement of wax cylinder recordings, where the 3 dimensional data is used to create a map of the measured surface for archival purposes. The generation of the map allows the sound recorded on the surface to be decoded without physical contact to the surface. It has been shown in a previous study that data resolution of 10-20nm are required for this application, and that the relationship between the data output and the surface incline is critical to system performance. To understand the relationship with surface slope the sensor is used here in a study of the measurement of calibration ball surfaces, and follows a previous study on machined grooves with known angular properties. In this study a range of calibration spherical surfaces are used to investigate the relationship between the sensor output and measurement parameters, including the distance between the sensor optical head and the surface. A linear least squares method is used to evaluate the 3D radius of the measured surfaces, and this is used as a parameter to evaluate the systematic errors. The results show that there is a low level of systematic form error typically below 1?m, but that this error has a significant impact on the evaluation of the radius. Recommendations are made on methods for optimisation of sensor performance.

McBride, J. W.; Boltryk, P. J.; Zhao, Z.

2007-07-01

353

(Con)text-specific effects of visual dysfunction on reading in posterior cortical atrophy  

PubMed Central

Reading deficits are a common early feature of the degenerative syndrome posterior cortical atrophy (PCA) but are poorly understood even at the single word level. The current study evaluated the reading accuracy and speed of 26 PCA patients, 17 typical Alzheimer's disease (tAD) patients and 14 healthy controls on a corpus of 192 single words in which the following perceptual properties were manipulated systematically: inter-letter spacing, font size, length, font type, case and confusability. PCA reading was significantly less accurate and slower than tAD patients and controls, with performance significantly adversely affected by increased letter spacing, size, length and font (cursive < non-cursive), and characterised by visual errors (69% of all error responses). By contrast, tAD and control accuracy rates were at or near ceiling, letter spacing was the only perceptual factor to influence reading speed in the same direction as controls, and, in contrast to PCA patients, control reading was faster for larger font sizes. The inverse size effect in PCA (less accurate reading of large than small font size print) was associated with lower grey matter volume in the right superior parietal lobule. Reading accuracy was associated with impairments of early visual (especially crowding), visuoperceptual and visuospatial processes. However, these deficits were not causally related to a universal impairment of reading as some patients showed preserved reading for small, unspaced words despite grave visual deficits. Rather, the impact of specific types of visual dysfunction on reading was found to be (con)text specific, being particularly evident for large, spaced, lengthy words. These findings improve the characterisation of dyslexia in PCA, shed light on the causative and associative factors, and provide clear direction for the development of reading aids and strategies to maximise and sustain reading ability in the early stages of disease. PMID:24841985

Yong, Keir X.X.; Shakespeare, Timothy J.; Cash, Dave; Henley, Susie M.D.; Warren, Jason D.; Crutch, Sebastian J.

2014-01-01

354

The politics of energy: Case study of Con Edison's nuclear complex at Indian Point, New York. Working paper  

Microsoft Academic Search

The possible impact of areawide residential location policy on future residential electricity usage in the Tri-State Metropolitan Region centering on New York City is investigated. This paper focuses on the politics of energy in its discussion of Con Edison's Nuclear Complex at Indian Point. The first period of planning (1954 to the late 60's) comprised a relatively closed decision-making process

J. Aron; K. Seelman

1974-01-01

355

Storm impacts along European coastlines. Part 1: The joint effort of the MICORE and ConHaz Projects  

Microsoft Academic Search

The current paper discusses the topic of marine storm impact along European coastlines, presenting results from two FP7 Projects currently focusing on this topic, one working on the physical aspects of the problem (MICORE) and the other one on the socio-economic implications (ConHaz).The MICORE Project aims to provide on-line predictions of storm-related physical hazards (hydrodynamic as well as morphodynamic). The

Paolo Ciavola; Oscar Ferreira; Piet Haerens; Mark Van Koningsveld; Clara Armaroli; Quentin Lequeux

2011-01-01

356

2Crateri lunari Quiz 1. Usando un righello con la scala in millimetri, qual' la scala di questa immagine  

E-print Network

2Crateri lunari Quiz 1. ­ Usando un righello con la scala in millimetri, qual'è la scala di questa, quindi se questa equivale ad una larghezza di 153 km, la scala dell'immagine è di 183 km/153 mm = 1.2 km/mm. Soluzione 2: Il diametro è di circa 85 mm che usando la scala dell'immagine equivale a 85 mm x 1.2 km

Christian, Eric

357

CHILES Con Pol: Probing galaxy evolution, the dark Universe, and cosmic magnetism with a deep 1000 hour Jansky VLA survey  

NASA Astrophysics Data System (ADS)

We recently started a 1000 hour campaign to observe 0.2 square degrees of the COSMOS field in full polarization continuum at 1.4 GHz with the Jansky VLA, as part of a joint program with the spectral line COSMOS HI Large Extragalactic Survey (CHILES). When complete, we expect our CHILES Continuum Polarization (CHILES Con Pol) survey to reach an unprecedented SKA-era sensitivity of 0.7 uJy per 4 arcsecond FWHM beam. Here we present the key goals of CHILES Con Pol, which are to (i) produce a source catalog of legacy value to the astronomical community, (ii) measure differential source counts in total intensity, linear polarization, and circular polarization in order to constrain the redshift and luminosity distributions of source populations, (iii) perform a novel weak lensing study using radio polarization as an indicator of intrinsic alignment to better study dark energy and dark matter, and (iv) probe the unknown origin of cosmic magnetism by measuring the strength and structure of intergalactic magnetic fields in the filaments of large scale structure. The CHILES Con Pol source catalog will be a useful resource for upcoming wide-field surveys by acting as a training set for machine learning algorithms, which can then be used to identify and classify radio sources in regions lacking deep multiwavelength coverage.

Hales, Christopher A.; Chiles Con Pol Collaboration

2014-04-01

358

Desarrollo de la Escala sobre el Estigma Relacionado con el VIH/SIDA para Profesionales de la Salud mediante el uso de métodos mixtos123  

PubMed Central

El estigma relacionado con el VIH/SIDA continúa siendo un obstáculo para la prevención primaria y secundaria del VIH. Las consecuencias para las personas que viven con la enfermedad han sido muy documentadas y continúan siendo una gran preocupación para las personas que proveen servicios de salud y para aquellas que investigan el tema. Estas consecuencias son preocupantes cuando el estigma emana de profesionales de la salud porque se puede limitar el acceso a los servicios. Uno de los principales obstáculos para la investigación del estigma relacionado con el VIH en Puerto Rico es la falta de instrumentos cuantitativos para evaluar las manifestaciones del estigma entre profesionales de la salud. El objetivo principal de este estudio fue desarrollar y probar las propiedades psicométricas de una escala sobre el estigma relacionado con el VIH/SIDA culturalmente apropiada para personas que proveen servicios de salud puertorriqueñas y desarrollar una versión corta de la escala que pudiera usarse en escenarios clínicos con tiempo limitado. El instrumento desarrollado estuvo basado en evidencia cualitativa recopilada entre profesionales y estudiantes de profesiones de la salud puertorriqueños/as (n=80) y administrado a una muestra de 421 profesionales de la salud en adiestramiento. La escala contenía 12 dimensiones del estigma relacionado con el VIH/SIDA. El análisis cuantitativo corroboró 11 de ellas, teniendo como resultado un instrumento con validez y confiabilidad satisfactoria. Estas dimensiones, a su vez, fueron subcomponentes de un factor de estigma general superior. PMID:20333258

Varas-Díaz, Nelson; Neilands, Torsten B.; Guilamo-Ramos, Vincent; Cintrón Bou, Francheska N.

2009-01-01

359

Fuentes de variabilidad en el diagnóstico de gastritis atrófica multifocal asociada con la infección por Helicobacter pylori1  

PubMed Central

RESUMEN Introducción El mapeo de las diferentes regiones del estómago y el número de fragmentos de mucosa gástrica disponibles para evaluación histopatológica son fuentes importantes de variación en el momento de clasificar y hacer la gradación de la gastritis crónica. Objetivos Estimar la sensibilidad del número de fragmentos de mucosa gástrica necesarios para establecer los diagnósticos de gastritis atrófica con metaplasia intestinal (MI), displasia y estado de infección por Helicobacter pylori. Además evaluar la variabilidad intra-observador en la clasificación de estas lesiones precursoras del cáncer gástrico. Materiales y métodos En una cohorte de 6 años de seguimiento se evaluaron 1,958 procedimientos de endoscopia realizados por dos gastroenterólogos. En cada procedimiento y de cada participante se obtuvieron 5 biopsias de mucosa gástrica que representaban antro, incisura angularis y cuerpo. Un único patólogo hizo la interpretación histológica de las 5 biopsias y proporcionó un diagnóstico definitivo global que se utilizó como patrón de referencia. Cada fragmento de mucosa gástrica examinado condujo a un diagnóstico individual para cada biopsia que se comparó con el patrón de referencia. La variabilidad intra-observador se evaluó en 127 personas que corresponden a una muestra aleatoria de 20% del total de endoscopias hechas a los 72 meses de seguimiento. Resultados La sensibilidad del diagnóstico de MI y displasia gástrica aumentó de manera significativa con el número de fragmentos de mucosa gástrica evaluados El sitio anatómico de mayor sensibilidad para el diagnóstico de MI y displasia fue la incisura angularis. Para descubrir H. pylori se logró alta sensibilidad con el estudio de un solo fragmento de mucosa gástrica (95.9%) y fue independiente del sitio de obtención de la biopsia. El acuerdo intra-observador para el diagnóstico de gastritis crónica fue 86.1% con valor kappa de 0.79 IC 95% (0.76-0.85). Las biopsias fijadas en alcohol fueron inadecuadas para demostrar H. pylori e interpretar los cambios de displasia. Conclusión El número de fragmentos de mucosa gástrica evaluados, el método de fijación y la región del estómago donde se obtienen las biopsias son factores muy importantes para lograr una correcta clasificación de la gastritis crónica atrófica multifocal. PMID:25267864

Bravo, Luis Eduardo; Bravo, Juan Carlos; Realpe, José Luis; Zarama, Guillermo; Piazuelo, MarÍa Blanca; Correa, Pelayo

2014-01-01

360

Collaborazione con il Cinema Mexico di Milano (1) Il Cinema Mexico di Via Savona n 57 Milano ha una programmazione caratterizzata da  

E-print Network

Collaborazione con il Cinema Mexico di Milano (1) Il Cinema Mexico di Via Savona n° 57 ­ Milano ha' CICLISTICA MILANESE tutti i lunedì biglietto ridotto a 4 euro, per tutti coloro che si recano al cinema

De Cindio, Fiorella

361

ESERCIZI Sulla stima dell'errore di integrazione del 20/11/08 1. Applica il metodo di Simpson con h = 1  

E-print Network

1 ESERCIZI Sulla stima dell'errore di integrazione del 20/11/08 1. Applica il metodo di Simpson con dei trapezi e il meto- do di Simpson per approssimare questo integrale e applica l'estrapo- lazione di

Guerrini, Carla

362

Con motivo de la visita a Espaa del presidente de la Rep-blica Popular China, Hu Jintao, el rector de la Universidad  

E-print Network

exámenes, tra- ducción e interpretación, turismo, comercio, banca y medici- na tradicional china Internacional, Liu Bin, y contaba, entre otros, con los rectores de las universidades Jiaotong de Beijing

Autonoma de Madrid, Universidad

363

Antidepressant-like effect of Canavalia brasiliensis (ConBr) lectin in mice: evidence for the involvement of the glutamatergic system.  

PubMed

Lectins recognize and reversibly bind to carbohydrates attached to proteins and lipids modulating a variety of signaling pathways. We previously showed that ConBr, a lectin from Canavalia brasiliensis seeds, produced an antidepressant-like effect in mice by modulating the monoaminergic neurotransmitter systems. Moreover, ConBr blocked hippocampal neurotoxicity induced by quinolinic acid in vivo and by glutamate in vitro, suggesting a neuroprotective activity of ConBr via glutamatergic system modulation. Therefore, the present study was undertaken to investigate the involvement of the N-methyl-D-aspartate (NMDA) receptor and the L-arginine-nitric oxide (NO) pathway in the antidepressant-like action displayed by ConBr in the forced swimming test (FST). With the aim of verifying the involvement of NMDA receptors in the antidepressant-like effect of ConBr (10 ?g/site, i.c.v.), an intracerebroventricular (i.c.v.) pretreatment with either NMDA (0.1 pmol/site) or D-serine (30 ?g/site) was carried out. The results show that both treatments blocked the effect of ConBr. Furthermore, the coadministration of subeffective doses of the NMDA receptor antagonist MK-801 (0.001 mg/kg, i.p.) or ketamine (0.1 mg/kg, i.p.; NMDA receptor antagonist) and ConBr (0.1 ?g/site, i.c.v.) caused a synergistic reduction in immobility time. In order to verify the dependence of the L-arginine-NO-cGMP pathway, on the effect of ConBr in the FST, a pretreatment with the NO precursor, L-arginine (750 mg/kg, i.p.), or the PDE5 inhibitor, sildenafil (5 mg/kg, i.p.), was performed. Both drugs abolished the antidepressant-like action of ConBr. Finally, the administration of subeffective doses of the soluble guanylate cyclase inhibitor 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ; 30 pmol/site, i.c.v.) and ConBr (0.1 ?g/site, i.c.v.) produced a synergistic antidepressant-like effect in the FST. Taken together, the results suggest that the antidepressant-like effect of ConBr in the FST involves NMDA receptor inhibition and reduction in NO and cGMP synthesis. PMID:24650588

Rieger, Débora K; Costa, Ana Paula; Budni, Josiane; Moretti, Morgana; Barbosa, Sabrina Giovana Rocha; Nascimento, Kyria S; Teixeira, Edson H; Cavada, Benildo S; Rodrigues, Ana Lúcia S; Leal, Rodrigo B

2014-07-01

364

"Estudio tribologico de aceros para moldes. Aplicacion al moldeo por inyeccion de polibutilentereftalato reforzado con fibra de vidrio"  

NASA Astrophysics Data System (ADS)

Mould materials for injection moulding of polymers and polymer-matrix composites represent a relevant industrial economic sector due to the large quantity of pieces and components processed. The material selection for mould manufacturing, its composition and heat treatment, the hardening procedures and machining and finishing processes determine the service performance and life of the mould. In the first part of the present study, the relationship between the hardness and microstructure and the wear resistance of mould steels from large blocks has been studied by pin-on-disc tests, studying the main wear mechanisms. In order to determine the surface damage on mould steels under real injection conditions, different commercial steels have been studied by measuring the variation of surface roughness with the number of injected pieces with different reinforcement percentages and different mould geometries, by using optical profilometry and scanning electron microscopy techniques. It was important to determine the variation of surface roughness of the moulded pieces with the number of injection operations. The materials used were polybutyleneterephthalate pure and reinforced with either 20% or 50% glass fibre. For the different mould designs, the evolution of the glass fibre orientation with injection flow has been determined by image analysis and related to roughness changes and surface damage, both of the composite parts and of the mould steel surface. Finally, the abrasion resistance of the composite parts has been studied by scratch tests as a function of the number of injected parts and of the scratch direction with respect to injection flow and glass fibre orientation. Los materiales para moldes de inyeccion de polimeros y materiales compuestos representan un sector economicamente muy relevante debido al gran aumento del numero de componentes fabricados a partir de materiales polimericos obtenidos mediante moldeo por inyeccion. La seleccion del material para la fabricacion del molde, tienen una gran influencia sobre su comportamiento en servicio a lo largo de la vida util del molde. En la primera parte del presente estudio, a partir de ensayos punzon sobre disco, se ha determinado la relacion entre la resistencia al desgaste y la dureza de aceros para moldes obtenidos a partir de bloques de gran espesor, estudiando los principales mecanismos de desgaste que tienen lugar. A continuacion, con el fin de determinar el dano superficial que sufren los aceros para moldes en condiciones reales de inyeccion, se han estudiado distintos tipos de aceros utilizados comercialmente en moldes de inyeccion de polimeros y materiales compuestos, seleccionando las condiciones de operacion para determinar la variacion de la rugosidad superficial del acero en funcion del material inyectado, del numero de operaciones sucesivas de inyeccion y de la orientacion del flujo de inyeccion, mediante tecnicas de perfilometria optica y microscopia electronica de barrido. Ademas del dano superficial sufrido por el acero con el numero de piezas inyectadas, tambien se ha determinado la evolucion de la rugosidad superficial de los materiales inyectados, polibutilentereftalato (PBT) puro y materiales compuestos derivados de PBT por adicion de un 20 o un 50% en peso de fibra de vidrio. En el caso de las piezas inyectadas, se ha caracterizado su microestructura en funcion del flujo de inyeccion y de la densidad de fibra, se han determinado sus propiedades termicas y dinamico-mecanicas, asi como la variacion de la rugosidad superficial de las piezas inyectadas con el numero de operaciones de inyeccion y con la geometria de las distintas secciones de las piezas. Finalmente, se ha evaluado la resistencia a la abrasion de PBT reforzado con un 50% de fibra, en funcion del numero de piezas inyectadas y de la direccion de rayado con respecto a la orientacion del flujo de inyeccion.

Martinez Mateo, Isidoro Jose

365

Nanoparticulas basadas en complejos de Fe(II) con transicion de espin: sintesis, caracterizacion y aplicaciones en electronica molecular  

NASA Astrophysics Data System (ADS)

Esta tesis doctoral esta organizada en 5 capitulos y esta destinada al estudio de sistemas de Fe (II) que presentan el fenomeno de la transicion de espin a escala nanometrica. El capitulo 1 contiene una introduccion general sobre materiales moleculares multifuncionales, destacando aquellos ejemplos mas importantes. Por otro lado, se explicara el fenomeno de la transicion de espin, tratando aspectos conceptuales, los antecedentes mas importantes y la situacion actual. En el capitulo 2 se describen los diferentes procesos existentes para la obtencion de diferentes tipos de nanoparticulas. Ademas, se presenta la sintesis y caracterizacion de nanoparticulas del polimero de coordinacion unidimensional [Fe(Htrz)2(trz)]BF4, obtenidas mediante el metodo de micelas inversas. Estas nanoparticulas, con una estrecha distribucion de tamanos centrada alrededor de los 11 nm, presentan una transicion de espin muy abrupta, con un ancho ciclo de histeresis termica de unos 40K. En el capitulo 3 se describe el proceso de modificacion del tamano de las nanoparticulas descritas en el capitulo anterior, llevado a cabo variando la proporcion de surfactante/H2O en el medio. Ademas, con el objetivo de modificar las propiedades magneticas de las nanoparticulas obtenidas en el capitulo 2, se lleva a cabo la sintesis de nanoparticulas de polimeros de la misma familia del [Fe(Htrz)2(trz)]BF4. En concreto se sintetizaron 3 nuevos tipos de nanoparticulas basadas en el polimero [Fe(Htrz)1-x(NH2trz)x](ClO4)2, siendo x = 0.05, 0.15 y 0.3, en cada caso. Estas nanoparticulas siguen presentando una estrecha distribucion de tamanos y una transicion de espin muy abrupta y con un ancho ciclo de histeresis. Ademas, se observa que este ciclo se desplaza a temperaturas mas proximas a la temperatura ambiente a medida que se aumenta el porcentaje de 4-amino-1, 2, 4- triazol en la muestra. Pero al mismo tiempo se produce una disminucion de la anchura de este ciclo. Por ultimo, en este capitulo se presenta la sintesis de otro nuevo tipo de nanoparticulas, obtenidas a partir de otro polimero de la misma familia, el [FeO8ZnO2(Htrz)3](BF4). Estas nanoparticulas se sintetizaron con el objetivo de estudiar el efecto de la dilucion del metal en la muestra. Como resultado se obtuvieron nanoparticulas que tambien presentan una estrecha distribucion de tamanos pero en este caso la transicion de espin no es tan abrupta como en los casos anteriores. Aunque sigue presentando un ciclo de histeresis termica bastante ancho y a temperaturas proximas a la temperatura ambiente. En el capitulo 4 se describiran las estrategias que se han seguido para mejorar la estabilidad y afinidad sobre diferentes sustratos de las nanoparticulas sintetizadas en el capitulo 2. Tambien se hablara de los intentos realizados parar depositarlas en superficies y embeberlas en diferentes matrices organicas e inorganicas. En el capitulo 5 presentaremos la obtencion de un interruptor molecular realizado poniendo en contacto nanoparticulas individuales sintetizadas en el capitulo 2, con unos electrodos separados varios nanometros. Este dispositivo exhibe "switching" y efecto memoria a temperaturas proximas a la temperatura ambiente como consecuencia de la biestabilidad intrinseca de las nanoparticulas. Ademas demostraremos que el estado magnetico de estas nanoparticulas puede ser controlado electricamente, ya que la transicion de espin en este nanodispositivo molecular puede ser inducida simplemente aplicando un voltaje, lo que puede ser de gran interes para la electronica molecular.

Monrabal Capilla, Maria

366

El seminario consta de dos partes independientes: Una primera parte o Seminario terico con el ttulo Comprendiendo elTDA-H y una segunda  

E-print Network

realizará de manera práctica, tutorizada por un profesional en ejercicio especialista en TDAH con el título.La realización de ambos,llevará a la inclu- sión en un grupo de colaboradores con formación específica enTDAH: · AnalizarlarealidaddelossujetosconTDAH,desdesuprimera infancia hasta la entrada en la edad adulta

Escolano, Francisco

367

Influence of parameter values and variances and algorithm architecture in ConsExpo model on modeled exposures.  

PubMed

This study evaluated the influence of parameter values and variances and model architecture on modeled exposures, and identified important data gaps that influence lack-of-knowledge-related uncertainty, using Consexpo 4.1 as an illustrative case study. Understanding the influential determinants in exposure estimates enables more informed and appropriate use of this model and the resulting exposure estimates. In exploring the influence of parameter placement in an algorithm and of the values and variances chosen to characterize the parameters within ConsExpo, "sensitive" and "important" parameters were identified: product amount, weight fraction, exposure duration, exposure time, and ventilation rate were deemed "important," or "always sensitive." With this awareness, exposure assessors can strategically focus on acquiring the most robust estimates for these parameters. ConsExpo relies predominantly on three algorithms to assess the default scenarios: inhalation vapors evaporation equation using the Langmuir mass transfer, the dermal instant application with diffusion through the skin, and the oral ingestion by direct uptake algorithm. These algorithms, which do not necessarily render health conservative estimates, account for 87, 89 and 59% of the inhalation, dermal and oral default scenario assessments,respectively, according them greater influence relative to the less frequently used algorithms. Default data provided in ConsExpo may be useful to initiate assessments, but are insufficient for determining exposure acceptability or setting policy, as parameters defined by highly uncertain values produce biased estimates that may not be health conservative. Furthermore, this lack-of-knowledge uncertainty makes the magnitude of this bias uncertain. Significant data gaps persist for product amount, exposure time, and exposure duration. These "important" parameters exert influence in requiring broad values and variances to account for their uncertainty. Prioritizing them for research will not only help fill a large and influential knowledge gap, but also lead to more accurate assessments and thus refine the studies informing policy decisions. PMID:24283337

Arnold, Susan F; Ramachandran, Gurumurthy

2014-01-01

368

Pros and Cons of Using Arrays of Small Antennas Versus Large Single Dish Antennas for the Deep Space Network  

NASA Technical Reports Server (NTRS)

This paper briefly describes pros and cons of using arrays of small antennas instead of large single dish antennas for spacecraft telemetry, command, and tracking (TT and C) - communications and navigation (C and N) - and science support that the Deep Space Network (DSN) normally provides. It considers functionality and performance aspects, mainly for TT and C, though it also considers science. It only briefly comments on the cost aspects that seem to favor arrays of small antennas over large single antennas, at least for receiving (downlinks).

Bagri, Durgadas S.

2009-01-01

369

Dinámica y frecuencias características de una protuberancia solar observada con los instrumentos SUMER y CDS/SOHO  

NASA Astrophysics Data System (ADS)

La estructura de la protuberancia estudiada puede dividirse en cuatro regiones. A partir del análisis de las imágenes del CDS y los espectros del SUMER utilizando técnicas de multiresolución con Wavelets se obtuvieron las frecuencias y velocidades relativas de cada una de las regiones. Se observan frecuencias características del orden de los 5 min y otras de largo período. Se obtuvo una fuerte anticorrelación entre las intensidades y las velocidades Doppler. La presencia de las oscilaciones de 5 min en todas las regiones sugieren el acoplamiento entre la estructura cromosférica y la protuberancia.

Rovira, M.; Costa, A.; Bocchialini, K.

370

Modelo de accesibilidad de conceptos matematicos aplicados en el curso de Astronomia Descriptiva para estudiantes con impedimentos visuales en la UPR  

NASA Astrophysics Data System (ADS)

Este estudio utiliza metodologia de investigacion cualitativa, con el proposito de describir, analizar y evaluar los procesos de diseno y desarrollo de un modelo de accesibilidad que consiste en estrategias de ensenanza de las matematicas para estudiantes con impedimentos visuales matriculados en el curso de Astronomia Descriptiva en la UPR. Se utilizaron las siguientes estrategias para recopilar la informacion, 1) reflexiones de la investigadora en el proceso de diseno y desarrollo de las lecciones adaptadas, que se registraron en un diario reflexivo. 2) entrevista semiestructurada luego de haber trabajado las lecciones de aprendizaje adaptadas con los participantes. 3) observaciones y notas de la investigadora del trabajo de los participantes. Para obtener la informacion de los participantes se obtuvo los permisos institucionales necesarios; se seleccionaron los participantes y se validaron los instrumentos; se realizo el desarrollo de las lecciones adaptadas con los participantes; y finalmente, se analizo la informacion obtenida. El diseno de las lecciones de aprendizaje adaptadas se hizo siguiendo las recomendaciones curriculares de los temas de matematicas aplicados en el curso de Astronomia Descriptiva realizado por la investigadora durante su semestre de internado. El testimonio de las voces de los participantes se obtuvo del proceso de desarrollo de las lecciones de aprendizaje adaptadas de temas seleccionados de conceptos matematicos requeridos en el curso de Astronomia Descriptiva y de la entrevista semiestructurada con los participantes, luego de haber trabajado las lecciones de aprendizaje. Para el desarrollo de las lecciones de aprendizaje, se utilizaron materiales tactiles adaptados, materiales tactiles disenados y materiales disponibles comercialmente. Los textos de las lecciones se imprimieron en tinta y en Braille. Se exhorta a disenar y desarrollar estrategias de ensenanza accesibles, considerando como recursos para evaluar su efectividad a personas con impedimentos visuales. El utilizar estrategias de aprendizaje accesibles de acuerdo a las necesidades individuales de los estudiantes, contribuye para que los estudiantes con impedimentos visuales descubran, exploren, investiguen y formulen sus propias conclusiones durante su proceso de aprendizaje.

Isidro Villamizar, Gloria Maria

371

Protective Effects of Astaxanthin on ConA-Induced Autoimmune Hepatitis by the JNK/p-JNK Pathway-Mediated Inhibition of Autophagy and Apoptosis  

PubMed Central

Objective Astaxanthin, a potent antioxidant, exhibits a wide range of biological activities, including antioxidant, atherosclerosis and antitumor activities. However, its effect on concanavalin A (ConA)-induced autoimmune hepatitis remains unclear. The aim of this study was to investigate the protective effects of astaxanthin on ConA-induced hepatitis in mice, and to elucidate the mechanisms of regulation. Materials and Methods Autoimmune hepatitis was induced in in Balb/C mice using ConA (25 mg/kg), and astaxanthin was orally administered daily at two doses (20 mg/kg and 40 mg/kg) for 14 days before ConA injection. Levels of serum liver enzymes and the histopathology of inflammatory cytokines and other maker proteins were determined at three time points (2, 8 and 24 h). Primary hepatocytes were pretreated with astaxanthin (80 ?M) in vitro 24 h before stimulation with TNF-? (10 ng/ml). The apoptosis rate and related protein expression were determined 24 h after the administration of TNF-?. Results Astaxanthin attenuated serum liver enzymes and pathological damage by reducing the release of inflammatory factors. It performed anti-apoptotic effects via the descending phosphorylation of Bcl-2 through the down-regulation of the JNK/p-JNK pathway. Conclusion This research firstly expounded that astaxanthin reduced immune liver injury in ConA-induced autoimmune hepatitis. The mode of action appears to be downregulation of JNK/p-JNK-mediated apoptosis and autophagy. PMID:25761053

Liu, Tong; Wang, Junshan; Dai, Weiqi; Wang, Fan; Zheng, Yuanyuan; Chen, Kan; Li, Sainan; Abudumijiti, Huerxidan; Zhou, Zheng; Wang, Jianrong; Lu, Wenxia; Zhu, Rong; Yang, Jing; Zhang, Huawei; Yin, Qin; Wang, Chengfen; Zhou, Yuqing; Lu, Jie; Zhou, Yingqun; Guo, Chuanyong

2015-01-01

372

ON EFFECT OF HAZARD MAP ON CONS CIOUSNESS OF FLOOD DISASTER PREVENSION OF RESIDENTS WHO EXPERIENCED FLOOD RECENTLY  

NASA Astrophysics Data System (ADS)

In this paper, the effect of the flood hazard map distributed to the residents who experienced flood disasters recently and an effective method for improving consciousness of flood di saster prevention are discussed. The questionnaire surveys were conducted on the residents living in the middle basin of the Nishiki River, Iwakuni city, Yamaguchi Prefecture, before and after the distribution of the hazard map. It is found from this investigation that "knowledge", "att achment", and "crisis", are the main factors in the psychological process related to the flood prevention behavior. The effect of the distribution of the hazard map is judged from the probability of the flood prevention behavior. In addition, it is also found that "knowledge", "flood experiment of T0514", "crisis", "eff ectiveness", "load", and "easy reading of the hazard map", are keys to improve the cons ciousness of flood di saster prevention.

Asai, Koji; Koga, Syota; Sakakibara, Hiroyuki

373

Concepciones Alternativas de "Fotosintesis" en estudiantes Universitarios del curso basico de Biologia y posibles correcciones con el Modelo Educativo MODEF  

NASA Astrophysics Data System (ADS)

Concepciones Alternativas de Fotosíntesis en estudiantes Universitariosdel curso básico de Biología y posibles correcciones con el Modelo Educativo MODEF El modelo educativo para la enseñanza de Fotosíntesis (MODEF) se implantó para trabajar el problema de las concepciones alternativas (CA) en un curso de Biología General. Se evaluaron los resultados en cuanto al logro del aprendizaje significativo. La pregunta central de la investigación fue: ¿Cómo aporta el modelo educativo en la didáctica y comprensión del tema de fotosíntesis? Se efectuó una investigación acción con una fase cuantitativa y una cualitativa. Para la fase cuantitativa se elaboró una prueba para determinar las concepciones alternativas, se validó y se sometió a los estudiantes que participaron en el estudio antes y después de ofrecer la unidad de metabolismo celular. Los participantes eran estudiantes de primer año de la Universidad de Puerto Rico en Bayamón (UPRB). Se llevó a cabo un análisis de consistencia interna de la prueba mediante el método Alfa de Cronbach. Se analizaron las contestaciones a cada pregunta mediante la prueba de Ji cuadrado de contingencia, se efectuó la prueba de t y el coeficiente r de Pearson. La fase cualitativa incluyó la observación participativa de la investigadora- profesora, las reflexiones de los estudiantes y la información de las entrevistas semi-estructuradas que se realizaron a tres estudiantes del curso. El análisis se llevó a cabo mediante el Modelo de Wolcott. Se trabajaron diez CA de las cuales siete fueron corregidas mediante el Modelo MODEF. Las actividades más importantes para el proceso de aprendizaje incluyeron el trabajo de investigación o búsqueda de información para hacer una presentación digital, la elaboración de tablas, los mapas de conceptos, el uso de visuales o videos y las analogías para explicar conceptos o procesos. En conclusión: se recomienda el uso del Modelo MODEF para la discusión del tema de Fotosíntesis a base de los resultados cuantitativos y cualitativos de esta investigación. El Comité Institucional para la Protección de los Seres Humanos en la Investigación (CIPSHI) autorizó el estudio.

De Jesus Roman, Sandra

374

Intraspecific alkaloid variation in ladybird eggs and its effects on con- and hetero-specific intraguild predators.  

PubMed

Egg predation and cannibalism are common phenomena in predatory ladybirds despite the presence of defensive alkaloids. Consumption of heterospecific eggs negatively affects survivorship and development; however, intraspecific variation in quantities of alkaloids and post-ingestion responses to con- and hetero-specific alkaloids, are not well understood. We examined variation in the quantity of alkaloids in eggs of Harmonia axyridis (Pallas), Coccinella septempunctata L., and Hippodamia convergens (Guérin) using gas chromatography-mass spectrometry, and show a link between heterospecific alkaloids and their toxicity and/or costs by feeding high and low alkaloid eggs to first instar H. axyridis and C. septempunctata. The repeatability of alkaloid measurements in eggs in an egg cluster was high; however, the amount of alkaloids varied significantly between egg clutches within and among females. This variation affected egg consumption by C. septempunctata when fed H. axyridis eggs. Harmonia axyridis accumulated their own alkaloid by cannibalism and synthesized it de novo, but C. septempunctata lost some portion of the consumed conspecific alkaloids. Both species lost most of the consumed heterospecific alkaloids, but C. septempunctata died within 3 days. Most H. axyridis survived to the second instar, but C. septempunctata alkaloids led to a significant reduction in weight gain compared to an aphid control. In addition, ingestion of high alkaloid C. septempunctata extended development of H. axyridis compared to the aphid control or conspecific eggs. Harmonia axyridis had greater abilities to process ingested con- and hetero-specific alkaloids compared with C. septempunctata, which may, in part, explain their interspecific interactions in nature. PMID:20049478

Kajita, Yukie; Obrycki, J J; Sloggett, J J; Haynes, K F

2010-06-01

375

Nitrogen oxides and carbon chain oxides formed after ion irradiation of CO:N2 ice mixtures  

NASA Astrophysics Data System (ADS)

Context. High CO depletion as well as depletion of N-bearing species is observed in dense pre-stellar cores. It is generally accepted that depleted species freeze out onto dust grains to form icy mantles and that these ices suffer energetic processing due to cosmic ion irradiation and ion-induced UV photons. Aims: The aim of this work is to study the chemical and structural effects induced by ion irradiation on different CO:N2 mixtures at low temperature (16 K) to simulate the effects of cosmic ion irradiation of icy mantles. Methods: Different CO:N2 mixtures and pure CO and pure N2 were irradiated with 200 keV H+ at 16 K. Infrared transmittance spectra of the samples were obtained in situ before and after irradiation. The samples were warmed up and spectra were taken at different temperatures. The residues left over on the substrate at room temperature were analysed ex situ by micro Raman spectroscopy. Results: Several new absorption features are present in the infrared spectra after irradiation, indicating that new species are formed. The most abundant are nitrogen oxides (such as NO, NO2 and N2O), carbon chain oxides (such as C2O, C3O and C3O2), carbon chains (such as C3 and C6), O3 and N3. A refractory residue is also formed after ion irradiation and is clearly detected by Raman spectroscopy. Conclusions: We suggest that carbon chains and nitrogen oxides observed in the gas phase towards star-forming regions are formed in the solid phase after cosmic ion irradiation of icy grain mantles and are released into the gas phase after desorption of grain mantles. We expect that the Atacama Large Millimeter/submillimeter Array (ALMA), thanks to its high sensitivity and resolution, will increase the number of nitrogen oxides and carbon chain oxides detected towards star-forming regions.

Sicilia, D.; Ioppolo, S.; Vindigni, T.; Baratta, G. A.; Palumbo, M. E.

2012-07-01

376

What's new with manure: long term  

E-print Network

A 2809 N M W PS P2O 5 1998-2008 P2O 5 A 2809P2O 5 M W PS K 2O 1998-2008 K 2O A 2809 K 2O M W P S lbs/ton lbs/1000gal #12;Comparison of liquid swine manure summary results with book values 0 5 10 15 20 25 30O A 2809 K2O M W PS Swine-finish (indoor) Swine-finish (outdoor) Swine (farrow-nursery) #12

Balser, Teri C.

377

Crystallization and microstructure of Li 2O–Al 2O 3–SiO 2 glass containing complex nucleating agent  

Microsoft Academic Search

The crystallization and microstructure of Li2O–Al2O3–SiO2 (LAS) glass ceramic with complex nucleating agents (TiO2+ZrO2+P2O5+\\/or F?) are investigated by differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the effects of P2O5 and F? on the crystallization of LAS glass are also analyzed. The introduction of both P2O5 and F? promotes the crystallization of LAS glass by

Xingzhong Guo; Hui Yang; Chen Han; Fangfang Song

2006-01-01

378

Lectin from Canavalia brasiliensis (ConBr) protects hippocampal slices against glutamate neurotoxicity in a manner dependent of PI3K/Akt pathway.  

PubMed

The excitotoxicity induced by excessive activation of the glutamatergic neurotransmission pathway is involved in several neuropathologies. In this sense, molecules that prevent the release of glutamate or the excessive activation of its receptors can be useful in preventing the neuronal cell death observed in these diseases. Lectins are proteins capable of reversible binding to the carbohydrates in glycoconjugates, and some have been used in the study and purification of glutamate receptors. ConBr is a mannose/glucose-binding lectin purified from Canavalia brasiliensis seeds. In the present study, we aimed to evaluate the neuroprotective activity of ConBr against glutamate-induced excitotoxicity. Hippocampal slices were isolated from adult male mice and incubated for 6h in Krebs saline/DMEM buffer alone (control), in the presence of glutamate or glutamate plus ConBr. The phosphorylation of Akt and mitogen activated protein kinases (MAPKs) such as ERK1/2, p38(MAPK) and JNK1/2/3 was evaluated with western blotting. The results indicate that glutamate provoked a reduction in the hippocampal slice viability (-25%), diminished the phosphorylation of Akt and augmented p38(MAPK) and ERK1 phosphorylation. No changes were observed in the phosphorylation of JNK1/2/3 or ERK2. Notably, ConBr, through a mechanism dependent on carbohydrate interaction, prevented the reduction of cell viability and Akt phosphorylation induced by glutamate. Furthermore, in the presence of the PI3K inhibitor LY294002, ConBr was unable to reverse glutamate neurotoxicity. Taken together, our data suggest that the neuroprotective effect of ConBr against glutamate neurotoxicity requires oligosaccharide interaction and is dependent on the PI3K/Akt pathway. PMID:23454192

Jacques, Amanda V; Rieger, Débora K; Maestri, Mariana; Lopes, Mark W; Peres, Tanara V; Gonçalves, Filipe M; Pedro, Daniela Z; Tasca, Carla I; López, Manuela G; Egea, Javier; Nascimento, Kyria S; Cavada, Benildo S; Leal, Rodrigo B

2013-05-01

379

Inversor Resonante de Tres Elementos L-LC con Caracteristica Cortocircuitable para Aplicaciones de Calentamiento por Induccion  

NASA Astrophysics Data System (ADS)

Los generadores de calentamiento por induccion son puentes inversores con carga resonante, cuya mision es basicamente crear una corriente sinusoidal de gran amplitud sobre la "bobina de caldeo", que forma parte del tanque resonante. En el interior de esta bobina se introduce la pieza que se desea calentar. EI campo magnetico creado induce corrientes superficiales (corrientes de Foucault) sobre la pieza, que producen su calentamiento. Los tanques resonantes (tambien llamados osciladores) utilizados en la actualidad son el resonante serie y el resonante paralelo. Aunque ya desde hace algun tiempo se vienen construyendo generadores de alta potencia basados en estos dos osciladores, el exito nunca ha. sido completo en ninguno de los dos casos. Tal y como se explica en la introduccion de esta memoria, los puentes inversores utilizados deben operar sobre una carga inductiva (corriente retrasada) para evitar el fenomeno de la recuperacion inversa de sus diodos y la consiguiente ruptura de los transistores. De la restriccion topologica anterior se deduce que el generador paralelo debe conmutar a frecuencias inferiores a la resonancia, y el serie a frecuencias superiores. A esta restriccion topologica hay que unir otra que es exclusiva del calentamiento por induccion: La corriente por la bobina de caldeo debe ser sinusoidal. De no ser asi, resultaria imposible disponer toda la potencia de calentamiento sobre la pieza en el espesor requerido por la aplicacion. Como consecuencia, los inversores no pueden operar por debajo de la frecuencia de resonancia del oscilador, pues en ese caso se amplifican los armonicos de orden superior de la tension/corriente de entrada situados sobre la resonancia, con la consiguiente distorsion de la corriente de salida. La conjuncion de las dos restricciones anteriores obligan al inversor paralelo a funcionar a la frecuencia de resonancia del oscilador. Esto imposibilita un control por variacion de frecuencia, regulandose la potencia desde la seccion de entrada mediante un mayor o menor aporte de corriente al puente. Como consecuencia, la seccion de entrada del paralelo, ya de por si mas voluminosa que lao del serie por el uso de grandes componentes magneticos (bobinas de filtro o de "alisamiento"), result a tambien mas complicada y costosa debido a la necesidad de ser implementada mediante rectificador controlado. Ademas, la regulacion que ofrece el rectificador es pobre, dada su baja frecuencia de conmutacion. En cambio, el circuito serie puede funcionar por encima de la resonancia manteniendo una secuencia de conmutacion sin riesgos de recuperacion inversa y con una corriente de salida practicamente sinusoidal, lo que permite un control de la potencia por variacion de frecuencia. Puesto que la tarea de regulacion se realiza desde el puente inversor, la regulacion resulta mucho mas eficaz y la seccion de entrada se puede implementar mediante un simple rectificador no controlado y un condensador de filtro. (Abstract shortened by UMI.).

Espi Huerta, Jose Miguel

380

Bolet´ in de la Asociaci´ on Matem´ atica Venezolana, Vol. IX, No. 2 (2002) 109 Billares. Modelos con Din´ amicas Ca´ oticas  

Microsoft Academic Search

Resumen Se exponen en forma sencilla las relaciones del modelo de los gases de Boltzmann y su Hip´ otesis Erg´ odica con la moderna Teor´ ia Erg´ odica. Se da una descripci´ on de la formulaci´ on matem´ atica de la Teor´ ia de Billares y sus consecuencias en el modelo de las bolas duras. 1I n troducci´ on En

381

iCons 3E Syllabus (NatSci389H) NatSci 389H (formerly 390IH) Team-oriented Lab Discovery  

E-print Network

energy conversion, energy storage, biomass energy, combinatorial energy design, capturing waste energy in Renewable Energy [iCons 3E] Syllabus Spring 2014 Course Vision This course involves student-driven, team-oriented laboratory projects focused on the interrelated principles of energy generation, conversion, storage

Auerbach, Scott M.

382

First-order equation worksheet Name: Problem 1. A container has the maximum capacity 100 L. Initially, 50 L of salt water (with con-  

E-print Network

also) [This is not our typical problem. Note that the water level is changing with time.] (1) Let QFirst-order equation worksheet Name: Problem 1. A container has the maximum capacity 100 L. Initially, 50 L of salt water (with con- centration 2g/L) is in the container. Then, salt water (with

Oh, Seungly

383

El embarazo en la mujer con enfermedad cardiaca congénita: enfoque para el cardiólogo Congenital heart disease in the pregnant woman: a guide for the cardiologist  

Microsoft Academic Search

La enfermedad cardiaca congénita es la forma más común de alteración estructural cardiaca que afecta a la mujer en edad reproductiva en los países en vía de desarrollo. En estas pacientes el embarazo se asocia con mayor riesgo tanto para la madre como para el feto. Se recomienda la consejería y una evaluación prenatal adecuada, para evaluar los riesgos e

Edgardo Vanegas; Juan K. Urrea

384

40 CFR 180.1213 - Coniothyrium minitans strain CON/M/91-08; exemption from the requirement of a tolerance.  

Code of Federal Regulations, 2012 CFR

...from the requirement of a tolerance. An exemption from the requirement of a tolerance is established for residues of the microbial pesticide Coniothyrium minitans strain CON/M/91- 08 when used in or on all food commodities. [66 FR 16874,...

2012-07-01

385

Synthesis of water-soluble Ag?Se QDs as a novel resonance Rayleigh scattering sensor for highly sensitive and selective ConA detection.  

PubMed

Ag2Se quantum dots (QDs) have attracted a lot of interest due to their potential applications in biosensing and bioimaging. A strategy is presented that involves coupling of selenium powder reduction with the binding of silver ions, and thioglycollic acid (TGA) and glycine as stabilizers to obtain ultrasmall Ag2Se QDs at 85 °C in aqueous solution. This strategy avoids high temperatures, high pressures and organic solvents so that water-soluble 3 nm Ag2Se QDs can be directly obtained. The conjugation of ConA to TGA stabilized Ag2Se QDs by hydrogen bonds leads to the adsorption of ConA to Ag2Se QDs and forms the aggregation and leads to the generation of resonance Rayleigh scattering (RRS) as a readout signal for the sensing events. The reaction mechanism of Ag2Se QD RRS enhancement is studied in this work. The resulting RRS sensor enables the detection of ConA with limit of detection reaching 0.08 ?g mL(-1) concentration in a wide linear range from 0.27 ?g mL(-1) to 35 ?g mL(-1). The recovery of spiked ConA in human serum samples ranges from 94% to 106%. The relative standard deviation (RSD) for eleven replicate detections is 3.6%. Our results correlate many important experimental observations and will fuel the further growth of this field. PMID:24957549

Yan, Shuguang; Zhang, Lichun; Tang, Yurong; Lv, Yi

2014-09-01

386

Este encuentro internacional pretende proponer, a nivel de Europa occidental, un debate sobre cuestiones relacionadas con la arquitectura funeraria y la  

E-print Network

cuestiones relacionadas con la arquitectura funeraria y la gestión de los conjuntos sepulcrales-14 ARQUITECTURAS FUNERARIAS Y MEMORIA: LA GESTIÓN DE LAS NECRÓPOLIS EN EUROPA OCCIDENTAL(SIGLOS X-III a.C.) ARQUITECTURAS FUNERARIAS Y MEMORIA: LA GESTIÓN DE LAS NECRÓPOLIS EN EUROPA OCCIDENTAL (SIGLOS X-III a

Escolano, Francisco

387

Transformacin del campus para el desarrollo de un modelo social integral y su interaccin con el entorno territorial Tabla I. Descripcin de las actuaciones del proyecto  

E-print Network

, promociones entre los estudiantes y presencia activa en los actos de graduación, newsletters, redes sociales yTransformación del campus para el desarrollo de un modelo social integral y su interacción con el colectivo de referencia en los ámbitos de ciencias sociales, de la comunicación y de la biomedicina

Geffner, Hector

388

iCons 2 Renewable Energy [NatSci 290IH (2) aka i2e] Spring 2013 Syllabus i2e Faculty Guides  

E-print Network

1 iCons 2 Renewable Energy [NatSci 290IH (2) aka i2e] ­ Spring 2013 Syllabus i2e Faculty Guides Objectives: Students learn to ... in the context of Renewable Energy problems. 1. ... write effectively Trip: Campus Heating and Power (CHP) Thursday Feb 9: Work on Energy Flow Diagram for UMass Amherst

Auerbach, Scott M.

389

Pure Appl. Chem., Vol. 82, No. 12, pp. 22472279, 2010. doi:10.1351/PAC-CON-10-09-04  

E-print Network

2247 Pure Appl. Chem., Vol. 82, No. 12, pp. 2247­2279, 2010. doi:10.1351/PAC-CON-10-09-04 © 2010 to the trans form once the UV source is removed. Although this thermal re-isomerization is slow, *Pure Appl

Martin, Jan M.L.

390

DESARROLLO DE HABILIDADES COGNITIVAS EN NIÑOS(AS) ORIENTADO EN LA METACOGNICION A TRAVES DE LA INTERACCION CON ROBOTS MOVILES EN AMBIENTES DE REALIDAD VIRTUAL  

Microsoft Academic Search

Resumen: Este trabajo es la presentación de un proceso de investigación que esta orientado en el uso de las herramientas tecnológicas, especialmente en el manejo con robots móviles en ambientes virtuales, para estimular el desarrollo de habilidades cognitivas en los estudiantes desde temprana edad, retroalimentándose en modelos pedagógicos como el Constructivismo, la Heurística y la Metacogniciòn, este último, el espacio

Maria E. Pérez Mantilla; Grupo de Investigación

391

In a complex and all too often tragic world, it is useful to con-sider some comments from a great statesman as he guided his  

E-print Network

In a complex and all too often tragic world, it is useful to con- sider some comments from a great. My youth was also a time of war, of intense global competition, and of terrible weapons of mankind. My generation didn't do too badly. We defeated Communism without a nuclear war. We helped lead

Bieber, Michael

392

Basi di Dati, 20/12/2004, secondo compitino, compito A 1) Si consideri lo schema relazionale R(A,B,C,D,E) con le seguenti DF  

E-print Network

+ =BD. Applico l'algoritmo visto a lezione: BDA+ =BDACE BDC+ =BDCEA BDE+ =BDEAC Quindi le chiavi sono: BDA, BDC, BDE. b) Dire se lo schema è in 3FN, e in ogni caso decomporlo con l'algoritmo di sintesi

Ghelli, Giorgio

393

AC 2011-376: WIRELESS-INTEGRATED EMBEDDED REAL-TIME CON-TROL: A CASE STUDY IN ADOPTING RESOURCES FOR DEVELOP-  

E-print Network

AC 2011-376: WIRELESS-INTEGRATED EMBEDDED REAL-TIME CON- TROL: A CASE STUDY IN ADOPTING RESOURCES of Engineering. cAmerican Society for Engineering Education, 2011 #12;Wireless-Integrated Embedded Real in areas of control and embedded systems that weaves critical aspects of control systems design with real

394

Animaciones en 3D en tiempo real para las clases de ciencias e ingeniería: Ejemplos desarrollados con el módulo de programación VPython  

Microsoft Academic Search

RESUMEN: Se describe el uso del módulo de programación VPython para desarrollar animaciones en 3D por computadora para ilustrar temas de interés para las clases. Mostramos la utilidad del uso de animaciones para reforzar las presentaciones de materias como física y matemática, entre otras. Con tales presentaciones se puede innovar en el desarrollo de las clases de ciencias e ingeniería

Eduardo E. Rodríguez

395

BANDO PER IL RECLUTAMENTO DI UN RICERCATORE CON RAPPORTO DI LAVORO A TEMPO DETERMINATO COFINANZIATO DALLA REGIONE LAZIO -SAPIENZA UNIVERSIT DI ROMA -  

E-print Network

nella seduta del 20.07.2010 Vista la convenzione Sapienza ­ Università della Tuscia approvata con effetti dell'art. 3 della Convenzione Sapienza ­ Università della Tuscia, è indetta una procedura di, tuttavia, sulla base della convenzione tra Sapienza e l'Università della Tuscia, e del progetto citato

Guidoni, Leonardo

396

Geometria III, Problemas 5 Segundo semestre, 2009/10. (R) es el plano proyectivo con la estructura diferencial estudiada en clase.  

E-print Network

circunferencia con centro (t, t2 ) y radio t. Halle (t0)(f). (d) Si C0 es la circunferencia unidad centrada en el origen, escriba la matriz de dC0 en las bases de vectores coordenados de la carta global de M y la

Guijarro, Luis

397

Geometria III, Problemas 5 Primer semestre, 2010/11. (R) es el plano proyectivo con la estructura diferencial estudiada en clase.  

E-print Network

circunferencia con centro (t, t2 ) y radio t. Halle (t0)(f). (d) Si C0 es la circunferencia unidad centrada en el origen, escriba la matriz de dC0 en las bases de vectores coordenados de la carta global de M y la

Guijarro, Luis

398

Decreto n. 3625 IL RETTORE VISTA la nota e-mail datata 26 aprile 2011 con la quale il Prof.Giuseppe Visaggio,  

E-print Network

.Giuseppe Visaggio, Presidente del Daisy Net Scarl, ha trasmesso la convocazione dell'Assemblea dei Soci prevista per Competenza ICT - SUD". Articolo 1 -- DENOMINAZIONE I soci partecipanti a DAISY-Net forni- ranno ciascuno alla svolgimento delle attività previste dal presente statuto. DAISY-Net può ope- rare anche con terzi. Art, 13

Malerba, Donato

399

REAL-TIME WORKSHOP EN LA INVESTIGACIÓN : IMPLEMENTACIÓN DE DIVERSOS CONTROLADORES SOBRE UN SISTEMA SISO NO LINEAL Y SOBRE UN ROBOT MÓVIL CON VISIÓN ARTIFICIAL  

Microsoft Academic Search

Resumen En este artículo se muestra el trabajo que se está realizando en nuestra universidad en relación a Real-Time Workshop. Con el objetivo de disponer de un entorno que permita completar el proceso de análisis, diseño y implementación, se han desarrollado drivers específicos para tarjetas de adquisición de datos así como para permitir el acceso al puerto de comunicación serie

A. Oller; C. Pous; S. Esteva; J. Ll

400

arXiv:submit/0083985[cond-mat.supr-con]29Jul2010 Metastability in a nano-bridge based hysteretic DC-SQUID embedded in  

E-print Network

arXiv:submit/0083985[cond-mat.supr-con]29Jul2010 Metastability in a nano-bridge based hysteretic DC-SQUID study the metastable response of a highly hysteretic DC-SQUID made of a Niobium loop interrupted by two nano-bridges. We excite the SQUID with an alternating current and with direct magnetic flux, and find

Buks, Eyal

401

arXiv:submit/0276414[cond-mat.supr-con]4Jul2011 Fabrication of Nb/Al(AlOx)/Nb DC SQUID by focused ion beam sculpturing  

E-print Network

arXiv:submit/0276414[cond-mat.supr-con]4Jul2011 Fabrication of Nb/Al(AlOx)/Nb DC SQUID by focused interference devices (DC SQUID) were fabricated by three dimensional etching using fo- cused ion beam. Hysteretic and non-hysteretic DC SQUID with critical current ranging from 25 to 1100 µA were fabricated

Buks, Eyal

402

Synthesis, growth, structural, spectral, thermal, chemical etching, linear and nonlinear optical and mechanical studies of an organic single crystal 4-chloro 4-nitrostilbene (CONS): a potential NLO material.  

PubMed

4-Chloro 4-nitrostilbene (CONS) a new organic nonlinear optical material has been synthesized. Employing slow evaporation method, good optical quality single crystals (dimensions up to 6×2×3 mm(3)) have been grown using ethyl methyl ketone (EMK) as a solvent. The grown crystals have been subjected to various characterizations such as single crystal X-ray diffraction, powder XRD, Fourier Transform Infrared spectroscopy (FTIR), proton NMR, solid UV absorption, SHG studies. Single crystal X-ray diffraction reveals that the crystal system belongs to monoclinic with noncentrosymmetric space group P21. The UV-Vis absorption spectrum has been recorded and found that the cut off wavelength is 380 nm. Functional groups and the structure of the title compound have been confirmed by FTIR and (1)H NMR spectroscopic analyses respectively. Molecular mass of the CONS confirmed by the high resolution mass spectral analysis .The thermal behavior of the grown crystal has been studied by TG/DTA analysis and it shows the melting point is at 188.66 °C. Dislocations and growth pattern present in the grown crystal revealed by the etching study. The mechanical strength of the CONS crystal has been studied by Vicker's hardness measurement. The SHG efficiency of the grown crystal has been determined by Kurtz and Perry powder test which revealed that the CONS crystal (327 mV) has 15 times greater efficiency than that of KDP (21.7 mV). PMID:23624038

Dinakaran, Paul M; Kalainathan, S

2013-07-01

403

A TU PER TU CON L'ARTISTA Al Mart di Rovereto si aprono le selezioni per due volontari in qualit di  

E-print Network

A TU PER TU CON L'ARTISTA Al Mart di Rovereto si aprono le selezioni per due volontari in qualità di assistente d'artista. Richiesta la conoscenza della lingua spagnola. Il Mart offre la possibilità curriculum vitae aggiornato, dati personali e contatti telefonici e postali, a: - Indirizzo mail volontari@mart

404

IL DIPARTIMENTO DI ................ DELL'UNIVERSITA' DEGLI STUDI DI TORINO (di seguito chiamato DIPARTIMENTO), con sede legale in Torino, .........., C.F.: 80088230018, rappresentato  

E-print Network

Dipartimento in data ................ E ............................... (di seguito chiamato Ente), con sede. Art. 3 - Durata Il presente accordo entrerà in vigore alla data di stipula del presente atto ed avrà'uso. Tutte le spese derivanti dalla stipula della presente convenzione, comprese quelle di registrazione

Sproston, Jeremy

405

THE TOROIDAL EMBEDDING ARISING FROM AN IRRATIONAL FAN ABSTRACT. A toroidal embedding is defined which does not assume the fan con-  

E-print Network

THE TOROIDAL EMBEDDING ARISING FROM AN IRRATIONAL FAN T. J. FORD ABSTRACT. A toroidal embedding is defined which does not assume the fan con- sists of rational cones. For a rational fan, the toroidal embedding is the usual toric variety. If the fan is not rational, the toroidal embedding is in general

Ford, Timothy J.

406

Analysis of cancer risk and BRCA1 and BRCA2 mutation prevalence in the kConFab familial breast cancer resource  

PubMed Central

Introduction The Kathleen Cuningham Foundation Consortium for Research into Familial Breast Cancer (kConFab) is a multidisciplinary, collaborative framework for the investigation of familial breast cancer. Based in Australia, the primary aim of kConFab is to facilitate high-quality research by amassing a large and comprehensive resource of epidemiological and clinical data with biospecimens from individuals at high risk of breast and/or ovarian cancer, and from their close relatives. Methods Epidemiological, family history and lifestyle data, as well as biospecimens, are collected from multiple-case breast cancer families ascertained through family cancer clinics in Australia and New Zealand. We used the Tyrer-Cuzick algorithms to assess the prospective risk of breast cancer in women in the kConFab cohort who were unaffected with breast cancer at the time of enrolment in the study. Results Of kConFab's first 822 families, 518 families had multiple cases of female breast cancer alone, 239 had cases of female breast and ovarian cancer, 37 had cases of female and male breast cancer, and 14 had both ovarian cancer as well as male and female breast cancer. Data are currently held for 11,422 people and germline DNAs for 7,389. Among the 812 families with at least one germline sample collected, the mean number of germline DNA samples collected per family is nine. Of the 747 families that have undergone some form of mutation screening, 229 (31%) carry a pathogenic or splice-site mutation in BRCA1 or BRCA2. Germline DNAs and data are stored from 773 proven carriers of BRCA1 or BRCA1 mutations. kConFab's fresh tissue bank includes 253 specimens of breast or ovarian tissue – both normal and malignant – including 126 from carriers of BRCA1 or BRCA2 mutations. Conclusion These kConFab resources are available to researchers anywhere in the world, who may apply to kConFab for biospecimens and data for use in ethically approved, peer-reviewed projects. A high calculated risk from the Tyrer-Cuzick algorithms correlated closely with the subsequent occurrence of breast cancer in BRCA1 and BRCA2 mutation positive families, but this was less evident in families in which no pathogenic BRCA1 or BRCA2 mutation has been detected. PMID:16507150

Mann, Graham J; Thorne, Heather; Balleine, Rosemary L; Butow, Phyllis N; Clarke, Christine L; Edkins, Edward; Evans, Gerda M; Fereday, Sián; Haan, Eric; Gattas, Michael; Giles, Graham G; Goldblatt, Jack; Hopper, John L; Kirk, Judy; Leary, Jennifer A; Lindeman, Geoffrey; Niedermayr, Eveline; Phillips, Kelly-Anne; Picken, Sandra; Pupo, Gulietta M; Saunders, Christobel; Scott, Clare L; Spurdle, Amanda B; Suthers, Graeme; Tucker, Kathy; Chenevix-Trench, Georgia

2006-01-01

407

Air Traffic Management Technology Demonstration-1 Concept of Operations (ATD-1 ConOps), Version 2.0  

NASA Technical Reports Server (NTRS)

This document is an update to the operations and procedures envisioned for NASA s Air Traffic Management (ATM) Technology Demonstration #1 (ATD-1). The ATD-1 Concept of Operations (ConOps) integrates three NASA technologies to achieve high throughput, fuel-efficient arrival operations into busy terminal airspace. They are Traffic Management Advisor with Terminal Metering (TMA-TM) for precise time-based schedules to the runway and points within the terminal area, Controller-Managed Spacing (CMS) decision support tools for terminal controllers to better manage aircraft delay using speed control, and Flight deck Interval Management (FIM) avionics and flight crew procedures to conduct airborne spacing operations. The ATD-1 concept provides de-conflicted and efficient operations of multiple arrival streams of aircraft, passing through multiple merge points, from top-of-descent (TOD) to the Final Approach Fix. These arrival streams are Optimized Profile Descents (OPDs) from en route altitude to the runway, using primarily speed control to maintain separation and schedule. The ATD-1 project is currently addressing the challenges of integrating the three technologies, and their implantation into an operational environment. The ATD-1 goals include increasing the throughput of high-density airports, reducing controller workload, increasing efficiency of arrival operations and the frequency of trajectory-based operations, and promoting aircraft ADS-B equipage.

Baxley, Brian T.; Johnson, William C.; Swenson, Harry N.; Robinson, John E.; Prevot, Tom; Callantine, Todd J.; Scardina, John; Greene, Michael

2013-01-01

408

Evaluation of GO_CONS_GCF_2_TIM and GOCO01S Geopotential Models in Venezuela and Caribbean Region  

NASA Astrophysics Data System (ADS)

This paper shows two maps of the magnitude of the surface gravity vector (MSGV) of Venezuela and Caribbean region at 1:500.000 scale in the geographic window between the 0-20 north latitude and 74-58 western longitude (Fig. 1 and Fig. 2), that were generated from GOCE gravity gradients data provided by the European Space Agency (ESA). The maps that are showed come from the combined global gravity field model GOCO01s [GOCO Consortium., 2010] and from the satellite-only global gravity field model GO_CONS_GCF_2_TIM [Pail et al., 2010], both of 224 degree. The DEMs used for the evaluation of the MSGV are: Etopo2v2 [NGDC., 2006] and Etopo1 [Amante and Eakins, 2009] respectively. The data processing was done using: Shm2func [ICGEM., 2007]; Goce User Toolbox [ESA., 2009]; Gravsoft package [Tscherning et al., 1992] and Oasis Montaj (Geosoft). This research shows a review of observed gravity in the main geological provinces of the Venezuela and Caribbean region geography, revealing gravitational features important of the geological structures that are in Venezuelan and Caribbean subsurface.

Orihuela, N. D.; Garcia, A. D.; Tabare, T.; Scientific Team Of Venezuelan; Caribbean Crustal Study From Satellital Data

2010-12-01

409

Special funding schemes for innovative medical devices in French hospitals: the pros and cons of two different approaches.  

PubMed

Financing innovative medical devices is an important challenge for national health policy makers, and a crucial issue for hospitals. However, when innovative medical devices are launched on the European market there is generally little clinical evidence regarding both efficacy and safety, both because of the flaws in the European system for regulating such devices, and because they are at an early stage of development. To manage the uncertainty surrounding the reimbursement of innovation, several European countries have set up temporary funding schemes to generate evidence about the effectiveness of devices. This article explores two different French approaches to funding innovative in-hospital devices and collecting supplementary data: the coverage with evidence development (CED) scheme introduced under Article L. 165-1-1 of the French Social Security Code; and national programs for hospital-based research. We discuss pros and cons of both approaches in the light of CED policies in Germany and the UK. The CED policies for devices share common limitations. Thus, transparency of CED processes should be enhanced and decisions need to be made in a timely way. Finally, we think that closer collaboration between manufacturers, health authorities and hospitals is essential to make CED policies more operational. PMID:24794738

Martelli, Nicolas; van den Brink, Hélène

2014-07-01

410

Status and Progress of a Fault Current Limiting Hts Cable to BE Installed in the con EDISON Grid  

NASA Astrophysics Data System (ADS)

In the last decade, significant advances in the performance of second generation (2G) high temperature superconducting wire have made it suitable for commercially viable applications such as electric power cables and fault current limiters. Currently, the U.S. Department of Homeland Security is co-funding the design, development and demonstration of an inherently fault current limiting HTS cable under the Hydra project with American Superconductor and Consolidated Edison. The cable will be approximately 300 m long and is being designed to carry 96 MVA at a distribution level voltage of 13.8 kV. The underground cable will be installed and energized in New York City. The project is led by American Superconductor teamed with Con Edison, Ultera (Southwire and nkt cables joint venture), and Air Liquide. This paper describes the general goals, design criteria, status and progress of the project. Fault current limiting has already been demonstrated in 3 m prototype cables, and test results on a 25 m three-phase cable will be presented. An overview of the concept of a fault current limiting cable and the system advantages of this unique type of cable will be described.

Maguire, J.; Folts, D.; Yuan, J.; Henderson, N.; Lindsay, D.; Knoll, D.; Rey, C.; Duckworth, R.; Gouge, M.; Wolff, Z.; Kurtz, S.

2010-04-01

411

Entrevista con Vicente Leñero  

E-print Network

ingeniería, y yo era bueno para las matemáticas, pero andando el tiempo mis inquietudes eran siempre escribir, ¿no? Pero no pensé que para escribir alguien se pudiera dedicar a eso. En los años cuarenta, cincuenta eso no... no parecía ser un futuro muy... halagüeño. Enton ces yo estudié ingeniería. Finalmente terminé la carrera de ingeniero, pero en el ínterin le dediqué una buena parte al estudio de... yo quería escribir, siempre me costó mucho trabajo, aún todavía Stuart A. Day 19 me cuesta trabajo...

Day, Stuart A.

2004-01-01

412

Circumcision: Pros and cons  

PubMed Central

Circumcision is possibly the most frequently performed elective surgical procedure in men. It can simply be described as the excision of the preputium. There have been several studies about the association between circumcision and urinary tract infections (UTI). Many studies have demonstrated that the frequency of UTI increase in uncircumcised males, especially in the first year of life. This review discusses the embryology of the preputium, epidemiology, indications, complications and benefits of circumcision, as well as operation and anesthesiology techniques. It especially examines the association between UTI and circumcision and the importance of circumcision in congenital urinary system anomalies. In addition, this review examines the associations between circumcision and sexually transmitted diseases, including HIV, and the protective role of circumcision on penile cancer. PMID:20535279

Burgu, Berk; Aydogdu, Ozgu; Tangal, Semih; Soygur, Tarkan

2010-01-01

413

Filtro con capacidades conmutadas  

Microsoft Academic Search

Resumen: El ruido urbano es un factor de contaminación ambiental que puede p rovocar daños más o menos graves, permanentes o no , sobre e l sistema a uditivo h umano. Los parámetros que permiten estimar el nivel de ruido presente en un determinado ambiente, y en consecuencia el nivel de contaminación ambiental y el posible perjuicio que ese nivel

Daniel Crepaldo; María Isabel Schiavon

2000-01-01

414

IDENTIFICACIÓN CON LOS PERSONAJES  

Microsoft Academic Search

The identification with the characters is a mechanism that permits the audience experience from inside the narration, as a consequence of an empathe- tic reaction toward the protagonist. In the present arti- cle two empirical studies are included in which the identification with the characters is analyzed in rela- tion with media entertainment, particularly, with refe- rence to reception and

Juan José Igartua

415

Neo-Conned University  

ERIC Educational Resources Information Center

Censorship, says Australian political theorist John Keane (1991), can "echo within us, take up residence within ourselves, spying on us, a private amanuensis who reminds us never to go too far... It makes us zip our lips, tremble and think twice" (p. 39). It can also make us sick. The author states that this is her argument here: that,…

Jones, Andee

2014-01-01

416

EthicsConRep  

Cancer.gov

The authors also gratefully acknowledge the copy editing assistance of Leslie Alter, MPH and Steve Brown. The Ethical Force Program’s initiative on patient-centered communication is funded in part by the American Medical Association Foundation, The California Endowment, the Commonwealth Fund and the Connecticut Health Foundation.

417

urban ConAgraculture  

Microsoft Academic Search

Current pressures in today’s world caused me to investigate strategies of change in the organization of society to promote a more effi cient existence. Globalization, a movement characterized by the dissemination of economies, ethnicities, media, ideas, technologies, and production; has become today’s reality. The shift from imperialism to globalism has caused a decline in the power and importance of nation

Dale J Luebbert

2009-01-01

418

Adelante con animo  

E-print Network

A proposition of this thesis is that architecture is capable of conveying a sense of animation, movement and energy. These are elusive properties. Their perception perhaps emerges from the building's form or articulation ...

McCullough Maker, Kathleen Grace

1992-01-01

419

I1 piano regolatore di iina citt di circa 50.000 abitanti, in una zona pianeggiante di nuova espansione che fronteggia il mare e confina con una zona a verde pubblico, prevista una  

E-print Network

I1 piano regolatore di iina città di circa 50.000 abitanti, in una zona pianeggiante di nuova piano di recupero di un ambito urbano ricadente in un centro storico, con una rilevante presenza di candidato illustrerà la normativa di riferimento per la redazione del piano di recupero con particolare

Di Pillo, Gianni

420

40 CFR 60.243 - Monitoring of operations.  

Code of Federal Regulations, 2010 CFR

...provisions of this subpart shall maintain an accurate account of triple superphosphate in storage to permit the determination of the amount of equivalent P2 O5...244(c)(3), times the total mass of granular triple superphosphate...

2010-07-01

421

40 CFR 60.211 - Definitions.  

Code of Federal Regulations, 2012 CFR

...or greater P2 O5 content by weight for eventual consumption as a fertilizer. (b) Total fluorides means elemental fluorine and all fluoride compounds as measured by reference methods specified in § 60.214, or equivalent or alternative...

2012-07-01

422

40 CFR 60.211 - Definitions.  

Code of Federal Regulations, 2013 CFR

...or greater P2 O5 content by weight for eventual consumption as a fertilizer. (b) Total fluorides means elemental fluorine and all fluoride compounds as measured by reference methods specified in § 60.214, or equivalent or alternative...

2013-07-01

423

40 CFR 60.211 - Definitions.  

Code of Federal Regulations, 2014 CFR

...or greater P2 O5 content by weight for eventual consumption as a fertilizer. (b) Total fluorides means elemental fluorine and all fluoride compounds as measured by reference methods specified in § 60.214, or equivalent or alternative...

2014-07-01

424

40 CFR 60.211 - Definitions.  

Code of Federal Regulations, 2011 CFR

...or greater P2 O5 content by weight for eventual consumption as a fertilizer. (b) Total fluorides means elemental fluorine and all fluoride compounds as measured by reference methods specified in § 60.214, or equivalent or alternative...

2011-07-01

425

An inevitable wave of prescription drug monitoring programs in the context of prescription opioids: pros, cons and tensions  

PubMed Central

Background In an effort to control non-medical use and/or medical abuse of prescription drugs, particularly prescription opioids, electronic prescription drug monitoring programs (PDMP) have been introduced in North-American countries, Australia and some parts of Europe. Paradoxically, there are simultaneous pressures to increase opioid prescribing for the benefit of individual patients and to reduce it for the sake of public health, and this pressure warrants a delicate balance of appropriate therapeutic uses of these drugs with the risk of developing dependence. This article discusses pros and cons of PDMP in reducing diversion of prescription opioids, without hampering access to those medications for those with genuine needs, and highlights tensions around PDMP implementation. Discussion PDMPs may help alleviate diversion, over-prescription and fraudulent prescribing/dispensing; prompt drug treatment referrals; avoid awkward drug urine test; and inform spatial changes in prescribing practices and help designing tailored interventions. Fear of legal retribution, privacy and data security, potential confusion about addiction and pseudo-addiction, and potential undue pressure of detecting misuse/diversion - are the major problems. There are tensions about unintended consequence of excessive regulatory enforcements, corresponding collateral damages particularly about inadequate prescribing for patients with genuine needs, and mandatory consultation requirements of PDMP. Summary In this era of information technology PDMP is likely to flourish and remain with us for a long time. A clear standard of practice against which physicians’ care will be judged may expedite the utilisation of PDMP. In addition, adequate training on addiction and pain management along with public awareness, point-of-supply data entry from pharmacy, point-of-care real-time access to data, increasing access to addiction treatment and appropriate regulatory enforcement preferably through healthcare administration, together, may help remove barriers to PDMP use. PMID:25127880

2014-01-01

426

Esplorazione Della Terra Incognita Della Fisica Nucleare: Nuclei Con Alone, Nuclei "A Grappoli", Nuclei Borromeani e Altre Stranezze Esotiche!  

E-print Network

English: If the current status of theoretical and experimental knowledge in Nuclear Physics could be reduced to a geographical chart or a planisphere, then our epoch would be in some respect comparable to the end of the Medieval age and in other to the beginning of the Reinassance: epochs in which, together with the consolidated knowledge of the Old World, there have been great and revolutionary expeditions as the discovery of America or the periplus of Cape of Good Hope, explorations aimed at reaching the limits that, along the centuries, have lead to more and more engaging scientific discoveries in more and more far away lands, ending only in the twentieth century with the complete mapping of all the continents. Nuclear Physics is living an analogous adventure on the plane of contrast... - Italian: Se lo stato attuale delle conoscenze teoriche e sperimentali della Fisica Nucleare si potesse ridurre a una carta geografica o un mappamondo, allora la nostra epoca si potrebbe paragonare per certi versi alla fine del Medioevo e per altri al Rinascimento: epoche in cui, accanto alla conoscenza consolidata del Vecchio mondo, ci furono grandi e rivoluzionarie spedizioni come la scoperta dell'America o il periplo del Capo di Buona Speranza, esplorazioni geografiche volte al raggiungimento dei limiti che, nel corso dei secoli, hanno portato a scoperte scientifiche sempre pi\\`u avvincenti in terre sempre pi\\`u lontane, culminate solo nel ventesimo secolo con la completa mappatura di tutte le terre emerse. La Fisica Nucleare sta vivendo un'avventura analoga sul piano della contrapposizione tra la conoscenza acquisita sui nuclei stabili e la scoperta delle sorprendenti propriet\\`a esotiche dei nuclei instabili, pi\\`u difficili da produrre, da studiare e da comprendere.

Lorenzo Fortunato

2011-04-04

427

1480 nm two-cascaded highly efficient Raman fiber laser  

Microsoft Academic Search

Summary form only given. Lasers based on high P2O5-doped fibers can potentially have a higher efficiency than Raman fiber lasers (RFL) based on standard Ge-doped fibers. An increase of phosphorus content in the fiber core gives rise to an increase of the Raman gain coefficient. Despite a rise of optical losses, heavily P2O5-doped fibers enable one to develop extremely efficient

I. A. Bufetov; M. M. Bubnov; Y. V. Larionov; M. A. Melkoumov; A. A. Rybaltovsky; S. L. Semjonov; E. M. Dianov

2002-01-01

428

Models of basalt petrogenesis: Lower Keweenawan diabase dikes and middle Keweenawan Portage Lake Lavas, upper Michigan  

Microsoft Academic Search

Lower Keweenawan diabase dikes from Marquette-Baraga Counties, and middle Keweenawan Portage Lake Lavas from upper Michigan, can each be subdivided into two chemically distinct groups: a low TiO2-P2O5 group characterized by higher A12O3 content, higher Mg ratio, and lower total Fe and REE abundances than a high TiO2-P2O5 group. Both groups, which are indistinguishable in the field, are enriched in

John T. Wilband; Pipob Wasuwanich

1981-01-01

429

Version 3.0 January 2013 Nutrient Balance Sheet  

E-print Network

was used to develop the planned manure rate. No other phosphorus sources (manure and fertilizer) may Starter/Other Fertilizer (lb/A) Nutrient Balance @ Planned Rate (lb/A) 1 Notes (check) N P2O5 K2O N P2O5 K are based on crop removal (Row A) and should not be used to determine additional fertilizer needs. 2

Guiltinan, Mark

430

Extraction of Am(III) from different acid media by di-2-ethyl hexyl phosphoric acid containing phosphorous pentoxide  

Microsoft Academic Search

The extraction of Am(III) from nitric, hydrochloric, oxalic, phosphoric and hydrofluoric acids was studied using 0.4F di-2-ethyl hexyl phosphoric acid (HDEHP) containing 0.1M phosphorous pentoxide (P2O5) in dodecane\\/xylene. The extraction with pure 0.4F HDEHP was found to be negligible from all the media studied. However, the presence of a small amount of P2O5 in it increased the extraction substantially. The

M. M. Charyulu; D. G. Phal; D. M. Noronha; V. V. Ramakrishna; V. Venugopal

2001-01-01

431

Gender Specific Differences in the Pros and Cons of Smoking among Current Smokers in Eastern Kentucky: Implications for Future Smoking Cessation Interventions  

PubMed Central

This study investigated gender differences in the perceived “pros” and “cons” of smoking using the constructs of decisional balance (DB) and stage of change from the Transtheoretical Model. The population distribution for stage of change among a population-based, cross-sectional survey of 155 current smokers over 40 years was: precontemplation (22.6%), contemplation (41.9%), preparation (35.5%). Results of stepwise regression models indicated significant gender differences in DB were in the preparation stage of change; scores on the DB measure increased 3.94 points (95% CI: 1.94, 5.93) for male smokers. Interventions targeting the “pros” and “cons” of smoking may need to be gender specific. PMID:19190354

Hazen, Dana A.; Mannino, David M.; Clayton, Richard

2008-01-01

432

The School of Ocean and Earth Science and Technology (SOEST) at the University of Hawai`i at Manoa (UHM) has con-  

E-print Network

The School of Ocean and Earth Science and Technology (SOEST) at the University of Hawai`i at M¯anoa (UHM) has con- tracted with Deep Ocean Exploration and Research (DOER) Marine for the design(R/VKM) I n f o r m a t I o n S h e e t SOEST-DOER Marine H6000 RemotelyOperatedVehicle(ROV) SCHOOL OF OCEAN

433

reThiNKiNG The BoUNdaries The dUKe MBa--CroSS ConTInenT  

E-print Network

reThiNKiNG The BoUNdaries The dUKe MBa--CroSS ConTInenT #12;develoP GloBal iNsiGhT The duke MBa--cross continent program is designed to help full-time working professionals earn a world- class MBa while building, The duke MBa-- cross continent program builds more than global awareness; it provides the necessary real

Dolbow, John

434

Compito Comunicazioni Radiomobili: 27 Luglio Si consideri la connessione uplink di un sistema radiomobile con accesso multiplo al canale a divisione  

E-print Network

ogni utente trasmetta con potenza Ptx = 0.25 W, che le perdite nel canale siano uguali per tutti gli calcoli la potenza in trasmissione necessaria affinche' ogni utente raggiunga un Eb/I0 pari a 8 dB nell - P (i) rx + N0W × G(i) #12;2 dove Itot = M j=1 P (j) rx e' la potenza totale ricevuta dalla stazione

Abrardo, Andrea

435

Comparison between Subgenomic Replicons of Hepatitis C Virus Genotypes 2a (JFH-1) and 1b (Con1 NK5.1)  

Microsoft Academic Search

Although replicon systems for hepatitis C virus (HCV) recently developed have enabled the replication of HCV in cultured cells, limited genotypes are available for them. We have isolated HCV cDNA of genotype 2a (JFH-1 strain) from serum of a patient with fulminant hepatitis. A subgenomic replicon of JFH-1 was constructed and compared with the HCV replicon of genotype 1b (Con1

Michiko Miyamoto; Takanobu Kato; Tomoko Date; Masashi Mizokami; Takaji Wakita

2006-01-01

436

Dissection of the Intracellular Pathways in Hepatocytes Suggests a Role for Jun Kinase and IFN Regulatory Factor1 in Con A-Induced Liver Failure1  

Microsoft Academic Search

Con A administration results in dose-dependent immune-mediated liver injury. Cytokines are important to determine the outcome of liver failure in this model, and especially TNF-a and IFN-g directly contribute to hepatocyte damage. The intracellular pathways of these two cytokines, which eventually result in tissue destruction, are not well defined. Here we used anti-IFN-g Abs and adenoviral vectors that express molecules

Konrad Streetz; Bastian Fregien; Jorg Plumpe; Kerstin Korber; Stefan Kubicka; Stephan C. Bischoff; Michael P. Manns; Gisa Tiegs; Christian Trautwein

437

NIDO: Navegación e interacción con el usuario en el desarrollo de sistemas de información Web: Métodos, Técnicas y Herramientas TIC2003-00369  

Microsoft Academic Search

NIDO (Navegación e Interacción con el usuario en el Desarrollo de sistemas de Información Web: Métodos, Técnicas y Herramientas) is a research project with two main lines of research. The first one is to continue with the research developed in the coordinated projects MENHIR (TIC97-0593-C05-03) and DOLMEN (TIC2000-1673-C06-03), while the second one is related to the opening of new research

Jesús Torres

438

A review of the practice of sedation with inhalational anaesthetics in the intensive care unit with the AnaConDa® device  

PubMed Central

The intensive care unit (ICU) environment is often perceived to be hostile and frightening by patients due to unfamiliar surroundings coupled with presence of numerous personnel, monitors and other equipments as well as a loss of perception of time. Mechanical ventilation and multiple painful procedures that often need to be carried out in these critically ill patients add to their overall anxiety. Sedation is therefore required not only to allay the stress and anxiety, but also to allow for mechanical ventilation and other invasive therapeutic and diagnostic procedures to be performed. The conventional intravenous sedative agents used in ICUs suffer from problems of over sedation, tachyphylaxis, drug accumulation, organ specific elimination and often lead to patient agitation on withdrawal. All this tend to prolong the ventilatory as well as ICU and hospital discharge time, which increase the risk for infection and add to the overall increase in morbidity, mortality and hospital costs. In 2005, the anaesthetic conserving device (AnaConDa®) was marketed for ICU sedation with volatile anaesthetic agents. A number of trials have shown the effectiveness of using volatile anaesthetic agents for ICU sedation with the AnaConDa device. Compared with intravenous sedatives, use of volatile anaesthetic agents have resulted in shorter wake up and extubation time, lesser duration of mechanical ventilation and faster discharge from hospitals. This review shall focus on the benefits, technical pre-requisites and status of sedation with volatile anaesthetic agents in ICUs with the AnaConDa® device. PMID:23325934

Misra, Satyajeet; Koshy, Thomas

2012-01-01

439

Emerging and Legacy Contaminants in The Foodweb in The Lower Columbia River: USGS ConHab Project  

NASA Astrophysics Data System (ADS)

An interdisciplinary study, USGS Columbia River Contaminants and Habitat Characterization (ConHab) project, investigates transport pathways, chemical fate, and effects of polybrominated diphenyl ethers (PBDEs) and other endocrine disrupting chemicals (EDCs) in aquatic media and the foodweb in the lower Columbia River, Oregon and Washington. Polar organic chemical integrative samplers (POCIS) and semipermeable membrane devices (SPMDs) were co-deployed at each of 10 sites in 2008 to provide a measure of the dissolved concentrations of select PBDEs, chlorinated pesticides, and other EDCs. PBDE-47 was the most prevalent of the PBDEs detected. Numerous organochlorine pesticides, both banned and current-use, including hexachlorobenzene, pentachloroanisole, dichlorodiphenyltrichloroethane (DDT) and its degradates, chlorpyrifos, endosulfan, and the endosulfan degradation products, were measured at each site. EDCs commonly detected included a series of polycyclic aromatic hydrocarbons (PAHs), fragrances (galaxolide), pesticides (chlorpyrifos and atrazine), plasticizers (phthalates), and flame retardants (phosphates). The downstream sites tended to have the highest concentrations of contaminants in the lower Columbia River. In 2009 and 2010 passive samplers were deployed and resident largescale suckers (Catostomus macrocheilus) and surface bed sediments were collected at three of the original sites representing a gradient of exposure based on 2008 results. Brain, fillet, liver, stomach, and gonad tissues were analyzed. Chemical concentrations were highest in livers, followed by brain, stomach, gonad, and, lastly, fillet. Concentrations of halogenated compounds in tissue samples ranged from <1 to 400 ng g-1 wet tissue. PBDEs, organochlorine pesticides, DDT and its degradates, and polychlorinated biphenyls (PCBs) were detected at all sites in nearly all organs tested. PBDE congeners most frequently detected and at the highest concentrations were PBDE-47 > PBDE-100 > PBDE-154 > PBDE-153. Concentrations in tissues and in sediments increased moving downstream from Skamania, WA to Columbia City, OR to Longview, WA. Preliminary biomarker results indicate that fish at the downstream sites experience greater stress relative to the upstream site based on gonad, kidney, spleen, and liver histopathology. These results support the hypothesis that contaminant concentrations in the environment correlate to bioaccumulation in the foodweb.

Nilsen, E. B.; Alvarez, D.; Counihan, T.; Elias, E.; Gelfenbaum, G. R.; Hardiman, J.; Jenkins, J.; Mesa, M.; Morace, J.; Patino, R.; Torres, L.; Waite, I.; Zaugg, S.

2012-12-01

440

Thermodynamic Measurement of Di-calcium Phosphate  

NASA Astrophysics Data System (ADS)

The thermodynamic properties of the CaO-P2O5 system are important to develop an effective refining process in the iron and steel industry. In this study, the thermodynamic properties of (CaO)2P2O5 were investigated because the properties are necessary to develop a new dephosphorization process. The vapor of gaseous phosphorus and phosphorus oxide in equilibrium with a mixture of (CaO)2P2O5 and (CaO)3P2O5 at 1373 K to 1498 K (1100 °C to 1225 °C) were detected directly as an ion current by double Knudsen cell mass spectrometry. Comparing the ion currents with those from a mixture of Al2O3P2O5 and Al2O3, which is used as a reference mixture in this study, the Gibbs energy change of the following reaction was calculated: 2{{CaO}}( {{s}} ) + {{ P}}2 ( {{g}} ) + 5/2{{O}}2 ( {{g}} ) = ( {{CaO}} )2 {{P}}2 {{O}}5 ( {{s}} ) Updelta G^{ circ } = - 2180000 + 590T( { ± 28000} ){{J}}.

Nagai, Takashi; Tanaka, Yusuke; Maeda, Masafumi

2011-08-01

441

Informe Anual a la Nación sobre el Estado del Cáncer, de 1975 a 2010, con una sección especial sobre la prevalencia de comorbilidad y su efecto en la supervivencia de personas con cáncer de pulmón, seno, próstata o colorrectal: preguntas y respuestas  

Cancer.gov

El Informe Anual a la Nación sobre el Estado del Cáncer (1975 a 2010), mostró un descenso más acelerado que en años anteriores de los índices de mortalidad por cáncer de pulmón. También contiene una sección especial que destaca los efectos significativos que tienen otras enfermedades en la supervivencia de pacientes con cáncer.

442

RISULTATI VALUTAZIONE TITOLI DEL CONCORSO PER L'ASSEGNAZIONE DI N.1 ASSEGNO DI RICERCA PROG. DI RICERCA N. 11.05 BANDITO CON D.R. N.2285 DEL 3.6.2013  

E-print Network

Pubblicazioni su riviste 6 Pubblicazioni su volumi 4 TOTALE 12 DOTT. CASSANO ANDREA: Dottorato di ricerca 10 disponibili, la Commissione decide di ammettere il candidato dott. Cassano Andrea, con punti 31

Malerba, Donato

443

Flight Deck Surface Trajectory-based Operations (STBO): Results of Piloted Simulations and Implications for Concepts of Operation (ConOps)  

NASA Technical Reports Server (NTRS)

The results offour piloted medium-fidelity simulations investigating flight deck surface trajectory-based operations (STBO) will be reviewed. In these flight deck STBO simulations, commercial transport pilots were given taxi clearances with time and/or speed components and required to taxi to the departing runway or an intermediate traffic intersection. Under a variety of concept of operations (ConOps) and flight deck information conditions, pilots' ability to taxi in compliance with the required time of arrival (RTA) at the designated airport location was measured. ConOps and flight deck information conditions explored included: Availability of taxi clearance speed and elapsed time information; Intermediate RTAs at intermediate time constraint points (e.g., intersection traffic flow points); STBO taxi clearances via ATC voice speed commands or datal ink; and, Availability of flight deck display algorithms to reduce STBO RTA error. Flight Deck Implications. Pilot RTA conformance for STBO clearances, in the form of ATC taxi clearances with associated speed requirements, was found to be relatively poor, unless the pilot is required to follow a precise speed and acceleration/deceleration profile. However, following such a precise speed profile results in inordinate head-down tracking of current ground speed, leading to potentially unsafe operations. Mitigating these results, and providing good taxi RTA performance without the associated safety issues, is a flight deck avionics or electronic flight bag (EFB) solution. Such a solution enables pilots to meet the taxi route RTA without moment-by-moment tracking of ground speed. An avionics or EFB "error-nulling" algorithm allows the pilot to view the STBO information when the pilot determines it is necessary and when workload alloys, thus enabling the pilot to spread his/her attention appropriately and strategically on aircraft separation airport navigation, and the many other flight deck tasks concurrently required. Surface Traffic Management (STM) System Implications. The data indicate a number of implications regarding specific parameters for ATC/STM algorithm development. Pilots have a tendency to arrive at RTA points early with slow required speeds, on time for moderate speeds, and late with faster required speeds. This implies that ATC/STM algorithms should operate with middle-range speeds, similar to that of non-STBO taxi performance. Route length has a related effect: Long taxi routes increase the earliness with slow speeds and the lateness with faster speeds. This is likely due to the" open-loop" nature of the task in which the speed error compounds over a longer time with longer routes. Results showed that this may be mitigated by imposing a small number oftime constraint points each with their own RTAs effectively tuming a long route into a series of shorter routes - and thus improving RTA performance. STBO ConOps Implications. Most important is the impact that these data have for NextGen STM system ConOps development. The results of these experiments imply that it is not reasonable to expect pilots to taxi under a "Full STBO" ConOps in which pilots are expected to be at a predictable (x,y) airport location for every time (t). An STBO ConOps with a small number of intermediate time constraint points and the departing runway, however, is feasible, but only with flight deck equipage enabling the use of a display similar to the "error-nulling algorithm/display" tested.

Foyle, David C.; Hooey, Becky L.; Bakowski, Deborah L.

2013-01-01

444

15-Deoxy-?12,14-prostaglandin J2 Reduces Liver Impairment in a Model of ConA-Induced Acute Hepatic Inflammation by Activation of PPAR? and Reduction in NF-?B Activity  

PubMed Central

Objective. 15-Deoxy-?12,14-prostaglandin J2 (15d-PGJ2) reduces inflammation and has been identified as an anti-inflammatory prostaglandin in numerous animal models. In this study, we investigated both effects of 15d-PGJ2 and its protection mechanism in concanavalin A- (ConA-) induced autoimmune hepatitis in mice. Materials and Methods. In vivo, Balb/C mice were injected with ConA (25?mg/kg) to induce acute autoimmune hepatitis, and 15d-PGJ2 (10??g or 25??g) was administered 1?h before the ConA injection. The histological grade, proinflammatory cytokine levels, and NF-?B and PPAR? activity were determined 6, 12, and 24?h after the ConA injection. In vitro, LO2 cells and RAW264.7 cells were pretreated with 15d-PGJ2 (2??M) 1?h before the stimulation with ConA (30??g/mL). The NF-?B and PPAR? activity were determined 30?min after the ConA administration. Results. Pretreatment with 15d-PGJ2 reduced the pathological effects of ConA-induced autoimmune hepatitis and significantly reduced the levels of cytokines after injection. 15d-PGJ2 activated PPAR?, blocked the degradation of I?B?, and inhibited the translocation of NF-?B into the nucleus. Conclusion. These results indicate that 15d-PGJ2 protects against ConA-induced autoimmune hepatitis by reducing proinflammatory cytokines. This reduction in inflammation may correlate with the activation of PPAR? and the reduction in NF-?B activity. PMID:25120564

Chen, Kan; Li, Jingjing; Wang, Junshan; Xia, Yujing; Dai, Weiqi; Wang, Fan; Shen, Miao; Cheng, Ping; Zhang, Yan; Wang, Chengfen; Yang, Jing; Zhu, Rong; Zhang, Huawei; Zheng, Yuanyuan; Lu, Jie; Fan, Zhuoyi; Zhou, Yingqun; Guo, Chuanyong

2014-01-01

445

DETECTION OF GENETICALLY MODIFIED MAIZE FOOD PRODUCTS BY THE POLYMERASE CHAIN REACTION DETECCIÓN DE PRODUCTOS DE MAIZ GENETICAMENTE MODIFICADOS POR LA REACCIÓN EN CADENA DE LA POLIMERASA  

Microsoft Academic Search

A polymerase chain reaction (PCR) was applied to detect genetically modified (GM) maize and soybean food product, using specific 35S promoter primers for inserted chimerical genes in maize or soybean. The PCR detected food products that include ingredients obtained from GMOs in maize grains and flour, as well as processed in foods such as tortillas (Mexican crepe), corn chips, corn

A. Mendoza; S. Fernández; M. A. Cruz; M. A. Rodríguez-Perez; D. Resendez-Perez; H. A. Barrera Saldaña

2006-01-01

446

Estudio de la fotoabsorción y fotoionización de la molécula de alta relevancia atmosférica no a través de los estados Rydberg con la metodología MQDO  

NASA Astrophysics Data System (ADS)

Los procesos de fotoionización son de una importancia fundamental [1] y encuentran aplicación en un gran número de contextos científicos: Astrofísica [2], química de las radiaciones, biología. Los investigadores de dichos campos, necesitan de valores de fiables de secciones eficaces para la fotoionización parcial, la Fotoabsorción, así como para los procesos de fotofragmentación en amplios intervalos espectrales, particularmente en estudios de modelización [3-5]. En este trabajo se ha centrado la atención sobre el oxido nítrico, que se ha considerado apropiado y relevante por varios motivos: por el trascendental papel que representa en la física y química de la alta atmosfera [6], aparte de por estar íntimamente relacionado con los problemas de contaminación. Los procesos de recombinación disociativa [7] del NO, donde los estados Rydberg se encuentran directamente implicados, son relevantes, por ejemplo, en las regiones E y F de la ionosfera [7]. En este trabajo se estudia la fotoionización del NO desde el estado fundamental con la versión molecular del método del orbital de defecto cuántico (MQDO). Para ello se calcula el diferencial de las fuerzas de oscilador parciales que constituyen los canales de fotoionización del NO desde el estado fundamental. La continuidad del diferencial de fuerza de oscilador calculada a través del umbral de fotoionización, esto es, en las regiones del espectro discreta y del continua, se adopta como criterio de calidad la escasez de datos comparativos [8].

Bustos, E.; Velasco, A. M.; Martín, I.; Lavín, C.

447

Potential pros and cons of external healthcare performance evaluation systems: real-life perspectives on Iranian hospital evaluation and accreditation program  

PubMed Central

Background: Performance evaluation is essential to quality improvement in healthcare. The current study has identified the potential pros and cons of external healthcare evaluation programs, utilizing them subsequently to look into the merits of a similar case in a developing country. Methods: A mixed method study employing both qualitative and quantitative data collection and analysis techniques was adopted to achieve the study end. Subject Matter Experts (SMEs) and professionals were approached for two-stage process of data collection. Results: Potential advantages included greater attractiveness of high accreditation rank healthcare organizations to their customers/purchasers and boosted morale of their personnel. Downsides, as such, comprised the programs’ over-reliance on value judgment of surveyors, routinization and incurring undue cost on the organizations. In addition, the improved, standardized care processes as well as the judgmental nature of program survey were associated, as pros and cons, to the program investigated by the professionals. Conclusion: Besides rendering a tentative assessment of Iranian hospital evaluation program, the study provides those running external performance evaluations with a lens to scrutinize the virtues of their own evaluation systems through identifying the potential advantages and drawbacks of such programs. Moreover, the approach followed could be utilized for performance assessment of similar evaluation programs. PMID:25279381

Jaafaripooyan, Ebrahim

2014-01-01

448

On the role of localized surface plasmon resonance in UV-Vis light irradiated Au/TiO? photocatalysis systems: pros and cons.  

PubMed

The role of localized surface plasmon resonance (LSPR) in UV-Vis light irradiated Au/TiO2 photocatalysis systems has been investigated, and it is demonstrated experimentally for the first time that both pros and cons of LSPR exist simultaneously for this photocatalytic reaction. We have proved that when operating under mixed UV and green light irradiation, the LSPR injected hot electrons (from the Au nanoparticles to TiO2 under green light irradiation) may surmount the Schottky barrier (SB) formed between the Au nanoparticles and TiO2, and flow back into the TiO2. As a result, these electrons may compensate for and even surpass those transferred from TiO2 to the Au nanoparticles, thus accelerating the recombination of UV excited electron-hole pairs in TiO2. This is the negative effect of LSPR. On the other hand, more hot electrons existing on the surface of the Au nanoparticles due to LSPR would favor the photocatalytic reaction, which accompanied by the negative effect dominates the overall photocatalytic performance. The presented results reveal the multi-faceted essence of LSPR in Au/TiO2 structures, and is instructive for the application of metal-semiconductor composites in photocatalysis. Moreover, it is confirmed that the extent to which the above pros and cons of LSPR dominate the overall photocatalytic reaction depends on the intensity ratio of visible to UV light. PMID:25665512

Lin, Zhongjin; Wang, Xiaohong; Liu, Jun; Tian, Zunyi; Dai, Loucheng; He, Beibei; Han, Chao; Wu, Yigui; Zeng, Zhigang; Hu, Zhiyu

2015-03-01

449

A wireless, remote-query and high sensitivity Escherichia coli O157: H7 biosensor based on the recognition action of Con A  

PubMed Central

Escherichia coli O157: H7 is detected using a remote-query (wireless, passive) magnetoelastic sensor platform to which a 1 µm-thick layer of Bayhydrol 110 and then a layer of functionalized mannose is applied. The multivalent binding of lectin concanavalin A (Con A) to the E. coli surface O-antigen and mannose favors the strong adhesion of E. coli to the mannose modified magnetoelastic sensor; E. coli is rigidly and strongly attached on the mannose-modified sensor through Con A, which works as a bridge to bind to the E. coli surface O-antigen and mannose modified sensor surface. As E. coli is bound to the sensor its resonance frequency shifts, enabling quantification of E. coli concentration with a limit of detection of 60 cells/mL and a linear logarithmic response range of 6.0×101 to 6.1×109 cells/mL. The analysis can be directly conducted without incubation, and completed in 3 h or less. PMID:19548666

Lu, Qingzhu; Lin, Hailan; Ge, Shutian; Luo, Shenglian; Cai, Qingyun; Grimes, Craig A.

2009-01-01

450

Aceptabilidad del diagnóstico rápido casero para HIV entre hombres gay y otros hombres que tienen sexo con hombres (G&HSH) de la Ciudad de Buenos Aires  

PubMed Central

Resumen El uso del diagnóstico rápido para HIV en Argentina, así como otros países de Latinoamérica, ha sido limitado hasta el momento. Este trabajo reporta los resultados provenientes de un estudio cualitativo realizado entre hombres gays y otros hombres que tienen sexo con hombres (G&HSH) de la Ciudad de Buenos Aires, Argentina. El objetivo principal del mismo fue conocer las ventajas y desventajas que los hombres G&HSH perciben en relación al diagnóstico rápido casero para HIV. Se realizaron ocho grupos focales con 73 participantes en los cuales se discutió acerca de las ventajas y desventajas del uso de los diagnósticos rápidos. Las respuestas fueron codificadas utilizando un programa para análisis de datos cualitativos (NVivo) y analizadas temáticamente. Los participantes describieron numerosas ventajas sobre el uso del diagnóstico rápido casero, aunque algunos reportaron importantes preocupaciones dentro de las cuales se destaca la posibilidad de impulsos suicidas si alguien recibe un resultado positivo estando solo. En términos generales se observó una gran aceptabilidad para el uso del diagnóstico rápido si el mismo es realizado por personal de salud en lugares acondicionados para este fin. PMID:25284951

Balán, Iván C.; Carballo-Diéguez, Alex; Marone, Rubén O.; Pando, María A.; Barreda, Victoria; Ávila, María M.

2011-01-01

451

FACTORES SOCIO-ESTRUCTURALES Y EL ESTIGMA HACIA EL VIH/SIDA: EXPERIENCIAS DE PUERTORRIQUEÑOS/AS CON VIH/SIDA AL ACCEDER SERVICIOS DE SALUD  

PubMed Central

RESUMEN El estigma relacionado al VIH/SIDA continúa afectando la prestación de servicios de salud y el bienestar físico y mental de las personas con VIH/SIDA (PVS). Recientemente la literatura científica ha señalado la importancia de comprender las manifestaciones de estigma más allá de las interacciones individuales. Por tal razón, investigaciones recientes en y fuera de Puerto Rico enfatizan la importancia de entender cómo factores socio-estructurales (FSE) influyen en los procesos de estigmatización social. Con el propósito de examinar los FSE que influyen en las manifestaciones de estigma relacionado al VIH/SIDA, realizamos y analizamos nueve grupos focales compuestos por hombres y mujeres en tratamiento para el VIH/SIDA que habían tenido experiencias estigmatizantes. Los participantes identificaron FSE relacionados a las manifestaciones de estigma, tales como el uso de viviendas especializadas, descentralización de los servicios de salud y el desarrollo de protocolos administrativos excluyentes en los servicios de salud. Los resultados demuestran la importancia de considerar los FSE en el desarrollo e implementación de intervenciones dirigidas a la población. PMID:24639599

RIVERA-DIAZ, MARINILDA; VARAS-DIAZ, NELSON; REYES-ESTRADA, MARCOS; SURO, BEATRIZ; CORIANO, DORALIS

2013-01-01

452

Aceptabilidad del diagnóstico rápido casero para HIV entre hombres gay y otros hombres que tienen sexo con hombres (G&HSH) de la Ciudad de Buenos Aires.  

PubMed

El uso del diagnóstico rápido para HIV en Argentina, así como otros países de Latinoamérica, ha sido limitado hasta el momento. Este trabajo reporta los resultados provenientes de un estudio cualitativo realizado entre hombres gays y otros hombres que tienen sexo con hombres (G&HSH) de la Ciudad de Buenos Aires, Argentina. El objetivo principal del mismo fue conocer las ventajas y desventajas que los hombres G&HSH perciben en relación al diagnóstico rápido casero para HIV. Se realizaron ocho grupos focales con 73 participantes en los cuales se discutió acerca de las ventajas y desventajas del uso de los diagnósticos rápidos. Las respuestas fueron codificadas utilizando un programa para análisis de datos cualitativos (NVivo) y analizadas temáticamente. Los participantes describieron numerosas ventajas sobre el uso del diagnóstico rápido casero, aunque algunos reportaron importantes preocupaciones dentro de las cuales se destaca la posibilidad de impulsos suicidas si alguien recibe un resultado positivo estando solo. En términos generales se observó una gran aceptabilidad para el uso del diagnóstico rápido si el mismo es realizado por personal de salud en lugares acondicionados para este fin. PMID:25284951

Balán, Iván C; Carballo-Diéguez, Alex; Marone, Rubén O; Pando, María A; Barreda, Victoria; Avila, María M

2011-03-01

453

The soil-water balance simulations of a grassland in response to CO2, rainfall, and biodiversity manipulations at BioCON  

NASA Astrophysics Data System (ADS)

The BioCON (Biodiversity, CO2 and N) experiment has been continuously running since 1997. Operated by the University of Minnesota and located within the Cedar Creek Ecosystem Science Reserve in Minnesota, USA, BioCON is a Free-Air CO2 Enrichment (FACE) experiment that investigates plant community response to three key environmental variables: nitrogen, atmospheric CO2 and biodiversity. More recently rainfall exclusion and temperature manipulation were added to the experiment which amounts to 371 plots. The site attempts to replicate predicted average temperature increases and a northern shift of plant species and any associated consequences. FACE experiments have been conducted for a number of years in different countries, but the focus has generally been on how plant communities, soil respiration and microbes respond. Minimal work has been focused on the hydrologic aspects of these experiments which are potentially valuable for investigating global warming effects on local and plot-scale ecohydrology. Thus, the objective of this work is to characterize and model unsaturated flow for different CO2 and rainfall treatments in order to see how they affect soil moisture dynamics and groundwater recharge on grasslands of central Minnesota. Our study focuses on simulating soil moisture dynamics in eighteen of the BioCON plots: six bare plots with regular rainfall regimes (zero plant species, three plots with elevated atmospheric CO2 levels), six regular rainfall regimes (nine plant species, three plots with elevated atmospheric CO2 levels) and six reduced rainfall regimes (nine plant species, three plots with elevated atmospheric CO2 levels). The Simultaneous Heat and Water (SHAW) model, which solves the Richards equation for unsaturated zone water flow coupled to a comprehensive energy balance model, was parameterized with a combination of field and lab estimates of soil properties. Field estimates of saturated hydraulic conductivity using tension infiltrometers ranged from 9.8 x 10-4 to 6.7 x 10-3 cm/s. Soil cores were collected and analyzed for soil hydraulic properties (texture, unsaturated hydraulic conductivity and moisture retention). From the grain size analyzes of soil samples collected every 10 cm until 1m depth, the soil is homogenous and on average 87% sand, 11% silt and 2% clay. We will be presenting results from the simulations and statistical comparisons to observations of soil moisture at four depths in each plot.

Flinker, R. H.; Cardenas, M.; Caldwell, T. G.; Rich, R.; Reich, P.

2013-12-01

454

A Novel In Vivo siRNA Delivery System Specifically Targeting Liver Cells for Protection of ConA-Induced Fulminant Hepatitis  

PubMed Central

Background Fulminant hepatitis progresses to acute liver failure (ALF) when the extent of hepatocyte death exceeds the liver's regenerative capacity. Although small interfering RNA (siRNA) appears promising in animal models of hepatitis, the approach is limited by drawbacks associated with systemic administration of siRNA. The aim of this study is to develop a hepatocyte-specific delivery system of siRNA for treatment of fulminant hepatitis. Methodology/Principal Findings Galactose-conjugated liposome nano-particles (Gal-LipoNP) bearing siRNA was prepared, and the particle size and zeta potential of Gal-LipoNP/siRNA complexes were measured. The distribution, cytotoxicity and gene silence efficiency were studied in vivo in a concanavalin A (ConA)-induced hepatitis model. C57BL/6 mice were treated with Gal-LipoNP Fas siRNA by i.v. injection 72 h before ConA challenge, and hepatocyte injury was evaluated using serum alanine transferase (ALT) and aspartate transaminase (AST) levels, as well as liver histopathology and TUNEL-positive hepatocytes. The galactose-ligated liposomes were capable of encapsulating >96% siRNA and exhibited a higher stability than naked siRNA in plasma. Hepatocyte-specific targeting was confirmed by in vivo delivery experiment, in which the majority of Gal-LipoNP-siRNA evaded nuclease digestion and accumulated in the liver as soon as 6 h after administration. In vivo gene silencing was significant in the liver after treatment of Gal-Lipo-siRNA. In the ConA-induced hepatitis model, serum levels of ALT and AST were significantly reduced in mice treated with Gal-lipoNP-siRNA as compared with control mice. Additionally, tissue histopathology and apoptosis showed an overall reduction of injury in the Gal-LipoNP siRNA-treated mice. Conclusions/Significance This study is the first to our knowledge to demonstrate reduction of hepatic injury by liver-specific induction of RNA interference using Gal-LipoNP Fas siRNA, highlighting a novel RNAi-based therapeutic potential in many liver diseases. PMID:22970170

Jiang, Nan; Zhang, Xusheng; Zheng, Xiufen; Chen, Di; Siu, Kingsun; Wang, Hongmei; Ichim, Thomas E.; Quan, Douglas; McAlister, Vivian; Chen, Guihua; Min, Wei-Ping

2012-01-01

455

On the role of localized surface plasmon resonance in UV-Vis light irradiated Au/TiO2 photocatalysis systems: pros and cons  

NASA Astrophysics Data System (ADS)

The role of localized surface plasmon resonance (LSPR) in UV-Vis light irradiated Au/TiO2 photocatalysis systems has been investigated, and it is demonstrated experimentally for the first time that both pros and cons of LSPR exist simultaneously for this photocatalytic reaction. We have proved that when operating under mixed UV and green light irradiation, the LSPR injected hot electrons (from the Au nanoparticles to TiO2 under green light irradiation) may surmount the Schottky barrier (SB) formed between the Au nanoparticles and TiO2, and flow back into the TiO2. As a result, these electrons may compensate for and even surpass those transferred from TiO2 to the Au nanoparticles, thus accelerating the recombination of UV excited electron-hole pairs in TiO2. This is the negative effect of LSPR. On the other hand, more hot electrons existing on the surface of the Au nanoparticles due to LSPR would favor the photocatalytic reaction, which accompanied by the negative effect dominates the overall photocatalytic performance. The presented results reveal the multi-faceted essence of LSPR in Au/TiO2 structures, and is instructive for the application of metal-semiconductor composites in photocatalysis. Moreover, it is confirmed that the extent to which the above pros and cons of LSPR dominate the overall photocatalytic reaction depends on the intensity ratio of visible to UV light.The role of localized surface plasmon resonance (LSPR) in UV-Vis light irradiated Au/TiO2 photocatalysis systems has been investigated, and it is demonstrated experimentally for the first time that both pros and cons of LSPR exist simultaneously for this photocatalytic reaction. We have proved that when operating under mixed UV and green light irradiation, the LSPR injected hot electrons (from the Au nanoparticles to TiO2 under green light irradiation) may surmount the Schottky barrier (SB) formed between the Au nanoparticles and TiO2, and flow back into the TiO2. As a result, these electrons may compensate for and even surpass those transferred from TiO2 to the Au nanoparticles, thus accelerating the recombination of UV excited electron-hole pairs in TiO2. This is the negative effect of LSPR. On the other hand, more hot electrons existing on the surface of the Au nanoparticles due to LSPR would favor the photocatalytic reaction, which accompanied by the negative effect dominates the overall photocatalytic performance. The presented results reveal the multi-faceted essence of LSPR in Au/TiO2 structures, and is instructive for the application of metal-semiconductor composites in photocatalysis. Moreover, it is confirmed that the extent to which the above pros and cons of LSPR dominate the overall photocatalytic reaction depends on the intensity ratio of visible to UV light. Electronic supplementary information (ESI) available: Detailed description of the calculation parameters. Additional I-V characteristics of bare TiO2 and the tip of CAFM probe. See DOI: 10.1039/c4nr06929c

Lin, Zhongjin; Wang, Xiaohong; Liu, Jun; Tian, Zunyi; Dai, Loucheng; He, Beibei; Han, Chao; Wu, Yigui; Zeng, Zhigang; Hu, Zhiyu

2015-02-01

456

Synsedimentary deformation of Pleistocene glaciolacustrine deposits in the Albese con Cassano Area (Southern Alps, Northern Italy), and possible implications for paleoseismicity  

NASA Astrophysics Data System (ADS)

We describe and interpret the well exposed soft-sediment deformations preserved in a Mid-Pleistocene proglacial sequence outcropping at Albese con Cassano, near Como (Southern Alps, N Italy). The observed deformations affect six distinct stratigraphic intervals within the same depositional sequence. The stratigraphy of this sequence, the geomorphic setting, and the careful geological mapping of the area clearly show that these deformations are not the result of glaciotectonics or cryoturbation, but are due to six separate events of synsedimentary liquefaction. In particular, the 3 basal deformed units include sand and gravel volcanoes that formed at the bottom of a proglacial lake. We examined several hypothesis of possible causative mechanism for the formation of these features. Taking into account all the information available on the local geology and sedimentary environment, it is possible to assess that the liquefaction features at Albese con Cassano had a coseismic origin. To our knowledge, this would be the first report of similar evidence of paleoseismicity in the Lombardia Southern Alps. Also, there is no record of historical liquefaction triggered by seismic events in an area of ca. 70 km of radius near Albese con Cassano, including the town of Como, the large metropolitan area of Milano and most of W Lombardia, that is one of the largest industrial districts in Europe. Therefore, the interpretation of the observed deformations can have critical impact for understanding the current seismicity level in the region, and mitigating the associated risk. In this paper we show that this interpretation is not a simple process. Liquefaction features must be treated with caution in order to derive suitable information for seismic hazard characterization, even if their coseismic origin has been definitely proved. It is necessary to understand the amount of seismic shaking (for instance, in terms of local macroseismic intensity) that can have produced that specific feature at that specific site, the location of the causative seismic event (epicenter and focal depth), and eventually its size (in terms of epicentral intensity and/or earthquake magnitude). In the case of Albese con Cassano, the implications in terms of seismic hazard of the observed possible earthquake paleoliquefactions can only be assessed through the definition of several scenarios, taking into account: a) different thresholds of shaking for triggering the described synsedimentary structures, and b) different seismotectonic frameworks related to the Mid-Pleistocene to Holocene evolution of the S Alps, including seismicity induced by isostatic glacial rebound. We conclude that it is worth checking these scenarios in the field with further paleoseismological research on other possible evidence of past earthquakes. There are no unequivocal sedimentological indicators of paleoseismicity, however, when carefully interpreted within the proper local seismotectonic context and compared with other earthquake-induced features, soft-sediment deformations can offer information of critical value for seismic hazard assessment.

Chunga, Kervin; Livio, Franz; Michetti, Alessandro M.; Serva, Leonello

2007-03-01

457

Phosphorus as a typological and mineralization potential indicator: the Cape Granite Suite of the Saldania belt as a case study  

NASA Astrophysics Data System (ADS)

Granitoids of the Cape Granite Suite can be classified as S-, I- and A-types according to their P 2O 5 contents. The S-type granitoids dominate in the western Tygerberg terrane, the I-type granitoids in the central Swartland as well as the eastern Boland terranes and the A-types are intrusive in both the Swartland and Tygerberg terranes. The subdivision of the three major groups into six granitic associations, namely two Stype ( Sa and Sb), two I-type ( Ia and Ib) and two A-type associations ( Aa and Ab) was performed by a combination of mineralogical and petrochemical parameters utilizing P 2O 5, Th, Nb, Zr, Na 2O, K 2O and the rare earth elements. The S-type granitoids are enriched in P 2O 5 above values for theoretical apatite saturation curves. A distinction is made between the Sa1 association with P enrichment regardless of the degree of differentiation and the Sa2 association with considerable enrichment during advanced stages of differentiation. Granitoids of the Ia association follow high temperature apatite saturation curves. Fractionated Ib association granitoids adhere to these curves up to advanced stages of differentiation, where P 2O 5 is slightly enriched. A-type granitoids of both associations are depleted in P 2O 5. The mineralization potential of granitoids of the Suite is specific [W?Mo(Cu) or W?Sn(Au, As) or Mo?Cu(Au, As)] and related to granitoid association as well as geochemical parameters in each association. High P 2O 5 granitoids (S-types) have the potential for W?Sn(Au, As) mineralization when late differentiates ( Sa2 association) are particularly enriched in P 2O 5 following a trend perpendicular to theoretical apatite saturation curves. Intermediate P 2O 5 granitoids (1-types) are potentially mineralized [W?Mo(Cu)] when they follow high temperature apatite saturation curves and have high Ca/P values, as well as a wide range in Ca/P ratios. A-type granitoids with Mo?Cu(Au) mineralization are low in P 2O 5 and high in Nb, Th, Zr and CO 2. Barren A-type granitoids are low in P 2O 5 and CO 2 and high in Y and Th. High P 2O 5 peraluminous Stype granitoids are late orogenic to post-orogenic. The intermediate P 2O 5 metaluminous I-type granites are anorogenic and intruded during a long time span (560-517 Ma) in a marginal position with respect to a Proterozoic subduction zone. P 2O 5 depleted granitoids of the Aa and Ab associations have the typical characteristics of anorogenic alkali granites.

Scheepers, R.; Ozendaal, A.

1995-07-01

458

Structural studies of some phospho-borate glasses using ultrasonic pulse-echo technique, DSC and IR spectroscopy  

NASA Astrophysics Data System (ADS)

Glasses in the system (95- x) [0.25 Na 2O-0.75 B 2O 3]- x P 2O 5-5 Fe 2O 3 (0? x?15 mol%), have been prepared by the melt quenching technique. Elastic properties and FT-IR spectroscopic studies have been employed to study the role of P 2O 5 on the structure of the glass system. Elastic properties Poisson's ratio, micro-hardness and Debye temperature have been investigated using sound wave velocity measurements at 4 MHz (both longitudinal and shear) at room temperature. The results showed that the density and the molar volume increase as both sound velocities and the determined glass transition temperatures decrease with increasing the contents of P 2O 5. Infrared spectra of the glasses reveal that the borate network consists of diborate units and is affected by the increase in the concentration of P 2O 5 content as a second network former. These results are interpreted in terms of the replacement of the diborate units with B-O-B bridges by phosphate units with non-bridging oxygens (NBOs). Therefore, the elastic moduli are observed to decrease with the increase in P 2O 5 content.

Gaafar, M. S.; Afifi, H. A.; Mekawy, M. M.

2009-06-01

459

In questa tesi si presenta un modello molto semplice del DNA. Esso rappresenta la doppia elica di Watson e Crick con tre variabili per ciascuna coppia di basi che ne forniscono l'altezza lungo  

E-print Network

elica di Watson e Crick con tre variabili per ciascuna coppia di basi che ne forniscono l'altezza lungo'ADN est introduit. Il d#19;ecrit la double h#19;elice de Watson et Crick avec trois variables par paire de

Cocco, Simona

460

Este trabajo ha contado con la financiacin del Plan Nacional de Ciencia y Tecnologa (CICYT TEL96 1304C0201) y del Departamento de Industria del Gobierno Vasco (PGTI96 CO96RO01).  

E-print Network

�ltimamente se están empleando los términos ``campus virtual'' o ``facultad virtual'' pare referirse al síncrono, con el profesor y los estudiantes reunidos a una hora en un lugar (un aula). Los sistemas de la distancia. 1. Introducción: Concepto de ``Facultad Virtual'' o ``Campus Virtual'' El término de

Miguel-Alonso, José

461

08853010/$25.00 2008 IEEE 1IEEE TransacTIons on UlTrasonIcs, FErroElEcTrIcs, and FrEqUEncy conTrol, vol. 55, no. 9, sEpTEmbEr 2008  

E-print Network

mechanomyography [3] (smmG) or acceleromyog- raphy [4], which records pressure or acceleration on the skin surface spectroscopy [6], cine phase contrast mr imaging [7], mr elastography [8], doppler imaging [9 on the tissue velocity field estimation during con- traction, cine phase contrast mr [7] or ultrasound doppler

Paris 7 - Denis Diderot, Université

462

Figure 1.-The older commercial-type dredge was usually of two-piece con-struction as clammers felt it tended bottom better. It was also easier to handle over  

E-print Network

Figure 1.-The older commercial-type dredge was usually of two-piece con- struction as clammers felt. NULK Rear cage Chain bag I Basic Concept Development The dredge system in use at the time the choice was made to go to a new survey was a 48- inch (122 em) surface- supplied hydraulic dredge (Fig. 2

463

Los estudios de las dietas alimenticias bajas en grasa, altas en fibra y ricas en frutas y vegetales no revelan efecto alguno en la formación de nuevos pólipos colorrectales en personas con antecedentes de pólipos precancerosos  

Cancer.gov

Dos nuevos estudios sobre el impacto nutricional en personas con alto riesgo de desarrollar cáncer colorrectal no mostraron evidencia de que la dieta afecta la formación de pólipos colorectales precancerosos (pólipos adenomatosos o adenomas) en personas a las que ya se les extrajo un pólipo.

464

08853010/$25.00 2009 IEEE 2679IEEE TransacTIons on UlTrasonIcs, FErroElEcTrIcs, and FrEqUEncy conTrol, vol. 56, no. 12, dEcEmbEr 2009  

E-print Network

EqUEncy conTrol, vol. 56, no. 12, dEcEmbEr 2009 Abstract--Near-field acoustic levitation (NFAL) has been used with experimentally measured levitation force. I. Introduction acoustic levitation is one of the most suitable meth, insulator, or conductor, magnetic or nonmagnetic, can be manipulated by acoustic levitation

Cao, Wenwu

465

In this exercise you will use the information from all-atom contacts and sidechain rotamer con-formations to explore whether or not a specific mutation can be accommodated without moving the  

E-print Network

as a remote job. Probe is not a Java program but a platform-specific compiled version is supplied as part-atom contacts and sidechain rotamer con- formations to explore whether or not a specific mutation can each rotamer in turn. All but one are really dreadful, but one fits quite well. What is the name

Richardson, David

466

Investigaccion-accion en la sala de clases sobre las creencias de la cultura de la ciencia de un grupo de estudiantes universitarios y su relacion reciproca con el aprendizaje de las ciencias biologicas  

Microsoft Academic Search

La investigacion---accion que se llevo a cabo en la sala de clases tenia como punto de partida las creencias de la cultura de la ciencia de un grupo de estudiantes universitarios para luego examinar sus implicaciones en el proceso de aprendizaje de las Ciencias Biologicas. ¿Que se supone que hagan las creencias en relacion con el aprendizaje? ¿En que consiste

Lizzette Astrid Cordova-Santiago

2004-01-01

467

Selective removal of plutonium 238 from a canal sediment using a carbonate-chelant soil washing technology (ACT*DE*CON).  

PubMed

The Mound laboratory site in Miamisburg, OH, a former plutonium processing facility, contains approximately 40000 yd(3) (30,580 m3) of plutonium- and thorium-contaminated soils and sediments at levels that require remediation. Existing applicable remediation technologies are unsatisfactory, because they are expensive and do not provide volume reduction. ACT*DE*CON is a chemical soil leaching technology for the treatment of soils that utilizes contaminant dissolution via dilute selective solutions to remove radionuclides. In bench-scale tests, process parameters were developed for the optimal treatment of the Miami Erie Canal soil at the Mound site, combining the maximum plutonium removal with an acceptable amount of soil dissolution and minimizing the costs of reagents. Parameters evaluated included soil to extractant mass ratio, temperature, rinse solution composition, kinetics, and the application of several dewatering aids. Plutonium removal rates of >95% were achieved, and the residual plutonium in the treated soil proved to be very immobile-confirming that the process had removed the most accessible species of the radionuclide. Currently being tested at Mound is an engineering scale-up that includes an attrition scrubber, a counter-current extractor, and a reverse osmosis system. Economic evaluations based on bench-scale results put the treatment cost at US$278/yd(3) (US$364/m3), compared to US$350/yd(3) (US$458/m3) for the 'box-and-bury' baseline alternative treatment system. PMID:10379033

Negri, M C; Swift, N A; Carfagno, D; Neff, R A; North, J

1999-04-23

468

Entrevista con José Ramón Enríquez  

E-print Network

libro muy interesante sobre Sor Juana Inés de la Cruz, quien no era específicamente española, pero pertenece a nuestro Siglo de Oro mexicano. Yo era el pequeño nerd de anteojitos que, mientras sus compañeros jugaban fútbol, estaba escondido en las...

Loisel, Clary

2002-10-01

469

Quick Chili Con Carne Ingredients  

E-print Network

tablespoons chili powder 1 teaspoon cumin Directions 1. Open beans and pour into colander. Rinse under running, tomato puree, garlic powder, chili powder and cumin to skillet. Bring to a boil, cover and reduce heat. 6

Liskiewicz, Maciej

470

Surgical treatment of prolactinomas: cons.  

PubMed

Prolactinomas account for approximately 40 % of all pituitary adenomas. Over 95 % of prolactinomas are microadenomas (< 10 mm diameter). Treatment is indicated to correct hypogonadism, restore other hormonal deficits, and alleviate local mass effects. Dopamine agonists (DA) are highly effective in achieving these goals and are well-tolerated. The vast majority of prolactinomas will respond to conventional doses of cabergoline (?2 mg/week) that do not carry an increased risk of cardiac valvular abnormalities. DA therapy may be successful withdrawn in a subset of patients and thus is not necessarily a lifelong commitment. Although transsphenoidal surgery (TSS) is an option for prolactinoma treatment, it is less effective than medical management, carries considerably more risk, and is more expensive. The benefit/risk ratio for DA therapy compared to TSS actually becomes increasingly more favorable as tumor size increases. Therefore DA should remain the clear treatment of choice for essentially all patients with prolactinomas, reserving TSS as a second-line option for the very small number of patients that do not tolerate or are completely resistant to DA therapy. PMID:25112227

Bloomgarden, Eve; Molitch, Mark E

2014-12-01

471

Cabergoline treatment in acromegaly: cons.  

PubMed

Many options are available for the treatment of acromegaly, including surgery, radiotherapy, and medical treatment. Cabergoline (CAB), a dopamine agonist with high affinity for dopamine receptor type 2, has been used both in monotherapy and in conjunction with somatostatin analogs (SSAs). Although it is administered orally and has a relatively lower-cost in comparison with SSAs, few studies have demonstrated its usefulness, there is a lack of randomized-controlled trials and other drugs (SSAs and pegvisomant) with more data in the literature are available; these issues are the main drawbacks of adopting CAB for the treatment of acromegaly. PMID:24504766

Kasuki, Leandro; Vieira Neto, Leonardo; Gadelha, Mônica R

2014-06-01

472

Dos tardes con Carlos Solórzano  

E-print Network

para vivir ni mucho menos para morir. Y claro, cuando uno tiene un pensamiento filosófico, abstracto, más o menos literario, que viene a ser confirmado por un hecho de la realidad, forzosamente se acendra como una vivencia casi inseparable de la... Camus, de Ghelderode; el teatro del absurdo de Beckett, de Ionesco? Empezando por el final de su pregunta, el teatro abstracto, descarnado, un tanto deshumanizado de Beckett y de Ionesco, realmente lo admiro, pero no creo haber tomado nada de eso. En...

Mé ndez-Faith, Teresa

1984-10-01

473

Quantum Computing: Pro and Con  

E-print Network

I assess the potential of quantum computation. Broad and important applications must be found to justify construction of a quantum computer; I review some of the known quantum algorithms and consider the prospects for finding new ones. Quantum computers are notoriously susceptible to making errors; I discuss recently developed fault-tolerant procedures that enable a quantum computer with noisy gates to perform reliably. Quantum computing hardware is still in its infancy; I comment on the specifications that should be met by future hardware. Over the past few years, work on quantum computation has erected a new classification of computational complexity, has generated profound insights into the nature of decoherence, and has stimulated the formulation of new techniques in high-precision experimental physics. A broad interdisciplinary effort will be needed if quantum computers are to fulfill their destiny as the world's fastest computing devices. (This paper is an expanded version of remarks that were prepared for a panel discussion at the ITP Conference on Quantum Coherence and Decoherence, 17 December 1996.)

John Preskill

1997-08-26

474

DESTRUCCIÓN ELECTRÓNICA CON PULSOS ELECTROMAGNÉTICOS  

Microsoft Academic Search

This article discusses the mechanisms of electromagnetic pulse radiation and generation, its destructive effect and protection method for electronics equipments. The electromagnetic pulse (EMP) has been known since 1940 when the nuclear weapon was developed and tested. The nuclear blast called \\

475

Crossing the Rubric-Con  

ERIC Educational Resources Information Center

This essay engages the prospect and peril of employing rubrics in America. It discusses how institutional independence affects the enterprise, and addresses whether rubrics will be received as salvation or subservience by educational agents. It asks how rubrics can benefit stakeholders while examining their unintended consequences. It concludes by…

Bailey, James R.

2014-01-01

476

Quantum computing: pro and con  

Microsoft Academic Search

I assess the potential of quantum computation. Broad and important applications must be found to justify construction of a quantum computer; I review some of the known quantum algorithms and consider the prospects for finding new ones. Quantum computers are notoriously susceptible to making errors; I discuss recently developed fault-tolerant procedures that enable a quantum computer with noisy gates to

John Preskill

1998-01-01

477

Quantum computing: pro and con  

Microsoft Academic Search

I assess the potential of quantum computation. Broad and important applications must be found to justify construction of a quantum computer; I review some of the known quantum algorithms and consider the prospects for nding new ones. Quantum computers are notoriously susceptible to making errors; I discuss recently developed fault-tolerant procedures that enable a quantum computer with noisy gates to

Charles C. Lauritsen

478

Maintaining Consistent, Minimal Con gurations  

E-print Network

as customer needs change. From the hardware point of view, the various inter- changeable components must be standardized and plug compatible. From the software point of view, there are two interdependent things needed the products. This means that, among other things, that system storage space is likely to be limited to just

Perry, Dewayne E.

479

Biochar Usage: Pros and Cons  

Technology Transfer Automated Retrieval System (TEKTRAN)

Soil fertility benefits of charcoal application have been reported as early as 1847 indicating that plant nutrients are sorbed within charcoal pores. The use of biomass-derived black carbon or biochar, the solid byproduct from the pyrolysis processing of any organic feedstock, has garnered recent a...

480

Dietary inflammatory index and anthropometric measures of obesity in a population sample at high cardiovascular risk from the PREDIMED (PREvención con DIeta MEDiterránea) trial.  

PubMed

The dietary inflammatory index (DII) is a new tool to assess the inflammatory potential of the diet. In the present study, we aimed to determine the association between the DII and BMI, waist circumference and waist:height ratio (WHtR). We conducted a cross-sectional study of 7236 participants recruited into the PREvención con DIeta MEDiterránea trial. Information from a validated 137-item FFQ was used to calculate energy, food and nutrient intakes. A fourteen-item dietary screener was used to assess adherence to the Mediterranean diet (MeDiet). Sex-specific multivariable linear regression models were fitted to estimate differences (and 95 % CI) in BMI, waist circumference and WHtR across the quintiles of the DII. All nutrient intakes, healthy foods and adherence to the MeDiet were higher in the quintile with the lowest DII score (more anti-inflammatory values) except for intakes of animal protein, saturated fat and monounsaturated fat. Although an inverse association between the DII and total energy was apparent, the DII was associated with higher average BMI, waist circumference and WHtR after adjusting for known risk factors. The adjusted difference in the WHtR for women and men between the highest and lowest quintiles of the DII was 1·60 % (95 % CI 0·87, 2·33) and 1·04 % (95 % CI 0·35, 1·74), respectively. Pro-inflammatory scores remained associated with obesity after controlling for the effect that adherence to a MeDiet had on inflammation. In conclusion, the present study shows a direct association between the DII and indices of obesity, and supports the hypothesis that diet may have a role in the development of obesity through inflammatory modulation mechanisms. PMID:25720588

Ruiz-Canela, M; Zazpe, I; Shivappa, N; Hébert, J R; Sánchez-Tainta, A; Corella, D; Salas-Salvadó, J; Fitó, M; Lamuela-Raventós, R M; Rekondo, J; Fernández-Crehuet, J; Fiol, M; Santos-Lozano, J M; Serra-Majem, L; Pinto, X; Martínez, J A; Ros, E; Estruch, R; Martínez-González, M A

2015-03-01

481

Coagulase-negative staphylococci (CoNS) isolated from ready-to-eat food of animal origin--phenotypic and genotypic antibiotic resistance.  

PubMed

The aim of this work was to study the pheno- and genotypical antimicrobial resistance profile of coagulase negative staphylococci (CoNS) isolated from 146 ready-to-eat food of animal origin (cheeses, cured meats, sausages, smoked fishes). 58 strains were isolated, they were classified as Staphylococcus xylosus (n = 29), Staphylococcus epidermidis (n = 16); Staphylococcus lentus (n = 7); Staphylococcus saprophyticus (n = 4); Staphylococcus hyicus (n = 1) and Staphylococcus simulans (n = 1) by phenotypic and genotypic methods. Isolates were tested for resistance to erythromycin, clindamycin, gentamicin, cefoxitin, norfloxacin, ciprofloxacin, tetracycline, tigecycline, rifampicin, nitrofurantoin, linezolid, trimetoprim, sulphamethoxazole/trimethoprim, chloramphenicol, quinupristin/dalfopristin by the disk diffusion method. PCR was used for the detection of antibiotic resistance genes encoding: methicillin resistance--mecA; macrolide resistance--erm(A), erm(B), erm(C), mrs(A/B); efflux proteins tet(K) and tet(L) and ribosomal protection proteins tet(M). For all the tet(M)-positive isolates the presence of conjugative transposons of the Tn916-Tn1545 family was determined. Most of the isolates were resistant to cefoxitin (41.3%) followed by clindamycin (36.2%), tigecycline (24.1%), rifampicin (17.2%) and erythromycin (13.8%). 32.2% staphylococcal isolates were multidrug resistant (MDR). All methicillin resistant staphylococci harboured mecA gene. Isolates, phenotypic resistant to tetracycline, harboured at least one tetracycline resistance determinant on which tet(M) was most frequent. All of the isolates positive for tet(M) genes were positive for the Tn916-Tn1545 -like integrase family gene. In the erythromycin-resistant isolates, the macrolide resistance genes erm(C) or msr(A/B) were present. Although coagulase-negative staphylococci are not classical food poisoning bacteria, its presence in food could be of public health significance due to the possible spread of antibiotic resistance. PMID:25475289

Chaj?cka-Wierzchowska, Wioleta; Zadernowska, Anna; Nalepa, Beata; Sierpi?ska, Magda; ?aniewska-Trokenheim, ?ucja

2015-04-01

482

Spectroscopic Studies of Some Phosphate Glasses with Molybdenum Ions  

NASA Astrophysics Data System (ADS)

The structure of xMoO3·(100-x)[2P2O5·PbO] glass system with 0?x?50 mol% is investigated by IR and Raman spectroscopies. The characteristic bands of the glass matrix [2P2O5·PbO] and MoO3 oxide due to the stretching and bending vibrations are identified. This allows us to identify the specific structural units which occur in these glasses and to deduce the role of the MoO3 oxide on the structural aspects of 2P2O5·PbO network. At high MoO3 content a depolymerization of the phosphate structure appears and the short phosphate chain units or ring structures are formed too.

Magdas, D. A.; Cozar, O.; Ardelean, I.; David, L.

483

Modification of network structure induced by glass former composition and its correlation to the conductivity in lithium borophosphate glass for solid state electrolyte  

Microsoft Academic Search

The xLi2O–(1?x)(yB2O3–(1?y)P2O5) glasses system is one of the parent compositions for chemically and electrochemically stable solid state electrolyte applicable to thin film battery. The purpose of this study was to seek an optimum composition maximizing the ionic conductivity for the deposition of thin film electrolytes. xLi2O–(1?x)(yB2O3–(1?y)P2O5) glasses were prepared with wide range of composition, i.e. x=0.40–0.47 and B2O3\\/(B2O3+P2O5) ratio was

Sunhwa Lee; Jisook Kim; Dongwook Shin

2007-01-01

484

WGS Catalysis and In Situ Studies of CoO1-x, PtCon/Co3O4, and PtmCom/CoO1-x Nanorod Catalysts  

E-print Network

WGS Catalysis and In Situ Studies of CoO1-x, PtCon/Co3O4, and PtmCom/CoO1-x Nanorod Catalysts of catalysts during catalysis using X-ray absorption spectroscopy, ambient pressure X-ray photo- electron by in situ studies of extended X-ray absorption fine structure spectroscopy. In the temperature range of 200

Frenkel, Anatoly