Sample records for call composition vary

  1. Syllable acoustics, temporal patterns, and call composition vary with behavioral context in Mexican free-tailed bats

    E-print Network

    Bohn, Kirsten

    Syllable acoustics, temporal patterns, and call composition vary with behavioral context in Mexican has shown that some bat species have rich vocal repertoires with diverse syllable acoustics. Few repertoire of Mexican free-tailed bats, T. brasiliensis, is presented. Syllable acoustics and temporal

  2. Receivers respond differently to chick-a-dee calls varying in note composition in Carolina chickadees, Poecile carolinensis

    Microsoft Academic Search

    TODD M. FREEBERG; JEFFREY R. LUCAS

    2002-01-01

    The chick-a-dee call of the avian genus Poecile is a structurally complex vocal system because it possesses a set of simple rules that governs how the notes of the call are ordered, and variable numbers of each of the note types strung together can generate an extraordinary number of unique calls. Whereas it has been hypothesized that chick-a-dee calls with

  3. Syllable acoustics, temporal patterns, and call composition vary with behavioral context in Mexican free-tailed bats

    PubMed Central

    Bohn, Kirsten M.; Schmidt-French, Barbara; Ma, Sean T.; Pollak, George D.

    2008-01-01

    Recent research has shown that some bat species have rich vocal repertoires with diverse syllable acoustics. Few studies, however, have compared vocalizations across different behavioral contexts or examined the temporal emission patterns of vocalizations. In this paper, a comprehensive examination of the vocal repertoire of Mexican free-tailed bats, T. brasiliensis, is presented. Syllable acoustics and temporal emission patterns for 16 types of vocalizations including courtship song revealed three main findings. First, although in some cases syllables are unique to specific calls, other syllables are shared among different calls. Second, entire calls associated with one behavior can be embedded into more complex vocalizations used in entirely different behavioral contexts. Third, when different calls are composed of similar syllables, distinctive temporal emission patterns may facilitate call recognition. These results indicate that syllable acoustics alone do not likely provide enough information for call recognition; rather, the acoustic context and temporal emission patterns of vocalizations may affect meaning. PMID:19045674

  4. From calls to communities: a model for time varying social networks

    E-print Network

    Laurent, Guillaume; Karsai, Márton

    2015-01-01

    Social interactions vary in time and appear to be driven by intrinsic mechanisms, which in turn shape the emerging structure of the social network. Large-scale empirical observations of social interaction structure have become possible only recently, and modelling their dynamics is an actual challenge. Here we propose a temporal network model which builds on the framework of activity-driven time-varying networks with memory. The model also integrates key mechanisms that drive the formation of social ties - social reinforcement, focal closure and cyclic closure, which have been shown to give rise to community structure and the global connectedness of the network. We compare the proposed model with a real-world time-varying network of mobile phone communication and show that they share several characteristics from heterogeneous degrees and weights to rich community structure. Further, the strong and weak ties that emerge from the model follow similar weight-topology correlations as real-world social networks, i...

  5. Does Mallard clutch size vary with landscape composition?

    USGS Publications Warehouse

    Ball, I.J.; Artmann, M.J.; Hoekman, S.T.

    2002-01-01

    We studied Mallards (Arias platyrhynchos) nesting in artificial nesting structures in northeastern North Dakota and compared clutch size between landscapes where proportion of cropland was either high (mean = 68.9%, cropland landscapes) or low (mean = 30.2%, grassland landscapes). Mallard clutch size was significantly related to nest initiation date and landscape composition. Mean clutch size, controlled for nest initiation date, was 1.24 ?? 0.33 SE eggs smaller on cropland landscapes than on grassland landscapes. Generality of this pattern across space, time, and type of nesting sites is unknown, as is causation. Demographic importance of variation in clutch size may be influenced by covariation with other demographic variables, such as nest success and abundance of breeding pairs, which also are negatively correlated with landscape proportion of cropland. We suggest that researchers examine relationships between clutch size and landscape composition in both structure-nesting and ground-nesting Mallards, in other geographic areas, and in other duck species.

  6. Model atmospheres for cool stars. [varying chemical composition

    NASA Technical Reports Server (NTRS)

    Johnson, H. R.

    1974-01-01

    This report contains an extensive series of model atmospheres for cool stars having a wide range in chemical composition. Model atmospheres (temperature, pressure, density, etc.) are tabulated, along with emergent energy flux distributions, limb darkening, and information on convection for selected models. The models are calculated under the usual assumptions of hydrostatic equilibrium, constancy of total energy flux (including transport both by radiation and convection) and local thermodynamic equilibrium. Some molecular and atomic line opacity is accounted for as a straight mean. While cool star atmospheres are regimes of complicated physical conditions, and these atmospheres are necessarily approximate, they should be useful for a number of kinds of spectral and atmospheric analysis.

  7. Human milk fatty acid composition from nine countries varies most in DHA

    Microsoft Academic Search

    Rebecca Yuhas; Kathryn Pramuk; Eric L. Lien

    2006-01-01

    Many published studies of breast milk FA composition are limited to populations from one or two countries. We aimed to examine\\u000a the degree to which FA compositions vary across a number of diverse populations. Because diet and maternal adipose stores\\u000a influence breast milk FA composition, differences in FA composition between groups most likely reflect habitual dietary differences.\\u000a Approximately 50 breast

  8. A Varying Coefficient Model to Measure the Effectiveness of Mass Media Anti-Smoking Campaigns in Generating Calls to a Quitline

    PubMed Central

    Bui, Quang M.; Huggins, Richard M.; Hwang, Wen-Han; White, Victoria; Erbas, Bircan

    2010-01-01

    Background Anti-smoking advertisements are an effective population-based smoking reduction strategy. The Quitline telephone service provides a first point of contact for adults considering quitting. Because of data complexity, the relationship between anti-smoking advertising placement, intensity, and time trends in total call volume is poorly understood. In this study we use a recently developed semi-varying coefficient model to elucidate this relationship. Methods Semi-varying coefficient models comprise parametric and nonparametric components. The model is fitted to the daily number of calls to Quitline in Victoria, Australia to estimate a nonparametric long-term trend and parametric terms for day-of-the-week effects and to clarify the relationship with target audience rating points (TARPs) for the Quit and nicotine replacement advertising campaigns. Results The number of calls to Quitline increased with the TARP value of both the Quit and other smoking cessation advertisement; the TARP values associated with the Quit program were almost twice as effective. The varying coefficient term was statistically significant for peak periods with little or no advertising. Conclusions Semi-varying coefficient models are useful for modeling public health data when there is little or no information on other factors related to the at-risk population. These models are well suited to modeling call volume to Quitline, because the varying coefficient allowed the underlying time trend to depend on fixed covariates that also vary with time, thereby explaining more of the variation in the call model. PMID:20827036

  9. Non destructive evaluation of adhesively bonded carbon fiber reinforced composite lap joints with varied bond quality

    NASA Astrophysics Data System (ADS)

    Vijayakumar, R. L.; Bhat, M. R.; Murthy, C. R. L.

    2012-05-01

    Structural adhesive bonding is widely used to execute assemblies in automobile and aerospace structures. The quality and reliability of these bonded joints must be ensured during service. In this context non destructive evaluation of these bonded structures play an important role. Evaluation of adhesively bonded composite single lap shear joints has been attempted through experimental approach. Series of tests, non-destructive as well as destructive were performed on different sets of carbon fiber reinforced polymer (CFRP) composite lap joint specimens with varied bond quality. Details of the experimental investigations carried out and the outcome are presented in this paper.

  10. Pheromone Production by an Invasive Bark Beetle Varies with Monoterpene Composition of its Naïve Host.

    PubMed

    Taft, Spencer; Najar, Ahmed; Erbilgin, Nadir

    2015-06-01

    The secondary chemistry of host plants can have cascading impacts on the establishment of new insect herbivore populations, their long-term population dynamics, and their invasion potential in novel habitats. Mountain pine beetle, Dendroctonus ponderosae Hopkins (Coleoptera: Curculionidae) has recently expanded its range into forests of jack pine, Pinus banksiana Lamb., in western Canada. We investigated whether variations in jack pine monoterpenes affect beetle pheromone production, as the primary components of the beetle's aggregation pheromone, (-)-trans-verbenol and anti-aggregation pheromone (-)-verbenone, are biosynthesized from the host monoterpene ?-pinene. Jack pine bolts were collected from five Canadian provinces east of the beetle's current range, live D. ponderosae were introduced into them, and their monoterpene compositions were characterized. Production of (-)-trans-verbenol and (-)-verbenone emitted by beetles was measured to determine whether pheromone production varies with monoterpene composition of jack pines. Depending on particular ratios of major monoterpenes in host phloem, jack pine could be classified into three monoterpenoid groups characterized by high amounts of (+)-?-pinene, 3-carene, or a more moderate blend of monoterpenes, and beetle pheromone production varied among these groups. Specifically, beetles reared in trees characterized by high (+)-?-pinene produced the most (-)-trans-verbenol and (-)-verbenone, while beetles in trees characterized by high 3-carene produced the least. Our results indicate that pheromone production by D. ponderosae will remain a significant aspect and important predictor of its survival and persistence in the boreal forest. PMID:26014128

  11. Organic Elemental Composition in Fingernail Plates Varies between Sexes and Changes with Increasing Age in Healthy Humans

    Microsoft Academic Search

    Manuela Dittmar; Willi Dindorf; Arun Banerjee

    2008-01-01

    Background: Keratin, an ?-helical fibrous protein, is the primary component of human nail plates. No data on age-related changes in healthy subjects are present. Objective: This study investigated whether keratin amount and composition, as indicated by organic elemental composition of fingernails, varies with aging and between sexes. Methods: Nail clippings from 225 healthy individuals (93 males, 132 females), aged 20–90

  12. Identification and characterization of transcript polymorphisms in soybean lines varying in oil composition and content

    PubMed Central

    2014-01-01

    Background Variation in seed oil composition and content among soybean varieties is largely attributed to differences in transcript sequences and/or transcript accumulation of oil production related genes in seeds. Discovery and analysis of sequence and expression variations in these genes will accelerate soybean oil quality improvement. Results In an effort to identify these variations, we sequenced the transcriptomes of soybean seeds from nine lines varying in oil composition and/or total oil content. Our results showed that 69,338 distinct transcripts from 32,885 annotated genes were expressed in seeds. A total of 8,037 transcript expression polymorphisms and 50,485 transcript sequence polymorphisms (48,792 SNPs and 1,693 small Indels) were identified among the lines. Effects of the transcript polymorphisms on their encoded protein sequences and functions were predicted. The studies also provided independent evidence that the lack of FAD2-1A gene activity and a non-synonymous SNP in the coding sequence of FAB2C caused elevated oleic acid and stearic acid levels in soybean lines M23 and FAM94-41, respectively. Conclusions As a proof-of-concept, we developed an integrated RNA-seq and bioinformatics approach to identify and functionally annotate transcript polymorphisms, and demonstrated its high effectiveness for discovery of genetic and transcript variations that result in altered oil quality traits. The collection of transcript polymorphisms coupled with their predicted functional effects will be a valuable asset for further discovery of genes, gene variants, and functional markers to improve soybean oil quality. PMID:24755115

  13. Compositional Controls on the Geological Behavior of Icy Satellites, and a Call for More Lab Data

    NASA Astrophysics Data System (ADS)

    Kargel, J. S.

    2006-12-01

    The tectonic, volcanic, and some other important types of geologic activity of solid planetary objects arises mainly from the differential partitioning and transport of thermal energy that produces rheological structures, density inversions, and unequilibrated pressure/stress gradients, thereby causing conditions that are prone to advective mass transfers and restabilization of stress conditions. The composition of icy satellites and solid planets determines the material properties of the condensed materials, and thus their physical responses to heating and virtually all geological processes. Many key mechanical and thermodynamic properties (e.g., melting temperature, effective viscosity, and thermal conductivity) vary across orders of magnitude among the volatile ices, silicates, metals, liquid solutions, gases, and other substances making up icy satellites. Given this wide range of material properties, it is easy to understand why there is so much variability in the appearance and geologic processes of icy satellites. However, another striking discovery are some key geological/morphological similarities among many satellites. There may be three explanations for their similar appearances. (1) Dissimilar materials and dissimilar satellite attributes and conditions may give rise to dissimilar features that merely appear to be similar but are actually produced by very different processes. (2) The icy satellites are actually made of very similar materials and have responded with roughly similar processes to make similar features. (3) The icy satellites are made of dissimilar materials and operate under disparate conditions, but nevertheless many of them tend to exhibit similar geological/geophysical processes so long as they are heated sufficiently. Examples may be cited that seem consistent with each of these explanations. Theoretical understanding and modeling of satellite differentiation, cryovolcanism, solid state diapirism, magnetic field induction, and other geologic and geophysical processes depends on adequate laboratory measurements of the physical and thermodynamic properties of ices, salts, silicates, brines, gases, and other materials making up icy satellites. Examples of existing measurements of solid/liquid phase equilibria, gas solubility in aqueous solutions, thermal conductivity of solids, and rheology of aqueous solutions, ices, and salts are shown, and theoretical applications to problems of cryovolcanism and tectonism on Enceladus and Titan are given. These applications, and comparisons to silicate systems controlling much about the geology of the terrestrial planets, suggest that the third explanation above may be a key to understanding strangely familiar landscapes on Titan and Enceladus. An insufficiency in our laboratory data and our compositional knowledge of icy satellites limits our understanding of those worlds.

  14. N 2 fixation in three perennial Trifolium species in experimental grasslands of varied plant species richness and composition

    Microsoft Academic Search

    Georg Carlsson; Cecilia Palmborg; Ari Jumpponen; Michael Scherer-Lorenzen; Peter Högberg; Kerstin Huss-Danell

    2009-01-01

    This study is the first to investigate quantitative effects of plant community composition and diversity on N2 fixation in legumes. N2 fixation in three perennial Trifolium species grown in field plots with varied number of neighbouring species was evaluated with the 15N natural abundance method (two field sites, several growing seasons, no N addition) and the isotope dilution method (one

  15. Sequential Monte Carlo simulation for composite power system reliability analysis with time varying loads

    Microsoft Academic Search

    A. Sankarakrishnan; R. Billinton

    1995-01-01

    The paper illustrates the development and utilization of an annual chronological load curve for each load bus in a composite generation and transmission system and a sequential Monte Carlo simulation approach for composite system reliability assessment. Antithetic variates as a variance reduction technique has been applied to the simulation model to increase the efficiency of the simulation. An approximate method

  16. Flavonoid composition and antioxidant activity of pigmented sorghums of varying genotypes 

    E-print Network

    Dykes, Linda

    2009-05-15

    A wide variety of sorghum genotypes with a pigmented pericarp were grown in varying environments and were analyzed for total phenols, condensed tannins, flavan-4-ols, and in vitro antioxidant activity. In addition, sorghum flavonoids were separated...

  17. Synthesis and Thermal Study of Cured Epoxy-Acrylate-Maleate, Unsaturated Polyester and Their Interpenetrating Networks of Varying Compositions

    Microsoft Academic Search

    P. K. Mer; P. H. Parsania

    2011-01-01

    Epoxy-acrylate-maleate of bisphenol-C (ECAM), unsaturated polyester resin of phthalic anhydride, maleic anhydride and propylene glycol (PMP) were synthesized. ECAM, PMP and their varying compositions (25–75 wt%) were cured using MEKP and cobalt naphthenate and characterized by IR, DSC and TGA techniques. Interpenetrating networks possess intermediate thermal stability of ECAM (300°C) and PMP (227°C) and followed single step degradation with fractional order

  18. Composites for bone repair: phosphate glass fibre reinforced PLA with varying fibre architecture.

    PubMed

    Ahmed, I; Jones, I A; Parsons, A J; Bernard, J; Farmer, J; Scotchford, C A; Walker, G S; Rudd, C D

    2011-08-01

    Internal fixation for bone fractures with rigid metallic plates, screws and pins is a proven operative technique. However, refracture's have been observed after rigid internal fixation with metal plates and plate fixation has been known to cause localised osteopenia under and near the plate. In the present study, resorbable composites comprising a PLA matrix reinforced with iron doped phosphate glass fibres were investigated. Non-woven random mat laminates of approximately 30% and 45% fibre volume fraction (V(f)) were produced, along with unidirectional and 0°-90° samples of approximately 20% V(f). The non-woven composite laminates achieved maximum values of 10 GPa modulus and 120 MPa strength. The 0-90º samples showed unexpectedly low strengths close to matrix value (~50 MPa) although with a modulus of 7 GPa. The UD specimens exhibited values of 130 MPa and 11.5 GPa for strength and modulus respectively. All the modulus values observed were close to that expected from the rule of mixtures. Samples immersed in deionised water at 37°C revealed rapid mechanical property loss, more so for the UD and 0-90º samples. It was suggested that continuous fibres wicked the degradation media into the composite plates which sped up the deterioration of the fibre-matrix interface. The effect was less pronounced in the non-woven random mat laminates due to the discontinuous arrangement of fibres within the composite, making it less prone to wicking. Random mat composites revealed a higher mass loss than the UD and 0°-90° specimens, it was suggested this was due to the higher fibre volume fractions of these composites and SEM studies revealed voidage around the fibres by day 3. Studies of pH of the degradation media showed similar profiles for all the composites investigated. An initial decrease in pH was attributed to the release of phosphate ions into solution followed by a gradual return back to neutral. PMID:21671001

  19. Subunit composition of AMPD varies in response to changes in AMPD1 and AMPD3 gene expression in skeletal muscle.

    PubMed

    Fortuin, F D; Morisaki, T; Holmes, E W

    1996-07-01

    Adenosine monophosphate deaminase (AMPD), a central enzyme in energy metabolism in skeletal muscle, is encoded by a multigene family in higher eukaryotes. Denervation was used as a stimulus to induce a change in fiber type composition of rat gastrocnemius muscle and, consequently, gene expression. Specific antisera and nucleic acid probes were used to assess changes in expression of the AMPD1 and AMPD3 genes. Total AMPD activity in denervated skeletal muscle increased by 34%. The composition of the AMPD tetrameric holoenzyme was altered in two ways: The percentage of AMPD holoenzyme molecules consisting of one or more AMPD3 subunits increased three-fold, and the percentage of AMPD1 mRNA that excludes exon 2-encoded sequences doubled. These results suggest that expression of the AMPD1 and AMPD3 genes may be coordinated in myocytes to effect production of an AMPD holoenzyme of varying subunit composition. PMID:8863347

  20. The Effect of Stochastically Varying Creep Parameters on Residual Stresses in Ceramic Matrix Composites

    NASA Technical Reports Server (NTRS)

    Pineda, Evan J.; Mital, Subodh K.; Bednarcyk, Brett A.; Arnold, Steven M.

    2015-01-01

    Constituent properties, along with volume fraction, have a first order effect on the microscale fields within a composite material and influence the macroscopic response. Therefore, there is a need to assess the significance of stochastic variation in the constituent properties of composites at the higher scales. The effect of variability in the parameters controlling the time-dependent behavior, in a unidirectional SCS-6 SiC fiber-reinforced RBSN matrix composite lamina, on the residual stresses induced during processing is investigated numerically. The generalized method of cells micromechanics theory is utilized to model the ceramic matrix composite lamina using a repeating unit cell. The primary creep phases of the constituents are approximated using a Norton-Bailey, steady state, power law creep model. The effect of residual stresses on the proportional limit stress and strain to failure of the composite is demonstrated. Monte Carlo simulations were conducted using a normal distribution for the power law parameters and the resulting residual stress distributions were predicted.

  1. FRIT DEVELOPMENT FOR HIGH LEVEL WASTE SLUDGE BATCH 5: COMPOSITIONAL TRENDS FOR VARYING ALUMINUM CONCENTRATIONS

    SciTech Connect

    Fox, K; Tommy Edwards; David Best; Irene Reamer; Phyllis Workman

    2008-08-28

    The objective of this study was to experimentally measure the properties and performance of a series of glasses with compositions that could represent Sludge Batch 5 (SB5) as processed at the Defense Waste Processing Facility (DWPF). The data was used to provide recommendations to the Liquid Waste Organization (LWO) regarding blending and washing strategies in preparing SB5 based on acceptability of the glass compositions. These data were also used to guide frit optimization efforts as the SB5 composition was finalized. Glass compositions for this study were developed by combining a series of SB5 composition projections with a group of frits. Three composition projections for SB5 were developed using a model-based approach at Savannah River National Laboratory (SRNL). These compositions, referred to as SB5 Cases B, C and D, projected removal of 25, 50 and 75% (respectively) of the aluminum in Tank 51 through the low temperature aluminum dissolution process. The frits for this study (Frits 530 through 537) were selected based on their predicted operating windows (i.e., ranges of waste loadings over which the predicted properties of the glasses were acceptable) and their potential (based on historical trends) to provide acceptable melt rates for SB5. Six additional glasses were designed to evaluate alternatives for uranium in DWPF-type glasses used for variability studies and some scoping studies. Since special measures are necessary when working with uranium-containing glasses in the laboratory, it is desirable as a cost and time saving measure to find an alternative for uranium to support frit optimization efforts. Hafnium and neodymium were investigated as potential surrogates for uranium, and other glasses were made by simply excluding the radioactive components and renormalizing the glass composition. The study glasses were fabricated and characterized at SRNL. Chemical composition analyses suggested only minor difficulties in meeting the targeted compositions for some of the oxides for some of the glasses. Although minor differences were observed, they did not have a significant impact on the conclusions made in this study. Several of the study compositions showed retention of more than 0.5 wt% SO{sub 4}{sup 2-} in glass. Trevorite (a spinel) was the only crystalline phase that was positively identified in a few of the study glasses after the canister centerline cooled (CCC) heat treatment. Spinels are not of concern as they have been shown to have little impact on the durability of high level waste glasses. The crystallization behavior of the surrogate glasses was generally the same as that of their U{sub 3}O{sub 8}-containing counterparts. There are two pairs that were exceptions: SB5-04 (amorphous) and SB5-24 (possible trevorite), along with SB5-07 (amorphous) and SB5-25 (trevorite). In these cases, the surrogate glasses (SB5-24 and SB5-25) appear to be more conservative (more prone to crystallization) than their U{sub 3}O{sub 8}-containing counterparts. Chemical durability was quantified using the Product Consistency Test (PCT). The normalized leachate (NL) values for B, Li, Na and Si for all of the study glasses were well below those of the Environmental Assessment (EA) benchmark glass, regardless of heat treatment or compositional view. This indicates that all of the glasses had very acceptable durability performance. The highest NL [B] for the study glasses was 0.914 g/L (the quenched version of glass SB5-13), normalized using the measured, bias-correct composition. There was little practical impact of the CCC heat treatment on the PCT responses of the study glasses. The measured PCT responses were predictable by the current {Delta}G{sub p} models. In general, the PCT responses for the surrogate glasses or the glasses without U{sub 3}O{sub 8} were quite similar to their U{sub 3}O{sub 8}-containing counterparts. The average percent error in NL [B] normalized by the measured, bias-corrected compositions for the surrogate glasses compared with their radioactive counterparts was 8.8%. The largest difference in NL

  2. Practical Analysis of materials with depth varying compositions using FT-IR photoacoustic spectroscopy (PAS)

    SciTech Connect

    J.F. McClelland; R.W. Jones; Siquan Luo

    2004-09-30

    FT-IR photoacoustic spectroscopy (PAS) is discussed as a nondestructive method to probe the molecular composition of materials versus depth on the basis of the analysis of layers of experimentally controllable thickness, which are measured from the sample surface to depths of some tens of micrometers, depending on optical and thermal properties. Computational methods are described to process photoacoustic amplitude and phase spectra for both semi-quantitative and quantitative depth analyses. These methods are demonstrated on layered and gradient samples.

  3. ¹H Nuclear Magnetic Resonance monitoring of the degradation of margarines of varied compositions when heated to high temperature.

    PubMed

    Ibargoitia, María L; Sopelana, P; Guillén, María D

    2014-12-15

    In this study, (1)H Nuclear Magnetic Resonance was used to monitor the evolution of three margarines of varied compositions when submitted to heating at 180°C in an oven with aeration. Heating causes degradation of polyunsaturated acyl groups and this depends not only on their unsaturation degree, but also on the concentration of the different acyl groups. The evolution of monounsaturated groups varies depending on the disappearance rate of the groups with higher unsaturation degree. Heat treatment also causes hydrolysis reactions that lead to a reduction in 1-monoglycerides and an increase in 1,2-diglycerides, especially in the margarines with higher water content, as well as degradation of some vegetable sterols. Different types of aldehydes and epoxides were identified and quantified, above all in the margarine with the highest proportion of polyunsaturated groups, especially linoleic; some of these are toxic, such as 4-hydroxy- and 4,5-epoxy-2-alkenals. PMID:25038657

  4. An evaluation of the effects of varying composition and processing on several encapsulating resins

    SciTech Connect

    Wischmann, K.B.; Thomas, E.V.

    1991-01-01

    This investigation describes how a statistically designed experiment can be useful to characterize the relationship between a fundamental material property such as the glass transition temperature, Tg, and various processing parameters, e.g. composition, cure time, and temperature. To illustrate, formulation weighing errors can have a dramatic affect on material properties such as thermal, mechanical, and electrical properties. The glass transition temperature was selected for monitoring because it represents the materials state of cure and it is relatively easy to determine. Specifically, EPON 828 systems cured with diethanolamine and Shell Z, respectively, were investigated plus a mixture of the latter that employed aluminum oxide as a filler. This investigation showed that Tg changed very little with cure temperature in the DEA system compared to Shell Z, whereas the latter system appeared to display synergistic effects contrary to the DEA system. In the filled formulation, loading level had very little effect on Tg. The significance of this study is that the relationship between Tg, the composition and processing factors can be used to help diagnose the cause of misprocessed material. 2 refs., 11 figs., 3 tabs.

  5. Modeled and Measured Dynamics of a Composite Beam with Periodically Varying Foam Core

    NASA Technical Reports Server (NTRS)

    Cabell, Randolph H.; Cano, Roberto J.; Schiller, Noah H.; Roberts Gary D.

    2012-01-01

    The dynamics of a sandwich beam with carbon fiber composite facesheets and foam core with periodic variations in material properties are studied. The purpose of the study is to compare finite element predictions with experimental measurements on fabricated beam specimens. For the study, three beams were fabricated: one with a compliant foam core, a second with a stiffer core, and a third with the two cores alternating down the length of the beam to create a periodic variation in properties. This periodic variation produces a bandgap in the frequency domain where vibrational energy does not readily propagate down the length of the beam. Mode shapes and natural frequencies are compared, as well as frequency responses from point force input to velocity response at the opposite end of the beam.

  6. The response of rat serum lipids to diets of varying composition or contaminated with organochlorine pesticides.

    PubMed

    Boll, M; Weber, L W; Stampfl, A

    1996-01-01

    The effects of different diets (high carbohydrate, high protein, high fat) and diets contaminated with polychlorinated biphenyls (PCBs) and/or gamma-hexachlorocyclohexane (lindane) on the levels of serum triglycerides, cholesterol and phospholipids were investigated in Wistar rats. Serum triglyceride levels differed significantly among the diets, while those of cholesterol and phospholipids were much less affected by the diet composition. A change in diet composition resulted in a gradual adaptation to the lipid levels characteristic of the new diet with major variations including oscillations. There was, however, no specific component of a diet that could be associated with any specific change in serum lipids. While feed deprivation decreased the serum lipids (40-65% in 3 days), refeeding the starved animals caused pronounced increases of the lipids that were different among the diets. The response of the triglyceride levels was the strongest (up to 10 times the starvation levels) followed by those of the phospholipids (4-fold) and cholesterol (2.5-fold). Response of the triglyceride levels peaked within 1 or 2 days of refeeding, whereas those of cholesterol and phospholipids took 4 days to reach the maximum. Feeding PCB-contaminated diets increased the serum lipids in a dose-dependent manner (15-250 ppm). Higher PCB concentrations were increasingly inhibitory (350 ppm) or overtly toxic (> 400 ppm). Elevated lipids returned to the starting levels immediately after peaking (triglycerides) or only after several days (cholesterol, phospholipids) but with an earlier onset at lower PCB concentrations. Refeeding starved animals with PCB-contaminated diets also increased the serum lipids dose-dependently. Feeding lindane-containing diets (50-150 ppm) as well as refeeding animals with lindane diets resulted in a considerable increase of the triglyceride levels, while cholesterol and phospholipids increased much less. Higher lindane concentrations (250 ppm) were inhibitory. The outcome on serum lipid levels on feeding diets contaminated with both PCBs and lindane was basically additive. PMID:8721217

  7. Oxygen Consumption Constrains Food Intake in Fish Fed Diets Varying in Essential Amino Acid Composition

    PubMed Central

    Saravanan, Subramanian; Geurden, Inge; Figueiredo-Silva, A. Cláudia; Nusantoro, Suluh; Kaushik, Sadasivam; Verreth, Johan; Schrama, Johan W.

    2013-01-01

    Compromisation of food intake when confronted with diets deficient in essential amino acids is a common response of fish and other animals, but the underlying physiological factors are poorly understood. We hypothesize that oxygen consumption of fish is a possible physiological factor constraining food intake. To verify, we assessed the food intake and oxygen consumption of rainbow trout fed to satiation with diets which differed in essential amino acid (methionine and lysine) compositions: a balanced vs. an imbalanced amino acid diet. Both diets were tested at two water oxygen levels: hypoxia vs. normoxia. Trout consumed 29% less food under hypoxia compared to normoxia (p<0.001). Under both hypoxia and normoxia trout significantly reduced food intake by 11% and 16% respectively when fed the imbalanced compared to the balanced amino acid diet. Oxygen consumption of the trout per unit body mass remained identical for both diet groups not only under hypoxia but also under normoxia (p>0.05). This difference in food intake between diets under normoxia together with the identical oxygen consumption supports the hypothesis that food intake in fish can be constrained by a set-point value of oxygen consumption, as seen here on a six-week time scale. PMID:23991148

  8. Proton radiotherapy dose perturbations caused by esophageal stents of varying material composition are negligible in an experimental model

    PubMed Central

    Jalaj, Sujai; Lee, Sang Yeob; McGaw, Camille; John, Bijo K; Li, Zuofeng; Awad, Ziad T; Scolapio, James S; Munoz, Juan C

    2015-01-01

    Background: Self-expanding metal and plastic esophageal stents (SEMS and SEPS, respectively) are used in conjunction with chemoradiation for palliation of malignant dysphagia. To date, the dosimetric effects of stents undergoing proton radiotherapy are not known. Study aim: To investigate the proton radiotherapy dose perturbations caused by esophageal stents of varying designs and materials undergoing external beam treatment for esophageal cancer. Patients and methods: Simulated clinical protocol. Solid acrylic phantom was used to mimic the esophageal tissue environment. Stents made of nitinol, stainless steel and polyester were tested. Proton beam dose of 2 Gy-E was delivered to each stent in a single anterior to posterior field. Film and image based evidence of dose perturbation were main outcomes measured. Results: Only the stainless steel and plastic stents demonstrated slight overall dose attenuations (–?0.5?% and –?0.4?%, respectively). All the nitinol-based stents demonstrated minimal overall dose perturbations ranging from 0.0?% to 1.2?%. Negligible dose perturbations were observed on each of the stent surfaces proximal to the radiation source, ranging from –?0.8?% (stainless steel stent) to 1.0?% (nitinol stent). Negligible dose effects were also observed on the distal surfaces of each stent ranging from –?0.5?% (plastic and stainless steel stents) to 1.0?% (nitinol stent). Conclusion: Proton radiotherapy dose perturbations caused by stents of varying designs and material composition are negligible. Negligible dose perturbation is in keeping with the inherent advantage of proton therapy over traditional radiotherapy composed of photons – given its relative large mass, protons have little side scatter.

  9. Bonobos extract meaning from call sequences.

    PubMed

    Clay, Zanna; Zuberbühler, Klaus

    2011-01-01

    Studies on language-trained bonobos have revealed their remarkable abilities in representational and communication tasks. Surprisingly, however, corresponding research into their natural communication has largely been neglected. We address this issue with a first playback study on the natural vocal behaviour of bonobos. Bonobos produce five acoustically distinct call types when finding food, which they regularly mix together into longer call sequences. We found that individual call types were relatively poor indicators of food quality, while context specificity was much greater at the call sequence level. We therefore investigated whether receivers could extract meaning about the quality of food encountered by the caller by integrating across different call sequences. We first trained four captive individuals to find two types of foods, kiwi (preferred) and apples (less preferred) at two different locations. We then conducted naturalistic playback experiments during which we broadcasted sequences of four calls, originally produced by a familiar individual responding to either kiwi or apples. All sequences contained the same number of calls but varied in the composition of call types. Following playbacks, we found that subjects devoted significantly more search effort to the field indicated by the call sequence. Rather than attending to individual calls, bonobos attended to the entire sequences to make inferences about the food encountered by a caller. These results provide the first empirical evidence that bonobos are able to extract information about external events by attending to vocal sequences of other individuals and highlight the importance of call combinations in their natural communication system. PMID:21556149

  10. Bonobos Extract Meaning from Call Sequences

    PubMed Central

    Clay, Zanna; Zuberbühler, Klaus

    2011-01-01

    Studies on language-trained bonobos have revealed their remarkable abilities in representational and communication tasks. Surprisingly, however, corresponding research into their natural communication has largely been neglected. We address this issue with a first playback study on the natural vocal behaviour of bonobos. Bonobos produce five acoustically distinct call types when finding food, which they regularly mix together into longer call sequences. We found that individual call types were relatively poor indicators of food quality, while context specificity was much greater at the call sequence level. We therefore investigated whether receivers could extract meaning about the quality of food encountered by the caller by integrating across different call sequences. We first trained four captive individuals to find two types of foods, kiwi (preferred) and apples (less preferred) at two different locations. We then conducted naturalistic playback experiments during which we broadcasted sequences of four calls, originally produced by a familiar individual responding to either kiwi or apples. All sequences contained the same number of calls but varied in the composition of call types. Following playbacks, we found that subjects devoted significantly more search effort to the field indicated by the call sequence. Rather than attending to individual calls, bonobos attended to the entire sequences to make inferences about the food encountered by a caller. These results provide the first empirical evidence that bonobos are able to extract information about external events by attending to vocal sequences of other individuals and highlight the importance of call combinations in their natural communication system. PMID:21556149

  11. Detection optimization of disbond in layered composites with varying thicknesses using an open-ended rectangular waveguide

    SciTech Connect

    Ganchev, S.; Qaddoumi, N.; Zoughi, R. [Colorado State Univ., Fort Collins, CO (United States)

    1994-12-31

    The detection of air disbond in layered dielectric composite, which is an important practical issue in many industries, is studied both theoretically and experimentally. Sensitivity of disbond detection depends on certain parameters, like the frequency of operation, the distance between the sensor and the first dielectric layer, and the layered composite geometry (conductor backed or terminated by an infinite half-space of air). The impact of all these parameters is investigated theoretically and then verified experimentally.

  12. Control of Ionic Polymer-Metal Composites for Active Catheter Systems via Linear Parameter-Varying Approach

    Microsoft Academic Search

    Hui-Hung Lin; Bo-Kai Fang; Ming-Shaung Ju; Chou-Ching K. Lin

    2009-01-01

    The ionic polymer metal composite (IPMC) is one type of electro-active material with the characteristics of low electric driving potential, large deformation, and aquatic manipulation. It is highly attractive to biomedical applications as an actuator or a sensor. The main purpose of this study is to explore closed-loop control schemes to an IPMC actuator for active catheter systems. In this

  13. Rhizosphere bacterial communities associated with long-lived perennial prairie plants vary in diversity, composition, and structure

    E-print Network

    Weiblen, George D

    composition, diversity, and structure among individual Andropogon gerardii Vitman (big bluestem) and Lespedeza microbial taxa on plant hosts and their roles in ecosystem functioning. Key words: Andropogon gerardii'espèce Andropogon gerardii Vitman (barbon de Gérard) et a` l'espèce Lespedeza capitata (trèfle arbustif). Les

  14. Growth and lipid composition of scallop juveniles, Placopecten magellanicus, fed the flagellate Isochrysis galbana with varying lipid composition and the diatom Chaetoceros muelleri

    Microsoft Academic Search

    C. C. Parrish; J. S. Wells; Z. Yang; P. Dabinett

    1999-01-01

    The effect of feeding the flagellate Isochrysis galbana (Parke; clone T-Iso) of modified lipid composition on the growth and lipid composition of juvenile scallops [Placopecten magellanicus (Gmelin)] was investigated in the spring of 1993. I. galbana grown in 85-liter cage culture turbidostats under conditions of nitrogen limitation had a significantly higher total lipid\\u000a content than when grown under nutrient-replete conditions.

  15. Carbon stable isotopic composition of soluble sugars in Tillandsia epiphytes varies in response to shifts in habitat

    Microsoft Academic Search

    Laurel K. Goode; Erik B. Erhardt; Louis S. Santiago; Michael F. Allen

    2010-01-01

    We studied C stable isotopic composition (?13C) of bulk leaf tissue and extracted sugars of four epiphytic Tillandsia species to investigate flexibility in the use of crassulacean acid metabolism (CAM) and C3 photosynthetic pathways. Plants growing in two seasonally dry tropical forest reserves in Mexico that differ in annual precipitation\\u000a were measured during wet and dry seasons, and among secondary,

  16. Different Assembly Processes Drive Shifts in Species and Functional Composition in Experimental Grasslands Varying in Sown Diversity and Community History

    PubMed Central

    Roscher, Christiane; Schumacher, Jens; Gerighausen, Uta; Schmid, Bernhard

    2014-01-01

    Background The prevalence of different biotic processes (limiting similarity, weaker competitor exclusion) and historical contingency due to priority effects are in the focus of ongoing discussions about community assembly and non-random functional trait distributions. Methodology/Principal Findings We experimentally manipulated assembly history in a grassland biodiversity experiment (Jena Experiment) by applying two factorially crossed split-plot treatments to all communities: (i) duration of weeding (never weeded since sowing or cessation of weeding after 3 or 6 years); (ii) seed addition (control vs. seed addition 4 years after sowing). Spontaneous colonization of new species in the control treatment without seed addition increased realized species richness and functional richness (FRic), indicating continuously denser packing of niches. Seed addition resulted in forced colonization and increased realized species richness, FRic, functional evenness (FEve) and functional divergence (FDiv), i.e. higher abundances of species with extreme trait values. Furthermore, the colonization of new species led to a decline in FEve through time, suggesting that weaker competitors were reduced in abundance or excluded. Communities with higher initial species richness or with longer time since cessation of weeding were more restricted in the entry of new species and showed smaller increases in FRic after seed addition than other communities. The two assembly-history treatments caused a divergence of species compositions within communities originally established with the same species. Communities originally established with different species converged in species richness and functional trait composition over time, but remained more distinct in species composition. Conclusions/Significance Contrasting biotic processes (limiting similarity, weaker competitor exclusion) increase functional convergence between communities initially established with different species. Historical contingency with regard to realized species compositions could not be eradicated by cessation of weeding or forced colonization and was still detectable 5 years after application of these treatments, providing evidence for the role of priority effects in community assembly. PMID:25029105

  17. Rhizosphere bacterial communities associated with long-lived perennial prairie plants vary in diversity, composition, and structure.

    PubMed

    Rosenzweig, N; Bradeen, J M; Tu, Z J; McKay, S J; Kinkel, L L

    2013-07-01

    The goal of this research was to investigate the variation in rhizosphere microbial community composition, diversity, and structure among individual Andropogon gerardii Vitman (big bluestem) and Lespedeza capitata Michx. (bush clover). Bacterial communities from the rhizosphere of 10 plants of each species (n = 20 plants total) were explored using a culture-independent pipeline. Microbial communities associated with both host plants had high bacterial diversity within individual plant rhizosphere and taxa unique to individual rhizospheres. Bacterial communities associated with the rhizosphere of A. gerardii were consistently more diverse than those associated with L. capitata, and there were significant differences between plant species in rhizosphere bacterial community composition. Differences included microbial taxa with no known functional relationship with their preferred host species, including sulfide-methylating obligate anaerobes (Holophaga), complete denitrifiers (Rhodoplanes), sludge inhabitants (Ktedonobacter), and nitrate oxidizers (Nitrospira). These results suggest the potential for plant species to have significant impacts on a broad array of ecosystem functions (e.g., cycling of carbon, nitrogen sulfurs, metals, and trace elements) via their selective impacts on soil microbes. However, sequence-based community analysis and the corresponding lack of intact microbial cultures limits understanding of the potential influences of enriched microbial taxa on plant hosts and their roles in ecosystem functioning. PMID:23826959

  18. A comparison of secondary organic aerosol (SOA) yields and composition from ozonolysis of monoterpenes at varying concentrations of NO2

    NASA Astrophysics Data System (ADS)

    Draper, D. C.; Farmer, D. K.; Desyaterik, Y.; Fry, J. L.

    2015-05-01

    The effect of NO2 on secondary organic aerosol (SOA) formation from ozonolysis of ?-pinene, ?-pinene, ?3-carene, and limonene was investigated using a dark flow-through reaction chamber. SOA mass yields were calculated for each monoterpene from ozonolysis with varying NO2 concentrations. Kinetics modeling of the first generation gas-phase chemistry suggests that differences in observed aerosol yields for different NO2 concentrations are consistent with NO3 formation and subsequent competition between O3 and NO3 to oxidize each monoterpene. ?-pinene was the only monoterpene studied that showed a systematic decrease in both aerosol number concentration and mass concentration with increasing [NO2]. ?-pinene and ?3-carene produced fewer particles at higher [NO2], but both retained moderate mass yields. Limonene exhibited both higher number concentrations and greater mass concentrations at higher [NO2]. SOA from each experiment was collected and analyzed by HPLC-ESI-MS, enabling comparisons between product distributions for each system. In general, the systems influenced by NO3 oxidation contained more high molecular weight products (MW >400 amu), suggesting the importance of oligomerization mechanisms in NO3-initiated SOA formation. ?-pinene, which showed anomalously low aerosol mass yields in the presence of NO2, showed no increase in these oligomer peaks, suggesting that lack of oligomer formation is a likely cause of ?-pinene's near 0% yields with NO3. Through direct comparisons of mixed-oxidant systems, this work suggests that NO3 is likely to dominate nighttime oxidation pathways in most regions with both biogenic and anthropogenic influences. Therefore, accurately constraining SOA yields from NO3 oxidation, which vary substantially with the VOC precursor, is essential in predicting nighttime aerosol production.

  19. Sediment accretion rates and sediment composition in Prairie Pothole wetlands under varying land use practices, Montana, United States

    USGS Publications Warehouse

    Preston, T.M.; Sojda, R.S.; Gleason, R.A.

    2013-01-01

    Increased sedimentation and nutrient cycle changes in Prairie Pothole Region wetlands associated with agriculture threaten the permanence and ecological functionality of these important resources. To determine the effects of land use on sedimentation and nutrient cycling, soil cores were analyzed for cesium-137 (137Cs), lead-210 (210Pb), and potassium-40 (40K) activities; textural composition; organic and inorganic carbon (C); and total nitrogen (N) from twelve wetlands surrounded by cropland, Conservation Reserve Program (CRP) lands, or native prairie uplands. Separate soil cores from nine of these wetlands were also analyzed for phosphorus (P), nitrate (NO3), and ammonium (NH4) concentrations. Wetlands surrounded by cropland had significantly greater linear sediment accretion rates than wetlands surrounded by CRP or native prairie. Linear sediment accretion rates from wetlands surrounded by cropland were 2.7 and 6 times greater than wetlands surrounded by native prairie when calculated from the initial and peak occurrence of 137Cs, respectively, and 0.15 cm y?1 (0.06 in yr?1) greater when calculated from 210Pb. Relative to wetlands surrounded by CRP, linear sediment accretion rates for wetlands surrounded by cropland were 4.4 times greater when calculated from the peak occurrence of 137Cs. No significant differences existed between the linear sediment accretion rates between wetlands surrounded by native prairie or CRP uplands. Wetlands surrounded by cropland had increased clay, P, NO3, and NH4, and decreased total C and N concentrations compared to wetlands surrounded by native prairie. Wetlands surrounded by CRP had the lowest P and NO3 concentrations and had clay, NH4, C, and N concentrations between those of cropland and native prairie wetlands. We documented increased linear sediment accretion rates and changes in the textural and chemical properties of sediments in wetlands with cultivated uplands relative to wetlands with native prairie uplands. These findings demonstrate the value of the CRP at protecting wetland catchments to reduce sedimentation.

  20. Urea metabolism in beef steers grazing bermudagrass, caucasian bluestem, or gamagrass pastures varying in plant morphology, protein content, and protein composition.

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Our objective was to evaluate pastures of bermudagrass (Cynodon dactylon, BG), caucasian bluestem (Bothriochloa caucasica, CBS), and gamagrass (Tripsacum dactyloides, GG) from the perspectives of forage composition, selection during grazing, and N metabolism in beef steers. All pastures were ferti...

  1. Torpor patterns of hibernating eastern chipmunks Tamias striatus vary in response to the size and fatty acid composition of food hoards

    Microsoft Academic Search

    DANIEL MUNRO; DONALD W. THOMAS; MURRAY M. HUMPHRIES

    2005-01-01

    Summary 1. Many endotherms employ torpor during periods of resource scarcity, but this state of substantially reduced body temperature and metabolism appears to impose significant physiological costs. Accordingly, individuals can be expected to vary the expression of torpor according to the size of their energy reserves. 2. Although dietary polyunsaturated fatty acids (PUFAs) are important for maintain- ing the fluidity

  2. The dynamics of top-down and bottom-up effects in food webs of varying prey diversity, composition, and productivity

    Microsoft Academic Search

    Jeremy W. Fox

    2007-01-01

    Prey diversity is thought to mediate the strength of top-down and bottom-up effects, but few experiments directly test this hypothesis. I assembled food webs of bacteria and bacterivorous protist prey in laboratory microcosms with all combinations of five productivity levels, two top predator treatments (present or absent), and three prey compositions. Depauperate food chains contained one of two edible prey

  3. Ultradeep 16S rRNA Sequencing Analysis of Geographically Similar but Diverse Unexplored Marine Samples Reveal Varied Bacterial Community Composition

    PubMed Central

    Karutha Pandian, Shunmugiah

    2013-01-01

    Background Bacterial community composition in the marine environment differs from one geographical location to another. Reports that delineate the bacterial diversity of different marine samples from geographically similar location are limited. The present study aims to understand whether the bacterial community compositions from different marine samples harbour similar bacterial diversity since these are geographically related to each other. Methods and Principal Findings In the present study, 16S rRNA deep sequencing analysis targeting V3 region was performed using Illumina bar coded sequencing. A total of 22.44 million paired end reads were obtained from the metagenomic DNA of Marine sediment, Rhizosphere sediment, Seawater and the epibacterial DNA of Seaweed and Seagrass. Diversity index analysis revealed that Marine sediment has the highest bacterial diversity and the least bacterial diversity was observed in Rhizosphere sediment. Proteobacteria, Actinobacteria and Bacteroidetes were the dominant taxa present in all the marine samples. Nearly 62–71% of rare species were identified in all the samples and most of these rare species were unique to a particular sample. Further taxonomic assignment at the phylum and genus level revealed that the bacterial community compositions differ among the samples. Conclusion This is the first report that supports the fact that, bacterial community composition is specific for specific samples irrespective of its similar geographical location. Existence of specific bacterial community for each sample may drive overall difference in bacterial structural composition of each sample. Further studies like whole metagenomic sequencing will throw more insights to the key stone players and its interconnecting metabolic pathways. In addition, this is one of the very few reports that depicts the unexplored bacterial diversity of marine samples (Marine sediment, Rhizosphere sediment, Seawater) and the host associated marine samples (Seaweed and Seagrass) at higher depths from uncharacterised coastal region of Palk Bay, India using next generation sequencing technology. PMID:24167548

  4. Temporal Fluctuations in Suicide Calls to a Crisis Intervention Service.

    ERIC Educational Resources Information Center

    Noble, Ronald Eugene Stuart

    1996-01-01

    An analysis of suicide-related calls received by a crisis center indicates that the overall number of calls varied by both month and day of the week. Suicide ideation calls, and calls involving a suicide attempt, varied by day of the month. Results could be used in scheduling crisis center staff. (RJM)

  5. Nectar-carbohydrate production and composition vary in relation to nectary anatomy and location within individual flowers of several species of Brassicaceae

    Microsoft Academic Search

    Arthur R. Davis; Jeffrey D. Pylatuik; Joelle C. Paradis; Nicholas H. Low

    1998-01-01

    .   Nectar-carbohydrate production and composition were investigated by high-performance liquid chromatography and enzymology\\u000a in nine species from five tribes of the Brassicaceae. In six species (Arabidopsis thaliana (L.) Heynh., Brassica napus L., B. rapa L., Lobularia maritima (L.) Desv., Raphanus sativus L., Sinapis arvensis L.) that produced nectar from both lateral nectaries (associated with the short stamens) and median nectaries

  6. Head-group acylation of monogalactosyldiacylglycerol is a common stress response, and the acyl-galactose acyl composition varies with the plant species and applied stress.

    PubMed

    Vu, Hieu Sy; Roth, Mary R; Tamura, Pamela; Samarakoon, Thilani; Shiva, Sunitha; Honey, Samuel; Lowe, Kaleb; Schmelz, Eric A; Williams, Todd D; Welti, Ruth

    2014-04-01

    Formation of galactose-acylated monogalactosyldiacylglycerols has been shown to be induced by leaf homogenization, mechanical wounding, avirulent bacterial infection and thawing after snap-freezing. Here, lipidomic analysis using mass spectrometry showed that galactose-acylated monogalactosyldiacylglycerols, formed in wheat (Triticum aestivum) and tomato (Solanum lycopersicum) leaves upon wounding, have acyl-galactose profiles that differ from those of wounded Arabidopsis thaliana, indicating that different plant species accumulate different acyl-galactose components in response to the same stress. Additionally, the composition of the acyl-galactose component of Arabidopsis acMGDG (galactose-acylated monogalactosyldiacylglycerol) depends on the stress treatment. After sub-lethal freezing treatment, acMGDG contained mainly non-oxidized fatty acids esterified to galactose, whereas mostly oxidized fatty acids accumulated on galactose after wounding or bacterial infection. Compositional data are consistent with acMGDG being formed in vivo by transacylation with fatty acids from digalactosyldiacylglycerols. Oxophytodienoic acid, an oxidized fatty acid, was more concentrated on the galactosyl ring of acylated monogalactosyldiacylglycerols than in galactolipids in general. Also, oxidized fatty acid-containing acylated monogalactosyldiacylglycerols increased cumulatively when wounded Arabidopsis leaves were wounded again. These findings suggest that, in Arabidopsis, the pool of galactose-acylated monogalactosyldiacylglycerols may serve to sequester oxidized fatty acids during stress responses. PMID:24286212

  7. Integrated literature review of postdischarge telephone calls.

    PubMed

    Bahr, Sarah J; Solverson, Susan; Schlidt, Andrea; Hack, Deborah; Smith, Jeri Lynn; Ryan, Polly

    2014-01-01

    This systematic review of the literature assessed the impact of a postdischarge telephone call on patient outcomes. Nineteen articles met inclusion criteria. Data were extracted and an evidence table was developed. The content, timing, and professional placing the call varied across studies. Study strength was low and findings were inconsistent. Measures varied across studies, many sample sizes were small, and studies differed by patient population. Evidence is inconclusive for use of phone calls to decrease readmission, emergency department use, patient satisfaction, scheduled and unscheduled follow-up, and physical and emotional well-being. Among these studies, there was limited support for medication-focused calls by pharmacists but no support for decreasing readmission. Health care providers benefited from feedback but did not need to place the call to realize this benefit. Inpatient nurses were unable to manage the volume of calls. There was no standardized approach to the call, training, or documentation requirements. PMID:23833254

  8. Binding of the Biogenic Polyamines to Deoxyribonucleic Acids of Varying Base Composition: Base Specificity and the Associated Energetics of the Interaction

    PubMed Central

    Kabir, Ayesha; Suresh Kumar, Gopinatha

    2013-01-01

    Background The thermodynamics of the base pair specificity of the binding of the polyamines spermine, spermidine, putrescine, and cadaverine with three genomic DNAs Clostridium perfringens, 27% GC, Escherichia coli, 50% GC and Micrococcus lysodeikticus, 72% GC have been studied using titration calorimetry and the data supplemented with melting studies, ethidium displacement and circular dichroism spectroscopy results. Methodology/Principal Findings Isothermal titration calorimetry, differential scanning calorimetry, optical melting studies, ethidium displacement, circular dichroism spectroscopy are the various techniques employed to characterize the interaction of four polyamines, spermine, spermidine, putersine and cadaverine with the DNAs. Polyamines bound stronger with AT rich DNA compared to the GC rich DNA and the binding varied depending on the charge on the polyamine as spermine>spermidine >putrescine>cadaverine. Thermodynamics of the interaction revealed that the binding was entropy driven with small enthalpy contribution. The binding was influenced by salt concentration suggesting the contribution from electrostatic forces to the Gibbs energy of binding to be the dominant contributor. Each system studied exhibited enthalpy-entropy compensation. The negative heat capacity changes suggested a role for hydrophobic interactions which may arise due to the non polar interactions between DNA and polyamines. Conclusion/Significance From a thermodynamic analysis, the AT base specificity of polyamines to DNAs has been elucidated for the first time and supplemented by structural studies. PMID:23894663

  9. Effect of dietary fatty acid supplements, varying in fatty acid composition, on milk fat secretion in dairy cattle fed diets supplemented to less than 3% total fatty acids.

    PubMed

    Stoffel, C M; Crump, P M; Armentano, L E

    2015-01-01

    Dietary fatty acids can affect both milk fat yield and fatty acid (FA) composition. This relationship is well established when the dietary level of FA exceeds 3% of diet dry matter (DM). We could find no reports directly examining the effects of dietary FA profile on milk fat at levels below 3%. Twenty-four primiparous and 36 multiparous lactating cows were paired by production (1 high with 1 low, within parity) to form 30 experimental units. Pairs were fed 6 diets in five 6×6 balanced Latin squares with 21-d periods, and data were collected during the last 5d of each period. Two control diets were fed: a corn control diet (CC; 29% corn silage, 16% alfalfa silage, 19% corn grain, and 8% distillers grain on a DM basis) containing 1.8% FA; and a low-oil control diet (LOC; 9% corn silage, 35% alfalfa silage, 20% food-grade corn starch, and 8% corn gluten feed on a DM basis) containing 1.2% FA. A portion of the food-grade corn starch in LOC was replaced with 4 different FA supplements to create the 4 treatment diets. Treatments were 1.7% (DM basis) of a 50:50 blend of corn oil and high-linoleic safflower oil (LO), 1.7% high-oleic sunflower oil (OO), 1.7% palm oil (PO), or 1.8% calcium salts of palm fatty acids (PFA). The resultant diets were thus enriched in linoleic (LO), oleic (OO), or palmitic acid (PO and PFA). Dietary treatments did not affect dry matter intake. Addition of any of the fat sources to LOC resulted in increased milk yield, but milk fat yields and milk FA composition were variable for the different treatments. The LO treatment resulted in lower milk fat yield, fat concentration, and C16:0 yield but increased both trans-10 C18:1 and trans-10,cis-12 C18:2 yields compared with the other added FA treatments. Diets PO and PFA resulted in increased milk C16:0 yield and decreased total milk C18 yield compared with OO. Regression analysis revealed a negative coefficient for dietary linoleic acid content over basal (LOC) for both milk short-chain FA yield and C16:0 yield. Dietary linoleic acid content also had a positive coefficient for milk trans-10 C18:1 and trans-10,cis-12 conjugated linoleic acid yield. These results demonstrate that even when total dietary FA are below 3%, free oils rich in linoleic acid can reduce milk fat yield by reducing secretion of milk FA with fewer than 18 carbons. Fatty acid composition of fat supplements is important even at this low level of total dietary fat. PMID:25468700

  10. Sex and cognitive dietary restraint influence cholecystokinin release and satiety in response to preloads varying in fatty acid composition and content.

    PubMed

    Burton-Freeman, Britt

    2005-06-01

    The aim of the study was to evaluate the effect of preloads differing in fatty acid composition, content, and delivery form on acute behavioral, subjective, and biological outcomes of satiety. Four energy- and volume-matched preloads were tested in normal weight men and women (n = 12 and 13, respectively), using a random, crossover design. Preloads were semisolid shakes differing in fat source [walnut or safflower (SAFF)], delivery [ground walnuts (WNT) or walnut oil (WOL)] or content [39% fat energy (SAFF, WNT, WOL) or 4% low-fat control (LFC)]. Blood was collected and subjective satiety assessed at 0 (fasting), 15, 30, and 45 min after preload consumption. Lunch (test meal) was provided thereafter. Energy intake at lunch was not affected by preload; however, subjects selected more carbohydrate, fiber-rich foods at the test meal lunch after walnut preloads than after LFC or SAFF preloads. Compared with the LFC preload, appetite satisfaction was significantly greater after SAFF and WNT, but not after WOL. Women were hungrier after SAFF than after WOL, whereas men were less hungry after SAFF and LFC than after WOL or WNT. Plasma cholecystokinin (CCK) concentrations reflected preload fat content and availability, particularly among men; CCK was higher after WOL and SAFF preloads than after LFC or WNT preloads. Plasma insulin was higher after LFC and SAFF preloads, corresponding to hunger suppression in men. Dietary restraint was associated with a blunted CCK response to preloads, whereas insulin was not affected by restraint. The results indicate that test meal energy intake after preloads containing approximately 40% walnut or safflower fat or 4% fat did not differ; however, walnut consumption may promote food patterns consistent with consuming diets higher in fiber. PMID:15930445

  11. Reduction of an E. coli O157:H7 and Salmonella composite on fresh strawberries by varying antimicrobial washes and vacuum perfusion.

    PubMed

    Gurtler, Joshua B; Bailey, Rebecca B; Jin, Tony Z; Fan, Xuetong

    2014-10-17

    A 2011 outbreak of hemorrhagic colitis, which resulted in the death of two individuals, was associated with contaminated strawberries. A study was conducted to identify antimicrobial washes effective at reducing E. coli O157:H7 and Salmonella enterica from the surface of fresh whole strawberries during two-minute immersion washes. Twenty-seven antimicrobial treatments were tested. Vacuum perfusion was applied to strawberries during chlorine and peracetic acid treatments to promote infiltration of sanitizer into porous strawberry tissue. Strawberries were inoculated to 7.1logCFU/strawberry with a seven-strain bacterial composite, consisting of three strains of E. coli O157:H7 and four serovars of Salmonella enterica. Berries were air-dried for 2h and immersed in circulating antimicrobial solutions for 120s at 22°C. Four treatments reduced ?3.0logCFU/strawberry, including (a) 1% acetic acid+1% H2O2, (b) 30% ethanol+1% H2O2, (c) 90ppm peracetic acid, and (d) 1% lactic acid+1% H2O2. Two additional treatments that reduced 2.8logCFU/strawberry were (a) 40% ethanol, and (b) 1% each of phosphoric+fumaric acids. Eight treatments reduced 2.0-2.6logCFU/strawberry. Five treatments reduced <1.45CFU/strawberry, including (a) 1% citric acid, (b) 1% lactic acid, (c) 1% acetic acid, (d) 0.5% each of acetic+citric acids and (e) 0.5% each of acetic+lactic acids. The use of vacuum perfusion with 200ppm chlorine or 90ppm peracetic acid did not reduce greater populations of pathogens than did the same treatments without vacuum perfusion. Fourteen treatments reduced no more pathogens (p<0.05) than did sterile deionized water. Results from this study provide some options for end-point decontamination of strawberries for retail operations just prior to serving to customers. PMID:25146462

  12. Composition.

    ERIC Educational Resources Information Center

    Nemanich, Donald, Ed.

    1974-01-01

    The articles in this special issue of the "Illinois English Bulletin" concern the state of composition instruction at the secondary and college levels. The titles and authors are "Monologues or Dialogues? A Plea for Literacy" by Dr. Alfred J. Lindsey, "Teaching Composition: Curiouser and Curiouser" by Denny Brandon, and "Teaching Writing to High…

  13. Nectar-carbohydrate production and composition vary in relation to nectary anatomy and location within individual flowers of several species of Brassicaceae.

    PubMed

    Davis, A R; Pylatuik, J D; Paradis, J C; Low, N H

    1998-06-01

    Nectar-carbohydrate production and composition were investigated by high-performance liquid chromatography and enzymology in nine species from five tribes of the Brassicaceae. In six species (Arabidopsis thaliana (L.) Heynh., Brassica napus L., B. rapa L., Lobularia maritima (L.) Desv., Raphanus sativus L., Sinapis arvensis L.) that produced nectar from both lateral nectaries (associated with the short stamens) and median nectaries (outside the long stamens), on average 95% of the total nectar carbohydrate was collected from the lateral ones. Nectar from these glands possessed a higher glucose/fructose ratio (usually 1.0-1.2) than that from the median nectaries (0.2-0.9) within the same flower. Comparatively little sucrose was detected in any nectar samples except from Matthiola bicornus (Sibth. et Sm.) DC., which possessed lateral nectaries only and produced a sucrose-dominant exudate. The anatomy of the nectarial tissue in nectar-secreting flowers of six species, Hesperis matronalis L., L. maritima, M. bicornus, R. sativus, S. arvensis, and Sisymbrium loeselii L., was studied by light and scanning-electron microscopy. Phloem alone supplied the nectaries. However, in accordance with their overall nectar-carbohydrate production, the lateral glands received relatively rich quantities of phloem that penetrated far into the glandular tissue, whereas median glands were supplied with phloem that often barely innervated them. All nectarial tissue possessed modified stomata (with the exception of the median glands of S. loeselii, which did not produce nectar); further evidence was gathered to indicate that these structures do not regulate nectar flow by guard-cell movements. The numbers of modified stomata per gland showed no relation to nectar-carbohydrate production. Taken together, the data on nectar biochemistry and nectary anatomy indicate the existence of two distinct nectary types in those Brassicacean species that possess both lateral and median nectaries, regardless of whether nectarial tissue is united around the entire receptacle or not. It is proposed that the term "nectarium" be used to represent collectively the multiple nectaries that can be found in individual flowers. PMID:9637073

  14. Call Admission Control for Mobile Multimedia Wireless Networks

    Microsoft Academic Search

    Sundus Mahmod; Harsha Sirisena; Krzysztof Pawlikowski

    Call Admission Control (CAC) policies in mobile cellular wireless networks give priority to handoff requests over new call requests. In the guard channel policy, an integer number of channels are reserved for handoff calls, while the fractional guard channel policy rejects new calls with a probability that varies with the current channel occupancy. The effect of reservations on new and

  15. BOMB THREAT CALL PROCEDURES

    E-print Network

    Guo, Ting

    _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ BOMB THREAT CALL PROCEDURES BOMB THREAT CHECKLIST Date: Time: Time Caller Phone Number Where Hung Up: Call Received:Most bomb threats are received by phone. Bomb threats are serious until proven otherwise. Act

  16. Exposures Information Totals Calls

    E-print Network

    Oliver, Douglas L.

    Information Call Type Totals Calls 2010: 30,979 2011: 29,916 #12;0 500 1000 1500 2000 2500 3000 3500 1 2 3 4 5 Fatalities 17.5 #12;CT Health Care Facility Initiated Calls 2011 2010 Bridgeport Hospital 181 152 St. Vincent's Hospital 215 189 Bristol Hospital 192 168 Danbury Hospital 211 172 Griffin Hospital 96 103 John Dempsey

  17. Composites

    NASA Astrophysics Data System (ADS)

    Chmielewski, M.; Nosewicz, S.; Pietrzak, K.; Rojek, J.; Strojny-N?dza, A.; Mackiewicz, S.; Dutkiewicz, J.

    2014-11-01

    It is commonly known that the properties of sintered materials are strongly related to technological conditions of the densification process. This paper shows the sintering behavior of a NiAl-Al2O3 composite, and its individual components sintered separately. Each kind of material was processed via the powder metallurgy route (hot pressing). The progress of sintering at different stages of the process was tested. Changes in the microstructure were examined using scanning and transmission electron microscopy. Metal-ceramics interface was clean and no additional phases were detected. Correlation between the microstructure, density, and mechanical properties of the sintered materials was analyzed. The values of elastic constants of NiAl/Al2O3 were close to intermetallic ones due to the volume content of the NiAl phase particularly at low densities, where small alumina particles had no impact on the composite's stiffness. The influence of the external pressure of 30 MPa seemed crucial for obtaining satisfactory stiffness for three kinds of the studied materials which were characterized by a high dense microstructure with a low number of isolated spherical pores.

  18. Callings and Organizational Behavior

    ERIC Educational Resources Information Center

    Elangovan, A. R.; Pinder, Craig C.; McLean, Murdith

    2010-01-01

    Current literature on careers, social identity and meaning in work tends to understate the multiplicity, historical significance, and nuances of the concept of calling(s). In this article, we trace the evolution of the concept from its religious roots into secular realms and develop a typology of interpretations using occupation and religious…

  19. The Power of CALL.

    ERIC Educational Resources Information Center

    Pennington, Martha C., Ed.

    The book provides an overview of Computer-Assisted Language Learning (CALL) written by specialists in specific areas of electronic media. Its nine chapters include: "The Power of the Computer in Language Education" (Martha C. Pennington); "Elements of CALL Methodology: Development, Evaluation, and Implementation" (Philip L. Hubbard); "Second…

  20. Time-Varying Gravitomagnetism

    E-print Network

    Bahram Mashhoon

    2008-03-12

    Time-varying gravitomagnetic fields are considered within the linear post-Newtonian approach to general relativity. A simple model is developed in which the gravitomagnetic field of a localized mass-energy current varies linearly with time. The implications of this temporal variation of the source for the precession of test gyroscopes and the motion of null rays are briefly discussed.

  1. Lightweight Remote Procedure Call

    Microsoft Academic Search

    Brian N. Bershad; Thomas E. Anderson; Edward D. Lazowska; Henry M. Levy

    1989-01-01

    Lightweight Remote Procedure Call (LRPC) is a com- munication facility designed and optimized for commu- nication between protection domains on the (same ma- chine. In contemporary small-kernel operating systems, ex- isting RPC systems incur an unnecessarily high cost when used for the type of communication that pre- dominates - between protection domains on the same machine. This cost leads system

  2. Lightweight remote procedure call

    Microsoft Academic Search

    Brian N. Bershad; Thomas E. Anderson; Edward D. Lazowska; Henry M. Levy

    1990-01-01

    Lightweight Remote Procedure Call (LRPC) is a communication facility designed and optimized for communication between protection domains on the same machine. In contemporary small-kernel operating systems, existing RPC systems incur an unnecessarily high cost when used for the type of communication that predominates—between protection domains on the same machine. This cost leads system designers to coalesce weakly related subsystems into

  3. Wake-Up Call.

    ERIC Educational Resources Information Center

    Sartorius, Tara Cady

    2002-01-01

    Focuses on the artist, Laquita Thomson, whose inspiration are the stars and space. Discusses her series called, "Celestial Happenings: Stars Fell on Alabama." Describes one event that inspired an art work when a meteor crashed into an Alabama home. Includes lessons for various subject areas. (CMK)

  4. BOMB THREAT CALL PROCEDURES

    E-print Network

    Boyce, Richard L.

    BOMB THREAT CALL PROCEDURES WHO TO CONTACT (select one) · Follow your local guidelines · Federal Protective Service (FPS) Police 1-877-4-FPS-411 (1-877-437-7411) · 911 Most bomb threats are received by phone. Bomb threats are serious until proven otherwise. Act quickly, but remain calm and obtain

  5. Call of the Wild

    NSDL National Science Digital Library

    Mrs. Whaley

    2009-04-19

    Objective: Students will evaluate informational text and build background knowledge about the American Author Jack London. Procedures: Click on the links below and read the biographical information about Jack London, the historical time period in which he wrote, and his writing by reading a few excerpts from Call of The Wild, Sea Wolf, and more tales. London is highly demanding on his readers; ...

  6. When Crises Call

    ERIC Educational Resources Information Center

    Kisch, Marian

    2012-01-01

    Natural disasters, as well as crises of the man-made variety, call on leaders of school districts to manage scenarios impossible to predict and for which no amount of training can adequately prepare. One thing all major crises hold in common is their far-reaching effects, which can run the gamut from personal safety and mental well-being to the…

  7. Partitioning a Call Graph

    Microsoft Academic Search

    RH Bisseling; J. Byrka; S. Cerav-Erbas; N. Gvozdenovic; M. Lorenz; RA Pendavingh; CR Reeves; M. Röger; A. Verhoeven; Berg van den J. B

    2006-01-01

    Splitting a large software system into smaller and more manageable units has become an important problem for many organizations. The basic structure of a software system is given by a directed graph with vertices representing the pro- grams of the system and arcs representing calls from one program to another. Generating a good partitioning into smaller modules becomes a minimization

  8. Call for action.

    PubMed

    Moore, Kathy

    2015-07-10

    AT RCN congress in Bournemouth last month, I presented a resolution calling on council to put pressure on the UK governments to address the crisis in the emergency care service. This was presented on behalf of the East Dorset branch. PMID:26159338

  9. Comparison of acid-detergent lignin, alkaline-peroxide lignin, and acid-detergent insoluble ash as internal markers for predicting fecal output and digestibility by cattle offered bermudagrass hays of varying nutrient composition

    PubMed Central

    2014-01-01

    Background The potential for acid-detergent insoluble ash (ADIA), alkaline-peroxide lignin (APL), and acid-detergent lignin (ADL) to predict fecal output (FO) and dry matter digestibility (DMD) by cattle offered bermudagrass [Cynodon dactylon (L.) Pers.] hays of different qualities was evaluated. Eight ruminally cannulated cows (594?±?35.5 kg) were allocated randomly to 4 hay diets: low (L), medium low (ML), medium high (MH), and high (H) crude protein (CP) concentration (79, 111, 131, and 164 g CP/kg on a DM basis, respectively). Diets were offered in 3 periods with 2 diet replicates per period and were rotated across cows between periods. Cows were individually fed 20 g DM/kg of body weight in equal feedings at 08:00 and 16:00 h for a 10-d adaptation followed by a 5-d total fecal collection. Actual DM intake (DMI), DMD, and FO were determined based on hay offered, ort, and feces excreted. These components were then analyzed for ADL, APL, and ADIA concentration to determine marker recovery and marker-based estimates of FO and DMD. Results Forage DMI was affected by diet (P =?0.02), and DMI from MH and H was greater (P varying nutrient composition. These internal markers may facilitate studies involving large numbers of animals and forages. Results from such studies may be used to develop improved equations to predict energy values of forages based on the relationship of dietary components to digestibility across a wide range of forages. PMID:24418569

  10. Varying-{alpha} monopoles

    SciTech Connect

    Menezes, J.; Avelino, P.P.; Santos, C. [Centro de Fisica do Porto e Departamento de Fisica da Faculdade de Ciencias da Universidade do Porto, Rua do Campo Alegre 687, 4169-007, Porto (Portugal)

    2005-11-15

    We study static magnetic monopoles in the context of varying-{alpha} theories and show that there is a group of models for which the 't Hooft-Polyakov solution is still valid. Nevertheless, in general static magnetic monopole solutions in varying-{alpha} theories depart from the classical 't Hooft-Polyakov solution with the electromagnetic energy concentrated inside the core seeding spatial variations of the fine-structure constant. We show that Equivalence Principle constraints impose tight limits on the allowed variations of {alpha} induced by magnetic monopoles which confirms the difficulty to generate significant spatial variation of the fine-structure constant found in previous works. This is true even in the most favorable case where magnetic monopoles are the source for these variations.

  11. Evolution of advertisement calls in African clawed frogs

    PubMed Central

    Tobias, Martha L.; Evans, Ben J.; Kelley, Darcy B.

    2014-01-01

    Summary For most frogs, advertisement calls are essential for reproductive success, conveying information on species identity, male quality, sexual state and location. While the evolutionary divergence of call characters has been examined in a number of species, the relative impacts of genetic drift or natural and sexual selection remain unclear. Insights into the evolutionary trajectory of vocal signals can be gained by examining how advertisement calls vary in a phylogenetic context. Evolution by genetic drift would be supported if more closely related species express more similar songs. Conversely, a poor correlation between evolutionary history and song expression would suggest evolution shaped by natural or sexual selection. Here, we measure seven song characters in 20 described and two undescribed species of African clawed frogs (genera Xenopus and Silurana) and four populations of X. laevis. We identify three call types — click, burst and trill — that can be distinguished by click number, call rate and intensity modulation. A fourth type is biphasic, consisting of two of the above. Call types vary in complexity from the simplest, a click, to the most complex, a biphasic call. Maximum parsimony analysis of variation in call type suggests that the ancestral type was of intermediate complexity. Each call type evolved independently more than once and call type is typically not shared by closely related species. These results indicate that call type is homoplasious and has low phylogenetic signal. We conclude that the evolution of call type is not due to genetic drift, but is under selective pressure. PMID:24723737

  12. AFRICACRYPT 2014 Call for Papers

    E-print Network

    Nitaj, Abderrahmane

    ENSIAS, Rabat Universit´e Mohamed V, Souissi Rabat, Morocco AFRICACRYPT 2014 Call for Papers #12 for Papers #12;Welcome to Morocco AFRICACRYPT 2014 Call for Papers #12;Welcome to Morocco AFRICACRYPT 2014 Call for Papers #12;Welcome to Morocco AFRICACRYPT 2014 Call for Papers #12;Welcome to Marrakech

  13. Call combinations in wild chimpanzees

    Microsoft Academic Search

    Catherine Crockford; Christophe Boesch

    2005-01-01

    Summary By combining different call types, such as barks with screams, individuals have the potential to vastly increase the range of information that can be decoded by listeners. Few animal studies, however, have examined the information content of call combinations compared with the information conveyed by each call singularly. We examined several aspects of call combinations in the repertoire of

  14. Decentralized power system stabilizer design using linear parameter varying approach

    Microsoft Academic Search

    Wenzheng Qiu; Vijay Vittal; Mustafa Khammash

    2004-01-01

    In this paper, the power system model is formulated as a finite dimensional linear system whose state-space entries depend continuously on a time varying parameter vector called the scheduling variables. This system is referred to as the linear parameter varying (LPV) system. Although the trajectory of the changing parameters such as load levels and tie line flows is not known

  15. Decentralized power system stabilizer design using linear parameter varying approach

    Microsoft Academic Search

    Wenzheng Qiu; V. Vittal; M. Khammash

    2005-01-01

    In this paper, the power system model is formulated as a finite dimensional linear system whose state-space entries depend continuously on a time varying parameter vector called the scheduling variables. This system is referred to as the linear parameter varying (LPV) system. Although the trajectory of the changing parameters such as load levels and tie line flows is not know

  16. Efficient Bayesian inference for stochastic time-varying copula models

    Microsoft Academic Search

    Carlos Almeida; Claudia Czado

    2012-01-01

    There is strong empirical evidence that dependence in multivariate financial time series varies over time. To model this effect, a time varying copula class is developed, which is called the stochastic copula autoregressive (SCAR) model. Dependence at time t is modeled by a real-valued latent variable, which corresponds to the Fisher Z transformation of Kendall’s ? for the chosen copula

  17. Call title: Call for INFLUENZA Call identifier: FP7-INFLUENZA-2010

    E-print Network

    Milano-Bicocca, Università

    1 Call title: Call for INFLUENZA Call identifier: FP7-INFLUENZA-2010 Date of publication: 30 July of this Call is to address research needs in human and animal influenza in view of the recent outbreak of a novel human influenza virus containing swine and avian gene sequences, and taking into account

  18. Energetic composites

    DOEpatents

    Danen, Wayne C. (Los Alamos, NM); Martin, Joe A. (Espanola, NM)

    1993-01-01

    A method for providing chemical energy and energetic compositions of matter consisting of thin layers of substances which will exothermically react with one another. The layers of reactive substances are separated by thin layers of a buffer material which prevents the reactions from taking place until the desired time. The reactions are triggered by an external agent, such as mechanical stress or an electric spark. The compositions are known as metastable interstitial composites (MICs). This class of compositions includes materials which have not previously been capable of use as energetic materials. The speed and products of the reactions can be varied to suit the application.

  19. Is alarm calling risky? Marmots avoid calling from risky places.

    PubMed

    Collier, Travis C; Blumstein, Daniel T; Girod, Lewis; Taylor, Charles E

    2010-12-01

    Alarm calling is common in many species. A prevalent assumption is that calling puts the vocalizing individual at increased risk of predation. If calling is indeed costly, we need special explanations for its evolution and maintenance. In some, but not all species, callers vocalize away from safety and thus may be exposed to an increased risk of predation. However, for species that emit bouts with one or a few calls, it is often difficult to identify the caller and find the precise location where a call was produced. We analyzed the spatial dynamics of yellow-bellied marmot (Marmota flaviventris) alarm calling using an acoustic localization system to determine the location from which calls were emitted. Marmots almost always called from positions close to the safety of their burrows, and, if they produced more than one alarm call, tended to end their calling bouts closer to safety than they started them. These results suggest that for this species, potential increased predation risk from alarm calling is greatly mitigated and indeed calling may have limited predation costs. PMID:21116460

  20. Is alarm calling risky? Marmots avoid calling from risky places

    PubMed Central

    Collier, Travis C.; Blumstein, Daniel T.; Girod, Lewis; Taylor, Charles E.

    2010-01-01

    Alarm calling is common in many species. A prevalent assumption is that calling puts the vocalizing individual at increased risk of predation. If calling is indeed costly, we need special explanations for its evolution and maintenance. In some, but not all species, callers vocalize away from safety and thus may be exposed to an increased risk of predation. However, for species that emit bouts with one or a few calls, it is often difficult to identify the caller and find the precise location where a call was produced. We analyzed the spatial dynamics of yellow-bellied marmot (Marmota flaviventris) alarm calling using an acoustic localization system to determine the location from which calls were emitted. Marmots almost always called from positions close to the safety of their burrows, and, if they produced more than one alarm call, tended to end their calling bouts closer to safety than they started them. These results suggest that for this species, potential increased predation risk from alarm calling is greatly mitigated and indeed calling may have limited predation costs. PMID:21116460

  1. Nearest Neighbour Algorithms for Forecasting Call Arrivals in Call Centers

    Microsoft Academic Search

    Sandjai Bhulai; Wing Hong Kan; Elena Marchiori

    In this paper we study a nearest neighbour algorithm for forecasting call arrivals to call centers. The algorithm does not require an underlying model for the arrival rates and it can be applied to historical data without pre-processing it. We show that this class of algorithms provides a more accurate forecast when compared to the conven- tional method that simply

  2. Preparation of Carbon Nanotube-Composite 

    E-print Network

    Sharma, Sundeep

    2011-08-08

    A composite is made up of two distinct materials and the resulted properties are different from the individual precursors. Composite combines a huge or bulkier element called matrix and reinforcement called filler or fiber. ...

  3. Call for Papers Game Technologies

    E-print Network

    Lau, W. H. Nynson

    Call for Papers Game Technologies Special Issue of The Journal of Visualization & Computer issue, we call for technical papers that describe novel game engine technologies. In particular, we are interested in papers that address technical issues of game engines that support multiplayer online games

  4. Acoustic adaptation in pygmy marmoset contact calls: Locational cues vary with distances between conspecifics

    Microsoft Academic Search

    Charles T. Snowdon; Alexandra Hodun

    1981-01-01

    1.The pygmy marmoset, Cebuella pygmaea, has four trill variants in its vocal repertoire. One of these trills has a different behavioral message from the other three. However, the remaining trills, which were physically different from each other, did not seem to differ in their behavioral messages.2.The three trills can be ordered according to their acoustic cues for sound localization. This

  5. Interpolating model identification for SISO linear parameter-varying systems

    Microsoft Academic Search

    Jan De Caigny; Juan F. Camino; Jan Swevers

    2009-01-01

    This paper presents a new method to estimate linear parameter-varying (LPV) state-space models for single-input single-output systems whose dynamics depend on one or more time-varying parameters, called scheduling parameters. The method is based on the interpolation of linear time-invariant models that are identified for fixed operating conditions of the system, that is, for constant values of the scheduling parameters. The

  6. House Calls in Private Practice.

    ERIC Educational Resources Information Center

    Whittington, Ronaele

    1985-01-01

    Relates the experiences of a social worker in private practice who offered house calls as an ongoing setting for counseling and psychotherapy to individuals and families. Describes advantages and disadvantages, liability, and target populations. (JAC)

  7. Back to school: the ultimate pediatric call.

    PubMed

    Marciano, Samuel D

    2004-07-01

    EMS agencies will continue to respond to calls that have varying levels of seriousness in the school setting. Although most calls will be routine, the potential for a large-scale incident is ever-present. School districts and EMS agencies have to be proactive in developing a plan for responding to these situations. This proactive attitude is essential in fostering cooperation and communication between the school and EMS. It enables us to achieve the goal of making our schools safer. The process in reaching this goal is ongoing and evolving. As an EMS provider, I am aware of the high anxiety that accompanies a call involving a seriously injured child. If the call involves five, 10 or more severely injured kids, the stress can be unbelievable. A plan of action that has been carefully developed, practiced and critiqued will lessen the anxiety and stress. As a teacher, I want my workplace and my students to be safe. If a situation arises, knowing that a planned response is in place, and knowing what I'm supposed to do, gives me the confidence to deal with the event so I can help my students. Finally, as a parent, it is important that my children are in a safe environment in which to learn. If an emergency response is needed, I want to know a good plan will go into effect. That would assure me that the people responsible for the health and safety of my children have done all they can to make school a safer place. PMID:15327179

  8. Social calls of flying big brown bats (Eptesicus fuscus)

    PubMed Central

    Wright, Genevieve S.; Chiu, Chen; Xian, Wei; Wilkinson, Gerald S.; Moss, Cynthia F.

    2013-01-01

    Vocalizations serving a variety of social functions have been reported in many bat species (Order Chiroptera). While echolocation by big brown bats (Eptesicus fuscus) has been the subject of extensive study, calls used by this species for communication have received comparatively little research attention. Here, we report on a rich repertoire of vocalizations produced by big brown bats in a large flight room equipped with synchronized high speed stereo video and audio recording equipment. Bats were studied individually and in pairs, while sex, age, and experience with a novel foraging task were varied. We used discriminant function analysis (DFA) to classify six different vocalizations that were recorded when two bats were present. Contingency table analyses revealed a higher prevalence of social calls when males were present, and some call types varied in frequency of emission based on trial type or bat age. Bats flew closer together around the time some social calls were emitted, indicating that communicative calls may be selectively produced when conspecifics fly near one another. These findings are the first reports of social calls from flying big brown bats and provide insight into the function of communicative vocalizations emitted by this species. PMID:23966949

  9. Social calls of flying big brown bats (Eptesicus fuscus).

    PubMed

    Wright, Genevieve S; Chiu, Chen; Xian, Wei; Wilkinson, Gerald S; Moss, Cynthia F

    2013-01-01

    Vocalizations serving a variety of social functions have been reported in many bat species (Order Chiroptera). While echolocation by big brown bats (Eptesicus fuscus) has been the subject of extensive study, calls used by this species for communication have received comparatively little research attention. Here, we report on a rich repertoire of vocalizations produced by big brown bats in a large flight room equipped with synchronized high speed stereo video and audio recording equipment. Bats were studied individually and in pairs, while sex, age, and experience with a novel foraging task were varied. We used discriminant function analysis (DFA) to classify six different vocalizations that were recorded when two bats were present. Contingency table analyses revealed a higher prevalence of social calls when males were present, and some call types varied in frequency of emission based on trial type or bat age. Bats flew closer together around the time some social calls were emitted, indicating that communicative calls may be selectively produced when conspecifics fly near one another. These findings are the first reports of social calls from flying big brown bats and provide insight into the function of communicative vocalizations emitted by this species. PMID:23966949

  10. Calling all..... First Time Freshmen

    E-print Network

    de Lijser, Peter

    Calling all..... First Time Freshmen Open House June 19th 5:00pm-6:30pm First time Freshmen and number of people attending We welcome all First Time Freshmen to come and explore what awaits you at CSUF Irvine Campus!! All Academic Advisement for First Time Freshmen is done at the Fullerton Campus through

  11. Call for Papers International Conference

    E-print Network

    Peters, Norbert

    produce biomass-based synthetic fuels. On the other hand, new combustion technologies are being developedCall for Papers 3rd International Conference of the Cluster of Excellence "Tailor-Made Fuels from of the 3rd International Conference of the Cluster of Excellence "Tailor-Made Fuels from Biomass

  12. Call for Papers Web Graphics

    E-print Network

    Lau, W. H. Nynson

    Call for Papers Web Graphics Special Issue of IEEE Computer Graphics & Applications Guest Editors a migration of traditional applications to run on the Web environment and a growing demand for more powerful web-based applications. Fused by the increasing availability and dramatic reduction in the cost of 3D

  13. CALL FOR PAPERS SAFECOMP2013

    E-print Network

    Ingrand, François

    CALL FOR PAPERS SAFECOMP2013 The 32nd International Conference on Computer Safety, Reliability but also electronics, com- munication devices and automotive. Conference venue, LAAS-CNRS Situated the conference secretariat. Paper submission details The tradition of SAFECOMP is to act as a platform

  14. CALL FOR PAPERS Information Sciences

    E-print Network

    Chen, Min

    CALL FOR PAPERS Information Sciences Special Issue on "Mobile and Internet Services in Ubiquitous and electronic devices, there has been a considerable interest in Ubiquitous and Pervasive Computing (UPC). UPC environments with focus on mobile and internet services. Paper submissions on practical and theoretical topics

  15. CALL FOR ARTISTS Alumni Exhibition

    E-print Network

    Berdichevsky, Victor

    CALL FOR ARTISTS Alumni Exhibition: WSU Art Education & Art Therapy The WSU Art Education and Art Therapy wing of the Community Arts Building on Wayne State's campus. We hope to display one Alumnus. Submissions from all Art Education/Art Therapy Alumni will be considered and Alumni are encouraged to submit

  16. The Tasks of Teaching Classes of Varied Group Composition.

    ERIC Educational Resources Information Center

    Evertson, Carolyn M.; Hickman, Randall C.

    Research in classrooms must be sensitive to new dimensions of teaching tasks that emerge at the group level. There are at least two tasks that can be identified as being affected by changes in group characteristics. The first task is to set the stage--the teacher must establish the proper context or setting to support academic activities. The…

  17. Call title: ERA-NET Call 2010 Call identifier: FP7-ERANET-2010-RTD

    E-print Network

    Milano-Bicocca, Università

    of Molecular Plant Sciences - ERA-NET 1.0 1 The Director-General responsible for the call may delay resources KBBE.2010.1.2-6 Deepened and enlarged cooperation between phytosanitary (statutory plant health.2010.4.0-7 ERA-NET on Nano- technologies, including Nano-toxicology 1.5 4.4 Integration of technologies

  18. Hydride compositions

    DOEpatents

    Lee, Myung, W.

    1994-01-01

    Disclosed are a composition for use in storing hydrogen and a method for making the composition. The composition comprises a mixture of two or more hydrides, each hydride having a different series of hydrogen sorption isotherms that contribute to the overall isotherms of the mixture. The hydrides are chosen so that the isotherms of the mixture have regions wherein the H equilibrium pressure increases with increasing hydrogen, preferably linearly. The isotherms of the mixture can be adjusted by selecting hydrides with different isotherms and by varying the amounts of the individual hydrides, or both. Preferably, the mixture is made up of hydrides that have isotherms with substantially flat plateaus and in nearly equimolar amounts. The composition is activated by degassing, exposing to H, and then heating below the softening temperature of any of the constituents. When the composition is used to store hydrogen, its hydrogen content can be found simply by measuring P{sub H}{sub 2} and determining H/M from the isothermic function of the composition.

  19. A call for budget reform

    Microsoft Academic Search

    Bernard T. Pitsvada

    1996-01-01

    This article calls for reform of the U.S. Federal budget from two perspectives, preparation and content. The first aspect of reform proposes to amend the Budget and Accounting Act of 1921 by eliminating the requirement for an executive budget. It proposes replacing the executive budget submission with a budget prepared by a joint executive-legislative council. While the decision-making process for

  20. Vector-based Natural Language Call Routing

    Microsoft Academic Search

    Jennifer Chu-Carroll; Bob Carpenter

    1999-01-01

    This paper describes a domain-independent, automatically trained natural language call router for directing incoming calls in a call center. Our call router directs customer calls based on their response to an open-ended -gram terms extracted from the caller's request, the caller is 1) routed to the appropriate destination, 2) transferred to a human operator, or 3) asked a disambiguation question.

  1. Look who is calling: a comparison of genotype calling algorithms.

    PubMed

    Vens, Maren; Schillert, Arne; König, Inke R; Ziegler, Andreas

    2009-01-01

    In genome-wide association studies, high-level statistical analyses rely on the validity of the called genotypes, and different genotype calling algorithms (GCAs) have been proposed. We compared the GCAs Bayesian robust linear modeling using Mahalanobis distance (BRLMM), Chiamo++, and JAPL using the autosomal single-nucleotide polymorphisms (SNPs) from the 500 k Affymetrix Array Set data of the Framingham Heart Study as provided for the Genetic Analysis Workshop 16, Problem 2, and prepared standard quality control (sQC) for each algorithm. Using JAPL, most individuals were retained for the analysis. The lowest number of SNPs that successfully passed sQC was observed for BRLMM and the highest for Chiamo++. All three GCAs fulfilled all sQC criteria for 79% of the SNPs but at least one GCA failed for 18% of the SNPs. Previously undetected errors in strand coding were identified by comparing genotype concordances between GCAs. Concordance dropped with the number of GCAs failing sQC. We conclude that JAPL and Chiamo++ are the GCAs of choice if the aim is to keep as many subjects and SNPs as possible, respectively. PMID:20018052

  2. Look who is calling: a comparison of genotype calling algorithms

    PubMed Central

    2009-01-01

    In genome-wide association studies, high-level statistical analyses rely on the validity of the called genotypes, and different genotype calling algorithms (GCAs) have been proposed. We compared the GCAs Bayesian robust linear modeling using Mahalanobis distance (BRLMM), Chiamo++, and JAPL using the autosomal single-nucleotide polymorphisms (SNPs) from the 500 k Affymetrix Array Set data of the Framingham Heart Study as provided for the Genetic Analysis Workshop 16, Problem 2, and prepared standard quality control (sQC) for each algorithm. Using JAPL, most individuals were retained for the analysis. The lowest number of SNPs that successfully passed sQC was observed for BRLMM and the highest for Chiamo++. All three GCAs fulfilled all sQC criteria for 79% of the SNPs but at least one GCA failed for 18% of the SNPs. Previously undetected errors in strand coding were identified by comparing genotype concordances between GCAs. Concordance dropped with the number of GCAs failing sQC. We conclude that JAPL and Chiamo++ are the GCAs of choice if the aim is to keep as many subjects and SNPs as possible, respectively. PMID:20018052

  3. 78 FR 76257 - Rural Call Completion

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-12-17

    ...level of service for completing long-distance calls to rural areas. This document...concerns about completion of long-distance calls to rural areas. Doing so will help ensure that long-distance calls to all Americans,...

  4. Call for Proposals Critical Research Equipment Funds

    E-print Network

    Napier, Terrence

    Call for Proposals Critical Research Equipment Funds Purpose The purpose of this Call for Proposals is to identify, and enable acquisition of, equipment in areas that are dependent upon such equipment. In response to this call

  5. Report calls for riparian protection

    NASA Astrophysics Data System (ADS)

    Showstack, Randy

    A 22 March report by The (U.S.) National Academies calls for the protection and restoration of riparian areas in the United States. However, it concedes that key difficulties in this endeavor include the lack of basic information about the extent and ecological health of these areas, and even a precise ecological definition of what a riparian area is.The report, “Riparian Areas: Functions and Strategies for Management” prepared by the Water Science and Technology Board of the National Research Council, states that “restoration of riparian functions along America's water bodies should be a national goal.”

  6. Individual, Contextual, and Age-Related Acoustic Variation in Simakobu (Simias concolor) Loud Calls

    PubMed Central

    Erb, Wendy M.; Hodges, J. Keith; Hammerschmidt, Kurt

    2013-01-01

    Primate loud calls have the potential to encode information about the identity, arousal, age, or physical condition of the caller, even at long distances. In this study, we conducted an analysis of the acoustic features of the loud calls produced by a species of Asian colobine monkey (simakobu, Simias concolor). Adult male simakobu produce loud calls spontaneously and in response to loud sounds and other loud calls, which are audible more than 500 m. Individual differences in calling rates and durations exist, but it is unknown what these differences signal and which other acoustic features vary among individuals. We aimed to describe the structure and usage of calls and to examine acoustic features that vary within and among individuals. We determined the context of 318 loud calls and analyzed 170 loud calls recorded from 10 adult males at an undisturbed site, Pungut, Siberut Island, Indonesia. Most calls (53%) followed the loud call of another male, 31% were spontaneous, and the remaining 16% followed a loud environmental disturbance. The fundamental frequency (F0) decreased while inter-unit intervals (IUI) increased over the course of loud call bouts, possibly indicating caller fatigue. Discriminant function analysis indicated that calls were not well discriminated by context, but spontaneous calls had higher peak frequencies, suggesting a higher level of arousal. Individual calls were distinct and individuals were mainly discriminated by IUI, call duration, and F0. Loud calls of older males had shorter IUI and lower F0, while middle-aged males had the highest peak frequencies. Overall, we found that calls were individually distinct and may provide information about the age, stamina, and arousal of the calling male, and could thus be a way for males and females to assess competitors and mates from long distances. PMID:24376651

  7. Incremental closed-loop identification of linear parameter varying systems

    Microsoft Academic Search

    Jan Bendtsen; Klaus Trangbaek

    2011-01-01

    This paper deals with system identification for control of linear parameter varying systems. In practical applications, it is often important to be able to identify small plant changes in an incremental manner without shutting down the system and\\/or disconnecting the controller; unfortunately, closed-loop system identification is more difficult than open- loop identification. In this paper we prove that the so-called

  8. Calling behavior of blue and fin whales off California

    NASA Astrophysics Data System (ADS)

    Oleson, Erin Marie

    Passive acoustic monitoring is an effective means for evaluating cetacean presence in remote regions and over long time periods, and may become an important component of cetacean abundance surveys. To use passive acoustic recordings for abundance estimation, an understanding of the behavioral ecology of cetacean calling is crucial. In this dissertation, I develop a better understanding of how blue (Balaenoptera musculus) and fin (B. physalus ) whales use sound with the goal of evaluating passive acoustic techniques for studying their populations. Both blue and fin whales produce several different call types, though the behavioral and environmental context of these calls have not been widely investigated. To better understand how calling is used by these whales off California I have employed both new technologies and traditional techniques, including acoustic recording tags, continuous long-term autonomous acoustic recordings, and simultaneous shipboard acoustic and visual surveys. The outcome of these investigations has led to several conclusions. The production of blue whale calls varies with sex, behavior, season, location, and time of day. Each blue whale call type has a distinct behavioral context, including a male-only bias in the production of song, a call type thought to function in reproduction, and the production of some calls by both sexes. Long-term acoustic records, when interpreted using all call types, provide a more accurate measure of the local seasonal presence of whales, and how they use the region annually, seasonally and daily. The relative occurrence of different call types may indicate prime foraging habitat and the presence of different segments of the population. The proportion of animals heard calling changes seasonally and geographically relative to the number seen, indicating the calibration of acoustic and visual surveys is complex and requires further study on the motivations behind call production and the behavior of calling whales. These findings will play a role in the future development of acoustic census methods and habitat studies for these species, and will provide baseline information for the determination of anthropogenic impacts on these populations.

  9. DISCRETE VARIANTS OF EVENING GROSBEAK FLIGHT CALLS

    Microsoft Academic Search

    Kendra Sewall; Rodd Kelsey; Thomas P. Hahn

    2004-01-01

    We describe four discrete variants of the frequency-modulated flight calls of Evening Grosbeaks (Coccothraustes vespertinus) in the United States and southwestern Canada. Each call type is aurally and spectrographically distinct, and individual birds appear to produce only one call type. The observed geograph- ic distributions of these call types are roughly concor- dant with described subspecies ranges. The long-term geographic

  10. Adjusting Permittivity by Blending Varying Ratios of SWNTs

    NASA Technical Reports Server (NTRS)

    Tour, James M.; Stephenson, Jason J.; Higginbotham, Amanda

    2012-01-01

    A new composite material of singlewalled carbon nanotubes (SWNTs) displays radio frequency (0 to 1 GHz) permittivity properties that can be adjusted based upon the nanotube composition. When varying ratios of raw to functionalized SWNTs are blended into the silicone elastomer matrix at a total loading of 0.5 percent by weight, a target real permittivity value can be obtained between 70 and 3. This has particular use for designing materials for microwave lenses, microstrips, filters, resonators, high-strength/low-weight electromagnetic interference (EMI) shielding, antennas, waveguides, and low-loss magneto-dielectric products for applications like radome construction.

  11. Female preferences for socially variable call characters in the cricket frog, Acris crepitans

    E-print Network

    Ryan, Michael J.

    competition varies with the number and density of males in an area. Accordingly, males often escalate-function signals, escalation may increase a male's dominance status in direct male­ male competition, increase his. number: A9594) Male cricket frogs produce only one type of call, the advertisement call, which both

  12. Behavioral context of call production by eastern North Pacific blue whales

    E-print Network

    Oleson, Erin M; Calambokidis, J; Burgess, W C; McDonald, M A; LeDuc, C A; Hildebrand, J A

    2007-01-01

    within 30 min of tag attachment. Skin samples were obtainedThe tag was held on the whale with suction cups. Skin wasskin sampling, diving and iors associated with calling vary by call type, indicating acoustic behavior recorded on the tag

  13. Time varying networks and the weakness of strong ties

    PubMed Central

    Karsai, Márton; Perra, Nicola; Vespignani, Alessandro

    2014-01-01

    In most social and information systems the activity of agents generates rapidly evolving time-varying networks. The temporal variation in networks' connectivity patterns and the ongoing dynamic processes are usually coupled in ways that still challenge our mathematical or computational modelling. Here we analyse a mobile call dataset and find a simple statistical law that characterize the temporal evolution of users' egocentric networks. We encode this observation in a reinforcement process defining a time-varying network model that exhibits the emergence of strong and weak ties. We study the effect of time-varying and heterogeneous interactions on the classic rumour spreading model in both synthetic, and real-world networks. We observe that strong ties severely inhibit information diffusion by confining the spreading process among agents with recurrent communication patterns. This provides the counterintuitive evidence that strong ties may have a negative role in the spreading of information across networks. PMID:24510159

  14. Function of loud calls in wild bonobos.

    PubMed

    White, Frances; Waller, Michel; Boose, Klaree; Merrill, Michelle; Wood, Kimberley

    2015-07-20

    Under the social origins hypothesis, human language is thought to have evolved within the framework of non-human primate social contexts and relationships. Our two closest relatives, chimpanzees and bonobos, however, have very different social relationships and this may be reflected in their use of loud calls. Much of loud calling in the male-bonded and aggressive chimpanzee functions for male alliance formation and intercommunity aggression. Bonobos, however, are female bonded and less aggressive and little is known on the use and function of their loud calls. Data on frequencies, context, and locations of vocalizations were collected for wild bonobos, Pan paniscus, at the Lomako Forest study site in the Democratic Republic of the Congo from 1983 to 2009. Both males and females participated in loud calls used for inter-party communication. Calling and response rates by both males and females were higher during party fusion than party fission and were common at evening nesting. The distribution of loud calls within the community range of loud calls was not random with males calling significantly more towards the periphery of the range and females calling significantly more in central areas. Calling and party fission were common at food patches. Responses were more frequent for female calls than for male calls. Calling, followed by fusion, was more frequent when a small party called from a large patch. We conclude that bonobo females and males loud calls can function in inter-party communication to call others to large food patches. Females call to attract potential allies and males call to attract potential mates. Our results support the social hypothesis of the origin of language because differences in the function and use of loud calls reflect the differing social systems of chimpanzees and bonobos. Bonobo loud calls are important for female communication and function in party coordination and, unlike chimpanzees, are less important in male cooperative aggression. PMID:25324464

  15. Scaled Composites

    NSDL National Science Digital Library

    On April 18, 2003, an historic event in space travel was marked by the unveiling of the first private manned spacecraft and launch platform (called SpaceShipOne and White Knight, respectively). Already constructed and in the test flight stage of its development, the project was hidden from the public in order to reveal a finished product rather than just schematics. Scaled Composites, the private company that developed the spacecraft, gives data sheets and photos on its homepage. A detailed list of frequently asked questions addresses many issues regarding the project and its implications.

  16. An empirical analysis of the corporate call decision

    NASA Astrophysics Data System (ADS)

    Carlson, Murray Dean

    1998-12-01

    In this thesis we provide insights into the behavior of financial managers of utility companies by studying their decisions to redeem callable preferred shares. In particular, we investigate whether or not an option pricing based model of the call decision, with managers who maximize shareholder value, does a better job of explaining callable preferred share prices and call decisions than do other models of the decision. In order to perform these tests, we extend an empirical technique introduced by Rust (1987) to include the use of information from preferred share prices in addition to the call decisions. The model we develop to value the option embedded in a callable preferred share differs from standard models in two ways. First, as suggested in Kraus (1983), we explicitly account for transaction costs associated with a redemption. Second, we account for state variables that are observed by the decision makers but not by the preferred shareholders. We interpret these unobservable state variables as the benefits and costs associated with a change in capital structure that can accompany a call decision. When we add this variable, our empirical model changes from one which predicts exactly when a share should be called to one which predicts the probability of a call as the function of the observable state. These two modifications of the standard model result in predictions of calls, and therefore of callable preferred share prices, that are consistent with several previously unexplained features of the data; we show that the predictive power of the model is improved in a statistical sense by adding these features to the model. The pricing and call probability functions from our model do a good job of describing call decisions and preferred share prices for several utilities. Using data from shares of the Pacific Gas and Electric Co. (PGE) we obtain reasonable estimates for the transaction costs associated with a call. Using a formal empirical test, we are able to conclude that the managers of the Pacific Gas and Electric Company clearly take into account the value of the option to delay the call when making their call decisions. Overall, the model seems to be robust to tests of its specification and does a better job of describing the data than do simpler models of the decision making process. Limitations in the data do not allow us to perform the same tests in a larger cross-section of utility companies. However, we are able to estimate transaction cost parameters for many firms and these do not seem to vary significantly from those of PGE. This evidence does not cause us to reject our hypothesis that managerial behavior is consistent with a model in which managers maximize shareholder value.

  17. Time varying velocity of light

    E-print Network

    Tiwari, S C

    2002-01-01

    Recently there has been a lot of intersest in the superluminal phenomena, and time varying velocity of light cosmological models. More than two decades ago at Einstein centenary symposium, Nagpur I had put forward space-time interaction hypothesis. One of its predictions was that velocity of light decreased with the age of Universe. In view of the profoundness of the hypothesis the original paper is reproduced here. We also mention that in a paper "Quasars, Tachyons and the early universe" proc. Einstein found. Intnl. 2(3), 1985 pp 69-75, it was suggested that, "The boundary region of the universe being the source of radiation, the slowing down of the speed of radiation from $4.4 \\times 10^{10}$ cm/sec at $t_A = 10^{10}$ yrs. to the present value of $3 \\times 10^{10}$ cm/sec should show up as a large red shifts. The successive boundary region radiations at various epoch will give rise to a wide range of red shifts. Therefore, defining quasars as the objects having two properties: large red shifts and powerful...

  18. Local varying-alpha theories

    NASA Astrophysics Data System (ADS)

    2015-06-01

    In a recent paper, we demonstrated how the simplest model for varying-alpha may be interpreted as the effect of a dielectric material, generalized to be consistent with Lorentz invariance. Unlike normal dielectrics, such a medium cannot change the speed of light, and its dynamics obey a Klein-Gordon equation. This work immediately suggests an extension of the standard theory, even if we require compliance with Lorentz invariance. Instead of a wave equation, the dynamics may satisfy a local algebraic relation involving the permittivity and the properties of the electromagnetic (EM) field, in analogy with more conventional dielectric (but still preserving Lorentz invariance). We develop the formalism for such theories and investigate some phenomenological implications. The problem of the divergence of the classical self-energy can be solved, or at least softened, in this framework. Some interesting new cosmological solutions for the very early universe are found, including the possibility of a bounce, inflation and expansion with a loitering phase, all of which are induced by early variations in alpha.

  19. Qualitative Strategy for Inbound Call Center Outsourcing

    E-print Network

    Sankaranaraynan, Meenakshi

    2010-05-14

    An analysis of the various challenges of the call center industry, together with the challenges of outsourcing, revealed a need for developing a strategy that acts as a guide for organizations that are willing to outsource their call center...

  20. NOCTURNAL FLIGHT CALL OF BICKNELL'S THRUSH

    Microsoft Academic Search

    WILLIAM R. EVANS

    AnsraAcr. -Audio recordings of nocturnal flight calls of migrating birds along the east- central Florida coast in May have documented calls that sound similar to those from Gray- cheeked Thrushes (Cutharus minimus). Spectrographic comparison of these \\

  1. Hornbills can distinguish between primate alarm calls.

    PubMed Central

    Rainey, Hugo J.; Zuberbühler, Klaus; Slater, Peter J. B.

    2004-01-01

    Some mammals distinguish between and respond appropriately to the alarm calls of other mammal and bird species. However, the ability of birds to distinguish between mammal alarm calls has not been investigated. Diana monkeys (Cercopithecus diana) produce different alarm calls to two predators: crowned eagles (Stephanoaetus coronatus) and leopards (Panthera pardus). Yellow-casqued hornbills (Ceratogymna elata) are vulnerable to predation by crowned eagles but are not preyed on by leopards and might therefore be expected to respond to the Diana monkey eagle alarm call but not to the leopard alarm call. We compared responses of hornbills to playback of eagle shrieks, leopard growls, Diana monkey eagle alarm calls and Diana monkey leopard alarm calls and found that they distinguished appropriately between the two predator vocalizations as well as between the two Diana monkey alarm calls. We discuss possible mechanisms leading to these responses. PMID:15209110

  2. Perceiving a Calling, Living a Calling, and Job Satisfaction: Testing a Moderated, Multiple Mediator Model

    ERIC Educational Resources Information Center

    Duffy, Ryan D.; Bott, Elizabeth M.; Allan, Blake A.; Torrey, Carrie L.; Dik, Bryan J.

    2012-01-01

    The current study examined the relation between perceiving a calling, living a calling, and job satisfaction among a diverse group of employed adults who completed an online survey (N = 201). Perceiving a calling and living a calling were positively correlated with career commitment, work meaning, and job satisfaction. Living a calling moderated…

  3. Probabilistic priority assessment of nurse calls.

    PubMed

    Ongenae, Femke; Myny, Dries; Dhaene, Tom; Defloor, Tom; Van Goubergen, Dirk; Verhoeve, Piet; Decruyenaere, Johan; De Turck, Filip

    2014-05-01

    Current nurse call systems are very static. Call buttons are fixed to the wall, and systems do not account for various factors specific to a situation. We have developed a software platform, the ontology-based Nurse Call System (oNCS), which supports the transition to mobile and wireless nurse call buttons and uses an intelligent algorithm to address nurse calls. This algorithm dynamically adapts to the situation at hand by taking the profile information of staff and patients into account by using an ontology. This article describes a probabilistic extension of the oNCS that supports a more sophisticated nurse call algorithm by dynamically assigning priorities to calls based on the risk factors of the patient and the kind of call. The probabilistic oNCS is evaluated through implementation of a prototype and simulations, based on a detailed dataset obtained from 3 nursing departments of Ghent University Hospital. The arrival times of nurses at the location of a call, the workload distribution of calls among nurses, and the assignment of priorities to calls are compared for the oNCS and the current nurse call system. Additionally, the performance of the system and the parameters of the priority assignment algorithm are explored. The execution time of the nurse call algorithm is on average 50.333 ms. Moreover, the probabilistic oNCS significantly improves the assignment of nurses to calls. Calls generally result in a nurse being present more quickly, the workload distribution among the nurses improves, and the priorities and kinds of calls are taken into account. PMID:24399820

  4. Calling in Work: Secular or Sacred?

    ERIC Educational Resources Information Center

    Steger, Michael F.; Pickering, N. K.; Shin, J. Y.; Dik, B. J.

    2010-01-01

    Recent scholarship indicates that people who view their work as a calling are more satisfied with their work and their lives. Historically, calling has been regarded as a religious experience, although modern researchers frequently have adopted a more expansive and secular conceptualization of calling, emphasizing meaning and personal fulfillment…

  5. INTRODUCTION Echolocation call structure can be ex-

    E-print Network

    Gannon, Michael R.

    INTRODUCTION Echolocation call structure can be ex- pressed in terms of frequency and temporal of Zoology PAS Echolocation calls and wing morphology of bats from the West Indies NANCY VAUGHAN JENNINGS1 Echolocation calls of 119 bats belonging to 12 species in three families from Antillean islands of Puerto Rico

  6. Selective Tail Call Elimination Yasuhiko Minamide

    E-print Network

    Minamide, Yasuhiko

    a trampoline. To reduce the overhead of trampolining while preserving stack space asymptotically we propose of successive tail calls generated by the execution of an expression, and trampolines are introduced only when, proper tail calls can be implemented with a technique called a trampoline. However, the trampoline

  7. k-Calling Context Profiling Giorgio Ausiello

    E-print Network

    Finocchi, Irene

    useful clues to the hot spots of a program that may be hidden in a calling context tree and using lessk-Calling Context Profiling Giorgio Ausiello Dept. of Computer and System Sciences Sapienza University of Rome firmani@dis.uniroma1.it Abstract Calling context trees are one of the most fundamental

  8. Color Constancy for Scenes with Varying Illumination (Color Constancy with Varying Illumination)

    E-print Network

    Barnard, Kobus

    Color Constancy for Scenes with Varying Illumination (Color Constancy with Varying Illumination, Graham Finlayson, and Brian Funt, ``Colour constancy for scenes with varying illumination,'' Computer Abstract We present an algorithm which uses information from both surface reflectance and illumination

  9. Color Constancy for Scenes with Varying Illumination (Color Constancy with Varying Illumination)

    E-print Network

    Barnard, Kobus

    Color Constancy for Scenes with Varying Illumination (Color Constancy with Varying Illumination, Graham Finlayson, and Brian Funt, "Colour constancy for scenes with varying illumination," Computer;2 Abstract We present an algorithm which uses information from both surface reflectance and illumination

  10. Time-varying Reeb Graphs: A Topological Framework Supporting the Analysis of Continuous Time-varying Data

    SciTech Connect

    Mascarenhas, A

    2006-11-28

    I present time-varying Reeb graphs as a topological framework to support the analysis of continuous time-varying data. Such data is captured in many studies, including computational fluid dynamics, oceanography, medical imaging, and climate modeling, by measuring physical processes over time, or by modeling and simulating them on a computer. Analysis tools are applied to these data sets by scientists and engineers who seek to understand the underlying physical processes. A popular tool for analyzing scientific datasets is level sets, which are the points in space with a fixed data value s. Displaying level sets allows the user to study their geometry, their topological features such as connected components, handles, and voids, and to study the evolution of these features for varying s. For static data, the Reeb graph encodes the evolution of topological features and compactly represents topological information of all level sets. The Reeb graph essentially contracts each level set component to a point. It can be computed efficiently, and it has several uses: as a succinct summary of the data, as an interface to select meaningful level sets, as a data structure to accelerate level set extraction, and as a guide to remove noise. I extend these uses of Reeb graphs to time-varying data. I characterize the changes to Reeb graphs over time, and develop an algorithm that can maintain a Reeb graph data structure by tracking these changes over time. I store this sequence of Reeb graphs compactly, and call it a time-varying Reeb graph. I augment the time-varying Reeb graph with information that records the topology of level sets of all level values at all times, that maintains the correspondence of level set components over time, and that accelerates the extraction of level sets for a chosen level value and time. Scientific data sampled in space-time must be extended everywhere in this domain using an interpolant. A poor choice of interpolant can create degeneracies that are difficult to resolve, making construction of time-varying Reeb graphs impractical. I investigate piecewise-linear, piecewise-trilinear, and piecewise-prismatic interpolants, and conclude that piecewise-prismatic is the best choice for computing time-varying Reeb graphs. Large Reeb graphs must be simplified for an effective presentation in a visualization system. I extend an algorithm for simplifying static Reeb graphs to compute simplifications of time-varying Reeb graphs as a first step towards building a visualization system to support the analysis of time-varying data.

  11. Application of beyond $?N$ formalism -- Varying sound speed

    E-print Network

    Yu-ichi Takamizu

    2014-01-21

    We focus on the evolution of curvature perturbation on superhorizon scales by adopting the spatial gradient expansion and show that the nonlinear theory, called the beyond $\\delta N$-formalism as the next-leading order in the expansion. As one application of our formalism for a single scalar field, we investigate the case of varying sound speed. In our formalism, we can deal with the time evolution in contrast to $\\delta N$-formalism, where curvature perturbations remain just constant, and nonlinear curvature perturbation follows the simple master equation whose form is similar as one in linear theory. So the calculation of bispectrum can be done in the next-leading order in the expansion as similar as the case of deriving the power spectrum. We discuss localized features of both primordial power and bispectrum generated by the effect of varying sound speed with a finite duration time. We can see a local feature like a bump in the equilateral bispectrum.

  12. The tiling phenomenon of ?? modulators with time-varying inputs

    NASA Astrophysics Data System (ADS)

    Thao, Nguyen T.

    2007-09-01

    Currently, the most efficient technique to coarsely quantize the coefficients of redundant shift invariant signal expansions is a recursive method called ?? modulation. However, the error of approximation resulting from this type of quantization is difficult to analyze rigorously. This is because a ?? modulator is basically a nonlinear feedback system. With constant inputs, it was previously shown that the state vectors of ?? modulators of a certain class appear to remain in a tile. In this paper, we show experimentally that this property remains valid with a class of time-varying inputs. We explain the importance of the tiling property for the error analysis of ?? modulation.

  13. A Priority Based Call Admission Control Protocol with Call Degradation for Cellular Networks

    E-print Network

    Aboelaze, Mokhtar

    important role in the performance of wireless networks. In this paper, we present a call admission controlA Priority Based Call Admission Control Protocol with Call Degradation for Cellular Networks are contradictory (network utilization, revenue, QoS, fairness, ... ). The call admission control works in real

  14. Disentangling the Link between Perceiving a Calling and Living a Calling

    ERIC Educational Resources Information Center

    Duffy, Ryan D.; Autin, Kelsey L.

    2013-01-01

    Research has suggested there is an important distinction between perceiving a calling and living a calling. With a sample of 542 working adults, the current study examined (a) the degree to which perceiving a calling and living a calling differed according to yearly income and level of educational attainment and (b) potential mediators that may…

  15. Composite Nonwovens

    Microsoft Academic Search

    Dipayan Das; Arun Kumar Pradhan; R. Chattopadhyay; S. N. Singh

    2012-01-01

    The term ‘composite nonwovens’ refers to a category of materials different from ‘nonwoven composites’, which consist of a resinous matrix reinforced by an embedded nonwoven fabric. Many scientists would like to rename ‘composite nonwovens’ as ‘soft nonwoven composites’ and ‘nonwoven composites’ as ‘hard nonwoven composites’. Composite nonwovens are created by a modern and innovative industry employing nonwoven technologies to bring

  16. A micro-geography of fear: learning to eavesdrop on alarm calls of neighbouring heterospecifics

    PubMed Central

    Magrath, Robert D.; Bennett, Thomas H.

    2012-01-01

    Many vertebrates eavesdrop on alarm calls of other species, which is a remarkable ability, given geographical variation in community composition and call diversity within and among species. We used micro-geographical variation in community composition to test whether individuals recognize heterospecific alarm calls by: (i) responding to acoustic features shared among alarm calls; (ii) having innate responses to particular heterospecific calls; or (iii) learning specific alarm calls. We found that superb fairy-wrens (Malurus cyaneus) fled to cover to playback of noisy miner (Manorina melanocephala) aerial predator alarm calls only in locations where miners were present, suggesting that learning rather than acoustic structure determines response. Sites with and without miners were well within the dispersal distance of fairy-wrens, and philopatric males and dispersing females showed the same pattern, so that local genetic adaptation is extremely unlikely. Furthermore, where miners were present, fairy-wrens responded appropriately to different miner calls, implying eavesdropping on their signalling system rather than fleeing from miners themselves. Learned eavesdropping on alarm calls enables individuals to harvest ecologically relevant information from heterospecifics on an astonishingly fine spatial scale. Such phenotypic plasticity is valuable in a changing world, where individuals can be exposed to new species. PMID:21849313

  17. Variations in nanostructure and composition for controlling the interfacial properties of metal matrix composites and ceramic matrix composites

    Microsoft Academic Search

    J. T. McGinn; B. Singh; T. Mukherji

    1995-01-01

    Interface properties are critical to the strength and toughness of metal matrix composites and ceramic matrix composites. These interfaces provide both diffusion barriers and load transfer functions. The nanostructure across the interface was varied to fulfill conflicting diffusion and load transfer demands. The deposition conditions developed allow nanostructure control of TiN fiber coatings. The TiN coating varied from a dense,

  18. CALL in Lebanese elementary ESL writing classrooms

    Microsoft Academic Search

    Diana Fidaoui; Rima Bahous; Nahla N. Bacha

    2010-01-01

    This article discusses the effectiveness of using computer assisted language learning (CALL) in motivating fourth-grade English as a second language (ESL) students to develop better writing skills. It also seeks to explore the perceptions of ESL teachers and students regarding the use of CALL in the ESL classroom. The study involved 48 fourth graders and their four teachers. Data were

  19. Help Options in CALL: A Systematic Review

    ERIC Educational Resources Information Center

    Cardenas-Claros, Monica S.; Gruba, Paul A.

    2009-01-01

    This paper is a systematic review of research investigating help options in the different language skills in computer-assisted language learning (CALL). In this review, emerging themes along with is-sues affecting help option research are identified and discussed. We argue that help options in CALL are application resources that do not only seem…

  20. CALL FOR POSTERS 1. International Conference

    E-print Network

    Peters, Norbert

    CALL FOR POSTERS 1. International Conference and 6. TMFB International Workshop of the Cluster;Call for Posters During the 1. International Conference of the Cluster of Excellence "Tailor-Made Fuels from Biomass", a poster session will allow scientists to present their work and latest results face

  1. A CALL for Improved School Leadership

    ERIC Educational Resources Information Center

    Halverson, Richard; Kelley, Carolyn; Shaw, James

    2014-01-01

    The Comprehensive Assessment of Leadership for Learning (CALL) is a formative assessment that provides feedback to schools on the research-based leadership practices necessary to improve teaching and learning. Instead of focusing on an individual leader, CALL measures leadership practices in tasks carried out by actors across the school and…

  2. Call admission control in DCA wireless network

    Microsoft Academic Search

    Wong Yiu Ming; J. Misic; S. T. Chanson

    1998-01-01

    A novel call admission control (CAC) scheme based on dynamic channel allocation (DCA) is proposed for cellular networks. The scheme combines the advantage of high channel availability of DCA with quality of service guarantees of CAC. Our scheme uses statistical bandwidth reservation for handoff events. A new call is rejected if the probability of the required bandwidth exceeds the available

  3. CALL in Lebanese Elementary ESL Writing Classrooms

    ERIC Educational Resources Information Center

    Fidaoui, Diana; Bahous, Rima; Bacha, Nahla N.

    2010-01-01

    This article discusses the effectiveness of using computer assisted language learning (CALL) in motivating fourth-grade English as a second language (ESL) students to develop better writing skills. It also seeks to explore the perceptions of ESL teachers and students regarding the use of CALL in the ESL classroom. The study involved 48 fourth…

  4. Identification of linear parameter varying models

    Microsoft Academic Search

    B. Bamieh; L. Giarre

    1999-01-01

    We consider the problem of identifying discrete-time linear parameter varying models of nonlinear or time-varying systems. We assume that inputs, outputs and the scheduling parameters are measured, and a form of the functional dependence of the coefficients on the parameters. We show how the identification problem can be reduced to a linear regression, and we give conditions on persistency of

  5. Robust identification of linear parameter varying systems

    Microsoft Academic Search

    Maria Cecilia Mazzaro; E. A. Movsichoff; R. S. S. Pena

    1999-01-01

    We study the robust identification problem for a special class of linear parameter varying systems, when it is assumed that there is only one varying parameter and all the states of the system under identification can be measured. We consider a worst-case approach, i.e., we look for a set of models in a class of systems defined a priori, which

  6. Fractal analysis of time varying data

    DOEpatents

    Vo-Dinh, Tuan (Knoxville, TN); Sadana, Ajit (Oxford, MS)

    2002-01-01

    Characteristics of time varying data, such as an electrical signal, are analyzed by converting the data from a temporal domain into a spatial domain pattern. Fractal analysis is performed on the spatial domain pattern, thereby producing a fractal dimension D.sub.F. The fractal dimension indicates the regularity of the time varying data.

  7. A Varying-e Brane World Cosmology

    NASA Astrophysics Data System (ADS)

    Youm, Donam

    We study a varying electric charge brane world cosmology in the RS2 model obtained from a varying-speed-of-light brane world cosmology by redefining the system of units. We elaborate conditions under which the flatness problem and the cosmological constant problem can be resolved by such cosmological model.

  8. Novel Microstructures for Polymer-Liquid Crystal Composite Materials

    NASA Technical Reports Server (NTRS)

    Magda, Jules J.

    2004-01-01

    There are a number of interface-dominated composite materials that contain a liquid crystalline (LC) phase in intimate contact with an isotropic phase. For example, polymer- dispersed liquid crystals, used in the fabrication of windows with switchable transparency, consist of micron size LC droplets dispersed in an isotropic polymer matrix. Many other types of liquid crystal composite materials can be envisioned that might have outstanding optical properties that could be exploited in novel chemical sensors, optical switches, and computer displays. This research project was based on the premise that many of these potentially useful LC composite materials can only be fabricated under microgravity conditions where gravity driven flows are absent. In the ground-based research described below, we have focused on a new class of LC composites that we call thermotropic- lyotropic liquid crystal systems (TLLCs). TLLCs consist of nanosize droplets of water dispersed in an LC matrix, with surfactants at the interface that stabilize the structure. By varying the type of surfactant one can access almost an infinite variety of unusual LC composite microstructures. Due to the importance of the interface in these types of systems, we have also developed molecular simulation models for liquid crystals at interfaces, and made some of the first measurements of the interfacial tension between liquid crystals and water.

  9. Twelve years of tracking 52-Hz whale calls from a unique source in the North Pacific

    NASA Astrophysics Data System (ADS)

    Watkins, William A.; Daher, Mary Ann; George, Joseph E.; Rodriguez, David

    2004-12-01

    A unique whale call with 50-52 Hz emphasis from a single source has been tracked over 12 years in the central and eastern North Pacific. These calls, referred to as 52-Hz calls, were monitored and analyzed from acoustic data recorded by hydrophones of the US Navy Sound Surveillance System (SOSUS) and other arrays. The calls were noticed first in 1989, and have been detected and tracked since 1992. No other calls with similar characteristics have been identified in the acoustic data from any hydrophone system in the North Pacific basin. Only one series of these 52-Hz calls has been recorded at a time, with no call overlap, suggesting that a single whale produced the calls. The calls were recorded from August to February with most in December and January. The species producing these calls is unknown. The tracks of the 52-Hz whale were different each year, and varied in length from 708 to 11,062 km with travel speeds ranging from 0.7 to 3.8 km/h. Tracks included (A) meandering over short ranges, (B) predominantly west-to-east movement, and (C) mostly north-to-south travel. These tracks consistently appeared to be unrelated to the presence or movement of other whale species (blue, fin and humpback) monitored year-round with the same hydrophones.

  10. Antiphonal call timing in marmosets is behaviorally significant: Interactive playback experiments

    PubMed Central

    Miller, Cory T.; Beck, Kaylin; Meade, Brooke; Wang, Xiaoqin

    2013-01-01

    Studies of primate vocal communication systems have generally focused on vocalizations and the information they convey to conspecifics. But the vocalizations are not the only sources of information. Aspects of each species vocal behaviors are also likely to be communicatively rich as well. During vocal interactions, for example, the latency delay between the calls could communicate an important message to the signal receiver, such as an interest and willingness to socialize. Here we employed novel, interactive playback software to address this issue in the antiphonal calling behavior of common marmosets. In these experiments, we parametrically varied the latency delay of antiphonal call stimuli and measured its effects on subjects’ resultant vocal behavior. Results showed that marmosets produced successively fewer antiphonal call responses during test conditions with increasing latency delays. Moreover, although subjects produced significantly more antiphonal than spontaneous calls in conditions with antiphonal call timing delays up to 9s, a longer delay resulted in a significant decline in calling. These data suggest that antiphonal call timing is a salient cue for maintaining antiphonal calling interactions and may be used by marmosets to determine whether a subsequent call is produced in response to or independently of their own. PMID:19597736

  11. Augmented video calls on mobile devices

    NASA Astrophysics Data System (ADS)

    Zhu, Fengqing; Lv, Fengjun

    2013-09-01

    We present a system and a method to segment the head-shoulder image of participants in a video call using mobile devices such as a smartphone or a tablet. Participants can choose to send only the segmented head-shoulder foreground image and overlay it on top of a static background image or a background video on the receiver side of the video call, as well as to replace the background of the caller himself/herself during the video call. Our proposed method extracts the head-shoulder area of each video frame based on detected face region, superpixel clustering, and efficient label propagation.

  12. Acoustic similarity to parental calls promotes response to unfamiliar calls in zebra finch fledglings

    E-print Network

    Richner, Heinz

    Acoustic similarity to parental calls promotes response to unfamiliar calls in zebra finch: acoustic communication acoustic similarity individual recognition Taeniopygia guttata zebra finch Individual recognition, using acoustic, visual or olfactory individual signatures, is crucial for the coor

  13. Call for PapersCall for Papers Annals of Operations Research

    E-print Network

    of Operations Research seeks submissions for a special volume on Stochastic Methods in Reliability and RiskCall for PapersCall for Papers Annals of Operations Research Special Volume: Stochastic Methods in Reliability and Risk Management _______________________________________________________________ The Annals

  14. Determination of optimal call admission control policy in wireless networks

    Microsoft Academic Search

    Wenlong Ni; Wei Li; Mansoor Alam

    2009-01-01

    This paper investigates the optimal call admission control (CAC) policy for non-priority scheme (NPS) and reserved channel scheme (RCS) in wireless networks, respectively. Both new call and handoff call arrival processes are assumed to be Poisson processes, and the call holding times are exponentially distributed with different rate for new call and handoff calls. Admitting each call would bring a

  15. Call for Papers International Workshop on

    E-print Network

    Dolev, Shlomi

    Call for Papers International Workshop on Optical SuperComputing (OSC08) August 24, 2008, Vienna, Austria http://www.cs.bgu.ac.il/osc2008 http://www.cs.ubbcluj.ro/moltean/osc2008 In conjuction with the

  16. Call for Papers International Workshop on

    E-print Network

    Beimel, Amos

    Call for Papers International Workshop on Optical SuperComputing (OSC08) August 24, 2008, Vienna, Austria http://www.cs.bgu.ac.il/osc2008 http://www.cs.ubbcluj.ro/moltean/osc2008 In conjunction with the

  17. 2012BROOKHAVEN NATIONAL LABORATORY CALL FOR PAPERS

    E-print Network

    Ohta, Shigemi

    YOUNG RESEARCHER SYMPOSIUM 2012BROOKHAVEN NATIONAL LABORATORY CALL FOR PAPERS YOUNG RESEARCHER SYMPOSIUM 2012BROOKHAVEN NATIONAL LABORATORY YOUNG RESEARCHER SYMPOSIUM 2012BROOKHAVEN NATIONAL LABORATORY YOUNG RESEARCHER SYMPOSIUM 2012BROOKHAVEN NATIONAL LABORATORY ELIGIBILITY All postdocs and graduate

  18. 2013BROOKHAVEN NATIONAL LABORATORY CALL FOR PAPERS

    E-print Network

    Ohta, Shigemi

    YOUNG RESEARCHER SYMPOSIUM 2013BROOKHAVEN NATIONAL LABORATORY CALL FOR PAPERS YOUNG RESEARCHER SYMPOSIUM 2012BROOKHAVEN NATIONAL LABORATORY YOUNG RESEARCHER SYMPOSIUM 2012BROOKHAVEN NATIONAL LABORATORY YOUNG RESEARCHER SYMPOSIUM 2012BROOKHAVEN NATIONAL LABORATORY ELIGIBILITY All postdocs and graduate

  19. 2014BROOKHAVEN NATIONAL LABORATORY CALL FOR PAPERS

    E-print Network

    Ohta, Shigemi

    YOUNG RESEARCHER SYMPOSIUM 2014BROOKHAVEN NATIONAL LABORATORY CALL FOR PAPERS YOUNG RESEARCHER SYMPOSIUM 2012BROOKHAVEN NATIONAL LABORATORY YOUNG RESEARCHER SYMPOSIUM 2012BROOKHAVEN NATIONAL LABORATORY YOUNG RESEARCHER SYMPOSIUM 2012BROOKHAVEN NATIONAL LABORATORY ELIGIBILITY All postdocs and graduate

  20. Segmental structure in banded mongoose calls

    PubMed Central

    2012-01-01

    In complex animal vocalizations, such as bird or whale song, a great variety of songs can be produced via rearrangements of a smaller set of 'syllables', known as 'phonological syntax' or 'phonocoding' However, food or alarm calls, which function as referential signals, were previously thought to lack such combinatorial structure. A new study of calls in the banded mongoose Mungos mungo provides the first evidence of phonocoding at the level of single calls. The first portion of the call provides cues to the identity of the caller, and the second part encodes its current activity. This provides the first example known in animals of something akin to the consonants and vowels of human speech. See research article http://www.biomedcentral.com/1741-7007/10/97 PMID:23206277

  1. Hydraulic fractur ing--also called hy

    E-print Network

    Goodman, Robert M.

    Hydraulic fractur ing--also called hy drofracking or frack ing--is a process where large volumes) is an aquatic invasive spe cies listed on the USDA's federal noxious weeds list (http:// www.aphis.usda.gov/plant_health

  2. Call for Applications: 2012 Advanced Institute on

    E-print Network

    and how to effectively manage disaster risks has grown considerably in recent years) project) that investigate how natural hazards do ­ or do not ­ become of Disasters ­ Southeast Asia 1 Call for Applications: 2012

  3. System Identification: Time Varying and Nonlinear Methods 

    E-print Network

    Majji, Manoranjan

    2010-07-14

    Novel methods of system identification are developed in this dissertation. First set of methods are designed to realize time varying linear dynamical system models from input-output experimental data. The preliminary results obtained in a recent...

  4. System Identification: Time Varying and Nonlinear Methods

    E-print Network

    Majji, Manoranjan

    2010-07-14

    Novel methods of system identification are developed in this dissertation. First set of methods are designed to realize time varying linear dynamical system models from input-output experimental data. The preliminary results obtained in a recent...

  5. CAN GRAMMATICAL CALL HELP EFL WRITING INSTRUCTION?

    Microsoft Academic Search

    Hsien-Chin Liou; Samuel H. Wang; Yuli Hung-Yeh

    This is a research report of a one-year study which addresses whether and in what way grammatical CALL can help English writing instruction in an EFL setting, namely, in Taiwan, R.O.C. The study started with the implementation of CALL courseware which contains ten lessons of grammar exercises. The courseware featured (a) empirically based contents, results from error analysis of Chinese

  6. Calling cards for DNA-binding proteins

    PubMed Central

    Wang, Haoyi; Johnston, Mark; Mitra, Robi David

    2007-01-01

    Identifying genomic targets of transcription factors is fundamental for understanding transcriptional regulatory networks. Current technology enables identification of all targets of a single transcription factor, but there is no realistic way to achieve the converse: identification of all proteins that bind to a promoter of interest. We have developed a method that promises to fill this void. It employs the yeast retrotransposon Ty5, whose integrase interacts with the Sir4 protein. A DNA-binding protein fused to Sir4 directs insertion of Ty5 into the genome near where it binds; the Ty5 becomes a “calling card” the DNA-binding protein leaves behind in the genome. We constructed customized calling cards for seven transcription factors of yeast by including in each Ty5 a unique DNA sequence that serves as a “molecular bar code.” Ty5 transposition was induced in a population of yeast cells, each expressing a different transcription factor–Sir4 fusion and its matched, bar-coded Ty5, and the calling cards deposited into selected regions of the genome were identified, revealing the transcription factors that visited that region of the genome. In each region we analyzed, we found calling cards for only the proteins known to bind there: In the GAL1–10 promoter we found only calling cards for Gal4; in the HIS4 promoter we found only Gcn4 calling cards; in the PHO5 promoter we found only Pho4 and Pho2 calling cards. We discuss how Ty5 calling cards might be implemented for mapping all targets of all transcription factors in a single experiment. PMID:17623806

  7. EFFECTIVENESS OF CALL-BROADCAST SURVEYS FOR

    Microsoft Academic Search

    MONITORING MARSH BIRDS

    2005-01-01

    A???????.—Many species of marsh birds (e.g. rails and bierns) are believed to be declining in North America, yet we lack an eff ective monitoring program to estimate their population trends. Broadcast of prerecorded calls to elicit vocalizations is a commonly used method in surveys of marsh birds, but whether gains in detection and index precision outweigh the drawbacks of call-broadcast

  8. Inhibitors of calling behavior of Plodia interpunctella

    Microsoft Academic Search

    Akinori Hirashima; Yoko Shigeta; Tomohiko Eiraku; Eiichi Kuwano

    2003-01-01

    Some octopamine agonists were found to suppress the calling behavior of the stored product Indian meal moth, Plodia interpunctella. Compounds were screened using a calling behavior bioassay using female P. interpunctella. Four active derivatives, with inhibitory activity at the nanomolar range, were identified in order of decreasing activity: 2-(1-phenylethylamino)-2-oxazoline > 2-(2-ethyl,6- methylanilino)oxazolidine > 2-(2-methyl benzylamino)-2-thiazoline > 2-(2,6-diethylanilino)thiazolidine. Three-dimensional pharmacophore hypotheses

  9. Time-varying modulated lapped transforms

    Microsoft Academic Search

    J. Kovacevic; Martin Vetterli

    1993-01-01

    We consider the problem of time-varying orthonormal tilings of the time-frequency plane. A very elegant way of obtaining such tilings is by using time-varying modulated lapped transforms. We offer ways of constructing these, by using either boundary or overlapping modulated lapped transforms The advantage of using modulated lapped transforms is that all the filters, both at transitions and within decompositions,

  10. Methanotrophic communities in Australian woodland soils of varying salinity.

    PubMed

    Bissett, Andrew; Abell, Guy C J; Bodrossy, Levente; Richardson, Alan E; Thrall, Peter H

    2012-06-01

    Despite their large areas and potential importance as methane sinks, the role of methane-oxidizing bacteria (MOB) in native woodland soils is poorly understood. These environments are increasingly being altered by anthropogenic disturbances, which potentially alter ecosystem service provision. Dryland salinity is one such disturbance and is becoming increasingly prevalent in Australian soils. We used microarrays and analysis of soil physicochemical variables to investigate the methane-oxidizing communities of several Australian natural woodland soils affected to varying degrees by dryland salinity. Soils varied in terms of salinity, gravitational water content, NO(3)-N, SO(4)-S and Mg, all of which explained to a significant degree MOB community composition. Analysis of the relative abundance and diversity of the MOB communities also revealed significant differences between soils of different salinities. Type II and type Ib methanotrophs dominated the soils and differences in methanotroph communities existed between salinity groups. The low salinity soils possessed less diverse MOB communities, including most conspicuously, the low numbers or absence of type II Methylocystis phylotypes. The differences in MOB communities suggest niche separation of MOB across varying salinities, as has been observed in the closely related ammonia-oxidizing bacteria, and that anthropogenic disturbance, such as dryland salinity, has the potential to alter MOB community and therefore the methane uptake rates in soils in which disturbance occurs. PMID:22375901

  11. Mixed lipid bilayers with locally varying spontaneous curvature and bending.

    PubMed

    Gueguen, Guillaume; Destainville, Nicolas; Manghi, Manoel

    2014-08-01

    A model of lipid bilayers made of a mixture of two lipids with different average compositions on both leaflets, is developed. A Landau Hamiltonian describing the lipid-lipid interactions on each leaflet, with two lipidic fields ? 1 and ? 2, is coupled to a Helfrich one, accounting for the membrane elasticity, via both a local spontaneous curvature, which varies as C 0 + C 1(? 1 - ? 2/2), and a bending modulus equal to ? 0 + ? 1(? 1 + ? 2)/2. This model allows us to define curved patches as membrane domains where the asymmetry in composition, ? 1 - ? 2, is large, and thick and stiff patches where ? 1 + ? 2 is large. These thick patches are good candidates for being lipidic rafts, as observed in cell membranes, which are composed primarily of saturated lipids forming a liquid-ordered domain and are known to be thick and flat nano-domains. The lipid-lipid structure factors and correlation functions are computed for globally spherical membranes and planar ones and for a whole set of parameters including the surface tension and the coupling in the two leaflet compositions. Phase diagrams are established, within a Gaussian approximation, showing the occurrence of two types of Structure Disordered phases, with correlations between either curved or thick patches, and an Ordered phase, corresponding to the divergence of the structure factor at a finite wave vector. The varying bending modulus plays a central role for curved membranes, where the driving force ? 1 C 0 (2) is balanced by the line tension, to form raft domains of size ranging from 10 to 100 nm. For planar membranes, raft domains emerge via the cross-correlation with curved domains. A global picture emerges from curvature-induced mechanisms, described in the literature for planar membranes, to coupled curvature- and bending-induced mechanisms in curved membranes forming a closed vesicle. PMID:25160487

  12. Is the Frequency Content of the Calls in North American Treefrogs Limited by Their Larynges?

    PubMed Central

    2014-01-01

    A high diversity of mating calls is found among frogs. The calls of most species, however, are simple, in comparison to those of mammals and birds. In order to determine if the mechanics of the larynx could explain the simplicity of treefrog calls, the larynges of euthanized males were activated with airflow. Laryngeal airflow, sound frequency, and sound intensity showed a positive direct relationship with the driving air pressure. While the natural calls of the studied species exhibit minimal frequency modulation, their larynges produced about an octave of frequency modulation in response to varying pulmonary pressure. Natural advertisement calls are produced near the higher extreme of frequency obtained in the laboratory and at a slightly higher intensity (6?dB). Natural calls also exhibit fewer harmonics than artificial ones, because the larynges were activated with the mouth of the animal open. The results revealed that treefrog larynges allow them to produce calls spanning a much greater range of frequencies than observed in nature; therefore, the simplicity of the calls is not due to a limited frequency range of laryngeal output. Low frequencies are produced at low intensities, however, and this could explain why treefrogs concentrate their calling at the high frequencies. PMID:25332838

  13. Mobbing calls signal predator category in a kin group-living bird species

    PubMed Central

    Griesser, Michael

    2009-01-01

    Many prey species gather together to approach and harass their predators despite the associated risks. While mobbing, prey usually utter calls and previous experiments have demonstrated that mobbing calls can convey information about risk to conspecifics. However, the risk posed by predators also differs between predator categories. The ability to communicate predator category would be adaptive because it would allow other mobbers to adjust their risk taking. I tested this idea in Siberian jays Perisoreus infaustus, a group-living bird species, by exposing jay groups to mounts of three hawk and three owl species of varying risks. Groups immediately approached to mob the mount and uttered up to 14 different call types. Jays gave more calls when mobbing a more dangerous predator and when in the presence of kin. Five call types were predator-category-specific and jays uttered two hawk-specific and three owl-specific call types. Thus, this is one of the first studies to demonstrate that mobbing calls can simultaneously encode information about both predator category and the risk posed by a predator. Since antipredator calls of Siberian jays are known to specifically aim at reducing the risk to relatives, kin-based sociality could be an important factor in facilitating the evolution of predator-category-specific mobbing calls. PMID:19474047

  14. The communicative content of the common marmoset phee call during antiphonal calling

    PubMed Central

    Miller, Cory T.; Mandel, Katherine; Wang, Xiaoqin

    2011-01-01

    Vocalizations are a dominant means of communication for numerous species, including nonhuman primates. These acoustic signals are encoded with a rich array of information available to signal receivers that can be used to guide species-typical behaviors. Here we examined the communicative content of common marmoset phee calls, the species-typical long distance contact call, during antiphonal calling. This call type has a relatively stereotyped acoustic structure, consisting of a series of long tonal pulses. Analyses revealed that calls could be reliably classified based on the individual identity and social group of the caller. Our analyses did not, however, correctly classify phee calls recorded under different social contexts, though differences were evident along individual acoustic parameters. Further tests of antiphonal calling interactions showed that spontaneously produced phee calls differ from antiphonal phee calls in their peak and end frequency, which may be functionally significant. Overall, this study shows that the marmoset phee call has a rich communicative content encoded in its acoustic structure available to conspecifics during antiphonal calling exchanges. PMID:20549761

  15. Euclidean Reconstruction from Image Sequences with Varying and Unknown Focal Length and Principal Point

    E-print Network

    Lunds Universitet

    Euclidean Reconstruction from Image Sequences with Varying and Unknown Focal Length and Principal. These type of cameras, here called cameras with Euclidean image pla- nes, represent rigid projections where to reconstruct an unknown object from images taken by a camera with Euclidean image plane up to simi- larity

  16. Calculation of higher moments of the neutron multiplication process in a time-varying medium

    E-print Network

    Pázsit, Imre

    Available online 20 April 2007 Abstract The zero-power reactor noise theory in a steady neutron multiplying and the power reactor noise. For a time-varying medium in which the transition probability randomly fluctuates and Stege- mann, 1971; Williams, 1974). This area is called the zero-power reactor noise or the zero-power

  17. Functional morphology of Richardson's ground squirrel, Spermophilus richardsonii, alarm calls: the meaning

    E-print Network

    Wilson, David R.

    squirrels vary in terms of the acoustic structure of their primary syllables and the inclusion of brief and after signal reception. Chucks thus promote increased and lasting vigilance on the part of call facilitates the orientation of receivers to the signaller. Multiple acoustic parameters of Richardson's ground

  18. Call Admission Control Approaches in Beyond 3G Networks Using Multi Criteria Decision Making

    Microsoft Academic Search

    H. S. R. Babu; G. Shankar; P. S. Satyanarayana

    2009-01-01

    The next generation wireless networks (NGWN) should cater the varied requirements of the user and applications. The call admission control (CAC) is one of the radio resource management (RRM) technique used in the wireless networks. Unlike the CAC in homogeneous wireless networks the CAC in next generation wireless networks is very complex. In the next generation heterogeneous wireless networks, a

  19. Pollinator effectiveness varies with experimental shifts in flowering time.

    PubMed

    Rafferty, Nicole E; Ives, Anthony R

    2012-04-01

    The earlier flowering times exhibited by many plant species are a conspicuous sign of climate change. Altered phenologies have caused concern that species could suffer population declines if they flower at times when effective pollinators are unavailable. For two perennial wildflowers, Tradescantia ohiensis and Asclepias incarnata, we used an experimental approach to explore how changing phenology affects the taxonomic composition of the pollinator assemblage and the effectiveness of individual pollinator taxa. After finding in the previous year that fruit set varied with flowering time, we manipulated flowering onset in greenhouses, placed plants in the field over the span of five weeks, and measured pollinator effectiveness as the number of seeds produced after a single visit to a flower. The average effectiveness of pollinators and the expected rates of pollination success were lower for plants of both species flowering earlier than for plants flowering at historical times, suggesting there could be reproductive costs to earlier flowering. Whereas for A. incarnata, differences in average seed set among weeks were due primarily to changes in the composition of the pollinator assemblage, the differences for T. ohiensis were driven by the combined effects of compositional changes and increases over time in the effectiveness of some pollinator taxa. Both species face the possibility of temporal mismatch between the availability of the most effective pollinators and the onset of flowering, and changes in the effectiveness of individual pollinator taxa through time may add an unexpected element to the reproductive consequences of such mismatches. PMID:22690631

  20. Pollinator effectiveness varies with experimental shifts in flowering time

    PubMed Central

    Rafferty, Nicole E.; Ives, Anthony R.

    2013-01-01

    The earlier flowering times exhibited by many plant species are a conspicuous sign of climate change. Altered phenologies have caused concern that species could suffer population declines if they flower at times when effective pollinators are unavailable. For two perennial wildflowers, Tradescantia ohiensis and Asclepias incarnata, we used an experimental approach to explore how changing phenology affects the taxonomic composition of the pollinator assemblage and the effectiveness of individual pollinator taxa. After finding in the previous year that fruit set varied with flowering time, we manipulated flowering onset in greenhouses, placed plants in the field over the span of five weeks, and measured pollinator effectiveness as the number of seeds produced after a single visit to a flower. The average effectiveness of pollinators and the expected rates of pollination success were lower for plants of both species flowering earlier than for plants flowering at historical times, suggesting there could be reproductive costs to earlier flowering. Whereas for A. incarnata, differences in average seed set among weeks were due primarily to changes in the composition of the pollinator assemblage, the differences for T. ohiensis were driven by the combined effects of compositional changes and increases over time in the effectiveness of some pollinator taxa. Both species face the possibility of temporal mismatch between the availability of the most effective pollinators and the onset of flowering, and changes in the effectiveness of individual pollinator taxa through time may add an unexpected element to the reproductive consequences of such mismatches. PMID:22690631

  1. The growth and chemical composition of soybeans as influenced by varying sulphur applications, varying soluble salts and varying calcium: sodium ratios 

    E-print Network

    Peters, Doyle Burne

    1951-01-01

    Qsslvs vS? COLt, a), UG1 R~t;assign vs, t"h~sa amus 8:i~sAm vs, :as, mein@ HsoGi1'%at 0+05 Rsttikes4 0 03. ?217 . 283 ~ ZL7 1, 0 M?E, /gm? g Q?9 ?? 0?7 0 Q 0. 5 0, 8 sa Qg 7$& ~ 0 R 4 7 500. 3?25~1 1?@!1 Sulphur Salts Ratio Q&s, per acre... 1. 81 ' 7?50sl 3?850. 1?81A 7?50&1 3?85$1 l?81ll JA Jg ~ 38 ?38 ?38 4F ~ 30 ?36 ~ 34 -34 31 t 32 ?41 ~ 38 ?34 . 83 347 3?00 I?7) 3 ?31 8?68 M9 3. 55 3. 10 3?0k 2, BIO tdp k?08 8?48 1?59 2?89 I?58 8?Q 8 85 8, 85...

  2. Close-Call Action Log Form

    NASA Technical Reports Server (NTRS)

    Spuler, Linda M.; Ford, Patricia K.; Skeete, Darren C.; Hershman, Scot; Raviprakash, Pushpa; Arnold, John W.; Tran, Victor; Haenze, Mary Alice

    2005-01-01

    "Close Call Action Log Form" ("CCALF") is the name of both a computer program and a Web-based service provided by the program for creating an enhanced database of close calls (in the colloquial sense of mishaps that were avoided by small margins) assigned to the Center Operations Directorate (COD) at Johnson Space Center. CCALF provides a single facility for on-line collaborative review of close calls. Through CCALF, managers can delegate responses to employees. CCALF utilizes a pre-existing e-mail system to notify managers that there are close calls to review, but eliminates the need for the prior practices of passing multiple e-mail messages around the COD, then collecting and consolidating them into final responses: CCALF now collects comments from all responders for incorporation into reports that it generates. Also, whereas it was previously necessary to manually calculate metrics (e.g., numbers of maintenance-work orders necessitated by close calls) for inclusion in the reports, CCALF now computes the metrics, summarizes them, and displays them in graphical form. The reports and all pertinent information used to generate the reports are logged, tracked, and retained by CCALF for historical purposes.

  3. Composite structural materials

    NASA Technical Reports Server (NTRS)

    Ansell, G. S.; Loewy, R. G.; Wiberley, S. E.

    1982-01-01

    The promise of filamentary composite materials, whose development may be considered as entering its second generation, continues to generate intense interest and applications activity. Fiber reinforced composite materials offer substantially improved performance and potentially lower costs for aerospace hardware. Much progress has been achieved since the initial developments in the mid 1960's. Rather limited applications to primary aircraft structure have been made, however, mainly in a material-substitution mode on military aircraft, except for a few experiments currently underway on large passenger airplanes in commercial operation. To fulfill the promise of composite materials completely requires a strong technology base. NASA and AFOSR recognize the present state of the art to be such that to fully exploit composites in sophisticated aerospace structures, the technology base must be improved. This, in turn, calls for expanding fundamental knowledge and the means by which it can be successfully applied in design and manufacture.

  4. Wireless world widens nurse call options.

    PubMed

    Baillie, Jonathan

    2014-01-01

    With wireless technology now an integral part of all our lives, and miniaturisation of computing power having made even hand-held portable devices such as mobile phones powerful tools in their own right, HEJ editor, Jonathan Baillie, spoke to specialist in wireless nurse call systems, Courtney-Thorne, to discuss some of its key recent product innovations, and see what impact it feels developments such as 'cloud' technology will have on the bringing of more technology into the nurse call sector as 'nurse and carer tools'. PMID:24516936

  5. Solar mass-varying neutrino oscillations

    E-print Network

    V. Barger; Patrick Huber; Danny Marfatia

    2005-09-30

    We propose that the solar neutrino deficit may be due to oscillations of mass-varying neutrinos (MaVaNs). This scenario elucidates solar neutrino data beautifully while remaining comfortably compatible with atmospheric neutrino and K2K data and with reactor antineutrino data at short and long baselines (from CHOOZ and KamLAND). We find that the survival probability of solar MaVaNs is independent of how the suppression of neutrino mass caused by the acceleron-matter couplings varies with density. Measurements of MeV and lower energy solar neutrinos will provide a rigorous test of the idea.

  6. Solar mass-varying neutrino oscillations.

    PubMed

    Barger, V; Huber, Patrick; Marfatia, Danny

    2005-11-18

    We propose that the solar neutrino deficit may be due to oscillations of mass-varying neutrinos (MaVaNs). This scenario elucidates solar neutrino data beautifully while remaining comfortably compatible with atmospheric neutrino and K2K data and with reactor antineutrino data at short and long baselines (from CHOOZ and KamLAND). We find that the survival probability of solar MaVaNs is independent of how the suppression of neutrino mass caused by the acceleron-matter couplings varies with density. Measurements of MeV and lower energy solar neutrinos will provide a rigorous test of the idea. PMID:16384133

  7. Solar Mass-Varying Neutrino Oscillations

    SciTech Connect

    Barger, V.; Huber, Patrick [Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States); Marfatia, Danny [Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045 (United States)

    2005-11-18

    We propose that the solar neutrino deficit may be due to oscillations of mass-varying neutrinos (MaVaNs). This scenario elucidates solar neutrino data beautifully while remaining comfortably compatible with atmospheric neutrino and K2K data and with reactor antineutrino data at short and long baselines (from CHOOZ and KamLAND). We find that the survival probability of solar MaVaNs is independent of how the suppression of neutrino mass caused by the acceleron-matter couplings varies with density. Measurements of MeV and lower energy solar neutrinos will provide a rigorous test of the idea.

  8. The Theory and Practice of Transforming Call-by-need into Call-by-value

    Microsoft Academic Search

    Alan Mycroft

    1980-01-01

    Call-by-need (which is an equivalent but more efficient implementation of call-by-name for applicative languages) is quite expensive with current hardware and also does not permit full use of the tricks (such as memo functions and recursion removal) associated with the cheaper call-by-value. However the latter mechanism may fail to terminate for perfectly well-defined equations and also invalidates some program transformation

  9. Energy Absorption in Chopped Carbon Fiber Compression Molded Composites

    SciTech Connect

    Starbuck, J.M.

    2001-07-20

    In passenger vehicles the ability to absorb energy due to impact and be survivable for the occupant is called the ''crashworthiness'' of the structure. To identify and quantify the energy absorbing mechanisms in candidate automotive composite materials, test methodologies were developed for conducting progressive crush tests on composite plate specimens. The test method development and experimental set-up focused on isolating the damage modes associated with the frond formation that occurs in dynamic testing of composite tubes. Quasi-static progressive crush tests were performed on composite plates manufactured from chopped carbon fiber with an epoxy resin system using compression molding techniques. The carbon fiber was Toray T700 and the epoxy resin was YLA RS-35. The effect of various material and test parameters on energy absorption was evaluated by varying the following parameters during testing: fiber volume fraction, fiber length, fiber tow size, specimen width, profile radius, and profile constraint condition. It was demonstrated during testing that the use of a roller constraint directed the crushing process and the load deflection curves were similar to progressive crushing of tubes. Of all the parameters evaluated, the fiber length appeared to be the most critical material parameter, with shorter fibers having a higher specific energy absorption than longer fibers. The combination of material parameters that yielded the highest energy absorbing material was identified.

  10. Web-Based CALL to Listening Comprehension

    ERIC Educational Resources Information Center

    Chen, Li-Mei; Zhang, Ruiming

    2010-01-01

    This study investigated effectiveness of Web-based CALL on listening comprehension. Both students' academic performance and attitudes were examined. T-tests were used to analyze the results of students' academic performance. Descriptive statistics interpreted students' attitudes toward this learning. Students' participation was also recorded.…

  11. Bridging CALL & HCI: Input from Participatory Design

    ERIC Educational Resources Information Center

    Cardenas-Claros, Monica S.; Gruba, Paul A.

    2010-01-01

    Participatory design (PD), or the collaboration between software engineers and end users throughout the design process, may help improve CALL design practices. In this case study, four ESL learners, a software designer, and a language teacher created and evaluated a series of paper prototypes concerning help options in computer-based second…

  12. Modeling Learning Processes in Lexical CALL.

    ERIC Educational Resources Information Center

    Goodfellow, Robin; Laurillard, Diana

    1994-01-01

    Studies the performance of a novice Spanish student using a Computer-assisted language learning (CALL) system designed for vocabulary enlargement. Results indicate that introspective evidence may be used to validate performance data within a theoretical framework that characterizes the learning approach as "surface" or "deep." (25 references)…

  13. winter 07/08 Call for Collaboration

    E-print Network

    Mottram, Nigel

    winter 07/08 Call for Collaboration Requests A novel design concept for the `Gecko con- trolled design concepts for the `gecko controlled flow liner' for body/device interfaces in the provision according specific design criteria? · Can we develop liner adhesion by mim- icking gecko adhesive

  14. Answering the Call of the Wild.

    ERIC Educational Resources Information Center

    Dyer, Daniel

    1988-01-01

    Recounts a teacher's experience during his sabbatical leave of visiting the country about which Jack London wrote in "Call of the Wild" and other books. The journey which was initiated to learn more about the author and gather interesting teaching materials for teaching Literature. (NH)

  15. Call for Papers General Co-Chairs

    E-print Network

    Politècnica de Catalunya, Universitat

    techniques · Novel architectures for wavelength routers (optical nodes) · Multi-layer design of optical · Signalling for all-optical networks · Measurement, monitoring and supervision techniques · Optical network performance monitoring · Optical multicasting · Call admission control and QoS- awareness in optical networks

  16. Intrusion Detection Using Sequences of System Calls

    Microsoft Academic Search

    Steven A. Hofmeyr; Stephanie Forrest; Anil Somayaji

    1998-01-01

    A method is introducted for detecting intrusions at the level of privileged processes. Evidence is given that short sequences of system calls executed by running processes are a good discriminator between normal and abnormal op- erating characteristics of several common UNIX programs. Normal behavior is collected in two ways: Synthetically, by exercising as many normal modes of usage of a

  17. Call admission control in wireless multimedia networks

    Microsoft Academic Search

    Novella Bartolini; Imrich Chlanitac

    2002-01-01

    This paper addresses the call admission control problem for the multimedia services that characterize the third generation of wireless networks. In the proposed model each cell has to serve a variety of classes of requests that differ in their traffic parameters, bandwidth requirements and in the priorities while ensuring proper quality of service levels to all of them. A semi

  18. Optimized call admission control in wireless networks

    Microsoft Academic Search

    Shengdong Xie; Meng Wu

    2008-01-01

    Traditional traffic rate regulation\\/degradation schemes in call admission control (CAC) seldom take rate degradation optimization into consideration, thus can not obtain the perfect grade of service (GoS) in session layer. In this paper, we propose an enhanced rate degradation CAC (ERDCAC) scheme in multimedia wireless networks, which is an extension and optimization of the rate regulation CAC scheme. We introduce

  19. Call for Nominations TRADITION OF EXCELLENCE

    E-print Network

    Call for Nominations TRADITION OF EXCELLENCE Staff Awards Do you know someone working, nominate him or her for the Academic Affairs Tradition of Excellence Staff Awards. Nomination forms-4016) or online at http://provost.tamu.edu/special-events/tradition-of-excellence-awards. Reward and Recognition

  20. Learner Activities in a Collaborative CALL Task

    ERIC Educational Resources Information Center

    Leahy, C.

    2008-01-01

    This paper briefly discusses different research approaches in CALL and makes a case for applying grounded theory (GT) to data gathered from an electronic role-play conducted in L2. The article shows that this method can help gain a better understanding of what learners do when engaged in the task. Through the process of open coding, four…

  1. A Call for School Counseling Practitioner Research

    ERIC Educational Resources Information Center

    Kaffenberger, Carol J.

    2012-01-01

    Despite the repeated call to increase the number of practitioner research manuscripts being published in counseling publications, practitioner research accounts for less than five percent of all manuscripts published. This article describes the challenges faced by practitioners seeking to publish their research, defines practitioner research, and…

  2. Tesla TechFair Call for Proposals

    E-print Network

    Tesla TechFair Call for Proposals Thayer School of Engineering and the Hopkins Center are celebrating Nikola Tesla, in conjunction with Tesla in New York, an opera by filmmaker Jim Jarmusch & composer Phil Kline. Thayer will host a Tesla TechFair, including a panel discussion and demonstrations

  3. 78 FR 76218 - Rural Call Completion

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-12-17

    ...are prohibited from blocking voice traffic to or from the PSTN...service that enables real-time voice communications that originate...without the correct caller identification, which is a common call quality...originating long-distance voice service providers to...

  4. Call for Participation ESA WAE WABI

    E-print Network

    Brodal, Gerth Stølting

    BRICS Call for Participation ALGO 2001 ESA WAE WABI BRICS, University of Aarhus, Denmark August 28--31, 2001 www.brics.dk/algo2001 ALGO 2001 covers the jointly organized conferences and workshops ESA 2001 2001 -- 1st Workshop on Algorithms in BioInformatics On Monday August 27, ALGO 2001 is preceded

  5. Call for Papers IEEE TRANSACTIONS ON ROBOTICS

    E-print Network

    Davison, Andrew

    Call for Papers IEEE TRANSACTIONS ON ROBOTICS Special Issue on Visual SLAM In recent years Transactions on Robotics (T-RO) is to publish outstanding results in the rapidly progressing subject of visual with the potential of guiding autonomous robots in their exploration and operation in large and complex environments

  6. Call for Papers Electronic Commerce Research

    E-print Network

    Vouyioukas, Demosthenes

    Call for Papers Electronic Commerce Research Springer Special Issue on IT Convergence and Security disciplines related to IT convergence and security. The papers will be peer reviewed and will be selected on the basis of their quality and relevance to the theme of this special issue. Papers on practical as well

  7. Call for Papers Special Issue of

    E-print Network

    Atiquzzaman, Mohammed

    Call for Papers Special Issue of International Journal of Computer Systems Science & Engineering on ATM Switching Papers are solicited for a special issue of the International Journal of Computer. Electronic (PostScript only) submissions are encouraged. Authors should follow the IJCSSE manuscript

  8. CALL FOR PAPERS www.csaworkshop.org

    E-print Network

    Gamble, R. F.

    CALL FOR PAPERS www.csaworkshop.org IEEE 2014 Second International Workshop on Cloud Security original papers on increasing cloud resiliency and trustworthiness through security auditing as applied also welcomes survey papers and practitioner experiences. Topics of interest to CSAW 2014 include

  9. CALL FOR PAPERS International Conference on

    E-print Network

    Grout, Vic

    .haspel@umb.edu SUBMISSION PROCEDURES: Papers will be accepted only by electronic submission in PDF format only. A full paperCALL FOR PAPERS 6th International Conference on Bioinformatics and Computational Biology March 24-26, 2014 - Las Vegas, Nevada USA Conference website: http://www.cs.umb.edu/bicob ***** Paper Submission

  10. Call for Paper 3rd International Workshop

    E-print Network

    van der Torre, Leon

    2nd Call for Paper 3rd International Workshop on Normative Multiagent Systems (NorMAS 2008) 15 of Behaviour (http://normas.di.unito.it/zope/aisb05/). The best papers were presented in a double special issue://www.dagstuhl.de/en/program/calendar/semhp/?semnr=07122). The best papers were presented in a forthcoming special issue of Journal of Autonomous Agents

  11. CALL FOR PAPERS 2006 International Symposium on

    E-print Network

    Petrank, Erez

    ISMM â??06 ISMM â??06 CALL FOR PAPERS 2006 International Symposium on Memory Management (ISMM) Ottawa are published by the Association for Computing Machinery (ACM). ISMM solicits full­length papers on all areas of memory management. Survey papers that present an aspect of memory management with a new clarity

  12. Call for Papers Special issue on

    E-print Network

    Kreinovich, Vladik

    ://comst.wiwi.hu-berlin.de. The submission deadline is April 15, 2005. Electronic format submission is strongly encouraged. Papers mustCall for Papers Special issue on SSS TTT AAA TTT III SSS TTT III CCC AAA LLL AAA NNN AAA LLL YYY their papers to the special issue editor. The papers must contain original unpublished work

  13. Call For Papers Second European Workshop on

    E-print Network

    Lucas, Peter

    Call For Papers Second European Workshop on Probabilistic Graphical Models PGM'04 4­8 October, 2004 of the workshop, the number of accepted papers will be limited to 30-40, and there will be no parallel sessions their papers elec- tronically. Abstract registration: 28th May, 2004; paper sub- mission deadline: 1st June

  14. Call For Papers Special issue of

    E-print Network

    Yao, Xin

    Call For Papers Special issue of IEEE Transactions on Evolutionary Computation on Analysis-of-the-art in the analysis and design of representations and operators. We are therefore soliciting papers that discuss preferably be submitted electronically to one of the guest editors, or six copies should be send by regular

  15. CALL FOR PAPERS Special issue of

    E-print Network

    Margenstern, Maurice

    CALL FOR PAPERS Special issue of INTERNATIONAL JOURNAL OF FOUNDATIONS OF COMPUTER SCIENCE-reproduction and other tasks, universality and decidability in the real field Please, submit an electronic version of your submission as a .ps or .pdf file to be sent electronically to one of the guest editors by December

  16. Council on Foreign Relations Academic Conference Call

    E-print Network

    on Latin America and U.S. foreign policy. Dr. Sweig's book "Inside the Cuban Revolution: Fi- del CastroCouncil on Foreign Relations Academic Conference Call "Global Brazil" Thursday, December 8, 2011 12 board of "Foreign Affairs Latinoa- mérica," and served as a consultant on Latin American affairs

  17. "The Call of the Wild": Thematic Unit.

    ERIC Educational Resources Information Center

    Prinsen, Tammy

    This unit intends for students to explore various literary devices such as theme, characterization, and vocabulary while they read Jack London's "The Call of the Wild." While reading this text, students will explore the relationship of these devices in connection to the unit's overall theme: survival. Students will be exposed to history, new…

  18. Call for Papers IEEE Signal Processing Society

    E-print Network

    Nehorai, Arye

    · Interferometry, optical systems, multi-function operations, impulsive systems, tomography and SAR · PolarimetryCall for Papers IEEE Signal Processing Society Special Issue on Adaptive Waveform Design for Agile have to be optimally and adaptively integrated with electromagnetic phenomenology and other available

  19. Inhibitors of calling behavior of Plodia interpunctella.

    PubMed

    Hirashima, Akinori; Shigeta, Yoko; Eiraku, Tomohiko; Kuwano, Eiichi

    2003-01-01

    Some octopamine agonists were found to suppress the calling behavior of the stored product Indian meal moth, Plodia interpunctella. Compounds were screened using a calling behavior bioassay using female P. interpunctella. Four active derivatives, with inhibitory activity at the nanomolar range, were identified in order of decreasing activity: 2-(1-phenylethylamino)-2-oxazoline > 2-(2-ethyl,6-methylanilino)oxazolidine > 2-(2-methyl benzylamino)-2-thiazoline > 2-(2,6-diethylanilino)thiazolidine. Three-dimensional pharmacophore hypotheses were built from a set of 15 compounds. Among the ten common-featured models generated by the program Catalyst/HipHop, a hypothesis including a hydrogen-bond acceptor lipid, a hydrophobic aromatic and two hydrophobic aliphatic features was considered to be essential for inhibitory activity in the calling behavior. Active compounds mapped well onto all the hydrogen-bond acceptor lipid, hydrophobic aromatic and hydrophobic aliphatic features of the hypothesis. On the other hand, less active compounds were shown not to achieve the energetically favorable conformation that is found in the active molecules in order to fit the 3D common-feature pharmacophore models. The present studies demonstrate that inhibition of calling behavior is via an octopamine receptor. PMID:15841221

  20. Call transcript segmentation using word cooccurrence model

    Microsoft Academic Search

    Shajith Ikbal; Karthik Visweswariah

    2010-01-01

    In this paper, we propose a word cooccurrence model to perform topic segmentation of call center conversational speech. This model is estimated from training data to discriminatively represent how likely various pairs of words are to cooccur within homogeneous topic segments. We show that such model provide an effective measure of lexical cohesion and hence provide useful evidence of topical

  1. gprof: a Call Graph Execution Profiler

    Microsoft Academic Search

    Susan L. Graham; Peter B. Kessler; Marshall K. McKusick

    1982-01-01

    Large complex programs are composed of many small routines that implement abstractions for the routines that call them. To be useful, an execution profiler must attribute execution time in a way that is significant for the logical structure of a program as well as for its textual decomposition. This data must then be displayed to the user in a convenient

  2. Looking Back: Tracing Trends in Canadian CALL

    ERIC Educational Resources Information Center

    Craven, Mary-Louise; Sinyor, Roberta

    2011-01-01

    "CCALLNET" ("The Canadian Computer-Assisted Language Learning Network at the Post-Secondary Level") was a semi-annual newsletter published from 1987 to 2002 that was distributed to colleagues across Canada who taught languages to university students. Its objective was to create a network of Canadian faculty interested in CALL by informing them…

  3. Sexual differences in cricket calling song recognition

    Microsoft Academic Search

    Gerald S. Pollack

    1982-01-01

    Phonotactic behavior was studied in male crickets,Teleogryllus oceanicus. Tethered flying males were presented with electronically synthesized calling song models in a two-choice phonotaxis assay, and their song preferences were determined and compared with previous findings for females.

  4. ***Call for volunteers*** Goldschmidt Conference 2012

    E-print Network

    Fabry, Frederic

    ***Call for volunteers*** Goldschmidt Conference 2012 June 24th to 29th ­ Palais des Congrès that take place during the week of the Goldschmidt conference (e.g. reception, registration, assisting during the pre- conference organization meeting Have a positive attitude, be dynamic and self

  5. COMMUNITY PRACTICE AWARD 2011 Call For Nominations

    E-print Network

    Sibille, Etienne

    COMMUNITY PRACTICE AWARD 2011 Call For Nominations The School of Social Work of the University established a Community Practice Award Fund that is administered through the School's Community Organization and Social Administration (COSA) concentration. The Community Practice Award ($1,000 student support account

  6. Academic Freedom: A Call for Research.

    ERIC Educational Resources Information Center

    Ochoa, Anna

    The need for research on academic freedom as it applies to the K-12 level is addressed. The existing literature in the area of academic freedom, while often critical, rhetorical, and prescriptive, never calls for research. Indeed, there are very few examples of research in this area. Two separate ERIC (Educational Research Information Center)…

  7. Relaxation Assessment with Varied Structured Milieu (RELAX).

    ERIC Educational Resources Information Center

    Cassel, Russell N.; Cassel, Susie L.

    1983-01-01

    Describes Relaxation Assessment with Varied Structured Milieu (RELAX), a clinical program designed to assess the degree to which an individual is able to demonstrate self-control for overall general relaxation. The program is designed for use with the Cassel Biosensors biofeedback equipment. (JAC)

  8. Time-Varying World Market Integration

    Microsoft Academic Search

    Geert Bekaert; Campbell R Harvey

    1995-01-01

    We propose a measure of capital market integration arising from a conditional regime-switching model. Our measure allows us to describe expected returns in countries that are segmented from world capital markets in one part of the sample and become integrated later in the sample. We find that a number of emerging markets exhibit time-varying integration. Some markets appear more integrated

  9. Boiling Radial Flow in Fractures of Varying

    E-print Network

    Stanford University

    apply only to a finite radius around the point of injection, higher values of heat flux and a boilingSGP-TR-166 Boiling Radial Flow in Fractures of Varying Wall Porosity Robb Allan Barnitt June 2000 and boiling convective heat transfer, with boiling flow in a rock fracture. A series of experiments observed

  10. Colour Constancy for Scenes with Varying Illumination

    E-print Network

    Barnard, Kobus

    Colour Constancy for Scenes with Varying Illumination Kobus Barnard 1 , Graham Finlayson 2 surface reflectance and illumination variation to solve for colour constancy. Most colour constancy algorithms assume that the illumination across a scene is constant, but this is very often not valid for real

  11. Segmentation and Estimation of Spatially Varying Illumination

    E-print Network

    Robles-Kelly, Antonio

    Segmentation and Estimation of Spatially Varying Illumination Lin Gu, Student Member, IEEE, Cong present an unsupervised method for segmenting the illuminant regions and estimating the illumination power spectrum from a single image of a scene lit by multiple light sources. Here, illuminant region segmentation

  12. Colour Constancy for Scenes with Varying Illumination

    E-print Network

    Funt, Brian

    Colour Constancy for Scenes with Varying Illumination Kobus Barnard1, Graham Finlayson2, and Brian surface reflectance and illumination variation to solve for colour constancy. Most colour constancy algorithms assume that the illumination across a scene is constant, but this is very often not valid for real

  13. Linear Parameter Varying control of a quadrotor

    Microsoft Academic Search

    Samarathunga L. M. D. Rangajeeva; James F. Whidborne

    2011-01-01

    control has been lost [4]. In order to extend the flight envelope a common approach is gain scheduling. In which several linear models of the quadrotor are obtained for different trim points and then number of Liner Time Invariant (LTI) controllers are derived for each point. As operating conditions vary, the global controller is estimated by interpolating gains of the

  14. Venturi Tube with Varying Mass Flow

    NASA Technical Reports Server (NTRS)

    Regenscheit, B.

    1948-01-01

    Measurements on three tubes with flow regulated by suction at the trainling edge of the tube are described. It was possible to vary the mass of air flowing through the tube over a large range. Such tubes could be used for shrouded propellers.

  15. Cosmology with Time-Varying G

    Microsoft Academic Search

    Antonio Alfonso-Faus

    1986-01-01

    It is shown that a Universe with a time-varying gravitational ``constant'' G necessarily implies creation if the rest mass of matter particles m p is constant. In this case, from Einstein's field equations, the conditions for energy-momentum propagation are ? ·( GT mu v ) from which matter and photon propagation equations are derived. Free matter particle propagation is not

  16. ICAPM with time-varying risk aversion

    Microsoft Academic Search

    Paulo Maio

    2007-01-01

    A derivation of the ICAPM in a very general framework and previous theoretical work, argue for the relative risk aversion (RRA) coefficient to be both time-varying and countercyclical. The variables that represent proxies for the cyclical component of RRA are the market dividend yield, default spread, smoothed earnings yield and industrial production growth, all being highly correlated with the business

  17. The pricing of time-varying beta

    Microsoft Academic Search

    Gloria González-Rivera

    1997-01-01

    We generalize an asset pricing model based on the Arbitrage Pricing Theory (APT) allowing beta to be time-varying. Making beta a random variable adds flexibility to the model because permits a non-linear relation between individual returns and the set of factors, and accounts for the effect of possible omitted variables. We integrate the conditional APT with a general linear stochastic

  18. Pt–Co electrocatalyst with varying atomic percentage of transition metal

    Microsoft Academic Search

    Ch. Srinivasa Rao; D. M. Singh; R. Sekhar; J. Rangarajan

    2011-01-01

    A series of Platinum–Cobalt bimetallic catalyst supported on carbon (Vulcan XC-72R) were prepared by sequential deposition using an organic salt of cobalt for use as cathode in Phosphoric Acid Fuel Cell (PAFC). The atomic percent of non noble metal with respect to Pt in the alloy was varied from 5 to 100 and the composition of alloy catalyst was confirmed

  19. Components in time-varying graphs

    NASA Astrophysics Data System (ADS)

    Nicosia, Vincenzo; Tang, John; Musolesi, Mirco; Russo, Giovanni; Mascolo, Cecilia; Latora, Vito

    2012-06-01

    Real complex systems are inherently time-varying. Thanks to new communication systems and novel technologies, today it is possible to produce and analyze social and biological networks with detailed information on the time of occurrence and duration of each link. However, standard graph metrics introduced so far in complex network theory are mainly suited for static graphs, i.e., graphs in which the links do not change over time, or graphs built from time-varying systems by aggregating all the links as if they were concurrent in time. In this paper, we extend the notion of connectedness, and the definitions of node and graph components, to the case of time-varying graphs, which are represented as time-ordered sequences of graphs defined over a fixed set of nodes. We show that the problem of finding strongly connected components in a time-varying graph can be mapped into the problem of discovering the maximal-cliques in an opportunely constructed static graph, which we name the affine graph. It is, therefore, an NP-complete problem. As a practical example, we have performed a temporal component analysis of time-varying graphs constructed from three data sets of human interactions. The results show that taking time into account in the definition of graph components allows to capture important features of real systems. In particular, we observe a large variability in the size of node temporal in- and out-components. This is due to intrinsic fluctuations in the activity patterns of individuals, which cannot be detected by static graph analysis.

  20. Composite hydrogels for implants.

    PubMed

    Ambrosio, L; De Santis, R; Nicolais, L

    1998-01-01

    Hydrophilic composite structures are designed to mimic the transport and mechanical properties of natural soft tissue such as tendons, ligaments and intervertebral discs. Mechanical and viscoelastic behaviour of a soft composite material based on a hydrogel matrix reinforced with bundles of polyethylene therephthalate (PET) fibres is analysed. The typical J-shaped stress-strain behaviour, displayed by natural tendons and ligaments, is reproduced. The mechanical characteristics, such as the extent of the 'toe-in region' and the elastic modulus in the linear region, can be controlled by varying the winding angle of the fibres and the matrix composition. Dynamic mechanical analysis showed the dual behaviour of the composite systems due to the progressive contribution of the PET fibres. Different poly(2-hydroxyethylmethacrylate)/polycaprolactone (PHEMA/PCL) semi-interpenetrating polymer networks (IPNs) hydrogel composite systems reinforced with PET fibres have been investigated for potential use as intervertebral disc prostheses. Compression properties have been evaluated by static and dynamic tests. Uniaxial compression tests on the swollen samples showed an increase of the modulus and maximum stress with increasing content of PCL and PET fibres. Creep behaviour is also dependent on the hydrogel composition. The composite PHEMA/PCL hydrogels showed compression properties similar to those expressed by canine intervertebral discs in different spinal locations. PMID:9612000

  1. Call Title: Nuclear Fission and Radiation Protection Call Identifier: FP7-Fission-2009

    E-print Network

    De Cindio, Fiorella

    small or medium-scale Collaborative Projects Advanced nuclear systems for increased sustainability in sustainable nuclear fission energy Coordination and Support Action (coordinating action) Fission-2.3 FissionCall Title: Nuclear Fission and Radiation Protection · Call Identifier: FP7-Fission-2009 · Date

  2. Converting Call-by-reference to Call-by-value: Fortran and Lisp Richard J. Fateman

    E-print Network

    Fateman, Richard J.

    Converting Call-by-reference to Call-by-value: Fortran and Lisp Coexisting Richard J. Fateman. In particular, if we can find a neat interface, by converting Fortran to Lisp we allow programmers to take primarily addresses concerns of people who wish to use the Fortran and Lisp languages in some synergistic

  3. Call title : FP7-ENV-2010 Call identifier: FP7-ENV-2010

    E-print Network

    Milano-Bicocca, Università

    called: ACTIVITY/ AREA TOPICS CALLED FUNDING SCHEMES ACTIVITY 6.1. CLIMATE CHANGE, POLLUTION AND RISKS pollution and health risks of modern office buildings Collaborative Project (small or medium-scale focused research project) ENV.2010.1.2.2-2 Human health and environmental effects of exposure to pharmaceuticals

  4. Impact of mobility on call block, call drops and optimal cell size in small cell networks

    E-print Network

    Paris-Sud XI, Université de

    1 Impact of mobility on call block, call drops and optimal cell size in small cell networks Avignon, France Abstract We consider small cell networks and study the impact of user mobility. Assuming in small cell networks via some numerical examples. We further discuss the performance of the optimal

  5. Call Numbers Explained 1 8/23/2012 Call Numbers Explained

    E-print Network

    Su, Xiao

    in the library. 6. The King Library is unusual because it is both a public library and a university library numbers. 7. The first is the Dewey Decimal System, which is used to classify public library books. In the library, books are organized by call number. 3. A call number classifies a book by its subject and tells

  6. Composite objects revisited

    Microsoft Academic Search

    Won Kim; Elisa Bertino; Jorge F. Garza

    1989-01-01

    In object-oriented systems, an object may recursively reference any number of other objects. The references, however, do not capture any special relationships between objects. An important semantic relationship which may be superimposed on a reference is the IS-PART-OF relationship between a pair of objects. A set of objects related by the IS-PART-OF relationship is collectively called a composite object.An earlier

  7. Some strength properties of graphite-zirconium carbide composite materials

    Microsoft Academic Search

    V. S. Dergunova; A. N. Shurshakov; G. D. Posos'eva; L. N. Lutsenko

    1972-01-01

    1.Some factors influencing the strength of composite materials were examined.2.A study was made of the strength properties of graphite-zirconium carbide and graphite-zirconium carbide-zirconium composite materials having varying structures and compositions. It was found that, at 2500‡C, the tensile strength of TsG-25 type composite material is 30% higher than that of dense VPP constructional graphite.3.It was established that, by varying the

  8. Belnap's logic and conditional composition

    Microsoft Academic Search

    Alban Ponse; Mark B. van der Zwaag

    2007-01-01

    We study two alternative bases for Belnap's four-valued logic and provide complete equational axiomatizations for them. One is called conditional composition logic. It has a single, ternary if-then-else connective with a sequential, operational reading, and four constants for the truth values. The other logic is called guard logic. The main motivation for this logic lies in its technical properties. It

  9. The evolution of white dwarfs with a varying gravitational constant

    E-print Network

    L. G. Althaus; A. H. Corsico; S. Torres; P. Loren-Aguilar; J. Isern; E. Garcia-Berro

    2011-01-05

    Within the theoretical framework of some modern unification theories the constants of nature are functions of cosmological time. White dwarfs offer the possibility of testing a possible variation of G and, thus, to place constraints to these theories. We present full white dwarf evolutionary calculations in the case that G decreases with time. White dwarf evolution is computed in a self-consistent way, including the most up-to-date physical inputs, non-gray model atmospheres and a detailed core chemical composition that results from the calculation of the full evolution of progenitor stars. We find that the mechanical structure and the energy balance of white dwarfs are strongly modified by the presence of a varying G. In particular, for certain values of the rate of change of G, the evolution of cool white dwarfs is markedly affected. The impact of a varying G is more notorious in the case of more massive white dwarfs. In view of the recent results reporting that a very accurate white dwarf cooling age can be derived for the old and metal-rich open cluster NGC 6791, our study suggests that this cluster could be a potential target to constrain or detect a ypothetical secular variation of G.

  10. Learning Time-Varying Coverage Functions

    PubMed Central

    Du, Nan; Liang, Yingyu; Balcan, Maria-Florina; Song, Le

    2015-01-01

    Coverage functions are an important class of discrete functions that capture the law of diminishing returns arising naturally from applications in social network analysis, machine learning, and algorithmic game theory. In this paper, we propose a new problem of learning time-varying coverage functions, and develop a novel parametrization of these functions using random features. Based on the connection between time-varying coverage functions and counting processes, we also propose an efficient parameter learning algorithm based on likelihood maximization, and provide a sample complexity analysis. We applied our algorithm to the influence function estimation problem in information diffusion in social networks, and show that with few assumptions about the diffusion processes, our algorithm is able to estimate influence significantly more accurately than existing approaches on both synthetic and real world data. PMID:25960624

  11. Force Measurements of a varying camber hydrofoil

    NASA Astrophysics Data System (ADS)

    Najdzin, Derek; Bardet, Philippe M.; Leftwich, Megan C.

    2013-11-01

    The swimming motion of cetaceans (dolphins, whales) is capable of producing large amounts of thrust as observed in nature. This project aims to determine the propulsive efficiency of this swimming motion through force and power measurements. A mechanism was constructed to replicate this motion by applying a combination of pitching and heaving motions to a varying camber hydrofoil. A novel force balance allows the measurement of three direction force and moments as the fin oscillates. A range of Reynolds and Strouhal numbers were tested to identify the most efficient conditions. Allowing the camber of the hydrofoil to vary has shown to increase lift generated, while generating similar thrust forces when compared to a constant camber hydrofoil.

  12. Varying potential silicon carbide gas sensor

    NASA Technical Reports Server (NTRS)

    Shields, Virgil B. (Inventor); Ryan, Margaret A. (Inventor); Williams, Roger M. (Inventor)

    1997-01-01

    A hydrocarbon gas detection device operates by dissociating or electro-chemically oxidizing hydrocarbons adsorbed to a silicon carbide detection layer. Dissociation or oxidation are driven by a varying potential applied to the detection layer. Different hydrocarbon species undergo reaction at different applied potentials so that the device is able to discriminate among various hydrocarbon species. The device can operate at temperatures between 100.degree. C. and at least 650.degree. C., allowing hydrocarbon detection in hot exhaust gases. The dissociation reaction is detected either as a change in a capacitor or, preferably, as a change of current flow through an FET which incorporates the silicon carbide detection layers. The silicon carbide detection layer can be augmented with a pad of catalytic material which provides a signal without an applied potential. Comparisons between the catalytically produced signal and the varying potential produced signal may further help identify the hydrocarbon present.

  13. Call For Native Genius and Indigenous Intellectualism

    E-print Network

    Fixico, Donald L.

    2000-03-01

    . Nonetheless, it can be safely observed that all cultures and communities possess extraordinary "thinking" individuals. The Indigenous People of this earth in the Americas were great thinkers and continue to be, although the mainstream culture does.... Scientific thought permeated American society at the beginning of this next one hundred years. As the United States entered the twentieth century, a popular trend called Progressivism depicted this modernization of America. Theodore Roosevelt championed...

  14. House Calls and the ACGME Competencies

    Microsoft Academic Search

    Jennifer Hayashi; Colleen Christmas

    2009-01-01

    Background: The Accreditation Council for Graduate Medical Education (ACGME) “core competencies” (patient care, medical knowledge, interpersonal and communication skills, practice-based learning, and systems-based practice) are challenging to achieve in today's complex, high-acuity, hospital-based setting. House calls provide unique clinical exposure to opportunities for learning the ACGME competencies in a single integrated experience. We review the medical literature on the educational

  15. Placing Calls with iPhone

    Microsoft Academic Search

    Steve Sande; Erica Sadun

    \\u000a iPhones are versatile devices. They can surf the Web, check the latest stock prices, request a weather report, play thousands\\u000a of games, and map out directions. But at its core, the iPhone remains a cell phone, which means that making phone calls is\\u000a its primary function. In this chapter, you’ll learn the essential things you need to know to place

  16. VSS observer for linear time varying system

    Microsoft Academic Search

    Hideki Hashimoto; V. I. Utkin; J.-X. Xu; H. Suzuki; F. Harashima

    1990-01-01

    The problem of designing an observer for state estimation using variable structure system (VSS) theory is discussed. The theory and design principles for linear time-varying systems are presented. The observer is constructed by introducing a block-observable from which is similar to a lower triangular matrix. The convergence of the observer is guaranteed by a sliding mode with first-order filter. Simulation

  17. Biorthogonal frequency-varying modulated lapped transform

    Microsoft Academic Search

    Yixin Gao; Guizhong Liu

    2009-01-01

    In this paper we introduce a biorthogonal frequency-varying modulated lapped transform (BFV-MLT) with flexible tiling behavior of time-frequency plane and attenuation of ringing artifacts. Biorthogonality allows accessorial freedom in designing the analysis and synthesis filter-banks and FVMLT provides nonuniform decomposition of signals with ideal time or frequency resolutions. By constructing a new approach to FV-MLT, we incorporate biorthogonality into FV-MLT

  18. Cosmology with time-varying G

    Microsoft Academic Search

    Antonio Alfonso-Faus

    1986-01-01

    It is shown that a Universe with a time-varying gravitational “constant”G necessarily implies creation if the rest mass of matter particlesmp is constant. In this case, from Einstein's field equations, the conditions for energy-momentum propagation are ? ·(GTµv) from which matter and photon propagation equations are derived. Free matter particle propagation is not affected by creation that is given byGNpmp=const,

  19. Call progress time measurement in IP telephony

    NASA Astrophysics Data System (ADS)

    Khasnabish, Bhumip

    1999-11-01

    Usually a voice call is established through multiple stages in IP telephony. In the first stage, a phone number is dialed to reach a near-end or call-originating IP-telephony gateway. The next stages involve user identification through delivering an m-digit user-id to the authentication and/or billing server, and then user authentication by using an n- digit PIN. After that, the caller is allowed (last stage dial tone is provided) to dial a destination phone number provided that authentication is successful. In this paper, we present a very flexible method for measuring call progress time in IP telephony. The proposed technique can be used to measure the system response time at every stage. It is flexible, so that it can be easily modified to include new `tone' or a set of tones, or `voice begin' can be used in every stage to detect the system's response. The proposed method has been implemented using scripts written in Hammer visual basic language for testing with a few commercially available IP telephony gateways.

  20. Modeling of cryogen leakage through composite laminates 

    E-print Network

    Peddiraju, Naga Venkata Satya Pravin Kumar

    2005-02-17

    with anisotropy of the composite and mismatch in the thermal and mechanical properties of ?bers and matrix lead to transverse matrix cracks (TMC) in each ply. TMC in adjacent plies intersect in localized regions at ply interfaces called crack junctions...

  1. Calculators to Motivate Infinite Composition of Functions.

    ERIC Educational Resources Information Center

    McCune, E. D.; And Others

    1980-01-01

    This paper demonstrates how calculators may be used to motivate a concept called infinite composition of functions. Several mathematical topics, such as continued square roots, continued fractions, and infinite products are treated and discussed as special cases. (Author/MK)

  2. Neural correlates of threat perception: neural equivalence of conspecific and heterospecific mobbing calls is learned.

    PubMed

    Avey, Marc T; Hoeschele, Marisa; Moscicki, Michele K; Bloomfield, Laurie L; Sturdy, Christopher B

    2011-01-01

    Songbird auditory areas (i.e., CMM and NCM) are preferentially activated to playback of conspecific vocalizations relative to heterospecific and arbitrary noise. Here, we asked if the neural response to auditory stimulation is not simply preferential for conspecific vocalizations but also for the information conveyed by the vocalization. Black-capped chickadees use their chick-a-dee mobbing call to recruit conspecifics and other avian species to mob perched predators. Mobbing calls produced in response to smaller, higher-threat predators contain more "D" notes compared to those produced in response to larger, lower-threat predators and thus convey the degree of threat of predators. We specifically asked whether the neural response varies with the degree of threat conveyed by the mobbing calls of chickadees and whether the neural response is the same for actual predator calls that correspond to the degree of threat of the chickadee mobbing calls. Our results demonstrate that, as degree of threat increases in conspecific chickadee mobbing calls, there is a corresponding increase in immediate early gene (IEG) expression in telencephalic auditory areas. We also demonstrate that as the degree of threat increases for the heterospecific predator, there is a corresponding increase in IEG expression in the auditory areas. Furthermore, there was no significant difference in the amount IEG expression between conspecific mobbing calls or heterospecific predator calls that were the same degree of threat. In a second experiment, using hand-reared chickadees without predator experience, we found more IEG expression in response to mobbing calls than corresponding predator calls, indicating that degree of threat is learned. Our results demonstrate that degree of threat corresponds to neural activity in the auditory areas and that threat can be conveyed by different species signals and that these signals must be learned. PMID:21909363

  3. Neural Correlates of Threat Perception: Neural Equivalence of Conspecific and Heterospecific Mobbing Calls Is Learned

    PubMed Central

    Avey, Marc T.; Hoeschele, Marisa; Moscicki, Michele K.; Bloomfield, Laurie L.; Sturdy, Christopher B.

    2011-01-01

    Songbird auditory areas (i.e., CMM and NCM) are preferentially activated to playback of conspecific vocalizations relative to heterospecific and arbitrary noise [1]–[2]. Here, we asked if the neural response to auditory stimulation is not simply preferential for conspecific vocalizations but also for the information conveyed by the vocalization. Black-capped chickadees use their chick-a-dee mobbing call to recruit conspecifics and other avian species to mob perched predators [3]. Mobbing calls produced in response to smaller, higher-threat predators contain more “D” notes compared to those produced in response to larger, lower-threat predators and thus convey the degree of threat of predators [4]. We specifically asked whether the neural response varies with the degree of threat conveyed by the mobbing calls of chickadees and whether the neural response is the same for actual predator calls that correspond to the degree of threat of the chickadee mobbing calls. Our results demonstrate that, as degree of threat increases in conspecific chickadee mobbing calls, there is a corresponding increase in immediate early gene (IEG) expression in telencephalic auditory areas. We also demonstrate that as the degree of threat increases for the heterospecific predator, there is a corresponding increase in IEG expression in the auditory areas. Furthermore, there was no significant difference in the amount IEG expression between conspecific mobbing calls or heterospecific predator calls that were the same degree of threat. In a second experiment, using hand-reared chickadees without predator experience, we found more IEG expression in response to mobbing calls than corresponding predator calls, indicating that degree of threat is learned. Our results demonstrate that degree of threat corresponds to neural activity in the auditory areas and that threat can be conveyed by different species signals and that these signals must be learned. PMID:21909363

  4. Telephone triage of cardiac emergency calls by dispatchers: a prospective study of 1386 emergency calls.

    PubMed Central

    Srámek, M.; Post, W.; Koster, R. W.

    1994-01-01

    OBJECTIVES--To evaluate the handling of potential cardiac emergency calls by dispatchers, to determine their final diagnosis and urgency, and to determine the value of the main complaint in predicting urgency and the ability of the dispatchers to recognise non-urgent conditions. DESIGN--Prospective data collection and recording of main complaint of emergency calls placed via the 06-11 alarm telephone number with follow up to hospital when the patients were transported and the general practitioner when they were not. SETTING--Dispatch centres of the emergency medical services in Amsterdam (urban area) and Enschede (rural area). PATIENTS--1386 consecutive adult subjects of emergency calls placed by citizens about chest problems or unconsciousness not caused by injury. MAIN OUTCOME MEASURES--Frequency of characteristics of the calls, outcome in diagnosis, and assessment of urgency. RESULTS--69 (5%) patients were dead when the ambulance arrived. Diagnosis was established in 1071 patients (77%). The disorders most often reported were cardiac, with acute ischaemia in 15% of all subjects. In 28% of cases and for each presenting complaint no organic explanation was found. Overall 39% of all emergency calls were urgent; the urgency rate was lowest for calls for people with abdominal discomfort. Dispatchers correctly identified 90% of the non-urgent calls, but 55% of the calls that they identified as urgent proved to be non-urgent. CONCLUSION--Currently, direct dialling for an ambulance without the intervention of a general practitioner imposes a high work load on emergency systems and hospitals because triage by dispatchers is not sufficiently accurate. It may be possible to increase the accuracy of triage by developing and testing decision algorithms. PMID:8011407

  5. Calling patterns in human communication dynamics.

    PubMed

    Jiang, Zhi-Qiang; Xie, Wen-Jie; Li, Ming-Xia; Podobnik, Boris; Zhou, Wei-Xing; Stanley, H Eugene

    2013-01-29

    Modern technologies not only provide a variety of communication modes (e.g., texting, cell phone conversation, and online instant messaging), but also detailed electronic traces of these communications between individuals. These electronic traces indicate that the interactions occur in temporal bursts. Here, we study intercall duration of communications of the 100,000 most active cell phone users of a Chinese mobile phone operator. We confirm that the intercall durations follow a power-law distribution with an exponential cutoff at the population level but find differences when focusing on individual users. We apply statistical tests at the individual level and find that the intercall durations follow a power-law distribution for only 3,460 individuals (3.46%). The intercall durations for the majority (73.34%) follow a Weibull distribution. We quantify individual users using three measures: out-degree, percentage of outgoing calls, and communication diversity. We find that the cell phone users with a power-law duration distribution fall into three anomalous clusters: robot-based callers, telecom fraud, and telephone sales. This information is of interest to both academics and practitioners, mobile telecom operators in particular. In contrast, the individual users with a Weibull duration distribution form the fourth cluster of ordinary cell phone users. We also discover more information about the calling patterns of these four clusters (e.g., the probability that a user will call the c(r)-th most contact and the probability distribution of burst sizes). Our findings may enable a more detailed analysis of the huge body of data contained in the logs of massive users. PMID:23319645

  6. Inhibitors of calling behavior of Plodia interpunctella

    PubMed Central

    Hirashima, Akinori; Shigeta, Yoko; Eiraku, Tomohiko; Kuwano, Eiichi

    2003-01-01

    Some octopamine agonists were found to suppress the calling behavior of the stored product Indian meal moth, Plodia interpunctella. Compounds were screened using a calling behavior bioassay using female P. interpunctella. Four active derivatives, with inhibitory activity at the nanomolar range, were identified in order of decreasing activity: 2-(1-phenylethylamino)-2-oxazoline > 2-(2-ethyl,6-methylanilino)oxazolidine > 2-(2-methyl benzylamino)-2-thiazoline > 2-(2,6-diethylanilino)thiazolidine. Three-dimensional pharmacophore hypotheses were built from a set of 15 compounds. Among the ten common-featured models generated by the program Catalyst/HipHop, a hypothesis including a hydrogen-bond acceptor lipid, a hydrophobic aromatic and two hydrophobic aliphatic features was considered to be essential for inhibitory activity in the calling behavior. Active compounds mapped well onto all the hydrogen-bond acceptor lipid, hydrophobic aromatic and hydrophobic aliphatic features of the hypothesis. On the other hand, less active compounds were shown not to achieve the energetically favorable conformation that is found in the active molecules in order to fit the 3D common-feature pharmacophore models. The present studies demonstrate that inhibition of calling behavior is via an octopamine receptor. Abbreviation: AII 2-(arylimino)imidazolidine AIO 2-(arylimino)oxazolidine AIT 2-(arylimino)thiazolidine CBO 2-(4-chlorobenzylamino)-2-(4-phenyl)oxazoline CDM chlordimeform Confs number of conformers DIP 2-(2,6-diethylphenylimino)piperidine Features/Confs total number of features divided by the number of conformers (summed over the entire family of conformers) HBA hydrogen-bond acceptor HBAl hydrogen-bond acceptor lipid HBD hydrogen-bond donor Hp hydrophobic HpAl hydrophobic aliphatic HpAr hydrophobic aromatic mp melting point MTO 2-(3-methyl benzylthio)-2-oxazoline NI negative ionizable NIO 2-(1-naphthylimino)oxazolidine OA octopamine ODA 2-phenyl-5,6-dihydro-4H-1,3,4-oxadiazine ODO 2-phenyl-5,6-dihydro-4H-1,3,4-oxadiazine-5(6H)-one PBAN pheromone biosynthesis activating neuropeptide PEO 2-(1-phenylethylamino)-2-oxazoline PI positive ionizable PIT 1-(2,6-dimethylphenyl)imidazolidine-2-thione RA ring aromatic SBO 2-(substituted benzylamino)-2-oxazoline SBT 2-(substituted benzylamino)-2-thiazoline STO 2-(substituted benzylthio)-2-oxazoline ZETA (Z,E)-9,12-tetradecadienyl acetate PMID:15841221

  7. Linear Parameter Varying Control for Actuator Failure

    NASA Technical Reports Server (NTRS)

    Shin, Jong-Yeob; Wu, N. Eva; Belcastro, Christine; Bushnell, Dennis M. (Technical Monitor)

    2002-01-01

    A robust linear parameter varying (LPV) control synthesis is carried out for an HiMAT vehicle subject to loss of control effectiveness. The scheduling parameter is selected to be a function of the estimates of the control effectiveness factors. The estimates are provided on-line by a two-stage Kalman estimator. The inherent conservatism of the LPV design is reducing through the use of a scaling factor on the uncertainty block that represents the estimation errors of the effectiveness factors. Simulations of the controlled system with the on-line estimator show that a superior fault-tolerance can be achieved.

  8. Call Admission Control in OFDM Wireless Multimedia Networks

    Microsoft Academic Search

    Yan Zhang

    2008-01-01

    Call admission control is an effective mechanism to guarantee robust services in wireless networks. In this paper, we present several call admission control algorithms and queueing models for the subcarrier allocation in the OFDM-based wireless multimedia networks. Call connection requests are differentiated into narrow-band call and wide-band call. For either class of calls, the traffic process is characterized as batch

  9. OBSERVATIONS ON THE CALLS OP THE GRASSHOPPER MOUSE {ONYCHOMYS LEUCOGASTERY

    Microsoft Academic Search

    DAVID G. RUFFER

    Calls of grasshopper mice include squeaks, chirping, a single high-pitched call, and a two-phase high-pitched call. The latter two are a means of intraspecific localization and are not a hunting call as previously supposed. A variable range of postures are assumed during the calls. Several authors have noted the calls of grasshopper mice (Genus Onychomys), and anyone who has kept

  10. The Most General Time-Varying Filter Bank and Time-Varying Lapped Transforms

    Microsoft Academic Search

    Guangyu Wang

    2006-01-01

    In this paper, a model-based method is used to analyze the most general time-varying filter bank, where all parameters in the filter bank change with time, including filter length, decimator factor, and the number of channel. Through modeling the time-varying filter bank at a fixed time point as a time-invariant filter bank, we change the study of the most general

  11. North Pacific right whale up-call source levels and propagation distance on the southeastern Bering Sea shelf.

    PubMed

    Munger, Lisa M; Wiggins, Sean M; Hildebrand, John A

    2011-06-01

    Call source levels, transmission loss, and ambient noise levels were estimated for North Pacific right whale (Eubalaena japonica) up-calls recorded in the southeastern Bering Sea in autumn of 2000 and 2001. Distances to calling animals, needed to estimate source levels, were based on two independent techniques: (1) arrival-time differences on three or more hydrophones and (2) shallow-water dispersion of normal modes on a single receiver. Average root-mean-square (rms) call source levels estimated by the two techniques were 178 and 176 dB re 1 ?Pa at 1 m, respectively, over the up-call frequency band, which was determined per call and averaged 90 to 170 Hz. Peak-to-peak source levels were 14 to 22 dB greater than rms levels. Transmission loss was approximately 15?log(10)(range), intermediate between cylindrical and spherical spreading. Ambient ocean noise within the up-call band varied from 72 to 91 dB re 1 ?Pa(2)/Hz. Under average noise conditions, call spectrograms were detectable for whales at distances up to 100 km, but propagation and detection distance may vary depending on environmental parameters and anthropogenic noise. Obtaining distances to animals and acoustic detection range is a step toward using long-term passive acoustic recordings to estimate abundance for this critically endangered whale population. PMID:21682425

  12. Stereoscopic depth perception varies with hues

    NASA Astrophysics Data System (ADS)

    Chen, Zaiqing; Shi, Junsheng; Tai, Yonghang; Yun, Lijun

    2012-09-01

    The contribution of color information to stereopsis is controversial, and whether the stereoscopic depth perception varies with chromaticity is ambiguous. This study examined the changes in depth perception caused by hue variations. Based on the fact that a greater disparity range indicates more efficient stereoscopic perception, the effect of hue variations on depth perception was evaluated through the disparity range with random-dot stereogram stimuli. The disparity range was obtained by constant-stimulus method for eight chromaticity points sampled from the CIE 1931 chromaticity diagram. Eight sample points include four main color hues: red, yellow, green, and blue at two levels of chroma. The results show that the disparity range for the yellow hue is greater than the red hue, the latter being greater than the blue hue and the disparity range for green hue is smallest. We conclude that the perceived depth is not the same for different hues for a given size of disparity. We suggest that the stereoscopic depth perception can vary with chromaticity.

  13. MULTIVARIATE VARYING COEFFICIENT MODEL FOR FUNCTIONAL RESPONSES

    PubMed Central

    Zhu, Hongtu; Li, Runze; Kong, Linglong

    2012-01-01

    Motivated by recent work studying massive imaging data in the neuroimaging literature, we propose multivariate varying coefficient models (MVCM) for modeling the relation between multiple functional responses and a set of covariates. We develop several statistical inference procedures for MVCM and systematically study their theoretical properties. We first establish the weak convergence of the local linear estimate of coefficient functions, as well as its asymptotic bias and variance, and then we derive asymptotic bias and mean integrated squared error of smoothed individual functions and their uniform convergence rate. We establish the uniform convergence rate of the estimated covariance function of the individual functions and its associated eigenvalue and eigenfunctions. We propose a global test for linear hypotheses of varying coefficient functions, and derive its asymptotic distribution under the null hypothesis. We also propose a simultaneous confidence band for each individual effect curve. We conduct Monte Carlo simulation to examine the finite-sample performance of the proposed procedures. We apply MVCM to investigate the development of white matter diffusivities along the genu tract of the corpus callosum in a clinical study of neurodevelopment. PMID:23645942

  14. Varying execution discipline to increase performance

    SciTech Connect

    Campbell, P.L.; Maccabe, A.B.

    1993-12-22

    This research investigates the relationship between execution discipline and performance. The hypothesis has two parts: 1. Different execution disciplines exhibit different performance for different computations, and 2. These differences can be effectively predicted by heuristics. A machine model is developed that can vary its execution discipline. That is, the model can execute a given program using either the control-driven, data-driven or demand-driven execution discipline. This model is referred to as a ``variable-execution-discipline`` machine. The instruction set for the model is the Program Dependence Web (PDW). The first part of the hypothesis will be tested by simulating the execution of the machine model on a suite of computations, based on the Livermore Fortran Kernel (LFK) Test (a.k.a. the Livermore Loops), using all three execution disciplines. Heuristics are developed to predict relative performance. These heuristics predict (a) the execution time under each discipline for one iteration of each loop and (b) the number of iterations taken by that loop; then the heuristics use those predictions to develop a prediction for the execution of the entire loop. Similar calculations are performed for branch statements. The second part of the hypothesis will be tested by comparing the results of the simulated execution with the predictions produced by the heuristics. If the hypothesis is supported, then the door is open for the development of machines that can vary execution discipline to increase performance.

  15. Apoptosis: Calling Time on Apoptosome Activity

    NSDL National Science Digital Library

    Colin Adrain (Cambridge; Medical Research Council Laboratory of Molecular Biology REV)

    2009-10-06

    Apoptosis is a controlled form of cellular demolition, catalyzed by a family of cysteine proteases called caspases. In response to diverse proapoptotic stimuli, caspase-9 is recruited and activated within an oligomeric complex called the apoptosome. The apoptosome drives autocatalytic processing of caspase-9, triggering a proteolytic caspase cascade that results in the biochemical and morphological changes characteristic of cell death. It is unclear why caspase-9 undergoes autocatalytic processing following apoptosome recruitment, because interdomain processing is dispensable for caspase-9 activity. A study has shed light on this issue by demonstrating that caspase-9 processing within the apoptosome promotes its displacement from the complex, leading to inactivation of this protease. Thus, autoprocessing of caspase-9 within the apoptosome serves as a “molecular timer” that limits the proteolytic activity of this complex through displacement of bound caspase-9 molecules. This timer mechanism may enable cells to prevent low amounts of apoptosome activation from spiraling out of control unless sufficient numbers of apoptosomes are assembled within a particular time window, which would drive full-blown caspase activation and apoptosis.

  16. KRLMM: an adaptive genotype calling method for common and low frequency variants

    PubMed Central

    2014-01-01

    Background SNP genotyping microarrays have revolutionized the study of complex disease. The current range of commercially available genotyping products contain extensive catalogues of low frequency and rare variants. Existing SNP calling algorithms have difficulty dealing with these low frequency variants, as the underlying models rely on each genotype having a reasonable number of observations to ensure accurate clustering. Results Here we develop KRLMM, a new method for converting raw intensities into genotype calls that aims to overcome this issue. Our method is unique in that it applies careful between sample normalization and allows a variable number of clusters k (1, 2 or 3) for each SNP, where k is predicted using the available data. We compare our method to four genotyping algorithms (GenCall, GenoSNP, Illuminus and OptiCall) on several Illumina data sets that include samples from the HapMap project where the true genotypes are known in advance. All methods were found to have high overall accuracy (> 98%), with KRLMM consistently amongst the best. At low minor allele frequency, the KRLMM, OptiCall and GenoSNP algorithms were observed to be consistently more accurate than GenCall and Illuminus on our test data. Conclusions Methods that tailor their approach to calling low frequency variants by either varying the number of clusters (KRLMM) or using information from other SNPs (OptiCall and GenoSNP) offer improved accuracy over methods that do not (GenCall and Illuminus). The KRLMM algorithm is implemented in the open-source crlmm package distributed via the Bioconductor project (http://www.bioconductor.org). PMID:24886250

  17. On the Bohl and general exponents of the discrete time-varying linear system

    NASA Astrophysics Data System (ADS)

    Niezabitowski, Micha?

    2014-12-01

    Many properties of dynamical systems may be characterized by certain numbers called characteristic exponents. The most important are: Lyapunov, Bohl and general exponents. In this paper we investigate relations between certain subtypes of the general exponents of discrete time-varying linear systems, namely the senior lower and the junior upper once. The main contribution of the paper is to construct an example of a system with the senior lower exponent strictly smaller than the junior upper general exponents.

  18. Thermalbehaviour of gypsum based composites

    Microsoft Academic Search

    B. Zdravkov; Y. Pelovski

    2007-01-01

    DTA\\/TG\\u000a and X-ray investigations were carried out on different building composites\\u000a in order to examine their relative hydration processes. The presence of lime,\\u000a hemihydrate gypsum, ferosilicate, and some other wastes as leaner and hydrophobic\\u000a additive in different proportions into composites provokes hydration reactions,\\u000a leading to calcium silicate hydrate (CSH), ettringite and an intermediate\\u000a phase formation with varying chemical composition of

  19. Asphaltic compositions

    SciTech Connect

    Wright, W.E.; Zaweski, E.F.

    1987-02-24

    This patent describes an asphaltic composition of enhanced utility for vehicular pavement which composition comprises a road paving grade of asphalt in admixture with at least one alkylene dithiocarbamate. The composition is characterized by having a reduced increase in absolute viscosity to original absolute viscosity after thin film aging as measured by ASTM Test D 1754 at 140/sup 0/F.

  20. A model for composite system design

    Microsoft Academic Search

    E. Doerry; S. Fickas; R. Helm; M. Feather

    1991-01-01

    Composite systems are systems that encompass multiple agents involved in ongoing, interactive activities. The authors study requirements acquisition, specification and design of such systems. The research objective is a model that encompasses this entire design activity, and thereafter, techniques and tools called for by the model, which will serve to provide automated assistance to a skilled designer of composite systems.

  1. Periodic structures with time-varying loads

    NASA Technical Reports Server (NTRS)

    Epp, Larry W.; Chan, Chi H.; Mittra, Raj

    1992-01-01

    A new method is described for generating and predicting the power scattered at multiple frequencies from a periodic array excited by a monochromatic incident plane wave. The scattered power is predicted by developing an equivalent circuit representation from the exact method of moment solution of the unloaded periodic problem and then employing a modified method of moments approach to predict the scattered fields due to time-varying loads. An advantage of this method is that the generality of the equivalent circuit can be exploited to study the effects of different loads on the power scattered in the harmonic frequencies with a minimal amount of effort. The method can also be applied to multiple incident frequencies.

  2. Inference of temporally varying Bayesian Networks

    PubMed Central

    Thorne, Thomas; Stumpf, Michael P. H.

    2012-01-01

    Motivation: When analysing gene expression time series data, an often overlooked but crucial aspect of the model is that the regulatory network structure may change over time. Although some approaches have addressed this problem previously in the literature, many are not well suited to the sequential nature of the data. Results: Here, we present a method that allows us to infer regulatory network structures that may vary between time points, using a set of hidden states that describe the network structure at a given time point. To model the distribution of the hidden states, we have applied the Hierarchical Dirichlet Process Hidden Markov Model, a non-parametric extension of the traditional Hidden Markov Model, which does not require us to fix the number of hidden states in advance. We apply our method to existing microarray expression data as well as demonstrating is efficacy on simulated test data. Contact: thomas.thorne@imperial.ac.uk PMID:23074260

  3. WKB approximation for abruptly varying potential wells

    NASA Astrophysics Data System (ADS)

    Amthong, Attapon

    2014-11-01

    We present an approach to obtain eigenfunctions and eigenenergies for abruptly varying potentials in the framework of the Wentzel-Kramers-Brillouin (WKB) approximation. To illustrate it, two examples of the potentials are studied. The first one is the combination of a step barrier and a harmonic oscillator potential, and the second one consists of a step barrier and a linear potential. The formulation of a WKB quantization rule is proposed. Our approach shows that WKB energies and those from numerical calculation are in good agreement. According to matching conditions used, WKB wavefunctions in this present work are violated at only one classical turning point, but they behave well at another point where the potentials are discontinuous.

  4. Time varying arctic climate change amplification

    SciTech Connect

    Chylek, Petr [Los Alamos National Laboratory; Dubey, Manvendra K [Los Alamos National Laboratory; Lesins, Glen [DALLHOUSIE U; Wang, Muyin [NOAA/JISAO

    2009-01-01

    During the past 130 years the global mean surface air temperature has risen by about 0.75 K. Due to feedbacks -- including the snow/ice albedo feedback -- the warming in the Arctic is expected to proceed at a faster rate than the global average. Climate model simulations suggest that this Arctic amplification produces warming that is two to three times larger than the global mean. Understanding the Arctic amplification is essential for projections of future Arctic climate including sea ice extent and melting of the Greenland ice sheet. We use the temperature records from the Arctic stations to show that (a) the Arctic amplification is larger at latitudes above 700 N compared to those within 64-70oN belt, and that, surprisingly; (b) the ratio of the Arctic to global rate of temperature change is not constant but varies on the decadal timescale. This time dependence will affect future projections of climate changes in the Arctic.

  5. Failure models for textile composites

    NASA Technical Reports Server (NTRS)

    Cox, Brian

    1995-01-01

    The goals of this investigation were to: (1) identify mechanisms of failure and determine how the architecture of reinforcing fibers in 3D woven composites controlled stiffness, strength, strain to failure, work of fracture, notch sensitivity, and fatigue life; and (2) to model composite stiffness, strength, and fatigue life. A total of 11 different angle and orthogonal interlock woven composites were examined. Composite properties depended on the weave architecture, the tow size, and the spatial distributions and strength of geometrical flaws. Simple models were developed for elastic properties, strength, and fatigue life. A more complicated stochastic model, called the 'Binary Model,' was developed for damage tolerance and ultimate failure. These 3D woven composites possessed an extraordinary combination of strength, damage tolerance, and notch insensitivity.

  6. Another call to increase STEM education

    NASA Astrophysics Data System (ADS)

    Showstack, Randy

    2011-07-01

    As science, technology, engineering, and mathematics (STEM) education becomes increasingly important, U.S. students are lagging behind other nations on international assessments, according to a recent Trends in International Mathematics and Science study. A 22 June report from the U.S. National Research Council (NRC) calls for increasing the focus on STEM education in the United States. “To make progress in improving STEM education for all students, policy makers at the national, state, and local levels should elevate science to the same level of importance as reading and mathematics,” states the report, “Successful K-12 STEM Education: Identifying Effective Approaches in Science, Technology, Engineering, and Mathematics.” It outlines several goals: expand the number of students who pursue advanced degrees and careers in STEM fields; expand the STEM-capable workforce, while also broadening the participation of women and minorities; and increase STEM literacy for all students, whether or not they pursue STEM-related careers or additional study in those areas.

  7. Revised energy tax called less harsh

    SciTech Connect

    Begley, R.

    1993-06-23

    Following the Senate`s refusal to consider a Btu tax, manufacturing interests are greeting the revised transportation fuels tax proposal with notably less rancor than they did its more sweeping predecessor. Far from the fierce opposition expressed to the broadbased Btu tax, industry groups are staking out a position of {open_quotes}no position{close_quotes} on the fuels tax. The Chemical Manufacturers Association (CMA; Washington) sent a letter to all 100 senators calling the proposed fuels tax-still being negotiated at CW`s press time-the least harmful of the energy tax ideas that have been discussed but stopping short of an endorsement, says CMA`s Bob Hill, assistant director/taxation.

  8. So-called Spontaneous Human Combustion.

    PubMed

    Levi-Faict, Thierry W; Quatrehomme, Gérald

    2011-09-01

    A well-documented case of so-called Spontaneous Human Combustion is reported. Review of the literature shows that these strange observations have been reported since the 17th century, even in famous novels. There are several main features that may lead to help the diagnosis: the vicinity of the body is intact or nearly intact, some parts of the body are turned into ashes (usually the middle third of the body), whereas other parts are intact or nearly intact, burning of the body usually occurs postmortem, the cause of death is usually natural, there is often (but not always) high concentrations of blood alcohol, there is a source of heat near the body. It is indispensable to rule out a homicide by the examination of the body in situ, the autopsy, the toxicological and histopathological samples, the arson assessment, and a thorough police inquiry. PMID:21392004

  9. Fundamental Investigation of Circumferentially Varying Stator Cascades

    NASA Astrophysics Data System (ADS)

    Farnsworth, John A. N.

    2011-12-01

    The fundamentals of circumferentially varying stator cascades and their interactions with a downstream fixed pitch propeller were investigated experimentally utilizing multiple measurement techniques. The flow physics associated with the isolated circumferentially varying, or cyclic, stator cascade was studied in a wind tunnel environment through string tuft flow visualization, 2-D PIV, Stereoscopic PIV, and static surface pressure measurements. The coupled wake physics of the cyclic stator cascade with propeller were then investigated in a water tunnel using Stereo PIV. Finally, the global performance of components and the coupled system were quantified through force and moment measurements on the model in the water tunnel. A cyclic distribution of the stators' deflections resulted in non-axisymmetric distributions of the surface pressure and the flow field downstream of the stator array. In the model near wake the flow field is associated with secondary flow patterns in the form of coherent streamwise vortical structures that can be described by potential flow mechanisms. The collective pitch distribution of the stators produces a flow field that resembles a potential Rankine vortex, whereas the cyclic pitch distribution generates a flow pattern that can be described by a potential vortex pair in a cross flow. The stator distribution alone produces a significant side force that increases linearly with stator pitch amplitude. When a propeller is incorporated downstream from the cyclic cascade the side force from the stator cascade is reduced, but a small vertical force and pitching moment are created. The generation of these secondary forces and moments can be related to the redistribution of the tangential flow from the cyclic cascade into the axial direction by the retreating and advancing blade states of the fixed pitch propeller.

  10. Historical Gasoline Composition Data 1976 - 2010

    EPA Science Inventory

    Gasoline composition varies for technical, market and regulatory reasons. Knowledge of any one of these is insufficient for understanding the chemical composition of gasoline at any specific location in the U.S. Historical data collected by the National Institute of Petroleum ...

  11. Physical Properties of Polyolefin \\/ Bamboo Charcoal Composites

    Microsoft Academic Search

    Siriwan KITTINAOVARAT; Worawat SUTHAMNOI

    The physical properties of two kinds of polyolefin \\/ bamboo charcoal composites, based upon polypropylene (PP) and low density polyethylene (LDPE), were studied for varying levels of charcoal inclusion between 0 and 20 phr. A Brabender mixer and two-roll mill were used for the mixing process of both polyolefin and bamboo charcoal composites, followed by compression moulding of the homogeneous

  12. A framework for large scalable natural language call routing systems

    Microsoft Academic Search

    Cheng Wu; David Lubensky; Juan Huerta; Xiang Li; Hong-Kwang Jeff Kuo

    2003-01-01

    A framework is proposed for enterprise automated call routing system development and large scalable natural language call routing application deployment based on IBM's speech recognition and NLU application engagement practices in recently years. To facilitate employing different call classification algorithms in an easy integration manner, this framework architecture provides a plug & play environment for evaluating promising call routing algorithms

  13. Integration of pricing with call admission control for wireless networks

    Microsoft Academic Search

    Jiongkuan Hou; Jie Yang; Symeon Papavassiliou

    2001-01-01

    Traditional call admission control (CAC) schemes that mainly focus on the trade off between new call blocking probability and handoff call blocking probability can not solve the problem of congestion in wireless networks. We investigate the role of pricing as an additional dimension of the call admission control process in order to efficiently and effectively control the use of wireless

  14. Insensitive Call Admission Control for Wireless Multiservice Networks

    Microsoft Academic Search

    Jorge Martinez-Bauset; Vicent Pla; Elena Bernal-Mor

    2011-01-01

    WO important quality of service measures for wireless networks are the fraction of new and handover calls that are blocked due to the lack of enough free resources. As handover blocking is more annoying than new call blocking for subscribers, efficient call admission control (CAC) strategies can be used to reject new calls in order to reserve resources for future

  15. Fairness optimization of thinning Call Admission Control in wireless networks

    Microsoft Academic Search

    Georgios I. Tsiropoulos; Dimitrios G. Stratogiannis; John D. Kanellopoulos; Panayotis G. Cottis

    2009-01-01

    Resource reservation call admission control (CAC) schemes constitute an efficient solution for prioritizing high priority calls. Issues concerning fairness among calls arise during the implementation of CAC. In this paper, a new optimization model selecting the admission probability in thinning schemes is proposed to provide fairness in resource sharing among different input call stream flows. The existence of an optimal

  16. Optimal Call Admission Control Policy In Wireless Networks

    Microsoft Academic Search

    Wenlong Ni; Wei Li; Mansoor Alam

    2008-01-01

    It is well known that the call admission policy has a big impact on the performance of a wireless network. Due to the nonlinear dependence between new calls and handoff calls, it becomes quite difficult to exactly model a wireless network. In this paper, we take all the incoming calls to a single cell of a wireless network as one

  17. Call Admission Control in Mobile Cellular Networks: A Comprehensive Survey

    E-print Network

    Boutaba, Raouf

    Call Admission Control in Mobile Cellular Networks: A Comprehensive Survey Majid Ghaderi and Raouf of call admission control for future cellular networks. #12;1 Call Admission Control in Mobile Cellular 5412 Fax: +519 885 1208 {mghaderi,rboutaba}@uwaterloo.ca Abstract Call admission control is a key

  18. A More Realistic Thinning Scheme for Call Admission Control in

    E-print Network

    Pan, Yi

    A More Realistic Thinning Scheme for Call Admission Control in Multimedia Wireless Networks Xian control scheme named thinning scheme, which smoothly throttles the admission rates of calls according, analytical formulas for call blocking probabilities are derived. Index Terms--Call admission control (CAC

  19. Simulation Evaluation of Call Dropping Policies for Stochastic Capacity Networks

    E-print Network

    Williamson, Carey

    , Simula- tion, Call Blocking, Call Dropping, Wireless CDMA 1 Introduction In many network environments Mode (ATM) networks use Connection Ad- mission Control (CAC) to determine which calls are allowedSimulation Evaluation of Call Dropping Policies for Stochastic Capacity Networks Hongxia Sun Carey

  20. 29 CFR 778.221 - “Call-back” pay.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...for Hours Worked § 778.221 “Call-back” pay. (a) General. In the interest...with respect to typical minimum “call-back” or “call-out” payments...application of these principles to call-back payments may be illustrated as...

  1. In situ source levels of mulloway (Argyrosomus japonicus) calls.

    PubMed

    Parsons, Miles J G; McCauley, Robert D; Mackie, Michael C; Siwabessy, Paulus J; Duncan, Alec J

    2012-11-01

    Mulloway (Argyrosomus japonicus) in Mosman Bay, Western Australia produce three call categories associated with spawning behavior. The determination of call source levels and their contribution to overall recorded sound pressure levels is a significant step towards estimating numbers of calling fish within the detection range of a hydrophone. The source levels and ambient noise also provide significant information on the impacts anthropogenic activity may have on the detection of A. japonicus calls. An array of four hydrophones was deployed to record and locate individual fish from call arrival-time differences. Successive A. japonicus calls produced samples at various ranges between 1 and 100 m from one of the array hydrophones. The three-dimensional localization of calls, together with removal of ambient noise, allowed the determination of source levels for each call category using observed trends in propagation losses and interference. Mean source levels (at 1 m from the hydrophone) of the three call categories were calculated as 163 ± 16 dB re 1 ?Pa for Category 1 calls (short call of 2-5 pulses); 172 ± 4 dB re 1 ?Pa for Category 2 calls (long calls of 11-32 pulses); and 157 ± 5 dB re 1 ?Pa for Category 3 calls (series of successive calls of 1-4 pulses, increasing in call rate). PMID:23145635

  2. On current compositing algorithms

    NASA Technical Reports Server (NTRS)

    Qi, J.; Kerr, Y.

    1994-01-01

    Several techniques exist for compositing the multitemporal NOAA Advanced Very High Resolution Radiometer (AVHRR) data for vegetation studies. The major pixel selection criteria of these techniques rely on the characteristics of the NDVI (Normalized Difference Vegetative Index): appearance of clouds, poor atmospheric conditions, and off-nadir viewing geometries would depress the NDVI values. Consequently, selecting the pixels with the maximum value of NDVI would presumably eliminate these external perturbating effects. However, the maximum NDVI does not always correspond to these ideal conditions. In fact, the NDVI varies with these external factors in an unpredictable way. There was an indication that the maximum NDVI tended to favor the off-nadir view in the forward direction. The resultant composite product would be consequently affected. To improve the multitemporal data via compositing, therefore, both the pixel selection criteria and the classifier NDVI need to be modified or corrected for external factors. The current compositing algorithms were reviewed, and alternatives were proposed to use the combinations of the red and near infrared channels and biological characteristics of vegetation as second criteria in pixel selections. The traditional classifier NDVI was replaced with different vegetation indices. The approach was applied to an AVHRR data set over the HAPEX study site in Niger in 1992. The results showed that the approach improved the AVHRR time series quality and was promising towards the development of an efficient compositing algorithm.

  3. Anomaly Detection in Dynamic Networks of Varying Size

    E-print Network

    La Fond, Timothy; Gallagher, Brian

    2014-01-01

    Dynamic networks, also called network streams, are an important data representation that applies to many real-world domains. Many sets of network data such as e-mail networks, social networks, or internet traffic networks are best represented by a dynamic network due to the temporal component of the data. One important application in the domain of dynamic network analysis is anomaly detection. Here the task is to identify points in time where the network exhibits behavior radically different from a typical time, either due to some event (like the failure of machines in a computer network) or a shift in the network properties. This problem is made more difficult by the fluid nature of what is considered "normal" network behavior. The volume of traffic on a network, for example, can change over the course of a month or even vary based on the time of the day without being considered unusual. Anomaly detection tests using traditional network statistics have difficulty in these scenarios due to their Density Depen...

  4. Hysteresis Can Grant Fitness in Stochastically Varying Environment

    PubMed Central

    Friedman, Gary; McCarthy, Stephen; Rachinskii, Dmitrii

    2014-01-01

    Although the existence of multiple stable phenotypes of living organisms enables random switching between phenotypes as well as non-random history dependent switching called hysteresis, only random switching has been considered in prior experimental and theoretical models of adaptation to variable environments. This work considers the possibility that hysteresis may also evolve together with random phenotype switching to maximize population growth. In addition to allowing the possibility that switching rates between different phenotypes may depend not only on a continuous environmental input variable, but also on the phenotype itself, the present work considers an opportunity cost of the switching events. This opportunity cost arises as a result of a lag phase experimentally observed after phenotype switching and stochastic behavior of the environmental input. It is shown that stochastic environmental variation results in maximal asymptotic growth rate when organisms display hysteresis for sufficiently slowly varying environmental input. At the same time, sinusoidal input does not cause evolution of memory suggesting that the connection between the lag phase, stochastic environmental variation and evolution of hysteresis is a result of a stochastic resonance type phenomenon. PMID:25068284

  5. Sharing programming resources between Bio* projects through remote procedure call and native call stack strategies.

    PubMed

    Prins, Pjotr; Goto, Naohisa; Yates, Andrew; Gautier, Laurent; Willis, Scooter; Fields, Christopher; Katayama, Toshiaki

    2012-01-01

    Open-source software (OSS) encourages computer programmers to reuse software components written by others. In evolutionary bioinformatics, OSS comes in a broad range of programming languages, including C/C++, Perl, Python, Ruby, Java, and R. To avoid writing the same functionality multiple times for different languages, it is possible to share components by bridging computer languages and Bio* projects, such as BioPerl, Biopython, BioRuby, BioJava, and R/Bioconductor. In this chapter, we compare the two principal approaches for sharing software between different programming languages: either by remote procedure call (RPC) or by sharing a local call stack. RPC provides a language-independent protocol over a network interface; examples are RSOAP and Rserve. The local call stack provides a between-language mapping not over the network interface, but directly in computer memory; examples are R bindings, RPy, and languages sharing the Java Virtual Machine stack. This functionality provides strategies for sharing of software between Bio* projects, which can be exploited more often. Here, we present cross-language examples for sequence translation, and measure throughput of the different options. We compare calling into R through native R, RSOAP, Rserve, and RPy interfaces, with the performance of native BioPerl, Biopython, BioJava, and BioRuby implementations, and with call stack bindings to BioJava and the European Molecular Biology Open Software Suite. In general, call stack approaches outperform native Bio* implementations and these, in turn, outperform RPC-based approaches. To test and compare strategies, we provide a downloadable BioNode image with all examples, tools, and libraries included. The BioNode image can be run on VirtualBox-supported operating systems, including Windows, OSX, and Linux. PMID:22399473

  6. Neonatal Intensive Care Unit Safety Culture Varies Widely

    PubMed Central

    Profit, Jochen; Etchegaray, Jason; Petersen, Laura A; Sexton, J Bryan; Hysong, Sylvia J; Mei, Minghua; Thomas, Eric J

    2013-01-01

    background Variation in health care delivery and outcomes in NICUs may be partly explained by differences in safety culture. objective To describe NICU caregiver assessments of safety culture, explore the variability within and between NICUs on safety culture domains, and test for association with caregiver characteristics. methods We surveyed NICU caregivers in a convenience sample of 12 hospitals from a single health care system, using the Safety Attitudes Questionnaire (SAQ). The six scales of the SAQ include teamwork climate, safety climate, job satisfaction, stress recognition, perception of management, and working conditions. For each NICU we calculated scale means, standard deviations and percent positives (percent agreement). results We found substantial variation in safety culture domains among participating NICUs. A composite mean score across the six safety culture domains ranged from 56.3 to 77.8 on a 100-point scale and NICUs in the top four NICUs were significantly different from the bottom four (p < .001). Across the six domains, respondent assessments varied widely, but were least positive on perceptions of management (3–80% positive; mean 33.3%) and stress recognition (18–61% positive; mean 41.3%). Comparisons of SAQ scale scores between NICUs and a previously published cohort of adult ICUs generally revealed higher scores for NICUs. Physicians composite scores were 8.2 (p = .04) and 9.5 (p =.02) points higher than nurses and ancillary personnel. conclusion Significant variation and scope for improvement in safety culture exists among this sample of NICUs. The NICU variation was similar to variation in adult ICUs, but NICU scores were generally higher than adult ICU scores. Future studies should validate whether safety culture as measured with the SAQ correlates with clinical and operational outcomes in the NICU setting. PMID:21930691

  7. Time-varying wavelet estimation and deconvolution by kurtosis maximization

    E-print Network

    van der Baan, Mirko

    Time-varying wavelet estimation and deconvolution by kurtosis maximization Mirko van der Baan1 reveal the phase of a seismic wavelet. It is robust enough to detect time-varying phase changes. Phase deconvo- lution can be achieved using time-varying Wiener filtering. Time-varying wavelet extraction

  8. Vector curvaton with varying kinetic function

    NASA Astrophysics Data System (ADS)

    Dimopoulos, Konstantinos; Kar?iauskas, Mindaugas; Wagstaff, Jacques M.

    2010-01-01

    A new model realization of the vector curvaton paradigm is presented and analyzed. The model consists of a single massive Abelian vector field, with a Maxwell-type kinetic term. By assuming that the kinetic function and the mass of the vector field are appropriately varying during inflation, it is shown that a scale-invariant spectrum of superhorizon perturbations can be generated. These perturbations can contribute to the curvature perturbation of the Universe. If the vector field remains light at the end of inflation it is found that it can generate substantial statistical anisotropy in the spectrum and bispectrum of the curvature perturbation. In this case the non-Gaussianity in the curvature perturbation is predominantly anisotropic, which will be a testable prediction in the near future. If, on the other hand, the vector field is heavy at the end of inflation then it is demonstrated that particle production is approximately isotropic and the vector field alone can give rise to the curvature perturbation, without directly involving any fundamental scalar field. The parameter space for both possibilities is shown to be substantial. Finally, toy models are presented which show that the desired variation of the mass and kinetic function of the vector field can be realistically obtained, without unnatural tunings, in the context of supergravity or superstrings.

  9. Honeybee odometry: performance in varying natural terrain.

    PubMed

    Tautz, Juergen; Zhang, Shaowu; Spaethe, Johannes; Brockmann, Axel; Si, Aung; Srinivasan, Mandyam

    2004-07-01

    Recent studies have shown that honeybees flying through short, narrow tunnels with visually textured walls perform waggle dances that indicate a much greater flight distance than that actually flown. These studies suggest that the bee's "odometer" is driven by the optic flow (image motion) that is experienced during flight. One might therefore expect that, when bees fly to a food source through a varying outdoor landscape, their waggle dances would depend upon the nature of the terrain experienced en route. We trained honeybees to visit feeders positioned along two routes, each 580 m long. One route was exclusively over land. The other was initially over land, then over water and, finally, again over land. Flight over water resulted in a significantly flatter slope of the waggle-duration versus distance regression, compared to flight over land. The mean visual contrast of the scenes was significantly greater over land than over water. The results reveal that, in outdoor flight, the honeybee's odometer does not run at a constant rate; rather, the rate depends upon the properties of the terrain. The bee's perception of distance flown is therefore not absolute, but scene-dependent. These findings raise important and interesting questions about how these animals navigate reliably. PMID:15252454

  10. Honeybee Odometry: Performance in Varying Natural Terrain

    PubMed Central

    Tautz, Juergen; Zhang, Shaowu; Spaethe, Johannes; Brockmann, Axel; Si, Aung

    2004-01-01

    Recent studies have shown that honeybees flying through short, narrow tunnels with visually textured walls perform waggle dances that indicate a much greater flight distance than that actually flown. These studies suggest that the bee's “odometer” is driven by the optic flow (image motion) that is experienced during flight. One might therefore expect that, when bees fly to a food source through a varying outdoor landscape, their waggle dances would depend upon the nature of the terrain experienced en route. We trained honeybees to visit feeders positioned along two routes, each 580 m long. One route was exclusively over land. The other was initially over land, then over water and, finally, again over land. Flight over water resulted in a significantly flatter slope of the waggle-duration versus distance regression, compared to flight over land. The mean visual contrast of the scenes was significantly greater over land than over water. The results reveal that, in outdoor flight, the honeybee's odometer does not run at a constant rate; rather, the rate depends upon the properties of the terrain. The bee's perception of distance flown is therefore not absolute, but scene-dependent. These findings raise important and interesting questions about how these animals navigate reliably. PMID:15252454

  11. Time-Varying Modeling of Cerebral Hemodynamics

    PubMed Central

    Marmarelis, Vasilis Z.; Shin, Dae C.; Orme, Melissa; Zhang, Rong

    2014-01-01

    The scientific and clinical importance of cerebral hemodynamics has generated considerable interest in their quantitative understanding via computational modeling. In particular, two aspects of cerebral hemodynamics, Cerebral Flow Autoregulation (CFA) and CO2 Vasomotor Reactivity (CVR), have attracted much attention because they are implicated in many important clinical conditions and pathologies (orthostatic intolerance, syncope, hypertension, stroke, vascular dementia, MCI, Alzheimer’s disease and other neurodegenerative diseases with cerebrovascular components). Both CFA and CVR are dynamic physiological processes by which cerebral blood flow is regulated in response to fluctuations in cerebral perfusion pressure and blood CO2 tension. Several modeling studies to date have analyzed beat-to-beat hemodynamic data in order to advance our quantitative understanding of CFA-CVR dynamics. A confounding factor in these studies is the fact that the dynamics of the CFA-CVR processes appear to vary with time (i.e. changes in cerebrovascular characteristics) due to neural, endocrine and metabolic effects. This paper seeks to address this issue by tracking the changes in linear time-invariant models obtained from short successive segments of data from 10 healthy human subjects. The results suggest that systemic variations exist but have stationary statistics and, therefore, the use of time-invariant modeling yields “time-averaged models” of physiological and clinical utility. PMID:24184697

  12. General dynamics of varying-alpha universes

    NASA Astrophysics Data System (ADS)

    Barrow, John D.; Graham, Alexander A. H.

    2013-11-01

    We introduce and study extensions of the varying alpha theory of Bekenstein-Sandvik-Barrow-Magueijo to allow for an arbitrary coupling function and self-interaction potential term in the theory. We study the full evolution equations without assuming that variations in alpha have a negligible effect on the expansion scale factor and the matter density evolution, as was assumed in earlier studies. The background Friedmann-Robertson-Walker cosmology of this model in the cases of zero and nonzero spatial curvature is studied in detail, using dynamical systems techniques, for a wide class of potentials and coupling functions. All the asymptotic behaviors are found, together with some new solutions. We study the cases where the electromagnetic parameter, zeta, is positive and negative, corresponding to magnetic and electrostatic energy domination in the nonrelativistic matter. In particular, we investigate the cases where the scalar field driving alpha variations has exponential and power-law self-interaction potentials and the behavior of theories where the coupling constant between matter and alpha variations is no longer a constant.

  13. Induction accelerators with varied core materials

    NASA Astrophysics Data System (ADS)

    Molvik, A. W.; Meier, W. R.; Faltens, A.; Reginato, L. L.; Smith, C. H.

    1998-11-01

    We discuss system code studies of high-current heavy-ion accelerators, involving tradeoffs among induction core materials with varying ?B, magnetization loss, and cost. Large masses of magnetic core material are required for many of the induction accelerator-based projects currently under study; the quantities required exceed 10^7 kg for a linear heavy-ion fusion driver, so core performance and cost are critical issues. We have evaluated moderate size, 1 to 11 kg, cores of amorphous and nanocrystalline alloys. We characterized the materials in terms of the flux swing ?B from -B_remanent to +B_saturation, and the energy loss versus dB/dt. We found sources for each material that could apply an insulating coating, wind, and then anneal the cores at 350-550^o C. The result is core performance near the ultimate small sample performance, with higher ?B and lower losses than the earlier approaches of using as-cast material or rewinding after anneal, usually insulated with thin mylar ( 4?m thick).

  14. Pediatric lupus: varied haematological picture and presentation.

    PubMed

    Thakur, Neha; Chandra, Jagdish; Dhingra, Bhavna; Singh, V

    2015-03-01

    Systemic lupus erythematosus (SLE) is a chronic, multisystem, autoimmune disease characterized by periods of increased disease activity caused by inflammation of blood vessels and connective tissue. Pediatric patients with SLE have a more severe clinical course when compared with adults. Patients commonly present with rash, fever, and arthritis, although the presentation may be unpredictable. Hematological findings are more predominant in children than adults. Thirty-nine percent of children with SLE will develop hematological abnormalities, one of the American Rheumatic Association criteria for classifying the disease. In our case series we found varied hematological picture and presentation. We present here four case reports of SLE cases with interesting hematological features. Our first case is a 13 month old female child who was initially diagnosed as Evans syndrome and 2 years later diagnosed as SLE. Second case is a 3 year old male child who had SLE with warm antibody AIHA. Third case is a 6 year old female child who presented with AIHA and was diagnosed with SLE 6 years later. Fourth case is a 6 year old female child diagnosed as SLE with aplastic anemia. Hematological findings should be carefully assessed and treated in order to decrease disease related morbidity. PMID:25548448

  15. Estimation of the continuously varying Doppler effect

    NASA Astrophysics Data System (ADS)

    Nelson, D. J.; Troxell, S. J.

    2010-04-01

    There are many applications for which it is important to resolve the location and motion of a target position. For the static situation in which a target transmitter and several receivers are not in motion, the target may be completely resolved by triangulation using relative time delays estimated by several receivers at known locations. These delays are normally estimated from the location of peaks in the magnitude of the cross-correlation function. For active radars, a transmitted signal is reflected by the target, and range and radial velocity are estimated from the delay and Doppler effects on the received signal. In this process, Doppler effects are conventionally modeled as a shift in frequency, and delay and Doppler are estimated from a cross-ambiguity function (CAF) in which delay and Doppler frequency shift are assumed to be independent and approximately constant. Delay and Doppler are jointly estimated as the location of the peak magnitude of the CAF plane. We present methods for accurately estimating delay for the static case and delay and the time-varying Doppler effects for non-static models, such as the radar model.

  16. Stratospheric Impact of Varying Sea Surface Temperatures

    NASA Technical Reports Server (NTRS)

    Newman, Paul A.; Nash, Eric R.; Nielsen, Jon E.; Waugh, Darryn; Pawson, Steven

    2004-01-01

    The Finite-Volume General Circulation Model (FVGCM) has been run in 50 year simulations with the: 1) 1949-1999 Hadley Centre sea surface temperatures (SST), and 2) a fixed annual cycle of SSTs. In this presentation we first show that the 1949-1999 FVGCM simulation produces a very credible stratosphere in comparison to an NCEP/NCAR reanalysis climatology. In particular, the northern hemisphere has numerous major and minor stratospheric warming, while the southern hemisphere has only a few over the 50-year simulation. During the northern hemisphere winter, temperatures are both warmer in the lower stratosphere and the polar vortex is weaker than is found in the mid-winter southern hemisphere. Mean temperature differences in the lower stratosphere are shown to be small (less than 2 K), and planetary wave forcing is found to be very consistent with the climatology. We then will show the differences between our varying SST simulation and the fixed SST simulation in both the dynamics and in two parameterized trace gases (ozone and methane). In general, differences are found to be small, with subtle changes in planetary wave forcing that lead to reduced temperatures in the SH and increased temperatures in the NH.

  17. On Discrete-Time Modeling of Time-Varying WSSUS Fading Channels

    Microsoft Academic Search

    Christian Sgraja; Chengshan Xiao

    2006-01-01

    In this paper, we consider the serial concatenation of linear time-varying (LTV) systems and its impact on the discrete-time modeling of wide-sense stationary uncorrelated scattering (WSSUS) fading channels. By deriving an expression for the composite impulse response of the overall concatenated system, we find that unlike the time-invariant case, the concatenation of LTV systems is not commutative, i.e., the order

  18. Do social networks of female northern long-eared bats vary with reproductive period and age?

    Microsoft Academic Search

    Krista J. Patriquin; Marty L. Leonard; Hugh G. Broders; Colin J. Garroway

    2010-01-01

    Social structure, which is a function of the patterns of interactions among individuals, is particularly variable in fission–fusion\\u000a societies. The underlying factors that drive this variation are poorly understood. Female northern long-eared bats (Myotis septentrionalis) live in fission–fusion societies where females form preferred associations within groups that vary daily in size and composition\\u000a as individuals switch roosts. The goal of

  19. Deformations of thick two-material cylinder under axially varying radial pressure

    NASA Technical Reports Server (NTRS)

    Patel, Y. A.

    1976-01-01

    Stresses and deformations in thick, short, composite cylinder subjected to axially varying radial pressure are studied. Effect of slippage at the interface is examined. In the NASTRAN finite element model, multipoint constraint feature is utilized. Results are compared with theoretical analysis and SAP-IV computer code. Results from NASTRAN computer code are in good agreement with the analytical solutions. Results suggest a considerable influence of interfacial slippage on the axial bending stresses in the cylinder.

  20. Contemporary spirituality: a call to wholeness.

    PubMed

    Coleman, H

    1986-06-01

    Our society and thus our health care organizations are beset by a dualistic perspective that identifies some groups as embodying "masculine" characteristics that are desirable, implying that other groups are less valuable. This perspective, visible in ageism, sexism, and racism, threatens the call to live and heal as Jesus lived and healed, which is the cornerstone of the Catholic health care ministry. A contemporary wholistic spirituality must be articulated that emphasizes individual responsibility for living as a person who believes in the dignity of all persons created by God. Modifying the language of health care is one way to better reflect a wholistic orientation. Two expressions that require special attention are "health care provider" and "patient." Substituting "health care promoter" and "client" for these terms would emphasize the health care ministry's role in helping persons with health care needs to be involved in the healing process. Since a health care organization's effectiveness depends on its members' commitment to healing, it is imperative that the organization's values be modeled and communicated to the members through the organization's decisions and activities. It likewise is important that those involved in the healing ministry reflect on their spirituality, their relationships with self, God, and others, to monitor those values that affect their relationships and experiences. PMID:10276825

  1. Calcific uremic arteriolopathy: a call for action.

    PubMed

    Brandenburg, Vincent M; Cozzolino, Mario; Mazzaferro, Sandro

    2014-11-01

    Calciphylaxis (calcific uremic arteriolopathy [CUA]) is a threatening disease that increasingly is acknowledged as a challenging condition at the interface of nephrology, dermatology, and cardiology. The primary CUA diagnosis is determined most often in nephrology care units because the vast majority of affected cases are detected in patients with advanced or end-stage renal disease. The typical clinical cascade starts with severe pain in initially often inconspicuous skin areas, which might progress to deep tissue ulcerations. Ulcer development is a severe complication with particularly high morbidity and mortality. Unfortunately, there has been a certain stagnancy regarding the slow progress in our understanding of how and why CUA develops. In addition, several important open issues regarding therapy have not been addressed successfully yet. Therefore, the European Renal Association - European Dialysis and Transplant Association (ERA-EDTA) scientific working group Chronic Kidney Disease-Mineral and Bone Disorders (CKD-MBD) has accepted the challenge and has initiated a call for action by defining calciphylaxis as one of the outstanding research targets for the upcoming years. PMID:25498382

  2. Development of echolocation calls and neural selectivity for echolocation calls in the pallid bat.

    PubMed

    Razak, Khaleel A; Fuzessery, Zoltan M

    2014-08-20

    Studies of birdsongs and neural selectivity for songs have provided important insights into principles of concurrent behavioral and auditory system development. Relatively little is known about mammalian auditory system development in terms of vocalizations or other behaviorally relevant sounds. This review suggests echolocating bats are suitable mammalian model systems to understand development of auditory behaviors. The simplicity of echolocation calls with known behavioral relevance and strong neural selectivity provides a platform to address how natural experience shapes cortical receptive field (RF) mechanisms. We summarize recent studies in the pallid bat that followed development of echolocation calls and cortical processing of such calls. We also discuss similar studies in the mustached bat for comparison. These studies suggest: (1) there are different developmental sensitive periods for different acoustic features of the same vocalization. The underlying basis is the capacity for some components of the RF to be modified independent of others. Some RF computations and maps involved in call processing are present even before the cochlea is mature and well before use of echolocation in flight. Others develop over a much longer time course. (2) Normal experience is required not just for refinement, but also for maintenance, of response properties that develop in an experience independent manner. (3) Experience utilizes millisecond range changes in timing of inhibitory and excitatory RF components as substrates to shape vocalization selectivity. We suggest that bat species and call diversity provide a unique opportunity to address developmental constraints in the evolution of neural mechanisms of vocalization processing. © 2014 Wiley Periodicals, Inc. Develop Neurobiol, 2014. PMID:25142131

  3. Ambient noise induces independent shifts in call frequency and amplitude within the Lombard effect in echolocating bats

    PubMed Central

    Hage, Steffen R.; Jiang, Tinglei; Berquist, Sean W.; Feng, Jiang; Metzner, Walter

    2013-01-01

    The Lombard effect, an involuntary rise in call amplitude in response to masking ambient noise, represents one of the most efficient mechanisms to optimize signal-to-noise ratio. The Lombard effect occurs in birds and mammals, including humans, and is often associated with several other vocal changes, such as call frequency and duration. Most studies, however, have focused on noise-dependent changes in call amplitude. It is therefore still largely unknown how the adaptive changes in call amplitude relate to associated vocal changes such as frequency shifts, how the underlying mechanisms are linked, and if auditory feedback from the changing vocal output is needed. Here, we examined the Lombard effect and the associated changes in call frequency in a highly vocal mammal, echolocating horseshoe bats. We analyzed how bandpass-filtered noise (BFN; bandwidth 20 kHz) affected their echolocation behavior when BFN was centered on different frequencies within their hearing range. Call amplitudes increased only when BFN was centered on the dominant frequency component of the bats’ calls. In contrast, call frequencies increased for all but one BFN center frequency tested. Both amplitude and frequency rises were extremely fast and occurred in the first call uttered after noise onset, suggesting that no auditory feedback was required. The different effects that varying the BFN center frequency had on amplitude and frequency rises indicate different neural circuits and/or mechanisms underlying these changes. PMID:23431172

  4. Balancing Act: Student Valuation and Cultural Studies Composition Textbooks

    ERIC Educational Resources Information Center

    Rendleman, Eliot

    2011-01-01

    Composition scholars have contributed many theoretical analyses that WPAs and teachers might apply to first-year composition textbooks in order to make informed decisions about book adoption and implementation. As they offer critiques of the ideological effects of FYC books, many of these studies call composition textbooks "tools" without…

  5. Non-song social call bouts of migrating humpback whales.

    PubMed

    Rekdahl, Melinda L; Dunlop, Rebecca A; Goldizen, Anne W; Garland, Ellen C; Biassoni, Nicoletta; Miller, Patrick; Noad, Michael J

    2015-06-01

    The use of stereotyped calls within structured bouts has been described for a number of species and may increase the information potential of call repertoires. Humpback whales produce a repertoire of social calls, although little is known about the complexity or function of these calls. In this study, digital acoustic tag recordings were used to investigate social call use within bouts, the use of bouts across different social contexts, and whether particular call type combinations were favored. Call order within bouts was investigated using call transition frequencies and information theory techniques. Call bouts were defined through analysis of inter-call intervals, as any calls within 3.9?s of each other. Bouts were produced significantly more when new whales joined a group compared to groups that did not change membership, and in groups containing multiple adults escorting a female and calf compared to adult only groups. Although social calls tended to be produced in bouts, there were few repeated bout types. However, the order in which most call types were produced within bouts was non-random and dependent on the preceding call type. These bouts appear to be at least partially governed by rules for how individual components are combined. PMID:26093396

  6. A quasi-min-max MPC algorithm for linear parameter varying systems with bounded rate of change of parameters

    Microsoft Academic Search

    Yaohui Lu; Yaman Arkun

    2000-01-01

    We (1999, 2000) have introduced a model predictive control (MPC) algorithm for polytopic linear parameter varying systems. The algorithm, called quasi-min-max MPC, separates the first stage cost from the infinite horizon quadratic objective function and bounds the rest of the cost by a quadratic term. For predictions the future state matrices are assumed to belong to a fixed polytope. In

  7. Composite Materials

    NASA Technical Reports Server (NTRS)

    1985-01-01

    Composites are lighter and stronger than metals. Aramid fibers like Kevlar and Nomex were developed by DuPont Corporation and can be combined in a honeycomb structure which can give an airplane a light, tough structure. Composites can be molded into many aerodynamic shapes eliminating rivets and fasteners. Langley Research Center has tested composites for both aerospace and non-aerospace applications. They are also used in boat hulls, military shelters, etc.

  8. Energy on call: a more efficient peaking system would exploit the advantages of energy storage, while conserving capital and resources

    Microsoft Academic Search

    J. A. Casazza; T. R. Schneider; V. T. Sulzberger

    1976-01-01

    Energy demand varies with the seasons, the days of the week, and the hours of each day. The power industry must maintain generation, transmission, and distribution capacity to meet peak demands on call. A more efficient peaking system would exploit the advantages of energy storage, while conserving capital and resources. It has been estimated that 300 million barrels of oil

  9. Hypothermia for Stroke: call to action 2010.

    PubMed

    Macleod, Malcolm R; Petersson, Jesper; Norrving, Bo; Hacke, Werner; Dirnagl, Ulrich; Wagner, Markus; Schwab, Stefan

    2010-12-01

    The European Hypothermia Stroke Research Workshop was held in January 2010, in response to the alarming prospects of a significant increase of stroke expected in the coming years globally. Considering that a minority of patients (around 10%) are currently eligible for thrombolytic treatment, there is a need for an efficacious, cost-effective novel therapy that can be implemented broadly within European health care systems. Accordingly, the primary objective of the workshop was the definition of a research agenda aiming to assess the therapeutic benefits of hypothermia in patients with acute ischaemic stroke. The meeting was organised by the European Stroke Research Network for Hypothermia (EuroHyp) and attended by the representatives of World Stroke Organisation, European Stroke Organisation, Stroke Alliance for Europe, Society for Cryobiology and other organisations--specifically the European Space Agency, and small- and medium-sized enterprises based in EU member states. The participants adopted the 'Hypothermia for Stroke--Call to Action 2010', a declaration specifying the priorities for hypothermia research in acute ischaemic stroke. The research programme outlined--a clinical study programme designed to identify and validate therapeutic cooling as a novel treatment providing benefit to a large number of stroke patients--contains a well-integrated series of Phase II studies aiming to refine the intervention (depth, duration, and mode of cooling; antishivering strategy; patient selection) and a pivotal Phase III clinical trial. The proposed integrated Phase II and III clinical study programme would test the effectiveness of this optimised intervention, and would allow the development of evidence-based Clinical Practice Guidelines describing the optimal use of therapeutic hypothermia as a treatment strategy for stroke. PMID:21086713

  10. Magnetostriction and Compositional Gradients in Boat-Evaporated Permalloy Films

    Microsoft Academic Search

    T. C. Penn; F. G. West

    1967-01-01

    Magnetostriction measurements on Permalloy films prepared by vacuum evaporation from a tungsten boat indicate an average Fe enrichment of about 2% above the original melt composition. In addition it is shown that the film composition varies continuously through the thickness from 4% to 7% per 1000 Å for typical evaporation conditions. Compositional gradients of even smaller magnitude are capable of

  11. Individual differences and repeatability in vocal production: stress-induced calling exposes a songbird's personality

    NASA Astrophysics Data System (ADS)

    Guillette, Lauren M.; Sturdy, Christopher B.

    2011-11-01

    Recent research in songbirds has demonstrated that male singing behavior varies systematically with personality traits such as exploration and risk taking. Here we examine whether the production of bird calls, in addition to bird songs, is repeatable and related to exploratory behavior, using the black-capped chickadee ( Poecile atricapillus) as a model. We assessed the exploratory behavior of individual birds in a novel environment task. We then recorded the vocalizations and accompanying motor behavior of both male and female chickadees, over the course of several days, in two different contexts: a control condition with no playback and a stressful condition where chick-a-dee mobbing calls were played to individual birds. We found that several vocalizations and behaviors were repeatable within both a control and a stressful context, and across contexts. While there was no relationship between vocal output and exploratory behavior in the control context, production of alarm and chick-a-dee calls in the stressful condition was positively associated with exploratory behavior. These findings are important because they show that bird calls, in addition to bird song, are an aspect of personality, in that calls are consistent both within and across contexts, and covary with other personality measures (exploration).

  12. Individual differences and repeatability in vocal production: stress-induced calling exposes a songbird's personality.

    PubMed

    Guillette, Lauren M; Sturdy, Christopher B

    2011-11-01

    Recent research in songbirds has demonstrated that male singing behavior varies systematically with personality traits such as exploration and risk taking. Here we examine whether the production of bird calls, in addition to bird songs, is repeatable and related to exploratory behavior, using the black-capped chickadee (Poecile atricapillus) as a model. We assessed the exploratory behavior of individual birds in a novel environment task. We then recorded the vocalizations and accompanying motor behavior of both male and female chickadees, over the course of several days, in two different contexts: a control condition with no playback and a stressful condition where chick-a-dee mobbing calls were played to individual birds. We found that several vocalizations and behaviors were repeatable within both a control and a stressful context, and across contexts. While there was no relationship between vocal output and exploratory behavior in the control context, production of alarm and chick-a-dee calls in the stressful condition was positively associated with exploratory behavior. These findings are important because they show that bird calls, in addition to bird song, are an aspect of personality, in that calls are consistent both within and across contexts, and covary with other personality measures (exploration). PMID:21928067

  13. Isosurface Extraction in Time-Varying Fields Using a Temporal Hierarchical Index Tree

    NASA Technical Reports Server (NTRS)

    Shen, Han-Wei; Gerald-Yamasaki, Michael (Technical Monitor)

    1998-01-01

    Many high-performance isosurface extraction algorithms have been proposed in the past several years as a result of intensive research efforts. When applying these algorithms to large-scale time-varying fields, the storage overhead incurred from storing the search index often becomes overwhelming. this paper proposes an algorithm for locating isosurface cells in time-varying fields. We devise a new data structure, called Temporal Hierarchical Index Tree, which utilizes the temporal coherence that exists in a time-varying field and adoptively coalesces the cells' extreme values over time; the resulting extreme values are then used to create the isosurface cell search index. For a typical time-varying scalar data set, not only does this temporal hierarchical index tree require much less storage space, but also the amount of I/O required to access the indices from the disk at different time steps is substantially reduced. We illustrate the utility and speed of our algorithm with data from several large-scale time-varying CID simulations. Our algorithm can achieve more than 80% of disk-space savings when compared with the existing techniques, while the isosurface extraction time is nearly optimal.

  14. Nanoparticle release from dental composites.

    PubMed

    Van Landuyt, K L; Hellack, B; Van Meerbeek, B; Peumans, M; Hoet, P; Wiemann, M; Kuhlbusch, T A J; Asbach, C

    2014-01-01

    Dental composites typically contain high amounts (up to 60 vol.%) of nanosized filler particles. There is a current concern that dental personnel (and patients) may inhale nanosized dust particles (<100 nm) during abrasive procedures to shape, finish or remove restorations but, so far, whether airborne nanoparticles are released has never been investigated. In this study, composite dust was analyzed in real work conditions. Exposure measurements of dust in a dental clinic revealed high peak concentrations of nanoparticles in the breathing zone of both dentist and patient, especially during aesthetic treatments or treatments of worn teeth with composite build-ups. Further laboratory assessment confirmed that all tested composites released very high concentrations of airborne particles in the nanorange (>10(6)cm(-3)). The median diameter of airborne composite dust varied between 38 and 70 nm. Electron microscopic and energy dispersive X-ray analysis confirmed that the airborne particles originated from the composite, and revealed that the dust particles consisted of filler particles or resin or both. Though composite dust exhibited no significant oxidative reactivity, more toxicological research is needed. To conclude, on manipulation with the bur, dental composites release high concentrations of nanoparticles that may enter deeply into the lungs. PMID:24121193

  15. Representation of individual elements of a complex call sequence in primary auditory cortex

    PubMed Central

    Wallace, Mark N.; Grimsley, Jasmine M. S.; Anderson, Lucy A.; Palmer, Alan R.

    2013-01-01

    Conspecific communication calls can be rhythmic or contain extended, discontinuous series of either constant or frequency modulated harmonic tones and noise bursts separated by brief periods of silence. In the guinea pig, rhythmic calls can produce isomorphic responses within the primary auditory cortex (AI) where single units respond to every call element. Other calls such as the chutter comprise a series of short irregular syllables that vary in their spectral content and are more like human speech. These calls can also evoke isomorphic responses, but may only do so in fields in the auditory belt and not in AI. Here we present evidence that cells in AI treat the individual elements within a syllable as separate auditory objects and respond selectively to one or a subset of them. We used a single chutter exemplar to compare single/multi-unit responses in the low-frequency portion of AI—AI(LF) and the low-frequency part of the thalamic medial geniculate body—MGB(LF) in urethane anaesthetized guinea pigs. Both thalamic and cortical cells responded with brief increases in firing rate to one, or more, of the 8 main elements present in the chutter call. Almost none of the units responded to all 8 elements. While there were many different combinations of responses to between one and five of the elements, MBG(LF) and AI(LF) neurons exhibited the same specific types of response combinations. Nearby units in the upper layers of the cortex tended to respond to similar combinations of elements while the deep layers were less responsive. Thus, the responses from a number of AI units would need to be combined in order to represent the entire chutter call. Our results don't rule out the possibility of constructive convergence but there was no evidence that a convergence of inputs within AI led to a complete representation of all eight elements. PMID:24198766

  16. Composite material

    Microsoft Academic Search

    Stacy A. Hutchens; Jonathan Woodward; Barbara R. Evans; Hugh M. ONeill

    2012-01-01

    A composite biocompatible hydrogel material includes a porous polymer matrix, the polymer matrix including a plurality of pores and providing a Young's modulus of at least 10 GPa. A calcium comprising salt is disposed in at least some of the pores. The porous polymer matrix can comprise cellulose, including bacterial cellulose. The composite can be used as a bone graft

  17. Electrode compositions

    DOEpatents

    Block, J.; Fan, X.

    1998-10-27

    An electrode composition is described for use as an electrode in a non-aqueous battery system. The electrode composition contains an electrically active powder in a solid polymer and, as a dispersant, a C{sub 8}-C{sub 15} alkyl capped oligomer of a hexanoic acid that is electrochemically inert at 2.5--4.5 volts.

  18. Call for Papers: Photonics in Switching

    NASA Astrophysics Data System (ADS)

    Wosinska, Lena; Glick, Madeleine

    2006-04-01

    Call for Papers: Photonics in Switching

    Guest Editors:

    Lena Wosinska, Royal Institute of Technology (KTH) / ICT Sweden Madeleine Glick, Intel Research, Cambridge, UK

    Technologies based on DWDM systems allow data transmission with bit rates of Tbit/s on a single fiber. To facilitate this enormous transmission volume, high-capacity and high-speed network nodes become inevitable in the optical network. Wideband switching, WDM switching, optical burst switching (OBS), and optical packet switching (OPS) are promising technologies for harnessing the bandwidth of WDM optical fiber networks in a highly flexible and efficient manner. As a number of key optical component technologies approach maturity, photonics in switching is becoming an increasingly attractive and practical solution for the next-generation of optical networks. The scope of this special issue is focused on the technology and architecture of optical switching nodes, including the architectural and algorithmic aspects of high-speed optical networks.

    Scope of Submission

    The scope of the papers includes, but is not limited to, the following topics:
    • WDM node architectures
    • Novel device technologies enabling photonics in switching, such as optical switch fabrics, optical memory, and wavelength conversion
    • Routing protocols
    • WDM switching and routing
    • Quality of service
    • Performance measurement and evaluation
    • Next-generation optical networks: architecture, signaling, and control
    • Traffic measurement and field trials
    • Optical burst and packet switching
    • OBS/OPS node architectures
    • Burst/Packet scheduling and routing algorithms
    • Contention resolution/avoidance strategies
    • Services and applications for OBS/OPS (e.g., grid networks, storage-area networks, etc.)
    • Burst assembly and ingress traffic shaping
    • Hybrid OBS/TDM or OBS/wavelength routing

    Manuscript Submission

    To submit to this special issue, follow the normal procedure for submission to JON and select ``Photonics in Switching' in the features indicator of the online submission form. For all other questions relating to this feature issue, please send an e-mail to jon@osa.org, subject line ``Photonics in Switching.' Additional information can be found on the JON website: http://www.osa-jon.org/journal/jon/author.cfm. Submission Deadline: 15 September 2006

  19. 31 CFR 50.94 - Data call authority.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...Data call authority. 50.94 Section 50.94 Money and Finance: Treasury Office of the Secretary of the Treasury TERRORISM RISK INSURANCE PROGRAM Cap on Annual Liability § 50.94 Data call authority. For the purpose of determining...

  20. 31 CFR 50.94 - Data call authority.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...Data call authority. 50.94 Section 50.94 Money and Finance: Treasury Office of the Secretary of the Treasury TERRORISM RISK INSURANCE PROGRAM Cap on Annual Liability § 50.94 Data call authority. For the purpose of determining...

  1. 31 CFR 50.94 - Data call authority.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...Data call authority. 50.94 Section 50.94 Money and Finance: Treasury Office of the Secretary of the Treasury TERRORISM RISK INSURANCE PROGRAM Cap on Annual Liability § 50.94 Data call authority. For the purpose of determining...

  2. 47 CFR 64.3001 - Obligation to transmit 911 calls.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Number § 64.3001 Obligation to transmit 911 calls. All telecommunications carriers shall transmit all 911 calls to a PSAP, to a designated statewide default answering point, or to an appropriate local emergency authority as set forth in §...

  3. 47 CFR 64.3001 - Obligation to transmit 911 calls.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Number § 64.3001 Obligation to transmit 911 calls. All telecommunications carriers shall transmit all 911 calls to a PSAP, to a designated statewide default answering point, or to an appropriate local emergency authority as set forth in §...

  4. 47 CFR 64.3001 - Obligation to transmit 911 calls.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...Number § 64.3001 Obligation to transmit 911 calls. All telecommunications carriers shall transmit all 911 calls to a PSAP, to a designated statewide default answering point, or to an appropriate local emergency authority as set forth in §...

  5. 47 CFR 64.3001 - Obligation to transmit 911 calls.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Number § 64.3001 Obligation to transmit 911 calls. All telecommunications carriers shall transmit all 911 calls to a PSAP, to a designated statewide default answering point, or to an appropriate local emergency authority as set forth in §...

  6. 47 CFR 64.3001 - Obligation to transmit 911 calls.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Number § 64.3001 Obligation to transmit 911 calls. All telecommunications carriers shall transmit all 911 calls to a PSAP, to a designated statewide default answering point, or to an appropriate local emergency authority as set forth in §...

  7. 47 CFR 64.605 - Emergency calling requirements.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...callback number, and the CA's identification number, thereby enabling...the CA, or the outbound voice telephone call between...provider, and the CA's identification number for each call, to the...provider, and the CA's identification number must be...

  8. 47 CFR 64.605 - Emergency calling requirements.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...callback number, and the CA's identification number, thereby enabling...the CA, or the outbound voice telephone call between...provider, and the CA's identification number for each call, to the...provider, and the CA's identification number must be...

  9. 47 CFR 64.605 - Emergency calling requirements.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...callback number, and the CA's identification number, thereby enabling...the CA, or the outbound voice telephone call between...provider, and the CA's identification number for each call, to the...provider, and the CA's identification number must be...

  10. 47 CFR 64.605 - Emergency calling requirements.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...callback number, and the CA's identification number, thereby enabling...the CA, or the outbound voice telephone call between...provider, and the CA's identification number for each call, to the...provider, and the CA's identification number must be...

  11. 47 CFR 64.605 - Emergency calling requirements.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...callback number, and the CA's identification number, thereby enabling...the CA, or the outbound voice telephone call between...provider, and the CA's identification number for each call, to the...provider, and the CA's identification number must be...

  12. Alarm OnCall Form (Instructions) Office of Physical Security

    E-print Network

    Moore, Paul A.

    Alarm OnCall Form (Instructions) Office of Physical Security 101 Campus Operations Bowling; Alarm OnCall Form Office of Physical Security 101 Campus Operations Bowling Green State University/Director: ________________________________________________ Chair/Director email: ________________________________________________________ Fax

  13. Call for Papers Distributed Media Technologies and Applications

    E-print Network

    Lau, W. H. Nynson

    Call for Papers Distributed Media Technologies and Applications Special Issue of IEEE Transactions call for papers that present recent development on distributed media technologies, distributed media for original papers that describe novel distributed media technologies and their applications. We

  14. Call for white papers 2015 NSF MRI Program

    E-print Network

    Napier, Terrence

    Call for white papers 2015 NSF MRI Program Pending NSF's release the ability to submit three applications to NSF1. The purpose of this call of Lehigh research programs, and (b) are likely to be competitive in NSF review

  15. 28 CFR 540.102 - Monitoring of inmate telephone calls.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 false Monitoring of inmate telephone calls. 540.102 Section 540...CONTACT WITH PERSONS IN THE COMMUNITY Telephone Regulations for Inmates § 540.102 Monitoring of inmate telephone calls. The Warden shall...

  16. 47 CFR 64.1505 - Restrictions on collect telephone calls.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 2013-10-01 false Restrictions on collect telephone calls. 64.1505 Section 64.1505 Telecommunication...Information Services § 64.1505 Restrictions on collect telephone calls. (a) No common carrier shall provide...

  17. 47 CFR 64.1505 - Restrictions on collect telephone calls.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 2012-10-01 false Restrictions on collect telephone calls. 64.1505 Section 64.1505 Telecommunication...Information Services § 64.1505 Restrictions on collect telephone calls. (a) No common carrier shall provide...

  18. 47 CFR 64.1505 - Restrictions on collect telephone calls.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false Restrictions on collect telephone calls. 64.1505 Section 64.1505 Telecommunication...Information Services § 64.1505 Restrictions on collect telephone calls. (a) No common carrier shall provide...

  19. 28 CFR 540.102 - Monitoring of inmate telephone calls.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false Monitoring of inmate telephone calls. 540.102 Section 540...CONTACT WITH PERSONS IN THE COMMUNITY Telephone Regulations for Inmates § 540.102 Monitoring of inmate telephone calls. The Warden shall...

  20. 28 CFR 540.102 - Monitoring of inmate telephone calls.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 false Monitoring of inmate telephone calls. 540.102 Section 540...CONTACT WITH PERSONS IN THE COMMUNITY Telephone Regulations for Inmates § 540.102 Monitoring of inmate telephone calls. The Warden shall...

  1. 28 CFR 540.102 - Monitoring of inmate telephone calls.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 false Monitoring of inmate telephone calls. 540.102 Section 540...CONTACT WITH PERSONS IN THE COMMUNITY Telephone Regulations for Inmates § 540.102 Monitoring of inmate telephone calls. The Warden shall...

  2. 28 CFR 540.102 - Monitoring of inmate telephone calls.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 false Monitoring of inmate telephone calls. 540.102 Section 540...CONTACT WITH PERSONS IN THE COMMUNITY Telephone Regulations for Inmates § 540.102 Monitoring of inmate telephone calls. The Warden shall...

  3. 28 CFR 540.103 - Inmate telephone calls to attorneys.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 2012-07-01 false Inmate telephone calls to attorneys. 540.103 Section...CONTACT WITH PERSONS IN THE COMMUNITY Telephone Regulations for Inmates § 540.103 Inmate telephone calls to attorneys. The Warden...

  4. 47 CFR 64.1505 - Restrictions on collect telephone calls.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Restrictions on collect telephone calls. 64.1505 Section 64.1505 Telecommunication...Information Services § 64.1505 Restrictions on collect telephone calls. (a) No common carrier shall provide...

  5. 28 CFR 540.103 - Inmate telephone calls to attorneys.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 2013-07-01 false Inmate telephone calls to attorneys. 540.103 Section...CONTACT WITH PERSONS IN THE COMMUNITY Telephone Regulations for Inmates § 540.103 Inmate telephone calls to attorneys. The Warden...

  6. 28 CFR 540.103 - Inmate telephone calls to attorneys.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 2014-07-01 false Inmate telephone calls to attorneys. 540.103 Section...CONTACT WITH PERSONS IN THE COMMUNITY Telephone Regulations for Inmates § 540.103 Inmate telephone calls to attorneys. The Warden...

  7. 28 CFR 540.103 - Inmate telephone calls to attorneys.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 2011-07-01 false Inmate telephone calls to attorneys. 540.103 Section...CONTACT WITH PERSONS IN THE COMMUNITY Telephone Regulations for Inmates § 540.103 Inmate telephone calls to attorneys. The Warden...

  8. 47 CFR 64.1505 - Restrictions on collect telephone calls.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false Restrictions on collect telephone calls. 64.1505 Section 64.1505 Telecommunication...Information Services § 64.1505 Restrictions on collect telephone calls. (a) No common carrier shall provide...

  9. 28 CFR 540.103 - Inmate telephone calls to attorneys.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 2010-07-01 false Inmate telephone calls to attorneys. 540.103 Section...CONTACT WITH PERSONS IN THE COMMUNITY Telephone Regulations for Inmates § 540.103 Inmate telephone calls to attorneys. The Warden...

  10. Disentangling Composite Spectrum Hot Subdwarfs

    NASA Astrophysics Data System (ADS)

    Stark, M. A.; Wade, R. A.

    2005-07-01

    We give preliminary results from a spectroscopic study of composite spectrum hot subdwarfs (sd+late-type). We obtained spectra of a sample of hot subdwarfs selected from the Catalogue of Spectroscopically Identified Hot Subdwarfs (Kilkenny et al. 1998) on the basis of near-infrared photometry from the Two Micron All Sky Survey (2MASS). The sample consists of 20 photometric and spectroscopic single and 54 composite hot subdwarfs, 6 resolved (or barely resolved) visual doubles, and 5 objects with emission lines or broad absorption lines with emission cores. Spectra of 84 ``standard'' (single late-type) stars with Hipparcos parallaxes were also obtained for calibration. These observations cover 4600-8900 Å with ?3 Å resolution. We measured equivalent width-like indices around Mg I b, Na I D, the Ca II infrared triplet, H?, and H?. Using the single late-type star observations combined with model energy distributions, we explore how the measured indices of a composite spectrum vary as the temperature and luminosity of the late-type companion are varied and as the temperature and radius of the hot subdwarf are varied. We use the measured indices of the composite systems to estimate the temperature and gravity of the late-type star, taking into account the dilution of its spectral features by light from the hot subdwarf.

  11. Song trait similarity in great tits varies with social structure.

    PubMed

    Snijders, Lysanne; van der Eijk, Jerine; van Rooij, Erica P; de Goede, Piet; van Oers, Kees; Naguib, Marc

    2015-01-01

    For many animals, long-range signalling is essential to maintain contact with conspecifics. In territorial species, individuals often have to balance signalling towards unfamiliar potential competitors (to solely broadcast territory ownership) with signalling towards familiar immediate neighbours (to also maintain so-called "dear enemy" relations). Hence, to understand how signals evolve due to these multilevel relationships, it is important to understand how general signal traits vary in relation to the overall social environment. For many territorial songbirds dawn is a key signalling period, with several neighbouring individuals singing simultaneously without immediate conflict. In this study we tested whether sharing a territory boundary, rather than spatial proximity, is related to similarity in dawn song traits between territorial great tits (Parus major) in a wild personality-typed population. We collected a large dataset of automatized dawn song recordings from 72 unique male great tits, during the fertile period of their mate, and compared specific song traits between neighbours and non-neighbours. We show here that both song rate and start time of dawn song were repeatable song traits. Moreover, neighbours were significantly more dissimilar in song rate compared to non-neighbours, while there was no effect of proximity on song rate similarity. Additionally, similarity in start time of dawn song was unrelated to sharing a territory boundary, but birds were significantly more similar in start time of dawn song when they were breeding in close proximity of each other. We suggest that the dissimilarity in dawn song rate between neighbours is either the result of neighbouring great tits actively avoiding similar song rates to possibly prevent interference, or a passive consequence of territory settlement preferences relative to the types of neighbours. Neighbourhood structuring is therefore likely to be a relevant selection pressure shaping variation in territorial birdsong. PMID:25692873

  12. CALL CENTER OUTSOURCING CONTRACT ANALYSIS O. Zeynep Aksin

    E-print Network

    Karaesmen, Fikri

    CALL CENTER OUTSOURCING CONTRACT ANALYSIS AND CHOICE O. Zeynep Ak¸sin Francis de V´ericourt Fikri; revised August 2005; July 2006 #12;Call Center Outsourcing Contract Analysis and Choice O. Zeynep Ak This paper considers a call center outsourcing contract analysis and choice problem, faced by a contractor

  13. Female Chimpanzees Use Copulation Calls Flexibly to Prevent Social Competition

    Microsoft Academic Search

    Simon W. Townsend; Tobias Deschner; Klaus Zuberbühler

    2008-01-01

    The adaptive function of copulation calls in female primates has been debated for years. One influential idea is that copulation calls are a sexually selected trait, which enables females to advertise their receptive state to males. Male-male competition ensues and females benefit by getting better mating partners and higher quality offspring. We analysed the copulation calling behaviour of wild female

  14. AE5 Security Notions Definitions Implicit in the CAESAR Call

    E-print Network

    Rogaway, Phillip

    AE5 Security Notions Definitions Implicit in the CAESAR Call Chanathip Namprempre1 and Phillip A call for authenticated-encryption (AE) mechanisms, CAESAR, was recently put forward by Dan Bernstein [3]. One surprising feature of the call is the unusual AE interface it describes. The user who wants

  15. The Additional Uses of CALL in the Endangered Language Context

    ERIC Educational Resources Information Center

    Ward, Monica

    2004-01-01

    This paper considers the additional uses of CALL in the Endangered Language (EL) context. It briefly reviews ELs and reports on CALL for ELs in general. It then reviews the extra uses of CALL for ELs; these include changing negative attitudes towards the language, arousing interest in the language and contributing to language maintenance and…

  16. Enhancing Security using Calling Activity for Wireless Networks

    Microsoft Academic Search

    Bo Sun; Yang Xiao; Ruhai Wang; Sghaier Guizani

    2006-01-01

    In this paper, we present a detection technique based on Bayes decision rule to identify a group of especially harmful insider attackers - masqueraders. In this technique, we exploit the calling patterns demonstrated by mobile users in mobile cellular networks. Specifically, we formulate the intrusion detection problem as a multi-feature two-class pattern classification problem. Call duration time, call inactivity period

  17. Heterospecific Acoustic Interference: Effects on Calling in Oophaga pumilio

    PubMed Central

    Wong, Stefanie; Parada, Humberto; Narins, Peter M.

    2010-01-01

    Call rate suppression is a common short-term solution for avoiding acoustic interference in animals. It has been widely documented between and within frog species, but the effects of non-anuran calling on frog vocalizations is less well known. Heterospecific acoustic interference on the calling of Oophaga pumilio (Bauer, 1994) (formerly Dendrobates pumilio) males was studied in a lowland, wet tropical forest in SE Nicaragua. Acoustic playback experiments were conducted to characterize the responses of O. pumilio males to interfering calls of cicadas, two species of crickets and a sympatric dendrobatid frog, Phyllobates lugubris. Call rate, call bout duration, percent of time calling, dominant frequency and latency to first-call were analyzed. Significant call rate suppression was observed during all stimulus playbacks, yet no significant differences were found in spontaneous call rates during pre- and post-playback trials. Dominant frequency significantly decreased after P. lugubris playback and first-call latency significantly decreased in response to both cicada and tree cricket playbacks. These results provide robust evidence that O. pumilio males can dynamically modify their calling pattern in unique ways, depending on the source of the heterospecific acoustic interference. PMID:20953296

  18. Verifying Pointer Safety for Programs with Unknown Calls

    E-print Network

    Qin, Shengchao

    Verifying Pointer Safety for Programs with Unknown Calls Chenguang Luo, Florin Craciun, Shengchao with unknown procedure calls. Given a Hoare-style partial correctness specification S = {Pre} C {Post} in separation logic, where the program C contains calls to some unknown pro- cedure U, we infer a specification

  19. Distributed call admission control in mobile\\/wireless networks

    Microsoft Academic Search

    Mahmoud Naghshineh; Mischa Schwartz

    1996-01-01

    The major focus of this paper is distributed call admission control in mobile\\/wireless networks, the purpose of which is to limit the call handoff dropping probability in loss systems or the cell overload probability in lossless systems. Handoff dropping or cell overload are consequences of congestion in wireless networks. Our call admission control algorithm takes into consideration the number of

  20. CALL ADMISSION CONTROL IN WIRELESS MULTIMEDIA NETWORKS Novella Bartolini1

    E-print Network

    Bartolini, Novella

    CALL ADMISSION CONTROL IN WIRELESS MULTIMEDIA NETWORKS Novella Bartolini1 , Imrich Chlamtac2 1.S.A. chlamtac@utdallas.edu Abstract - This paper addresses the call admission control problem for the multimedia, Handoff, Call Admission Control, Random- ized Policies. I. Introduction The advent of the third generation

  1. Mobile cluster based call admission control in wireless mobile networks

    Microsoft Academic Search

    Jeong-Jae Won; Eui-seok Hwang; Hyong-Woo Lee; Choong-Ho Cho

    2003-01-01

    For an efficient and effective connection admission control scheme in wireless mobile network, we propose mobile clustering based distributed call admission control (MC-DCA) scheme, which uses passive reservation information for predicting user mobility. Also, our scheme evaluates the prediction time that considers the call duration time and call dwell time before handoff neighbor cells for evaluating the overload probability.

  2. Call Admission Control in Wireless LAN Boris Bellalta1

    E-print Network

    Bellalta, Boris

    Call Admission Control in Wireless LAN Boris Bellalta1 and Michela Meo2 (1) UPF, Spain (2Model, AUTHOR = {Boris Bellalta and Michela Meo}, TITLE = {{Call Admission Control in WLANs}, in book: {Resource and Michela Meo. Call Admission Control in WLANs, in book: Resource, Mobility, and Security Management

  3. A Call Admission Control protocol for Multimedia Cellular Networks

    E-print Network

    Aboelaze, Mokhtar

    A Call Admission Control protocol for Multimedia Cellular Networks Ayman Elnaggar Dept, or rejected. In this paper, we propose a call admission control protocol for cellular multimedia wireless by maximizing the number of users (calls) admitted to the network. Admission control policies play a crucial

  4. A fuzzy call admission control scheme in wireless networks

    Microsoft Academic Search

    Yufeng Ma; Shenguang Gong; Xiulin Hu; Yunyu Zhang

    2007-01-01

    Scarcity of the spectrum resource and mobility of users make quality of service (QoS) provision a critical issue in wireless networks. This paper presents a fuzzy call admission control scheme to meet the requirement of the QoS. A performance measure is formed as a weighted linear function of new call and handoff call blocking probabilities. Simulation compares the proposed fuzzy

  5. Probabilistic call admission control in wireless multiservice networks

    Microsoft Academic Search

    Dimitrios G. Stratogiannis; Georgios I. Tsiropoulos; John D. Kanellopoulos; Panayotis G. Cottis

    2009-01-01

    A new probabilistic call admission control scheme is proposed for multiservice wireless networks. The new scheme gradually suppresses the admission rate of the new calls and of the calls of each service class (SC) supported considering their priorities independently. The scheme is examined both for a single SC and for multiple SCs under general conditions. The analysis employs Markov chain

  6. TPMG Northern California Appointments and Advice Call Center

    Microsoft Academic Search

    Patricia Conolly; Leslie Levine; Debra J. Amaral; Bruce H. Fireman; Tom Driscoll

    2005-01-01

    Kaiser Permanente (KP) has been developing its use of call centers as a way to provide an expansive set of healthcare services to KP members efficiently and cost effectively. Since 1995, when The Permanente Medical Group (TPMG) began to consolidate primary care phone services into three physical call centers, the TPMG Appointments and Advice Call Center (AACC) has become the

  7. Calling and Career Preparation: Investigating Developmental Patterns and Temporal Precedence

    ERIC Educational Resources Information Center

    Hirschi, Andreas; Herrmann, Anne

    2013-01-01

    The presence of a calling and career development are assumed to be closely related. However, the nature of and reason for this relationship have not been thoroughly investigated. We hypothesized the existence of reciprocal effects between calling and three dimensions of career preparation and assessed the change of the presence of a calling,…

  8. STATISTICAL ANALYSIS OF CALL-CENTER OPERATIONAL DATA

    E-print Network

    Shen, Haipeng

    STATISTICAL ANALYSIS OF CALL-CENTER OPERATIONAL DATA: FORECASTING CALL ARRIVALS, AND ANALYZING CUSTOMER PATIENCE AND AGENT SERVICE HAIPENG SHEN Department of Statistics and Operations Research for future research. This article focuses on statistical research about inbound call centers, in the areas

  9. 76 FR 43688 - Committee Meeting via Conference Call

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-21

    ...Committee Meeting via Conference Call AGENCY: President's...be held via audio conference call, is open to...the full Committee Conference Call are cited below...accommodations made after that date, but...of the PCPID 2011 Report to the President...to complete the writing of the...

  10. 47 CFR 74.791 - Digital call signs.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...74.791 Digital call signs. (a) Digital low power stations. Call signs for digital low power stations will be made up of a prefix consisting...translator stations. Call signs for digital television...stations will be made up of a prefix...

  11. 47 CFR 74.791 - Digital call signs.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...74.791 Digital call signs. (a) Digital low power stations. Call signs for digital low power stations will be made up of a prefix consisting...translator stations. Call signs for digital television...stations will be made up of a prefix...

  12. 47 CFR 74.791 - Digital call signs.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...74.791 Digital call signs. (a) Digital low power stations. Call signs for digital low power stations will be made up of a prefix consisting...translator stations. Call signs for digital television...stations will be made up of a prefix...

  13. Handling emergency calls for service: organizational production of crime statistics

    Microsoft Academic Search

    Dale K. Nesbary

    1998-01-01

    This paper reviews the transformation of requests for police services, specifically examining the various categories of assault. The impact of housing, race, education level, police workload, neighbourhood criminal history, type of call, call-taker input, priority (seriousness) originally assigned to the call, and decision to despatch are assessed. Moreover, the paper will: identify the processes police agencies use in classifying crime;

  14. Craving Ravens: Individual ‘haa’ Call Rates at Feeding Sites as Cues to Personality and Levels of Fission-Fusion Dynamics?

    PubMed Central

    Szipl, Georgine; Bugnyar, Thomas

    2015-01-01

    Common ravens aggregate in large non-breeder flocks for roosting and foraging until they achieve the status of territorial breeders. When discovering food, they produce far-reaching yells or ‘haa’ calls, which attract conspecifics. Due to the high levels of fission-fusion dynamics in non-breeders’ flocks, assemblies of feeding ravens were long thought to represent anonymous aggregations. Yet, non-breeders vary in their degree of vagrancy, and ‘haa’ calls convey individually distinct acoustic features, which are perceived by conspecifics. These findings give rise to the assumption that raven societies are based on differential social relationships on an individual level. We investigated the occurrence of ‘haa’ calling and individual call rates in a group of individually marked free-ranging ravens. Calling mainly occurred in subadult and adult females, which showed low levels of vagrancy. Call rates differed significantly between individuals and with residency status, and were correlated with calling frequency and landing frequency. Local ravens called more often and at higher rates, and were less likely to land at the feeding site than vagrant birds. The results are discussed with respect to individual degrees of vagrancy, which may have an impact on social knowledge and communication in this species. PMID:25984563

  15. Comparison of Linear Microinstability Calculations of Varying Input Realism

    SciTech Connect

    G. Rewoldt

    2003-09-08

    The effect of varying ''input realism'' or varying completeness of the input data for linear microinstability calculations, in particular on the critical value of the ion temperature gradient for the ion temperature gradient mode, is investigated using gyrokinetic and gyrofluid approaches. The calculations show that varying input realism can have a substantial quantitative effect on the results.

  16. naiveBayesCall: An efficient model-based base-calling algorithm for high-throughput

    E-print Network

    Slatkin, Montgomery

    . The base-calling software supplied with GA is called Bustard, which adopts a very efficient algorithm based, it is well-known that the error rate of Bustard becomes substantial in later cycles. Reducing the error rate

  17. BIOCHEMICAL STUDIES ON SO-CALLED SYPHILIS ANTIGEN.

    PubMed

    Noguchi, H; Bronfenbrenner, J

    1911-01-01

    The liver tissues of man and certain animals (dogs, rabbits, guinea pigs, etc.) yield, upon alcoholic extraction, various substances which may be divided by their physical and chemical properties into several groups. While many substances are present in the alcoholic extract, the ones possessing antigenic properties are comparatively few. The latter are responsible for the antigenic properties exhibited by the whole alcoholic extract. The substances extracted with alcohol were fractionated into the following four groups. (a) Substances Insoluble in Ether and Hot Alcohol.-These are chiefly proteins and salts. The proteins are probably the minute particles of larger molecules held in apparent suspension in alcohol until all other substances are removed. The water extracted from the tissues and admixed with alcohol is also an essential factor in extracting these particles in an alcoholic solution. The salts present are the usual physiological constituents of the liver, notably, sodium chloride. The quantity of these substances extracted with alcohol varies greatly with different specimens. Biologically considered, they are neither markedly hemolytic nor anticomplementary and possess no antigenic property for the Wassermann reaction. It is important, however, to note that the proteins bind complement when mixed with certain active human sera. For this reason a preparation of antigen containing this group of substances is unsuitable for use in combination with an active serum, and should, therefore, be rejected. (b) Substances Insoluble in Ether and Soluble in Hot Alcohol.-This group contains soaps, cleavage products of proteins, and small amounts of the bile salts. Soaps and bile salts are very strongly hemolytic and are absolutely unfit for use as antigen. Moreover, their antigenic properties are very slight. It is best to eliminate this group of substances from the preparation of antigen. The quantity of the substances of this group extracted from different specimens of tissue is very variable. (c) Substances Soluble in Ether, Alcohol, and Aceton.-In this group are found varying amounts of fatty acids, both saturated and unsaturated, some neutral fats, cholesterin and many unidentified lipoidal bodies. This group causes either hemolysis or inhibition, of hemolysis. In other words, it is anticomplementary as well as hemolytic in the majority of preparations. At the same time, in some preparations it is, to a certain extent, antigenic. This great variation in the amounts of these substances in given extracts renders their presence in the antigen preparation undesirable. It is not denied, however, that, when added in adequate quantities, some of these substances may improve the activity of the antigenic lipoids. (d) Substances Insoluble in Aceton.-This group of substances consists of phosphatids. The best known among them is, of course, lecithin. Besides lecithin, however, there must be various other phosphatids present in this fraction. It will be noticed that the precipitate formed by mixing the ethereal solution with aceton contains a certain amount of lipoids insoluble in ether as well as in alcohol. Before the fractionation in aceton, all lipoids were soluble in ether or ethyl alcohol. Further analytical work on the nature of the phosphatids contained in this fraction is necessary. This fraction, in general, is more constant in amount in the various liver extracts. Biologically considered, it is the most important. It is usually non-hemolytic, frequently anticomplementary, but much more strongly antigenic than the other fractions. The antigenic strength varies with different preparations, being almost absent in the extracts derived from fatty livers. An aceton insoluble fraction may be strongly antigenic without any other auxiliary effects, or may be accompanied by an anticomplementary property. This fraction does not cause the so-called non-specific reaction with an active human serum. For these reasons it is recommended (as Noguchi has repeatedly done before) that the antigen should be selected from the aceton-insolubl

  18. Composite Materials

    NASA Technical Reports Server (NTRS)

    1988-01-01

    Langley Research Center researchers invented an advanced polymer, a chemical compound formed by uniting many small molecules to create a complex molecule with different chemical properties. The material is a thermoplastic polyimide that resists solvents. Other polymers of this generic type are soluble in solvents, thus cannot be used where solvents are present. High Technology Services (HTS), Inc. licensed technology and is engaged in development and manufacture of high performance plastics, resins and composite materials. Techimer Materials Division is using technology for composite matrix resins that offer heat resistance and protection from radiation, electrical and chemical degradation. Applications of new polymer include molding resins, adhesives and matrix resins for fiber reinforced composites.

  19. Physical and thermal properties of UV curable waterborne polyurethane dispersions incorporating hyperbranched aliphatic polyester of varying generation number

    Microsoft Academic Search

    Anila Asif; Wenfang Shi; Xiaofeng Shen; Kangming Nie

    2005-01-01

    Three series of novel waterborne hyperbranched polyurethane acrylates for UV curable aqueous dispersions (WHPUD) based on hydroxy-functionalized hyperbranched aliphatic polyesters Boltorn™ of varying generation number were investigated. The effects of the overall composition, including acidic and acrylate groups, and functionality of hyperbranched polyester were studied in terms of particle size, rheology, photopolymerization kinetics, dynamic mechanical thermal as well as thermal

  20. Joint call admission control algorithm for reducing call blocking\\/dropping probability in heterogeneous wireless networks supporting multihoming

    Microsoft Academic Search

    Olabisi E. Falowo

    2010-01-01

    A heterogeneous wireless network supporting multihoming gives multi-mode terminals the flexibility to be simultaneously connected to more than one radio access technologies (RATs). Existing joint call admission control (JCAC) algorithms designed for heterogeneous wireless networks block or drop an incoming call when none of the available individual RATs in the heterogeneous network has enough bandwidth to support the incoming call.

  1. Campbell's Monkeys Use Affixation to Alter Call Meaning

    PubMed Central

    Ouattara, Karim; Lemasson, Alban; Zuberbühler, Klaus

    2009-01-01

    Human language has evolved on a biological substrate with phylogenetic roots deep in the primate lineage. Here, we describe a functional analogy to a common morphological process in human speech, affixation, in the alarm calls of free-ranging adult Campbell's monkeys (Cercopithecus campbelli campbelli). We found that male alarm calls are composed of an acoustically variable stem, which can be followed by an acoustically invariable suffix. Using long-term observations and predator simulation experiments, we show that suffixation in this species functions to broaden the calls' meaning by transforming a highly specific eagle alarm to a general arboreal disturbance call or by transforming a highly specific leopard alarm call to a general alert call. We concluded that, when referring to specific external events, non-human primates can generate meaningful acoustic variation during call production that is functionally equivalent to suffixation in human language. PMID:19915663

  2. Seawater Composition

    NSDL National Science Digital Library

    This reference discusses the composition and chemistry of seawater, and how they affect organisms in the sea. Topics include salinity, temperature, density, dissolved gases, dissolved nutrients, and pH.

  3. Thermal, Mechanical and Morphological Characterization of Jute\\/Gelatin Composites

    Microsoft Academic Search

    Mubarak A. Khan; Tuhidul Islam; M. Arifur Rahman; Jahid M. M. Islam; Ruhul A. Khan; M. A. Gafur; M. Z. I. Mollah; A. K. M. Alam

    2010-01-01

    Jute fabrics\\/gelatin biocomposites were fabricated using compression molding. The fiber content in the composite varied from 20–60 wt%. Composites were subjected to mechanical, thermal, water uptake and scanning electron microscopic (SEM) analysis. Composite contained 50 wt% jute showed the best mechanical properties. Tensile strength, tensile modulus, bending strength, bending modulus and impact strength of the 50% jute content composites were found to

  4. Prime & Composites

    NSDL National Science Digital Library

    MHamblin

    2010-10-26

    Students will review the divisibility rules and learn how a prime number differs from a composite number Let's first review the Sieve of Erasthenes with a 100's chart. sieve of Erasthenes Now let's review the divisibility rules. divisibility tests What is a prime number? A prime number is a whole number with exactly two factors. prime number interactive Composite numbers are whole numbers with more than two factors. Have a pencil and paper ready to ...

  5. Composite Flowers

    NSDL National Science Digital Library

    Conrad, Jim

    This site, part of Jim Conrad's Backyard Nature Plant web page, discusses this very large family of plants, which includes the sunflower, dandelion, and chrysanthemum. Here you will find information about the composite family's flower structure and the three kinds of composite flowers: ray only, disk only, and ray and disk. There is also a section on how to analyze disk and ray flower structures.

  6. Hydration kinetics of cement composites with varying water-cement ratio using terahertz spectroscopy

    NASA Astrophysics Data System (ADS)

    Ray, Shaumik; Dash, Jyotirmayee; Devi, Nirmala; Sasmal, Saptarshi; Pesala, Bala

    2015-03-01

    Cement is mixed with water in an optimum ratio to form concrete with desirable mechanical strength and durability. The ability to track the consumption of major cement constituents, viz., Tri- and Dicalcium Silicates (C3S, C2S) reacting with water along with the formation of key hydration products, viz., Calcium-Silicate-Hydrate (C-S-H) which gives the overall strength to the concrete and Calcium Hydroxide (Ca(OH)2), a hydration product which reduces the strength and durability, using an efficient technique is highly desirable. Optimizing the amount of water to be mixed with cement is one of the main parameters which determine the strength of concrete. In this work, THz spectroscopy has been employed to track the variation in hydration kinetics for concrete samples with different water-cement ratios, viz., 0.3, 0.4, 0.5 and 0.6. Results show that for the sample with water-cement ratio of 0.3, significant amount of the C3S and C2S remain unreacted even after the initial hydration period of 28 days while for the cement with water-cement ratio of 0.6, most of the constituents get consumed during this stage. Analysis of the formation of Ca(OH)2 has been done which shows that the concrete sample with water-cement ratio of 0.6 produces the highest amount of Ca(OH)2 due to higher consumption of C3S/C2S in presence of excess water which is not desirable. Samples with water-cement ratio of 0.4 and 0.5 show more controlled reaction during the hydration which can imply formation of an optimized level of desired hydration products resulting in a more mechanically strong and durable concrete.

  7. Modulation of WNx/Ge Schottky barrier height by varying N composition of tungsten nitride

    NASA Astrophysics Data System (ADS)

    Wei, Jiang-Bin; Chi, Xiao-Wei; Lu, Chao; Wang, Chen; Lin, Guang-Yang; Wu, Huan-Da; Huang, Wei; Li, Cheng; Chen, Song-Yan; Liu, Chun-Li

    2015-07-01

    Modulation of the Schottky barrier heights was successfully demonstrated for WNx/p-Ge and WNx/n-Ge contacts by increasing the nitrogen component in the WNx films. The WN0.38/p-Ge contact exhibits rectifying characteristic and an apparent Schottky barrier of 0.49 eV while the WN0.38/n-Ge Schottky contact exhibits quasi-Ohmic current–voltage characteristics. Dipoles formed at the contact interface by the difference of the Pauling electronegativities of Ge and N are confirmed to alleviate the Fermi-level pinning effect. Project supported by the National Natural Science Foundation of China (Grant Nos. 61176092 and 61474094), the National Basic Research Program of China (Grant Nos. 2012CB933503 and 2013CB632103), and the National Natural Science Foundation of China–National Research Foundation of Korea Joint Research Project (Grant No. 11311140251).

  8. Cooperative quantum-behaved particle swarm optimization with dynamic varying search areas and Lévy flight disturbance.

    PubMed

    Li, Desheng

    2014-01-01

    This paper proposes a novel variant of cooperative quantum-behaved particle swarm optimization (CQPSO) algorithm with two mechanisms to reduce the search space and avoid the stagnation, called CQPSO-DVSA-LFD. One mechanism is called Dynamic Varying Search Area (DVSA), which takes charge of limiting the ranges of particles' activity into a reduced area. On the other hand, in order to escape the local optima, Lévy flights are used to generate the stochastic disturbance in the movement of particles. To test the performance of CQPSO-DVSA-LFD, numerical experiments are conducted to compare the proposed algorithm with different variants of PSO. According to the experimental results, the proposed method performs better than other variants of PSO on both benchmark test functions and the combinatorial optimization issue, that is, the job-shop scheduling problem. PMID:24851085

  9. Prairie dog alarm calls encode labels about predator colors.

    PubMed

    Slobodchikoff, C N; Paseka, Andrea; Verdolin, Jennifer L

    2009-05-01

    Some animals have the cognitive capacity to differentiate between different species of predators and generate different alarm calls in response. However, the presence of any addition information that might be encoded into alarm calls has been largely unexplored. In the present study, three similar-sized human females walked through a Gunnison's prairie dog (Cynomys gunnisoni) colony wearing each of three different-colored shirts: blue, green, and yellow. We recorded the alarm calls and used discriminant function analysis to assess whether the calls for the different-colored shirts were significantly different. The results showed that the alarm calls for the blue and the yellow shirts were significantly different, but the green shirt calls were not significantly different from the calls for the yellow shirt. The colors that were detected, with corresponding encoding into alarm calls, reflect the visual perceptual abilities of the prairie dogs. This study suggests that prairie dogs are able to incorporate labels about the individual characteristics of predators into their alarm calls, and that the complexity of information contained in animal alarm calls may be greater than has been previously believed. PMID:19116730

  10. Surface complexation modeling of U(VI) sorption to Hanford sediment with varying geochemical conditions

    SciTech Connect

    Um, Wooyong; Serne, R. Jeffrey; Krupka, Kenneth M.

    2007-04-11

    A series of U(VI) adsorption experiments with varying pH, ionic strength, concentrations of dissolved U(VI) and carbonate was conducted to provide a more realistic database for U(VI) adsorption onto near-field vadose zone sediments at the proposed Integrated Disposal Facility (IDF) on the Hanford Site. The distribution coefficient, Kd, for U(VI) in predicted “pure” glass leachate is 0 mL/g because the glass leachate has high sodium and carbonate concentrations and high pH. The zero adsorption result suggests that uranium will exhibit no retardation when the subsurface geochemistry is controlled by glass leachate. However, U(VI) can be sequestrated even when the pH, carbonate and sodium concentrations reached levels similar to “pure” glass leachate, because U(VI) coprecipitates with calcite. When glass leachate interacts with existing porewater or surrounding sediments, sorption is observed and the numerical value of the U(VI) Kd varies significantly. A non-electrostatic, general composite approach for surface complexation modeling was applied and a combination of two U(VI) surface species, monodentate (SOUO2+) and bidentate (SO2UO2(CO3)2-), simulated very well the measured U(VI) adsorption data. The general composite surface complexation model, compared to the constant or single-valued Kd model, more accurately predicted U(VI) adsorption under the varying geochemical conditions expected at the IDF.

  11. Phosphorescent compositions, methods of making the compositions, and methods of using the compositions

    DOEpatents

    Jia, Weiyi; Wang, Xiaojun; Yen, William; Yen, Laurel C.; Jia, George D.

    2012-12-04

    Compositions, methods of making compositions, materials including compositions, crayons including compositions, paint including compositions, ink including compositions, waxes including compositions, polymers including compositions, vesicles including the compositions, methods of making each, and the like are disclosed.

  12. Phosphorescent compositions, methods of making the compositions, and methods of using the compositions

    DOEpatents

    Jia, Weiyi; Wang, Xiaojun; Jia, George D.; Lewis, Linda; Yen, Laurel C.

    2014-06-24

    Compositions, methods of making compositions, materials including compositions, crayons including compositions, paint including compositions, ink including compositions, waxes including compositions, polymers including compositions, vesicles including the compositions, methods of making each, and the like are disclosed.

  13. Modeling synchronized calling behavior of Japanese tree frogs

    NASA Astrophysics Data System (ADS)

    Aihara, Ikkyu

    2009-07-01

    We experimentally observed synchronized calling behavior of male Japanese tree frogs Hyla japonica; namely, while isolated single frogs called nearly periodically, a pair of interacting frogs called synchronously almost in antiphase or inphase. In this study, we propose two types of phase-oscillator models on different degrees of approximations, which can quantitatively explain the phase and frequency properties in the experiment. Moreover, it should be noted that, although the second model is obtained by fitting to the experimental data of the two synchronized states, the model can also explain the transitory dynamics in the interactive calling behavior, namely, the shift from a transient inphase state to a stable antiphase state. We also discuss the biological relevance of the estimated parameter values to calling behavior of Japanese tree frogs and the possible biological meanings of the synchronized calling behavior.

  14. Call-based species recognition in black-capped chickadees.

    PubMed

    Charrier, Isabelle; Sturdy, Christopher B

    2005-11-01

    Species recognition is essential for efficient communication between conspecifics. For this to occur, species information must be unambiguously encoded in the repertoire of each species' vocalizations. Until now, the study of species recognition in songbirds has been focused mainly on male songs and male territorial behaviour. Species recognition of other learned vocalizations, such as calls, have not been explored, and could prove useful as calls are used in a wider range of contexts. Here, we present an experimental field study investigating the coding of species information in a learned vocalization, the 'chick-a-dee' call of the black-capped chickadee (Poecile atricapillus). By modifying natural calls in both temporal and spectral domains and by observing the vocal responses of black-capped chickadees following the playback of these modified calls, we demonstrate that species recognition in chickadees relies on several acoustic features including syntax, frequency modulation, amplitude modulation, and to a lesser extent, call rhythmicity and frequency range. PMID:16139440

  15. Why do Gunnison's prairie dogs give anti-predator calls?

    Microsoft Academic Search

    JOHN L. HOOGLAND

    1996-01-01

    At a colony of Gunnison's prairie dogs, Sciuridae:Cynomys gunnisoni, containing marked individuals of known genetic relationships, anti-predator calling was investigated in response to moving, stuffed specimens of a natural predator, the American badger,Taxidea taxus. Females with kin in the home territory called more often than females without nearby kin, and females with nearby offspring were especially likely to call. Male

  16. Interindividual use of echolocation calls: Eavesdropping by bats

    Microsoft Academic Search

    Robert M. R. Barclay

    1982-01-01

    The use of other individual's echolocation calls by little brown bats, Myotis lucifugus, was tested by observing the response of free-flying bats to presentations of recorded echolocation calls and artificial sounds. Bats responded by approaching conspecific calls while searching for food, night roosts, nursery colonies and mating\\/hibernation sites. Response was low or non-existant to other sounds. While searching for prey,

  17. Dialects in the alarm calls of prairie dogs

    Microsoft Academic Search

    C. N. Slobodchikoff; R. Coast

    1980-01-01

    1.The alarm calls of the Gunnison's prairie dog, Cynomys gunnisoni zuniensis, have differentiated into local dialects.2.Call characteristics show that, within a given dialect, the number of syllables, the length of the syllables, and the interval length between syllables are weakly correlated with one another. The number of syllables, however, is strongly correlated with the total length of the call.3.Both the

  18. Interference based Call Admission Control for Wireless Ad Hoc Networks

    Microsoft Academic Search

    K. N. Sridhar; Mun Choon Chan

    2006-01-01

    In this paper, we propose a call admission control mechanism for wireless ad hoc networks called interference-based call admission control (iCAC). iCAC is unique in that it does not treat interference uniformly instead classifies interference based on estimates of the position of the interfering nodes. iCAC relies on two novel techniques: (1) estimation of position of the interfering nodes (2)

  19. Distributed call admission control in mobile\\/wireless networks

    Microsoft Academic Search

    Mahmoud Naghshineh; Mischa Schwartz

    1995-01-01

    The major focus of this paper is distributed call admission control in mobile\\/wireless networks the purpose of which is to limit the call hand-off dropping probability in loss systems or the cell overload probability in lossless systems. Hand-off dropping or cell overload are consequences of congestion in wireless networks. Our call admission control algorithm takes into consideration the number of

  20. A novel dynamic call admission control policy for wireless network

    Microsoft Academic Search

    Guo-sheng Huang; Zhi-gang Chen; Qing-hua Li; Ming Zhao; Zhen Guo

    2010-01-01

    To address the issue of resource scarcity in wireless communication, a novel dynamic call admission control scheme for wireless\\u000a mobile network was proposed. The scheme established a reward computing model of call admission of wireless cell based on Markov\\u000a decision process, dynamically optimized call admission process according to the principle of maximizing the average system\\u000a rewards. Extensive simulations were conducted

  1. A Computerized List of Journals Publishing Articles in Composition.

    ERIC Educational Resources Information Center

    Anson, Chris M.

    1986-01-01

    Cites over 70 periodicals relevant to the study and teaching of composition, intended to promote fresh professional exchange by calling attention to the many opportunities for reading and writing in the field. (HTH)

  2. Thermal-Stress Reducer For Metal/Composite Joint

    NASA Technical Reports Server (NTRS)

    Glinski, Robert L.

    1993-01-01

    Simple insert called "thermal link" reduces stresses caused by mismatches between thermal expansions of metal part and nonmetallic part made of fiber/matrix composite material. Link conceived for use in casing of advanced jet engine.

  3. St. Lawrence blue whale vocalizations revisited: characterization of calls detected from 1998 to 2001.

    PubMed

    Berchok, Catherine L; Bradley, David L; Gabrielson, Thomas B

    2006-10-01

    From 1998 to 2001, 115 h of acoustic recordings were made in the presence of the well-studied St. Lawrence population of blue whales, using a calibrated omnidirectional hydrophone [flat (+/- 3 dB) response from 5 to 800 Hz] suspended at 50 m depth from a surface isolation buoy. The primary field site for this study was the estuary region of the St. Lawrence River (Québec, Canada), with most recordings made between mid-August and late October. During the recordings, detailed field notes were taken on all cetaceans within sight. Characterization of the more than 1000 blue whale calls detected during this study revealed that the St. Lawrence repertoire is much more extensive than previously reported. Three infrasonic (<20 Hz) and three audible range (30-200 Hz) call types were detected, with much time/frequency variation seen within each type. Further variation is seen in the form of call segmentation, which appears (through examination of Lloyd's Mirror interference effects) to be controlled at least partially by the whales. Although St. Lawrence blue whale call characteristics are similar to those of the North Atlantic, comparisons of phrase composition and spacing among studies suggest the possibility of population dialects within the North Atlantic. PMID:17069329

  4. Using nurse hot line calls for disease surveillance.

    PubMed Central

    Rodman, J. S.; Frost, F.; Jakubowski, W.

    1998-01-01

    Nurse hot line calls are a potential source of public health surveillance data and may help identify epidemics of emerging infectious diseases. In this study, nurse hot line data from Milwaukee, Wisconsin, showed more than a 17-fold increase in calls for diarrhea during the 1993 Milwaukee cryptosporidiosis outbreak. Moreover, consistent patterns of seasonal variation in diarrhea- and vomiting-related calls were detected from the Baltimore, Maryland, and Albuquerque, New Mexico, hot lines. Analysis of nurse hot line calls may provide an inexpensive and timely method for improving disease surveillance. PMID:9621209

  5. Call For Contributions IEEE TRANSACTIONS ON NEURAL NETWORKS AND

    E-print Network

    Alippi, Cesare

    called concept drift ­ and to some extend domain adaptation­ algorithms, possibly in collaboration or anomaly detection in data streams · Domain adaptation · Data mining from streams of data · Architectures

  6. SYNTHESIS OF SUPERVISORS FOR TIME-VARYING DISCRETE EVENT SYSTEMS

    Microsoft Academic Search

    Eduard Montgomery; Meira Costa; Antonio Marcus; Nogueira Limay

    2004-01-01

    We introduce a time-varying automaton to model discrete event systems. The structure of this time-varying automaton is very similar structure to (max,+) automaton, but allowing variable event lifetimes. Based on this time-varying automa- ton the design of timed supervisors is obtained by using the dioid algebra, where the languages used to describe the dis- crete event system as well the

  7. STRUCTURAL DETAIL WEST END, NOTE VARYING SIZES OF TENSION MEMBERS ...

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

    STRUCTURAL DETAIL WEST END, NOTE VARYING SIZES OF TENSION MEMBERS - Sulphite Railroad Bridge, Former Boston & Maine Railroad (originally Tilton & Franklin Railroad) spanning Winnipesautee River, Franklin, Merrimack County, NH

  8. Composite material

    DOEpatents

    Hutchens, Stacy A. (Knoxville, TN); Woodward, Jonathan (Solihull, GB); Evans, Barbara R. (Oak Ridge, TN); O'Neill, Hugh M. (Knoxville, TN)

    2012-02-07

    A composite biocompatible hydrogel material includes a porous polymer matrix, the polymer matrix including a plurality of pores and providing a Young's modulus of at least 10 GPa. A calcium comprising salt is disposed in at least some of the pores. The porous polymer matrix can comprise cellulose, including bacterial cellulose. The composite can be used as a bone graft material. A method of tissue repair within the body of animals includes the steps of providing a composite biocompatible hydrogel material including a porous polymer matrix, the polymer matrix including a plurality of pores and providing a Young's modulus of at least 10 GPa, and inserting the hydrogel material into cartilage or bone tissue of an animal, wherein the hydrogel material supports cell colonization in vitro for autologous cell seeding.

  9. Photoimageable composition

    DOEpatents

    Dentinger, Paul; Krafick, Karen L.; Simison, Kelby Liv

    2005-02-22

    The use of photoacid generators including an alkoxyphenylphenyliodonium salt and/or bis(t-butylphenyl)iodonium salt in a photoimageable composition helps improve resolution. Suitable photoimageable compositions includes: (a) a multifuctional polymeric epoxy resin that is dissolved in an organic solvent wherein the epoxy resin comprises oligomers of bisphenol A that is quantitatively protected by glycidyl ether and wherein the oligomers have an average functionality that ranges from about 3 to 12; and a photoacid generator comprising an alkoxyphenylphenyliodonium salt and/or bis(t-butylphenyl)iodonium salt. Preferred alkoxyphenylphenyliodonium salts include 4-octyloxyphenyl phenyliodonium hexafluoroantimonate and 4-methoxyphenyl phenyliodonium hexafluoroantimonate. The photoimageable composition is particularly suited for producing high aspect ratio microstructures.

  10. Inferring time-varying recharge from inverse analysis of long-term water levels

    USGS Publications Warehouse

    Dickinson, J.E.; Hanson, R.T.; Ferre, T. P. A.; Leake, S.A.

    2004-01-01

    Water levels in aquifers typically vary in response to time-varying rates of recharge, suggesting the possibility of inferring time-varying recharge rates on the basis of long-term water level records. Presumably, in the southwestern United States (Arizona, Nevada, New Mexico, southern California, and southern Utah), rates of mountain front recharge to alluvial aquifers depend on variations in precipitation rates due to known climate cycles such as the El Nin??o-Southern Oscillation index and the Pacific Decadal Oscillation. This investigation examined the inverse application of a one-dimensional analytical model for periodic flow described by Lloyd R. Townley in 1995 to estimate periodic recharge variations on the basis of variations in long-term water level records using southwest aquifers as the case study. Time-varying water level records at various locations along the flow line were obtained by simulation of forward models of synthetic basins with applied sinusoidal recharge of either a single period or composite of multiple periods of length similar to known climate cycles. Periodic water level components, reconstructed using singular spectrum analysis (SSA), were used to calibrate the analytical model to estimate each recharge component. The results demonstrated that periodic recharge estimates were most accurate in basins with nearly uniform transmissivity and the accuracy of the recharge estimates depends on monitoring well location. A case study of the San Pedro Basin, Arizona, is presented as an example of calibrating the analytical model to real data.

  11. Elasticity theory equations and fracture condition for materials of varying moduli

    SciTech Connect

    Oleinikov, A.I.

    1986-11-01

    Many massive rocks and composite materials belong to the class of materials of varying moduli with definite distinct deformation and strength properties under tension and compression. The results of experiments indicate that the difference between the properties of materials of different moduli is not limited to tension and compression cases but can also appear clearly for any change in the form of the state of stress. Elasticity theory equations are constructed here to describe the strain of materials of varying moduli as well as the dependence of the strength properties on the form of the state of strain. Tests were done on coal, limestone, diabase and cement and results are shown. Using the dependencies obtained, Poisson's ratio and the elastic modulus can be calculated for these rocks. The equations and conditions of fracture proposed, are written in a simple invariant form.

  12. Microleakage resistance of minimally invasive Class I flowable composite restorations.

    PubMed

    Bonilla, Esteban D; Stevenson, Richard G; Caputo, Angelo A; White, Shane N

    2012-01-01

    Minimally invasive flowable composite Class I restorations are widely used. However, flowable composites are characterized by low filler contents, modified resin formulations, low moduli of elasticity, low viscosity, generally poor mechanical properties, and decreased long-term stability. The purpose of this study was to compare the microleakage resistance of a wide variety of flowable composites used with their manufacturers' recommended bonding systems to that of a long-used and widely studied microhybrid composite when placed as minimally invasive occlusal restorations. Molar teeth were prepared in a standardized manner, restored, artificially aged, stained, sectioned, evaluated, and analyzed. Microleakage varied substantially, by a whole order of magnitude, among the material groups tested. The control group, a conventional microhybrid composite material, leaked significantly less than all the flowable composite groups. Microleakage varied very slightly among measurement site locations. Tiny microscopic bubbles were seen within many of the flowable composite specimens, as were a few voids. PMID:22313270

  13. Fuel composition

    SciTech Connect

    Zimmerman, A.A.; Vardi, J.

    1989-03-07

    A method for reducing and/or preventing fouling in a multiport, electronically controlled fuel injection system for an internal combustion engine is described, the method comprising delivering to the fuel injection system a fuel composition comprising: gasoline; an antifouling agent; and an effective amount of a demulsifier selected from the group consisting of: i. a fatty acid aklylamine reaction product; ii. a solution of oxyalkylated alkylphenol formaldehyde resins and polyglycols; and iii. mixtures of i and ii. The patent also describes a fuel composition for reducing and/or preventing fouling in a multiport, electronically controlled fuel injection system for an internal combustion engine.

  14. Composite Riflescope

    NASA Technical Reports Server (NTRS)

    1989-01-01

    Bushnell Division of Bausch & Lomb's Armor-Sight riflescope combines the company's world-renowned optics with a graphite composite (Graphlon VI) developed for space applications. The riflescope is 10 percent lighter than aluminum scopes, and, because its thermal expansion coefficient is near zero, optical distortion from heat and cold extremes is eliminated. It is fogproof and waterproof; advanced multicoated optics provide maximum light transmission to brighten target ranges. Bushnell was assisted by NIAC/USC in searching for technical information on graphic composites and in overcoming difficulties with bonding and porosity.

  15. Lengthscale effects in the damage and failure of composites

    E-print Network

    Chambers, Jeffrey Thomas

    2014-01-01

    The primary objective of this work is to investigate and identify lengthscale effects associated with damage in composite materials and their structures, and to determine how these lengthscales vary across levels of ...

  16. Food calling in ravens: are yells referential signals?

    Microsoft Academic Search

    Thomas Bugnyar; Maartje Kijne; Kurt Kotrschal

    2001-01-01

    Ravens, Corvus corax, yell when they approach rich but defended food sources. As in other species, such food-associated calls attract conspecifics. These calls may provide information about the sender, such as its behaviour or motivation, and about the type of stimuli to which the caller is responding, such as the location, quality or quantity of a food source. We investigated

  17. 29 CFR 785.17 - On-call time.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 2010-07-01 false On-call time. 785.17 Section 785.17 Labor Regulations...HOURS WORKED Application of Principles Waiting Time § 785.17 On-call time. An employee who is required to remain on...

  18. The Multidimensionality of Calling: Conceptualization, Measurement and a Bicultural Perspective

    ERIC Educational Resources Information Center

    Hagmaier, Tamara; Abele, Andrea E.

    2012-01-01

    The experience of a calling may be seen as the ultimate form of subjective career success that has many positive consequences for individuals and organizations. We are here concerned with the conceptualization of a new multidimensional measure of calling, the MCM. In the first two studies we employed a qualitative approach and came up with five…

  19. HRM systems of Indian call centres: an exploratory study

    Microsoft Academic Search

    Pawan S. Budhwar; Arup Varma; Virender Singh; Rohin Dhar

    2006-01-01

    This paper initially highlights the rapid growth in the call centre (CC) sector in developing countries like India. It then makes a case for the investigation of human resource management (HRM) systems of call centres in India. The analysis is based on a two-phase empirical study. Phase one examines the nature and pattern of HRM systems and phase two the

  20. Heeding the Call for Change: Suggestions for Curricular Action.

    ERIC Educational Resources Information Center

    Steen, Lynn Arthur, Ed.

    The "call for change" issued by the Board of Governors of the Mathematical Association of America (MAA) in "A Call For Change: Recommendations for the Mathematical Preparation of Teachers of Mathematics, 1991" may appear at first glance to concern only the mathematical preparation of teachers. However, two ingredients combine to give it much…

  1. EMERGENCIES Only VITAL State Business Calls Are to Be Placed

    E-print Network

    being protected by contract private security companies, or those state agencies currently under contract or CentraNet phone, call 9+9-1-1. From other phones, call 9-1-1 and state: 1. I'm reporting a fire. 2. My conversation. B. Other Actions: 1. Move away from fire and smoke. Containment is vital; close doors and windows

  2. Structure of Calling and Vocation across Gender and Age Cohort

    ERIC Educational Resources Information Center

    Eldridge, Brandy M.

    2010-01-01

    The Calling and Vocation Questionnaire (CVQ) is a measure based on Dik and Duffy's (2009) theoretical conceptualization of calling, which includes three dimensions: (1) a transcendent summons, (2) deriving or expressing meaning or purpose through work, and (3) a prosocial orientation in work. Additionally, this definition posits two overarching…

  3. CALL FOR POSTERS AND DEMOS The First ACM International Workshop

    E-print Network

    Zhou, Shengli

    CALL FOR POSTERS AND DEMOS The First ACM International Workshop on Underwater Networks, Berkeley Milica Stojanovic, MIT/WHOI Poster Committee: Jun-Hong Cui, UCONN Wei Ye, USC/ISI Shengli Zhou Whitson, Boeing CALL FOR WORK-IN-PROGRESS POSTERS The work-in-progress poster session will provide a forum

  4. CALL FOR POSTERS Deadline: 06.03.2011

    E-print Network

    Moeller, Ralf

    CALL FOR POSTERS Deadline: 06.03.2011 Locality and Transnational Processes: Modalities) and Peter Geschiere (Amsterdam), a round table discussion, and a poster session. Call for Posters their projects in a poster session during the conference and to obtain feedback from the conference attendees

  5. Sustainability in CALL Learning Environments: A Systemic Functional Grammar Approach

    ERIC Educational Resources Information Center

    McDonald, Peter

    2014-01-01

    This research aims to define a sustainable resource in Computer-Assisted Language Learning (CALL). In order for a CALL resource to be sustainable it must work within existing educational curricula. This feature is a necessary prerequisite of sustainability because, despite the potential for educational change that digitalization has offered since…

  6. RESOURCE SHARING FOR BOOKAHEAD AND INSTANTANEOUSREQUEST CALLS 1

    E-print Network

    Whitt, Ward

    of interruption that we consider is similar to admission control algorithms in wireless networks, in which small, for interruption.) Thus, we propose an admission control algorithm in which a call is admitted if an approximate providers of integrated­services networks may want to allow some customers to book ahead their calls, i

  7. Thinning Schemes for Call Admission Control in Wireless Networks

    Microsoft Academic Search

    Yuguang Fang

    2003-01-01

    AbstractDIn this paper, we present new call admission control schemes, the thinning schemes, which smoothly reduce the traffic admission rates. Performance analysis is carried out and new analytical results are obtained. It demonstrates that the thinning schemes can be used to derive many known call admission control schemes.

  8. Call admission control in wireless networks: A comprehensive survey

    Microsoft Academic Search

    Mohamed Hossam Ahmed

    2005-01-01

    Radio resource management (RRM) plays a major role in Quality of Service (QoS) provisioning for wireless communication systems. The performance of RRM techniques has a direct impact on each user's individual performance and on the overall network performance. Arriving (new and handoff) calls are granted\\/denied access to the network by the call admission scheme (CAC) based on predefined criteria, taking

  9. IEEE Communications Magazine October 200072 Efficient Call Admission Control for

    E-print Network

    Shen, Xuemin "Sherman"

    admission control scheme for handling heterogeneous services in wireless ATM networks is proposed. QualityIEEE Communications Magazine · October 200072 Efficient Call Admission Control for Heterogeneous Services in Wireless Mobile ATM Networks 0163-6804/00/$10.00 © 2000 IEEE ABSTRACT An efficient call

  10. House Call Training in the Family Practice Curriculum

    ERIC Educational Resources Information Center

    Warburton, Samuel W.; Sadler, Georgia R.

    1977-01-01

    Since practicing New Jersey family physicians still consider house calls important in the delivery of quality primary care, the Department of Family Medicine of the College of Medicine and Dentistry of New Jersey-Rutgers Medical School is assisting in revising program curricula to provide house call training. (Author/LBH)

  11. 25 CFR 81.5 - Request to call election.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...authorize the calling of an election to adopt a constitution and bylaws or to revoke a constitution and bylaws, upon a request from the tribal...authorize the calling of an election to adopt a constitution and bylaws pursuant to a Federal...

  12. 25 CFR 81.5 - Request to call election.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...authorize the calling of an election to adopt a constitution and bylaws or to revoke a constitution and bylaws, upon a request from the tribal...authorize the calling of an election to adopt a constitution and bylaws pursuant to a Federal...

  13. 25 CFR 81.5 - Request to call election.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...authorize the calling of an election to adopt a constitution and bylaws or to revoke a constitution and bylaws, upon a request from the tribal...authorize the calling of an election to adopt a constitution and bylaws pursuant to a Federal...

  14. 25 CFR 81.5 - Request to call election.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...authorize the calling of an election to adopt a constitution and bylaws or to revoke a constitution and bylaws, upon a request from the tribal...authorize the calling of an election to adopt a constitution and bylaws pursuant to a Federal...

  15. 25 CFR 81.5 - Request to call election.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...authorize the calling of an election to adopt a constitution and bylaws or to revoke a constitution and bylaws, upon a request from the tribal...authorize the calling of an election to adopt a constitution and bylaws pursuant to a Federal...

  16. The After-Death Call to Family Members: Academic Perspectives

    ERIC Educational Resources Information Center

    LoboPrabhu, Sheila; Molinari, Victor; Pate, Jennifer; Lomax, James

    2008-01-01

    Objective: The authors discuss clinical and teaching aspects of a telephone call by the treating clinician to family members after a patient dies. Methods: A MEDLINE search was conducted for references to an after-death call made by the treating clinician to family members. A review of this literature is summarized. Results: A clinical application…

  17. When You Call The phone will be answered

    E-print Network

    Arizona, University of

    · Poisonous plants · Food poisoning · Pesticide information · Poisonings of animals · Workplace exposuresWhen You Call The phone will be answered · by a caring pharmacist who is a poison information...on what to do for a poisoning, bite or sting, or tips on poison-proofing your home · Call 1

  18. Why We All Need Call Waiting on Our Phones

    ERIC Educational Resources Information Center

    Higbie, Jack

    2013-01-01

    Have you ever noticed that you can go all day without a single call on your phone and then suddenly you get two calls at once? This is actually not as uncommon as it sounds and there is a mathematical reason for why we should expect it to happen, believe it or not.

  19. “Cold calling” in psychiatric follow up studies: is it justified?

    Microsoft Academic Search

    P Tyrer; H Seivewright; B Ferguson; T Johnson

    2003-01-01

    Background: The ethics of cold calling—visiting subjects at home without prior appointment agreed—in follow up research studies has received little attention although it is perceived to be quite common. We examined the ethical implications of cold calling in a study of subjects with defined neurotic disorders followed up 12 years after initial assessment carried out to determine outcome in terms

  20. CALL FOR PROPOSALS 2009 CIP ECO-INNOVATION

    E-print Network

    De Cindio, Fiorella

    CALL FOR PROPOSALS 2009 CIP ECO-INNOVATION FIRST APPLICATION AND MARKET REPLICATION PROJECTS CALL IDENTIFIER: CIP-EIP-ECO-INNOVATION-2009 CLOSING DATE: THURSDAY 10 SEPTEMBER 2009 ELECTRONIC SUBMISSION ONLY for Proposals 2009 ­ CIP Eco-innovation First Application and Market Replication Projects 2 of 15 TABLE

  1. Profiling Skype Video Calls: Rate Control and Video Quality

    E-print Network

    Liu, Yong

    to embrace the next big change: Video Telephony. Most online chatting software, such as MSN messenger, GTalkIP) calls. While the data rate of a typical Skype VoIP call is around 30kbps, as will be shown shortly about its video encoding and transmission algorithms. The common practice is to treat it as a black

  2. Evaluating a CALL Software on the Learning of English Prepositions

    ERIC Educational Resources Information Center

    Ngu, Bing Hiong; Rethinasamy, Soubakeavathi

    2006-01-01

    This study assessed the effectiveness of using a CALL lesson (Computer Assisted Language Learning) over a conventional lesson to facilitate learning of English prepositions at Bario, Malaysia. CALL was developed by the Ministry of Education, Malaysia as support material to enhance learning of English prepositions. Both the conventional and the…

  3. Call for Papers Special Issue on Camera-based

    E-print Network

    Mirmehdi, Majid

    Call for Papers Special Issue on Camera-based Text and Document Recognition Guest Editor: Dr. Majid are encouraged to submit papers which cover some of the following topics (although this list is by no means related topics... Page 1 of 2Call For Papers 06/11/03http://www.cs.bris.ac.uk/~majid/SI-IJDAR/SI-IJDAR04

  4. Enhancing Online CALL Design: The Case for Evaluation

    ERIC Educational Resources Information Center

    Hemard, Dominique

    2004-01-01

    Whilst the potential of online Computer Assisted Language Learning (CALL) in terms of access, immediacy and exposure is widely acknowledged, as yet remarkably little is known about its impact on the user population, be they language teachers or learners. Indeed, beyond its technological development, online CALL design is still affected by a dearth…

  5. Implications of Research on Human Memory for CALL Design.

    ERIC Educational Resources Information Center

    Forester, Lee

    2002-01-01

    Offers a brief overview of what is generally accepted about how human memory works as it applied to computer assisted language learning (CALL). Discusses a number of interactions from various CALL products in light of the research summarized. (Author/VWL)

  6. Teletraffic Characteristics in Prioritized Handoff Control Method Considering Reattempt Calls

    Microsoft Academic Search

    Noriteru SHINAGAWA; Takehiko KOBAYASHI; Keisuke NAKANO; Masakazu SENGOKU

    2000-01-01

    SUMMARY When a mobile station with a call in progress moves across cell boundary in a cellular mobile communications system, the system must switch the circuit to the base station in the destination cell to enable uninterrupted communications in a process called \\

  7. Reducing cross domain call overhead using batched futures

    Microsoft Academic Search

    Phillip Bogle; Barbara Liskov

    1994-01-01

    In many systems such as operating systems and databases it is important to run client code in a separate protection domain so that it cannot interfere with correct operation of the system. Clients communicate with the server by making cross domain calls, but these are expensive, often costing substantially more than running the call itself. This paper describes a new

  8. Training Mentally Retarded Adults to Make Emergency Telephone Calls

    Microsoft Academic Search

    Ritamarie Risley; Anthony J. Cuvo

    1980-01-01

    Training mentally retarded persons to make emergency telephone calls is an important community survival skill. A task analysis for making telephone calls to three emergency parties (fire, police, and doctor) was performed and its content validity established. A series of four antecedent conditions, ordered from less to more direct assistance, was used to teach all component responses to three retarded

  9. Route this form to: Human Resources Call Center

    E-print Network

    Minnesota, University of

    Route this form to: Human Resources Call Center Fax to 612-625-2979 Phone: 612-625-2016 Pay, Suite 545 HUMAN RESOURCES CALL CENTER USE ONLY Date Request Received: Processed By: Check Number of a University of Minnesota Payroll Services Pay Statement. · Mail request to University of Minnesota Human

  10. 39 CFR 6.4 - Attendance by conference telephone call.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 false Attendance by conference telephone call. 6.4 Section 6.4 Postal... § 6.4 Attendance by conference telephone call. For regularly scheduled...in a meeting of the Board by conference telephone or similar communications equipment...

  11. 39 CFR 6.4 - Attendance by conference telephone call.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false Attendance by conference telephone call. 6.4 Section 6.4 Postal... § 6.4 Attendance by conference telephone call. For regularly scheduled...in a meeting of the Board by conference telephone or similar communications equipment...

  12. 39 CFR 6.4 - Attendance by conference telephone call.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 false Attendance by conference telephone call. 6.4 Section 6.4 Postal... § 6.4 Attendance by conference telephone call. For regularly scheduled...in a meeting of the Board by conference telephone or similar communications equipment...

  13. 39 CFR 6.4 - Attendance by conference telephone call.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 false Attendance by conference telephone call. 6.4 Section 6.4 Postal... § 6.4 Attendance by conference telephone call. For regularly scheduled...in a meeting of the Board by conference telephone or similar communications equipment...

  14. 39 CFR 6.4 - Attendance by conference telephone call.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 false Attendance by conference telephone call. 6.4 Section 6.4 Postal... § 6.4 Attendance by conference telephone call. For regularly scheduled...in a meeting of the Board by conference telephone or similar communications equipment...

  15. A Reference Based Analysis Framework for Analyzing System Call Traces

    E-print Network

    Minnesota, University of

    in analyzing system call traces and show how the transformation results in improved intrusion detection performance over state of art data mining based intrusion detection methods developed for system call traces Terms Algorithms Keywords Intrusion Detection, Reference Based Analysis, Anomaly De- tection 1

  16. Antiphonal Responses to Loud Contact Calls Produced by Saguinus oedipus

    Microsoft Academic Search

    Kerry Jordan; Daniel Weiss; Marc Hauser; Bob McMurray

    2004-01-01

    We report the results of an experiment designed to investigate whether captive cotton-top tamarins (Saguinus oedipus) selectively call back to an absent cagemate. We removed 2 individuals living in separate cages (cycling through the colony so that each individual was removed 10 times) from the homeroom and played back calls produced by one of them. The caller's cagemate, residing in

  17. Analysis of Computer Intrusions Using Sequences of Function Calls

    E-print Network

    Bishop, Matt

    that have previously occurred [1]. The problem of computer forensics is not simply finding a needleAnalysis of Computer Intrusions Using Sequences of Function Calls Sean Peisert, Student Member demonstrates the value of analyzing sequences of function calls for forensic analysis. Although this approach

  18. Mentored Clinical Research Training Program (MCRTP) Call for Applications

    E-print Network

    Leistikow, Bruce N.

    Mentored Clinical Research Training Program (MCRTP) Call for Applications Deadline to submit to announce the annual call for applications for the Mentored Clinical Research Training Program (MCRTP in conducting clinical/translational research for junior investigators working to improve human health

  19. Augmented brain function by coordinated reset stimulation with slowly varying sequences

    PubMed Central

    Zeitler, Magteld; Tass, Peter A.

    2015-01-01

    Several brain disorders are characterized by abnormally strong neuronal synchrony. Coordinated Reset (CR) stimulation was developed to selectively counteract abnormal neuronal synchrony by desynchronization. For this, phase resetting stimuli are delivered to different subpopulations in a timely coordinated way. In neural networks with spike timing-dependent plasticity CR stimulation may eventually lead to an anti-kindling, i.e., an unlearning of abnormal synaptic connectivity and abnormal synchrony. The spatiotemporal sequence by which all stimulation sites are stimulated exactly once is called the stimulation site sequence, or briefly sequence. So far, in simulations, pre-clinical and clinical applications CR was applied either with fixed sequences or rapidly varying sequences (RVS). In this computational study we show that appropriate repetition of the sequence with occasional random switching to the next sequence may significantly improve the anti-kindling effect of CR. To this end, a sequence is applied many times before randomly switching to the next sequence. This new method is called SVS CR stimulation, i.e., CR with slowly varying sequences. In a neuronal network with strong short-range excitatory and weak long-range inhibitory dynamic couplings SVS CR stimulation turns out to be superior to CR stimulation with fixed sequences or RVS. PMID:25873867

  20. Chemical Composition

    Microsoft Academic Search

    Willie May; Richard Cavanagh; Gregory Turk; Michael Winchester; John Travis; Melody Smith; Paul Derose; Steven Choquette; Gary Kramer; John Sieber; Robert Greenberg; Richard Lindstrom; George Lamaze; Rolf Zeisler; Michele Schantz; Karen Phinney; Michael Welch; Thomas Vetter; Kenneth Pratt; John Scott; John Small; Scott Wight; Stephan Stranick

    2006-01-01

    Measurements of the chemical compositions of materials and the levels of certain substances in them are vital when assessing and improving public health, safety and the environment, are necessary to ensure trade equity, and are required when monitoring and improving industrial products and services. Chemical measurements play a crucial role in most areas of the economy, including healthcare, food and

  1. Architecture Composition

    E-print Network

    Raman, Bhaskaran

    : Unix piping gunzip ­­stdout file.gz | grep string1 | awk '{print $2;}' Quickly enable new functionality and fix failures quickly Performance, Load Balancing: choose least loaded service instances Scalability issues and Challenges Failure detection in the wide­area Internet Architecture for wide­area composition

  2. Transformation Composition

    E-print Network

    Drewes, Frank

    Proc. AGTIVE'99, to appear in LNCS Graph Transformation Modules and their Composition ? Frank,knirsch,kreo,kuskeg@informatik.uni-bremen.de Abstract. In this paper, we investigate the notion of transformation modules as a structuring principle. Based on the notion of transformation units, a concept that allows to specify binary relations on graphs

  3. Frequency synchronization of blue whale calls near Pioneer Seamount.

    PubMed

    Hoffman, Michael D; Garfield, Newell; Bland, Roger W

    2010-07-01

    Vocalizations of blue whales were recorded with a cabled hydrophone array at Pioneer Seamount, 50 miles off the California coast. Most calls occurred in repeated sequences of two-call pairs (A, then B). The B call is a frequency-modulated tone highly repeatable in form and pitch. A model of this sound is described which permits detecting very small frequency shifts. B calls are found to be aligned in frequency to about one part in 180. This requires very fine pitch discrimination and control over calling frequency, and suggests that synchronizing to a common frequency pattern carries some adaptive advantage. Some possibilities for acoustic sensing by whales requiring this fine frequency resolution are discussed. PMID:20649243

  4. The function of nonlinear phenomena in meerkat alarm calls

    PubMed Central

    Townsend, Simon W.; Manser, Marta B.

    2011-01-01

    Nonlinear vocal phenomena are a ubiquitous feature of human and non-human animal vocalizations. Although we understand how these complex acoustic intrusions are generated, it is not clear whether they function adaptively for the animals producing them. One explanation is that nonlinearities make calls more unpredictable, increasing behavioural responses and ultimately reducing the chances of habituation to these call types. Meerkats (Suricata suricatta) exhibit nonlinear subharmonics in their predator alarm calls. We specifically tested the ‘unpredictability hypothesis’ by playing back naturally occurring nonlinear and linear medium-urgency alarm call bouts. Results indicate that subjects responded more strongly and foraged less after hearing nonlinear alarm calls. We argue that these findings support the unpredictability hypothesis and suggest this is the first study in animals or humans to show that nonlinear vocal phenomena function adaptively. PMID:20659926

  5. Addressee Errors in ATC Communications: The Call Sign Problem

    NASA Technical Reports Server (NTRS)

    Monan, W. P.

    1983-01-01

    Communication errors involving aircraft call signs were portrayed in reports of 462 hazardous incidents voluntarily submitted to the ASRS during an approximate four-year period. These errors resulted in confusion, disorder, and uncoordinated traffic conditions and produced the following types of operational anomalies: altitude deviations, wrong-way headings, aborted takeoffs, go arounds, runway incursions, missed crossing altitude restrictions, descents toward high terrain, and traffic conflicts in flight and on the ground. Analysis of the report set resulted in identification of five categories of errors involving call signs: (1) faulty radio usage techniques, (2) call sign loss or smearing due to frequency congestion, (3) confusion resulting from similar sounding call signs, (4) airmen misses of call signs leading to failures to acknowledge or readback, and (5) controller failures regarding confirmation of acknowledgements or readbacks. These error categories are described in detail and several associated hazard mitigating measures that might be aken are considered.

  6. Computer-assisted scheduling of radiology resident call.

    PubMed

    Larson, T C; Larson, S L; Harle, T S

    1986-05-01

    The difficulties inherent in assigning an entire residency group fair and equivalent daily call prompted the development of a computerized scheduling program at The University of Texas at Houston. Written in COBOL, the program is run on a CDC mainframe computer. Logic parameters restrict the number and frequency of calls per month, and each resident is coded for five available call types at two university hospitals. The foundation of the program's operation is an arbitrary point scale applied to each call type determined by its difficulty and time commitment. Residents' point totals each month are roughly balanced within a prescribed range, with call exchanges made by the computer if necessary. The computer-generated schedules are flexible and equitable, require little manual correction, and save time for the chief resident and the residency secretary. PMID:3754853

  7. A VSS identification scheme for time-varying parameters

    Microsoft Academic Search

    Jian-Xin Xu; Ya-Jun Pan; Tong-Heng Lee

    2003-01-01

    Based on variable structure system theory and sliding mode, we develop an identification scheme suitable for time-varying parameters. The new identification scheme, working in closed-loop, addresses several key issues in system identification simultaneously: unstable process, highly nonlinear and uncertain dynamics, fast time varying parameters and rational nonlinear in the parametric space. Other important issues associated with identification, such as the

  8. Development of Linear-Parameter-Varying Models for Aircraft

    Microsoft Academic Search

    Gary J. Balas

    2004-01-01

    This paper presents a comparative study of three Linear Para meter Varying (LPV) model- ing approaches and their application to the longitudinal motion of a Boeing 747 series 100\\/200. The three approaches used to obtain the quasi-LPV models are Jacobian linearisation, state transformation, and function substitution. Development of linear parameter varying models are a key step in applying LPV control

  9. Zooplankton behavioral responses to solar UV radiation vary within and

    E-print Network

    Williamson, Craig E.

    Zooplankton behavioral responses to solar UV radiation vary within and among lakes DINA M. LEECH-B and short wavelength UV-A radiation. Columns were suspended vertically in the surface waters of a high; published online April 25, 2005 Zooplankton taxa exhibit varying tolerances to ultraviolet radiation (UVR

  10. ALGEBRAIC THEORY OF TIME-VARYING LINEAR SYSTEMS: A SURVEY

    E-print Network

    Knobloch,Jürgen

    of systems considered consists of differential-algebraic equation in kernel presentation. This class is that, since the coefficients of the differential equations are time-varying function, the differential theory over principal ideal rings. This tool proved efficient also for time-varying systems. Although

  11. Compression and Accelerated Rendering of Time-Varying Volume Data

    Microsoft Academic Search

    Kwan-Liu Ma; Han-Wei Shen

    2000-01-01

    Visualization of time-varying volumetric data sets, which may be obtained from numerical simulations or sensing instruments, pro- vides scientists insights into the detailed dynamics of the phe- nomenon under study. This paper describes our study of a coherent solution based on quantization coupled with octree and difference encoding, and adaptive rendering for efficient visualization of time- varying volumetric data. Quantization

  12. ORTHOGONAL EMBEDDING THEORY FOR CONTRACTIVE TIME-VARYING SYSTEMS

    E-print Network

    van der Veen, Alle-Jan

    ORTHOGONAL EMBEDDING THEORY FOR CONTRACTIVE TIME-VARYING SYSTEMS A.-J. van der Veen and P of a given (strictly) contractive time-varying system as the partial transfer operator of a lossless system, we will solve the lossless embedding problem (Darlington problem [1, 2]) for strictly contractive

  13. Annual maxima and totals of seasonally varying processes

    Microsoft Academic Search

    K. J. A. Revfeim

    1991-01-01

    The solar cycle induces strong periodicity in processes underlying monthly rainfall totals. Seasonally varying parameters of rainfall distributions can be estimated with reasonable reliability from relatively few years of monthly data. The distribution of annual totals or maxima in terms of these varying parameters can thus be used to predict long term annual characteristics from quite short records. Specification of

  14. How Do Parenting Concepts Vary within and between the Families?

    ERIC Educational Resources Information Center

    Roskam, Isabelle; Meunier, Jean Christophe

    2009-01-01

    How do parenting concepts vary within and between the families? The present study regards parenting as a complex family process by considering three concepts of parenting: styles, differential treatment and coparenting consistency. A main question was addressed: whether and how these parenting concepts vary within the families towards siblings or…

  15. Low frequency waves in plasmas with spatially varying electron temperature

    E-print Network

    Paris-Sud XI, Université de

    Low frequency waves in plasmas with spatially varying electron temperature P. Guio1,* , S. Bùrve2 frequency electrostatic waves are studied in magnetized plasmas with an electron temperature which varies with position in a direction perpendicular to the magnetic ®eld. For wave frequencies below the ion cyclotron

  16. Influence of Fiber Surface Treatment on Mechanical Properties of CF\\/ PET Composites

    Microsoft Academic Search

    Pinpin Shi; Wei Wu; Yu Chen; Mingchang Liu; Yong Liu; Xiang Wu

    2011-01-01

    Carbon fiber (CF) \\/ poly (ethylene terephthalate) (PET) composites were prepared with various contents (2-15wt%) of short carbon fibers. To investigate the effect of surface treatment of the CF on the mechanical properties of the composites, three specimens were prepared; those with short carbon fibers (called SCF), short carbon fibers oxidized with nitric acid (called NASCF) and the fibers oxidized

  17. Influence of Fiber Surface Treatment on Mechanical Properties of CF\\/PET Composites

    Microsoft Academic Search

    Pinpin Shi; Wei Wu; Yu Chen; Mingchang Liu; Yong Liu; Xiang Wu

    2012-01-01

    Carbon fiber (CF) \\/ poly (ethylene terephthalate) (PET) composites were prepared with various contents (2–15wt%) of short carbon fibers. To investigate the effect of surface treatment of the CF on the mechanical properties of the composites, three specimens were prepared; those with short carbon fibers (called SCF), short carbon fibers oxidized with nitric acid (called NASCF) and the fibers oxidized

  18. Watching how composites grow

    SciTech Connect

    Ashley, S.

    1993-07-01

    This article reports on a powerful x-ray analysis technique that has been developed to let researchers see, in three dimensions and microscopic detail, inside a ceramic composite as it is forming. The high-resolution imaging technique, called X-ray tomographic microscopy (XTM), is similar to medical computed tomography (CT) in which physicians take X-ray images of a patient's body from different angles and then reconstruct the data computationally into three-dimensional pictures of organs. The new method appears to have significant application in fields ranging from materials science to medical bone studies of osteoporosis--situations in which investigators need to visualize the microscopic behavior of complex materials.

  19. Time varying voltage combustion control and diagnostics sensor

    DOEpatents

    Chorpening, Benjamin T. (Morgantown, WV); Thornton, Jimmy D. (Morgantown, WV); Huckaby, E. David (Morgantown, WV); Fincham, William (Fairmont, WV)

    2011-04-19

    A time-varying voltage is applied to an electrode, or a pair of electrodes, of a sensor installed in a fuel nozzle disposed adjacent the combustion zone of a continuous combustion system, such as of the gas turbine engine type. The time-varying voltage induces a time-varying current in the flame which is measured and used to determine flame capacitance using AC electrical circuit analysis. Flame capacitance is used to accurately determine the position of the flame from the sensor and the fuel/air ratio. The fuel and/or air flow rate (s) is/are then adjusted to provide reduced flame instability problems such as flashback, combustion dynamics and lean blowout, as well as reduced emissions. The time-varying voltage may be an alternating voltage and the time-varying current may be an alternating current.

  20. Acoustic communication in the Kittiwake Rissa tridactyla : potential cues for sexual and individual signatures in long calls

    Microsoft Academic Search

    Thierry Aubin; Nicolas Mathevon; Vincent Staszewski; Thierry Boulinier

    2007-01-01

    Sex and individual recognition systems vary among species and can have various functions in different contexts. In order to\\u000a determine the basis of identification by voice in the Kittiwake (Rissa tridactyla), the greeting calls of 32 individuals (18 males and 14 females) were recorded in May–June 2004 on the Kittiwake colony of\\u000a Hornøya island (Barents sea) and analysed. On the