1,975 research outputs found

    Work of the Ceramic Experiment Station of the U. S. Bureau of Mines

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    Life After Sentence of Death: What Becomes of Individuals Under Sentence of Death After Capital Punishment Legislation is Repealed or Invalidated

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    More than 2500 individuals are now under sentence of death in the United States. At the same time, multiple indicators—public opinion polls, legislative repeal and judicial invalidation of deathpenalty laws, the reduction in new death sentences, and infrequency of executions—suggest that support for capital punishment has significantly eroded. As jurisdictions abandon or consider eliminating the death-penalty, the fate of prisoners on death row—whether their death sentences, valid when imposed, should be carried out or whether these individuals should instead be spared execution—looms as contentious political and legal issues, fraught with complex philosophical, penological, and constitutional questions. This article presents a detailed account of what has happened historically to persons awaiting execution, principally within the United States but also internationally, at the time capital-punishment legislation is repealed or invalidated (either completely, or with respect to a narrow category of crimes or persons). Our analysis has uncovered no instances of executions being carried out under those circumstances. This finding has important policy implications and is directly relevant to the Supreme Court’s Eighth Amendment jurisprudence, which relies on execution practices as one measure to help inform the Court about whether the death penalty is a cruel and unusual punishment

    First-principles investigation of Ag-Cu alloy surfaces in an oxidizing environment

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    In this paper we investigate by means of first-principles density functional theory calculations the (111) surface of the Ag-Cu alloy under varying conditions of pressure of the surrounding oxygen atmosphere and temperature. This alloy has been recently proposed as a catalyst with improved selectivity for ethylene epoxidation with respect to pure silver, the catalyst commonly used in industrial applications. Here we show that the presence of oxygen leads to copper segregation to the surface. Considering the surface free energy as a function of the surface composition, we construct the convex hull to investigate the stability of various surface structures. By including the dependence of the free surface energy on the oxygen chemical potential, we are able compute the phase diagram of the alloy as a function of temperature, pressure and surface composition. We find that, at temperature and pressure typically used in ethylene epoxidation, a number of structures can be present on the surface of the alloy, including clean Ag(111), thin layers of copper oxide and thick oxide-like structures. These results are consistent with, and help explain, recent experimental results.Comment: 10 pages, 6 figure

    Electron attachment to SF6 and lifetimes of SF6- negative ions

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    We study the process of low-energy electron capture by the SF6 molecule. Our approach is based on the model of Gauyacq and Herzenberg [J. Phys. B 17, 1155 (1984)] in which the electron motion is coupled to the fully symmetric vibrational mode through a weakly bound or virtual s state. By tuning the two free parameters of the model, we achieve an accurate description of the measured electron attachment cross section and good agreement with vibrational excitation cross sections of the fully symmetric mode. An extension of the model provides a limit on the characteristic time of intramolecular vibrational relaxation in highly-excited SF6-. By evaluating the total vibrational spectrum density of SF6-, we estimate the widths of the vibrational Feshbach resonances of the long-lived negative ion. We also analyse the possible distribution of the widths and its effect on the lifetime measurements, and investigate nonexponential decay features in metastable SF6-.Comment: 22 pages, 10 figures, submitted to Phys. Rev.

    Stochastic analysis of surface roughness

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    For the characterization of surface height profiles we present a new stochastic approach which is based on the theory of Markov processes. With this analysis we achieve a characterization of the complexity of the surface roughness by means of a Fokker-Planck or Langevin equation, providing the complete stochastic information of multiscale joint probabilities. The method was applied to different road surface profiles which were measured with high resolution. Evidence of Markov properties is shown. Estimations for the parameters of the Fokker-Planck equation are based on pure, parameter free data analysis

    A Tide of Technical Trends: Technology Competence Among Licensed Counselors

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    The inclusion of technology in mental health care can revolutionize the accessibility, affordability, and effectiveness of counseling services, while furnishing practical solutions to reduce mental health disparities and meet widening care demands. Steered by the Coalition for Technology in Behavioral Science (CTiBS) telebehavioral health (TBH) competencies, this study employed a descriptive survey design to investigate licensed counselors’ (LCs’) perceived technology competence in mental health care. The following research question steered the study’s exploration: What is the nature of perceived technology competence among LCs? The overarching hypothesis speculated that LCs’ exposure, familiarity, and current utilization of various mental health technologies would impact their perceived competence to integrate technology into their clinical work with clients. A total of 153 respondents completed all survey items. Through descriptive and chi-square analyses, the results illuminated LCs’ perceived technological proficiency. Implications and future study recommendations are detailed

    Transcriptomic analysis of milk somatic cells in mastitis resistant and susceptible sheep upon challenge with Staphylococcus epidermidis and Staphylococcus aureus

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    <p>Abstract</p> <p>Background</p> <p>The existence of a genetic basis for host responses to bacterial intramammary infections has been widely documented, but the underlying mechanisms and the genes are still largely unknown. Previously, two divergent lines of sheep selected for high/low milk somatic cell scores have been shown to be respectively susceptible and resistant to intramammary infections by <it>Staphylococcus spp</it>. Transcriptional profiling with an 15K ovine-specific microarray of the milk somatic cells of susceptible and resistant sheep infected successively by <it>S. epidermidis </it>and <it>S. aureus </it>was performed in order to enhance our understanding of the molecular and cellular events associated with mastitis resistance.</p> <p>Results</p> <p>The bacteriological titre was lower in the resistant than in the susceptible animals in the 48 hours following inoculation, although milk somatic cell concentration was similar. Gene expression was analysed in milk somatic cells, mainly represented by neutrophils, collected 12 hours post-challenge. A high number of differentially expressed genes between the two challenges indicated that more T cells are recruited upon inoculation by <it>S. aureus </it>than <it>S. epidermidis</it>. A total of 52 genes were significantly differentially expressed between the resistant and susceptible animals. Further Gene Ontology analysis indicated that differentially expressed genes were associated with immune and inflammatory responses, leukocyte adhesion, cell migration, and signal transduction. Close biological relationships could be established between most genes using gene network analysis. Furthermore, gene expression suggests that the cell turn-over, as a consequence of apoptosis/granulopoiesis, may be enhanced in the resistant line when compared to the susceptible line.</p> <p>Conclusions</p> <p>Gene profiling in resistant and susceptible lines has provided good candidates for mapping the biological pathways and genes underlying genetically determined resistance and susceptibility towards <it>Staphylococcus </it>infections, and opens new fields for further investigation.</p

    Recent Research on the Health Benefits of Blueberries and Their Anthocyanins

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    Awareness of the human health benefits of blueberries is underpinned by a growing body of positive scientific evidence from human observational and clinical research, plus mechanistic research using animal and in vitro models. Blueberries contain a large number of phytochemicals, including abundant anthocyanin pigments. Of their various phytochemicals, anthocyanins probably make the greatest impact on blueberry health functionality. Epidemiological studies associate regular, moderate intake of blueberries and/or anthocyanins with reduced risk of cardiovascular disease, death, and type 2 diabetes, and with improved weight maintenance and neuroprotection. These findings are supported by biomarker-based evidence from human clinical studies. Among the more important healthful aspects of blueberries are their anti-inflammatory and antioxidant actions and their beneficial effects on vascular and glucoregulatory function. Blueberry phytochemicals may affect gastrointestinal microflora and contribute to host health. These aspects have implications in degenerative diseases and conditions as well as the aging process. More evidence, and particularly human clinical evidence, is needed to better understand the potential for anthocyanin-rich blueberries to benefit public health. However, it is widely agreed that the regular consumption of tasty, ripe blueberries can be unconditionally recommended
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