5,477 research outputs found

    A longitudinal study of website accessibility: Have social work education websites become more accessible?

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    This study (N = 45 schools) sought to determine the accessibility of baccalaureate social work program websites in 2003 and 2008 using Priority 1 checkpoints from the World Wide Web Consortium (W3C) 1.0 guidelines. Paired t-test results indicate that the mean accessibility scores of five of the nine items (plus the website accessibility scale as a whole) was statistically higher after five years. However, 75.6% of programs still had one or more Priority 1 accessibility barriers in 2008 and thus did not meet the lowest W3C accessibility guidelines. This highlights the need for more education about barriers to accessibility and methods for making websites more accessible

    Observation of enhanced rate coefficients in the H2+_2^+ + H2_2 \rightarrow H3+_3^+ + H reaction at low collision energies

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    The energy dependence of the rate coefficient of the H2+ +H2H3++H_2^+\ + {\rm H}_2 \rightarrow {\rm H}_3^+ + {\rm H} reaction has been measured in the range of collision energies between kB10k_\mathrm{B}\cdot 10 K and kB300k_\mathrm{B}\cdot 300 mK. A clear deviation of the rate coefficient from the value expected on the basis of the classical Langevin-capture behavior has been observed at collision energies below kB1k_\mathrm{B}\cdot 1 K, which is attributed to the joint effects of the ion-quadrupole and Coriolis interactions in collisions involving ortho-H2_2 molecules in the j=1j = 1 rotational level, which make up 75% of the population of the neutral H2_2 molecules in the experiments. The experimental results are compared to very recent predictions by Dashevskaya, Litvin, Nikitin and Troe (J. Chem. Phys., in press), with which they are in agreement.Comment: 14 pages, 3 figure

    The Lemaitre-Schwarzschild Problem Revisited

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    The Lemaitre and Schwarzschild analytical solutions for a relativistic spherical body of constant density are linked together through the use of the Weyl quadratic invariant. The critical radius for gravitational collapse of an incompressible fluid is shown to vary continuously from 9/8 of the Schwarzschild radius to the Schwarzschild radius itself while the internal pressures become locally anisotropic.Comment: Final version as accepted by GR&G (to appear in vol. 34, september 2002

    MICROGRID MODELING ASSESSMENT FOR CLIMATE TRENDS AND WEATHER EVENTS

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    This report performs a gap analysis on microgrid models with respect to climate change risks at Naval installations. Six climate change risks are identified for the model analysis including drought, flooding, heat, cold, wildfires, and weather extremes. Each climate change risk is decomposed into ordered effects that inform the impacts that the climate risks may have on microgrids. The climate change risks, ordered effects, and the impacts on microgrids are used to analyze three microgrid models to determine if they adequately incorporate the six climate risks. A model analysis framework is developed to identify gaps in the approach of the models, the input parameters of the models, and the assumptions made in the models. The analysis demonstrates that gaps exist in each model when considering the climate change risks, the ordered effects, and the impacts to the microgrid. These gaps exist in all three models analyzed using the model analysis framework. The identified gaps are used to develop recommendations for ways to improve the incorporation of the climate change risks into microgrid models and the necessary research required to inform that data used in microgrid models.Naval Facilities Engineering CommandCivilian, Department of the NavyCivilian, Department of the NavyCivilian, Department of the NavyCivilian, Department of the NavyApproved for public release. Distribution is unlimited

    Reducing the burden of obesity-associated cancers with anti-inflammatory long-chain omega-3 polyunsaturated fatty acids

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    Today’s world population has an unprecedented risk of dying from the consequences of being overweight and obese. Chronic diseases such as cardiovascular disease, type 2 diabetes, and cancer are often accelerated because of excessive adiposity. Various biological mechanisms are implicated in the obesity-cancer link, particularly local and systemic inflammation as well as altered growth factor signaling pathways. In order to combat obesity-induced inflammation and the resulting increases in cancer risk and progression, the identification of safe and effective mechanism-based interventions is imperative. Notably, long chain omega-3 polyunsaturated fatty acids (PUFAs) modulate the secretion of pro-inflammatory cytokines, prostaglandins and other inflammatory mediators, restore insulin sensitivity, and can prevent or delay tumorigenesis. Delineating the precise mechanisms by which omega-3 PUFAs suppress obesity-induced inflammation will help identify promising key mechanistic targets and intervention strategies to break the obesity-cancer link
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