22,624 research outputs found

    Identifying the Burdens and Opportunities for Tribes and Communities in Federal Facility Cleanup Activities: Environmental Remediation Technology Assessment Matrix For Tribal and Community Decision-Makers

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    The cleanup of this country's federal facilities can affect a wide range of tribal and community interests and concerns. The technologies now in use, or being proposed by the Department of Energy, Department of Defense and other federal agencies can affect tribal treaty protected fishing, hunting and other rights, affect air and water quality thereby requiring the tribe to bear the burden of increased environmental regulation. The International Institute for Indigenous Resource Management developed a tribal and community decision-maker's Environmental Remediation Technology Assessment Matrix that will permit tribes and communities to array technical information about environmental remediation technologies against a backdrop of tribal and community environmental, health and safety, cultural, religious, treaty and other concerns and interests. Ultimately, the matrix will allow tribes and communities to assess the impact of proposed technologies on the wide range of tribal and community interests and will promote more informed participation in federal facility cleanup activities

    Gravitational Wave Bursts from Collisions of Primordial Black Holes in Clusters

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    The rate of gravitational wave bursts from the mergers of massive primordial black holes in clusters is calculated. Such clusters of black holes can be formed through phase transitions in the early Universe. The central black holes in clusters can serve as the seeds of supermassive black holes in galactic nuclei. The expected burst detection rate by the LISA gravitational wave detector is estimated.Comment: 10 pages, 2 figure

    Spatial Degrees of Freedom in Everett Quantum Mechanics

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    Stapp claims that, when spatial degrees of freedom are taken into account, Everett quantum mechanics is ambiguous due to a "core basis problem." To examine an aspect of this claim I generalize the ideal measurement model to include translational degrees of freedom for both the measured system and the measuring apparatus. Analysis of this generalized model using the Everett interpretation in the Heisenberg picture shows that it makes unambiguous predictions for the possible results of measurements and their respective probabilities. The presence of translational degrees of freedom for the measuring apparatus affects the probabilities of measurement outcomes in the same way that a mixed state for the measured system would. Examination of a measurement scenario involving several observers illustrates the consistency of the model with perceived spatial localization of the measuring apparatus.Comment: 34 pp., no figs. Introduction, discussion revised. Material tangential to main point remove

    Polar orbit electrostatic charging of objects in shuttle wake

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    A survey of DMSP data has uncovered several cases where precipitating auroral electron fluxes are both sufficiently intense and energetic to charge spacecraft materials such as teflon to very large potentials in the absence of ambient ion currents. Analytical bounds are provided which show that these measured environments can cause surface potentials in excess of several hundred volts to develop on objects in the orbiter wake for particular vehicle orientations

    Galaxies Probing Galaxies in PRIMUS - I. Sample, Spectroscopy, and Characteristics of the z~0.5 MgII-Absorbing Circumgalactic Medium

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    Spectroscopy of background QSO sightlines passing close to foreground galaxies is a potent technique for studying the circumgalactic medium (CGM). QSOs are effectively point sources, however, limiting their potential to constrain the size of circumgalactic gaseous structures. Here we present the first large Keck/LRIS and VLT/FORS2 spectroscopic survey of bright (B_AB < 22.3) background galaxies whose lines of sight probe MgII 2796, 2803 absorption from the CGM around close projected foreground galaxies at transverse distances 10 kpc < R_perp < 150 kpc. Our sample of 72 projected pairs, drawn from the PRIsm MUlti-object Survey (PRIMUS), includes 48 background galaxies which do not host bright AGN, and both star-forming and quiescent foreground galaxies with stellar masses 9.0 < log M_*/M_sun < 11.2 at redshifts 0.35 < z_f/g < 0.8. We detect MgII absorption associated with these foreground galaxies with equivalent widths 0.25 Ang 2sigma significance in 20 individual background sightlines passing within R_perp < 50 kpc, and place 2sigma upper limits on W_2796 of <0.5 Ang in an additional 11 close sightlines. Within R_perp < 50 kpc, W_2796 is anticorrelated with R_perp, consistent with analyses of MgII absorption detected along background QSO sightlines. Subsamples of these foreground hosts divided at log M_*/M_sun = 9.9 exhibit statistically inconsistent W_2796 distributions at 30 kpc < R_perp < 50 kpc, with the higher-M_* galaxies yielding a larger median W_2796 by 0.9 Ang. Finally, we demonstrate that foreground galaxies with similar stellar masses exhibit the same median W_2796 at a given R_perp to within <0.2 Ang toward both background galaxies and toward QSO sightlines drawn from the literature. Analysis of these datasets constraining the spatial coherence scale of circumgalactic MgII absorption is presented in a companion paper.Comment: 36 pages, 18 figures, 5 tables. Accepted to Ap

    Perspectives of Title IX Pioneers: Equity, Equality and Need

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    The purpose of the study was to analyze the perspectives of Title IX trailblazers noting changes over a 40-year span as identified by participating Mountain West Conference athletic departments. Questions posed to participants focused on Title IX’s impact on participants, their personal contributions to gender equity, and how athletic departments have committed to gender equity over the past 40 years by supporting opportunities for women in athletics. Participants were recruited directly by their respective MWC school, and agreed to be videotaped for a MWC production shared publicly and submitted for a national competition. Video recordings were transcribed and analyzed. From the transcripts a coding system was developed to identify themes and concepts. Coding was undertaken through comparative analysis and in line with the two part process identified by Charmaz (2006). The data were evaluated using the theoretical framework of distributive justice to view women’s experiences in intercollegiate athletics over the 40 year period of Title IX implementation (Mahony & Pastore, 1998). This theoretical grounding was used to illuminate ways in which resource decisions are made which often disadvantage women, and to examine the perceptions of fairness based on equity, equality and need (Mahony & Pastore, 1998) within athletic departments. The integration of the distributive justice framework in the data analysis illuminates the power differentials as well as the challenges women have faced in intercollegiate athletics directly attributable to Title IX. Analysis of the videos compiled revealed three primary themes, 1) Eras / generational differences, 2) Fighting for resources, and 3) Leadership and life skills development, along with several subthemes. Discussion of key themes and the resulting implications are presented.Citation: Rubin, L.M., & Lough, N. (2015). Perspectives of title IX pioneers: Equity, equality and need. Journal of Intercollegiate Sport, 8, 109-130. doi:10.1123/jis.2014-0114
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