13,388 research outputs found

    Cryogenic Propellant Scavenging

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    A detailed description of a computer model that has been developed for assessing the feasibility of low g cryogen propellant scavenging from the space shuttle External Tank (ET) is given. Either pump-assisted or pressure-induced propellant transfer may be selected. The program will accept a wide range of input variables, including the fuel to be transferred (LOX or LH2), heat leaks, tank temperatures, and piping and equipment specifications. The model has been parametrically analyzed to determine initial design specification for the system

    Lake sedimentological and ecological response to hyperthermals : Boltysh impact crater, Ukraine

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    Acknowledgements Initial drilling of the Boltysh meteorite crater was funded by Natural Environment Research Council (NERC) grant NE/D005043/1. The authors are extremely grateful to the valuable scientific contributions of S. Kelley and I. Gilmour. The constructive and critical reviews by M. Schuster and an anonymous reviewer greatly helped to improve this manuscript.Peer reviewedPostprin

    Continuous-wave Raman laser pumped within a semiconductor disk laser cavity

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    A KGd(WO4)(2) Raman laser was pumped within the cavity of a cw diode-pumped InGaAs semiconductor disk laser (SDL). The Raman laser threshold was reached for 5: 6W of absorbed diode pump power, and output power up to 0.8W at 1143nm, with optical conversion efficiency of 7.5% with respect to the absorbed diode pump power, was demonstrated. Tuning the SDL resulted in tuning of the Raman laser output between 1133 and 1157nm

    Bridging the gap between ethnically/culturally diverse \u27others\u27: A contribution to the understanding of how women work together

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    In this thesis, I explore the ways in which ethnically and culturally diverse women work together to rbedige their differences. Using a critical, feminist, reflexive and post-colonialist approach, I conducted eight in-person, semi-structured interviews with women who were staff and board members, volunteers, or participants in programmes offered by an organization serving immigrant women. Wommen were asked to name their cultural or ethnic identities, to share their views on multiculturalism, tolerance, and the “welcoming” of newcomers to Canada, the uniting and divisive issues they faced in their work, as well as appropriate roles for Canadian-born and immigrant women in the organization at which they work. According to my interviews with women and the organizational data, one of the main features of women’s work together has been their attempt to “fit in.” In the context of this particular organization, “fitting in” meant that women emphasized commonalities and swerved away from critical and political analyses, particularly around notions of colour, power and privilege. In addition, women within this organization adopted mainstream society’s “liberal’ view of multiculturalism, which celebrated women’s diversity, but did not make room for a deeper understanding of the differences between individuals from diverse cultural, ethnic, and racial groups. As such, ethnically and culturally diverse women tended to work together as “Canadians,” and swept aside their differences or challenges. Women’s responses to the questions regarding the “how” of their work together were impacted by their skin colour (visible minority vs. white) and experience with immigration (Canadian-born vs. immigrant to Canada). Colour was a salient predictor of women’s experiences, as visible minority women (regardless of their country of birth) were more forthcoming about their views on multiculturalism, tolerance, and the roles women should play within the organization. Generally, all participants were quite uncomfortable with critical language around colour, power and privilege, which was understandable given the organization’s downplaying of “political” issues, and our larger society’s avoidance of issues of power and privilege. To account for some of the “gaps” in communication between ethnically and culturally diverse women, I discuss the utility of an anti-oppressive framework and the abandonment of critical language (without a rejection of the underlying critical approach) in order to “build bridges” between diverse women working together in Canada

    Physiological studies on hard ticks Ixodidae

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    Perspectives on subnational carbon and climate footprints: A case study of Southampton, UK

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    Sub-national governments are increasingly interested in local-level climate change management. Carbon- (CO2 and CH4) and climate-footprints—(Kyoto Basket GHGs) (effectively single impact category LCA metrics, for global warming potential) provide an opportunity to develop models to facilitate effective mitigation. Three approaches are available for the footprinting of sub-national communities. Territorial-based approaches, which focus on production emissions within the geo-political boundaries, are useful for highlighting local emission sources but do not reflect the transboundary nature of sub-national community infrastructures. Transboundary approaches, which extend territorial footprints through the inclusion of key cross boundary flows of materials and energy, are more representative of community structures and processes but there are concerns regarding comparability between studies. The third option, consumption-based, considers global GHG emissions that result from final consumption (households, governments, and investment). Using a case study of Southampton, UK, this chapter develops the data and methods required for a sub-national territorial, transboundary, and consumption-based carbon and climate footprints. The results and implication of each footprinting perspective are discussed in the context of emerging international standards. The study clearly shows that the carbon footprint (CO2 and CH4 only) offers a low-cost, low-data, universal metric of anthropogenic GHG emission and subsequent management

    The optical polarization of Epsilon Aurigae through the 1982-84 eclipse

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    About 350 nights observations on the 61-cm telescope at Pine Mt. Observatory were made of the variable polarization of Eps. Aurigae during 1982-85, in the U, B, and V color bands. The V data are the most complete and are shown. In terms of the overall features the curves in all three colors are quite similar. The typical errors per nightly point in the V curves are about 0.015% for either of the two normalized, equatorial Stokes parameters Q and U. Note that there is a large background or constant component of some 2.5%, position angle around 135 deg. This is presumably largely interstellar, and the intrinsic polarization probably does not much exceed the amplitude of the variable component, approx. 0.5%. A few field-star polarizations were measured but a very clear pattern was not obtained in this part of the sky
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