1,289 research outputs found

    Photovoltaic power systems workshop

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    Discussions are presented on apparent deficiencies in NASA planning and technology development relating to a standard power module (25-35 kW) and to future photovoltaic power systems in general. Topics of discussion consider the following: (1) adequate studies on power systems; (2) whether a standard power system module should be developed from a standard spacecraft; (3) identification of proper approaches to cost reduction; (4) energy storage avoidance; (5) attitude control; (6) thermal effects of heat rejection on solar array configuration stability; (7) assembly of large power systems in space; and (8) factoring terrestrial photovoltaic work into space power systems for possible payoff

    Threatened species and their recovery: the challenges or the art of intelligent tinkering

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    David Given starts by telling three stories of rare and endangered plants three stories which embody parabolic truth

    Five Collections of Cumacea from the Alaskan Arctic

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    Lists, with detailed morphologic and taxonomic information, several species of these crustaceans collected 1948-1950 by various parties. The latter, working in the area described, with pertinent station data and species recovered. Some taxonomically significant variations are noted among the species listed, also some range extensions

    Psychometric Development and Validation of the Zahn-Given Recovery Beliefs Questionnaire in an Adult Psychiatric Sample

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    The purpose of this study was to develop and validate the Zahn-Given Recovery Beliefs Questionnaire (RBQ). The RBQ is a formal measure designed to assess specific underlying beliefs and expectations that relate to treatment non-adherence and recidivism in adult psychiatric patients. A total of 100 subjects were administered the RBQ, the Beck Hopelessness Scale (BHS), the Dysfunctional Attitudes Scale (DAS); included as well are self and clinician-rated compliance with treatment measures. Factor analysis of the RBQ reveals a factor structure that includes four factors: Embarrassment/ Stigma, Unrealistic Optimism, Hopelessness/ Pessimism and Concerns About Side Effects. A total scale alpha reliability of .82 indicates stability of the instrument. The RBQ demonstrates construct validity as evidenced by positive correlations with the BHS and DAS, which also measure distorted styles of thinking. Furthermore, the Pessimism/ Hopelessness factor of the RBQ correlates positively with the BHS. Recidivists (n = 31) did not significantly differ from non-recidivists (n = 69) on total RBQ score, although non-recidivists endorsed more concerns related to the use of psychiatric medications as measured by the Concerns About Side Effects Factor of the RBQ. Treatment implications and recommendations for future research are discussed

    Computer-aided detection (CAD): the case against

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