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71.
A method for the routine profiling of illicit heroin samples received in casework has been developed which depends on simple and straightforward sample pretreatment, followed by gas chromatography on a capillary column using flame-ionization detection. The factors affecting the choice of each aspect of the procedure are discussed, as are the statistical data for sampling and the chromatography. Components of illicit heroin derived from opium and other adulterants have been identified. The significance of data from samples examined in 1986 is discussed. 相似文献
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AbstractWe contribute to the debate on the spatial allocation of infrastructure investments by examining where these investments generate the highest economic return (‘spatial efficiency’), and identifying trade-offs when infrastructure coverage is made more equitable across regions (‘spatial equity’). We estimate models of firm location choice in Uganda, drawing on insights from the new economic geography literature. The main findings show that manufacturing firms gain from being in areas that offer a diverse mix of economic activities. Public infrastructure investments in other locations are likely to attract fewer private investors, and will pose a spatial efficiency–equity trade-off. 相似文献
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Susanne V. Knudsen 《Nora, Nordic Journal of Women's Studies》2013,21(2):102-112
Gender awareness and gender neutrality are discussed with the aid of post‐structuralist gender theories concerning paradoxes and aporias. Via paradox thinking, women's, men's and gender studies are challenged to develop perspectives on gender that are both thought and not thought, said and not said, done and not done. Paradoxes are understood as aporias, in which the researcher gets into “stuck places”. Gender dualism is put to the test as a fundamental concept. Various theories of power, such as patriarchy theories, theories of hegemonic power, and gender and queer‐theories of symbolic and discursive power are associated with gender paradoxes and gender dualism. Examples are included from the author's own research in school and gender studies. 相似文献
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This study seeks to explain why U.S. local governments utilize environmental sustainability to promote economic development. Economic development and environmental protection need not be competing objectives, but rather, environmental protection can enhance local economic competitiveness. Using data from the ICMA Economic Development Survey, this study tests an empirical model that includes state sustainability initiatives, participation in climate protection networks, and political attitudes toward economic development as predictors of local policy decisions. The findings reinforce a multi-level governance perspective on explaining the balance cities seek to achieve between environmental protection and economic growth. 相似文献
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Levey Emma K. V. Garandeau Claire F. Meeus Wim Branje Susan 《Journal of youth and adolescence》2019,48(6):1068-1081
Journal of Youth and Adolescence - Adolescence tends to be characterized by a temporary peak in delinquent behavior, and friends in particular play a key role in the initiation and the development... 相似文献