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GJ Schick  JW Stroup 《Omega》1981,9(4):389-396
The fleet planning problem requires determination of the changing airline fleet mix based on existing traffic levels and projected growth, on the existing fleet, various aircraft types available in the future, and other operational and financial considerations. Several applicable mathematical formulations have been reported. One of these has been programmed for the computer and used by the authors for several years. This paper discusses the application of that model to real airline planning situations. Such practical experience has effected changes in the program and the manner it is used in fleet planning studies.  相似文献   
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This essay concerns recent positions on homosexuality taken by the Roman Catholic Church and places them with respect to historical documents engaging same-sex desire. Analyzing Aelred of Rievaulx's twelfth-century Spiritual Friendship, John Bloxam's 1894 The Priest and the Acolyte, and Marc-André Raffalovich's 1896 Uranisme et Unisexualité, this essay offers perspectives on contemporary lay and ecclesiastical apologias, defenses, and critiques of homosexual behavior. The relationship between past and present locates the Christian churches' response to the modern homosexual as a historically developed—rather than permanently fixed—model of identity and action.  相似文献   
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This essay locates Judith Butler's Gender Trouble: Feminism and the Subversion of Identity with respect to the historical moment of its publication in 1990 and its influence on the evolution of gender studies and queer theory in the 1990s. It also discusses Butler's place in feminism and feminist theory, and interrogates the relationship between popular culture, activism, and work in the academy.  相似文献   
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In their books The Assessment of Social Research and Exemplars of Social Research, Fellin, Tripodi and Meyer develop, describe and discuss a method for classifying and assessing social research. They state that “this classification system is intended for use with empirical research reports, and is not applicable for categorising non-empirical studies such as historical and bibliographical research. Furthermore, only reports of single research investigations can be usefully classified in this scheme.”  相似文献   
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The rural population of semi-arid lands in Kenya face multiple challenges that result from population growth, poor markets, land use and climatic changes. In particular, subsistence oriented farmers face various risks and opportunities in their attempt to secure their livelihoods. This paper presents an analysis on how livelihood assets and strategies of smallholders in Laikipia County, Kenya, have changed within the last decade and discusses the implications for development interventions. The analysis is based on bi-temporal data from 170 semi-structured household interviews in 1997 and a follow-up survey of 30 households conducted in 2010. Well-being indicators were developed and livelihood portfolios compared. The results show a striking persistence in low asset endowment for the majority of smallholders from an aggregated perspective, whereas transitions into and out of better livelihood conditions become evident from a household perspective. The investment in, and accumulation of, conventional buffer or productive assets, such as grain stocks, livestock or land, does not shield households from adverse shocks and stresses as smallholders were shown to easily slip back into poverty. Household portfolios display particular constraints for smallholders in expanding natural resource related activities and a substantial decrease in livestock numbers. While off-farm activities could possibly increase well-being, the prevailing low income levels and high insecurity for the majority who are engaged in off-farm employment, limits the ability to increase livelihood assets in the area.  相似文献   
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