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Assessing Spatial Dependence in Count Data: Winsorized and Spatial Filter Specification Alternatives to the Auto-Poisson Model 总被引:2,自引:0,他引:2
Daniel A. Griffith 《Geographical analysis》2006,38(2):160-179
The auto-Poisson probability model furnishes an obvious tool for modeling counts of geographically distributed rare events. Unfortunately, its original specification can accommodate only negative spatial autocorrelation, which itself is a rare event. More recent alternative reformulations, namely, the Winsorized and spatial filter specifications, circumvent this drawback. A comparison of their performances presented in this article reveals some of their relative advantages and disadvantages. 相似文献
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Gilfoyle D 《Journal of the history of medicine and allied sciences》2006,61(1):26-65
This article examines the practice of veterinary immunology in South Africa during the first half of the twentieth century through an analysis of research into a horsesickness vaccine at the Onderstepoort Veterinary Institute. From the early 1900s, Arnold Theiler prioritized research into horsesickness, by then defined as an insect-borne disease caused by an ultravisible virus. He succeeded in devising a means of prophylaxis using a simultaneous injection of infective blood and immune serum, but he discovered antigenically different strains of the virus, which could overcome the immunity produced by his treatment. The practical value of Theiler's methods was further limited by difficulties in standardizing the biological material used in immunization, the results of which remained too erratic for application on a large scale. No further advances were made until the 1930s, by which time Onderstepoort had been drawn more closely into international scientific networks. Using techniques derived from research into yellow fever in America and canine distemper in Britain, the Onderstepoort scientist Raymond Alexander invented a method of immunization that utilized the propagation of the horsesickness virus in the brains of mice. Alexander's methods, which were characterized by successful technical adaptation and innovation, depended upon methods of quantification first developed by Paul Ehrlich to standardize diphtheria antitoxin during the 1890s. During the 1940s, vaccination expanded rapidly in South Africa, and Onderstepoort later exported the vaccine and associated technology to other countries affected by horsesickness. 相似文献
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Daniel Barish 《Frontiers of History in China》2019,14(2):212
The physical spaces of imperial education during the Qing were carefully constructed sites of political architecture that sought to shape the behavior of princes, emperors, and their teachers while projecting dynamic images of power. This article examines a range of buildings associated with the Qing pedagogical apparatus. It argues that the changing spaces of imperial education drew on both classical ideals and international iconographies of power to create and disseminate a fluid vision of rule. In the eighteenth century, the Qianlong emperor ordered the construction of the Biyong Hall at the center of the Imperial Academy in Beijing for exclusive use by the emperor during the Imperial Lecture, combining classical Han Chinese and Manchu expressions of authority. Throughout the nineteenth century, heirs to the throne and young emperors were trained in classrooms filled with calligraphy penned by their ancestors. Aphorisms drawing on the Confucian classics, as well as Daoist and Buddhist texts, urged the young rulers to strive for dynastic renewal. Finally, at the start of the twentieth century as the Qing worked to transition to a constitutional monarchy, imperial classrooms around Beijing were infused with Western architectural styles, incorporating new strands of authority for the reforming Qing dynasty. 相似文献
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Gordon L Clark Daniel Mansfield & Adam Tickell 《Transactions (Institute of British Geographers : 1965)》2002,27(1):91-110
Where there was a settled political geography of state power and responsibilities, the remarkable growth of global finance has put enormous pressure on national economic, political and social institutions. Furthermore, the looming crisis facing many continental European social security systems has raised many doubts about the long-term viability of the German model compared to its Anglo-American rivals. In this context, large German corporations have sought ways of sustaining their global competitiveness by, in part, restructuring their national and regional commitments. To illustrate, in this paper we concentrate on the nature and organization of German employer-sponsored pension institutions in relation to Anglo-American management practice. Two issues drive the analysis. One has to do with an emerging coalition between corporate management and shareholders with respect to the market value of the firm. The second issue has to do with the allocation of risk and uncertainty between the social partners when negotiating the financing and final value of promised retirement income. The institutional framework of collective decision-making common to many of Germany's largest firms is under pressure; three models of investment decision making relevant to pension assets and liabilities are used to illustrate this point. In doing so, we suggest that the German model is more fragile than commonly realized. We also suggest that Anglo-American management practices have penetrated and affected German corporate (national and regional) institutions and regulations. The social market lauded by advocates of stakeholder capitalism is changing rapidly, at least in the sphere of large firms and global finance. 相似文献