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341.
Zone pricing consists in determining simultaneously several delivered prices together with the zones where these prices apply. A model and algorithm are proposed to determine optimal facility locations, prices, tariff-zones, and market areas in order to maximize the firm's profit under zone pricing. The resulting nonlinear mixed-integer program is tackled by projecting the objective function on the price space, solving repeatedly uncapacitated facility location problems for fixed values of the prices. The implicit profit function so defined is optimized by branch-and-bound. Computational results are reported.  相似文献   
342.
This article explores the work by Bernard Katz (1911–2003), Stephen W. Kuffler (1913–1980), and John C. Eccles (1903–1997) on the nerve–muscle junction as a milestone in twentieth-century neurophysiology with wider scientific implications. The historical question is approached from two perspectives: (a) an investigation of twentieth-century solutions to a longer physiological dispute and (b) an examination of a new kind of laboratory and academic cooperation. From this vantage point, the work pursued in Sydney by Sir John Carew Eccles’ team on the neuromuscular junction is particularly valuable, since it contributed a central functional element to modern physiological understanding regarding the function and structure of the human and animal nervous system. The reflex model of neuromuscular action had already been advanced by neuroanatomists such as Georg Prochaska (1749–1820) in Bohemia since the eighteenth century. It became a major component of neurophysiological theories during the nineteenth century, based on the law associated with the names of François Magendie (1783–1855) in France and Charles Bell (1774–1842) in Britain regarding the functional differences of the sensory and motor spinal nerves. Yet, it was not until the beginning of the twentieth century that both the histological and the neurophysiological understanding of the nerve–muscle connection became entirely understood and the chemical versus electrical transmission further elicited as the mechanisms of inhibition. John C. Eccles, Bernard Katz, and Stephen W. Kuffler helped to provide some of the missing links for modern neurophysiology. The current article explores several of their scientific contributions and investigates how the context of forced migration contributed to these interactions in contingently new ways.  相似文献   
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Journal of Archaeological Method and Theory - We review palaeoenvironmental proxies and combinations of these relevant for understanding hunter-gatherer niche construction activities in...  相似文献   
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Private business investments in heritage sites in Tanzania have recently captured scholarly interest of some archaeologists. Curiosity in the matter has largely emanated from a fundamental need to widen the sites’ utilization through heritage tourism. This paper reviews a recent incident in which a local community explicitly opposed the minister of Natural Resources and Tourism handing over ceremony of Kunduchi ruins site to a private investor. The paper also highlights recent developments, problems in private business investments, and their potential implications to the conservation and management of heritage sites in Tanzania.  相似文献   
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Book reviewed in this article:
Akira Iriye, Cultural Internationalism and World Order  相似文献   
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This review essay seeks to direct attention to intellectual history as a new and flourishing subfield in the historiography of post‐1945 Germany. The essay probes and critically interrogates some of the basic arguments of Dirk Moses' prize‐winning monograph German Intellectuals and the Nazi Past. It does so by engaging with a series of German‐language monographs on key intellectuals of the postwar period (Alexander Mitscherlich, Jürgen Habermas, Herbert Marcuse) or groups of intellectuals that have appeared during the last few years. The essay also includes two books that focus on intellectual transfers from and to the United States and hence transcend the purely national framework. The essay highlights some broader themes such as West German intellectuals' confrontation with the Nazi past and with the memory of Germany's failed experiment with democracy during the interwar Weimar Republic. It also discusses the significance of the West German student movement in the 1960s for West German intellectual history. The essay concludes with some broader reflections on writing intellectual history of the postwar period, and it points to some avenues for further research. It underlines the significance of intellectual debates—and hence of intellectual history—for charting and explaining the process of postwar democratization and liberalization in the Federal Republic of Germany.  相似文献   
350.
The clash between unilateralists and multilateralists dominates contemporary debate, with many assuming that American foreign policy must result from nothing more or less than a tug of war between the two. The practicalities of diplomacy at a juncture of competing viewpoints on American power reveal, however, that this old dichotomy simply has lost steam as a policy–making engine. Springing straight from today's front pages and centred in the transatlantic conversation over America's role in the world, this article throws into question how America and its allies grapple for international initiative. Managing American power demands a new concept—anchored as much in the social arena of consensus formation described by Jürgen Habermas as in the experience of corporate officers leading a large business. The article argues that the real world challenges facing America as unrivalled superpower have strained the old approach, and asks if managing American influence has to continue as an either/or choice between ‘going it alone’ or waiting for others to recognize new threats. Or might it instead transform into a quest for integrating key constituencies behind practical action?  相似文献   
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