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Product differentiation trade models have been developed in order to account for some contemporary patterns of international trade that are inexplicable under the theory of comparative advantage. This paper presents the case for the geographical differentiation of products. A generalized geographical product differentiation model of trade competition in industrial third markets is outlined within a discrete choice framework. The model treats product price and quality, as determined by country of origin, as distinct variables in export competition. An indirect empirical test of the model's validity, using the cases of export competition between the United States and the Federal Republic of Germany and the United States and Japan, indicates that the generalized model is worthwhile in its ability to account for successful trade competition.  相似文献   
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Maya Blue, a nano-structured clay–organic complex of palygorskite and indigo, was used predominantly before the Spanish Conquest. It has fascinated chemists, material scientists, archaeologists and art historians for decades because it is resistant to the effect of acids, alkalis, and other reagents, and its rich color has persisted for centuries in the harsh tropical climate of southern Mesoamerica. One of its components, palygorskite, is part of modern Maya indigenous knowledge, and ethnohistoric and archaeological data suggest that its modern sources were probably utilized in Prehispanic times. Yet no direct evidence verifies that palygorskite was actually mined from these sources to make Maya Blue. Here we characterize these sources compositionally, and compare our analyses to those of Maya Blue from Chichén Itzá and Palenque. We demonstrate that the palygorskite in most of these samples came from modern mines, providing the first direct evidence for the use of these sources for making Maya Blue. These findings reveal that modern Maya indigenous knowledge about palygorskite, its mining, and its source locations, is at least seven centuries old.  相似文献   
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The Arab–Israeli War of 1948 produced complex questions that needed to be solved to obtain peace. Whereas the Arab states suffered humiliating defeats, Israel was the undisputed winner, expanding and solidifying its power. For the Palestinians, the outcome was catastrophic. Between 600,000 and 760,000 Palestinians fled, becoming refugees on the West Bank, the Gaza Strip, and in surrounding Arab states. Palestinian society collapsed and Palestine became divided between Israel, Egypt, and Jordan, leaving the borders undecided. The Palestinians’ dreams of statehood were crushed. After the war, Israel used diplomacy to achieve its goals, defending the post-war status quo to preserve its expanded territory and resisting the return of Palestinian refugees. Through its membership in the Palestine Conciliation Commission (PCC), established by the United Nations (UN) in 1948 to solve these problems, the United States was deeply involved in the negotiations. The United States became the informal, yet undisputed leader of the PCC, thus, it would seem, empowering it with the muscles of a superpower. After three years of struggling for peace the PCC had toadmit failure. Knowledge about these negotiations gives important insights into how mediators approached the conflict and shows that power asymmetry may explain why the belligerents could not obtain peace.  相似文献   
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Rapid advances in geophysical techniques over the past decade have provided the maritime archaeological community with significant opportunities for re‐defining the procedures for wreck‐site mapping, evaluation and monitoring. The techniques which offer most potential for high‐resolution survey are acoustic‐based and include sidescan sonar, swath‐bathymetry sonar and multibeam sonar. These techniques were tested on an artificial test‐site in Plymouth Sound and over the wreck of the Stirling Castle. Results demonstrate that the techniques can provide the maritime archaeologist with the opportunity to rapidly and cost‐effectively map and monitor small, centimetric changes on sites, with the potential for long‐term monitoring and management. © 2009 The Authors  相似文献   
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This paper examines a key issue in the history of the climate in the pre-instrumental period, that is, how to use narrative sources which make frequent references to weather events, but which need contextualised interpretation. The paper follows an argument that climatological techniques for deriving temperature indices from chronicles, though they have become increasingly elaborate and refined, nevertheless leave out much that is of interest to the social historian. This paper explores the area of the what-is-left-behind when chronicle narratives are reduced to numerical indices. Investigating a broad range of Latin and Italian chronicles from fourteenth and fifteenth-century Italy, the paper draws three main conclusions: that sensitivity to weather events not only varied greatly among writers (as one might expect) but so too did their use of severe weather to serve the purposes of narrative (through sequencing, metaphor and analogy); that sensitivity to meteorological anomaly changed during the period, especially in the fifteenth century with the spread of prognosticating verses; and that the broadening of chroniclers' interests in weather, both ordinary and extraordinary, and in its effects on everyday, material life may allow a connection to and re-evaluation of the Burckhartian idea of the Renaissance ‘discovery of the world’.  相似文献   
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This article seeks to continue the discussion carried on in previous editions of the journal concerning the concepts of transfer, crossed and entangled history and their employment in various fields of enquiry. Specifically, it attempts to clarify some of the principles associated with this growing body of scholarship and the manner in which they may aid in the conceptualisation and historiography of the rise of national movements over the period 1763–1848. Given the procedural dispositions described below, crossed or entangled histories on the rise of nationalism in Europe and the European colonial world would be expected to incline toward particular subject matter and questions, and even presuppose, to paraphrase another writer, a conception of the nation as ‘a relational (cultural) construct’. This largely cultural perspective on the rise and early history of national movements in Europe and the Atlantic World has a number of heuristic advantages, not least of which is its value in enabling productive linkages between older approaches to the subject.  相似文献   
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