微量元素示踪法在青铜器铜料来源研究中的应用与进展

本文简要回顾了微量元素示踪法在青铜器铜料来源研究中的应用历史,分析了其应用现状,以及在一个时期内应用不理想的深刻原因。在此基础上,阐述了微量元素示踪法有效应用的前提条件,并进一步介绍了这一方法的最新进展情况。     

Liberia an(d) Empire?: Sovereignty, ‘Civilisation’ and Commerce in Nineteenth-Century West Africa

ABSTRACT

In the 1840s, Liberia was a black settler state on the West African coast which avowedly supported the connected ideologies of Christianity, commerce, and ‘civilisation’. However, from the 1870s, as the rest of West Africa began to be divided up into colonies, adherence to these ‘Western’ values did not spare Liberia’s leaders from some of the disruptive consequences of European expansionism. This article frames these consequences in the context of commercial clashes between the Liberian state and European traders (and their companies). These clashes predated Liberia’s declaration of independence in 1847, worsened thereafter, and later became increasingly politicised with the stricter enforcement of colonial law in the region in the 1870s, partly as a result of economic crisis. On the coast, Liberian officials struggled legally and militarily to stave off the activities of European smugglers with diplomatic backing. In the interior, commercial alliances were forged with local authorities in an attempt to keep out the French and the British, in particular. Conflicts over the collection of customs duties, the setting of borders, and, ultimately, the nature and extent of Liberian sovereignty, reached a climax during the Berlin Conference (1884–1885). The Conference led Liberia, by 1904, to implement its own version of colonial ‘indirect rule’: first and foremost to safeguard its independence, secondarily as a tool of expansion. In spite of major losses Liberian leaders were ultimately able to strengthen the country’s standing as a member of the international community of nations.     

Comparison of two cluster life stages in a synthetic knowledge base

ABSTRACT

Knowledge flows in clusters are highly important since they are related to innovation. Types and spatial levels of knowledge sources have been studied by many scholars. This study examines knowledge sources from evolutionary perspective. Evolutionary Economic Geography suggests that regional industries and their dynamics co-evolve. While conceptual and empirical studies argue that network characteristics take different characteristics throughout time, and that knowledge sources are subject to change, little is known about in what way they change in a synthetic knowledge base. In this study, we examined the knowledge sources in a specific knowledge base throughout time. The study was applied to two clusters in Turkey in a synthetic knowledge base yet in different life stages: emergence and maturity. The network structure was analysed by social network analysis, hypotheses were tested by Mann–Whitney U-Tests. The findings show that although network structure and density change through maturity, the types and spatial levels of knowledge sources do not vary between the two life stages, they keep the same characteristics of their knowledge bases.