全文获取类型
收费全文 | 239篇 |
免费 | 6篇 |
专业分类
245篇 |
出版年
2019年 | 2篇 |
2018年 | 3篇 |
2017年 | 1篇 |
2016年 | 1篇 |
2015年 | 3篇 |
2014年 | 5篇 |
2013年 | 13篇 |
2012年 | 11篇 |
2011年 | 13篇 |
2010年 | 18篇 |
2009年 | 19篇 |
2008年 | 7篇 |
2007年 | 13篇 |
2006年 | 6篇 |
2005年 | 7篇 |
2004年 | 4篇 |
2003年 | 3篇 |
2002年 | 4篇 |
2001年 | 5篇 |
2000年 | 2篇 |
1999年 | 5篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 3篇 |
1995年 | 10篇 |
1994年 | 6篇 |
1993年 | 6篇 |
1992年 | 6篇 |
1991年 | 6篇 |
1990年 | 4篇 |
1989年 | 7篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1984年 | 6篇 |
1983年 | 1篇 |
1982年 | 4篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 7篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1975年 | 3篇 |
1973年 | 2篇 |
1971年 | 3篇 |
1969年 | 1篇 |
1967年 | 4篇 |
1963年 | 1篇 |
1961年 | 1篇 |
排序方式: 共有245条查询结果,搜索用时 0 毫秒
101.
102.
K. E. NDIEMA C. D. DILLIAN D. R. BRAUN J. W. K. HARRIS P. W. KIURA 《Archaeometry》2011,53(6):1085-1098
The Turkana Basin in Kenya has an extensive record of Holocene activities relating to mobility and economy of foraging and herding communities. Obsidian is only known from a few key localities in northern Kenya. As such, the use of obsidian as a toolstone material, commonly used during the mid‐Holocene, provides one way to trace exchange, interaction and population movements during the transition to pastoralism. We employ X‐ray fluorescence to characterize obsidian artefacts from four Pastoral Neolithic assemblages. Data reveal a highly mobile and diversified population that used watercraft to access and transport obsidian resources. Specifically, the use of the North Island obsidian source in Lake Turkana indicates that boat use was significant during this transitional period. The incorporation of watercraft transport and aquatic resources in our analyses of Pastoral Neolithic sites affords a greater understanding of subsistence, mobility and economy in this important period in East African prehistory. 相似文献
103.
Women who accompanied male adventurers and geographers often made crucial (yet generally unacknowledged) contributions to the research and writing of their partners. These women were not always named as authors, but nevertheless participated in the production and promotion of texts, influencing their form and their impact. In this light the author reconsiders the works of Isabel Burton, wife of the famous British Victorian traveller, geographer, translator and author, Richard Burton. Reinterpreting and recentring the marginalised and often caricatured Isabel Burton, it is shown that Isabel performed many roles in the 'Burton industry', influencing the production, content and circulation of texts attributed mainly to her husband. While Isabel frequently worked with her husband, she sometimes worked against him, subverting and recasting 'his' texts, partly in order to oppose her husband's sexual libertinism and to advance her own political agenda, which can be located within late-Victorian social purity movements. Isabel's involvement with the gendered politics of purity illustrates the second dimension in what the author calls the twofold sexual politics of authorship. 相似文献
104.
RICHARD G. WHITMAN 《International affairs》2016,92(3):509-529
A major public debate on the costs and benefits of the United Kingdom's membership of the European Union is presently under way. The outcome of the referendum on 23 June 2016 will be a pivotal moment in determining whether the EU has a future as a component of the UK's European diplomatic strategy or whether there is a major recalibration of how the UK relates to Europe and more widely of its role within international relations. Since accession to the European Economic Community the UK has evolved an uncodified, multipronged European diplomatic strategy. This has involved the UK seeking to reinforce its approach of shaping the security of the continent, preserving a leading diplomatic role for the UK in managing the international relations of Europe, and to maximize British trade and investment opportunities through a broadening and deepening of Europe as an economically liberal part of the global political economy. Since accession the UK's European diplomatic strategy has also been to use membership of the EU to facilitate the enhancement of its international influence, primarily as a vehicle for leveraging and amplifying broader national foreign and security policy objectives. The strategy has been consistent irrespective of which party has formed the government in the UK. Increasing domestic political difficulties with the process of European integration have now directly impacted on this European strategy with a referendum commitment. Whether a vote for a Brexit or a Bremain, the UK will be confronted with challenges for its future European strategy. 相似文献
105.
RICHARD SAKWA 《International affairs》2015,91(3):553-579
The unravelling of the post‐Cold War security order in Europe was both cause and consequence of the crisis in Ukraine. The crisis was a symptom of the three‐fold failure to achieve the aspirations to create a ‘Europe whole and free’ enunciated by the Charter of Paris in 1990, the drift in the European Union's behaviour from normative to geopolitical concerns, and the failure to institutionalize some form of pan‐continental unity. The structural failure to create a framework for normative and geopolitical pluralism on the continent meant that Russia was excluded from the new European order. No mode of reconciliation was found between the Brussels‐centred wider Europe and various ideas for greater European continental unification. Russia's relations with the EU became increasingly tense in the context of the Eastern Partnership and the Association Agreement with Ukraine. The EU and the Atlantic alliance moved towards a more hermetic and universal form of Atlanticism. Although there remain profound differences between the EU and its trans‐Atlantic partner and tensions between member states, the new Atlanticism threatens to subvert the EU's own normative principles. At the same time, Russia moved from a relatively complaisant approach to Atlanticism towards a more critical neo‐revisionism, although it does not challenge the legal or normative intellectual foundations of international order. This raises the question of whether we can speak of the ‘death of Europe’ as a project intended to transcend the logic of conflict on the continent. 相似文献
106.
Summary. Although the general distributions of stone axes and their sources have been studied for many years, it is not clear whether the production of these artefacts was carried out by specialists. One way of resolving the problem may be to consider the efficiency with which raw material was extracted. This paper describes an attempt to assess the factors influencing the siting of the Group VI stone quarries at Great Langdale. It is concluded that there is only a limited relationship between the most suitable locations, as suggested by detailed sampling of the outcrop, and those sites where stone working actually took place. This suggests that some of those using such sites may have lacked a detailed knowledge of the area. 相似文献
107.
108.
109.
110.