首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   239篇
  免费   8篇
  2020年   1篇
  2019年   5篇
  2016年   2篇
  2015年   6篇
  2014年   1篇
  2013年   18篇
  2012年   8篇
  2011年   17篇
  2010年   10篇
  2009年   17篇
  2008年   14篇
  2007年   15篇
  2006年   13篇
  2005年   10篇
  2004年   1篇
  2003年   5篇
  2002年   1篇
  2001年   3篇
  2000年   5篇
  1998年   3篇
  1997年   3篇
  1996年   6篇
  1995年   6篇
  1994年   3篇
  1993年   2篇
  1992年   3篇
  1991年   2篇
  1990年   4篇
  1989年   9篇
  1988年   4篇
  1987年   7篇
  1986年   2篇
  1985年   4篇
  1984年   6篇
  1983年   3篇
  1982年   2篇
  1981年   1篇
  1980年   3篇
  1979年   4篇
  1978年   4篇
  1976年   3篇
  1975年   2篇
  1974年   1篇
  1972年   1篇
  1971年   1篇
  1969年   1篇
  1967年   2篇
  1965年   2篇
  1955年   1篇
排序方式: 共有247条查询结果,搜索用时 15 毫秒
21.
Within the next five years, Chinese trade with Africa is predicted to reach $100 billion per year. Much of this springs from China's growing expansion into Africa's oil markets. It is argued that Chinese oil diplomacy in Africa has two main goals: in the short-term to secure oil supplies to help feed growing domestic demand back in China; and in the long-term, to position China as a global player in the international oil market. Yet at the same time, this oil safari is being accompanied by an explicit stance that emphasizes state sovereignty and 'non-interference' in domestic affairs and is wholly disinterested in transparency or human rights. Consequently, Beijing has increasingly been accused of turning a blind eye to autocracy and corruption. China is also threatening to undercut efforts by the African Union and its western partners to make government and business more accountable. While China is providing investment where little was previously forthcoming, concerns about Beijing's engagement with Africa's oil industries need to be resolved, not least by African leaders themselves.  相似文献   
22.
A major advantage of satellite remote sensing is that the imagery acquired provides a synoptic view of the landscape. Thus, repeat coverage by the satellite on a regular basis permits the detection of changes in land‐cover over time. This study demonstrates the application of remote sensing technology to the monitoring of mining activities at the Athabasca Oil Sands region of Alberta, Canada. First, we describe the techniques used to match a time sequence of Landsat imagery, both spatially and spectrally, to ensure that the spectral changes through time are due to land‐cover variations. A series of spectral trajectories were then extracted to assess changes in land‐cover through time. Secondly, a land‐cover classification was produced from the baseline 1984 imagery and, using historic and future mine extents, the classification was analyzed to determine the proportion of each land‐cover type affected through development. Results of the analysis indicate that since 1984 there has been a larger reduction in mixedwood dense and broadleaf vegetation classes than mixedwood sparse or dense conifer stands in the area. Based on the delineations of mine‐site activity, the area of woodland and wetland habitat subject to development has increased from approximately 2,520 hectare (ha) in 1984 to 32,930 ha in 2005.  相似文献   
23.
24.
European security depends on the effective collaboration of the five major powers; it will be undermined by the extension of NATO, a policy driven by US domestic politics. The main threats to security are: the breakdown of political and economic stability; unintended nuclear proliferation and/or failure of the START process; Russia's evolving political and territorial aspirations. All three will remain marginal as long as Russia is constructively engaged with the West. NATO expansion threatens that engagement. It is seen by all strands of Russian opinion as violating the bargain struck in 1990 and will likely lead to the withdrawal of cooperation. Invitations to Poland, Hungary and the Czech Republic cannot be rescinded, but the consequences can be mitigated by refraining from integrating them into NATO's military structure, by ceasing to insist that NATO membership is open to all, and by perpetuating the de facto nuclear‐weapons‐free zone that presently exists in Central and Eastern Europe. Britain's stance could be pivotal.  相似文献   
25.
26.
27.
This article examines the political history of the parliamentary borough of Ripon between the Great Reform Act of 1832 and the Second Reform Act of 1867. It challenges the notion that Ripon remained a ‘pocket borough’ during this era; rather, the Reform Act rendered Ripon's politics much more open, vibrant and participatory than they had been during the ‘unreformed’ era. In demonstrating this, the article calls into question the alleged prevalence of ‘pocket boroughs’ in the reformed era.  相似文献   
28.
The proper character of the relationship between missionaries and politics shaped one of the most contentious debates within the first century of the modern missionary movement. While the leadership of the missionary societies repeatedly insisted upon the separation between the work of the gospel and politics, missionaries in the field frequently found it difficult to remove themselves from political controversies. John Philip and James Read served with the London Missionary Society in the Cape Colony for most of the first half of the 19th century. Their persistent defence of the interests of the colonial Khoi made them controversial figures in the debates over the social, political and economic structures of the Cape Colony. Missionaries like Read and Philip, rarely described their activities as ‘political’, and certainly did not conceive of their work as in any way related to the patronage‐ridden political system of the early 19th century. Nonetheless, in their promotion of the ideas of religious and civil equality, and in their effective use of public opinion to shape government and public perception of colonial policy, their actions reflected many of the important changes taking place in contemporary British politics. Dissenting political activity focused on the issues of the defence of religious liberty, the struggle to secure their own civil equality, and the debate over the proper relationship between church and state. These issues also played a crucial role in colonial politics throughout the period. This essay will illustrate the important role of the foreign missionary movement in this process. Examining the work of Philip and Read enables us to identify the ways that issues of domestic politics helped to shape the political debates emerging in Britain's expanding empire.  相似文献   
29.
Our purpose in this paper is to chart the increasing and diffuse importance of feminist scholarship to political geography. We argue that feminist geographers have spatialized multiple forms of the political, rather than simply offering a singular feminist perspective to the literature. To canvas that breadth we suggest three distinct (albeit obviously related) takes on the political in feminist political geography: the distributive, the antagonistic, and the constitutive. This framework showcases the impressive breadth of feminist political geography and perhaps works against a sense of marginality that stems from such diffuseness. We illustrate our argument with particular reference to research that has appeared in Gender, Place and Culture over the past decade.  相似文献   
30.
The concept of human security, while much contested in both academic and policy debates, and highly fragmented across different meanings and forms of implementation, offers a potential locus around which global security discourse might converge, particularly in light of current shifts in US security thinking. However, key pioneers of human security, such as the United Nations and Canada, appear to be losing their enthusiasm for the concept, just at the moment when others such as the European Union, are advancing a human security agenda. This article examines the divergence of human security narratives between the UN and the EU. It argues that the UN's use of the concept ran aground owing to a triple problematic of lack of clarity, confusion between previously distinct policy streams on human rights and human development and conceptual overstretch. After assessing the EU experience with the concept to date, the article argues that future use of human security will require greater focus on how it deepens ideas of individual security, rather than treating it as an agenda for broadening security. As well as a need to project clarity on the conceptual definition of human security, there is also a need to associate human security with greater clarity of intent. If successful, this would contribute to establishing second generation human security as a new policy paradigm.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号