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   507篇
  免费   19篇
  2021年   5篇
  2019年   11篇
  2018年   11篇
  2017年   12篇
  2016年   11篇
  2015年   11篇
  2014年   10篇
  2013年   108篇
  2011年   4篇
  2009年   4篇
  2007年   8篇
  2006年   4篇
  2005年   8篇
  2004年   10篇
  2003年   7篇
  2002年   7篇
  2001年   7篇
  2000年   4篇
  1999年   7篇
  1998年   9篇
  1997年   10篇
  1996年   7篇
  1995年   13篇
  1994年   14篇
  1993年   11篇
  1992年   13篇
  1991年   12篇
  1990年   6篇
  1989年   7篇
  1988年   10篇
  1987年   9篇
  1985年   10篇
  1984年   12篇
  1983年   6篇
  1982年   6篇
  1981年   9篇
  1980年   7篇
  1979年   11篇
  1978年   6篇
  1977年   6篇
  1976年   7篇
  1975年   8篇
  1974年   9篇
  1973年   9篇
  1972年   9篇
  1971年   6篇
  1970年   4篇
  1969年   4篇
  1968年   5篇
  1967年   4篇
排序方式: 共有526条查询结果,搜索用时 15 毫秒
261.
ABSTRACT

This article systematically assesses the 2014 Afghanistan Presidential Election, the first transfer of power from President Hamid Karzai to an elected successor, using provincial voting data as well as explicit data from polling centers. The analysis finds unusual voting results in the April election, where no candidate received 50%+1 votes required by the Afghan constitution, versus the voting results realized for the June ‘runoff election.’ As in other Afghan voting analyses, this article finds voting based on ethno-linguistic preferences, and interestingly found Dr. Ashraf Ghani receiving almost all the swing votes in the runoff election even though the other leading candidate from the April election all endorsed Dr. Abdullah Abdullah. More importantly, however, the research presented here clearly finds extremely strange voting patterns. For example, the polling data center analysis finds 606 polling places where Ghani received all 600 votes and Abdullah received none and another 900 polling centers that gave virtually all its votes to Ghani. These results in combination with other analyses raise the very real possibility that the election results were illegitimate. The article concludes with a discussion of the implications of the research to future Afghan elections and their processes as well as to the long-standing conflict in the country.  相似文献   
262.
Abstract

In counterinsurgency, the population is the center of gravity. This insight has become a key doctrinal tenet of modern armed conflict. But where does it come from? The razzia, a tactic introduced by the French in North Africa around 1840, first thrust tribal populations into the focus of modern operational thinking. Soon the pioneering bureaux arabes added an administrative, civil, and political element. Eventually, in the 1890s, French operations in Madagascar gave rise to a mature counterinsurgency doctrine. David Galula, a French writer who heavily influenced the American Counterinsurgency manual, is merely the joint that connects the nineteenth century to the twenty-first.  相似文献   
263.
It is the purpose of this article to illustrate how the British government reached its decision to upgrade the Polaris strategic nuclear deterrent in 1973. Using British and American documentation it is demonstrated that the strategic imperatives for upgrading Polaris were fundamental to the project. Existing accounts of the Polaris Improvement Project, however, have not given the appropriate attention to the wider US–UK political differences in this period. By doing so it is shown how in addition to the wider economic, strategic and political factors, this was of paramount significance in the Heath government opting for the ‘Super Antelope’ method in upgrading Polaris.1 1‘Super Antelope’ was the codename for the upgrade of Polaris. This was eventually changed to ‘Chevaline’. Peter Hennessy, Cabinets and the Bomb (Oxford: OUP 2007), 28–9. View all notes  相似文献   
264.
265.
Interpreting the Nuclear Non-Proliferation Treaty, by Daniel H. Joyner. Oxford University Press, 2011. 192 pages, $100.  相似文献   
266.
ABSTRACT

This article explores how two influential American policy makers—Paul Nitze and McGeorge Bundy—wrestled with the idea of a norm against the use of nuclear weapons. Existing scholarship has overlooked how both Bundy and Nitze came to understand the idea of nuclear non-use, especially related to the credibility of threats to use nuclear weapons. Using documentary evidence from their personal papers, this article illuminates the thinking of Bundy and Nitze, finding that both engaged with the idea of a norm of non-use of nuclear weapons in their strategic writing and thought.  相似文献   
267.
The United States has multiple nuclear detection initiatives to secure against a terrorist nuclear attack, including the Container Security Initiative, installation of radiation detectors at U.S. border points of entry, and establishment of the Domestic Nuclear Detection Office (DNDO). The current nuclear detection system architecture falls short of being able to reliably catch fissile nuclear material in transit, specifically shielded Highly Enriched Uranium (HEU) and Plutonium (Pu), both within the US and abroad. Checkpoints at border crossings can be circumvented, and no adequate system is under development to deter the transport of fissile materials. Using nuclear link-budget calculations, we show why a network relying primarily on handhelds, fixed detectors, and portals is not sufficient. We examine the technical, economic, and operational feasibility of a comprehensive national network incorporating in-vehicle detectors to reliably detect and deter the transport of fissile material inside the vehicle itself.  相似文献   
268.
269.
As many states in the Middle East are considering whether to embark on nuclear power programs, there is an urgent need to develop confidence-building measures to reassure states in the region that the programs are peaceful. One possible path would be to consider multilateral approaches to the fuel cycle in order to foster nuclear cooperation between states in the region, instead of each state going it alone, which would likely increase suspicions and the risk of a cascade of nuclear proliferation. With its policy of “zero problems with neighbors,” strategic connection to the West, and long-standing experience in the nuclear field, Turkey would be well-placed to take the lead on such a nuclear confidence-building agenda. Over time and under the right political conditions, Turkey could initiate or participate in measures including cooperation on nuclear education, safety and security, research and development, and joint fuel cycle facilities such as a regional fuel fabrication center.  相似文献   
270.
U.S. nuclear export policy has undergone major transformations since 1945, and the most recent change, as expressed in the July 18, 2005, India-U.S. Joint Statement, represents an especially significant shift in policy. The document reverses more than a quarter century of U.S. declaratory policy, suggesting that the current U.S. administration regards nuclear proliferation to be both inevitable and not necessarily a bad thing. This article investigates this policy shift, looking at the history of U.S. nuclear export policy and the potential ramifications of the new policy on the Treaty on the Non-Proliferation of Nuclear Weapons (NPT). The author also touches on the potential effects of the Joint Statement on Indian-Pakistani relations. Finally, it is suggested that it is not too late for India and the United States to change the new policy with more consideration for the NPT and the Nuclear Suppliers Group Initiative.  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