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   1065篇
  免费   1篇
  1066篇
  2021年   14篇
  2019年   27篇
  2018年   17篇
  2017年   17篇
  2016年   17篇
  2015年   14篇
  2014年   11篇
  2013年   175篇
  2010年   11篇
  2008年   10篇
  2007年   18篇
  2005年   14篇
  2004年   16篇
  2003年   14篇
  2002年   10篇
  2001年   10篇
  2000年   13篇
  1999年   9篇
  1998年   16篇
  1997年   19篇
  1996年   26篇
  1995年   10篇
  1994年   16篇
  1993年   19篇
  1992年   18篇
  1991年   26篇
  1990年   19篇
  1989年   37篇
  1988年   27篇
  1987年   25篇
  1986年   26篇
  1985年   21篇
  1984年   17篇
  1983年   11篇
  1982年   20篇
  1981年   18篇
  1980年   24篇
  1979年   18篇
  1978年   19篇
  1977年   16篇
  1976年   15篇
  1975年   14篇
  1974年   22篇
  1973年   14篇
  1972年   14篇
  1971年   22篇
  1970年   10篇
  1969年   14篇
  1968年   9篇
  1967年   12篇
排序方式: 共有1066条查询结果,搜索用时 0 毫秒
41.
Calculations for large Markovian finite source, finite repair capacity two-echelon repairable item inventory models are shown to be feasible using the randomization technique and a truncated state space approach. More complex models (involving transportation pipelines, multiple-item types and additional echelon levels) are also considered.  相似文献   
42.
Abstract

David Moore analyses the role of the Treasury in detemining and controlling defence policy and expenditure, and the place of the MoD within this function.  相似文献   
43.
44.
Barry Davies, Joining the SAS: How to Get In and What It's Like.Miami: Lewis International Inc., 1998. Pp.214, photos, index. $22.95. ISBN 0–966771–4–2.

Peter McAleese and John Avery, McAleese's Fighting Manual: The Definitive Soldier's Handbook.London: Orion, 1998. Pp.179, illus. £18.95. ISBN 0–75280–063–9.

Steve Crawford et al.The SAS Encyclopedia: The Definitive Guide to the World's Crack Regiment.Miami: Lewis International Inc., 1998. Pp.288, photos, maps, index. $29.95. ISBN 0–9666771–0–2.

Barry Davies et al.The Complete Encyclopedia of the SAS.London: Virgin Publishing Ltd, 1998. Pp.288, photos, maps, no index. $39.95. ISBN 1–85227–707–6.  相似文献   
45.
46.
47.
48.
This paper examines the rationale and centrality of private military and security companies (PMSCs) in humanitarian assistance operations in Sudan, asking why PMSCs are involved in humanitarian assistance operations in Sudan and what the principles underlying their activities are. To answer this question, the paper draws attention to the link between humanitarian crises and PMSC interventions. Where there is no meaningful alternative intervention, undergirded by humanitarian concerns that are also profit driven, PMSCs come in to provide the needed services. The protracted and complicated internal armed conflicts in Sudan, which have lasted for over two decades, have produced as many as 4,8 million internally displaced persons (IDPs) – the single largest number in the world. The kind of humanitarian assistance operations provided by PMSCs in Sudan have become critical to the provision of much-needed services which were inadequately provided by governmental authorities at both unilateral and multilateral levels. This paper argues that the humanitarian crises in Sudan created a regime that permits humanitarian assistance operations by both state and non-state actors.  相似文献   
49.

The original Olson and Zeckhauser model of alliance burden‐sharing was based on the following four assumptions: (1) alliance defence is a pure public good; (2) allied nations make their security contribution decisions without consulting the other allies; (3) alliances produce only a single public good; and (4) alliance defence is produced with equal degrees of efficiency in all alliance nations. But while the first of these assumptions has received a great deal of attention in the alliance literature, the remaining ones have received comparatively less attention, particularly in terms of empirical analyses. This paper synthesizes a varied literature developed around these four assumptions, both substantively and theoretically, and shows that when these assumptions are brought closer to real world approximations, hypotheses regarding the potential for security cooperation with less free‐riding result. This article also provides a simple test of Western alliance burden‐sharing in the areas of military spending, development resources spending, and research and development spending that supports the hypothesis positing more equitable burden‐sharing.  相似文献   
50.
The United Arab Emirates (UAE) has laid out an ambitious plan to become the first Arab country to possess a civilian nuclear energy program. Central to that effort has been the Emirati government's ability to obtain foreign nuclear assistance. This article traces the UAE's strategies for overcoming the obstacles that stood in the way of nuclear suppliers providing assistance. It examines the approach taken by the UAE to assuage the safety and security concerns of nuclear suppliers, how the UAE leveraged its alliances with France and the United States to obtain their cooperation, and its strategies for engaging domestic interest groups in supplier states. The generalizable elements of the UAE's strategies are discussed and used to provide insight into the prospects for other Middle Eastern states' bids to obtain similar assistance. The article concludes with a discussion of the potentially transformative aspects of the strategies employed by the UAE in shaping other countries' pursuit of nuclear energy in the region.  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