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   506篇
  免费   17篇
  国内免费   1篇
  2021年   5篇
  2020年   5篇
  2019年   12篇
  2018年   7篇
  2017年   14篇
  2016年   11篇
  2015年   7篇
  2014年   10篇
  2013年   123篇
  2012年   5篇
  2011年   6篇
  2010年   7篇
  2009年   6篇
  2008年   5篇
  2007年   6篇
  2006年   8篇
  2005年   6篇
  2003年   5篇
  2002年   5篇
  2001年   5篇
  2000年   5篇
  1998年   5篇
  1997年   7篇
  1996年   9篇
  1995年   8篇
  1994年   9篇
  1993年   11篇
  1992年   12篇
  1991年   15篇
  1989年   10篇
  1988年   7篇
  1987年   10篇
  1986年   10篇
  1985年   14篇
  1984年   7篇
  1982年   5篇
  1981年   5篇
  1980年   11篇
  1979年   7篇
  1978年   9篇
  1976年   8篇
  1975年   10篇
  1974年   10篇
  1973年   10篇
  1972年   5篇
  1971年   5篇
  1970年   8篇
  1969年   5篇
  1968年   7篇
  1967年   4篇
排序方式: 共有524条查询结果,搜索用时 0 毫秒
441.
The issue that this paper tackles is the assessment of the relative security benefits that Cyprus and Greece derive in the context of their cooperation on defence matters. This form of cooperation, known as the ‘Integrated Defence Space Doctrine’, aims at defending their interests in the Aegean Sea and the broader East Mediterranean theatre. The paper relies heavily on earlier research on this topic, which deals with the Greek–Cypriot alliance facing an arms race against Turkey, and uses a coefficient especially designed to assess the optimal levels of security and the associated defence expenditure of the two allies. A comparison of the relative security coefficient values for the two allies suggests that the security benefit that Greece derives thanks to its alliance with Cyprus exceeds the corresponding Cypriot benefit by far. Given the importance assigned to human resources by this index, in conjunction with the demographic problems of Greece, this conclusion justifies the recent Greek defence policy revision, emphasizing quality, capital equipment and flexibility of forces. This revision aims at satisfying the security requirements of the alliance and the increasing demands of an arms race against Turkey.  相似文献   
442.

Small countries may not be able to afford all force elements (army, navy, air-force) operated by larger countries and certainly cannot afford all sub-elements (aircraft carriers, submarines, etc). This paper provides a framework for a small country to analyse its force structure, examining the influence of objectives, international co-operation, funding and technological constraints, and uncertainty. We analyse when a small country may choose to retain a balanced structure (with each force element) and when it may choose to drop one or more elements. The issues are illustrated with the decision by the New Zealand government over whether to retain a strike aircraft capacity.  相似文献   
443.
In recent years military procurement agencies have used “progress payments” in contracting. Although, overall, the adoption of such a policy may well have contributed to a decrease in total costs of procurement, we identify a class of inefficiencies that are likely to have been generated by it.  相似文献   
444.
Chowdhury (1991) applied Granger causality methods to military expenditure and economic growth series in 55 developing countries. This note applies a similar approach to Australia and finds no causal relationship between military expenditure and growth in either direction.  相似文献   
445.
For a three‐sector Feder‐Ram framework, we present time‐series, cross‐sectional estimates for two cohorts, consisting of Asian and Latin American countries. The estimates indicate that private investment, and defense and non‐defense public spending are growth promoting for alternative error components representations. For the best error components representation, greater growth enhancement is associated with the two forms of public spending in Asia than in Latin America, while the opposite comparison characterizes private investment. Although defense is growth promoting, an opportunity cost exists insofar as non‐defense spending, financed by defense spending, appears to give a small net boost to growth in Latin America.  相似文献   
446.
447.
448.
In the aftermath of September 11, 2001 and Hurricane Katrina, the United States government has spent tens of billions of dollars to improve the nation's ability to respond to a natural disaster or terrorist attack, but the emphasis on immediate first response has left many long-term environmental, political, and technological challenges unaddressed. Although a dirty bomb attack is unlikely to yield the same amount of physical devastation and death as caused by Katrina or a nuclear weapon, the social, psychological, and economic impact would be enormous. At present, however, the United States lacks the technology necessary to decontaminate a large, densely populated urban area under time, political, and economic constraints. This article reviews past cleanup experiences and current decontamination capabilities to consider the long-term implications of a dirty bomb, identifies weaknesses in America's existing response capabilities, notes possible areas of political friction, and considers the implications of the failure to adequately prepare. Having the appropriate decontamination techniques established and long-term plans in place before an incident occurs will significantly improve the government's ability to protect public and environmental security, establish a viable decontamination strategy, allow residents to return to their homes, and get the local economy back on its feet.  相似文献   
449.
15 Minutes: General Curtis LeMay and the Countdown to Nuclear Annihilation, by L. Douglas Keeney. St. Martin's Press, 2011. 384 pages, $27.  相似文献   
450.
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