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   246篇
  免费   3篇
  249篇
  2021年   3篇
  2019年   3篇
  2017年   5篇
  2016年   3篇
  2015年   4篇
  2014年   2篇
  2013年   61篇
  2011年   2篇
  2010年   2篇
  2008年   3篇
  2007年   3篇
  2006年   2篇
  2005年   4篇
  2004年   2篇
  2003年   3篇
  2002年   2篇
  2000年   2篇
  1999年   3篇
  1996年   4篇
  1995年   5篇
  1994年   5篇
  1993年   3篇
  1992年   3篇
  1991年   4篇
  1990年   2篇
  1989年   5篇
  1988年   6篇
  1987年   5篇
  1986年   7篇
  1985年   6篇
  1984年   1篇
  1983年   4篇
  1982年   8篇
  1981年   1篇
  1980年   5篇
  1979年   3篇
  1978年   3篇
  1977年   4篇
  1976年   2篇
  1975年   5篇
  1974年   5篇
  1973年   6篇
  1972年   5篇
  1971年   8篇
  1970年   3篇
  1969年   5篇
  1968年   5篇
  1967年   2篇
  1966年   2篇
  1948年   3篇
排序方式: 共有249条查询结果,搜索用时 0 毫秒
221.
There are multiple damage functions in the literature to estimate the probability that a single weapon detonation destroys a point target. This paper addresses differences in the tails of four of the more popular damage functions. These four cover the asymptotic tail behaviors of all monotonically decreasing damage functions with well‐behaved hazard functions. The differences in estimates of probability of kill are quite dramatic for large aim‐point offsets. This is particularly important when balancing the number of threats that can be engaged with the chances of fratricide and collateral damage. In general, analysts substituting one damage function for another may badly estimate kill probabilities in offset‐aiming, which could result in poor doctrine. © 2003 Wiley Periodicals, Inc. Naval Research Logistics 50: 306–321, 2003.  相似文献   
222.
223.
Peru has battled two major insurgent movements since 1980. Around 25,000 Peruvians have died in this war between the government against the Shining Path and the MRTA. The Peruvian military has been incapable of achieving total victory after several major operations and the capture of just about every major rebel leader. Even worse, after a few years of almost no activity, Shining Path seems to be re-emerging. The last remaining members of this insurgent group have made alliances with foreign terrorist groups, used drug traffic to fund their fight and sweet talked people who are very disappointed and mad at the current Toledo administration, to gain more supporters. Major changes have to occur to prevent both groups from becoming threats to national security and society as a whole, taking the country back to times when around half of the nation was declared to be under terrorist control. The defense budget must be increased to open new bases, buy new equipment and train soldiers better to fight the insurgents more effectively. At the same time, major social changes need to occur; Toledo and his government must gain the trust and sympathy of Peruvians again by working for and with them.  相似文献   
224.
The Ministry of Defence (MOD) has published estimates of the number of average full‐time UK industry employees dependent on MOD expenditure and defence exports for a number of years. This paper provides the outcome of a recent review of the process used. The method of deriving MOD and defence export final demand vectors, and calculating from these estimates of direct employment (i.e. that in supplying companies) and indirect employment (i.e. that incurred through the supply chain) are described. Difficulties with the data are explored. Alternative approaches, methods used in other countries and challenges posed by changing MOD administrative systems are briefly discussed.  相似文献   
225.
An examination of past analyses suggests that today's sailors may be less responsive to compensation changes than previous generations. Such a change could make recruiting and retaining high‐quality sailors more difficult. However, variation in researchers' decisions over time may simply have created the appearance of such a change. Our results suggest there is little variation in the pay elasticity over time. In contrast, the different reduced‐form models we use to measure this relationship can explain most of the variation in the literature. Therefore, the evidence suggests that while sailors may have changed over time, their response to compensation has not.  相似文献   
226.
Defense budgets in Japan have been complicated compromises from numerous inputs ‐ including threat perceptions, domestic industrial/technological base development, support for the bilateral security treaty with the United States and internal bureaucratic politics ‐ but with the fall of the former Soviet Union, the clearest justification for higher spending disappeared. Double‐digit defense spending increases that were common in the 1980s have been replaced by annual increases lower than present inflation rates, resulting in negative real growth in the country's defense budget. Domestic economic problems and consistent government pressures for smaller budgets have further slowed annual growth in total spending and have contributed to lower procurement budgets. As a result, the domestic Japanese defense industry is facing far more constrained conditions from the growth years of a decade before.

Government policymakers are examining Japan's regional security environment as well as its alliance with the United States to determine the appropriate course for the country to take in the coming years. The formal security treaty with the United States is likely to remain a major element of government positions, but other aspects of the country's overall security posture are open to debate. Perceptions of a reduced threat environment are fueling additional pressures for defense budget cuts.

The domestic defense industry seeks means to assure its survival in domestic defense markets in this constrained environment. Expansion into overseas markets to offset declining domestic markets is an option that currently is constrained by policy restrictions on arms exports. Industry is advocating re‐examination of those policies and unlike earlier years, government appears willing to respond positively but cautiously to this lobbying.  相似文献   
227.
Some have argued that the transatlantic rancor over the Iraq war made cooperation, especially on nonproliferation, unlikely. In contrast, this article, documents post-invasion instances of nonproliferation cooperation, with particular emphasis on the Proliferation Security Initiative and the EU-3 Initiative—the British, French, and German negotiations with Iran over its suspected nuclear activities. In addition to documenting French and British participation in these initiatives, the article analyzes why they have chosen to participate and argues that France and Britain have participated in both efforts because they are committed to avoiding future Iraq-like preventive wars.  相似文献   
228.
229.
Domestic factors play an important role in the formulation and evolution of a country's foreign and security policy. This is clearly seen in the case study of a Soviet successor state, Ukraine. The article brings together in seven sections theory with the key domestic factors that influence Ukrainian security policy, such as economics, energy, national identity, elites and political parties. The article provides an insight into how these domestic factors influence the course of Ukrainian security policy which is striking a balance between the twin extremes of Soviet re‐integration, which would be tantamount to the loss of independence, and nationalist maximalism which seeks to place as much distance as possible between Ukraine and Russia.  相似文献   
230.
The sectoral production function model of Feder (1983) has been widely used to examine the link between defence spending and economic growth. In this paper, the model, for which too much has been claimed in some past work, is examined, and the case is made for using growth in real non‐defence output rather than growth in real aggregate output (inclusive of military spending) as the dependent variable. Attention is restricted to a small group of OECD countries for which reliable labour force and capital stock (as well as defence) data are obtainable. With non‐defence output as the dependent variable and using only high quality data, no evidence in favour of the underconsumptionist (as opposed to the defence as a burden) position is found.  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