全文获取类型
收费全文 | 553篇 |
免费 | 54篇 |
国内免费 | 4篇 |
出版年
2021年 | 16篇 |
2019年 | 21篇 |
2018年 | 10篇 |
2017年 | 12篇 |
2016年 | 13篇 |
2015年 | 18篇 |
2014年 | 11篇 |
2013年 | 101篇 |
2011年 | 9篇 |
2010年 | 6篇 |
2009年 | 16篇 |
2008年 | 8篇 |
2007年 | 11篇 |
2006年 | 7篇 |
2005年 | 14篇 |
2004年 | 9篇 |
2003年 | 7篇 |
2002年 | 7篇 |
2001年 | 6篇 |
2000年 | 7篇 |
1999年 | 16篇 |
1998年 | 13篇 |
1997年 | 21篇 |
1996年 | 11篇 |
1995年 | 8篇 |
1994年 | 13篇 |
1992年 | 7篇 |
1991年 | 14篇 |
1990年 | 8篇 |
1989年 | 8篇 |
1988年 | 7篇 |
1987年 | 14篇 |
1986年 | 8篇 |
1985年 | 8篇 |
1983年 | 8篇 |
1982年 | 9篇 |
1980年 | 8篇 |
1979年 | 11篇 |
1978年 | 7篇 |
1977年 | 9篇 |
1976年 | 7篇 |
1975年 | 7篇 |
1974年 | 7篇 |
1973年 | 12篇 |
1972年 | 6篇 |
1971年 | 6篇 |
1970年 | 7篇 |
1969年 | 6篇 |
1968年 | 5篇 |
1967年 | 5篇 |
排序方式: 共有611条查询结果,搜索用时 15 毫秒
101.
Chris M.A. Kwaja 《African Security Review》2013,22(2):153-161
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
102.
Harald Müller 《The Nonproliferation Review》2013,20(3):545-565
In two landmark articles, longtime scholars Kenneth N. Waltz and Thomas C. Schelling have re-emphasized the utility of nuclear deterrence over nuclear nonproliferation (Waltz) and nuclear disarmament (Schelling). While the thrust of the articles is seemingly different, both are rooted in the same intellectual ground: an epistemology that assumes problem-free inferences, drawn from past experiences, are applicable in future scenarios; a foundational rooting in strategic rationality that entangles them in unsolvable contradictions concerning comparable risks of different nuclear constellations, namely deterrence versus proliferation and disarmament; and a bias in framing the empirical record that makes nuclear deterrence more conducive to security than nuclear disarmament. The common normative-practical denominator, then, is to let a nuclear weapon-free world appear both less desirable and less feasible than it might actually be. 相似文献
103.
针对装备维修工程实际中多重故障并发的问题,假设系统经历两个相互独立的劣化故障过程,设定相应的预防性维修阈值并定期对系统状态进行检测;基于Gamma过程建立了该系统的视情维修决策优化模型,给出了系统在预定维修策略下的长期运行费用率计算表达式,并以系统长期运行费用率最低为目标,对检测周期和两个维修阈值进行优化。通过算例分析了维修策略参数对于长期运行费用率及预防性维修概率的影响。计算结果表明:在给定模型参数下,存在一组最优维修策略参数(检测周期和维修阈值),能够使得系统长期运行费用率降至最低。 相似文献
104.
Manuel Acosta Daniel Coronado Esther Ferrandiz M. Rosario Marin Pedro J. Moreno 《Defence and Peace Economics》2013,24(7):821-839
AbstractThis paper examines the generation of technological knowledge by leading companies in the defence industry. In particular, we test whether the characteristics of large defence companies are related to both the production of different types of patents (civilian, military and mixed), and the generation of dual-use technologies. To explore these links, we rely on economic data for the top 100 defence companies from the Stockholm International Peace Research Institute database, and patent information from the Worldwide Patent Statistical Database. Our results show that the relationship between the production of civilian patents and the size of the company is positive and significant. However, this relationship does not hold for the production of military patents. Furthermore, the military commercial profile is unrelated to the generation of military patents. Regarding the involvement in dual-use technologies, firms engaged in dual-use are those with higher military sales, a greater number of employees and a larger number of patents (civilian, military and mixed) than those not engaged in dual-use. Furthermore, we found a skill effect (more involvement in dual-use per employee) in European firms compared to US firms. These findings help to identify which firms should be targeted by government policies if increasing dual-use technologies becomes a political objective. 相似文献
105.
We have used the Michigan Model of World Production and Trade to assess the impact of exports and imports of armaments (based on 1980 data) on sectoral trade and employment and other economic variables in the major Western trading countries. If the United States were to place a unilateral embargo on its arms exports and imports, we calculate that it would experience a comparatively small amount of employment displacement in the aggregate and that most of this displacement would occur in the transport equipment and electric machinery sectors. If all the major Western countries were to place a multilateral embargo on their arms trade, the sectoral effects on the United States would be similarly small. But the sectoral effects in several other industrialized and developing countries measured as a percentage of sectoral employment, would be larger, indicating potential short‐run adjustment problems in labor markets in some cases. 相似文献
106.
107.
108.
In this paper, we examine the current state of knowledge in the economics literature on the conduct of reconstruction activities in Iraq and Afghanistan. As stabilisation and reconstruction missions grow in importance for units deployed to these regions, it becomes more important to understand what activities can promote economic growth at the local level. While military operations focus on interdicting the insurgency, successful counter-insurgency campaigns have typically addressed the conditions conducive to the insurgency. Mitigating the incentives for individuals to participate in an insurgency is imperative. Well-crafted and timed reconstruction activities can, we argue, attenuate these incentives. 相似文献
109.
Sean M. Maloney 《Small Wars & Insurgencies》2013,24(2):404-408
The belief that the insurgency in southern Afghanistan is a singular entity and the assumption that negotiations with that entity can bring an end to the conflict are simplistic and do not take into account the other insurgent partners, nor the role of local power brokers. Care must be taken when providing advice in the public domain on how to end or limit conflict in Afghanistan. 相似文献
110.