全文获取类型
收费全文 | 3592篇 |
免费 | 150篇 |
国内免费 | 5篇 |
专业分类
3747篇 |
出版年
2021年 | 46篇 |
2019年 | 91篇 |
2018年 | 57篇 |
2017年 | 90篇 |
2016年 | 87篇 |
2015年 | 72篇 |
2014年 | 72篇 |
2013年 | 748篇 |
2012年 | 42篇 |
2010年 | 55篇 |
2009年 | 49篇 |
2008年 | 65篇 |
2007年 | 61篇 |
2006年 | 41篇 |
2005年 | 46篇 |
2004年 | 64篇 |
2003年 | 46篇 |
2002年 | 59篇 |
2001年 | 38篇 |
2000年 | 38篇 |
1999年 | 50篇 |
1998年 | 54篇 |
1997年 | 66篇 |
1996年 | 72篇 |
1995年 | 52篇 |
1994年 | 69篇 |
1993年 | 72篇 |
1992年 | 62篇 |
1991年 | 79篇 |
1990年 | 44篇 |
1989年 | 73篇 |
1988年 | 83篇 |
1987年 | 70篇 |
1986年 | 72篇 |
1985年 | 65篇 |
1983年 | 42篇 |
1982年 | 43篇 |
1981年 | 46篇 |
1980年 | 51篇 |
1979年 | 46篇 |
1978年 | 49篇 |
1977年 | 45篇 |
1976年 | 46篇 |
1975年 | 47篇 |
1974年 | 53篇 |
1973年 | 50篇 |
1972年 | 52篇 |
1971年 | 43篇 |
1970年 | 41篇 |
1969年 | 40篇 |
排序方式: 共有3747条查询结果,搜索用时 6 毫秒
421.
Edward G. Keating 《Defence and Peace Economics》2013,24(2):191-223
This paper models and simulates a government‐contractor principal‐agent weapon system repair model. Insights are derived as to how government repair contracts should be constructed so as to induce optimal contractor behavior. The paper's general conclusion is that the best contracting approach combines a lump‐sum payment that does not vary with the number of units repaired, expensive item cost‐sharing, and a contractor‐provided availability guarantee. Provided there is intercontractor competition, this type of contract performs well even if the government is poorly informed about weapon system break patterns or repair costs. 相似文献
422.
Bryan R. Early 《The Nonproliferation Review》2013,20(2):259-280
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
423.
424.
Lani Miyoshi Sanders Sharon M. DeLand Arian L. Pregenzer 《The Nonproliferation Review》2013,20(3):475-489
In his 2009 Prague speech and the 2010 Nuclear Posture Review, President Barack Obama committed the United States to take concrete steps toward nuclear disarmament while maintaining a safe, secure, and effective nuclear deterrent. There is an inherent tension between these two goals that is best addressed through improved integration of nuclear weapons objectives with nuclear arms control objectives. This article reviews historical examples of the interaction between the two sets of objectives, develops a framework for analyzing opportunities for future integration, and suggests specific ideas that could benefit the nuclear weapons enterprise as it undergoes transformation and that could make the future enterprise compatible with a variety of arms control futures. 相似文献
425.
426.
Douglas B. Shaw 《The Nonproliferation Review》2013,20(3):357-363
The Middle East is a crucial region for the global nonproliferation regime. In 2010, the state parties to the Treaty on the Non-Proliferation of Nuclear Weapons proposed a conference on a Middle East Weapons of Mass Destruction-Free Zone. The nuclear weapon-free zone model, on which this idea builds, has achieved important results in other regions, but faces especially stark challenges in the Middle East. However, the attempt to apply the boldly imaginative zone approach to the Middle East holds promise for building a more inclusive dialogue on nonproliferation and regional security. 相似文献
427.
Governments are increasingly recognizing the problem posed by internally weak nuclear-capable states. The problem, however, is under-theorized. This article brings together literature on sovereignty and international order, the nonproliferation regime, and weak states, and introduces new concepts to provide a more structured understanding of this problem. Insight comes from focusing attention on the function and governance of two nuclear estates (termed the production and operational estates), and on their resilience to decay and disorder occurring within the state and society. Drawing on empirical observation, the authors suggest a typology of weakness in nuclear states, involving state fragmentation typified by the former Soviet Union, the “hard weak state” typified by North Korea, and the internally conflicted state typified by Pakistan. Although these types give rise to distinctive difficulties, their alleviation depends heavily on the maintenance of internal authority within the state and estates, the presence or absence of cooperative relations, and the international regulatory framework's vitality. 相似文献
428.
International safeguards is the system of measures put in place by the International Atomic Energy Agency and states to ensure nuclear programs remain dedicated to peaceful purposes. This international safeguards system consists of agreements, inspections, and evaluations that have never considered the safeguards culture of a state or facility. Neither a common definition nor an understanding of safeguards culture is internationally recognized. This article provides an analysis of the concept of safeguards culture and gauges its value to the international safeguards community. The authors explore distinctions among safeguards culture, safeguards compliance, and safeguards performance, and suggest possible indicators of safeguards culture and methods to promote a strong, positive safeguards culture. 相似文献
429.
430.
James J. Wirtz 《The Nonproliferation Review》2013,20(3-4):333-335