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   715篇
  免费   0篇
  715篇
  2021年   11篇
  2020年   8篇
  2019年   25篇
  2018年   14篇
  2017年   19篇
  2016年   17篇
  2015年   15篇
  2014年   13篇
  2013年   156篇
  2011年   7篇
  2009年   8篇
  2008年   7篇
  2007年   7篇
  2006年   7篇
  2005年   12篇
  2004年   9篇
  2003年   8篇
  2002年   8篇
  2001年   7篇
  2000年   9篇
  1998年   10篇
  1997年   17篇
  1996年   9篇
  1995年   9篇
  1994年   14篇
  1992年   11篇
  1991年   22篇
  1989年   9篇
  1988年   9篇
  1987年   20篇
  1986年   12篇
  1985年   11篇
  1984年   6篇
  1983年   10篇
  1982年   9篇
  1981年   6篇
  1980年   11篇
  1979年   12篇
  1978年   11篇
  1977年   10篇
  1976年   9篇
  1975年   10篇
  1974年   13篇
  1973年   16篇
  1972年   7篇
  1971年   7篇
  1970年   10篇
  1969年   7篇
  1968年   7篇
  1967年   7篇
排序方式: 共有715条查询结果,搜索用时 15 毫秒
471.
The structural changes inside the French innovation system have impacted the role of defense firms since the late 1980s. Major changes have affected the defense budget and public R&D funding system in particular. The aim of this article is to understand French defense firms’ repositioning within the National Innovation System (NIS) based on an analysis of their R&D behavior over a long period of time (1987–2010). We show that French defense firms remain major players in the NIS and faced up to these major changes by adapting the funding of their R&D and their research priorities and rolling out new innovation capabilities. Additionally, they developed new innovation models to take advantage of new collaborative partnerships developed for civil and military markets.  相似文献   
472.
James Meernik 《Civil Wars》2015,17(3):318-339
Research on human rights treaties has mostly reached depressingly similar conclusions – that such treaties and their resulting institutions have little or no impact on human rights. The International Criminal Court, however, possesses significant power to investigate and prosecute violations of international law that equip it with potentially more influence than previous human rights regimes. I suggest, however, that the impact of the ICC on human rights is conditioned by signatory governments’ commitment to good governance and acceptance of the role of the ICC in addressing violations of international law. I develop a two-stage model of ICC ratification and human rights abuse that shows that while many states have ratified the ICC Treaty, not all are committed to stopping the crimes under its jurisdiction. Rather, state commitment to human rights depends first on its commitment to the rule of law within its own borders. Second, commitment to human rights depends on states’ willingness to grant the ICC the powers necessary to carry out its mission. Through a number of statistical tests, I find strong support for these hypotheses on states’ human rights and propensity for violence.  相似文献   
473.
What explains the pace at which militaries adopt new technology? We argue that the hierarchical structure and unique expertise requirements of military organizations combine to empower select individuals as ‘gatekeepers’ of innovation. These individuals acquire beliefs throughout their military careers regarding the nature and means of warfare that act to shape their attitudes towards new military innovations. By filtering, sidelining, and ignoring competing sources of advice and information, these officers actively inhibit the adoption of new, often advantageous, innovations. We develop this argument through the analysis of two cases: the delayed acquisition of breech-loading and repeating rifles by the Union Army during the American Civil War, and the failure of the US Army to adopt an adequate heavy-type tank in World War II.  相似文献   
474.
The United States faces a series of strategic and policy conundrums as it attempts to promote strategic stability in the Persian Gulf and the wider Middle East. This article examines the relationship between a reduced US nuclear arsenal and strategic stability in the Persian Gulf and the Middle East. It argues that a series of interrelated political and military factors play a much more significant role in regional security and stability than the US strategic arsenal, which has never, with a few extraordinary exceptions, played a direct role in maintaining regional security. The United States has constructed a system of regional stability based on conventional deterrence and defense that has seen it forward base forces at various installations in the region in combination with efforts to arm, train, and equip host-nation militaries. Nuclear weapons have never played a prominent role in this regional system. Evidence presented in this article suggests that there is no compelling reason for the United States to abandon and/or modify the defensive system of conventional deterrence and defense by adding nuclear-backed guarantees to the mix.  相似文献   
475.
476.
477.
478.
Book review     
Tritium on ice: the dangerous new alliance of nuclear weapons and nuclear power by Kenneth D. Bergeron  相似文献   
479.
480.
International Atomic Energy Agency (IAEA) safeguards are under more stress today than at any time in their history. Compliance concerns, a shortage of resources and technology, and growing responsibilities threaten to undermine the effectiveness and credibility of this vital and fundamental pillar of the nonproliferation regime. To address this challenge, the United States recently launched the Next Generation Safeguards Initiative. The goal of this initiative is to ensure the IAEA makes the fullest possible use of its existing authority to prevent the diversion of safeguarded material and to investigate suspicious activities. The initiative will advance state-of-the-art technology, foster the development of a new generation of safeguards experts, and promote technology collaborations and safeguards-conscious infrastructure in states using or pursuing nuclear power. Although it has a domestic focus, the initiative's intent is to catalyze a much broader commitment to international safeguards in partnership with other governments and the IAEA.  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