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   3026篇
  免费   435篇
  国内免费   201篇
  2024年   2篇
  2023年   12篇
  2022年   26篇
  2021年   41篇
  2020年   35篇
  2019年   64篇
  2018年   64篇
  2017年   107篇
  2016年   125篇
  2015年   78篇
  2014年   255篇
  2013年   317篇
  2012年   202篇
  2011年   275篇
  2010年   220篇
  2009年   253篇
  2008年   208篇
  2007年   221篇
  2006年   174篇
  2005年   163篇
  2004年   161篇
  2003年   129篇
  2002年   74篇
  2001年   94篇
  2000年   48篇
  1999年   53篇
  1998年   31篇
  1997年   31篇
  1996年   33篇
  1995年   25篇
  1994年   30篇
  1993年   22篇
  1992年   20篇
  1991年   18篇
  1990年   25篇
  1989年   12篇
  1988年   11篇
  1987年   2篇
  1975年   1篇
排序方式: 共有3662条查询结果,搜索用时 62 毫秒
971.
Separatist terrorism has been a severe problem for Turkey since the mid-1980s. The conventional wisdom contends that economic deprivation in southeastern Turkey is the fundamental reason for the long-running battle against the Kurdish rebels. Considering that there is limited empirical literature on the roots of terrorism in Turkey, yielding conflicting results about the claim that the main cause of terrorism is deprived economic conditions, this study aims to answer whether there is a causal relationship between income inequality and separatist terrorism in Turkey. To this end, the Global Terrorism Data Base for the period of 1973–2006, two Theil indices of pay inequality as proxy for income inequality, and the vector autoregression and Autoregressive Moving Average (ARMA) methods are utilized. The results support the early findings that income inequality, a particular focus in this paper and an essential indicator of economic deprivation, is not a main cause of escalation of separatist terrorism in Turkey.  相似文献   
972.
In most western countries, there is a strong incentive for defence department budget-holders to expend all of the funds they are authorized to spend in a fiscal year. In this paper, we question whether this emphasis makes sense. We develop a model of a defence department’s operating expenditure assuming a fixed level of funding for a year and uncertain costs. The results of the model suggest that the incentive for departmental managers to expend all authorized funds is inefficient. We explore the implications of the model for the Department of National Defence (DND) in Canada in light of the recent criticism of DND lapsed funding by the Auditor-General of Canada.  相似文献   
973.
对因素权重为实数、因素状态值为模糊数的多因素不确定性决策问题,由实数型状态变权向量导出模糊数状态变权向量,得出模糊数变权公式,建立模糊数变权综合决策模型,最后给出一个应用模糊数变权综合决策模型的实例.  相似文献   
974.
基于数形结合方法以及变量代换方法发现计算卷积公式存在某些不足之处,研究卷积公式的计算方法,给出一种新的确定积分限的方法.该方法直观明了、容易理解和掌握并且可操作性强,有效避免作图和分析图形的繁琐,并举例说明了该应用方法.  相似文献   
975.
In contrast with a widespread perception of Russia as an expansionist power in the Arctic, this article argues that Moscow does not seek military superiority in the region. Rather, Moscow's military strategies in the Arctic pursue three major goals: first, to demonstrate and ascertain Russia's sovereignty over its exclusive economic zone and continental shelf in the region; second, to protect its economic interests in the High North; and third, to demonstrate that Russia retains its great power status and still has world-class military capabilities. The Russian military modernization programs are quite modest and aim at upgrading the Russian armed forces in the High North rather than providing them with additional offensive capabilities or provoking a regional arms race. The Russian ambitions in the Arctic may be high, but they are not necessarily implying the intentions and proper capabilities to confront other regional players by military means. On the contrary, Moscow opts for soft rather than hard power strategy in the Arctic.  相似文献   
976.
Some of the most active arms races are taking place between developed and less developed countries. The inability of less developed countries to compete financially, as well as technologically, with developed countries may be forcing the former to acquire terror weapons (TWP). The Iran–Iraq war in the 1980s and the events of 9/11 proved that the use of TWP is no longer a mere threat; there are several organizations and countries that will not hesitate to use them. This study develops a model of resource allocation in an arms race between a developed country that is characterized by state‐of‐the‐art technology and high GDP, and a less developed country whose technological capability and GDP are much lower. The model is used to predict the optimal mix of weapons of the two countries that are engaged in the arms race. Applying the model to the arms race between Israel and Syria demonstrates its use.  相似文献   
977.

This paper explores some of the key issues associated with the restructuring of the defence industry. A comparison is made between the US and the European Defence Industrial Bases in terms of the drivers for change and the paradigms within which change has taken place. Having shown that some very important differences exist, the paper then explores the approaches that have been adopted for industry consolidation and references them to the academic literature on mergers and acquisitions (M&As) and strategic alliances (SAs). Given that most of the key defence players recognise the need to be global players, the paper presents an argument that the European firms’ experience of operating with a wide range of forms of corporate alliance will serve them in good stead for operating on a global defence scale. US firms, in contrast, have focused largely on M&A activity.  相似文献   
978.
Kovenock and Roberson's (2012a, b) replication of Hausken’s (2008a) equations and parameter restrictions do not enhance our insight into the defense and attack of reliability systems. This reply intends to fill the remaining understanding gaps.  相似文献   
979.
We explore the impact of strategic assessment efforts on military organizations at war. To do so, we construct a model to explore the impact of a principal’s choice among imperfect performance metrics for a military operation. In doing so, the principal must consider both the incentivizing and informational properties of the metric. We show the conditions under which uncertainty regarding the nature of the agent, as well as uncertainty regarding the operational environment, drives a metric choice that induces pathological behavior from the agent. More specifically, a poor metric choice can create an overly optimistic assessment and end up prolonging the conflict. We illustrate the model’s insights in the cases of World War II and the Vietnam War.  相似文献   
980.
Abstract

This paper examines the impact of civil war on military expenditure. We employ two measures of military expenditure: the share of military expenditure in general government expenditure and the logarithm of military expenditures. We would reasonably expect a priori that military expenditure as a share of general government expenditure increases during a civil war and that such increases would taper off over the duration of a civil war. We also explore whether the termination of a civil war induces a decline in the share of military expenditure as a share of the general government expenditure in the short-run. We find evidence the of share of military expenditure increases during a civil war and falls in the year succeeding the end of a civil war, and, in particular, if a war ends in a peace treaty. The level of military expenditures, however, rises during civil wars and does not appear to decline in the short-term after the end of a civil war.  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