全文获取类型
收费全文 | 1244篇 |
免费 | 4238篇 |
国内免费 | 483篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2022年 | 10篇 |
2021年 | 41篇 |
2020年 | 5篇 |
2019年 | 162篇 |
2018年 | 264篇 |
2017年 | 265篇 |
2016年 | 182篇 |
2015年 | 200篇 |
2014年 | 264篇 |
2013年 | 389篇 |
2012年 | 355篇 |
2011年 | 245篇 |
2010年 | 241篇 |
2009年 | 237篇 |
2008年 | 203篇 |
2007年 | 234篇 |
2006年 | 187篇 |
2005年 | 207篇 |
2004年 | 191篇 |
2003年 | 144篇 |
2002年 | 138篇 |
2001年 | 159篇 |
2000年 | 174篇 |
1999年 | 225篇 |
1998年 | 181篇 |
1997年 | 161篇 |
1996年 | 134篇 |
1995年 | 93篇 |
1994年 | 80篇 |
1993年 | 105篇 |
1992年 | 117篇 |
1991年 | 93篇 |
1990年 | 83篇 |
1989年 | 54篇 |
1988年 | 36篇 |
1987年 | 26篇 |
1986年 | 32篇 |
1985年 | 20篇 |
1983年 | 14篇 |
1982年 | 12篇 |
排序方式: 共有5965条查询结果,搜索用时 14 毫秒
941.
利用Lyapunov-Perron方法在适当的谱间隙条件和适当小的时滞假设下,证明了一类非自伴算子情形下半线性时滞抛物方程惯性流形的存在性。 相似文献
942.
943.
以科学发展观统领国防和军队建设,重在抓基层,打基础上下功。促进军队基层全面建设的科学发展,应该坚持科学理论武装,以正确的观念谋发展;遵循基层建设规律,以科学的思路求发展;优化基层建设环境,以科学的秩序保发展;健全科学评估机制,以科学的标准促发展。 相似文献
944.
刘立祥 《军队政工理论研究》2006,7(2):84-86
提高政治理论课教学质量要重视抓细节。抓细节就是抓质量;抓细节必须贯穿始终。从教学各环节、各要素努力拓展细节的空间,对备课、课堂讲授艺术、教学语言和姿态、教学对象的每一个细节都慎重对待,一以贯之地精心打造好每一个细节。 相似文献
945.
设计安全策略模型时应考虑安全策略的时序特性和灰色特性,还应综合考虑保密性、完整性和可用性三方面的需求。已有的安全模型没有描述时序性和灰色特性,而且一般只侧重描述保密性或完整性。为此,本文提出了动态灰色时序系统(简称DGTS)。本文详细描述了DGTS,以及基于DGTS的动态语义设计的灰色时序安全策略规范语言GTSL。 相似文献
946.
AbstractThis study applies the Sequential Panel Selection Method (SPSM), to investigate the convergence properties of the military expenditure of the North Atlantic Treaty Organization (NATO) during the period of 1990–2015. Compared to the traditional methods, SPSM considers fundamentally general spatial homogeneous and heterogeneous relationships with countries and examines the evolution of military expenditure. We find that four-fifths of NATO member countries have been convergent with the UK, but no country’s military expenditure is convergent with the US. This means that there is no significant linkage effect in the US for NATO military expenditure. While they are allies of the US, the majority of NATO member countries’ military expenditures are consistent with UK military expenditure. The main reasons are due to the geographical space layout and the international relationship convergence. The results indicate that more than four-fifths of NATO member countries have been coordinated with convergence theory and spillover effect. 相似文献
947.
AbstractThe paper examines the relationship between health and military expenditures using pooled cross-sectional (197 countries) and time series (2000–2013) data. Simultaneous equation models were employed to estimate the relationship between an array of public sector expenditures in order to address potential endogeneity. Our empirical findings strongly support the crowding-out hypothesis whereby increased military expenditures reduce the capacity of government to direct expenditures to health expenditures. These findings were robust to alternative specifications explored in the sensitivity analyses. Compared with upper-middle-income countries, the crowding-out effect became more pronounced among lower-middle-income countries. Consequently, this study shows that increased military expenditures negatively impacts health expenditures, and therefore poses as an important risk factor for population health and individual well-being. Moreover, it is the poorest of nations that are most sensitive to the negative effects of increased military expenditures. 相似文献
948.
Xiaohui Wu 《The Nonproliferation Review》2013,20(2):317-338
China-U.S. cooperation over the most difficult security problem in Northeast Asia—the North Korean nuclear issue—in essence projects its bigger power game amid the tectonic shifts of Asian geopolitics. The nuclear issue affords a test case to gauge the future posture of China and the United States in East Asia and their partnership in that conflict-prone region. Approaches to resolving this issue must take into account the geopolitical realignment of Asia, Washington's reorientation of relations with its Asian allies, and China's rise as an influential regional player and the subsequent regional response. However, the long-standing mistrust between China and the United States is contributing to a lack of substantial progress in Korean nonproliferation efforts. The declared nuclear test by Pyongyang further put the denuclearization cooperation between China and the Unites States on the line. China-U.S. cooperation in denuclearizing Pyongyang may either produce lasting stability for the region or create ‘‘collateral damage,’’ with the North Korean issue paling in comparison. 相似文献
949.
为发挥鱼雷的作战效能,提出潜射鱼雷有利相遇态势的概念,指出当一次转角射击不能满足鱼雷以有利相遇态势接近并发现目标时,各种自导方式的鱼雷均需要二次转角射击。在给出二次转角射击时机、解算模型的基础上,着重对预定相遇态势射击的关键----二次转向点的选择问题进行了系统研究,引入基于鱼雷自导探测距离的二次转向点与预定相遇点之间距离的选择方法,使得二次转向点的选择更具合理性和针对性,且适用于包括直航鱼雷在内的各种鱼雷。 相似文献
950.