全文获取类型
收费全文 | 1892篇 |
免费 | 341篇 |
国内免费 | 110篇 |
出版年
2024年 | 2篇 |
2023年 | 10篇 |
2022年 | 25篇 |
2021年 | 42篇 |
2020年 | 49篇 |
2019年 | 34篇 |
2018年 | 52篇 |
2017年 | 93篇 |
2016年 | 80篇 |
2015年 | 65篇 |
2014年 | 160篇 |
2013年 | 187篇 |
2012年 | 127篇 |
2011年 | 172篇 |
2010年 | 127篇 |
2009年 | 160篇 |
2008年 | 113篇 |
2007年 | 115篇 |
2006年 | 112篇 |
2005年 | 108篇 |
2004年 | 99篇 |
2003年 | 72篇 |
2002年 | 68篇 |
2001年 | 59篇 |
2000年 | 38篇 |
1999年 | 24篇 |
1998年 | 28篇 |
1997年 | 13篇 |
1996年 | 20篇 |
1995年 | 18篇 |
1994年 | 19篇 |
1993年 | 6篇 |
1992年 | 15篇 |
1991年 | 10篇 |
1990年 | 10篇 |
1989年 | 7篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有2343条查询结果,搜索用时 328 毫秒
991.
王国良 《中国人民武装警察部队学院学报》2010,26(9):5-8
大陆和台湾地区同属一个国家--中国.但由于特殊的历史原因,导致了两岸至今的现状,并在人员往来方面采用了各自不同的出入境制度.就两地的出入境制度作一系统的比较,从而发现联系与区别,以便完善大陆出入境法律制度,更好地促进两岸的交流与发展. 相似文献
992.
The article focuses on both economics and spatial issues related to Maintenance Repair and Overhaul (MRO) of defence platforms in Europe. Using facts and figures related to costs, trends and fleet sizes evolution, the authors discuss the interest of a spatial reorganisation of MRO production. Given the fiscal situation of the main European countries with a modern army, the relevant scale to consider the reorganisation is certainly Europe. Through the example of defence helicopters fleets of a selection of European countries, the authors address the question of cooperation of the MRO. A greater cooperation in the support of fleets would lead to a spatial reorganisation of MRO. On one side economies can be expected from this reorganisation, but, on the other hand, new problems arise. Specifically, a number of costs associated with different forms of “distances” – geographical, operational and political distances – limit the potential savings that could be expected. This work provides insights on these important issues for the construction of a European defence, both in its political, military and industrial dimensions. 相似文献
993.
We consider an expansion planning problem for Waste‐to‐Energy (WtE) systems facing uncertainty in future waste supplies. The WtE expansion plans are regarded as strategic, long term decisions, while the waste distribution and treatment are medium to short term operational decisions which can adapt to the actual waste collected. We propose a prediction set uncertainty model which integrates a set of waste generation forecasts and is constructed based on user‐specified levels of forecasting errors. Next, we use the prediction sets for WtE expansion scenario analysis. More specifically, for a given WtE expansion plan, the guaranteed net present value (NPV) is evaluated by computing an extreme value forecast trajectory of future waste generation from the prediction set that minimizes the maximum NPV of the WtE project. This problem is essentially a multiple stage min‐max dynamic optimization problem. By exploiting the structure of the WtE problem, we show this is equivalent to a simpler min‐max optimization problem, which can be further transformed into a single mixed‐integer linear program. Furthermore, we extend the model to optimize the guaranteed NPV by searching over the set of all feasible expansion scenarios, and show that this can be solved by an exact cutting plane approach. We also propose a heuristic based on a constant proportion distribution rule for the WtE expansion optimization model, which reduces the problem into a moderate size mixed‐integer program. Finally, our computational studies demonstrate that our proposed expansion model solutions are very stable and competitive in performance compared to scenario tree approaches. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 47–70, 2016 相似文献
994.
CHENG Hong 《国防科技》2018,39(1):001-004
坚持向科技创新要战斗力,落实到国防动员建设领域,就是要紧紧围绕党在新形势下的强军目标,积极适应现代战争形态新变化、世界军事变革新趋势、总体国家安全新要求和军队使命任务新拓展,加强高技术力量平战一体国防动员,搭建起高技术力量在经济与军事、地方与军队、潜力与实力、平时与战时的桥梁和纽带,全面提升国防动员战时应战、急时应急、平时服务能力,为保障军队能打仗、打胜仗提供强大科技支撑。 相似文献
995.
Ugur Berk 《Defence and Peace Economics》2018,29(5):525-540
Previous studies on the relationship between individual’s enlistment decisions and their personal characteristics examined a number of variables such as age, marital status, gender, family background, geographical background, employment situation and education level. However, attitudes towards working, expectations from a good job and centrality of working are also important determinants in this process. This paper examines the profile of juveniles who seek a career as gendarmerie non-commissioned officers (NCO) in the Turkish Armed Forces and their attitudes and expectations towards working in general within the framework of Meaning of Working (MOW) researches. According to the results of the survey conducted with 500 NCO candidates in Turkey, learning something new, good relations with colleagues and employment guarantee are detected as the main expectations of juveniles who seek a career in military. Results also show that having a job is so important for these young people that they consider having a job even prior to their families. 相似文献
996.
提出了一种能够同时抑制窄带和多址干扰的TDO-MOE盲干扰抑制算法,算法将TDO-LMS算法引入到MOE盲检测算法,克服了TDO算法在盲检测中容易发散的缺点.通过信道估计调整步长因子,信道估计运算利用了检测器的中间运算结果,没有付出多余运算量.仿真结果表明,在维持LMS类算法的SINR性能的前提下,算法明显缩短了收敛时间,具有一定的应用价值. 相似文献
997.
生化恐怖袭击及其应对策略 总被引:1,自引:0,他引:1
肖明艳 《中国人民武装警察部队学院学报》2004,20(3):76-78,82
本文指出了生化恐怖活动发展的历史趋势、分析了大规模生化恐怖活动兴起的原因 ,并分析了恐怖分子获得生化武器的可能性 ,对于可能发生的大规模生化恐怖活动提出了的应对策略 相似文献
998.
王後 《中国人民武装警察部队学院学报》2004,20(5):75-77
期刊编辑选题策划是编辑在信息传播过程中所从事的决策与设计性工作 ,它具有显著的特征 ,应遵循内在的原则。 相似文献
999.
1000.
邢永琴 《兵团教育学院学报》2004,14(2):23-25
新时期,高校思想政治工作将面临新的环境、新的机遇和挑战。高校思想政治工作者认清形势,深入研究新形势下高校改革发展趋势和师生思想特点,努力改进思想政治工作内容、方法和手段,以全面提高思想政治工作队伍素质,以适应新时期高校思想政治工作的新要求。 相似文献