全文获取类型
收费全文 | 358篇 |
免费 | 126篇 |
国内免费 | 7篇 |
专业分类
491篇 |
出版年
2023年 | 1篇 |
2022年 | 2篇 |
2021年 | 11篇 |
2020年 | 2篇 |
2019年 | 6篇 |
2018年 | 3篇 |
2017年 | 7篇 |
2016年 | 12篇 |
2015年 | 20篇 |
2014年 | 16篇 |
2013年 | 69篇 |
2012年 | 11篇 |
2011年 | 11篇 |
2010年 | 11篇 |
2009年 | 16篇 |
2008年 | 14篇 |
2007年 | 31篇 |
2006年 | 11篇 |
2005年 | 21篇 |
2004年 | 7篇 |
2003年 | 11篇 |
2002年 | 10篇 |
2001年 | 8篇 |
2000年 | 12篇 |
1999年 | 28篇 |
1998年 | 18篇 |
1997年 | 27篇 |
1996年 | 16篇 |
1995年 | 13篇 |
1994年 | 10篇 |
1993年 | 10篇 |
1992年 | 5篇 |
1991年 | 6篇 |
1990年 | 7篇 |
1989年 | 6篇 |
1988年 | 4篇 |
1987年 | 7篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1983年 | 4篇 |
1982年 | 2篇 |
1977年 | 1篇 |
排序方式: 共有491条查询结果,搜索用时 15 毫秒
261.
Uri Bar‐Joseph 《战略研究杂志》2013,36(3):46-66
According to common wisdom, the Golan provides Israel with an ideal platform for its warning stations as well as the best available defense line against a massive Syrian ground attack. Challenging this belief, this article compares the present situation with an alternative defined by (a) a complete Israeli withdrawal from the Golan, (b) a complete demilitarization of the evacuated territory, and (c) considerable limitations on Syrian military presence in the area between the Golan and Damascus. The article reaches two conclusions. First, that a combination of means, primarily airborne and space‐based platforms, can effectively answer Israel's northern intelligence needs. Second, the security arrangements set above, combined with recent revolutionary military technologies and its relative advantage in this domain, offer Israel an effective ‐ in some respects even a better ‐ alternative, to the present defense line. 相似文献
262.
263.
建筑物内部电场强度分布特性数值模拟研究 总被引:1,自引:0,他引:1
为解决建筑物内部空间电场强度分布难以量化的问题,采用时域有限差分(FDTD)法,对以平面波为激励源,二阶Mur收边界条件的闭合规则建筑物、非规则加窗建筑物和含钢筋非规则加窗建筑物3种模型结构内部电场强度分布特性进行模拟,并通过FEKO软件对计算结果的有效性进行验证。结果表明:普通混凝土材质的建筑物对平面波电场几乎无屏蔽效能;吸波混凝土材质的建筑物对平面波电场的屏蔽效能也较为有限,且随激励源频率的增加,在建筑开窗区域附近的谐振性增强,屏蔽性减弱;通过对植入钢筋墙体建筑物采用细线FDTD法的场强分布计算,证明金属钢筋可提高建筑围护结构的屏蔽效能。 相似文献
264.
David A. Charters Sam C. Sarkesian Daniel W. Fitz‐Simons 《Small Wars & Insurgencies》2013,24(2):280-286
A. Hamish Ion and E.J. Errington (eds.), Great Powers and Little Wars: the Limits of Power. Westport, CT: Praeger, 1993. Pp.246, select biblio, index. $49.95. ISBN 0275–93965–0 John M. Rothgeb, Jr., Defining Power: Influence and Force in the Contemporary International System. New York: St. Martin's Press, 1993. Pp.205. $39.95 (hbk); $18.70 (pbk). ISBN 0312–086–822 and 061–056 Brian L. Job (ed.), The Insecurity Dilemma: National Security in Third World States. Boulder, CO: Lynne Rienner Publishers, 1992, Pp.257. $37. ISBN 1–55587–267–0 Edwin G. Corr and Stephen Sloan (eds.), Low‐Intensity Conflict: Old Threats in a New World. Westview Studies in Regional Security, Boulder, CO: Westview, 1992. Pp.310, maps, figures, index. $55 (hbk); $18.85 (pbk). ISBN 0–8133–8593–8 and 8594–6 相似文献
265.
In this paper, we study the problem of scheduling quay cranes (QCs) at container terminals where incoming vessels have different ready times. The objective is to minimize the maximum relative tardiness of vessel departures. The problem can be formulated as a mixed integer linear programming (MILP) model of large size that is difficult to solve directly. We propose a heuristic decomposition approach to breakdown the problem into two smaller, linked models, the vessel‐level and the berth‐level models. With the same berth‐level model, two heuristic methods are developed using different vessel‐level models. Computational experiments show that the proposed approach is effective and efficient. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2006 相似文献
266.
Myerson 3 and 4 proposed and characterized a modification of the Shapley value in the context of communication situations. In this paper we propose several characterizations of the extension of the Banzhaf value proposed by Owen 7 to communication situations. In particular we characterize this value with the properties of fairness, isolation, and pairwise merging. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006 相似文献
267.
人民军队的性质及其军队党组织的地位和作用,决定了必须把加强思想政治建设,坚持党对军队绝对领导不动摇,作为军队党组织能力建设的首要任务.在新的历史条件下,提高军队党组织思想政治建设本领的关键在于适应新形势,把坚持党对军队绝对领导推进到新阶段;解决新问题,把坚持党对军队绝对领导提高到新水平. 相似文献
268.
The significance of integrating reliability into logistics performance has been established [The Logistics Performance Index and Its Indicators, World Bank International Trade and Transport Departments, (2010)]. Hence, as a response to the work by the World Bank, the present article aims to evaluate the performance index Rb,d of logistics systems as the probability that a specified demand d can be distributed successfully through multistate arc capacities from the source to the destination under the constraint that the total distribution cost should not exceed the cost limitation b. This article provides a pioneering approach for a straightforward computation of the performance index Rb,d. The proposed algorithm is a hybrid between the polynomial time capacity‐scaling algorithm, which was presented by Edmonds and Karp [JACM 19 (1972)], and the decomposition algorithm, which was presented by Jane and Laih [IEEE (2008)]. Currently, the proposed approach is the only algorithm that can directly compute Rb,d. An illustration of the proposed algorithm is presented. The results of the computational experiments indicate that the presented algorithm outperforms existing algorithms. © 2012 Wiley Periodicals, Inc. Naval Research Logistics, 2012 相似文献
269.
We consider a simple two‐stage supply chain with a single retailer facing i.i.d. demand and a single manufacturer with finite production capacity. We analyze the value of information sharing between the retailer and the manufacturer over a finite time horizon. In our model, the manufacturer receives demand information from the retailer even during time periods in which the retailer does not order. To analyze the impact of information sharing, we consider the following three strategies: (1) the retailer does not share demand information with the manufacturer; (2) the retailer does share demand information with the manufacturer and the manufacturer uses the optimal policy to schedule production; (3) the retailer shares demand information with the manufacturer and the manufacturer uses a greedy policy to schedule production. These strategies allow us to study the impact of information sharing on the manufacturer as a function of the production capacity, and the frequency and timing in which demand information is shared. © 2003 Wiley Periodicals, Inc. Naval Research Logistics, 2003 相似文献
270.
分析了影响舰艇主动力装置选型的诸要素,考虑了其间的联系与制约,提出了主动力装置选型的综合评价体系与方法. 相似文献