全文获取类型
收费全文 | 606篇 |
免费 | 201篇 |
国内免费 | 27篇 |
出版年
2024年 | 3篇 |
2023年 | 6篇 |
2022年 | 8篇 |
2021年 | 15篇 |
2020年 | 21篇 |
2019年 | 31篇 |
2018年 | 20篇 |
2017年 | 64篇 |
2016年 | 56篇 |
2015年 | 35篇 |
2014年 | 57篇 |
2013年 | 92篇 |
2012年 | 48篇 |
2011年 | 35篇 |
2010年 | 39篇 |
2009年 | 41篇 |
2008年 | 24篇 |
2007年 | 32篇 |
2006年 | 34篇 |
2005年 | 30篇 |
2004年 | 31篇 |
2003年 | 17篇 |
2002年 | 12篇 |
2001年 | 18篇 |
2000年 | 16篇 |
1999年 | 8篇 |
1998年 | 4篇 |
1997年 | 8篇 |
1996年 | 6篇 |
1995年 | 4篇 |
1994年 | 6篇 |
1993年 | 3篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 4篇 |
1989年 | 4篇 |
排序方式: 共有834条查询结果,搜索用时 15 毫秒
601.
Wai Ki Ching 《海军后勤学研究》2001,48(1):65-78
This paper studies production planning of manufacturing systems of unreliable machines in tandem. The manufacturing system considered here produces one type of product. The demand is assumed to be a Poisson process and the processing time for one unit of product in each machine is exponentially distributed. A broken machine is subject to a sequence of repairing processes. The up time and the repairing time in each phase are assumed to be exponentially distributed. We study the manufacturing system by considering each machine as an individual system with stochastic supply and demand. The Markov Modulated Poisson Process (MMPP) is applied to model the process of supply. Numerical examples are given to demonstrate the accuracy of the proposed method. We employ (s, S) policy as production control. Fast algorithms are presented to solve the average running costs of the machine system for a given (s, S) policy and hence the approximated optimal (s, S) policy. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 65–78, 2001 相似文献
602.
The routine inspection of facilities storing large numbers of identical items is modeled as a two‐person, sequential game. Timely detection of illegal activity is parameterized in terms of a critical time to detection, and equilibria are derived which provide inspection strategies. Necessary conditions for deterrence of illegal behavior are discussed. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 496–505, 2001 相似文献
603.
提出了近似计算单发命中概率的等概率替代法的思路 ,并给出射弹散布误差均值为零情况下的正方形目标与圆形目标之间的等概率替代数学模型 相似文献
604.
用灰色理论GM(1,1)模型预测主动力装置在不同破坏半径下的生命力 总被引:3,自引:1,他引:2
用传统的方法预测主动力装置在不同破坏半径下的生命力 ,存在所需数据量大、不易预测、准确性不高等缺点 .运用灰色理论GM(1,1)模型预测了舰船主动力装置受到武器攻击时在各种破坏半径下的生命力 ,方法简单易行 ,结果准确可靠 ,为决策者进行科学的决策提供了相关的理论依据 相似文献
605.
基于我国2天交会对接方案,通过合理减少定轨、变轨参数计算与指令上传及不可测控区域占用的飞行圈次,建立了5圈快速交会对接的调相变轨方案,采用四脉冲修正特殊点变轨算法进行求解。给出了满足调相段终端控制精度所需要的定轨精度,分析了追踪航天器入轨精度、追踪航天器入轨远地点高度、目标轨道高度、调相段终端瞄准点等参数对最优初始相位角范围的影响规律。简要分析了为获得需要的初始相位角,目标航天器的调相策略及追踪航天器可能的发射机会。 相似文献
606.
A classic problem in Search Theory is one in which a searcher allocates resources to the points of the integer interval [1, n] in an attempt to find an object which has been hidden in them using a known probability function. In this paper we consider a modification of this problem in which there is a protector who can also allocate resources to the points; allocating these resources makes it more difficult for the searcher to find an object. We model the situation as a two‐person non‐zero‐sum game so that we can take into account the fact that using resources can be costly. It is shown that this game has a unique Nash equilibrium when the searcher's probability of finding an object located at point i is of the form (1 − exp (−λixi)) exp (−μiyi) when the searcher and protector allocate resources xi and yi respectively to point i. An algorithm to find this Nash equilibrium is given. © 2000 John Wiley & Sons, Inc. Naval Research Logistics 47:85–96, 2000 相似文献
607.
前苏联发展反卫星武器的回顾 总被引:3,自引:0,他引:3
随着军用卫星的种类变化和性能提高 ,以及为谋求外层空间作战的军事优势 ,前苏联一直在积极发展反卫星武器。介绍了前苏联反卫星武器的组成、特点、技术方案及其发展情况 ,最后归纳了关于前苏联反卫星武器的几点看法。 相似文献
608.
609.
Strategic studies deals intimately with the topic of power. Most scholars in the discipline work with a concept of power as an adversarial zero-sum competition. This is natural and necessary. However, other conceptions of power developed within political science and sociology could enrich strategic studies. Approaching two typical, traditional tasks of strategy – alliance building and war-fighting – this article demonstrates the heuristic mileage of theories of collective power. In particular, we can shed new light on the post-Cold War transformation of NATO as well as state-building as a strategy in counter-insurgencies with new ideas of power. Broadening the palette of theories of power is thus valuable if strategic studies is to prosper as an independent field of study. 相似文献
610.
Murat Caliskan 《Defense & Security Analysis》2019,35(1):40-58
Hybrid warfare is the latest of the terms/concepts that have been used within the defence community in the last three decades to label contemporary warfare. It has been officially adopted in the core strategic documents of NATO, EU and national governments and has already inspired many articles, policy papers and books; however, this paper is unique in the sense that it analysis the hybrid warfare concept through the lens of strategic theory. It is argued that hybrid warfare does not merit the adoption as a doctrinal concept. Strategic theory instead, which lies at the nexus of all dimensions of warfare, provides a better viewpoint to approach contemporary warfare. It concludes that efforts should be directed towards exploring warfare under the light of eternal principles instead of proving the emergence of new types of warfare. 相似文献