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   330篇
  免费   105篇
  国内免费   16篇
  2024年   2篇
  2023年   3篇
  2022年   4篇
  2021年   11篇
  2020年   4篇
  2019年   8篇
  2018年   7篇
  2017年   14篇
  2016年   26篇
  2015年   15篇
  2014年   26篇
  2013年   22篇
  2012年   21篇
  2011年   41篇
  2010年   15篇
  2009年   16篇
  2008年   16篇
  2007年   22篇
  2006年   27篇
  2005年   21篇
  2004年   18篇
  2003年   13篇
  2002年   19篇
  2001年   17篇
  2000年   9篇
  1999年   13篇
  1998年   7篇
  1997年   6篇
  1996年   7篇
  1995年   4篇
  1994年   3篇
  1993年   2篇
  1992年   5篇
  1991年   2篇
  1990年   2篇
  1989年   2篇
  1988年   1篇
排序方式: 共有451条查询结果,搜索用时 562 毫秒
441.
《刑法修正案(七)》对原刑法规定的侵犯军用标志的犯罪进行了修正,但其规定还存在一些立法疏漏和缺陷,有必要予以改进。《刑法修正案(七)》中的罪名应立法化,由立法机关确定;增设非法生产、伪造、变造、盗窃、抢劫、抢夺、破坏、侮辱武装部队专用标志的行为和伪造、变造、盗窃、非法提供、使用、非法出租、出借、赠送武装部队制式服装的行为;犯罪对象应包括制式服装的标志服饰、军服专用材料和军服仿制品;刑罚种类应增加剥夺政治权利;增加非法生产、买卖武装部队制式服装罪的情节加重犯的法定刑。  相似文献   
442.
有效评估体系贡献度,是武器装备发展论证、作战试验开展和作战使用保障的一项基础性工作。分析了武器装备体系贡献度的概念内涵,构建了武器装备体系贡献度评估指标体系,给出了基于粗糙集的武器装备体系贡献度评估模型与步骤,并进行了算例评估与验证分析。研究工作表明,粗糙集评估法较好地解决了评估数据少、模糊或者不确定的问题,对难以完全量化系统的武器装备体系贡献度评估提供了新的解决思路与具体方法。  相似文献   
443.
西域这一特殊的地理区域,各历史时期所显现的乐舞文化特色,都与社会意识形态的不断变化、民族间的融合以及丝绸之路的繁盛有着密切的关系,特殊的生态环境不仅孕育了独特的具有顽强生命力的乐舞文化形态,更丰富了西域民族乐舞文化的精神内涵。  相似文献   
444.
针对防空作战中电子对抗异常激烈的现实,利用概率论和作战运筹方法,描述了电子干扰对防空兵群射击指挥效率影响的主要特点和评估指标,分析了射击指挥方式与群抗击效率之间的数学关系,建立了搜索雷达、通信系统和火控雷达受到电子干扰时群射击指挥效率的评估模型.结合实例计算,得到了电子干扰对群射击指挥效率影响的基本规律,提出了电子干扰时选择射击指挥方式的原则与方法.  相似文献   
445.
In this paper, I critically analyse the doctrine of the Responsibility to Protect (RtoP), as it relates to the responsibility of intervening forces towards the people they claim to protect and the challenges that the situation in Libya now poses in the region and for the African Union (AU). I focus most of my attention on the coercive elements of the RtoP framework (Pillar III). This is the most contested element in the framework. Three questions guide this article: were there legitimate grounds to justify an external intervention in Libya? In the words of Hugh Roberts in Who Said Gaddafi Had to Go, ‘[w]hat if anything has Libya got in exchange for all the death and destruction that have been visited on it’ since 2011? What are the practical implications and consequences of the North Atlantic Treaty Organization (NATO) intervention, led by the United States (US), for regional peace? I discuss the problems surrounding the US–NATO intervention, followed by an analysis of the various positions and narratives leading up to the intervention, the framing and justifications provided for the intervention, and an analysis of the AU's proposal for the resolution of the Libyan crisis. I analyse the various debates that took place in the US (Pentagon/White House), at the United Nations, among scholars in the West and in Africa, and among various actors who tried to broker a ceasefire in Libya before and during the intervention. I conclude with a discussion of the implications for regional peace.  相似文献   
446.
李志刚 《国防科技》2020,41(4):101-105
招标采购因其管理规范性和采购过程的透明性,逐渐成为我国军事装备采购的主要方式之一。国家军事法规和规章规范了公开招标和邀请招标两种军事装备招标采购方式。本文对我国部分军事法规和军事规章中的军事装备邀请招标相关法律规范进行了梳理,并通过与我国招标投标法、招标投标法实施条例等法律法规的对照分析,发现目前我国相关军事法规和军事规章中关于军事装备邀请招标采购的对象数量的相关规定与我国招标投标法存在不一致之处,其规定本身也存在不尽完善之处。最后,根据我国立法体系,提出应按照招标投标法的规定,进一步完善我国军事法规和军事规章中邀请招标的相关法律规范,以更好地提升军事装备采购的质量,推进我国国防和军队现代化建设。  相似文献   
447.
离子束加工误差对散射损失的影响研究   总被引:1,自引:0,他引:1  
离子束加工(Ion Beam Figuring,IBF)去除函数对加工残差具有重要的影响,而加工残差引起的表面散射则导致光学性能发生变化.为了减小加工残差对光学性能的影响,利用基于CCOS成形原理的离子束加工仿真程序对光学镜面进行修形,分析不同去除函数宽度对散射损失(Ratio of Scattering Loss,RSL)指标的影响.通过研究可知,随着去除函数宽度的减小,加工残差对散射损失的影响越来越小.因此,根据加工残差对RSL指标的影响程度以及RSL指标要求,可以合理选择去除函数宽度,从而在满足面形精度的同时,优化加工工艺.  相似文献   
448.
The signature of a system with independent and identically distributed (i.i.d.) component lifetimes is a vector whose ith element is the probability that the ith component failure is fatal to the system. System signatures have been found to be quite useful tools in the study and comparison of engineered systems. In this article, the theory of system signatures is extended to versions of signatures applicable in dynamic reliability settings. It is shown that, when a working used system is inspected at time t and it is noted that precisely k failures have occurred, the vector s [0,1]nk whose jth element is the probability that the (k + j)th component failure is fatal to the system, for j = 1,2,2026;,nk, is a distribution‐free measure of the design of the residual system. Next, known representation and preservation theorems for system signatures are generalized to dynamic versions. Two additional applications of dynamic signatures are studied in detail. The well‐known “new better than used” (NBU) property of aging systems is extended to a uniform (UNBU) version, which compares systems when new and when used, conditional on the known number of failures. Sufficient conditions are given for a system to have the UNBU property. The application of dynamic signatures to the engineering practice of “burn‐in” is also treated. Specifically, we consider the comparison of new systems with working used systems burned‐in to a given ordered component failure time. In a reliability economics framework, we illustrate how one might compare a new system to one successfully burned‐in to the kth component failure, and we identify circumstances in which burn‐in is inferior (or is superior) to the fielding of a new system. © 2009 Wiley Periodicals, Inc. Naval Research Logistics, 2009  相似文献   
449.
As a generalization of k‐out‐of‐n:F and consecutive k‐out‐of‐n:F systems, the consecutive k‐within‐m‐out‐of‐n:F system consists of n linearly ordered components such that the system fails iff there are m consecutive components which include among them at least k failed components. In this article, the reliability properties of consecutive k‐within‐m‐out‐of‐n:F systems with exchangeable components are studied. The bounds and approximations for the survival function are provided. A Monte Carlo estimator of system signature is obtained and used to approximate survival function. The results are illustrated and numerics are provided for an exchangeable multivariate Pareto distribution. © 2009 Wiley Periodicals, Inc. Naval Research Logistics 2009  相似文献   
450.
空对地导弹的变结构三维导引律(英文)   总被引:1,自引:0,他引:1  
推导了空对地导弹的三维导引律模型,并设计了针对机动目标的变结构导引律,分析了其制导特性.设计的导引律由于需要的目标信息少,可以便利地应用于实际工程中,数字仿真结果证实了设计的导引律的可行性.  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