全文获取类型
收费全文 | 685篇 |
免费 | 114篇 |
国内免费 | 57篇 |
出版年
2024年 | 2篇 |
2023年 | 3篇 |
2022年 | 9篇 |
2021年 | 15篇 |
2020年 | 13篇 |
2019年 | 16篇 |
2018年 | 11篇 |
2017年 | 29篇 |
2016年 | 36篇 |
2015年 | 24篇 |
2014年 | 47篇 |
2013年 | 61篇 |
2012年 | 59篇 |
2011年 | 61篇 |
2010年 | 40篇 |
2009年 | 71篇 |
2008年 | 33篇 |
2007年 | 47篇 |
2006年 | 55篇 |
2005年 | 42篇 |
2004年 | 34篇 |
2003年 | 28篇 |
2002年 | 14篇 |
2001年 | 20篇 |
2000年 | 18篇 |
1999年 | 9篇 |
1998年 | 8篇 |
1997年 | 5篇 |
1996年 | 8篇 |
1995年 | 7篇 |
1994年 | 3篇 |
1993年 | 6篇 |
1992年 | 2篇 |
1991年 | 8篇 |
1990年 | 10篇 |
1989年 | 2篇 |
排序方式: 共有856条查询结果,搜索用时 15 毫秒
761.
损伤定位流程制定的合理与否是衡量一个评估员水平高低的重要指标之一。对损伤定位流程的评价涉及到所用时间、工具、操作的难度等指标都可以用其复杂性来表示,目前鲜有关于损伤定位流程评价的研究,因此提出战场损伤定位流程的复杂性,并借鉴软件工程领域的程序复杂性量化方法——图熵法对其进行量化。经过数据验证,复杂性与评估时间之间存在较好的拟合关系,并用实例说明了模型的应用效果。 相似文献
762.
763.
潘学萍 《武警工程学院学报》2013,(5):93-95
当前,军队院校的政治理论课教学,以教员课堂讲授为主,重课堂理论教学、轻社会实践锻炼的现象比较严重。这种传统的教学模式不利于创新型人才培养和教育转型的需要。政治理论课必须向基地教学延伸。 相似文献
764.
Abdurrahim Sıradağ 《African Security Review》2013,22(3-4):308-325
ABSTRACTTurkey has maintained its strategic relations with Africa at the highest level under recent AK Party governments in the field not only of low politics but also of high politics. For example, it opened its largest overseas military base in Somalia in 2017 and signed military, defense and security pacts with more than 25 African countries. This article traces the deep historical and cultural relations with Africa behind its newly evolving foreign policy identity, arguing that its booming economic power has been a significant driving force in shaping a new security strategy. It examines what the growing security involvement means for both Turkey and Africa in order to contribute to the relevant literature through a holistic approach from both theoretical and conceptual perspectives. 相似文献
765.
Nancy W. Gallagher 《The Nonproliferation Review》2013,20(3-4):469-498
ABSTRACTSince the end of the Cold War, arms control proponents tried to make the case for deep nuclear reductions and other forms of security cooperation as necessary for strategic stability. While different versions of strategic stability analysis did sometimes produce innovative proposals, constructive negotiations, and successful ratification campaigns in the past, this analytical framework has become more of a hindrance than a help. Treating arms control as a predominantly technical way to make deterrence more stable by changing force structure characteristics, military operations, relative numbers of weapons on either side, or total number of nuclear weapons gives short shrift to political factors, including the fundamental assumptions about world politics that inform different arms control logics, the quality of political relations among leading states, and the political processes that affect negotiation, ratification, and implementation. This article compares two logics for arms control as a means to enhance strategic stability, one developed by the Cambridge community in the 1960s and one used by the Reagan administration and its successors, with current perspectives on strategic stability in which flexibility and freedom of action are preferable to predictability and arms control. It also contrasts what the Barack Obama administration has tried to achieve through strategic stability dialogues with Russia and China with how they envision security cooperation. It then presents an approach developed during the Cold War by Hedley Bull for thinking about both the technical and the political dimensions of arms control, and suggests that the logic of Cooperative Security (which shares important features with Bull's approach) is a more appropriate and productive way to think about arms control in the twenty-first century than strategic stability analysis is. 相似文献
766.
J. Thomas Moriarty 《Small Wars & Insurgencies》2013,24(3):476-497
The purpose of this paper is to provide a better conceptualization of insurgent strategies. Specifically, I shall examine Che Guevara's ‘Foco’ theory of insurgency, as it is one of the most theoretically popular and most pervasive strategies of insurgency currently practiced throughout the world. After briefly examining the origins, objectives, and theoretical strengths of the Foco theory (also known as the Vanguard Theory), I will argue that Guevara's theory suffers from an internal tension that I term the ‘Vanguard's Dilemma’. The significance of this dilemma creates a tension within the Vanguard Theory that can be fatal for insurgents if properly exploited by counterinsurgent operations. This paper will examine in detail this dilemma and show how it can be exploited. Given that several insurgent groups within Iraq and Afghanistan currently adhere to the Vanguard Theory of insurgency, a proper understanding of this insurgent strategy is an essential first step in the long road towards confronting and winning asymmetrical conflicts. 相似文献
767.
Stephen Pampinella 《Small Wars & Insurgencies》2013,24(5):721-743
As US counterinsurgency campaigns draw to a close, doctrine for asymmetric warfare written during the War on Terror has come under heavy criticism. While many have argued that this shift to ‘winning hearts and minds’ is evidence that the United States is taking humanitarianism and nation-building seriously, others argue that a wide gap exists between US counterinsurgency doctrine and the protection of civilians afflicted by conflict. In this article, I show that the latter is true by comparing theories of instrumental and communicative action to US doctrine for operational design, stability operations, and counterinsurgency. I argue that these texts treat the people as an object to be manipulated for the achievement of pre-determined self-interested strategic goals rather than members of a community that jointly designs operations to fulfill shared objectives. However, US doctrine does contain communicative elements that, if prioritized, would better support humanitarian and state-building objectives otherwise subordinated in the War on Terror. 相似文献
768.
为使单电子晶体管达到实际应用的地步,开展室温条件下相关研究成为必然。从正统理论出发,推导、计算出室温条件下单电子晶体管能否正常工作的库仑岛临界尺寸:存储器件为6.5nm,逻辑器件为1.5nm;本文还推导和计算出单电子晶体管室温下发生能量量子化效应的临界尺寸:4.7nm,并对这3种临界尺寸进行了验证和分析。另外,通过比较分析本文还得出了室温条件下,所有逻辑器件均必须考虑能量量子化效应,所有存储器件应尽量考虑能量量子化效应的结论。分析结果表明,库仑岛临界尺寸的确定对单电子晶体管的实际应用具有重要意义。 相似文献
769.
770.
针对空中观测单站平台对海面、地面目标的测向定位问题,提出一种基于距离伪量测的最小二乘-不敏卡尔曼滤波(LSE-UKF)两阶段滤波算法。首先利用单次的测角信息以及目标离地高度的约束条件计算出目标的距离,采用最小二乘法对距离量进行滤波,得到较为准确的距离量。进一步将滤波所得距离量视为伪量测信息,结合观测所得的角度信息进行不敏卡尔曼滤波。仿真实验表明该算法提高了定位精度并且具有较快收敛速度。 相似文献