全文获取类型
收费全文 | 2727篇 |
免费 | 479篇 |
国内免费 | 199篇 |
出版年
2024年 | 7篇 |
2023年 | 11篇 |
2022年 | 29篇 |
2021年 | 44篇 |
2020年 | 33篇 |
2019年 | 64篇 |
2018年 | 59篇 |
2017年 | 109篇 |
2016年 | 114篇 |
2015年 | 73篇 |
2014年 | 231篇 |
2013年 | 285篇 |
2012年 | 188篇 |
2011年 | 221篇 |
2010年 | 191篇 |
2009年 | 220篇 |
2008年 | 166篇 |
2007年 | 192篇 |
2006年 | 171篇 |
2005年 | 166篇 |
2004年 | 151篇 |
2003年 | 119篇 |
2002年 | 82篇 |
2001年 | 85篇 |
2000年 | 51篇 |
1999年 | 48篇 |
1998年 | 35篇 |
1997年 | 35篇 |
1996年 | 33篇 |
1995年 | 29篇 |
1994年 | 38篇 |
1993年 | 25篇 |
1992年 | 25篇 |
1991年 | 20篇 |
1990年 | 28篇 |
1989年 | 12篇 |
1988年 | 11篇 |
1987年 | 3篇 |
1975年 | 1篇 |
排序方式: 共有3405条查询结果,搜索用时 250 毫秒
251.
252.
253.
254.
利用金属膜电阻设计并制作了用于陡化前沿Marx发生器调试的大功率低电感负载.其阻值约为90Ω,电感约为55nH,基本不具备分散电容.该负载采用线性渐变的圆锥外型结构,有利于减小信号在负载上的反射,配合电容分压器使用能够很好地完成对前沿约为几ns的快前沿高压脉冲的测量.理论估算了该负载的功率容量,并利用PSpice软件模拟了对其进行脉冲方波加载的情况.该负载用于调试陡化前沿的Marx发生器的实验中,获得了幅值约210kV,脉宽近40ns,前沿为5ns的快前沿高压脉冲.多次实验结果表明该负载性能稳定,适用于陡化前沿Marx发生器的调试工作. 相似文献
255.
动态差分逻辑是一种典型的电路级差分功耗攻击(DPA)防护技术.这种技术通过使逻辑门保持恒定的翻转率来降低电路功耗与数据信号之间的相关性.介绍了一种新型的、基于查找表(Look-Up-Table,LUT)结构的动态差分逻辑(LBDL),以及基于这种逻辑的集成电路设计方法.该设计方法仅需在传统的半定制设计流程中添加少量的替换操作就可以实现 ,因而比其他完全需要全定制设计的动态差分逻辑具有更好的实用性.而相对同样适用于半定制实现的动态差分逻辑 WDDL(Wave Dynamic Differential Logic),LBDL逻辑解决了逻辑门翻转时刻与数据信号之间的相关性,从而比WDDL逻辑具有更好的功耗恒定性.实验结果表明,该设计方法能够有效实现具有抗DPA攻击性能的电路. 相似文献
256.
Alejandro M. Rabinovich 《Small Wars & Insurgencies》2019,30(4-5):775-796
ABSTRACT In the decades following independence from Spain, ‘civil wars’ ravaged the newly established polities in South America. Former vice-regal capitals inherited a larger portion of the colonial administration and had larger economic resources and a hegemonic project they were able to have permanent and professional armed forces, capable of leading the offensive and giving battle following the European rules of military art. The central hypothesis of this work is that there is a necessary relationship between the shape of these asymmetrical conflicts, their outcome and the political territorial configuration of each country in post-revolutionary Spanish America. When permanent armies took over from local militias, the capital kept the integrity of its territories and there was a tendency towards political centralization. When this did not happen and the militias managed to find a way to defeat their centralizing enemies, the local powers had an opportunity to renegotiate their participation in the political body, and sought to maintain their independence, which was manifest in federal agreements, otherwise a process of territorial fragmentation began. More than a difference between regular and irregular forces there was one between intermittent, and permanent mobilization. 相似文献
257.
Thomas Waldman 《Defence Studies》2019,19(1):85-105
This paper explores the notion that US efforts to evade the political costs of war paradoxically contribute to the subsequent exacerbation of costs over time. Leaders seek to purchase political capital in the short term by limiting the costs and requirements of military operations, but in doing so cause strategic and political liabilities to mount in the long run. While identification of such behaviour is not new, insufficient attention has been devoted to explaining its causes, dynamics, and manifestations in relation to key decisions on and in war. Evidence derived from studies of recent American discretionary campaigns is analysed to advance an argument with respect to this pattern of self-defeating strategic behaviour. 相似文献
258.
The aim of this paper is to investigate the determinants of international arms transfers in a gravity model framework. By distinguishing between the decision to export arms (extensive margin) and the value of the arms exported (intensive margin), while also considering its interdependence, is what differentiates this paper from previous research. A theoretically justified gravity model of trade augmented with political and security motives is estimated using a two-stage panel data approach for 104 exporting countries over the period from 1950 to 2007. In addition to the usual gravity variables related to the economic mass of the trading countries and the trade cost factors, the model is extended with political and security factors. The level of democracy in both trading partners, political differences between trading partners and voting similarity with the United States in the UN General Assembly of the countries engaged in trade are the main political factors, whereas the existence of conflicts, military pacts, and embargoes are taken as security motives. The key result indicates that both political and security motives are an important determinant of an arms trade, but their effects on the extensive margin of exports (the decision to order a transfer) differs from their effect on the intensive margin (average value of exports). Moreover, the relative importance of the factors under study has changed since 1989. In the post-cold war period, countries that are less democratic are more likely to export arms, military pacts are less relevant and embargoes play a role. 相似文献
259.
Michael H. Clemmesen 《Defense & Security Analysis》2019,35(1):96-97
The article outlines the essential role of free play elements in various types of exercises for the development of in-depth and practical military professionalism. It thereafter argues why such use of free play contradicts the military science founded Russian Way of War. 相似文献
260.
Estimating failure time distribution and its parameters based on intermediate data from a Wiener degradation model 总被引:1,自引:0,他引:1
Instead of measuring a Wiener degradation or performance process at predetermined time points to track degradation or performance of a product for estimating its lifetime, we propose to obtain the first‐passage times of the process over certain nonfailure thresholds. Based on only these intermediate data, we obtain the uniformly minimum variance unbiased estimator and uniformly most accurate confidence interval for the mean lifetime. For estimating the lifetime distribution function, we propose a modified maximum likelihood estimator and a new estimator and prove that, by increasing the sample size of the intermediate data, these estimators and the above‐mentioned estimator of the mean lifetime can achieve the same levels of accuracy as the estimators assuming one has failure times. Thus, our method of using only intermediate data is useful for highly reliable products when their failure times are difficult to obtain. Furthermore, we show that the proposed new estimator of the lifetime distribution function is more accurate than the standard and modified maximum likelihood estimators. We also obtain approximate confidence intervals for the lifetime distribution function and its percentiles. Finally, we use light‐emitting diodes as an example to illustrate our method and demonstrate how to validate the Wiener assumption during the testing. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008 相似文献