全文获取类型
收费全文 | 574篇 |
免费 | 5篇 |
国内免费 | 7篇 |
出版年
2021年 | 14篇 |
2020年 | 8篇 |
2019年 | 4篇 |
2017年 | 11篇 |
2016年 | 10篇 |
2015年 | 15篇 |
2014年 | 11篇 |
2013年 | 61篇 |
2012年 | 32篇 |
2011年 | 40篇 |
2010年 | 30篇 |
2009年 | 27篇 |
2008年 | 38篇 |
2007年 | 23篇 |
2006年 | 22篇 |
2005年 | 15篇 |
2004年 | 12篇 |
2003年 | 3篇 |
2002年 | 3篇 |
2001年 | 7篇 |
2000年 | 4篇 |
1998年 | 6篇 |
1997年 | 6篇 |
1995年 | 5篇 |
1994年 | 4篇 |
1993年 | 10篇 |
1992年 | 7篇 |
1991年 | 6篇 |
1989年 | 12篇 |
1988年 | 3篇 |
1987年 | 10篇 |
1986年 | 10篇 |
1985年 | 7篇 |
1983年 | 5篇 |
1982年 | 5篇 |
1981年 | 8篇 |
1980年 | 9篇 |
1979年 | 11篇 |
1978年 | 4篇 |
1977年 | 6篇 |
1976年 | 7篇 |
1975年 | 7篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1972年 | 12篇 |
1971年 | 3篇 |
1970年 | 3篇 |
1969年 | 9篇 |
1968年 | 7篇 |
1966年 | 3篇 |
排序方式: 共有586条查询结果,搜索用时 15 毫秒
181.
182.
针对面向无人化陆战的智能指挥控制系统开展研究,并分析其智能化运用方式.从作战样式、作战任务、装备编配4个方面对未来无人化陆战的特征进行分析.从情报数据挖掘、态势融合共享、指挥自主决策等方面,分析了指挥控制系统智能化发展能力需求,建立智能指挥控制系统能力型谱.最后,构建了包含基础层和决策层的智能指挥控制系统架构,在此基础上提出了遵循OODA的智能指挥控制系统模型,并以作战活动视图对智能指挥控制系统的作战活动过程进行描述.通过对智能指挥控制系统能力需求、系统架构以及智能化运用方式的分析研究,可为指挥控制系统智能化发展提供参考和借鉴,为智能指挥控制系统在未来陆战场的合理应用指明了方向与突破口. 相似文献
183.
Kavita Ghosh L.V. Gaikwad R.K. Kalal P.A. Kulkarni Arvind Kumar Shaibal Banerjee Manoj Gupta 《防务技术》2021,17(2):559-570
In the present study,organically modified Montmorillonite clay with polar moiety,the Cloisite 30B,is used for preparation of Hydroxyl terminated polybutadiene(HTPB)-clay nanocomposites(HCN)by dispersion of nanoclay in polymer matrix under high shear mixing.The nanocomposites thus prepared are evaluated in composite propellants as inhibitor material for their functional utility.Several inhibition formulations containing 5 wt%-15 wt%of nanoclay,with or without the conventional filler Sb2O3,were prepared.All these formulations were evaluated for their physical,mechanical,thermal,and ablative properties.Ablation rate and density of the compositions containing Cloisite 30B is around 23%and 5%lower respectively in comparison of the base composition.Strain capability of these compositions is twofold higher than that of base composition.These compositions have also been evaluated for their smoke generation tendency by measuring infra red(IR)attenuation in the wavelength range 1.3 μm-5.6 μm and 8 μm-13 μm and thereby compared with the base composition.The corresponding results confirmed that the compositions containing Cloisite 30B as filler have much lower IR attenuation than compositions with conventional filler,Sb2O3.Replacement of 5%Sb2O3 by nanoclay showed 8%reduction in IR attenuation rate which further reduced to 16%on replacement of 15%of Sb2O3.Interfacial bonding of HCN based inhibitors is also comparable or even better than conventional inhibitors.Precisely,the nanoclay composites with Cloisite 30B as filler exhibit all desirable properties of an inhibitor. 相似文献
184.
Chemical warfare agents (CWA) are stockpiled in large quantities across the globe. Agents stored in inaccessible facilities need to be destroyed rapidly without dispersing the compounds to surrounding areas. Metal-based energetic formulations are used in such prompt defeat applications to rapidly decompose the CWA by generating a high temperature environment. An alternate, and possibly a more effective decomposition pathway could be provided by chemicidal action of aerosolized condensed combustion products, which typically consist of metal oxides. Toxic fumes that escape the high tem-perature blast zone can be neutralized by smoke generated during combustion, depending on the par-ticle size, surface characteristics, chemical properties, and concentration of this smoke. This review considers relevant experimental and modeling studies quantifying decomposition of CWA comprising organophosphorus compounds and their surrogates on the surface of various metal oxides. Dimethyl methylphosphonate (DMMP), a sarine surrogate, was used most commonly for such experiments. Many reported efforts focused on the mechanisms of adsorption of DMMP to various metal oxides and initial reaction steps cleaving various bonds from the chemisorbed molecules. For selected oxides, these ex-periments were supported by quantum-mechanical calculations. In other studies, the capacity of oxide surfaces to adsorb and decompose DMMP was quantified. In most cases, porous catalysts were used although limited experimental data are available for aerosolized nonporous oxide particles. The reported experimental data applicable to scenarios involving prompt decomposition of CWA are summarized. It is noted that information is lacking describing respective heterogeneous reaction kinetics. Preliminary estimates of aerosolized smoke particle concentrations required to destroy CWA are made considering gas phase diffusion rates and reported values of the oxide capacity to decompose CWA or their surrogates. 相似文献
185.
履带车辆转向性能指标分析及实验研究 总被引:4,自引:0,他引:4
转向性能是评价履带车辆机动性的重要指标之一.文中针对转向角速度、转向半径和转向消耗功率3个指标,分别在不考虑履带滑转滑移的理想条件下和考虑履带滑转滑移的实际情况下,对履带车辆的转向性能进行了讨论和分析,对2种条件下履带车辆的转向性能的变化进行了比较.为了对履带车辆在转向过程中履带的滑转和滑移程度进行定量的分析,定义了履带的滑转和滑移系数.通过实车实验,对分析结果进行了验证. 相似文献
186.
基于弹药安全性的运输装载决策系统研究 总被引:1,自引:0,他引:1
对弹药装载决策业务进行了系统分析,研究了各项决策要素,在此基础上研制开发了一种基于弹药安全性的运输装载决策系统,收到了良好的使用效果。 相似文献
187.
装甲机械化部队信息系统体系结构研究 总被引:1,自引:1,他引:0
为确立装甲机械化部队信息系统建设的体系结构,分析了装甲机械化部队信息系统存在的问题,根据装甲机械化部队军事能力需求得出了装甲机械化部队的信息系统的体系结构方案,并就相关问题进行了描述和探讨,可供装甲机械化部队信息系统建设参考。 相似文献
188.
189.
190.