全文获取类型
收费全文 | 2781篇 |
免费 | 389篇 |
国内免费 | 166篇 |
专业分类
电工技术 | 117篇 |
技术理论 | 1篇 |
综合类 | 251篇 |
化学工业 | 135篇 |
金属工艺 | 160篇 |
机械仪表 | 419篇 |
建筑科学 | 232篇 |
矿业工程 | 6篇 |
能源动力 | 79篇 |
轻工业 | 66篇 |
水利工程 | 5篇 |
石油天然气 | 10篇 |
武器工业 | 223篇 |
无线电 | 404篇 |
一般工业技术 | 477篇 |
冶金工业 | 58篇 |
原子能技术 | 4篇 |
自动化技术 | 689篇 |
出版年
2024年 | 30篇 |
2023年 | 46篇 |
2022年 | 92篇 |
2021年 | 88篇 |
2020年 | 113篇 |
2019年 | 81篇 |
2018年 | 90篇 |
2017年 | 131篇 |
2016年 | 165篇 |
2015年 | 181篇 |
2014年 | 305篇 |
2013年 | 207篇 |
2012年 | 246篇 |
2011年 | 246篇 |
2010年 | 158篇 |
2009年 | 156篇 |
2008年 | 160篇 |
2007年 | 168篇 |
2006年 | 118篇 |
2005年 | 104篇 |
2004年 | 76篇 |
2003年 | 46篇 |
2002年 | 45篇 |
2001年 | 44篇 |
2000年 | 32篇 |
1999年 | 34篇 |
1998年 | 33篇 |
1997年 | 19篇 |
1996年 | 23篇 |
1995年 | 13篇 |
1994年 | 15篇 |
1993年 | 9篇 |
1992年 | 7篇 |
1991年 | 8篇 |
1988年 | 3篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 5篇 |
1983年 | 8篇 |
1982年 | 3篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1974年 | 1篇 |
1965年 | 1篇 |
1962年 | 1篇 |
1960年 | 1篇 |
1958年 | 1篇 |
1957年 | 2篇 |
1956年 | 4篇 |
1955年 | 4篇 |
排序方式: 共有3336条查询结果,搜索用时 15 毫秒
91.
Fault‐tolerant control using command‐filtered adaptive back‐stepping technique: Application to hypersonic longitudinal flight dynamics 下载免费PDF全文
Bin Xu Yuyan Guo Yuan Yuan Yonghua Fan Danwei Wang 《International Journal of Adaptive Control and Signal Processing》2016,30(4):553-577
In this paper, the adaptive back‐stepping controller is investigated for a class of strict‐feedback systems using the command filter technique. Adaptive laws are designed for updating the controller parameters when both the plant parameters and actuator‐failure parameters are unknown. Furthermore, the auxiliary dynamics is developed to deal with the input constraints. Closed‐loop stability and asymptotic‐state tracking are ensured. The method is applied to the longitudinal dynamics of a generic hypersonic aircraft in the presence of actuator faults and input constraints. Based on the parameter estimation, the command‐filtered adaptive back‐stepping control is presented. Simulation results on the control‐oriented model show that the proposed approach achieves good tracking performance. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
92.
釆用高强低伸工业涤纶为原料,加工织造了机织间隔织物,对间隔织物空间进行泡沫填充,面层与树脂进行复合,制成了三明治型复合材料板材。测试了冲击位置不同时复合板材耐冲击性能和冲击前后板材的侧压性能,分析了冲击位置对三明治型复合板材耐冲击性能的影响。结果表明,相同冲击能量作用下,冲击位置不同时,复合板材的表观破坏和冲击后侧压性能均有差异。在间隔织物规格相同的情况下,冲击位置在接结点处的板材表观冲击损伤大,但冲击发生在接结点处的板材受冲击后,所能承受的侧压载荷相对较大。 相似文献
93.
94.
针对耐高温动态热密封组件中的常用元件弹性支架编织弹簧,研究了其压缩率、装配方式、热暴露温度等参数对其弹性性能的影响,并讨论了编织弹簧高温弹性失效的原因。研究结果表明,合金的氧化是编织弹簧高温回弹率降低的主要原因,在温度低于800℃、压缩率小于50%的服役条件下,编织弹簧的回弹率不小于95%,在航天热密封领域有广阔的应用前景。 相似文献
95.
96.
Adaptive trajectory generation based on real-time estimated parameters for impaired aircraft landing
《International journal of systems science》2012,43(15):2733-2751
ABSTRACTThis paper is motivated by a need to address the challenge of securing a safe landing after suffering from inflight impairment. In this paper, a new adaptive generalised model predictive static programming (G-MPSP) is developed to generate a safe emergency landing trajectory for impaired aircraft. Utilising the computationally efficient G-MPSP framework, the proposed algorithm enables adaptation of model parameters based on the prediction errors to ensure reasonable guidance performance. Based on the estimated parameters, a feasible landing trajectory is then generated by the flexible finite-horizon G-MPSP with input constraints. The integrated approach features explicit closed-form solutions for both parameter estimation and trajectory generation. Its effectiveness is demonstrated by simulations in the presence of parameter uncertainties and noises and by comparison studies with the non-adaptive G-MPSP. 相似文献
97.
Matteo Rubagotti Marco Carminati Giampiero Clemente Riccardo Grassetti Antonella Ferrara 《Asian journal of control》2012,14(5):1159-1170
In this paper, an accurate model of an airbrake electro‐hydraulic smart actuator is obtained by physical considerations, and then different control strategies (variable‐gain proportional control, PT1 control with switching integrator, and second order sub‐optimal sliding mode control) are proposed and analyzed. This application is innovative in the avionic field, and is one of the first attempts to realize a fly‐by‐wire system for airbrakes, oriented to its immediate employment and installation on current aircraft. The project was carried on with the participation of the Italian Ministry of Defense, and was commissioned to MAG, a leading provider of integrated systems and aviation services for aerospace. Copyright © 2011 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society 相似文献
98.
An overview of the environmental,economic, and material developments of the solar and wind sources coupled with the energy storage systems 下载免费PDF全文
There is a constant growth in energy consumption and consequently energy generation around the world. During the recent decades, renewable energy sources took heed of scientists and policy makers as a remedy for substituting traditional sources. Wind and photovoltaic (PV) are the least reliable sources because of their dependence on wind speed and irradiance and therefore their intermittent nature. Energy storage systems are usually coupled with these sources to increase the reliability of the hybrid system. Environmental effects are one of the biggest concerns associated with the renewable energy sources. This study summarizes the last and most important environmental and economic analysis of a grid‐connected hybrid network consisting of wind turbine, PV panels, and energy storage systems. Focusing on environmental aspects, this paper reviews land efficiency, shaded analysis of wind turbines and PV panels, greenhouse gas emission, wastes of wind turbine and PV panels' components, fossil fuel consumption, wildlife, sensitive ecosystems, health benefits, and so on. A cost analysis of the energy generated by a hybrid system has been discussed. Furthermore, this study reviews the latest technologies for materials that have been used for solar PV manufacturing. This paper can help to make a right decision considering all aspects of installing a hybrid system. Copyright © 2017 John Wiley & Sons, Ltd. 相似文献
99.
《Expert systems with applications》2014,41(15):6688-6700
This paper presents a control system, based on artificial intelligence technologies, that implements multiple intelligences. This system aims to support and improve automatic telecontrol of solar power plants, by either automatically triggering actuators or dynamically giving recommendations to human operators. For this purpose, the development of a MultiAgent System is combined with a variety of inference systems, such as Expert Systems, Neural Networks, and Bayesian Networks. This diversity of intelligent technologies is shown to result in an efficient way to mimic the reasoning process in human operators. 相似文献
100.