全文获取类型
收费全文 | 3996篇 |
免费 | 828篇 |
国内免费 | 678篇 |
专业分类
电工技术 | 1427篇 |
综合类 | 440篇 |
化学工业 | 105篇 |
金属工艺 | 91篇 |
机械仪表 | 346篇 |
建筑科学 | 192篇 |
矿业工程 | 135篇 |
能源动力 | 135篇 |
轻工业 | 28篇 |
水利工程 | 145篇 |
石油天然气 | 59篇 |
武器工业 | 145篇 |
无线电 | 379篇 |
一般工业技术 | 163篇 |
冶金工业 | 112篇 |
原子能技术 | 28篇 |
自动化技术 | 1572篇 |
出版年
2024年 | 64篇 |
2023年 | 150篇 |
2022年 | 210篇 |
2021年 | 236篇 |
2020年 | 269篇 |
2019年 | 234篇 |
2018年 | 234篇 |
2017年 | 289篇 |
2016年 | 274篇 |
2015年 | 235篇 |
2014年 | 306篇 |
2013年 | 284篇 |
2012年 | 306篇 |
2011年 | 323篇 |
2010年 | 225篇 |
2009年 | 242篇 |
2008年 | 198篇 |
2007年 | 245篇 |
2006年 | 204篇 |
2005年 | 140篇 |
2004年 | 149篇 |
2003年 | 111篇 |
2002年 | 100篇 |
2001年 | 95篇 |
2000年 | 74篇 |
1999年 | 47篇 |
1998年 | 33篇 |
1997年 | 42篇 |
1996年 | 41篇 |
1995年 | 29篇 |
1994年 | 22篇 |
1993年 | 16篇 |
1992年 | 12篇 |
1991年 | 13篇 |
1990年 | 8篇 |
1989年 | 11篇 |
1988年 | 6篇 |
1987年 | 4篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1979年 | 2篇 |
1966年 | 2篇 |
1965年 | 1篇 |
1964年 | 2篇 |
1963年 | 1篇 |
1962年 | 1篇 |
1960年 | 1篇 |
1959年 | 1篇 |
1958年 | 1篇 |
1954年 | 1篇 |
排序方式: 共有5502条查询结果,搜索用时 15 毫秒
1.
2.
线性时变系统的区间稳定性与鲁棒稳定性 总被引:7,自引:0,他引:7
本文应用向量比较定理研究线性时变系统的区间稳定性和具非线性时变摄动的线性时变系统的鲁棒稳定性,所得的新结果包含文献的一些主要结果作为特例,本文的研究方法说明向量比较方法是分析区间稳定性和鲁棒稳定性的一种自然而有力的工具。 相似文献
3.
Taijiro Nonaka Rodney J. Clifton Taichiro Okazaki 《International Journal of Impact Engineering》1996,18(7-8):889-898
An analysis is presented of longitudinal waves in a thin elastic column. Velocity is specified at one end, and the boundary condition at the other end is expressed in terms of a range of effective impedances of an attached structure. Propagation, reflection and interference of the waves are followed by the method of characteristics. Integration of differential equations along characteristics yields the wave-induced stress, which is then applied to problems of earthquake excitation. Numerical examples are given for recorded updown ground motion of the Kobe Earthquake. 相似文献
4.
对投电容器扰动识别和定位的方法进行了改进。针对其他此类方法的不足,比如在电压幅值低时投电容器扰动的识别、定位“可信度不高”等,文中通过提取小波变换的特定层的系数,对需要识别的电容器扰动的分解信号相对增强,而其他扰动的分解信号相对减弱,然后再提取熵特征值,结果表明它可以作为识别低电压时投电容器扰动的依据。在对电容器扰动进行定位时,参考了功率和能量定位法,并对其进行了改进。仿真分析证明,在电压幅值较低时,可以准确和可靠地对电容器扰动进行识别和定位。 相似文献
5.
Katsuhiko Fuwa Tatsuo Narikiyo Yasuyuki Funahashi 《Electrical Engineering in Japan》2002,138(4):50-60
A well‐known control system which can reduce the adverse effects of disturbances is a disturbance observer. However, in many cases of mechanical systems, system disturbances which do not satisfy the matching condition may be imposed. Therefore, it may be difficult to reduce the adverse effects of the disturbances by the traditional disturbance observer. In this paper, a method of control system synthesis for disturbance rejection using a dual observer is proposed. This method is based on the zeroing induced by the disturbance localization problem. This problem may be solved by dividing the state space into observable subspace and unobservable subspace. As compared with an H∞ controller based on perfect observation, the usefulness of the proposed control system for disturbance rejection is demonstrated by numerical simulations for a two‐mass spring system. © 2002 Scripta Technica, Electr Eng Jpn, 138(4): 50–60, 2002; DOI 10.1002/eej.1138 相似文献
6.
External magnetic disturbance influences the quality of the image obtained with a magnetic resonance imaging (MRI) system because it causes magnetic resonance frequency drift. When a superconducting magnet in persistent current mode operation is exposed to external magnetic disturbance coil current varies to keep linkage flux constant. Conventional analysis is usually formulated with constant current and does not provide correct evaluation of drift of magnetic field in the magnet. This paper proposes a method of numerical analysis of magnetic field considering conservation of linkage flux in a superconducting magnet under a persistent current mode operation. This method is applied to evaluate drift of the magnetic field in a superconducting magnet for magnetic resonance imaging due to external magnetic disturbance. Analysis results show good agreement with the experimental results. 相似文献
7.
D. Bergmann U. KaiserS. Wagner 《Journal of Wind Engineering & Industrial Aerodynamics》2003,91(4):543-550
The determination of dynamic wind loads on buildings, i.e. pressure and deflection, has gained increasing interest (European Prestandard ENV 1991-2-4, Eurocode 1: basis of design and actions on structures—Part 2-4: actions on structures—wind actions, European Committe for Standardization, Brussels, 1995; DIN 1055 Teil 4 Lastannahmen für Bauten, Verkehrslasten, Windlasten bei nicht schwingungsanfälligen Bauwerken, 1991; N. Hölscher, M. Hortmanns, J. Sahlem, Praxisnahe Erfassung von Windwirkung an Industrie- und Hochbauten, Windwirkung im Bauwesen, Braunschweig, 7, Dreiländertagung D-A-CH 2001, Windtechnologische Gesselschaft, 2001 [1], [2] and [3]). Therefore, the spectral distributions of velocity and pressure fluctuations in wind tunnels are an important quality aspect. While velocity fluctuations can be manipulated by the obstacles used to create the turbulence, pressure fluctuations are influenced by acoustic noise as well. Especially, the first eigenfrequency of the longitudinal mode of the wind tunnel tends to disturb the pressure spectrum.In this paper, a solution for the reduction of low-frequency acoustic pressure fluctuation is presented and its application in the atmospheric boundary layer wind tunnel at the IAG is shown. 相似文献
8.
Positioning control systems for robot arms are presented within a general framework in view of unification and classification. Treating coupling torques from other links as an external disturbance reduces the design of the control system to that of SISO servomechanisms driving each of the robot axes individually. A short survey of many control strategies proposed in the literature presents them as different methods aiming at attenuation of this disturbance. The use of disturbance observers is shown to provide a nice and simple way for that purpose. This could be applied to the improvement of actual industrial robots at the cost of slight software modifications. 相似文献
9.
Xi‐Sheng Zhan Zhi‐Hong Guan Rui‐Quan Liao Fu‐Shun Yuan 《Asian journal of control》2012,14(6):1608-1616
The analysis method of optimal tracking performance is proposed for multiple‐input multiple‐output (MIMO) linear time‐invariant (LTI) systems under disturbance rejection. An H2 criterion of the error signal between the output of the plant and the reference signal is used as a measure for the tracking performance. Spectral factorization is applied to obtain the optimal solution of the system tracking error. The explicit expressions are derived for this minimal tracking error with respect to random reference signals under disturbance rejection. It is shown that the nonminimum phase zeros, the zero direction, the unstable poles, the pole direction of a given plant, statistical characteristics of the reference input signal, and disturbance signal have a negative effect on a feedback system's ability to reduce the system error with disturbance rejection. The results show that the optimal tracking performance will further be damaged because of disturbance rejection. Some typical examples are given to illustrate the theoretical results. 相似文献
10.