全文获取类型
收费全文 | 3178篇 |
免费 | 632篇 |
国内免费 | 603篇 |
专业分类
电工技术 | 1039篇 |
综合类 | 363篇 |
化学工业 | 82篇 |
金属工艺 | 59篇 |
机械仪表 | 342篇 |
建筑科学 | 5篇 |
矿业工程 | 17篇 |
能源动力 | 52篇 |
轻工业 | 4篇 |
水利工程 | 3篇 |
石油天然气 | 6篇 |
武器工业 | 79篇 |
无线电 | 187篇 |
一般工业技术 | 77篇 |
冶金工业 | 40篇 |
原子能技术 | 4篇 |
自动化技术 | 2054篇 |
出版年
2024年 | 50篇 |
2023年 | 151篇 |
2022年 | 131篇 |
2021年 | 191篇 |
2020年 | 251篇 |
2019年 | 294篇 |
2018年 | 174篇 |
2017年 | 223篇 |
2016年 | 239篇 |
2015年 | 219篇 |
2014年 | 238篇 |
2013年 | 305篇 |
2012年 | 196篇 |
2011年 | 221篇 |
2010年 | 157篇 |
2009年 | 185篇 |
2008年 | 153篇 |
2007年 | 178篇 |
2006年 | 151篇 |
2005年 | 119篇 |
2004年 | 111篇 |
2003年 | 82篇 |
2002年 | 64篇 |
2001年 | 58篇 |
2000年 | 43篇 |
1999年 | 33篇 |
1998年 | 30篇 |
1997年 | 32篇 |
1996年 | 29篇 |
1995年 | 22篇 |
1994年 | 10篇 |
1993年 | 16篇 |
1992年 | 17篇 |
1991年 | 9篇 |
1990年 | 12篇 |
1989年 | 2篇 |
1988年 | 4篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1964年 | 1篇 |
1962年 | 1篇 |
1954年 | 1篇 |
1951年 | 2篇 |
排序方式: 共有4413条查询结果,搜索用时 31 毫秒
911.
为实现不同种混沌系统之间的同步问题,提出一种基于高增益观测器的滑模控制混沌同步方法.该方法以混沌同步误差系统的标准型为模型,将两个混沌系统之间的结构差异扩张成系统的状态,尽可能少地利用可测的系统信息来构造高增益观测器估计系统的所有状态,设计出物理上可实现的滑模控制策略,有效地解决了不同种系统之间的混沌同步问题.理论分析和仿真结果都验证了该方法的可行性和有效性.该方法在基于混沌同步的保密通信中有很好的应用前景. 相似文献
912.
913.
914.
本文以一类卷绕系统的收卷过程为研究对象,建立了其动态数学模型,提出了一种基于张力观测器的新型控制方案。笔者根据辊的动态转矩平衡方程式,利用系统原有的电机控制和速度检测信号,将观测的张力值作为反馈,构成张力闲环,从而实现无传感器反馈控制。最后,对这种方案进行了仿真。结果表明,本文提出的方案完全可以达到常规规方案的动态性能,具有较高的稳态精度。这充分说明了该算法是可行的。 相似文献
915.
This paper addresses the problem of executing multiple prioritized tasks for robot manipulators with compliant behavior in the remaining null space. A novel controller–observer is proposed to ensure accurate accomplishment of various tasks based on a predefined hierarchy using a new priority assignment approach. Force control, position control and orientation control are considered. Moreover, a compliant behavior is imposed in the null space to handle physical interaction without using joint torque measurements. Asymptotic stability of the task space error and external torque estimation error during executing multiple tasks are shown. The performance of the proposed approach is evaluated on a 7R light weight robot arm by several case studies. 相似文献
916.
Global Practical Mittag Leffler Stabilization by Output Feedback for a Class Of Nonlinear Fractional‐Order Systems
下载免费PDF全文
![点击此处可从《Asian journal of control》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Omar Naifar Abdellatif Ben Makhlouf Mohamed Ali Hammami Liping Chen 《Asian journal of control》2018,20(1):599-607
In this paper, the problem of a global practical Mittag Leffler feedback stabilization for a class of nonlinear fractional order systems by means of observer is described. The linear matrix inequality approach is used to guarantee the practical stability of the proposed feedback fractional order system. An illustrative example is given to show the applicability of the results. 相似文献
917.
918.
Longsheng Chen Hui Yang 《International Journal of Adaptive Control and Signal Processing》2020,34(4):520-542
In this study, an adaptive output feedback control with prescribed performance is proposed for unknown pure feedback nonlinear systems with external disturbances and unmeasured states. A novel prescribed performance function is developed and incorporated into an output error transformation to achieve tracking control with prescribed performance. To handle the unknown non-affine nonlinearities and avoid the algebraic loop problem, the radial basis function neural network (RBFNN) is adopted to approximate the unknown non-affine nonlinearities with the help of Butterworth low-pass filter. Based on the output of the RBFNN, the coupled design between sate observer and disturbance observer is presented to estimate the unmeasured states and compounded disturbances. Then, the adaptive output feedback control scheme is proposed for unknown pure feedback nonlinear systems, where a first-order filter is introduced to tackle with the issue of “explosion of complexity” in the traditional back-stepping approach. The boundedness and convergence of the closed-loop system are proved rigorously by utilizing the Lyapunov stability theorem. Finally, simulation studies are worked out to demonstrate the effectiveness of the proposed scheme. 相似文献
919.
Fuqiang You Shiya Cheng Kuo Tian Xinyan Zhang 《International Journal of Adaptive Control and Signal Processing》2020,34(1):92-109
This paper studies the problem of robust fault estimation for a class of Takagi-Sugeno(T-S) fuzzy systems which subject to interval time-varying delay, external disturbance, and actuator fault. The designed learning observer can achieve simultaneous estimation of system state and time-varying or constant actuator fault. Then, we construct a new Lyapunov-Krasovskii functional including the information of the lower and upper delay bounds; compared with the time-varying delay, the interval time-varying delay is the less conservative form. Furthermore, one less conservative delay-dependent condition for the existence of learning observer is given in terms of linear matrix inequalities. In addition, the results for the systems with interval time-varying delay are simplified when the delay is not concluded. Finally, simulation results of two examples are presented to show the effectiveness of the proposed method. 相似文献
920.
A two-time-scale system involves both fast and slow dynamics. This article studies observer design for general nonlinear two-time-scale systems and presents two alternative nonlinear observer design approaches, one full-order and one reduced-order. The full-order observer is designed by following a scheme to systematically select design parameters, so that the fast and slow observer dynamics are assigned to estimate the corresponding system modes. The reduced-order observer is derived based on a lower dimensional model to reconstruct the slow states, along with the algebraic slow-motion invariant manifold function to reconstruct the fast states. Through an error analysis, it is shown that the reduced-order observer is capable of providing accurate estimation of the states for the detailed system with an exponentially decaying estimation error. In the last part of the article, the two proposed observers are designed for an anaerobic digestion process, as an illustrative example to evaluate their performance and convergence properties. 相似文献