全文获取类型
收费全文 | 11526篇 |
免费 | 1541篇 |
国内免费 | 1282篇 |
专业分类
电工技术 | 1104篇 |
技术理论 | 1篇 |
综合类 | 1572篇 |
化学工业 | 323篇 |
金属工艺 | 125篇 |
机械仪表 | 494篇 |
建筑科学 | 363篇 |
矿业工程 | 176篇 |
能源动力 | 279篇 |
轻工业 | 161篇 |
水利工程 | 67篇 |
石油天然气 | 154篇 |
武器工业 | 302篇 |
无线电 | 3339篇 |
一般工业技术 | 849篇 |
冶金工业 | 251篇 |
原子能技术 | 92篇 |
自动化技术 | 4697篇 |
出版年
2024年 | 53篇 |
2023年 | 148篇 |
2022年 | 247篇 |
2021年 | 266篇 |
2020年 | 398篇 |
2019年 | 348篇 |
2018年 | 346篇 |
2017年 | 462篇 |
2016年 | 490篇 |
2015年 | 519篇 |
2014年 | 771篇 |
2013年 | 908篇 |
2012年 | 882篇 |
2011年 | 980篇 |
2010年 | 779篇 |
2009年 | 831篇 |
2008年 | 784篇 |
2007年 | 860篇 |
2006年 | 758篇 |
2005年 | 647篇 |
2004年 | 514篇 |
2003年 | 442篇 |
2002年 | 330篇 |
2001年 | 339篇 |
2000年 | 278篇 |
1999年 | 189篇 |
1998年 | 175篇 |
1997年 | 147篇 |
1996年 | 110篇 |
1995年 | 81篇 |
1994年 | 60篇 |
1993年 | 46篇 |
1992年 | 40篇 |
1991年 | 26篇 |
1990年 | 20篇 |
1989年 | 25篇 |
1988年 | 7篇 |
1987年 | 6篇 |
1986年 | 3篇 |
1985年 | 12篇 |
1984年 | 6篇 |
1983年 | 6篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1976年 | 1篇 |
1964年 | 2篇 |
1962年 | 1篇 |
1961年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
提出一个新的线性时滞系统稳定的充分必要条件,与以前的结论不同的是,我们的结论的表达形式更容易数值计算。开发相应的二种收敛算法,解决系统时滞独立稳定判断和时滞相关稳定的时滞界估计。本文给出范数有界不确定性时,系统稳定的充分条件。文末给出的数值实例证明本文结果降低计算复杂度,改进了时滞估计保守性。 相似文献
63.
本文针对精馏塔不稳定时滞过程,提出一种基于设定值加权的分数阶PIλDμ控制器设计方法.首先采用比例环节构成内环反馈镇定不稳定时滞过程,然后基于等效的过程模型,依据设定值加权方法设计分数阶PIλDμ控制器,并进行了控制器参数整定.仿真结果表明:分数阶PIλDμ控制器可以使精馏塔不稳定时滞过程系统获得良好的动态响应特性,干扰抑制特性以及克服系统参数变化的鲁棒性. 相似文献
64.
Two general integral inequalities and their applications to stability analysis for systems with time‐varying delay 下载免费PDF全文
Integral inequalities have been widely used in stability analysis for systems with time‐varying delay because they directly produce bounds for integral terms with respect to quadratic functions. This paper presents two general integral inequalities from which almost all of the existing integral inequalities can be obtained, such as Jensen inequality, the Wirtinger‐based inequality, the Bessel–Legendre inequality, the Wirtinger‐based double integral inequality, and the auxiliary function‐based integral inequalities. Based on orthogonal polynomials defined in different inner spaces, various concrete single/multiple integral inequalities are obtained. They can produce more accurate bounds with more orthogonal polynomials considered. To show the effectiveness of the new inequalities, their applications to stability analysis for systems with time‐varying delay are demonstrated with two numerical examples. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
65.
Pseudo‐predictor feedback control of discrete‐time linear systems with a single input delay 下载免费PDF全文
This paper studies the problems of stabilization of discrete‐time linear systems with a single input delay. By developing the methodology of pseudo‐predictor feedback, which uses the (artificial) closed‐loop system dynamics to predict the future state, memoryless state feedback control laws are constructed to solve the problem. Necessary and sufficient conditions are obtained to guarantee the stability of the closed‐loop system in terms of the stability of a class‐difference equations. It is also shown that the proposed controller achieves semi‐global stabilization of the system if its actuator is subject to either magnitude saturation or energy constraints under the condition that the open‐loop system is only polynomially unstable. Numerical examples have been worked out to illustrate the effectiveness of the proposed approaches. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
66.
Robust Adaptive Neural Control for a Class of Time‐Varying Delay Systems with Backlash‐like Hysteresis Input 下载免费PDF全文
Xiuyu Zhang Zhi Li Chun‐Yi Su Xinkai Chen Jianguo Wang Linlin Xia 《Asian journal of control》2016,18(3):1087-1101
This paper proposes a robust adaptive dynamic surface control (DSC) scheme for a class of time‐varying delay systems with backlash‐like hysteresis input. The main features of the proposed DSC method are that 1) by using a transformation function, the prescribed transient performance of the tracking error can be guaranteed; 2) by estimating the norm of the unknown weighted vector of the neural network, the computational burden can be greatly reduced; 3) by using the DSC method, the explosion of complexity problem is eliminated. It is proved that the proposed scheme guarantees all the closed‐loop signals being uniformly ultimately bounded. The simulation results show the validity of the proposed control scheme. 相似文献
67.
This paper is concerned with the analysis of the mean square exponential stability and the almost sure exponential stability of linear stochastic neutral delay systems. A general stability result on the mean square and almost sure exponential stability of such systems is established. Based on this stability result, the delay partitioning technique is adopted to obtain a delay‐dependent stability condition in terms of linear matrix inequalities (LMIs). In obtaining these LMIs, some basic rules of the Ito calculus are also utilized to introduce slack matrices so as to further reduce conservatism. Some numerical examples borrowed from the literature are used to show that, as the number of the partitioning intervals increases, the allowable delay determined by the proposed LMI condition approaches hmax, the maximal allowable delay for the stability of the considered system, indicating the effectiveness of the proposed stability analysis. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
68.
Sufficient conditions for stability and stabilization of networked control systems with uncertainties and nonlinearities 下载免费PDF全文
In this paper, we consider the problem of robust stability and stabilization for networked control systems (NCS) with uncertain/nonlinear dynamics AUTHOR: Please check that authors and their affiliations are correct. in which the network‐induced delays are time‐varying and bounded. Based on some recent achievements, a relatively simple Lyapunov–Krasovskii functional is proposed to derive sufficient conditions both for analysis and synthesis of NCS in the form of LMIs depending on the delay bounds. The effectiveness of the proposed method is illustrated by several benchmark examples available in the literature. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
69.
The problem of the stability of a linear system with an interval time‐varying delay is investigated. A new Lyapunov–Krasovskii functional that fully uses information about the lower bound of the time‐varying delay is constructed to derive new stability criteria. It is proved that the proposed Lyapunov–Krasovskii functional can lead to less conservative results than some existing ones. Based on the proposed Lyapunov–Krasovskii functional, two stability conditions are developed using two different methods to estimate Lyapunov–Krasovskii functional's derivative. Two numerical examples are given to illustrate that the two stability conditions are complementary and yield a larger maximum upper bound of the time‐varying delay than some existing results. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
70.
Amar Si Ammour Said Djennoune Woihida Aggoune Maamar Bettayeb 《Asian journal of control》2015,17(5):1946-1954
This paper describes a variable structure control for fractional‐order systems with delay in both the input and state variables. The proposed method includes a fractional‐order state predictor to eliminate the input delay. The resulting state‐delay system is controlled through a sliding mode approach where the controller uses a sliding surface defined by fractional order integral. Then, the proposed control law ensures that the state trajectories reach the sliding surface in finite time. Based on recent results of Lyapunov stability theory for fractional‐order systems, the stability of the closed loop is studied. Finally, an illustrative example is given to show the interest of the proposed approach. 相似文献