全文获取类型
收费全文 | 9192篇 |
免费 | 1305篇 |
国内免费 | 1136篇 |
专业分类
电工技术 | 978篇 |
综合类 | 1247篇 |
化学工业 | 233篇 |
金属工艺 | 59篇 |
机械仪表 | 409篇 |
建筑科学 | 162篇 |
矿业工程 | 132篇 |
能源动力 | 228篇 |
轻工业 | 92篇 |
水利工程 | 47篇 |
石油天然气 | 91篇 |
武器工业 | 250篇 |
无线电 | 2413篇 |
一般工业技术 | 742篇 |
冶金工业 | 209篇 |
原子能技术 | 65篇 |
自动化技术 | 4276篇 |
出版年
2024年 | 45篇 |
2023年 | 135篇 |
2022年 | 216篇 |
2021年 | 217篇 |
2020年 | 331篇 |
2019年 | 310篇 |
2018年 | 313篇 |
2017年 | 382篇 |
2016年 | 433篇 |
2015年 | 439篇 |
2014年 | 653篇 |
2013年 | 756篇 |
2012年 | 713篇 |
2011年 | 780篇 |
2010年 | 622篇 |
2009年 | 680篇 |
2008年 | 654篇 |
2007年 | 655篇 |
2006年 | 593篇 |
2005年 | 511篇 |
2004年 | 405篇 |
2003年 | 317篇 |
2002年 | 253篇 |
2001年 | 267篇 |
2000年 | 206篇 |
1999年 | 150篇 |
1998年 | 139篇 |
1997年 | 115篇 |
1996年 | 84篇 |
1995年 | 60篇 |
1994年 | 42篇 |
1993年 | 39篇 |
1992年 | 35篇 |
1991年 | 20篇 |
1990年 | 13篇 |
1989年 | 18篇 |
1988年 | 4篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 6篇 |
1984年 | 5篇 |
1983年 | 3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 |
1958年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
Lirong Huang 《Asian journal of control》2012,14(6):1496-1504
Recently, the sliding mode control (SMC) method has been extended to accommodate stochastic systems. Particularly, restrictive assumption on the structure of the control systems have been removed and a practical SMC design method for stochastic systems has been presented. This paper continues this line of research and studies the SMC methods for stochastic systems with state delay in diffusion. Both delay‐independent and delay‐dependent approaches are investigated. Essentially, this paper studies SMC design methods with memoryless controllers for time delay systems, which has been a problem in the past decades. 相似文献
62.
In this paper, we study the existence and asymptotic stability in the pth moment of the mild solutions to impulsive stochastic neutral partial differential equations with infinite delays. Sufficient conditions ensuring the stability of the impulsive stochastic system are established. The results are obtained via the Banach fixed point theorem. 相似文献
63.
64.
This paper studies the robustness problem of the min–max model predictive control (MPC) scheme for constrained nonlinear time‐varying delay systems subject to bounded disturbances. The notion of the input‐to‐state stability (ISS) of nonlinear time‐delay systems is introduced. Then by using the Lyapunov–Krasovskii method, a delay‐dependent sufficient condition is derived to guarantee input‐to‐state practical stability (ISpS) of the closed‐loop system by way of nonlinear matrix inequalities (NLMI). In order to lessen the online computational demand, the non‐convex min‐max optimization problem is then converted to a minimization problem with linear matrix inequality (LMI) constraints and a suboptimal MPC algorithm is provided. Finally, an example of a truck‐trailer is used to illustrate the effectiveness of the proposed results. Copyright © 2010 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society 相似文献
65.
This paper studies the exponential stabilization problem of uncertain time‐delay linear systems with Markovian jumping parameters. A novel delay decomposition approach is developed to derive delay‐dependent conditions under which the closed‐loop control system is mean square exponentially stable for all admissible uncertainties. It is shown that the feedback gain matrices and the decay rate can be obtained by solving coupled linear matrix inequalities. Moreover, the difficulties arising from searching for tuning parameters in the existing methods are overcome. Copyright © 2010 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society 相似文献
66.
This paper investigates the delay‐dependent adaptive synchronization problem of the master and slave structure of linear systems with both constant neutral and time‐varying discrete time‐delays and nonlinear perturbations based on the Barbalat lemma and matching conditions. An adaption law which includes the master‐slave parameters is obtained by using the Lyapunov functional method and inequality techniques to synchronize the master‐slave systems without the knowledge of upper bounds of perturbation terms. Particularly, it is shown that the synchronization speed can be controlled by adjusting the update gain of the synchronization signal. A numerical example has been given to show the effectiveness of the method. Copyright © 2011 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society 相似文献
67.
This paper gives a novel delay-dependent admissibility condition of discrete-time singular systems with time-varying delays. For convenience, the time-varying delay is assumed to be the sum of delay lower bound and the integral multiples of a constant delay. Specially, if the constant delay is of unit length, the delay is an interval-like time-varying delay. The proposed admissibility condition is presented and expressed in terms of linear matrix inequality (LMI) by Lyapunov approach. Generally, the uncertainty of time-varying delay would lead to conservatism. In this paper, this critical issue is tackled by accurately estimating the time-varying delay. Consequently, the proposed admissibility condition is less conservative than the existing results, which is demonstrated by a numerical example. 相似文献
68.
This paper investigates a stochastic optimal control problem with delay and of mean-field type, where the controlled state process is governed by a mean-field jump–diffusion stochastic delay differential equation. Two sufficient maximum principles and one necessary maximum principle are established for the underlying system. As an application, a bicriteria mean–variance portfolio selection problem with delay is studied to demonstrate the effectiveness and potential of the proposed techniques. Under certain conditions, explicit expressions are provided for the efficient portfolio and the efficient frontier, which are as elegant as those in the classical mean–variance problem without delays. 相似文献
69.
70.
Satoko Abiko Yoshikazu Satake Xin Jiang Teppei Tsujita Masaru Uchiyama 《Advanced Robotics》2014,28(17):1177-1188
A hybrid motion simulator embeds a hardware experiment in a numerical simulation loop. However, it is often subjected to the inherent problem of an energy increase in the collision of two pieces of hardware in a loop because of the delay time. This paper proposes a delay time compensation method based on contact dynamics model for a collision hybrid motion simulator under delay time and establishes a compensation method for coupled translational and rotational motion. The model developed in this paper describes linear uniform motion of a floating object during the period of the delay time until the force and torque are observed and non-linear motion according to environmental stiffness after the initial delay time period in contact. By using the above model, compensation parameters are designed based on desired coefficient of restitution with iterative calculation. The proposed method achieves accurate delay time compensation and simultaneously realizes a variable desired coefficient of restitution over a wide range of frequencies. Furthermore, the compensation method for multi-dimensional motion is established under the assumption that the friction effect is very small. The efficiency of the proposed method is verified through collision experiments for the coupled motion in two dimensions. 相似文献