全文获取类型
收费全文 | 10523篇 |
免费 | 1061篇 |
国内免费 | 371篇 |
专业分类
电工技术 | 460篇 |
综合类 | 452篇 |
化学工业 | 833篇 |
金属工艺 | 277篇 |
机械仪表 | 894篇 |
建筑科学 | 790篇 |
矿业工程 | 81篇 |
能源动力 | 183篇 |
轻工业 | 170篇 |
水利工程 | 117篇 |
石油天然气 | 71篇 |
武器工业 | 53篇 |
无线电 | 1839篇 |
一般工业技术 | 443篇 |
冶金工业 | 127篇 |
原子能技术 | 57篇 |
自动化技术 | 5108篇 |
出版年
2025年 | 8篇 |
2024年 | 108篇 |
2023年 | 139篇 |
2022年 | 217篇 |
2021年 | 249篇 |
2020年 | 224篇 |
2019年 | 278篇 |
2018年 | 203篇 |
2017年 | 342篇 |
2016年 | 379篇 |
2015年 | 353篇 |
2014年 | 558篇 |
2013年 | 569篇 |
2012年 | 590篇 |
2011年 | 694篇 |
2010年 | 589篇 |
2009年 | 677篇 |
2008年 | 695篇 |
2007年 | 751篇 |
2006年 | 671篇 |
2005年 | 568篇 |
2004年 | 494篇 |
2003年 | 454篇 |
2002年 | 353篇 |
2001年 | 253篇 |
2000年 | 251篇 |
1999年 | 174篇 |
1998年 | 183篇 |
1997年 | 116篇 |
1996年 | 119篇 |
1995年 | 91篇 |
1994年 | 94篇 |
1993年 | 105篇 |
1992年 | 72篇 |
1991年 | 36篇 |
1990年 | 35篇 |
1989年 | 39篇 |
1988年 | 43篇 |
1987年 | 26篇 |
1986年 | 27篇 |
1985年 | 18篇 |
1984年 | 31篇 |
1983年 | 13篇 |
1982年 | 17篇 |
1981年 | 13篇 |
1980年 | 13篇 |
1979年 | 11篇 |
1978年 | 3篇 |
1977年 | 4篇 |
1975年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Bernard Brogliato Rogelio Lozano 《International Journal of Adaptive Control and Signal Processing》1992,6(1):35-44
The standard least squares (LS) estimation algorithm is modified in such a way that it becomes passive. Therefore the scope of application of the LS algorithm is extended to those adaptive schemes whose convergence proof is based on passivity. The passive version of LS is presented in both continuous and discrete time. 相似文献
2.
Ramon R. Costa Liu Hsu 《International Journal of Adaptive Control and Signal Processing》1992,6(1):19-33
A variable structure model reference adaptive controller (VS-MRAC) using only input and output measurements was recently proposed and shown to be globally asymptotically stable with superior transient behaviour and disturbance rejection properties. In this paper a singular perturbation approach is used in order to establish the robustness of the controller in the presence of unmodelled dynamics (parasitics) and disturbances. We develop a new Lyapunov-based technique to analyse the overall system and show that for sufficiently small parasitics the system remains stable and the output error is small in some sense. 相似文献
3.
直接斜率波前复原算法的控制效果分析 总被引:7,自引:0,他引:7
建立自适应光学系统功率谱抑制函数的概念,分析了采用直接斜率波前复原算法的自适应当光学系统的控制效果,理论分析与61单元自适应光学系统上的实验结果表明,直接斜率波前复原算法将导致控制效果下降。 相似文献
4.
Jing Yuan Yury Stepanenko 《International Journal of Adaptive Control and Signal Processing》1992,6(2):111-126
A new adaptive controller is presented here for rigid-body robotic manipulators. It is stable and robust with respect to a class of external disturbances. The robustness of the adaptive controller is established without the ‘slow-varying’ assumption and the computationally demanding regressor matrix. The control law consists of a non-adaptive PD control part and an adaptive control part. It uses two adaptive matrices to compensate two uniformly bounded coefficient matrices derived from the original dynamics. A α σ|q?|-modified adaptive law is designed to adjust the adaptive matrices. A Lyapunov-type stability analysis indicates that the closed-loop system is uniformly ultimately bounded. The tracking error and compensation error will eventually converge into a closed region, which can be made arbitrarily small by adjusting the controller parameters. Simulation results are included to demonstrate the performance of the proposed controller. 相似文献
5.
6.
《Journal of Systems Architecture》2014,60(10):783-795
Complex systems on chip containing dozens of processing resources with critical communication requirements usually rely on the use of networks on chip (NoCs) as communication infrastructure. NoCs provide significant advantages over simpler infrastructures such as shared busses or point to point communication, including higher scalability, more efficient energy management, higher bandwidth and lower average latency. Applications running on NoCs with more than 10% of bandwidth usage attest that the most significant portion of message latencies refers to buffered packets waiting to enter the NoC, whereas the latency portion that depends on the packet traversing the NoC is sometimes negligible. This work presents an adaptive routing architecture, named Monitored NoC (MoNoC), which is based on a traffic monitoring mechanism and the exchange of high priority control packets. This method enables to adapt paths by choosing less congested routes. Practical experiments show that the proposed path adaptation is a fast process, enabling to transmit packets with smaller latencies, up to 9 times smaller, by using non-congested NoC regions. 相似文献
7.
8.
系统地比较和分析了OFDM传输系统里高功率放大器(HPA)预失真方法的优缺点,提出一种基于模块化模型的有记忆高功率放大器自适应数字预失真方法,该方法分别基于Wiener、Hammerstein和Wiener-Hammerstein模型各自构成一个有记忆HPA的自适应预失真器。从而避免了因分别估计Wiener-Hammerstein模型各个环节特性参数所带来的复杂性。使得有记忆高功率放大器的预失真设计变得简单了。 相似文献
9.
Recent researches have demonstrated the importance of concept map and its versatile applications especially in e-Learning. For example, while designing adaptive learning materials, designers need to refer to the concept map of a subject domain. Moreover, concept maps can show the whole picture and core knowledge about a subject domain. Research from literature also suggests that graphical representation of domain knowledge can reduce the problems of information overload and learning disorientation for learners. However, construction of concept maps typically relied upon domain experts in the past; it is a time consuming and high cost task. Concept maps creation for emerging new domains such as e-Learning is even more challenging due to its ongoing development nature. The aim of this paper is to construct e-Learning domain concept maps from academic articles. We adopt some relevant journal articles and conference papers in e-Learning domain as data sources, and apply text-mining techniques to automatically construct concept maps for e-Learning domain. The constructed concept maps can provide a useful reference for researchers, who are new to the e-Leaning field, to study related issues, for teachers to design adaptive learning materials, and for learners to understand the whole picture of e-Learning domain knowledge. 相似文献
10.
Jen‐te Yu 《Asian journal of control》2009,11(1):1-10
A new Coulomb friction compensator is proposed for servo control systems in this paper. The novelty of the new approach lies in its capability of assigning the eigenvalues of the resulting closed loop system while attacking the problem. First, based on the standard backstepping methodology, an implicit Lyapunov function, with part of the components being only symbolically constructed at the very beginning, is utilized. To increase the robustness of the system against disturbance and model inaccuracy, an integral term is employed in the design. Using part of the variable gradient method, we are able to turn the implicit Lyapunov function into an explicit one, which is positive definite, and whose time‐derivative is negative definite. Second, it will be shown that the resulting closed loop error system is a switched linear system with two possible active modes that share the same set of eigenvalues, which is at our disposal. Unlike the common adaptive control design methods, such as the Control Lyapunov Function approach, in which the gains are typically positive but otherwise arbitrary, and are hence difficult to choose and have a lack of connection with the system's performance, our new scheme imposes two further constraints on the gains. It turns out that we can then match these gains with the coefficients of the desired characteristic equation of the closed loop system. In this respect, the gains are linked to the system's overall performance, which is a new and very appealing feature for such a scheme. Finally, a procedure of constructing a common Lyapunov function is provided to prove exponential stability of the aforementioned switched linear system. In addition, using the invariance principle, we will show the convergence of the estimated Coulomb friction coefficient to its real value. Numerical simulations are given to validate the effectiveness of the design and its robustness against friction time‐variations. Compared to existing results, the proposed scheme is much simpler, hence, much more advantageous computationally. Copyright © 2009 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society 相似文献