全文获取类型
收费全文 | 362123篇 |
免费 | 3977篇 |
国内免费 | 1448篇 |
学科分类
工业技术 | 367548篇 |
出版年
2021年 | 2253篇 |
2019年 | 2196篇 |
2018年 | 11491篇 |
2017年 | 12022篇 |
2016年 | 8373篇 |
2015年 | 3103篇 |
2014年 | 4697篇 |
2013年 | 12713篇 |
2012年 | 9853篇 |
2011年 | 17966篇 |
2010年 | 15354篇 |
2009年 | 15399篇 |
2008年 | 15663篇 |
2007年 | 17547篇 |
2006年 | 8393篇 |
2005年 | 11129篇 |
2004年 | 9463篇 |
2003年 | 8998篇 |
2002年 | 7895篇 |
2001年 | 7475篇 |
2000年 | 7102篇 |
1999年 | 7293篇 |
1998年 | 18087篇 |
1997年 | 12713篇 |
1996年 | 9440篇 |
1995年 | 7415篇 |
1994年 | 6491篇 |
1993年 | 6571篇 |
1992年 | 4658篇 |
1991年 | 4452篇 |
1990年 | 4346篇 |
1989年 | 4280篇 |
1988年 | 3961篇 |
1987年 | 3564篇 |
1986年 | 3560篇 |
1985年 | 3910篇 |
1984年 | 3607篇 |
1983年 | 3352篇 |
1982年 | 3158篇 |
1981年 | 3195篇 |
1980年 | 3167篇 |
1979年 | 2944篇 |
1978年 | 2970篇 |
1977年 | 3366篇 |
1976年 | 4435篇 |
1975年 | 2508篇 |
1974年 | 2456篇 |
1973年 | 2478篇 |
1972年 | 2087篇 |
1971年 | 1829篇 |
排序方式: 共有10000条查询结果,搜索用时 296 毫秒
991.
In this paper, we analyze in some detail the manifold-mapping optimization technique introduced recently [Echeverría and Hemker in space mapping and defect correction. Comput Methods Appl Math 5(2): 107—136, 2005]. Manifold mapping aims at accelerating optimal design procedures that otherwise require many evaluations of time-expensive cost functions. We give a proof of convergence for the manifold-mapping iteration. By means of two simple optimization problems we illustrate the convergence results derived. Finally, the performances of several variants of the method are compared for some design problems from electromagnetics. 相似文献
992.
Stevens M. Williams P.D. Peterson G.L. Kurkowski S.H. 《Computational Intelligence Magazine, IEEE》2008,3(2):65-68
This research supports the hypothesis that the Trust Vector model can be modified to fit the CyberCraft Initiative, and that there are limits to the utility of historical data. This research proposed some modifications and expansions to the Trust Model Vector, and identified areas for future research. 相似文献
993.
994.
John P. kotter 《IT时代周刊》2007,(24):76-77
在拥有了多年大权在握、呼风唤雨的经历之后。相当一部分企业领导人很难从容地放弃权力。这时。董事会必须采取行动,不仅要帮助退休领导人选择和培养好接班人。更要积极参与管理层交接班的全过程。 相似文献
995.
Amnon H. Eden 《Minds and Machines》2007,17(1):121-123
996.
Entrainment and musicality in the human system interface 总被引:1,自引:1,他引:0
Satinder P. Gill 《AI & Society》2007,21(4):567-605
What constitutes our human capacity to engage and be in the same frame of mind as another human? How do we come to share a sense of what ‘looks good’ and what ‘makes sense’? How do we handle differences and come to coexist with them? How do we come to feel that we understand what someone else is experiencing? How are we able to walk in silence with someone familiar and be sharing a peaceful space? All of these aspects are part of human ‘interaction’. In designing interactive technologies designers have endeavoured to explicate, analyse and simulate, our capacity for social adaptation. Their motivations are mixed and include the desires to improve efficiency, improve consumption, to connect people, to make it easier for people to work together, to improve education and learning. In these endeavours to explicate, analyse and simulate, there is a fundamental human capacity that is beyond technology and that facilitates these aspects of being, feeling and thinking with others. That capacity, we suggest, is human entrainment. This is our ability to coordinate the timing of our behaviours and rhythmically synchronise our attentional resources. Expressed within the movements of our bodies and voices, it has a quality that is akin to music. In this paper, disparate domains of research such as pragmatics, social psychology, behaviourism, cognitive science, computational linguistics, gesture, are brought together, and considered in light of the developments in interactive technology, in order to shape a conceptual framework for understanding entrainment in everyday human interaction. 相似文献
997.
Yu. P. Nikolaev 《Automation and Remote Control》2004,65(12):1904-1914
The D-decomposition of a two-dimensional plane of arbitrary coefficients of a discrete characteristic polynomial is studied. The geometry of the boundary curve is analyzed and its common properties with a linear discrete system of any order are described. Example are given. 相似文献
998.
V. P. Shmerko 《Automation and Remote Control》2004,65(6):893-912
Theoretical results due to V. Malyugin on linearization of arithmetical models of logical functions are interpreted and refined from the viewpoint of modern techniques of logical design of integral circuits and nearest neighbor technologies. 相似文献
999.
Necessary and sufficient condition for the stabilizability of linear discrete systems by a static output feedback control are formulated and used in designing algorithms for robust stabilizing controls and controls that ensure concurrent stabilization of a family of discrete systems. Algorithms are implemented by MATLAB and SCILAB with LMISOLVER and SeDuMi interfaces. The results are generalized to random-structure systems. 相似文献
1000.
Abstract A comparison of three different but related numerical methods for control constrained optimal control of the Burgers equation is carried out. We develop the principal ideas of the different strategies considered and present detailed numerical examples. Lastly, conclusions about the behavior of the approaches are obtained. 相似文献