全文获取类型
收费全文 | 543956篇 |
免费 | 47032篇 |
国内免费 | 29558篇 |
专业分类
电工技术 | 66537篇 |
技术理论 | 55篇 |
综合类 | 56873篇 |
化学工业 | 43778篇 |
金属工艺 | 21241篇 |
机械仪表 | 40113篇 |
建筑科学 | 58794篇 |
矿业工程 | 25061篇 |
能源动力 | 18912篇 |
轻工业 | 23546篇 |
水利工程 | 19685篇 |
石油天然气 | 21695篇 |
武器工业 | 8006篇 |
无线电 | 43892篇 |
一般工业技术 | 32788篇 |
冶金工业 | 23007篇 |
原子能技术 | 4710篇 |
自动化技术 | 111853篇 |
出版年
2024年 | 1816篇 |
2023年 | 5762篇 |
2022年 | 10820篇 |
2021年 | 14336篇 |
2020年 | 14753篇 |
2019年 | 11244篇 |
2018年 | 10345篇 |
2017年 | 14168篇 |
2016年 | 16967篇 |
2015年 | 19090篇 |
2014年 | 35850篇 |
2013年 | 31214篇 |
2012年 | 39533篇 |
2011年 | 43082篇 |
2010年 | 32364篇 |
2009年 | 32835篇 |
2008年 | 32022篇 |
2007年 | 39662篇 |
2006年 | 35784篇 |
2005年 | 31514篇 |
2004年 | 26162篇 |
2003年 | 23220篇 |
2002年 | 18362篇 |
2001年 | 15224篇 |
2000年 | 12925篇 |
1999年 | 10294篇 |
1998年 | 7694篇 |
1997年 | 6592篇 |
1996年 | 5541篇 |
1995年 | 4612篇 |
1994年 | 3829篇 |
1993年 | 2709篇 |
1992年 | 2222篇 |
1991年 | 1601篇 |
1990年 | 1321篇 |
1989年 | 1153篇 |
1988年 | 757篇 |
1987年 | 487篇 |
1986年 | 354篇 |
1985年 | 397篇 |
1984年 | 359篇 |
1983年 | 304篇 |
1982年 | 224篇 |
1981年 | 184篇 |
1980年 | 165篇 |
1979年 | 127篇 |
1978年 | 87篇 |
1977年 | 86篇 |
1976年 | 39篇 |
1959年 | 51篇 |
排序方式: 共有10000条查询结果,搜索用时 578 毫秒
941.
942.
943.
Chia-Jung Pai Author Vitae Author Vitae Yu-Ming Liang Author Vitae Author Vitae Sei-Wang Chen Author Vitae 《Pattern recognition》2004,37(5):1025-1034
This paper presents a system that can perform pedestrian detection and tracking using vision-based techniques. A very important issue in the field of intelligent transportation system is to prevent pedestrians from being hit by vehicles. Recently, a great number of vision-based techniques have been proposed for this purpose. In this paper, we propose a vision-based method, which combines the use of a pedestrian model as well as the walking rhythm of pedestrians to detect and track walking pedestrians. Through integrating some spatial and temporal information grabbed by a vision system, we are able to develop a reliable system that can be used to prevent traffic accidents happened at crossroads. In addition, the proposed system can deal with the occlusion problem. Experimental results obtained by executing some real world cases have demonstrated that the proposed system is indeed superb. 相似文献
944.
V. Rodin Author Vitae A. Benzinou Author VitaeAuthor Vitae P. Ballet Author VitaeAuthor Vitae J. Tisseau Author VitaeAuthor Vitae 《Pattern recognition》2004,37(4):631-645
In this article, we present a parallel image processing system based on the concept of reactive agents. Our system lies in the oRis language, which allows to describe finely and simply the agents’ behaviors to detect image features. We also present a method of segmentation using a multi-agent system, and two biological applications made with oRis. The stopping of this multi-agent system is implemented through a technique issued from immunology: the apoptosis. 相似文献
945.
K.D. Do Author Vitae Z.P. Jiang Author Vitae Author Vitae H. Nijmeijer Author Vitae 《Automatica》2004,40(1):117-124
This paper presents a method to design an output-feedback controller that simultaneously solves global asymptotic stabilization and tracking of an underactuated omni-directional intelligent navigator—a spherical underwater vehicle moving in a horizontal plane (i.e. at a constant depth). The vehicle does not have a sway actuator and has only position and orientation measurements available. The control development is based on Lyapunov's direct method, backstepping technique and use of interconnected structure of the vehicle dynamics. Numerical simulations demonstrate the results. 相似文献
946.
947.
David Angeli Author Vitae 《Automatica》2004,40(3):449-457
The problem of controlling nonlinear noisy systems affected by parametric uncertainties is approached via the introduction of a supervisor which, whenever needed, switches on, in feedback to the plant, a controller selected from a finite set of predesigned controllers. A Lyapunov-based falsification criterion allows one to ensure robust stability in the presence of uncertain constant parameters and exogenous bounded disturbances. Simulations are discussed in order to illustrate the merits of the proposed algorithms. 相似文献
948.
本文运用全面质量管理的方法,对设备故障进行分析,提出预防措施,降低设备故障率,进而取消值班制实现减人增效、系统降本。 相似文献
949.
950.
针对动力厂35t/h锅炉的工艺控制要求,选用SUPMAX500集散控制系统。介绍了系统的软、硬件构成及其具体实施方法。 相似文献