全文获取类型
收费全文 | 12332篇 |
免费 | 143篇 |
国内免费 | 197篇 |
专业分类
电工技术 | 176篇 |
综合类 | 81篇 |
化学工业 | 517篇 |
金属工艺 | 655篇 |
机械仪表 | 180篇 |
建筑科学 | 367篇 |
矿业工程 | 41篇 |
能源动力 | 159篇 |
轻工业 | 106篇 |
水利工程 | 64篇 |
石油天然气 | 51篇 |
武器工业 | 1篇 |
无线电 | 556篇 |
一般工业技术 | 446篇 |
冶金工业 | 208篇 |
原子能技术 | 97篇 |
自动化技术 | 8967篇 |
出版年
2024年 | 3篇 |
2023年 | 28篇 |
2022年 | 30篇 |
2021年 | 41篇 |
2020年 | 36篇 |
2019年 | 40篇 |
2018年 | 50篇 |
2017年 | 48篇 |
2016年 | 59篇 |
2015年 | 34篇 |
2014年 | 277篇 |
2013年 | 307篇 |
2012年 | 833篇 |
2011年 | 3176篇 |
2010年 | 1176篇 |
2009年 | 1043篇 |
2008年 | 722篇 |
2007年 | 611篇 |
2006年 | 484篇 |
2005年 | 634篇 |
2004年 | 665篇 |
2003年 | 719篇 |
2002年 | 381篇 |
2001年 | 325篇 |
2000年 | 248篇 |
1999年 | 79篇 |
1998年 | 136篇 |
1997年 | 75篇 |
1996年 | 46篇 |
1995年 | 74篇 |
1994年 | 61篇 |
1993年 | 17篇 |
1992年 | 20篇 |
1991年 | 16篇 |
1990年 | 21篇 |
1989年 | 30篇 |
1988年 | 12篇 |
1987年 | 9篇 |
1986年 | 14篇 |
1985年 | 12篇 |
1984年 | 31篇 |
1983年 | 15篇 |
1982年 | 6篇 |
1981年 | 8篇 |
1980年 | 2篇 |
1979年 | 5篇 |
1978年 | 2篇 |
1976年 | 5篇 |
1974年 | 2篇 |
1959年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
1.
Yang Chao-Tung Chen Shuo-Tsung Liu Jung-Chun Chan Yu-Wei Chen Chien-Chih Verma Vinod Kumar 《The Journal of supercomputing》2019,75(8):4408-4429
The Journal of Supercomputing - In the last decade, cloud computing has brought enormous changes to people’s lives. Cloud computing gives a client-driven computational model. In this case,... 相似文献
2.
A Synthetic Transcriptional Activator of Genes Associated with the Retina in Human Dermal Fibroblasts
下载免费PDF全文
![点击此处可从《Chembiochem : a European journal of chemical biology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
3.
4.
Navab SinghAuthor Vitae Moitreyee Mukherjee-RoyAuthor VitaeSohan Singh MehtaAuthor Vitae 《Microelectronics Journal》2003,34(4):237-245
The patterning of contact holes by selecting out-of-focus image plane (defocus) using attenuated phase shift masks (APSM) has been studied. Defocus is found to enhance the image modulation at low partial coherence for contact holes with negative local average of mask function. Semi-dense holes up to 130 nm in 8% APSM have been printed by 0.5 μm defocus at a partial coherence of 0.31 using KrF scanner with highest numerical aperture of 0.68. However, these holes were closed with in-focus imaging. Defocus is also found to be beneficial for patterning the pitches that have extensive side lobes with in-focus imaging. 相似文献
5.
用仿真工具优化车辆动力系统(一) 总被引:1,自引:0,他引:1
在本文的第一部分,介绍了一种理想的车辆动力系统的计算机辅助开发过程。它显示了现代仿真技术在产品持续发展过程中的作用,该技术采用硬件回路作非在线的仿真,并通过现代化的试验手段对车辆进行匹配。特别重要的是提供了将电控变速器和发动机控制单元综合的可能性。接着是在线仿真在诸如发动机和变速器模式方面的应用和发展,它是上述开发过程的基础。根据上述的方法论,本文论述了仿真技术已取得的成绩和将来的应用可能性。 相似文献
6.
A stochastic realization problem of a stationary stochastic process is re-visited, and a new stochastically balanced realization algorithm is derived in a Hilbert space generated by second-order stationary processes. The present algorithm computes a stochastically balanced realization by means of the singular value decomposition of a weighted block Hankel matrix derived by a “block LQ decomposition”. Extension to a stochastic subspace identification method explains how the proposed abstract algorithm is implemented in system identification. 相似文献
7.
8.
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
9.
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
10.
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