首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   904篇
  免费   46篇
  国内免费   6篇
电工技术   13篇
综合类   1篇
化学工业   220篇
金属工艺   28篇
机械仪表   41篇
建筑科学   31篇
能源动力   75篇
轻工业   59篇
水利工程   9篇
石油天然气   1篇
无线电   86篇
一般工业技术   217篇
冶金工业   58篇
原子能技术   7篇
自动化技术   110篇
  2024年   5篇
  2023年   18篇
  2022年   28篇
  2021年   50篇
  2020年   37篇
  2019年   38篇
  2018年   61篇
  2017年   46篇
  2016年   48篇
  2015年   30篇
  2014年   38篇
  2013年   87篇
  2012年   45篇
  2011年   52篇
  2010年   49篇
  2009年   50篇
  2008年   43篇
  2007年   40篇
  2006年   20篇
  2005年   14篇
  2004年   15篇
  2003年   16篇
  2002年   12篇
  2001年   8篇
  2000年   9篇
  1999年   5篇
  1998年   9篇
  1997年   10篇
  1996年   8篇
  1995年   9篇
  1994年   11篇
  1993年   6篇
  1992年   2篇
  1991年   3篇
  1990年   2篇
  1989年   3篇
  1987年   2篇
  1986年   3篇
  1985年   2篇
  1984年   5篇
  1983年   1篇
  1982年   3篇
  1981年   1篇
  1980年   3篇
  1979年   4篇
  1977年   2篇
  1976年   1篇
  1974年   1篇
  1973年   1篇
排序方式: 共有956条查询结果,搜索用时 0 毫秒
1.
Multimedia Tools and Applications - Discovering the relevant web services for specific applications in the dynamically changing business world becomes very critical. Researchers have used many...  相似文献   
2.
Wireless Personal Communications - In this paper, cooperative communication (CC) assisted cognitive wireless sensor network (CWSN) is presented for monitoring health and activity of an end-user in...  相似文献   
3.
4.
5.
Neural Computing and Applications - To obtain the optimal set of features in feature selection problems is the most challenging and prominent problem in machine learning. Very few human-related...  相似文献   
6.
7.
8.
The role of myelin basic protein (MBP) T cell recognition in the induction of experimental allergic encephalomyelitis (EAE) has been well established in mice and rats. A remarkable restriction has been observed in T cell receptor (TCR) genes utilized by encephalitogenic T cell lines (TCLs) specific for immunodominant epitopes in these species. Pathological similarities between this animal model and multiple sclerosis (MS) has led to consider MBP as a major candidate autoantigen in this human disorder. Unlike in inbred strains of animals, the T cell response to MBP in humans is quite heterogenous with regard to fine epitope specificity. The existence of V alpha and/or V beta restriction in MBP-specific T cells, from MS patients and healthy controls, is still a matter of debate. In this study we generated 77 MBP-specific TCLs from nine healthy donors and showed that peptide 7-27 is one of the most frequently recognized epitopes. 37% of all epitope-specific TCLs recognized this peptide and p7-27 specific TCLs were generated from seven out of the nine subjects studied. A high level of in vivo clonal expansion was observed in p7-27-specific TCLs in several subjects, which however is not specific of this epitope since this phenomenon was also observed in p85-104- and 149-162-specific TCLs.  相似文献   
9.
Three plain weave fabric composite analysis models are presented for the prediction of the on-axes thermal expansion coefficients. These are two-dimensional models in the sense that the actual strand cross-sectional geometry, strand undulation and the presence of a gap between the adjacent strands are taken into account. In the first two models, termed refined models, the representative unit cell is discretised into slices and elements and analysed. In the third method, a closed-form solution is presented. In this case, the representative unit cell is idealised as a crossply laminate and analysed. The relative merits and demerits of the models are also discussed. The predicted results are compared with the experimental values. A good correlation is observed.  相似文献   
10.
This paper presents the results of an experimental and analytical comparison of a study on the flexural behavior of concrete beams reinforced with sandblasted carbon fiber-based composite rods. Twelve beams, including three control beams reinforced with steel, were tested for strength, deformation, and failure characteristics. Analytical comparisons included the generation of the theoretical strength and moment curvature relations. Experimental data from pullout tests indicated that bonding of sandblasted rods is not a major concern. However, excessive deformation in achieving the predicted moment capacity could be a limiting factor in the design of these beams.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号