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   7449篇
  免费   339篇
  国内免费   17篇
电工技术   110篇
技术理论   1篇
综合类   10篇
化学工业   1484篇
金属工艺   136篇
机械仪表   107篇
建筑科学   360篇
矿业工程   7篇
能源动力   216篇
轻工业   464篇
水利工程   50篇
石油天然气   114篇
武器工业   1篇
无线电   784篇
一般工业技术   1348篇
冶金工业   1521篇
原子能技术   59篇
自动化技术   1033篇
  2021年   97篇
  2020年   80篇
  2019年   97篇
  2018年   111篇
  2017年   98篇
  2016年   146篇
  2015年   154篇
  2014年   160篇
  2013年   541篇
  2012年   304篇
  2011年   330篇
  2010年   265篇
  2009年   278篇
  2008年   311篇
  2007年   327篇
  2006年   273篇
  2005年   264篇
  2004年   226篇
  2003年   204篇
  2002年   199篇
  2001年   127篇
  2000年   128篇
  1999年   131篇
  1998年   133篇
  1997年   122篇
  1996年   149篇
  1995年   115篇
  1994年   104篇
  1993年   111篇
  1992年   101篇
  1991年   80篇
  1990年   86篇
  1989年   106篇
  1988年   84篇
  1987年   99篇
  1986年   92篇
  1985年   116篇
  1984年   123篇
  1983年   86篇
  1982年   75篇
  1981年   91篇
  1980年   69篇
  1979年   100篇
  1978年   70篇
  1977年   81篇
  1976年   57篇
  1975年   70篇
  1974年   59篇
  1973年   79篇
  1972年   54篇
排序方式: 共有7805条查询结果,搜索用时 31 毫秒
1.
Kuo  Shu-Chun  Chien  Tsair-Wei  Chou  Willy 《Scientometrics》2022,127(2):1191-1194
Scientometrics - The article published on 5 July 2021 is well-written and of interest. However, some improvements could be made, such as ten Tables/Figures can be shortened to highlight the focused...  相似文献   
2.
3.
Abstract

Industry 4.0 aims at providing a digital representation of a production landscape, but the challenges in building, maintaining, optimizing, and evolving digital models in inter-organizational production chains have not been identified yet in a systematic manner. In this paper, various Industry 4.0 research and technical challenges are addressed, and their present scenario is discussed. Moreover, in this article, the novel concept of developing experience-based virtual models of engineering entities, process, and the factory is presented. These models of production units, processes, and procedures are accomplished by virtual engineering object (VEO), virtual engineering process (VEP), and virtual engineering factory (VEF), using the knowledge representation technique of Decisional DNA. This blend of the virtual and physical domains permits monitoring of systems and analysis of data to foresee problems before they occur, develop new opportunities, prevent downtime, and even plan for the future by using simulations. Furthermore, the proposed virtual model concept not only has the capability of Query Processing and Data Integration for Industrial Data but also real-time visualization of data stream processing.  相似文献   
4.
We investigate the challenges of building an end-to-end cloud pipeline for real-time intelligent visual inspection system for use in automotive manufacturing. Current methods of visual detection in automotive assembly are highly labor intensive, and thus prone to errors. An automated process is sought that can operate within the real-time constraints of the assembly line and can reduce errors. Components of the cloud pipeline include capture of a large set of high-definition images from a camera setup at the assembly location, transfer and storage of the images as needed, execution of object detection, and notification to a human operator when a fault is detected. The end-to-end execution must complete within a fixed time frame before the next car arrives in the assembly line. In this article, we report the design, development, and experimental evaluation of the tradeoffs of performance, accuracy, and scalability for a cloud system.  相似文献   
5.
6.
7.
8.
9.
Passive permeability is a key property in drug disposition and delivery. It is critical for gastrointestinal absorption, brain penetration, renal reabsorption, defining clearance mechanisms and drug-drug interactions. Passive diffusion rate is translatable across tissues and animal species, while the extent of absorption is dependent on drug properties, as well as in vivo physiology/pathophysiology. Design principles have been developed to guide medicinal chemistry to enhance absorption, which combine the balance of aqueous solubility, permeability and the sometimes unfavorable compound characteristic demanded by the target. Permeability assays have been implemented that enable rapid development of structure-permeability relationships for absorption improvement. Future advances in assay development to reduce nonspecific binding and improve mass balance will enable more accurately measurement of passive permeability. Design principles that integrate potency, selectivity, passive permeability and other ADMET properties facilitate rapid advancement of successful drug candidates to patients.  相似文献   
10.
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