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   8772篇
  免费   439篇
  国内免费   27篇
电工技术   125篇
综合类   11篇
化学工业   1520篇
金属工艺   284篇
机械仪表   372篇
建筑科学   157篇
矿业工程   3篇
能源动力   341篇
轻工业   616篇
水利工程   27篇
石油天然气   12篇
无线电   1885篇
一般工业技术   1799篇
冶金工业   771篇
原子能技术   103篇
自动化技术   1212篇
  2023年   75篇
  2022年   108篇
  2021年   202篇
  2020年   120篇
  2019年   161篇
  2018年   215篇
  2017年   182篇
  2016年   250篇
  2015年   199篇
  2014年   318篇
  2013年   655篇
  2012年   518篇
  2011年   627篇
  2010年   434篇
  2009年   493篇
  2008年   474篇
  2007年   379篇
  2006年   318篇
  2005年   322篇
  2004年   251篇
  2003年   258篇
  2002年   229篇
  2001年   197篇
  2000年   186篇
  1999年   185篇
  1998年   351篇
  1997年   209篇
  1996年   210篇
  1995年   156篇
  1994年   120篇
  1993年   118篇
  1992年   80篇
  1991年   79篇
  1990年   61篇
  1989年   59篇
  1988年   45篇
  1987年   38篇
  1986年   33篇
  1985年   34篇
  1984年   37篇
  1983年   27篇
  1982年   33篇
  1981年   22篇
  1980年   23篇
  1979年   13篇
  1978年   11篇
  1977年   16篇
  1976年   28篇
  1974年   10篇
  1973年   10篇
排序方式: 共有9238条查询结果,搜索用时 31 毫秒
1.
2.
International Journal of Information Security - This paper deals with a well-known problem in the area of the smudge attacks: when a user draws a pattern to unlock the pattern lock on a smartphone...  相似文献   
3.
Food Science and Biotechnology - Various hilling materials (rice hulls, pine sawdust, and perlite) were compared to produce sprout vegetables using beach silvertop (Glehnia littoralis Fr. Schm. ex...  相似文献   
4.
5.
6.
7.
While exercise training (ET) is an efficient strategy to manage obesity, it is recommended with a dietary plan to maximize the antiobesity functions owing to a compensational increase in energy intake. Capsiate is a notable bioactive compound for managing obesity owing to its capacity to increase energy expenditure. We aimed to examine whether the antiobesity effects of ET can be further enhanced by capsiate intake (CI) and determine its effects on resting energy expenditure and metabolic molecules. Mice were randomly divided into four groups (n = 8 per group) and fed high-fat diet. Mild-intensity treadmill ET was conducted five times/week; capsiate (10 mg/kg) was orally administered daily. After 8 weeks, resting metabolic rate and metabolic molecules were analyzed. ET with CI additively reduced the abdominal fat rate by 18% and solely upregulated beta-3-adrenoceptors in adipose tissue (p = 0.013) but did not affect the metabolic molecules in skeletal muscles. Surprisingly, CI without ET significantly increased the abdominal fat rate (p = 0.001) and reduced energy expenditure by 9%. Therefore, capsiate could be a candidate compound for maximizing the antiobesity effects of ET by upregulating beta-3-adrenoceptors in adipose tissue, but CI without ET may not be beneficial in managing obesity.  相似文献   
8.
Tsay  Ming-yueh  Tseng  Yu-wei  Wu  Tai-luan 《Scientometrics》2019,121(3):1323-1338
Scientometrics - In this study, scholarly communication systems provided by commercial services and open access systems are examined on the basis of the comprehensiveness and uniqueness of their...  相似文献   
9.
Hyperspectral imaging (HSI) is a spectroscopic method that uses densely sampled measurements along the electromagnetic spectrum to identify the unique molecular composition of an object. Traditionally HSI has been associated with remote sensing-type applications, but recently has found increased use in biomedicine, from investigations at the cellular to the tissue level. One of the main challenges in the analysis of HSI is estimating the proportions, also called abundance fractions of each of the molecular signatures. While there is great promise for HSI in the area of biomedicine, large variability in the measurements and artifacts related to the instrumentation has slow adoption into more widespread practice. In this article, we propose a novel regularization and variable selection method called the spatial LASSO (SPLASSO). The SPLASSO incorporates spatial information via a graph Laplacian-based penalty to help improve the model estimation process for multivariate response data. We show the strong performance of this approach on a benchmark HSI dataset with considerable improvement in predictive accuracy over the standard LASSO. Supplementary materials for this article are available online.  相似文献   
10.
Intelligent Service Robotics - A robust control designed for multiple degrees-of-freedom (DOF) robot manipulators performing complex tasks requiring frequent physical interaction with unknown...  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