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   7414篇
  免费   480篇
  国内免费   21篇
电工技术   95篇
综合类   11篇
化学工业   1469篇
金属工艺   271篇
机械仪表   401篇
建筑科学   138篇
矿业工程   1篇
能源动力   302篇
轻工业   589篇
水利工程   25篇
石油天然气   12篇
无线电   1535篇
一般工业技术   1511篇
冶金工业   523篇
原子能技术   132篇
自动化技术   900篇
  2024年   7篇
  2023年   79篇
  2022年   121篇
  2021年   186篇
  2020年   123篇
  2019年   169篇
  2018年   213篇
  2017年   201篇
  2016年   271篇
  2015年   197篇
  2014年   296篇
  2013年   544篇
  2012年   470篇
  2011年   579篇
  2010年   388篇
  2009年   448篇
  2008年   394篇
  2007年   310篇
  2006年   276篇
  2005年   282篇
  2004年   199篇
  2003年   203篇
  2002年   198篇
  2001年   153篇
  2000年   149篇
  1999年   131篇
  1998年   258篇
  1997年   142篇
  1996年   141篇
  1995年   124篇
  1994年   86篇
  1993年   92篇
  1992年   64篇
  1991年   54篇
  1990年   48篇
  1989年   48篇
  1988年   31篇
  1987年   31篇
  1986年   24篇
  1985年   21篇
  1984年   23篇
  1983年   19篇
  1982年   22篇
  1981年   13篇
  1980年   17篇
  1979年   6篇
  1978年   6篇
  1977年   8篇
  1976年   13篇
  1975年   9篇
排序方式: 共有7915条查询结果,搜索用时 15 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.
8.
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   
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