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   6280篇
  免费   370篇
  国内免费   19篇
电工技术   77篇
综合类   10篇
化学工业   1094篇
金属工艺   237篇
机械仪表   319篇
建筑科学   122篇
矿业工程   1篇
能源动力   269篇
轻工业   511篇
水利工程   24篇
石油天然气   12篇
无线电   1345篇
一般工业技术   1271篇
冶金工业   500篇
原子能技术   87篇
自动化技术   790篇
  2023年   65篇
  2022年   41篇
  2021年   156篇
  2020年   94篇
  2019年   130篇
  2018年   172篇
  2017年   153篇
  2016年   199篇
  2015年   162篇
  2014年   243篇
  2013年   457篇
  2012年   384篇
  2011年   484篇
  2010年   328篇
  2009年   380篇
  2008年   327篇
  2007年   278篇
  2006年   230篇
  2005年   238篇
  2004年   169篇
  2003年   181篇
  2002年   168篇
  2001年   130篇
  2000年   130篇
  1999年   115篇
  1998年   243篇
  1997年   131篇
  1996年   126篇
  1995年   118篇
  1994年   80篇
  1993年   87篇
  1992年   58篇
  1991年   54篇
  1990年   45篇
  1989年   43篇
  1988年   31篇
  1987年   29篇
  1986年   23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
  1971年   5篇
排序方式: 共有6669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.
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.
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   
9.
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   
10.
Wireless Personal Communications - In the formulating of power control for wireless networks, the radio channel is commonly formulated using static models of optimization or game theory. In these...  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