首页 | 官方网站   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   22661篇
  免费   486篇
  国内免费   88篇
工业技术   23235篇
  2023年   74篇
  2022年   296篇
  2021年   577篇
  2020年   435篇
  2019年   610篇
  2018年   1173篇
  2017年   1215篇
  2016年   1461篇
  2015年   854篇
  2014年   1232篇
  2013年   1637篇
  2012年   1478篇
  2011年   1394篇
  2010年   1347篇
  2009年   1521篇
  2008年   1410篇
  2007年   1344篇
  2006年   1049篇
  2005年   643篇
  2004年   427篇
  2003年   243篇
  2002年   206篇
  2001年   189篇
  2000年   498篇
  1999年   373篇
  1998年   371篇
  1997年   365篇
  1996年   80篇
  1995年   46篇
  1994年   47篇
  1993年   34篇
  1992年   35篇
  1991年   24篇
  1990年   31篇
  1989年   19篇
  1987年   17篇
  1986年   15篇
  1985年   37篇
  1984年   33篇
  1983年   19篇
  1982年   17篇
  1981年   17篇
  1980年   18篇
  1979年   23篇
  1978年   25篇
  1977年   20篇
  1976年   25篇
  1973年   16篇
  1969年   28篇
  1968年   17篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
Journal of Computer and Systems Sciences International - A method for the synthesis of fast finite state machines on programmable logic integrated circuits such as field-programmable gate arrays is...  相似文献   
2.
Inorganic Materials - We have studied the effect of annealing on the chemical and physical properties of mineral-like host matrices for immobilization of the rare-earth–actinide fraction from...  相似文献   
3.
Russian Journal of Nondestructive Testing - We study the possibilities of reducing the location error of acoustic emission (AE) sources for cases where AE sources are located near AE receiving...  相似文献   
4.
Russian Engineering Research - A system for predicting the machining error for a batch of parts in CNC wheel grinding is described; the system takes the influence of technological variables into...  相似文献   
5.
Journal of Engineering Physics and Thermophysics - The possibility of intensifying the drying of materials by noncontact ultrasonic action at a frequency of 22 kHz at sound pressure levels up to...  相似文献   
6.
This research aimed at studying the potential use of monoglyceride (MG) structured emulsions (MSEs) as delivery and protective systems for probiotic bacteria in Ricotta cheese. To this purpose, a low-fat commercial Ricotta cheese was added with MSEs formulated with milk, as water phase, and sunflower oil (MSE-SO) or anhydrous milk fat (MSE-AMF), as lipid phase. A commercial whole milk Ricotta cheese (W-RC) was considered as reference. A probiotic Lacticaseibacillus rhamnosus strain was inoculated as free cells in W-RC or embedded into the MSEs and added to the low-fat Ricotta at the same reference fat content. After physico-chemical characterisation, L. rhamnosus viability and sample destructuring behaviour upon in vitro digestion were evaluated. At the end of in vitro digestion, both W-RC and sample containing MSE-SO were unable to protect cells. By contrast, sample with AMF ensured a sufficient probiotic viability, even after 14 days of storage at 4 °C. This result was attributed to system composition and structure. During the gastric phase, the presence of caseins and MG-AMF mixed structures induced the formation of clots, entrapping and protecting cells against the acidic pH of the stomach, as confirmed by confocal micrographs and particle size. During the intestinal phase, cell viability was guaranteed by the formation of mixed micelles promoted by MG. It was demonstrated that microbial cells located near MG structures where they found protection.  相似文献   
7.
Semiconductors - Abstract—In our work, we carry out a structural-spectroscopic study of AlGaN/GaN epitaxial layers grown by molecular-beam epitaxy with nitrogen-plasma activation on a hybrid...  相似文献   
8.
Wireless Personal Communications - Current mobile communications technology relies heavily on efficient design of antennas, where the operational characteristics of the wireless communication...  相似文献   
9.
10.
Protection of Metals and Physical Chemistry of Surfaces - Abstract—The ability of improving the protective properties of layers formed on zinc in the presence of sodium dodecylphosphonate...  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-23

京公网安备 11010802026262号