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   1435680篇
  免费   27026篇
  国内免费   6891篇
电工技术   33808篇
综合类   6317篇
化学工业   258463篇
金属工艺   63428篇
机械仪表   40209篇
建筑科学   43837篇
矿业工程   11288篇
能源动力   50012篇
轻工业   103017篇
水利工程   14447篇
石油天然气   36550篇
武器工业   128篇
无线电   193983篇
一般工业技术   274020篇
冶金工业   140300篇
原子能技术   33844篇
自动化技术   165946篇
  2021年   15297篇
  2020年   11752篇
  2019年   14520篇
  2018年   14535篇
  2017年   13763篇
  2016年   20659篇
  2015年   17162篇
  2014年   28541篇
  2013年   87512篇
  2012年   33860篇
  2011年   45339篇
  2010年   41163篇
  2009年   49968篇
  2008年   42689篇
  2007年   39605篇
  2006年   43344篇
  2005年   37878篇
  2004年   40307篇
  2003年   40246篇
  2002年   39552篇
  2001年   35990篇
  2000年   34721篇
  1999年   33364篇
  1998年   37551篇
  1997年   34392篇
  1996年   30014篇
  1995年   28518篇
  1994年   26917篇
  1993年   26796篇
  1992年   25133篇
  1991年   22257篇
  1990年   22724篇
  1989年   21644篇
  1988年   20155篇
  1987年   18591篇
  1986年   17932篇
  1985年   21305篇
  1984年   21705篇
  1983年   19662篇
  1982年   18761篇
  1981年   18848篇
  1980年   17497篇
  1979年   18089篇
  1978年   17364篇
  1977年   16844篇
  1976年   17254篇
  1975年   15674篇
  1974年   15225篇
  1973年   15320篇
  1972年   12869篇
排序方式: 共有10000条查询结果,搜索用时 875 毫秒
141.
Mosquito-borne Zika virus (ZIKV) became a real threat to human health due to the lack of vaccine and effective antiviral treatment. The virus has recently been responsible for a global outbreak leading to millions of infected cases. ZIKV complications were highlighted in adults with Guillain–Barré syndrome and in newborns with increasing numbers of congenital disorders ranging from mild developmental delays to fatal conditions. The ability of ZIKV to establish a long-term infection in diverse organs including the kidneys has been recently documented but the consequences of such a viral infection are still debated. Our study aimed to determine whether the efficiency of ZIKV growth in kidney cells relates to glucose concentration. Human kidney HK-2 cells were infected with different ZIKV strains in presence of normal and high glucose concentrations. Virological assays showed a decrease in viral replication without modifying entry steps (viral binding, internalization, fusion) under high glucose conditions. This decrease replication was associated with a lower virus progeny and increased cell viability when compared to ZIKV-infected HK-2 cells in normal glucose concentration. In conclusion, we showed for the first time that an elevated glucose level influences ZIKV replication level with an effect on kidney cell survival.  相似文献   
142.
Multimedia Tools and Applications - Discovering the relevant web services for specific applications in the dynamically changing business world becomes very critical. Researchers have used many...  相似文献   
143.
Journal of Materials Science - For transformers and inductors to meet the world’s growing demand for electrical power, more efficient soft magnetic materials with high saturation magnetic...  相似文献   
144.
Mobile Networks and Applications - 5G/6G communication are first generation high speed wireless communication network which integrates the aerial data, terrestrial data and maritime data via...  相似文献   
145.
146.
Theoretical Foundations of Chemical Engineering - The effect of the electrolyte composition, mass-transfer conditions, pore diameter, interpore distance, and electric parameters on the formation of...  相似文献   
147.
Fluoro-substituted and heteroaromatic compounds are valuable intermediates for a variety of applications in pharma- and agrochemistry and synthetic chemistry. This study investigates the chemoenzymatic preparation of chiral alcohols bearing a heteroaromatic ring with an increasing degree of fluorination in α-position. Starting from readily available picoline derivatives prochiral α-halogenated acyl moieties were introduced with excellent selectivity and 64–95 % yield. The formed carbonyl group was subsequently reduced to the corresponding alcohols using the alcohol dehydrogenase from Lactobacillus kefir, yielding an enantiomeric excess of 95–>99 % and up to 98 % yield.  相似文献   
148.
Journal of Inorganic and Organometallic Polymers and Materials - This paper reports the performance of alizarin based SnO2 dye-sensitized solar cells. A novel template assisted method has been...  相似文献   
149.
Applied Composite Materials - Determining the impact behavior of adhesive joints allows the designing of high-strength joints. Therefore, the dynamic behavior of adhesive joints has recently become...  相似文献   
150.
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