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   1604334篇
  免费   27858篇
  国内免费   7065篇
电工技术   35359篇
综合类   6469篇
化学工业   274728篇
金属工艺   66580篇
机械仪表   47205篇
建筑科学   48393篇
矿业工程   11940篇
能源动力   50516篇
轻工业   123743篇
水利工程   16453篇
石油天然气   38432篇
武器工业   157篇
无线电   200609篇
一般工业技术   303055篇
冶金工业   206043篇
原子能技术   34726篇
自动化技术   174849篇
  2021年   15549篇
  2020年   11951篇
  2019年   14752篇
  2018年   19318篇
  2017年   19170篇
  2016年   23213篇
  2015年   17688篇
  2014年   28794篇
  2013年   88262篇
  2012年   38592篇
  2011年   54081篇
  2010年   46352篇
  2009年   54113篇
  2008年   49481篇
  2007年   47618篇
  2006年   46903篇
  2005年   42968篇
  2004年   44087篇
  2003年   43697篇
  2002年   42321篇
  2001年   39139篇
  2000年   37284篇
  1999年   36834篇
  1998年   57811篇
  1997年   47230篇
  1996年   40480篇
  1995年   33947篇
  1994年   31309篇
  1993年   31083篇
  1992年   26983篇
  1991年   24267篇
  1990年   24510篇
  1989年   23650篇
  1988年   22116篇
  1987年   20279篇
  1986年   19732篇
  1985年   23086篇
  1984年   22762篇
  1983年   20754篇
  1982年   19571篇
  1981年   19695篇
  1980年   18381篇
  1979年   18811篇
  1978年   17992篇
  1977年   18497篇
  1976年   20394篇
  1975年   16222篇
  1974年   15661篇
  1973年   15802篇
  1972年   13134篇
排序方式: 共有10000条查询结果,搜索用时 46 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