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   31402篇
  免费   1040篇
  国内免费   76篇
电工技术   425篇
综合类   41篇
化学工业   5463篇
金属工艺   733篇
机械仪表   697篇
建筑科学   1413篇
矿业工程   130篇
能源动力   837篇
轻工业   3200篇
水利工程   279篇
石油天然气   95篇
无线电   2816篇
一般工业技术   5172篇
冶金工业   6477篇
原子能技术   280篇
自动化技术   4460篇
  2023年   156篇
  2022年   222篇
  2021年   506篇
  2020年   347篇
  2019年   433篇
  2018年   562篇
  2017年   568篇
  2016年   645篇
  2015年   473篇
  2014年   772篇
  2013年   1793篇
  2012年   1265篇
  2011年   1710篇
  2010年   1240篇
  2009年   1255篇
  2008年   1416篇
  2007年   1355篇
  2006年   1155篇
  2005年   1134篇
  2004年   902篇
  2003年   846篇
  2002年   807篇
  2001年   620篇
  2000年   580篇
  1999年   644篇
  1998年   1354篇
  1997年   910篇
  1996年   791篇
  1995年   646篇
  1994年   564篇
  1993年   549篇
  1992年   415篇
  1991年   300篇
  1990年   373篇
  1989年   344篇
  1988年   302篇
  1987年   272篇
  1986年   272篇
  1985年   342篇
  1984年   304篇
  1983年   256篇
  1982年   243篇
  1981年   263篇
  1980年   235篇
  1979年   254篇
  1978年   168篇
  1977年   233篇
  1976年   320篇
  1975年   177篇
  1973年   167篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Fan  Deng-Ping  Huang  Ziling  Zheng  Peng  Liu  Hong  Qin  Xuebin  Van Gool  Luc 《国际自动化与计算杂志》2022,19(4):257-287
Machine Intelligence Research - This paper aims to conduct a comprehensive study on facial-sketch synthesis (FSS). However, due to the high cost of obtaining hand-drawn sketch datasets, there is a...  相似文献   
3.
Number entry is a ubiquitous activity and is often performed in safety- and mission-critical procedures, such as healthcare, science, finance, aviation and in many other areas. We show that Monte Carlo methods can quickly and easily compare the reliability of different number entry systems. A surprising finding is that many common, widely used systems are defective, and induce unnecessary human error. We show that Monte Carlo methods enable designers to explore the implications of normal and unexpected operator behaviour, and to design systems to be more resilient to use error. We demonstrate novel designs with improved resilience, implying that the common problems identified and the errors they induce are avoidable.  相似文献   
4.
5.
6.
The diagnosis and treatment of prostate cancer (PCa) is a major health-care concern worldwide. This cancer can manifest itself in many distinct forms and the transition from clinically indolent PCa to the more invasive aggressive form remains poorly understood. It is now universally accepted that glycan expression patterns change with the cellular modifications that accompany the onset of tumorigenesis. The aim of this study was to investigate if differential glycosylation patterns could distinguish between indolent, significant, and aggressive PCa. Whole serum N-glycan profiling was carried out on 117 prostate cancer patients’ serum using our automated, high-throughput analysis platform for glycan-profiling which utilizes ultra-performance liquid chromatography (UPLC) to obtain high resolution separation of N-linked glycans released from the serum glycoproteins. We observed increases in hybrid, oligomannose, and biantennary digalactosylated monosialylated glycans (M5A1G1S1, M8, and A2G2S1), bisecting glycans (A2B, A2(6)BG1) and monoantennary glycans (A1), and decreases in triantennary trigalactosylated trisialylated glycans with and without core fucose (A3G3S3 and FA3G3S3) with PCa progression from indolent through significant and aggressive disease. These changes give us an insight into the disease pathogenesis and identify potential biomarkers for monitoring the PCa progression, however these need further confirmation studies.  相似文献   
7.
8.
9.
Journal of Mechanical Science and Technology - This study delivers equations useful for low-height pleated fibrous filter design: two pressure drop equations and one set of optimum design equations...  相似文献   
10.
Combined photochemical arylation, “nuisance effect” (SNAr) reaction sequences have been employed in the design of small arrays for immediate deployment in medium-throughput X-ray protein–ligand structure determination. Reactions were deliberately allowed to run “out of control” in terms of selectivity; for example the ortho-arylation of 2-phenylpyridine gave five products resulting from mono- and bisarylations combined with SNAr processes. As a result, a number of crystallographic hits against NUDT7, a key peroxisomal CoA ester hydrolase, have been identified.  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