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   3440篇
  免费   187篇
  国内免费   7篇
电工技术   57篇
综合类   7篇
化学工业   804篇
金属工艺   54篇
机械仪表   66篇
建筑科学   99篇
矿业工程   21篇
能源动力   111篇
轻工业   285篇
水利工程   26篇
石油天然气   19篇
无线电   363篇
一般工业技术   672篇
冶金工业   334篇
原子能技术   35篇
自动化技术   681篇
  2023年   32篇
  2022年   63篇
  2021年   138篇
  2020年   81篇
  2019年   97篇
  2018年   102篇
  2017年   95篇
  2016年   130篇
  2015年   88篇
  2014年   139篇
  2013年   233篇
  2012年   192篇
  2011年   236篇
  2010年   163篇
  2009年   149篇
  2008年   150篇
  2007年   147篇
  2006年   138篇
  2005年   112篇
  2004年   104篇
  2003年   94篇
  2002年   90篇
  2001年   49篇
  2000年   47篇
  1999年   59篇
  1998年   56篇
  1997年   56篇
  1996年   49篇
  1995年   41篇
  1994年   28篇
  1993年   33篇
  1992年   26篇
  1991年   17篇
  1990年   17篇
  1989年   22篇
  1988年   28篇
  1987年   22篇
  1986年   15篇
  1985年   24篇
  1984年   18篇
  1983年   19篇
  1982年   20篇
  1981年   12篇
  1980年   19篇
  1979年   22篇
  1978年   18篇
  1977年   17篇
  1976年   20篇
  1975年   18篇
  1973年   12篇
排序方式: 共有3634条查询结果,搜索用时 15 毫秒
21.
22.
Surveyed 38 rehabilitation counselors to investigate the relationship of experienced burnout to self-concept and job setting. Ss completed the Maslach Burnout Inventory and a questionnaire about their work. The emotional exhaustion component of burnout emerged as the key factor in the results. Emotional exhaustion was related to work overload and a perceived lack of control. It was also linked to dissatisfaction with certain aspects of the job. Findings are consistent with previous theorizing and research on burnout by J. Gaines and J. M. Jermier (see record 1984-10923-001) and C. Maslach and S. E. Jackson (see record 1985-24012-001) and underscore the relevance of this phenomenon for the rehabilitation profession. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
23.
24.
Mortars of blast furnace slag blended with a geothermal silica waste at various replacement levels of 0%, 5%, 10%, 15%, and 20% were cured for up to 90 days. The binder was activated by 6 wt% Na2O equivalent of sodium hydroxide. Lime was added as an activating agent and also to promote pozzolanic reaction with the silica. It was found that the presence of the silica waste increased the reactivity of the cementitious materials, as measured by means of nonevaporable water. The compressive strength was increased in the presence of the silica, except at the highest replacement level of 20%, the optimum silica replacement was that of 5%–10%. The microstructures of blended slag showed less porosity than those of neat slag mortars. The lime was completely consumed after 90 days of hydration.  相似文献   
25.
26.
Working collaboratively, psychologist educators and trainers at the doctoral, internship, and postdoctoral levels; credentialers; practitioners; and students offer 8 proposals for psychologists to consider in recognizing, assessing, and intervening with problems of professional competence in students and practicing professionals. In the proposals, the authors address the following topics: definitions and categories; preparing the system; self-assessment; remediation; diversity; communication across various levels of the system; confidentiality; and ethical, regulatory, and legal underpinnings. They also propose future directions for the assessment of problems in professional competence in both students and practicing psychologists. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
27.
28.
29.
We isolated a mutant defective in C-terminal farnesyl cysteine:carboxyl methyltransferase activity from a screen for mutations causing a -specific sterility. A genomic fragment was cloned from a yeast multi-copy library that restored mating. Both the cloned gene and the sterile mutation were allelic to the STE14 gene. A ste14-complementing 2·17 kb BamHI fragment subclone was sequenced and found to encode a 239 amino acid protein with a molecular weight of 27,887 Daltons. The hydrophobicity profile of the methyltransferase reveals the presence of at least five potential transmembrane domains. In comparisons of the C-terminal methyltransferase amino acid sequence with those in the PIR and Swiss protein databases, no significantly similar sequences were found nor were conserved regions from other methyltransferases present.  相似文献   
30.
This paper describes the development of a conceptual model of an interaction system for future human-computer interaction. It is suggested that an integrated system is the most promising solution for diverse users and tasks. A ' hybrid interaction system' is considered, which tries to efficiently direct manipulation, menu selection, and natural language. The mechanism of the natural language interface module is described in more detail. Finally, the allocation of functionalities for generalized tasks on the conceptual model is considered from the taxonomic approach.  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