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   5870篇
  免费   173篇
  国内免费   206篇
电工技术   137篇
综合类   39篇
化学工业   717篇
金属工艺   288篇
机械仪表   86篇
建筑科学   141篇
矿业工程   17篇
能源动力   93篇
轻工业   310篇
水利工程   14篇
石油天然气   331篇
武器工业   13篇
无线电   351篇
一般工业技术   616篇
冶金工业   2497篇
原子能技术   42篇
自动化技术   557篇
  2021年   84篇
  2020年   44篇
  2019年   59篇
  2018年   86篇
  2017年   83篇
  2016年   86篇
  2015年   91篇
  2014年   118篇
  2013年   178篇
  2012年   180篇
  2011年   290篇
  2010年   245篇
  2009年   245篇
  2008年   253篇
  2007年   226篇
  2006年   272篇
  2005年   230篇
  2004年   238篇
  2003年   189篇
  2002年   235篇
  2001年   195篇
  2000年   155篇
  1999年   179篇
  1998年   181篇
  1997年   172篇
  1996年   115篇
  1995年   130篇
  1994年   136篇
  1993年   143篇
  1992年   97篇
  1991年   52篇
  1990年   98篇
  1989年   100篇
  1988年   72篇
  1987年   60篇
  1986年   66篇
  1985年   54篇
  1984年   51篇
  1983年   45篇
  1981年   56篇
  1979年   40篇
  1978年   35篇
  1977年   37篇
  1976年   32篇
  1975年   41篇
  1974年   34篇
  1973年   29篇
  1971年   79篇
  1970年   41篇
  1968年   35篇
排序方式: 共有6249条查询结果,搜索用时 312 毫秒
11.
12.
Presents the 2003 APA Award for Distinguished Scientific Applications of Psychology. A list of the members of the APA committee who selected the recipients for this year and a list of the previous recipients of this award from 1973 through 2003 are provided. The award recipients for 2003 are Stephen J. Ceci and Elizabeth F. Loftus. The award citation, biography, selected bibliography and the award addresses for both award recipients are included. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
13.
The awards for Distinguished Contributions to Psychology in the Public Interest recognize persons who, in the opinion of the Committee on Public Interest Awards, have advanced psychology as a science and/or profession by a single extraordinary achievement or a lifetime of outstanding contributions in the public interest. These contributions might include the identification or solution of significant social problems; unusual initiative or dedication to activity in the public interest; or the integration of the science and/or profession of psychology with social action in a manner beneficial to all. The Committee is authorized to present two awards per year, each with a prize of $2,000. The second award, for which recipients may not have held a Ph.D. for more than 15 years, was established to recognize the large number of excellent psychologists who have made significant contributions to the public interest during the early stages of their careers. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
14.
Presents a brief tribute to Irving B. Harris upon his passing. Harris played a central role in launching the Harris School of Public Policy Studies and the Center for Human Potential and Public Policy at the University of Chicago. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
15.
膏盐岩地层地质特征与录井技术   总被引:2,自引:0,他引:2  
尚锁贵 《录井工程》2006,17(4):10-13
石油勘探实践和研究结果表明,许多油气藏的形成都与膏盐岩地层有关,也常与膏盐岩地层伴生,成功钻穿膏盐岩地层是钻井难题之一,录井技术成为钻进安全监测、膏盐岩地层准确预报的重要手段。针对上述情况,介绍了膏盐岩地层的主要类型、沉积模式以及与油气的关系,归纳总结了膏盐岩地层的录井技术经验,包括:在随钻录井过程中熟悉地质设计与邻井资料;在没有预测钻遇膏盐岩地层的情况下,通过钻井液中Cl^-的变化判定是否钻遇膏盐岩地层;预计钻遇膏盐岩地层时,使用饱和盐水钻井液;钻遇膏盐岩地层后观察盐岩是否以岩屑形式返出;同时,把握膏盐岩地层的岩性、岩性组合、层位、顶底界和厚度是非常重要的。通过S1井实例分析,论述了在膏盐岩地层中钻进时,防卡、防漏是录井人员监测和预报的重点。  相似文献   
16.
Provides the biography of David W. Johnson and announces that he has won the Award for Distinguished Contributions of Applications of Psychology to Education and Training for programmatic research, comprehensive research reviews, and revision of theory over four decades of persistence that have provided the knowledge foundation for cooperative learning, constructive controversy, conflict resolution, and peer mediation training. A selected bibliography is also provided. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
17.
Two proprietary biocides were compounded and extruded at three concentrations, respectively, into high density polyethylene-maple wood flour lumber (HDPE-MWL) and evaluated for their efficacy to control fungal colonization and discoloration using the ASTM Standard G 21-96. Although the silver biocide used in this study did not control fungal colonization and discoloration of HDPE-MWL, statistically significant difference was observed between the highest silver biocide concentration and those of the two lower silver biocide concentrations. The latter exhibited no significant difference with the controls. In contrast, the three levels of zinc biocides showed significant difference from each other with respect to their efficacy against fungal colonization and discoloration of HDPE-MWL. Overall, only the zinc biocide was efficacious against fungal colonization and discoloration. The biocide containing zinc as an active biocidal agent was most efficacious at 1% (by weight) concentration.  相似文献   
18.
Provides the 2007 reports of APA's Regional Associations. Included are the annual meeting reports from the Eastern Psychological Association, Midwestern Psychological Association, New England Psychological Association, Rocky Mountain Psychological Association, Southeastern Psychological Association, Southwestern Psychological Association, and Western Psychological Association. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
19.
20.
Presents the 2003 American Psychological Foundation's Gold Medal Award for Life Achievement in the Science of Psychology, which was presented to Robert Rosenthal. A biography of Rosenthal is provided, along with a selected bibliography and the text of the award citation: "For outstanding scientific contributions that have had a profound influence on research methods, empirical investigations, theory, and applications. Robert Rosenthal's seminal research on interpersonal expectancy inspired hundreds of studies with applications within and beyond psychology. His amplification of experimenter- and subject-related artifacts and his insights about ethical issues have improved the way that research is conducted. His statistical contributions are classic and wide ranging, including his body of work on meta-analysis and contrast analysis and his formulation of valuable procedures, such as the binomial effect-size display and counternull statistics. An exceptional scientist, teacher, mentor, and author, Rosenthal, with his generous and brilliant touch, has shaped the lives and work of countless others." (PsycINFO Database Record (c) 2010 APA, all rights reserved)  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