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   5330篇
  免费   179篇
  国内免费   9篇
电工技术   55篇
综合类   1篇
化学工业   989篇
金属工艺   91篇
机械仪表   87篇
建筑科学   302篇
矿业工程   18篇
能源动力   138篇
轻工业   479篇
水利工程   43篇
石油天然气   32篇
武器工业   1篇
无线电   302篇
一般工业技术   874篇
冶金工业   1137篇
原子能技术   22篇
自动化技术   947篇
  2023年   29篇
  2021年   81篇
  2020年   74篇
  2019年   63篇
  2018年   92篇
  2017年   73篇
  2016年   122篇
  2015年   88篇
  2014年   167篇
  2013年   354篇
  2012年   246篇
  2011年   324篇
  2010年   228篇
  2009年   195篇
  2008年   270篇
  2007年   240篇
  2006年   200篇
  2005年   197篇
  2004年   148篇
  2003年   138篇
  2002年   133篇
  2001年   83篇
  2000年   73篇
  1999年   89篇
  1998年   146篇
  1997年   132篇
  1996年   68篇
  1995年   81篇
  1994年   63篇
  1993年   72篇
  1992年   82篇
  1991年   46篇
  1990年   51篇
  1989年   54篇
  1988年   59篇
  1987年   51篇
  1986年   60篇
  1985年   73篇
  1984年   61篇
  1983年   70篇
  1982年   50篇
  1981年   39篇
  1980年   45篇
  1979年   65篇
  1978年   51篇
  1977年   47篇
  1976年   42篇
  1975年   41篇
  1973年   27篇
  1965年   25篇
排序方式: 共有5518条查询结果,搜索用时 15 毫秒
31.
Describes the history and evolution of the Department of Psychology at the Fayetteville campus of the University of Arkansas and discusses the contributions of the persons influential in the evolution. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
32.
T. Rocklin (see record 1994-29650-001) examined the relations between M. Goff and P. L. Ackerman's (see record 1993-13529-001) measure of typical intellectual engagement (TIE) and a personality test measure of Openness. Rocklin's arguments are examined in the context of 3 themes: philosophical issues, TIE and Openness from a facet perspective, and the bandwidth-fidelity dilemma. Although Rocklin raised important issues about these constructs, it is demonstrated that measures of TIE and Openness, although significantly related, are theoretically and empirically distinguishable. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
33.
Continuous surface boundaries, object shape, and global motion can be perceived from information that is fragmentary in both space and time. The authors report investigations indicating that accretion and deletion of texture is only 1 member of a broader class of element transformations that produce boundaries, shape, and motion, through spatiotemporal boundary formation (SBF). Four experiments exploring SBF are reported. The 1st 3 examine the class of transformations producing SBF, indicating that local element changes in color, orientation, or location are all effective. A 4th experiment examines temporal constraints on SBF. Integration of local element changes to produce boundaries, form, and global motion appears to be confined to a 165-msec window. Two classes of spatiotemporal integration models are considered; the relation between SBF and other cases of boundary interpolation are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
34.
Political economists agree that a trade-off exists between equality and efficiency. Using a hypothetical society paradigm, the mean income (representing efficiency) and income variability (representing equality) of distributions of wealth and the correlation between wealth and effort within a society were manipulated. Ss made all pairwise comparisons of distributions within societies of differing meritocracy. A "maximin" principle best described trade-off resolution strategies when effort and outcome were weakly linked: People maximized the minimum standard of living within a society. A compromise principle best described preferences when income was tightly linked to effort: People rejected distributions in which some citizens fell below the "poverty line" but maximized efficiency above this constraint. Ideological polarization was pronounced under moderate meritocracy; here liberals could focus on the role of chance and conservatives on the role of effort and ability. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
35.
Electron-impact excitation cross sections are presented for the dipole- and spin allowed transitions from the ground states to the np 2P states for hydrogen and lithium, and to the 1snp 1P states for helium, n = 2 through 10. Two scaling formulas developed earlier by Kim [Phys. Rev. A 64, 032713 (2001)] for plane-wave Born cross sections are used. The scaled Born cross sections are in excellent agreement with available theoretical and experimental data.  相似文献   
36.
In April 2001,the Govemment launched the West Kowllon Reclamation Concept Plan Competition to invite conceptral proposals for the development of a prominent 40-hectare waterfront site at the southern tip of the West Kowloon Reclamation into am integrated arts,cultural and entertainment district.The objective of the Competition is ,through the development,to enhance Hong Kong's positions as Asia's premiere centre of arts,culture and entertainment and create a new look for Victoria Harbour.The Competition attracted 161 entries,of which 71 were from Hong Kong and 90 were from elsewhere,covering some 30conntries.Adjudication of the Competition entries was made by a 10-member panel of Jury,chaired by Lord Rothschild.  相似文献   
37.
38.
In a study of how aviation expertise influences age differences in narrative processing, young and older pilots and nonpilots read and recalled aviation and general narratives. They chose referents for sentences referring to a protagonist or minor character mentioned 1 sentence (recent character) or 3 sentences (distant character) before this target sentence. All groups chose referents less accurately for sentences about distant and minor characters than about recent and protagonist characters, perhaps because these referents were less likely to be in working memory. Young readers and pilots were more accurate for distant and minor character target sentences in aviation narratives and recalled aviation narratives more accurately. Expertise did not reduce age differences. Expertise differences may reflect decreased demands on working memory capacity, and age declines may reflect reduced capacity. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
39.
40.
Examined intake profiles of 54 depressed women survivors of child sexual abuse presenting for a specialized group therapy program at a community mental health center. The 32 therapy completers were compared with the 22 dropouts. Both groups possessed extensive and severe childhood and adult abuse histories. Both were extremely socially disadvantaged and clinically impaired as measured on the Millon Clinical Multiaxial Inventory (MCMI). Dropouts were more likely to have been battered as children and to have been sexually abused only within the family. Completers were more likely to have been multiply offended both by intrafamilial and extrafamilial perpetrators. The groups differed in terms of marital status and extent of economic dependence on spouse. Dropouts appeared to be more actively enmeshed in the abuse cycle at the time of therapy. (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