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   22361篇
  免费   441篇
  国内免费   4篇
  22806篇
  2020年   214篇
  2019年   255篇
  2018年   388篇
  2017年   336篇
  2016年   380篇
  2015年   292篇
  2014年   348篇
  2013年   1593篇
  2012年   662篇
  2011年   632篇
  2010年   413篇
  2009年   394篇
  2008年   556篇
  2007年   602篇
  2006年   513篇
  2005年   507篇
  2004年   446篇
  2003年   394篇
  2002年   435篇
  2001年   874篇
  2000年   859篇
  1999年   605篇
  1998年   237篇
  1997年   224篇
  1996年   227篇
  1992年   481篇
  1991年   469篇
  1990年   478篇
  1989年   410篇
  1988年   376篇
  1987年   381篇
  1986年   366篇
  1985年   365篇
  1984年   340篇
  1983年   285篇
  1982年   205篇
  1979年   315篇
  1978年   239篇
  1977年   210篇
  1976年   191篇
  1975年   256篇
  1974年   322篇
  1973年   334篇
  1972年   252篇
  1971年   250篇
  1970年   230篇
  1969年   250篇
  1968年   312篇
  1967年   269篇
  1966年   243篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
151.
One purpose of this investigation was to examine the importance of assessing treatment integrity in a study evaluating a treatment for specific anxiety disorders. Three subjects, two social phobics and one simple phobic, received self-instruction training (Phase I) followed by exposure and self-instruction training (Phase II) in a multiple baseline across subjects design. All subjects were assessed during a pretreatment baseline and throughout treatment using measures of treatment integrity and measures of change in phobic severity. Improvement took place at different times for different subjects. Measures of treatment integrity, which consisted of monitoring of self-statements as well as practice outside the session, indicated that treatment was not always received as intended and that improvement was correlated with practice. The usefulness of measures of treatment integrity in both clinical and research settings is highlighted.  相似文献   
152.
Considerable confusion exists in the burnout literature about the similarities and separateness among the constructs of burnout, depression and job satisfaction. This study examined the construct validity of burnout using Campbell & Fiske's multitrait-multimethod approach. The constructs of burnout, depression and orderliness (chosen as a discriminant construct) were assessed by three types of self-report instruments. Data were analysed for 181 females and 139 male faculty members who spent at least 50 per cent of their time in teaching. Results indicated that measures of burnout largely met Campbell & Fiske's criteria for construct validity: burnout measures possessed adequate to good internal reliability and convergent validity. However, burnout measures also correlated substantially with measures of depression. Results are discussed in terms of possible explanations for the substantial overlap that has been demonstrated among measures of burnout, depression and job satisfaction.  相似文献   
153.
The influence of contextual stimuli on the conditioning and performance of responding to a discrete stimulus was examined in the US preexposure paradigm using both context shift manipulations and a measure of context conditioning. Four groups of rats received both repeated exposure to an electric shock US in one context (Context 1), and repeated nonshocked exposure to a second context (Context 2). Two additional groups of rats received exposure to these contexts, but never received shock presentations. Rats exposed to shock learned to escape from the stimuli of Context 1, but did not escape from the stimuli provided by Context 2. Rats not exposed to shock failed to escape from either context. All rats then received a single CER conditioning session in which four pairings of a 3-min noise CS and shock US were presented. Half the rats received those CS-US pairings in the excitatory Context 1, while the remaining rats received those pairings in the neutral Context 2. Finally, half the rats in each of the CER conditioning treatments received extinction test trials of the noise CS in Context 1, while the remaining rats received those test trials in Context 2. Thus, this design factorially manipulated the presence of excitatory or neutral contextual stimuli during both conditioning and testing of a discrete CS. In comparison with the two groups of rats never preexposed to shock alone, attenuation in acquisition of conditioned suppression observed during test trials occurred only when CER conditioning had been administered in the excitatory Context 1, and this effect was manifested when testing occurred in either the excitatory Context 1 or the neutral Context 2. These results support the model of R. A. Rescorla and A. R. Wagner (1972) (in A. H. Black & W. F. Prokasy (Eds.) Classical Conditioning II, pp. 64–99, New York: Appleton-Century-Crofts) which asserts that contextual stimuli and sicrete CSs compete for limited associative strength supportable by a given US.  相似文献   
154.
A double-blind experiment with 58 adults tested the hypothesis that proximity to sugar reduces human grip strength. An analysis of variance supported the hypothesis.  相似文献   
155.
156.
By 48 patients with Wilson's disease the brainstem acoustic evoked potentials were stated. There were 35 pathological findings (73%), 13 were normal (27%). The waves, determined by the middle and upper brainstem (Pons and Mesencephalon) showed most of all pathological changes. Those patients with forms of Wilson's disease called Pseudoskelerose and Pseudoparkinson showed the most pathological findings. But one could watch these findings by about 30% of patients in preclinical stage. This method can possibly be used for early detection of disorders of brainstem functions and in the same way it can be used for control of treatment by patients in preclinical stage.  相似文献   
157.
Animal Cognition - Self-handicapping behaviors evolved as honest signals that reliably reflect the quality of their performers. In playful activities, self-handicapping is described as...  相似文献   
158.
The hypothesis that attitudinal effects of participation depend on individual differences in motivation was tested in a laboratory experiment with 56 three-man groups (leader and two members). Measures of the attractiveness of power and social acceptance were obtained prior to a group decision task, after which members described their perceived participation, influence, and satisfaction. Results showed that: (a) influence was more strongly related to satisfaction for members with strong, as opposed to weak, power motives; (b) for members with strong affiliation motives, participation was more strongly related to satisfaction than was influence. Relationships varied across satisfaction aspects. It was concluded that participation may be associated with favorable role attitudes through different motive-attainment mechanisms in the group decision-making process.  相似文献   
159.
160.
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