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   73250篇
  免费   3032篇
  国内免费   31篇
  2020年   824篇
  2019年   987篇
  2018年   1421篇
  2017年   1468篇
  2016年   1535篇
  2015年   1110篇
  2014年   1308篇
  2013年   6270篇
  2012年   2407篇
  2011年   2426篇
  2010年   1463篇
  2009年   1478篇
  2008年   2077篇
  2007年   2088篇
  2006年   1871篇
  2005年   1590篇
  2004年   1629篇
  2003年   1553篇
  2002年   1508篇
  2001年   2445篇
  2000年   2289篇
  1999年   1715篇
  1998年   792篇
  1997年   694篇
  1996年   784篇
  1995年   701篇
  1994年   682篇
  1993年   670篇
  1992年   1429篇
  1991年   1336篇
  1990年   1332篇
  1989年   1263篇
  1988年   1247篇
  1987年   1148篇
  1986年   1171篇
  1985年   1198篇
  1984年   989篇
  1983年   850篇
  1979年   1041篇
  1978年   776篇
  1975年   841篇
  1974年   990篇
  1973年   1012篇
  1972年   849篇
  1971年   795篇
  1970年   731篇
  1969年   690篇
  1968年   900篇
  1967年   794篇
  1966年   737篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
Using a psychological test battery for registration of psychic/psychomotoric speed and flexibility/perseveration we examined 78 epileptic patients with different forms of epilepsy and the same number of brain healthy control persons, parallelised in sex, age, education, profession and intelligence. The registrated data were varianz-, correlation- and factoranalised. We found a deceleration of psychic/psychomotoric speed as a primary basic disorder in epileptics. Decreases of flexibility independent of speed were not ascertainable.  相似文献   
994.
995.
996.
Rats were given backward pairings of a tone (CS) and shock (US) and were then tested for response to the CS in a lick suppression test. Animals given a cuing or reminder treatment prior to the test exhibited enhanced suppression in the presence of the tone relative to a variety of control conditions. The cue-induced suppression enhancement did not appear to result from sensitization or short-term motivational changes nor did it seem to depend on second-order conditioning of the test context. The effect appeared more robust as the number of backward conditioning trials preceding the cue increased. The results were discussed in terms of current explanations of backward conditioning effects.  相似文献   
997.
Distributions of reinforcers between two components of multiple variable-interval schedules were varied over a number of conditions. Sensitivity to reinforcement, measured by the exponent of the power function relating ratios of responses in the two components to ratios of reinforcers obtained in the components, did not differ between conditions with 15-s or 60-s component durations. The failure to demonstrate the “short-component effect,” where sensitivity is high for short components, was consistent with reanalysis of previous data. With 60-s components, sensitivity to reinforcement decreased systematically with time since component alternation, and was higher in the first 15-s subinterval of the 60-s component than for the component whose total duration was 15 s. Varying component duration and sampling behavior at different times since component transition may not be equivalent ways of examining the effects of average temporal distance between components.  相似文献   
998.
Two experiments examined pigeons' response rates during short trials signaled by stimuli closely spaced along a wavelength continuum. In Experiment 1 separate halves of the continuum were correlated with different reinforcement schedules. In Experiment 2, the middle stimulus was accompanied by a lower probability of reinforcement than were the remaining wavelengths. Both procedures resulted in dimensional contrast “shoulders,” seen as relatively enhanced or depressed response rates in the presence of stimuli between the extreme of the continuum and the border separating the positive and negative stimuli. Sequential analyses addressed possible contributions of the following interactions: (a) local contrast, seen when rate during a given schedule depends on the schedule in the just-preceding trial; (b) modification of local contrast by the similarity of the signaling stimuli (P. Blough, 1983); and (c) schedule-independent rate contrast, seen when rate in a given trial depends on the rate controlled by the stimulus that accompanied the just-preceding trial (Malone & Rowe, 1981). Dimensional contrast functions were similar when isolated according to the schedule, to the similarity of the signaling stimulus, and to the response rate of the just-preceding trial. The interactions noted above do not appear to make important contributions to this effect.  相似文献   
999.
A contextual approach to narcissism is developed in which theology is seen to articulate simultaneously with psychological needs and cultural values. Some implications of the psychology of the self for theology and culture are discussed in this framework.The author wishes to express his gratitude to Dr. Larry K. Graham for his comments on an earlier version of this paper.Dr. Fallot is a psychologist on the staff of the Student Counseling Service, University of Illinois at Chicago, P.O. Box 4348, Chicago, Il. 60680.  相似文献   
1000.
This essay presents the findings from a study of the effect of divorce on spiritual growth among Protestants. Looking at movement in the areas of love of God, self, and others, it shows that the divorce experience can have varying levels of impact which relate at least partially to the traumatic intensity of the experience itself.Excerpted from The Effect of Divorce on Spiritual Growth: A Study in Protestant Spirituality (unpublished thesis), (c) 1984 Jean M. Blomquist. 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