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   80475篇
  免费   3306篇
  国内免费   37篇
  2020年   901篇
  2019年   1102篇
  2018年   1563篇
  2017年   1634篇
  2016年   1651篇
  2015年   1202篇
  2014年   1411篇
  2013年   6800篇
  2012年   2599篇
  2011年   2692篇
  2010年   1667篇
  2009年   1679篇
  2008年   2368篇
  2007年   2274篇
  2006年   2106篇
  2005年   1774篇
  2004年   1754篇
  2003年   1726篇
  2002年   1619篇
  2001年   2734篇
  2000年   2608篇
  1999年   1930篇
  1998年   919篇
  1997年   769篇
  1996年   841篇
  1995年   761篇
  1994年   763篇
  1993年   744篇
  1992年   1616篇
  1991年   1507篇
  1990年   1482篇
  1989年   1400篇
  1988年   1375篇
  1987年   1298篇
  1986年   1262篇
  1985年   1361篇
  1984年   1094篇
  1983年   918篇
  1979年   1118篇
  1978年   838篇
  1977年   731篇
  1975年   936篇
  1974年   1026篇
  1973年   1096篇
  1972年   910篇
  1971年   817篇
  1969年   739篇
  1968年   929篇
  1967年   798篇
  1966年   831篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
791.
A diverse set of findings from recent research suggests the value of visual imagery techniques in clinical practice.  相似文献   
792.
Two research questions pertaining to the applicant age bias effect were addressed in this study: the effect of age-related information exposure on selection decisions and the issue of between-sample generalizability with reference to the age bias effect. Manager and student selectors made selection decisions after viewing one videotape of a simulated selection interview of either an old or a young job applicant. Before viewing the interview tape, half of each subject group was given an item of age-related information and the other half was given neutral information. The results showed that, under the neutral information condition, managers preferred hiring the young applicant for the low-status job, and students favored the old candidate for the high-status position. Under the age-related information condition, managers shifted to favoring the old candidate for the low-status job, and students preferred the young applicant for both the low- and high-status positions. Age discrimination in selection decisions and the lack of external validity of student results in selection research are then discussed.  相似文献   
793.
794.
S Becker  U Clement 《Psyche》1989,43(8):698-709
The authors warn against a trivialization of the AIDS problem and against the call for state control. Since sexuality is ultimately uncontrollable, they plead instead for the greater clarification of the conflicts which those who are infected with HIV and those who are not infected experience in dealing with each other. The continuing mystification of these conflicts would result in mutual jeopardy through acting-out.  相似文献   
795.
To assess temporal variations in the perception of "phasic" heat pain stimuli a psychophysical tracking procedure was developed that enables repeated assessment of the pain threshold at short intervals. This "double-tracking" procedure produces two tracking curves simultaneously, one that approaches the pain threshold gradually from above, the other from below. The threshold for phasic heat pain was measured in 80 tracking trials with stimuli at temperatures near the pain threshold. Concurrently, the threshold for "tonic" heat pain was determined after every 20 tracking trials with a stimulus adjustment procedure. Eleven healthy subjects (age: 26.4 yr. +/- 6.0) participated in 2 sessions each. Phasic stimulation near the pain threshold did not produce any trends in either of the two threshold measures. Hence there was no long-term adaptation or sensitization. However, there were random variations (random walks) in the tracking curves, which we interpret as resulting from a stochastic relationship between stimulus and sensation. In agreement with other reports, discrimination seemed to be better at painful than at nonpainful temperatures.  相似文献   
796.
The purpose of this study was to examine the effect of massed and distributed practice upon the learning by 8 autistic children of rotary pursuit tracking at 20 rpm. The massed practice group of four completed 10 30-sec. trials with 5-sec. rests for 10 consecutive days on the Photoelectric Pursuit Rotor. The distributed practice group completed 10 30-sec. trials with 30-sec. rests for 10 consecutive days on the same device. The results of a 2 x 10 x 10 (group x practice days x trials) analysis of variance with repeated measures on the last two factors indicated that learning occurred for both groups but no differences between groups were significant. It is suggested that further investigations into the applicability of motor learning principles to special populations be conducted using larger groups.  相似文献   
797.
To examine the acquisition of voluntary control of a novel muscular activity from the initial stage to the self-control stage, the m. auricularis posterior, which had generally degenerated and had nearly lost its function of drawing an auricle backward in the human body, was selected as a target muscle to be studied. One female undergraduate student who could not move her auricles intentionally was required to activate her left m. auricularis posterior and underwent rest, pretest, training, and posttest sessions once a day for five days. At the subject's request, the electromyograph (EMG) from her left m. auricularis posterior on an oscillograph was provided for her as the feedback signal on each training trial. The picture of her left ear on television was handled in the same way. The EMG measures indicated that the subject could learn to activate her left m. auricularis posterior differentially. The number of training trials on which the subject requested the feedback signals suggested that EMG feedback signal was more useful to her than the video and that the usefulness of the feedback signals varied as the training sessions advanced. It was also concluded from analysis of the self-report data that the acquisition process of self-control of a novel muscular activity could be divided into at least four stages.  相似文献   
798.
Dynamic attending and responses to time   总被引:6,自引:0,他引:6  
  相似文献   
799.
The work on this paper was done in the research project V ra begrepp om spr k supported byHumanistisk-samhälls-vetenskapliga forskningsr det. I am indebted to Per Martin-Löf, Hans Ruin, Pär Segerdahl, and Sven Öhman for valuable comments on a previous version of this paper. Thanks to the comments of the anonymous referee I was able to improve some formulations in the paper.  相似文献   
800.
One interpretation of the doctrine of double effect (DDE) holds that in situations in which good can be secured for some only if others suffer harm, the pursuit of a good tends to be less acceptable when a resulting harm is intended as a means rather than when it is merely foreseen. The doctrine captures certain moral intuitions about pairs of cases which have the same consequential profiles but in which the character of the intention differs. Quinn examines the DDE using three pairs of contrasting cases, two of which are medical examples: the "Direction of Resources" case and the "Guinea Pig" case, both involving allocation of life-saving resources, and the "Craniotomy" case and the "Hysterectomy" case, both involving fetal vs. maternal life. He concludes that the DDE "embodies our sense that certain forms of forced strategic subordination are especially inappropriate among free and equal agents."  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