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   16115篇
  免费   618篇
  国内免费   4篇
  2019年   214篇
  2018年   258篇
  2017年   219篇
  2016年   260篇
  2015年   169篇
  2014年   263篇
  2013年   1277篇
  2012年   434篇
  2011年   485篇
  2010年   292篇
  2009年   312篇
  2008年   416篇
  2007年   443篇
  2006年   421篇
  2005年   343篇
  2004年   372篇
  2003年   334篇
  2002年   329篇
  2001年   452篇
  2000年   510篇
  1999年   342篇
  1998年   205篇
  1997年   154篇
  1996年   166篇
  1995年   164篇
  1992年   276篇
  1991年   285篇
  1990年   296篇
  1989年   276篇
  1988年   267篇
  1987年   234篇
  1986年   246篇
  1985年   259篇
  1984年   191篇
  1983年   207篇
  1982年   158篇
  1980年   156篇
  1979年   248篇
  1978年   216篇
  1977年   150篇
  1975年   215篇
  1974年   242篇
  1973年   268篇
  1972年   225篇
  1971年   210篇
  1970年   162篇
  1969年   195篇
  1968年   248篇
  1967年   239篇
  1966年   209篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
241.
In three experiments, 469 subjects watched a short videotape of a bank robbery and later estimated the duration of the tape. Subjects invariably overestimated the durations. Accuracy of time estimation was unrelated to amount of free recall (Experiment 1) or accuracy of memory (Experiment 2). Females overestimated to a greater degree than males (Experiments 2 and 3). A more stressful version of the event produced greater overestimates than a less stressful version (Experiment 3). The relationship between induced arousal and time estimation appears to be different for men and women.  相似文献   
242.
A total of 45 subjects in three age groups (younger, middle-age, older) were trained to word process on microcomputers using a commercial training program and an experimenter-designed test and evaluation protocol. Although all of the subjects mastered the essentials of word processing, the older group took significantly longer to complete the training and evaluation procedures and performed more poorly on a review examination that tested their knowledge of the word-processing commands and techniques. The results are discussed in relation to requirements for trainer assistance, motivational factors, and the need to design training protocols that meet the needs of older adults.  相似文献   
243.
The emergence of counseling in Malaysia illustrates the importance of a strong professional association and counseling training programs at the university level.  相似文献   
244.
245.
A classifier based on the linear regression model was developed to automatically detect sharp transients in EEG, matching the definition of spikes and sharp waves accepted by IFSECN. Practical applications proved the accuracy of the method which succeeded in detecting 84% of sharp transients previously found by an experienced electronencephalographer. Computerized search for sharp transients in EEG records will be particularly useful in long term EEG records obtained from epileptic patients.  相似文献   
246.
The paper investigates 54 myelograms and their influence on diagnostic thinking efficacy, on patient management efficacy, and on ultimate outcome efficacy, using statistical methods. Conventional myelography contributes to diagnostic thinking efficacy having a LLR- value of approximately 0.9. With an accuracy value of 0.95 it can be regarded as a reliable method of diagnosis. It alters diagnostic thinking efficacy in no less than 83% (94%) of the cases and patients management efficacy in 89%. Thus, by definition, myelography may be said to affect the state of health of the myelographed patients in 94.4%.  相似文献   
247.
Four of our own cases that presented a clinical picture of dementia are discussed. A study of the relative literature has failed to reveal any "swing" in the pattern of the clinical condition: Just as it did ninety years age, paralytic dementia accounts today for well over 60% of all cases, those clinical pictures erroneously regarded as "typical" "classic", accounting for a mere 10%-15% of cases. The need for routine lues serology is pointed out.  相似文献   
248.
249.
250.
Flicker contrast sensitivity in normal and specifically disabled readers   总被引:4,自引:0,他引:4  
F Martin  W Lovegrove 《Perception》1987,16(2):215-221
Temporal contrast sensitivity for counterphase flicker was determined for specifically disabled and normal readers to investigate whether the two groups differ in the functioning of their transient systems. In experiment 1, temporal contrast sensitivity was measured over a range of temporal frequencies with a spatial frequency of 2 cycles deg-1. Disabled readers were less sensitive than the control subjects at all temporal frequencies. In experiment 2, temporal contrast sensitivity was measured at a temporal frequency of 20 Hz over a range of spatial frequencies. Disabled readers were less sensitive than the controls at all spatial frequencies, with the differences between the groups increasing as spatial frequency increased. Both these findings are interpreted as supporting the hypothesis of a transient-system deficit in the visual systems of disabled readers.  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