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   75898篇
  免费   2832篇
  国内免费   38篇
  78768篇
  2020年   744篇
  2019年   905篇
  2018年   1429篇
  2017年   1426篇
  2016年   1551篇
  2015年   1042篇
  2014年   1203篇
  2013年   6012篇
  2012年   2347篇
  2011年   2512篇
  2010年   1414篇
  2009年   1413篇
  2008年   2153篇
  2007年   2076篇
  2006年   1899篇
  2005年   2789篇
  2004年   2171篇
  2003年   1888篇
  2002年   1677篇
  2001年   2237篇
  2000年   2125篇
  1999年   1667篇
  1998年   877篇
  1997年   789篇
  1996年   741篇
  1995年   735篇
  1993年   684篇
  1992年   1400篇
  1991年   1334篇
  1990年   1318篇
  1989年   1184篇
  1988年   1172篇
  1987年   1137篇
  1986年   1190篇
  1985年   1226篇
  1984年   992篇
  1983年   861篇
  1979年   1012篇
  1978年   771篇
  1976年   700篇
  1975年   903篇
  1974年   1013篇
  1973年   1003篇
  1972年   861篇
  1971年   805篇
  1970年   736篇
  1969年   766篇
  1968年   929篇
  1967年   876篇
  1966年   832篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
931.
Twenty elderly subjects (70-90 years old) and 20 young control subjects (18-24 years old) underwent three kinds of olfactory testing: absolute thresholds to three odorants (d-limonene, iso-amyl butyrate, benzaldehyde), magnitude matching of these odorants to salt tastes, and odor identification of 30 common substances. For all three odorants elderly subjects' mean threshold significantly exceeded that of the young by about ninefold for d-limonene, about threefold for benzaldehyde, and about twofold for iso-amyl butyrate. These threshold differences predict approximate concentration differences necessary to arouse the same estimated odor strength above the threshold for the elderly and the young. Young subjects also scored better than the elderly in odor identification, even when subjects were given four alternatives from which to select the correct label. Unimpaired olfactory functioning is uncommon in the elderly; correlational tests show that as a group the young have better olfactory ability and show more interindividual uniformity.  相似文献   
932.
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   
933.
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   
934.
Elderly subjects were 41% less accurate than young subjects in localizing a point in the frontal plane. The decline could be ascribed neither to an age difference in image formation or skill acquisition nor to a difference in motivational level or trace retention. Evidently the "ambient" or "transient" visual system is compromised at an elementary level. Reasons why this deficit may not be compounded at more complex levels of spatial processing are suggested.  相似文献   
935.
I hypothesized that feelings of strain experienced by an adult daughter are likely to interfere with the nature of her relationship with her aging mother and to have a potentially deleterious effect on the mother. To test this proposition, I devised a study that examined the impact of two brief interventions on 37 middle-aged women and 24 of their elderly mothers: (a) a cognitive-behavioral presentation designed to reduce the daughter's unrealistic feelings of responsibility and (b) a supportive-educational presentation designed to increase the daughter's awareness of her mother's needs. I found that the first procedure was more effective than the second in reducing the daughter's burden, improving the mother-daughter relationship, and decreasing the loneliness experienced by the elderly mother.  相似文献   
936.
937.
The authors describe a career counseling strategy based on specific psychosocial characteristics of battered women. The approach is developmental in nature, focusing on the client's self-concept. A group format based on a pilot intervention is proposed to assist battered women in developing appropriate life and career decision-making skills.  相似文献   
938.
939.
The authors demonstrate the complexities and processes involved in constructing a screening test for posttraumatic stress disorder (PTSD). Discussion includes item development, field testing, and preliminary results.  相似文献   
940.
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