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   80325篇
  免费   1306篇
  国内免费   4篇
  81635篇
  2020年   587篇
  2019年   791篇
  2018年   4186篇
  2017年   3554篇
  2016年   3173篇
  2015年   1008篇
  2014年   1040篇
  2013年   4527篇
  2012年   2313篇
  2011年   4090篇
  2010年   3517篇
  2009年   2549篇
  2008年   3238篇
  2007年   3674篇
  2006年   1612篇
  2005年   1586篇
  2004年   1449篇
  2003年   1328篇
  2002年   1376篇
  2001年   2012篇
  2000年   2018篇
  1999年   1502篇
  1998年   730篇
  1997年   640篇
  1996年   632篇
  1993年   559篇
  1992年   1252篇
  1991年   1152篇
  1990年   1137篇
  1989年   1033篇
  1988年   1020篇
  1987年   975篇
  1986年   1045篇
  1985年   1056篇
  1984年   886篇
  1983年   810篇
  1982年   569篇
  1981年   568篇
  1979年   946篇
  1978年   675篇
  1975年   774篇
  1974年   820篇
  1973年   920篇
  1972年   773篇
  1971年   730篇
  1970年   652篇
  1969年   670篇
  1968年   859篇
  1967年   782篇
  1966年   656篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
251.
Flicker fusion frequencies of 48 healthy controls and of 35 alcoholics were measured to detect possible associations between flicker fusion and signs of nonspecific brain damage, the aim of the study. FFF was statistically significantly lower in patients addicted to alcohol than in healthy subjects. Lower flicker fusion frequencies were associated with the severeness of organic psychosis as rated psychopathologically. The hypothesis that addiction to alcohol is a sign of diffuse, nonspecific, organic brain damage was discussed.  相似文献   
252.
The Safety Locus of Control Scale was designed to predict employees' accidents and injuries. Internal scorers think they should assume personal responsibility for their safety, and they believe they can take preventive steps to avoid accidents. External scorers assume little personal responsibility for prevention of accidents. Instead, they place more blame on factors outside their control, such as luck or chance. This study showed that the safety scale was effective in differentiating between groups with varying accident histories, which supports the criterion-related validity of the scale.  相似文献   
253.
Subjects in a prior study of complex learning often experienced difficulty in mastering the task because of an apparent reluctance to release one perceptual field and reconstrue the task on a higher cognitive level. It was hypothesized that were this the correct explanation, the faster learners would be more field independent on a measure of field dependence, since independence has been defined in terms of ease in releasing one's attention from the immediate perceptual field. This hypothesis was tested with 22 undergraduate subjects for whom Group Embedded Figures Test scores were correlated with the number of trials to completion on the complex learning task. A moderate but significant correlation supported the hypothesis.  相似文献   
254.
A property of attitudes, namely, the fact that attitudes select facts, is used to comment upon a paper on handedness and career choice.  相似文献   
255.
256.
The authors present a short review of the pertinent literature and report on their own neuropsychiatric findings following internal craniocerebral injuries, at the same time drawing attention to the necessity of psychological examination. Statistical comparisons with the international literature are complicated owing to the different classifications used for craniocerebral injuries.  相似文献   
257.
Hyperlexia and a variant of hypergraphia   总被引:1,自引:0,他引:1  
A patient with hyperlexia and hypergraphia is described. The unusual co-occurrence of these two abilities is discussed. Hyperlexia may provide a useful marker to guide educational programming.  相似文献   
258.
This project studied the effects of weather variables and size of the population on minor and major violence rates within six prisons in the Kingston, Ontario, Canada area from January, 1980 through December, 1983. While weather variables have been studied in relation to mood changes within the general population, this study was the first to analyze the impact of weather variables on rates of violence within the prison setting using forward inclusion multiple regression. Analysis showed that population size consistently appeared positively correlated with assaults on other inmates among the male medium-security prisoners during the summer months. In the summer months, temperature tended to be positively related to some minor kinds of offenses, but in the winter months the relationship was negative. Humidity, rain, sunshine hours, snow, and snow on the ground were not consistently related to incidences of minor and major violence. Indices of geomagnetic disturbances had statistically significant inverse relationships with attempted suicide/self-inflicted injury rates among the male prisoners during the summer months. Over 12 months, wind was generally negatively correlated with incidences of major and minor violence among the male inmates. For 6-mo. periods, wind was generally positively correlated with violence rates during the winter months and negatively correlated during the summer months among the male inmates. The findings relating weather variables to violence rates in the women's prison were consistently in opposition to those found for male prisoners during the 4-yr. period.  相似文献   
259.
A paradoxical instruction was used to treat a 10-yr.-old boy's complaint of crying when unable to sleep and the daytime equivalent of fearing the public display of crying when failing at sports performances. The instruction resolved both the sleep disturbance and the public crying. The results suggest that, like adults, children may experience anxiety about sleep difficulties and that paradoxical intention may have promise for the treatment of some children's insomnia.  相似文献   
260.
The relationship between cognitive style and illusion magnitude was examined using the assimilation and contrast Delboeuf distortions. As in previous research, field dependence correlated positively with assimilation; however, a significant negative correlation with contrast was also found, suggesting that, while field dependence may involve the illusory integration of the stimulus field, field independence may involve its equally illusory differentiation.  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