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   94464篇
  免费   2983篇
  国内免费   25篇
  97472篇
  2020年   721篇
  2019年   905篇
  2018年   4321篇
  2017年   3717篇
  2016年   3343篇
  2015年   1140篇
  2014年   1229篇
  2013年   5705篇
  2012年   2694篇
  2011年   4506篇
  2010年   3717篇
  2009年   2781篇
  2008年   3579篇
  2007年   4008篇
  2006年   1948篇
  2005年   1907篇
  2004年   1760篇
  2003年   1606篇
  2002年   1709篇
  2001年   2487篇
  2000年   2487篇
  1999年   1858篇
  1998年   903篇
  1997年   795篇
  1996年   769篇
  1992年   1559篇
  1991年   1438篇
  1990年   1461篇
  1989年   1343篇
  1988年   1318篇
  1987年   1256篇
  1986年   1342篇
  1985年   1364篇
  1984年   1135篇
  1983年   1039篇
  1982年   748篇
  1981年   734篇
  1979年   1214篇
  1978年   876篇
  1977年   731篇
  1975年   1054篇
  1974年   1108篇
  1973年   1169篇
  1972年   1008篇
  1971年   933篇
  1970年   848篇
  1969年   925篇
  1968年   1116篇
  1967年   1011篇
  1966年   909篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
921.
The purposes of this study were (1) to replicate a right visual-field advantage for a version of the Embedded Figures Test modified for tachistoscopic presentation and (2) to test for a relationship between field independence and performance on modified Embedded Figures Test items presented to the right visual-field. 34 right-handed subjects were presented Embedded Figures Test items to the left, center, and right visual-fields for 150 msec. The Group Embedded Figures Test was also given. Results showed a right visual-field advantage on the modified embedded-figures test and (2) a negative relationship between Group Embedded Figures Test performance and right visual-field scores. These findings were discussed in terms of the differences between the two versions of the embedded-figures test, memory for simple figures, specificity of judgment, and sustained versus tachistoscopic perception. A tentative conclusion suggests that a better internal representation of the briefly presented complex figures places field-independent subjects at a disadvantage on the modified version of the test.  相似文献   
922.
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   
923.
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   
924.
40 women were taught to use self-statements to cope with pain caused by ice water. The trainer used four different strategies for reassigning a homework task of using self-statements to cope with pain produced by immersing one hand in ice water. The strategies were equally effective in eliciting compliance with the homework assignment.  相似文献   
925.
On the basis of the hypothesis of misapplied constancy scaling, the perception of an abstract horizontal-vertical illusion figure embedded in photographs of natural scenes with depth cues is investigated. The effect is compared with that of a figure on photographs containing no depth information and with a figure on a neutral surface. It is shown that the magnitude of the illusion in the perspective scenes is greater than in the other two conditions. The results are considered compatible with a constancy theory of the illusion. Finally, the evidence for misapplied constancy scaling in the horizontal-vertical illusion in relation to a retinal theory is discussed.  相似文献   
926.
Improvement in auditory-successive selective attention was noted across the age range of 9 through 16 yr. In contrast to comparable paradigms with visual-simultaneous materials, 30 learning disabled and 30 normal boys did not differ. Results of research on selective attention may be affected by task materials and encoding requirements.  相似文献   
927.
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   
928.
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   
929.
930.
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