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   100350篇
  免费   4029篇
  国内免费   45篇
  2020年   1084篇
  2019年   1293篇
  2018年   1872篇
  2017年   1950篇
  2016年   1998篇
  2015年   1442篇
  2014年   1735篇
  2013年   8318篇
  2012年   3146篇
  2011年   3242篇
  2010年   2062篇
  2009年   2036篇
  2008年   2890篇
  2007年   2783篇
  2006年   2567篇
  2005年   2196篇
  2004年   2141篇
  2003年   2108篇
  2002年   2047篇
  2001年   3168篇
  2000年   3007篇
  1999年   2281篇
  1998年   1138篇
  1997年   990篇
  1996年   1030篇
  1995年   949篇
  1992年   1918篇
  1991年   1807篇
  1990年   1778篇
  1989年   1679篇
  1988年   1648篇
  1987年   1583篇
  1986年   1578篇
  1985年   1660篇
  1984年   1370篇
  1983年   1174篇
  1979年   1427篇
  1978年   1095篇
  1977年   957篇
  1976年   936篇
  1975年   1202篇
  1974年   1362篇
  1973年   1463篇
  1972年   1176篇
  1971年   1096篇
  1970年   1002篇
  1969年   1024篇
  1968年   1270篇
  1967年   1121篇
  1966年   1153篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
921.
922.
This article provides a comprehensive review of the research on smoking and body weight. The relationships between smoking and body weight are evaluated in 70 cross-sectional and longitudinal investigations. The mechanisms responsible for differences in body weight are discussed, the weight-related issues that promote smoking behavior are reviewed, methods for reducing postcessation weight gain are summarized, and future research directions are proposed. A proposed working research model for studying the relationship between smoking, energy balance, and weight gain is offered. It is concluded that smoking and body weight relationships are closely related and pose significant challenges for smoking researchers.  相似文献   
923.
Previous studies have shown that females tell stories that change from negative experiences (deprivation) to positive experiences (enhancement) and males tell stories that change in the opposite direction. The current study examines this phenomenon in children using a different story-telling procedure. Results were not consistent with those of previous studies.  相似文献   
924.
A nationwide sample of 2710 Dutch adolescents and 518 ethnic minority adolescents living in the Netherlands was used to examine ethnic and sex differences in happiness. Analyses of variance were conducted with ethnic background, sex, and length of residence in the Netherlands, as variables. Socioeconomic status was included in the analyses as a covariate. Adolescents from ethnic minority backgrounds, as compared to the Dutch, had significantly lower scores on a generalized estimates of life satisfaction and on a measure of hedonic effect. Both differences, however, explained only a very small amount of variance. Girls (from all ethnic groups including the Dutch) had lower scores than boys on both measures. There was no significant effect for length of residence on either measure.  相似文献   
925.
123 high school students completed the short form of the Coopersmith Self-esteem Inventory-School Form and its Lie scale, Beck's Depression Inventory, and an Alcohol Dependency Scale. Analyses of variance (2 x 4) showed boys had higher mean Lie scores than girls, and freshmen had lower mean alcohol dependency scores than sophomores, juniors, and seniors. Correlations between self-esteem scores and depression scores were significant and negative, but values were significant and positive between self-esteem and lie scores and between depression and alcohol dependency scores. Much work is required to understand better the relations among depression, self-esteem, and drug and alcohol dependency in high school students if interventions are to focus upon prevention.  相似文献   
926.
Trace mineral analysis of human hair was utilized to determine whether violent and nonviolent criminals could be differentiated on the basis of concentrations of levels of major and trace minerals. 40 violent and 40 nonviolent inmates from a prison population were selected for study. 27 mineral levels were analyzed and a discriminant function analysis correctly classified 86% of the violent and 78% of the nonviolent inmates. The results lent support to the hypothesis that significantly different levels of trace minerals could be found between the two groups.  相似文献   
927.
12 subjects from an experiment on relaxation therapy for asthma were given the Harvard Group Scale of Hypnotic Susceptibility, Form A. Full scale hypnotic susceptibility scores were positively correlated, at a borderline significance, with improvement in the methacholine challenge test, a measure of asthma severity. Performance on the amnesia item of the Harvard Group Scale was correlated with improvement in self-reported symptoms of asthma.  相似文献   
928.
To study the self-projective representations expressed by diabetic children, aged between 10 and 15 yr., and to compare these with representations of a control group the Draw-a-person test associated with those for subsequent Draw-a-sick-person were administered to 23 children regularly checked by an Antidiabetic Centre. The diabetic subjects drew an image of "sick person" having projective elements with a regressive value and denoting a refuge in the past, together with depressive signs of retiring into themselves and of less consideration of the self. Also, the diabetic children seemed to be less prone to the cultural stereotype which requires a smiling and happy image of "the healthy person." At the same time there was also a transparent symbolic defense which allowed the diabetics to adapt variously and to move from their anxious state toward psychological recovery.  相似文献   
929.
Georg Ilberg, who is almost forgotten nowadays, was a scholar of Kraepelin and Ganser. From 1910 to 1928 he was director of the Landes-Heil- und Pflegeanstalt (country mental hospital) for mental patients Sonnenstein at Pirna. He was active in the scientific-literary field to a great age and worked as editor of the Allgemeine Zeitschrift für Psychiatrie from 1924 to 1934. Although he principally advocated the exclusion of certain mental patients from reproduction at the beginning of the 1930s, in a review in 1942, his integer humanist basic position and his pronounced social feeling made him to protest in public against the putting to death of mental in-patients.  相似文献   
930.
Cognition and olfaction: a review   总被引:5,自引:0,他引:5  
Examines research in cognitive psychology, which has in the past paid little attention to the olfactory modality. But there is now a significant body of literature on the role of the olfactory system in memory and cognition. Human beings possess an excellent ability to detect and discriminate odors, but they typically have great difficulty in identifying particular odorants. This results partly from the use of an improverished and idiosyncratic language to describe olfactory experiences, which are normally encoded either in a rudimentary sensory form or as part of a complex but highly specific biographical episode. Consequently, linguistic processes play only a very limited role in olfactory processing, whereas hedonic factors seem to be of considerable importance.  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