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   63833篇
  免费   2637篇
  国内免费   41篇
  66511篇
  2020年   683篇
  2019年   864篇
  2018年   1222篇
  2017年   1236篇
  2016年   1283篇
  2015年   920篇
  2014年   1077篇
  2013年   4947篇
  2012年   2076篇
  2011年   2256篇
  2010年   1400篇
  2009年   1311篇
  2008年   1969篇
  2007年   1922篇
  2006年   1748篇
  2005年   1551篇
  2004年   1374篇
  2003年   1294篇
  2002年   1401篇
  2001年   2008篇
  2000年   1995篇
  1999年   1496篇
  1998年   706篇
  1997年   620篇
  1996年   625篇
  1993年   563篇
  1992年   1260篇
  1991年   1150篇
  1990年   1143篇
  1989年   1040篇
  1988年   1031篇
  1987年   974篇
  1986年   1047篇
  1985年   1055篇
  1984年   888篇
  1983年   807篇
  1982年   566篇
  1981年   561篇
  1979年   944篇
  1978年   674篇
  1975年   765篇
  1974年   822篇
  1973年   915篇
  1972年   772篇
  1971年   731篇
  1970年   651篇
  1969年   676篇
  1968年   864篇
  1967年   782篇
  1966年   658篇
排序方式: 共有10000条查询结果,搜索用时 7 毫秒
151.
Tobacco, alcohol, and drug use are problems for American-Indian people. We reviewed these problems and the explanations for them and described a bicultural competence skills approach for preventing substance abuse with American-Indian adolescents. Data from a study of that approach suggest its efficacy with American-Indian youth. At posttest and a 6-month follow-up, American-Indian subjects who received preventive intervention based on bicultural competence skills concepts improved more than did American-Indian subjects in a no-intervention control condition on measures of substance-use knowledge, attitudes, and interactive skills, and on self-reported rates of tobacco, alcohol, and drug use. Our findings have implications for future substance-abuse prevention research with American-Indian people.  相似文献   
152.
153.
In this study the authors compared women's and men's reactions to various professional travel situations. A multivariate analysis of covariance was used to determine the effects of sex, professional role, and years traveling on the perceptions of these travel situations.  相似文献   
154.
In this article, the author identifies resources available to assist the gay and lesbian population with career planning and job search concerns. Evolving legal issues are also discussed.  相似文献   
155.
In this article the author lists and discusses sources of test information, with special attention on information given to what will be valuable to employment and career counselors.  相似文献   
156.
The present study demonstrates the safety and effectiveness of an outpatient program designed to respond to adolescent-precipitated crises by mobilizing and restructuring the family's kinship system. Families of 75 adolescents at risk for hospitalization were followed up to 24 months after treatment with Systemic Crisis Intervention. Measures of offspring and family functioning, suicidal behavior, institutional use, and treatment costs are presented. Results clearly demonstrate the safety, effectiveness, and economic viability of Systemic Crisis Intervention.  相似文献   
157.
Interview skills deficits may limit employment prospects of mentally retarded adults. Although numerous papers highlight the importance of interview skills, few have validated effective strategies for use with mentally retarded persons. Further, there has been a lack of research contrasting rival interview skills training strategies. The present study was conducted with two mentally retarded young adults. It contrasted peer-directed instruction, in which both participants were equally deficient in the target skills, with teacher-directed instruction. Results of the investigation indicated that instruction, rehearsal, and feedback may be effective strategies regardless of who provides instruction. Comparisons of teacher-directed and peer-directed instruction indicated little or no difference in the effectiveness of the two procedures. However, the peer-directed procedure involved considerably less staff time than did the teacher-directed procedure.  相似文献   
158.
159.
160.
Research in both laboratory and field settings has suggested a link between thermal stress and violent behavior, and both linear and curvilinear models have been investigated. A dearth of field studies prompted the analysis reported here, which is based on data for some 10,000 aggravated assaults occurring the City of Dallas in 1980 (a summer of severe heat stress) and 1981. This analysis replicates and extends certain aspects of recent work by Anderson and Anderson (1984) relating to the so-called linear and curvilinear hypotheses. Thermal stress is measured in two ways: a Discomfort Index (DI), which takes into account the influence of humidity acting in concert with temperature, and ambient temperature. Regression analyses were performed in two stages. In the first, data for all neighborhoods and all days of the study period were combined into ambient temperature and DI models. At the second stage, models differentiated between the three levels of neighborhood socioeconomic status. With weekend controlled, DI and ambient temperature were significant independent variables in the ‘overall’ model and in medium and low status neighborhoods. However, when linear effects were controlled, the curvilinear measures were never significant. The analysis generally tended to confirm Anderson and Anderson's suggestion that a reduction of aggression with increasing temperature does not appear to occur within the normal range of temperatures. This analysis further suggested that the hypothesized curvilinear effect is weak, if not entirely absent, even during conditions of extreme heat.  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