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   933篇
  免费   37篇
各国政治   35篇
工人农民   81篇
世界政治   55篇
外交国际关系   50篇
法律   465篇
中国政治   10篇
政治理论   257篇
综合类   17篇
  2022年   3篇
  2021年   8篇
  2020年   15篇
  2019年   14篇
  2018年   28篇
  2017年   38篇
  2016年   36篇
  2015年   23篇
  2014年   37篇
  2013年   143篇
  2012年   26篇
  2011年   35篇
  2010年   20篇
  2009年   15篇
  2008年   38篇
  2007年   40篇
  2006年   37篇
  2005年   24篇
  2004年   34篇
  2003年   34篇
  2002年   25篇
  2001年   14篇
  2000年   21篇
  1999年   15篇
  1998年   11篇
  1997年   14篇
  1996年   12篇
  1995年   10篇
  1994年   9篇
  1993年   10篇
  1992年   7篇
  1991年   12篇
  1990年   8篇
  1989年   11篇
  1988年   10篇
  1987年   6篇
  1986年   7篇
  1985年   10篇
  1984年   10篇
  1983年   11篇
  1982年   10篇
  1981年   13篇
  1980年   11篇
  1979年   10篇
  1978年   6篇
  1977年   6篇
  1976年   6篇
  1973年   4篇
  1972年   3篇
  1971年   3篇
排序方式: 共有970条查询结果,搜索用时 312 毫秒
41.
Recent media attention has increased interest in behavioral, mental health, and academic correlates of involvement in bullying. Yet, there has not been much interest in investigating the co-occurrence of other health-risk behaviors, such as gang membership, weapon carrying, and substance use. The potential influence of contextual factors, such as youth ethnicity, urbanicity, and school characteristics, also has been overlooked in previous research. The current study examined different subtypes of involvement in bullying—as primarily a victim, as primarily a bully, as both a victim and bully, and no involvement—and the association with significant health-risk behaviors, including engaging in violence and substance use, as well as academic problems. The analyses use self-report data from 16,302 adolescents (50.3 % female, 62.2 % Caucasian, 37.8 % African American) enrolled in 52 high schools. A series of three-level HLM analyses revealed that bullies and bully/victims were generally at greatest of risk of being involved in violence, engaging in multiple types of substance use, and having academic problems. These findings extend prior research by emphasizing a potential link between involvement in bullying and multiple health-risk behaviors, particularly among urban and African American high school youth.  相似文献   
42.
Social cognitive models examining academic and career outcomes emphasize constructs such as attitude, interest, and self-efficacy as key factors affecting students’ pursuit of STEM (science, technology, engineering and math) courses and careers. The current research examines another under-researched component of social cognitive models: social support, and the relationship between this component and attitude and self-efficacy in math and science. A large cross-sectional design was used gathering data from 1,552 participants in four adolescent school settings from 5th grade to early college (41 % female, 80 % white). Students completed measures of perceived social support from parents, teachers and friends as well as their perceived ability and attitudes toward math and science. Fifth grade and college students reported higher levels of support from teachers and friends when compared to students at other grade levels. In addition, students who perceived greater social support for math and science from parents, teachers, and friends reported better attitudes and had higher perceptions of their abilities in math and science. Lastly, structural equation modeling revealed that social support had both a direct effect on math and science perceived abilities and an indirect effect mediated through math and science attitudes. Findings suggest that students who perceive greater social support for math and science from parents, teachers, and friends have more positive attitudes toward math and science and a higher sense of their own competence in these subjects.  相似文献   
43.
44.
45.
46.
47.
48.
49.
To investigate the incidence and correlates of bulimic behavior, 1268 high school females were surveyed. A 47-item questionnaire was used to identify a group of students that would meet the DSM-III criteria for a probable diagnosis of bulimia. Students were then compared across the four content areas of demographics; body perception and weight information; dieting, exercise and menstrual behavior; and frequency of bingeing and purging behavior. Results indicated that 4.9% of the students met rigorous criteria for the diagnosis of bulimia. Between-group comparisons indicated that body dissatisfaction, drive for thinness, and chronicity of dieting differentiated the two groups.This work was supported by Biomedical Research Grant #RR5476, the Sears Allstate Foundation, and the George and Tina Barr Foundation.Main interest is eating disorders.  相似文献   
50.
Fighting G-force     
Rosenberg D 《Newsweek》2002,139(23):49
  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