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   18478篇
  免费   752篇
  国内免费   18篇
  19248篇
  2021年   145篇
  2020年   265篇
  2019年   326篇
  2018年   461篇
  2017年   446篇
  2016年   485篇
  2015年   328篇
  2014年   416篇
  2013年   2054篇
  2012年   755篇
  2011年   820篇
  2010年   486篇
  2009年   526篇
  2008年   708篇
  2007年   700篇
  2006年   706篇
  2005年   668篇
  2004年   606篇
  2003年   628篇
  2002年   597篇
  2001年   332篇
  2000年   302篇
  1999年   292篇
  1998年   290篇
  1997年   268篇
  1996年   261篇
  1995年   225篇
  1994年   215篇
  1993年   200篇
  1992年   201篇
  1991年   234篇
  1990年   201篇
  1989年   193篇
  1988年   151篇
  1987年   174篇
  1986年   185篇
  1985年   213篇
  1984年   221篇
  1983年   192篇
  1982年   200篇
  1981年   212篇
  1980年   172篇
  1979年   173篇
  1978年   184篇
  1977年   168篇
  1976年   173篇
  1975年   152篇
  1974年   169篇
  1973年   147篇
  1972年   98篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
Native Hawaiian high school students, N = 1779, were surveyed for symptoms of psycho-pathology and suicide attempts in the previous 6 months. Seventy-seven (4.3%) of the students reported making a suicide attempt. There were no significant differences in prevalence rates for males and females. Depression, anxiety, aggression, substance abuse symptoms, and low family support, but not peer support, were significantly correlated with suicide attempts. On logistic regression, depression, substance abuse, and family support independently predicted attempts. The lack of gender difference may indicate a cultural characteristic of the Hawaiian population that differentiates it from mainstream American populations but likens it to the Native American population.  相似文献   
23.
The purpose of this meta-analysis of randomized controlled trials was to evaluate the efficacy of psychological interventions for adults with noncancerous chronic low back pain (CLBP). The authors updated and expanded upon prior meta-analyses by using broad definitions of CLBP and psychological intervention, a broad data search strategy, and state-of-the-art data analysis techniques. All relevant controlled clinical trials meeting the inclusion criteria were identified primarily through a computer-aided literature search. Two independent reviewers screened abstracts and articles for inclusion criteria and extracted relevant data. Cohen's d effect sizes were calculated by using a random effects model. Outcomes included pain intensity, emotional functioning, physical functioning (pain interference or pain-specific disability, health-related quality of life), participant ratings of global improvement, health care utilization, health care provider visits, pain medications, and employment/disability compensation status. A total of 205 effect sizes from 22 studies were pooled in 34 analyses. Positive effects of psychological interventions, contrasted with various control groups, were noted for pain intensity, pain-related interference, health-related quality of life, and depression. Cognitive-behavioral and self-regulatory treatments were specifically found to be efficacious. Multidisciplinary approaches that included a psychological component, when compared with active control conditions, were also noted to have positive short-term effects on pain interference and positive long-term effects on return to work. The results demonstrated positive effects of psychological interventions for CLBP. The rigor of the methods used, as well as the results that reflect mild to moderate heterogeneity and minimal publication bias, suggest confidence in the conclusions of this review.  相似文献   
24.
25.
26.
Much has been written about ways in which lower class Negro students can be motivated to seek middle class goals. Providing middle class role models for these students is one technique that is usually recommended, but seldom discussed analytically. The popular practice of providing only Negro adult role models to Negro children is challenged as being an activity that impedes the movement of lower class Negroes into the mainstream of American life.  相似文献   
27.
28.
A high proportion of positive responses was obtained from students who participated in three different types of pre-college orientation programs. Small group approaches consistently elicited more favorable responses than assemblies or large groups. Greater faculty involvement resulted in participants' noting an increased academic emphasis. Participants believed they had benefited in some way from programs which varied considerably as to length, activities, organization, and purposes.  相似文献   
29.
30.
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