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   6522篇
  免费   316篇
  国内免费   6篇
  2023年   64篇
  2022年   90篇
  2021年   115篇
  2020年   149篇
  2019年   153篇
  2018年   298篇
  2017年   277篇
  2016年   249篇
  2015年   172篇
  2014年   180篇
  2013年   814篇
  2012年   448篇
  2011年   453篇
  2010年   276篇
  2009年   203篇
  2008年   356篇
  2007年   307篇
  2006年   273篇
  2005年   256篇
  2004年   168篇
  2003年   172篇
  2002年   172篇
  2001年   81篇
  2000年   101篇
  1999年   69篇
  1998年   41篇
  1997年   37篇
  1996年   41篇
  1995年   46篇
  1994年   36篇
  1993年   34篇
  1992年   54篇
  1991年   31篇
  1990年   45篇
  1989年   36篇
  1988年   42篇
  1987年   31篇
  1986年   23篇
  1985年   29篇
  1984年   34篇
  1983年   31篇
  1982年   20篇
  1981年   22篇
  1980年   27篇
  1979年   32篇
  1978年   29篇
  1977年   22篇
  1976年   19篇
  1975年   21篇
  1974年   22篇
排序方式: 共有6844条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
The current study was designed to gain a better understanding of the nature of the relationship between substance use and sexual risk taking within a community sample of women (N = 1,004). Using confirmatory factor analysis, the authors examined the factor structure of sexual risk behaviors and substance use to determine whether they are best conceptualized as domains underlying a single, higher order, risk-taking propensity. A 2 higher order factor model (sexual risk behavior and substance use) provided the best fit to the data, suggesting that these 2 general risk domains are correlated but independent factors. Sensation seeking had large general direct effects on the 2 risk domains and large indirect effects on the 4 first-order factors and the individual indicators. Negative affect had smaller, yet still significant, effects. Impulsivity and anxiety were unrelated to sexual health risk domains.  相似文献   
5.
A growing literature has observed a significant reduction in pain sensitivity among hypertensive animals and humans. It is uncertain whether a reduced sensitivity to pain can be observed in nonnotensive individuals who go on to develop high blood pressure. Blood pressure (BP) was reassessed in one hundred fifteen 19-year-old boys initially tested at age 14, when they were also presented with a pain stimulus (mechanical finger pressure). Hierarchical regression analyses indicated that information regarding pain tolerance improved prediction of changes in systolic and diastolic blood pressure beyond that afforded by differences in BP at age 14, parental history of hypertension, and body mass index. These analyses suggest that pain sensitivity may be associated with physiological processes involved in the development of sustained high blood pressure.  相似文献   
6.
7.
Adherence to medications for chronic pediatric diseases decreases overtime. This randomized controlled trial evaluated a clinic-based, nurse-administered educational and behavioral intervention to prevent the anticipated drop in adherence to nonsteroidal medications among newly diagnosed patients with juvenile rheumatoid arthritis. Thirty-four participants completed the study (mean age = 8.44 years, SD = 3.96), including 19 in the experimental group and 15 in the standard-treatment (education) control group. There were significant group and Group x Time effects for adherence (assessed with an electronic monitor over a 13-month period) favoring the experimental group. In contrast, the groups did not differ significantly in disease activity or functional limitations. Factors that may have prevented detection of differences in these health parameters are dicussed.  相似文献   
8.
9.
10.
The processing of restrictive relative clauses in Hungarian   总被引:2,自引:0,他引:2  
B MacWhinney  C Pléh 《Cognition》1988,29(2):95-141
  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