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   32581篇
  免费   1243篇
  国内免费   14篇
  2020年   337篇
  2019年   350篇
  2018年   561篇
  2017年   585篇
  2016年   590篇
  2015年   397篇
  2014年   492篇
  2013年   2414篇
  2012年   934篇
  2011年   1008篇
  2010年   617篇
  2009年   556篇
  2008年   845篇
  2007年   817篇
  2006年   745篇
  2005年   656篇
  2004年   628篇
  2003年   576篇
  2002年   641篇
  2001年   1103篇
  2000年   1084篇
  1999年   791篇
  1998年   358篇
  1997年   292篇
  1992年   636篇
  1991年   600篇
  1990年   627篇
  1989年   603篇
  1988年   581篇
  1987年   557篇
  1986年   565篇
  1985年   586篇
  1984年   480篇
  1983年   407篇
  1982年   343篇
  1981年   294篇
  1979年   523篇
  1978年   365篇
  1977年   340篇
  1976年   305篇
  1975年   468篇
  1974年   514篇
  1973年   523篇
  1972年   472篇
  1971年   418篇
  1970年   369篇
  1969年   442篇
  1968年   512篇
  1967年   437篇
  1966年   452篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
Rats received Pavlovian conditioning in which food was signalled by a visual stimulus, A+, an auditory stimulus, B+, and a compound composed of different visual and auditory stimuli, CD+. Test trials were then given with the compound AB. Experiments 1 and 2A revealed stronger responding during AB than during CD. In Experiment 2B, there was no evidence of a summation of responding during AB when A+ B+ training was conducted in the absence of CD+ trials. A further failure to observe abnormally strong responding during ABwas found in Experiment 3 for which the training trials with A+ B+ CD+ were accompanied by trials in which C and D were separately paired with food. The results are explained in terms of a configural theory of conditioning, which assumes that responding during a compound is determined by generalization from its components, as well as from other compounds to which it is similar.  相似文献   
2.
3.
4.
5.
6.
7.
Evaluated the effect of varied physician affect on subject recall, anxiety, and perceptions in a simulated tense and ambiguous medical situation. Forty women at risk for breast cancer viewed videotapes of an oncologist presenting--with either worried or nonworried affect--mammogram results. Although the mammogram results and the oncologist were the same in both presentation, analyses indicated that, compared to the women receiving the results from a nonworried physician, the women receiving the results from a worried physician recalled significantly less information, perceived the clinical situation as significantly more severe, reported significantly higher levels of state anxiety, and had significantly higher pulse rates. These results suggest that physician affect plays a critical role in patient reaction to medical information. Implications for compliance research, patient satisfaction, and physician training are discussed.  相似文献   
8.
From the standpoint of a former journal editor and long‐time professional, this commentary challenges the direction of the profession as demonstrated in this special section. The ongoing creation of more and more ethical constraints not only harms the profession but also loses sight of fundamental ethical principles.  相似文献   
9.
OBJECTIVE: To test a theoretical model of how ethnic pride and self-control are related to risk and protective factors. DESIGN: A community sample of 670 African American youth (mean age = 11.2 years) were interviewed in households. MAIN OUTCOME MEASURES: Measures of cigarette smoking, alcohol use, and sexual behavior (lifetime to past month). RESULTS: Structural modeling analyses indicated parenting was related to self-control and self-esteem, and racial socialization was related to ethnic pride. Self-control and self-esteem variables were related to levels of deviance-prone attitudes and to perceptions of engagers in, or abstainers from, substance use and sexual behavior. The proximal factors (behavioral willingness, resistance efficacy, and peer behavior) had substantial relations to the criterion variables. Participant gender and parental education also had several paths in the model. Results were generally similar for the 2 outcome behaviors. CONCLUSIONS: In this population, self-esteem and self-control are related to parenting approaches and have pathways to attitudes and social perceptions that are significant factors for predisposing to, or protecting against, early involvement in substance use and sexual behavior.  相似文献   
10.
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