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   32892篇
  免费   1257篇
  国内免费   14篇
  2020年   346篇
  2019年   357篇
  2018年   568篇
  2017年   598篇
  2016年   601篇
  2015年   411篇
  2014年   504篇
  2013年   2435篇
  2012年   939篇
  2011年   1025篇
  2010年   630篇
  2009年   581篇
  2008年   854篇
  2007年   826篇
  2006年   757篇
  2005年   662篇
  2004年   630篇
  2003年   582篇
  2002年   653篇
  2001年   1105篇
  2000年   1094篇
  1999年   797篇
  1998年   361篇
  1997年   297篇
  1992年   643篇
  1991年   606篇
  1990年   637篇
  1989年   607篇
  1988年   587篇
  1987年   564篇
  1986年   571篇
  1985年   580篇
  1984年   477篇
  1983年   403篇
  1982年   344篇
  1981年   298篇
  1979年   520篇
  1978年   368篇
  1977年   338篇
  1976年   307篇
  1975年   472篇
  1974年   522篇
  1973年   524篇
  1972年   472篇
  1971年   418篇
  1970年   369篇
  1969年   449篇
  1968年   513篇
  1967年   442篇
  1966年   452篇
排序方式: 共有10000条查询结果,搜索用时 15 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.
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   
9.
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