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   97512篇
  免费   3056篇
  国内免费   27篇
  2019年   942篇
  2018年   4348篇
  2017年   3726篇
  2016年   3394篇
  2015年   1207篇
  2014年   1255篇
  2013年   5884篇
  2012年   2708篇
  2011年   4512篇
  2010年   3734篇
  2009年   2826篇
  2008年   3660篇
  2007年   4030篇
  2006年   1950篇
  2005年   1948篇
  2004年   1772篇
  2003年   1640篇
  2002年   1725篇
  2001年   2463篇
  2000年   2440篇
  1999年   1804篇
  1998年   897篇
  1997年   816篇
  1996年   791篇
  1992年   1574篇
  1991年   1489篇
  1990年   1462篇
  1989年   1369篇
  1988年   1307篇
  1987年   1274篇
  1986年   1367篇
  1985年   1409篇
  1984年   1191篇
  1983年   1062篇
  1982年   776篇
  1981年   813篇
  1979年   1258篇
  1978年   921篇
  1977年   759篇
  1976年   744篇
  1975年   1081篇
  1974年   1171篇
  1973年   1285篇
  1972年   1099篇
  1971年   1024篇
  1970年   946篇
  1969年   974篇
  1968年   1238篇
  1967年   1143篇
  1966年   1013篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
Are different responses differentially associable with their consequences? An overshadowing design was used to try to answer this question for three responses previously studied in golden hamsters. In Experiment I, scrabbling was rapidly suppressed by electric shock punishment, and it overshadowed a tone which occurred between scrabbling and shock. In Experiment II, no evidence of response-shock association was obtained when open rearing was the punished response, and open rearing did not overshadow the tone. Punishment had some effect on face washing, but there was no statistically significant overshadowing with this response. These results are consistent with the idea that differences in punishment suppression among these three responses have an associative basis. They also demonstrate the usefulness of a novel paradigm for studying “preparedness” of response-reinforcer associations.  相似文献   
72.
73.
74.
75.
76.
This study addresses the demands of alternating bimanual syncopation, a coordination mode in which the two hands move in alternation while tapping in antiphase with a metronomic tone sequence. Musically trained participants were required to engage in alternating bimanual syncopation and five other coordination modes: unimanual syncopation where taps are made (with the left or right hand) after every tone; unimanual syncopation where taps are made after every other tone; bimanual synchronization with alternating hands; unimanual synchronized tapping with every tone; and unimanual tapping with every other tone. Variability in tap timing was greatest overall for alternating bimanual syncopation, indicating that it is the most difficult. This appears to be due to instability arising from the simultaneous presence of two levels of antiphase coordination (one between the pacing sequence and the hands, the other between the two hands) rather than factors relating to movement frequency or dexterity limits of the nonpreferred hand.  相似文献   
77.
This paper examines college students' attributions about suicide as a function of gender and context (athletic vs. relationship failure). Results indicated that male athletes who suicided were considered more emotionally well-adjusted compared to males who suicided because of a relationship failure and all females. Male and female athletes who suicided were seen as more competent and less distressed compared to those who suffered a failed relationship. Females were also seen as more distressed compared to males. These results are discussed in terms of a positive bias toward athletes in our society as well as gender stereotypes. Implications of these findings as well as methodological limitations are discussed.  相似文献   
78.
79.
80.
Reducing STDs and HIV/AIDS incidence requires campaigns designed to change knowledge, attitudes, and practices of risky sexual behavior. In China, a significant obstacle to such changes is the stigma associated with these diseases. Thus 1 campaign intervention strategy is to train credible community leaders to discuss these issues in everyday social venues. This study tested the effectiveness of such an approach on reducing HIV/AIDS stigma, across 2 years, from a sample of over 4,500 market vendors, in 3 conditions. Results showed an increasing growth in market communication about intervention messages, and concomitant declines in stigmatizing attitudes, across time, with the greatest changes in community popular opinion leaders, significant changes in intervention nonopinion leaders, and little change in the control markets.  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