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   120470篇
  免费   4273篇
  国内免费   37篇
  124780篇
  2020年   1120篇
  2019年   1387篇
  2018年   4772篇
  2017年   4223篇
  2016年   3921篇
  2015年   1659篇
  2014年   1853篇
  2013年   8544篇
  2012年   3793篇
  2011年   5381篇
  2010年   4214篇
  2009年   3420篇
  2008年   4395篇
  2007年   4766篇
  2006年   2787篇
  2005年   2586篇
  2004年   2464篇
  2003年   2304篇
  2002年   2289篇
  2001年   3319篇
  2000年   3206篇
  1999年   2403篇
  1998年   1210篇
  1997年   1074篇
  1996年   1103篇
  1995年   999篇
  1993年   980篇
  1992年   2009篇
  1991年   1875篇
  1990年   1895篇
  1989年   1737篇
  1988年   1698篇
  1987年   1618篇
  1986年   1651篇
  1985年   1718篇
  1984年   1461篇
  1983年   1293篇
  1981年   952篇
  1979年   1521篇
  1978年   1116篇
  1975年   1225篇
  1974年   1362篇
  1973年   1472篇
  1972年   1221篇
  1971年   1146篇
  1970年   1019篇
  1969年   1041篇
  1968年   1305篇
  1967年   1178篇
  1966年   1062篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
41.
This study examined the role of illness uncertainty in pain coping among women with fibromyalgia (FM), a chronic pain condition of unknown origin. Fifty-one FM participants completed initial demographic and illness uncertainty questionnaires and underwent 10-12 weekly interviews regarding pain, coping difficulty, and coping efficacy. Main outcome measures included weekly levels of difficulty coping with FM symptoms and coping efficacy. Multilevel analyses indicated that pain elevations for those high in illness uncertainty predicted increases in coping difficulty. Furthermore, when participants had more difficulty coping, they reported lower levels of coping efficacy. Results were consistent with hypothesized effects. Illness uncertainty accompanied by episodic pain negatively influenced coping efficacy, an important resource in adaptation to FM.  相似文献   
42.
43.
This study evaluated cardiovascular responses (CVR) to an active speech task with blatantly discriminatory (BRC) versus neutral (NRC) stimuli and an anger recall task in a sample of Black men (N = 73; age 18 to 47). Diastolic blood pressure scores were higher for NRC versus BRC stimuli during anger recall (p = .05). Moreover, persons in the NRC group who perceived high levels of racism (vs. no racism or BRC group) during active speech showed larger increases in blood pressure across postspeech rest, anger recall, and subsequent rest (p = .03). The notable elevation in CVR in response to an ambiguous event extends current models of racism suggesting that subtle racism is a psychosocial stressor that erodes health through chronically elevated CVR.  相似文献   
44.
Do the conditions under which promises are made determine whether they ought to be kept? Philosophers have placed a number of conditions on promising which, they hold, must be met in order to make promise-keeping obligatory. In so doing, they have distinguished valid promises from invalid promises and justified promises from promises that are not justified. Considering such conditions, one by one, we argue that they are mistaken. In the first place, the conditions they lay down are not necessary for either valid or justified promise-making. In the second place, promises need not meet such conditions in order to create moral obligations. In general, such analyses of promising fail because they suffer from a confusion between promise-making and promise-keeping. Philosophers have wrongly supposed that obligations to keep promises are dependent upon, or derivable from, the quality of the promises themselves, at the time they are made, instead of focusing on conditions that must be satisfied at the time when promises are supposed to be kept. It is not the quality of a promise that determines an obligation to keep it but the rightness or wrongness of performing the promised act.  相似文献   
45.
46.
47.
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   
48.
49.
50.
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