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   16342篇
  免费   633篇
  国内免费   9篇
  16984篇
  2022年   102篇
  2021年   178篇
  2020年   295篇
  2019年   329篇
  2018年   481篇
  2017年   443篇
  2016年   509篇
  2015年   322篇
  2014年   413篇
  2013年   1659篇
  2012年   708篇
  2011年   681篇
  2010年   488篇
  2009年   524篇
  2008年   695篇
  2007年   675篇
  2006年   598篇
  2005年   514篇
  2004年   546篇
  2003年   484篇
  2002年   471篇
  2001年   309篇
  2000年   290篇
  1999年   263篇
  1998年   222篇
  1997年   193篇
  1996年   147篇
  1995年   177篇
  1994年   174篇
  1993年   179篇
  1992年   184篇
  1991年   182篇
  1990年   168篇
  1989年   166篇
  1988年   172篇
  1987年   163篇
  1986年   136篇
  1985年   158篇
  1984年   173篇
  1983年   142篇
  1982年   157篇
  1981年   152篇
  1980年   137篇
  1979年   160篇
  1978年   165篇
  1977年   140篇
  1976年   138篇
  1975年   127篇
  1974年   136篇
  1973年   111篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
In two studies of Japanese and Australian university students, we examined the resource allocation rules of equity and equality. In both cultures, subjects were universalistic rather than relativistic in their judgments of fairness and alterability of these rules in the work place. They judged the equity rule to be unalterable by legislation or consensus. However, in both studies, the Japanese perceived equity to be less fair and equality to be less unfair than their Australian counterparts. In addition, study 2 indicated that cross-cultural differences in judgments of fairness were influenced by consideration of need. The age of the worker was a more important determinant of fairness judgments for Japanese than for Australians; the debt of a worker was a more important déterminant for Australians than for Japanese. The results are discussed with regard to the role of culture in conceptions of distributive justice.  相似文献   
32.
Hindsight bias: An interaction of automatic and motivational factors?   总被引:1,自引:0,他引:1  
If subjects are asked to recollect a former response after having been informed about the correct response, their recollection tends to approach the correct response. This effect has been termedhindsight bias. We studied hindsight bias in an experiment requiring numerical responses to almanac-type questions for physical quantities. We varied (1) the time at which the correct information was provided, (2) the encoding of the original responses by asking/not asking subjects to give a reason for the respective response, and (3) the motivation to recall correctly. We found that hindsight is less biased if reasons are given and if the correct information is provided at an earlier time. Motivation had only interactive effects: (1) With high motivation to recall correctly, the time the correct information was provided had no influence. (2) With reasons given, the variation of motivation showed no effect. These results rule out purely motivational and purely automatic explanations.  相似文献   
33.
Despite widespread popular belief in the activation of recurrent lesions in genital herpes simplex virus (HSV) by psychosocial stress, little empirical evidence supports that contention. This study retrospectively examined the role of stress in activation of HSV lesions as mediated by social support. Participants were 59 volunteers who had self-reported culture-positive genital HSV for at least 10 months. Measures of stress proneness (State-Trait Anxiety Inventory; STAI-Trait), recent stressful events (Schedule of Recent Events; SRE), and subjective appraisal of stress (global self-rating) were administered along with measures of general social support and herpes-specific social support. When retrospective reports of HSV symptoms were examined using a multiple-regression approach, duration of disease and amount of herpes-specific social support were found to be significant moderators of the relation between stress and number of HSV recurrences in the preceding 12 months. When duration of disease was short (less than 4 years), stress (SRE) and number of recurrences were positively associated; when disease duration was longer, there was no relationship. Similarly, at low levels of herpes-specific social support, a positive relation between stress (SRE) and number of recurrences was found. However, at higher levels of herpes-specific social support, no association was found. No relation was found between stress proneness (STAI-Trait) and HSV symptoms. However, subjective appraisal (global rating) of stress in the preceding 12 months was positively and significantly correlated with reported number of recurrences. Results are discussed in terms of their clinical implications.  相似文献   
34.
35.
Black and White college students were studied to determine reactions to moral dilemmas when the race of the central character in the dilemma was changed.  相似文献   
36.
37.
38.
39.
This paper describes an amplifier for an electroencephalograph with gain of 1×104 to 1×106 and made entirely of commercially available IC components. The two-stage amplifier has a preamplifier stage with fixed gain of 1000, and a second stage with variable gain from 1 to 100. The final stage, an anti-aliasing filter, adds a gain of 10 to the signal. The circuit has high common mode rejection, low input bias current, very low noise characteristics, low offset voltages, and offset nulling capability built into the circuit.  相似文献   
40.
A unique relationship exists between physicians and philosophers — one that expands on the constructive potential of the liaison between physicians and, for example, theologians, on the one hand, or, social workers on the other. This liaison should focus in the scientific aspects of medicine, not just the ethical aspects. Philosophers can provide physicians with a perspective on both the philosophy and the history of medicine through the ages — a sense of how medicine has adapted to the social cultural and ethical needs of each period. This perspective, while emphasizing medicine asscience, should not be limited to matters of methodology, or to criteria for distinguishing science from other intellectual pursuits, but should be concerned also with the history, sociology and politics of science. Both physicians and philosophers stand to gain from a strengthening of their active liaison now as never before; but most of all, the public will be the beneficiary.  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