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   11521篇
  免费   999篇
  国内免费   866篇
  2024年   31篇
  2023年   205篇
  2022年   161篇
  2021年   240篇
  2020年   504篇
  2019年   532篇
  2018年   499篇
  2017年   533篇
  2016年   473篇
  2015年   352篇
  2014年   427篇
  2013年   1359篇
  2012年   279篇
  2011年   442篇
  2010年   371篇
  2009年   469篇
  2008年   552篇
  2007年   633篇
  2006年   627篇
  2005年   546篇
  2004年   517篇
  2003年   398篇
  2002年   329篇
  2001年   225篇
  2000年   185篇
  1999年   166篇
  1998年   141篇
  1997年   110篇
  1996年   84篇
  1995年   97篇
  1994年   70篇
  1993年   57篇
  1992年   42篇
  1991年   33篇
  1990年   31篇
  1989年   38篇
  1987年   28篇
  1985年   167篇
  1984年   179篇
  1983年   141篇
  1982年   140篇
  1981年   115篇
  1980年   117篇
  1979年   117篇
  1978年   157篇
  1977年   105篇
  1976年   101篇
  1975年   84篇
  1974年   73篇
  1973年   70篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
Despite evidence of the safety and effectiveness of COVID-19 vaccines and their wide availability, many in the U.S. are not vaccinated. Research demonstrates that prosocial orientations predict COVID-19 health behaviors (e.g., social distancing) and vaccination intentions, however, little work has examined COVID-19 vaccination willingness in the U.S. since vaccines were approved. Findings from two U.S. samples show that, in contrast to other COVID-19 health behaviors, vaccine willingness in unvaccinated people is unrelated to prosocial orientation. Study 2 demonstrates that the lack of association between vaccine willingness and prosocial orientation in unvaccinated participants was specific to those with stronger beliefs that COVID-19 vaccines are ineffective. Thus, in prosocial people, perceptions of vaccines' ineffectiveness may undermine COVID-19 vaccine willingness.  相似文献   
112.
113.
In response to Zuckerman's comments on my factor analyses of the MAACL-R, I focus on the statistical issues of the cutoff criterion for factor loadings and the evidence for the discriminant validity of the five-factor solution. Based upon the conclusions I draw in these two areas, I recommend that researchers either (a) use the two factor solution to the MAACL-R represented in the summary scores of Dysphoria and Positive Affect + Sensation Seeking or (b) include all MAACL-R scales in their studies and analyze their data to determine whether it is statistically appropriate to report results from a single scale (A, D, H, PA, or SS) rather than from the summary scores.  相似文献   
114.
The degree of structural and functional specialization that differentiates between upper and lower limb use in humans is quite unparalleled among primates. It is argued that less neural resources are devoted to leg and foot control than to arm and hand control, and that this aspect of lower limb innervation, together with the uniquely restricted use of the lower limb, renders lower limb function more sensitive to general neural insult. In addition, the status of leg and foot control differs from that of arm and hand control both early in life and during the later years of decline.  相似文献   
115.
The issues involved in decision making about the aggressiveness of future medical care for older persons are explored. They are related to population trends, the heterogeneity of older persons and a variety of factors involved in individual preferences. Case studies are presented to illustrate these points, as well as a review of pertinent literature. The argument is offered that, considering these many factors, a system of flexible, individualized care by informed patient preference, is more rational than the rationing of technological services by age.  相似文献   
116.
This paper examines the ethical issues of conflict of interest raised by the burgeoning development of physician involvement in for-profit entrepreneurial activities outside their practice. After documenting the nature and extent of these activities, and their potential for conflicts of interest, the paper assesses the major arguments for and against physicians' referral of patients to facilities they own or in which they invest. The paper concludes that an outright ban on such activity seems ethically warranted.  相似文献   
117.
燕国材 《心理学报》1993,26(4):94-101
该文较系统地论述了孟子的普通心理思想。主要问题是:心理学思想的基本观点,知虑心理思想,情欲心理思想,志意心理思想,智能心理思想,性习心理思想。  相似文献   
118.
Philip Hefzer 《Zygon》1993,28(1):77-101
Abstract. The paper consists of an argument that goes as follows. Symbols and their elaboration into myths constitute Homo sapiens 's most primitive reading of the world and the relation of humans to that world. They are, in other words, primordial units of cultural information, emerging very early in human history, representing a significant achievement in the evolution of human self-consciousness and reflection. The classic myths of Fall and Original Sin, as well as the doctrines to which they gave rise, are further interpretations of this primordial information. The doctrinal traditions of the first four centuries of Christianity are surveyed. Three sets of data as interpreted by the biological sciences are offered as resources for understanding the biogenetic grounds of the experience that the symbols, myths, and doctrines of Fall and Original Sin seek to interpret. The conclusions to be drawn are that (1) the symbolic material is indeed commensurate with the scientific understandings, and (2) the scientific interpretations deepen our understanding of the symbols, while (3) the conversation between the symbols and the science once again raises certain perennial questions about human existence.  相似文献   
119.
120.
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