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   66263篇
  免费   2776篇
  国内免费   27篇
  69066篇
  2020年   862篇
  2019年   1012篇
  2018年   1419篇
  2017年   1403篇
  2016年   1515篇
  2015年   1072篇
  2014年   1328篇
  2013年   5982篇
  2012年   2392篇
  2011年   2403篇
  2010年   1503篇
  2009年   1551篇
  2008年   2150篇
  2007年   2120篇
  2006年   1908篇
  2005年   1611篇
  2004年   1689篇
  2003年   1600篇
  2002年   1528篇
  2001年   2087篇
  2000年   1975篇
  1999年   1510篇
  1998年   782篇
  1997年   671篇
  1996年   697篇
  1995年   667篇
  1994年   658篇
  1993年   638篇
  1992年   1220篇
  1991年   1122篇
  1990年   1086篇
  1989年   1045篇
  1988年   1033篇
  1987年   958篇
  1986年   932篇
  1985年   995篇
  1984年   829篇
  1983年   712篇
  1982年   567篇
  1981年   572篇
  1979年   853篇
  1978年   657篇
  1977年   551篇
  1976年   552篇
  1975年   659篇
  1974年   753篇
  1973年   751篇
  1972年   636篇
  1971年   595篇
  1968年   624篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Younger adult students between 19 and 24 years of age (M = 21.3 years), older adult students between 61 and 76 years of age (M = 67.9 years), and older adult nonstudents between 62 and 76 years of age (M = 68.5 years) were assessed for health (self-ratings of physical and mental health), social functioning (self-ratings of physical and mental activity, perceived role activity level, perceived roles, locus of control, and age-norm expectations), and cognitive functioning (Wechsler Adult Intelligence Scale-Revised vocabulary and block design, and paired associate memory). Age differences were observed in self-ratings of health, social roles, intellectual performance, and memory. No student status differences were observed. The results are discussed in terms of plasticity of intellectual function and characteristics of student status in later adulthood.  相似文献   
992.
This study focuses on Divorce-Prone individuals and the question of why some persons fail in one marriage after another. The authors studied 12 individuals who had each been divorced two or more times. They found that the cases fell into one of three broad and overlapping groups. The groups have been called the Self-Involved Narcissists, the Compliant Depressed, and the Casualties of Life's Vicissitudes. The individuals and the groups demonstrate a different etiology, different treatment problems, and a very different prognosis.  相似文献   
993.
Major companies in the mainframe statistical software business have started producing powerful versions of their programs for microcomputers. Five of the leading microcomputer statistical packages are reviewed. A statistical software vendor directory is provided. These statistical packages can be used by properly trained personnel to make more reliable business decisions.  相似文献   
994.
This article describes some essential computer skills needed by psychology students seeking careers in business. It is suggested that students become familiar with computer software packages in the following areas: statistical analyses, wordprocessing, spreadsheets, data base managers, and graphics. Discussion is provided.Paper presented at the 57th Annual Convention of the Midwestern Psychological Association, Chicago, Illinois, May 1–3, 1985.  相似文献   
995.
996.
A survey of academic psychologists was taken to determine present use of computers in instruction, willingness to use good education software, and kinds of potential uses of computers in psychology courses. A majority of the respondents reported using computers in instruction. Respondents indicated substantial willingness to adopt computer-based courseware. Respondents believed that a variety of uses, including classroom demonstrations and student experiments, would facilitate student learning. The results of the survey are compared with the instructional modules the task force is developing.  相似文献   
997.
Although current theories of memory emphasize the fact that learning is an active process, there is little consensus on the role of active learning. This paper attempts to provide a more precise characterization of active learning in the acquisition of computer skills. The analysis of verbal protocols suggests that active learning varies on at least two dimensions: schema orientation and learning strategy. Schema orientation refers to the type of information the learner is acquiring and varies from relational information to procedural information. Learning strategy describes how the information is acquired. Some people prefer to be internally driven and form their own plans for learning. Others are externally driven and allow the instructional materials to guide their learning. These differences need to be taken into account in describing learning and in designing instructional materials.  相似文献   
998.
Although the typicality effect has been much studied in the semantic memory literature, typicality ratings exist for exemplars from only a very limited number of categories. This lack of ratings frequently limits the range of stimuli that can be used in investigations of the typicality effect. As an aid in stimulus construction, this paper reports typicality ratings of 893 exemplars from 93 different categories.  相似文献   
999.
An electronic device for detecting movement in small animals is described. The principle involves assessing changes in resistance between pairs of grid bars in a cage. The device is inexpensive, sensitive to movement, easy to calibrate and install, reliable across different activity arenas, and indifferent to animal size.  相似文献   
1000.
The concepts of informed consent and surveillance of human research designed to protect human subjects is commendable. The regulations of the Institutional Review Board (IRB) are having a major impact on clinical cancer research. There is greater administrative time needed of the investigator, the mechanisms of patient care have become cumbersome and some patients reject optional medical management that could be life saving. IRB regulations must be flexible to meet the needs of human subjects as well as those of the clinical investigator.  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