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   20802篇
  免费   919篇
  国内免费   7篇
  2020年   274篇
  2019年   276篇
  2018年   409篇
  2017年   375篇
  2016年   466篇
  2015年   338篇
  2014年   379篇
  2013年   1688篇
  2012年   722篇
  2011年   740篇
  2010年   480篇
  2009年   494篇
  2008年   632篇
  2007年   689篇
  2006年   578篇
  2005年   564篇
  2004年   534篇
  2003年   494篇
  2002年   492篇
  2001年   779篇
  2000年   761篇
  1999年   551篇
  1998年   270篇
  1997年   239篇
  1996年   237篇
  1995年   210篇
  1994年   216篇
  1993年   174篇
  1992年   430篇
  1991年   383篇
  1990年   405篇
  1989年   329篇
  1988年   311篇
  1987年   318篇
  1986年   291篇
  1985年   296篇
  1984年   272篇
  1983年   250篇
  1982年   197篇
  1979年   259篇
  1978年   216篇
  1977年   173篇
  1975年   201篇
  1974年   243篇
  1973年   242篇
  1972年   195篇
  1971年   187篇
  1969年   179篇
  1968年   217篇
  1967年   194篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
The principles, design considerations, and components of a clinical information system intended to support and enhance the patient care, educational, and research missions of a comprehensive psychiatric institute are presented. Major characteristics of the system are its emphases on efficiency, simplicity, and intensive user involvement throughout the development of the system.  相似文献   
32.
33.
34.
This paper reports the operation of robust attentional bias to the top and right during perception of small, single geometric forms. Same/different judgements of successively presented standard and comparison forms are faster when local differences are located at top and right rather than in other regions of the forms. The bias persists when form size is reduced to approximately one degree of visual angle, and it is unaffected by saccadic eye movements and by instructions to attend to other reliably differentiating regions of the forms. Results lend support in various degrees to two of the possible explanations of the bias: (1) a static, skewed distribution of attentional resources around eye fixation; and (2) biased, covert scanning that commences invariably at the top and right of stim ulus forms. Origins of the bias in terms of possible left-hemispheric capacity for constructing representations of visual stimuli from parts, as well as in terms of reading experience and prevailing optic flow during locomotion through space are considered. Recent investigations of conditions under which the bias can be maintained or reduced are mentioned.  相似文献   
35.
36.
37.
Missing body homicide cases have gained public interest globally due to some high-profile cases. In many of these cases, the task of locating the victim's remains relies on the information investigators can gain through the interviewing of willing suspects. To date, investigative interviewing research has largely focused on the retrieval of episodic memory (events) without focusing on spatial memory, a prominent cognitive task required in locating a victim's remains. The current experiment tests the enhanced cognitive interview (ECI) against a free recall strategy in a mock homicide scenario where participants are required to hide and retrieve an object in a natural bushland setting. The results showed that those in the ECI condition produced more coarse- and fine-grained details of landmarks and their actions at and journeying to the deposition site. This demonstrates the value of using the ECI in generating more valuable information to assist in successive search attempts.  相似文献   
38.
39.
40.
The purpose of this study was to determine the effects of Type A behavior and family history of hypertension on cardiovascular reactivity to mental stress in a group of employed black women. Measures of heart rate and of systolic blood pressure (SBP) and diastolic blood pressure (DBP) were taken at rest, during a mental arithmetic task, and during the Type A Structured Interview (SI). Results indicated that the Type A behavior pattern was associated with SBP and DBP hyperresponsivity during the SI but not during mental arithmetic. Additionally, certain speech components of the Type A pattern, as well as features of the potential-for-hostility component, were also related to cardiovascular responses during the SI. Family history of hypertension did not influence the cardiovascular parameters either alone or in combination with Type A behavior. The results suggest that many of the cardiovascular response characteristics of the Type A pattern that have been observed in predominantly white samples also hold true for blacks. Replication of these findings with other subgroups of blacks, such as young females and middle-aged males, will help document the generality of these findings within the black population.  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