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   173899篇
  免费   7836篇
  国内免费   156篇
  2021年   1491篇
  2020年   2769篇
  2019年   3430篇
  2018年   3527篇
  2017年   3967篇
  2016年   4618篇
  2015年   3920篇
  2014年   4785篇
  2013年   23432篇
  2012年   4570篇
  2011年   3746篇
  2010年   3886篇
  2009年   4756篇
  2008年   3897篇
  2007年   3475篇
  2006年   4084篇
  2005年   4058篇
  2004年   3558篇
  2003年   3152篇
  2002年   3003篇
  2001年   3275篇
  2000年   3078篇
  1999年   3114篇
  1998年   2838篇
  1997年   2662篇
  1996年   2580篇
  1995年   2410篇
  1994年   2380篇
  1993年   2327篇
  1992年   2558篇
  1991年   2406篇
  1990年   2261篇
  1989年   2212篇
  1988年   2184篇
  1987年   2208篇
  1986年   2174篇
  1985年   2432篇
  1984年   2521篇
  1983年   2324篇
  1982年   2377篇
  1981年   2347篇
  1980年   2189篇
  1979年   2219篇
  1978年   2181篇
  1977年   2142篇
  1976年   1963篇
  1975年   2006篇
  1974年   2051篇
  1973年   1956篇
  1972年   1532篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
111.
Evaluated the effect of varied physician affect on subject recall, anxiety, and perceptions in a simulated tense and ambiguous medical situation. Forty women at risk for breast cancer viewed videotapes of an oncologist presenting--with either worried or nonworried affect--mammogram results. Although the mammogram results and the oncologist were the same in both presentation, analyses indicated that, compared to the women receiving the results from a nonworried physician, the women receiving the results from a worried physician recalled significantly less information, perceived the clinical situation as significantly more severe, reported significantly higher levels of state anxiety, and had significantly higher pulse rates. These results suggest that physician affect plays a critical role in patient reaction to medical information. Implications for compliance research, patient satisfaction, and physician training are discussed.  相似文献   
112.
The ability of two species of tits to remember the location and/or features of an object was tested in a delayed-matching-to-sample procedure. Three values of retention interval between presentation of the sample stimulus and the choice--30 sec, 5 min, and 15 min--were used. Both species performed at above-chance level at all retention intervals, and there was no significant decline in accuracy with increasing interval. A pool of 100 stimulus objects was used, but the results of control trials indicated that the birds responded primarily to location rather than stimulus features of the object itseif. Although the food-storing marsh tit tended to perform at a higher level than the non-storing great tit, the only significant difference between the species was in the first 50 trials of the first treatment, when the birds were acquiring the task. The results are discussed in relation to the hypothesized special memory capacity of food-storing birds.  相似文献   
113.
114.
115.
Journal of Religion and Health - Exposure to environmental tobacco smoke (ETS) is associated with increased risk of disease and death. Reports on ETS and religion are lacking. Data from the...  相似文献   
116.
117.
118.
As the complexity of the challenges presented by our interactions with our planet continues to grow, we must develop new modes of knowledge production. In these modes, distinctions between multidisciplinary and inter-disciplinary activities and processes have renewed importance. There are at least two distinct types of interdisciplinary activities distinguished by the disciplinary breadth they attempt to bridge. In the narrow case, reductionist processes reveal a common underlying principle or process which can serve as a Rosetta stone. In the broad case, no such common arbiter exists. Investigators must develop integrating vocabulary in the context of the full breadth of their work. His primary activities are the fostering of university-wide interdisciplinary research and curriculum programs focused on global change with the goal of developing Columbia into a world leader in issues related to global stewardship.  相似文献   
119.
120.
Most studies of suicide in younger patients have demonstrated significant alterations in the serotonin system. Although a high percentage of completed suicides occur in late-life, to date very few studies of the biology of suicide have focused on this age group. This chapter describes age-related changes in the central nervous system pertinent to the biology of suicide, then reviews post-mortem biological studies of the brains of suicides and suicide attempters. As suicide attempts in the elderly are characterized by the use of violent means, biologic studies of impulsive violence are discussed. Finally we describe data on the effect of degenerative diseases on the serotonin system and the possible link to increased suicidal behavior in affected patients. This review underscores the need for further study of the biology of suicide in the geriatric age group.  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