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   1590006篇
  免费   131917篇
  国内免费   2506篇
耳鼻咽喉   21615篇
儿科学   52749篇
妇产科学   46114篇
基础医学   225816篇
口腔科学   47139篇
临床医学   139439篇
内科学   311187篇
皮肤病学   34033篇
神经病学   129202篇
特种医学   64834篇
外国民族医学   474篇
外科学   243194篇
综合类   39638篇
一般理论   544篇
预防医学   121808篇
眼科学   36335篇
药学   120811篇
  2篇
中国医学   2878篇
肿瘤学   86617篇
  2018年   14561篇
  2016年   12763篇
  2015年   14887篇
  2014年   20599篇
  2013年   31318篇
  2012年   42550篇
  2011年   44775篇
  2010年   26321篇
  2009年   25280篇
  2008年   43010篇
  2007年   45241篇
  2006年   46044篇
  2005年   44663篇
  2004年   44090篇
  2003年   42122篇
  2002年   41248篇
  2001年   75628篇
  2000年   78187篇
  1999年   66002篇
  1998年   16718篇
  1997年   15346篇
  1996年   15297篇
  1995年   15958篇
  1994年   15001篇
  1993年   14167篇
  1992年   55393篇
  1991年   53791篇
  1990年   52550篇
  1989年   50815篇
  1988年   47203篇
  1987年   46552篇
  1986年   44276篇
  1985年   42849篇
  1984年   32002篇
  1983年   27527篇
  1982年   16093篇
  1981年   14383篇
  1980年   13498篇
  1979年   30418篇
  1978年   21021篇
  1977年   17693篇
  1976年   16617篇
  1975年   17489篇
  1974年   21415篇
  1973年   20625篇
  1972年   18812篇
  1971年   17733篇
  1970年   16261篇
  1969年   15240篇
  1968年   13927篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
AIDS and Behavior - Although misperceived norms often drive personal health behaviors, we do not know about this phenomenon in the context of antiretroviral therapy (ART) adherence. We conducted a...  相似文献   
2.
Clinical Rheumatology - This study aimed to assess treatment patterns and frequency of inadequate response associated with advanced therapy initiation among patients with ankylosing spondylitis...  相似文献   
3.
Numerous studies showed that postural balance improves through light touch on a stable surface highlighting the importance of haptic information, seemingly downplaying the mechanical contributions of the support. The present study examined the mechanical effects of canes for assisting balance in healthy individuals challenged by standing on a beam. Sixteen participants supported themselves with two canes, one in each hand, and applied minimal, preferred, or maximum force onto the canes. They positioned the canes in the frontal plane or in a tripod configuration. Statistical analysis used a linear mixed model to evaluate the effects on the center of pressure and the center of mass. The canes significantly reduced the variability of the center of pressure and the center of mass to the same level as when standing on the ground. Increasing the exerted force beyond the preferred level yielded no further benefits, although in the preferred force condition, participants exploited the altered mechanics by resting their arms on the canes. The tripod configuration allowed for larger variability of the center of pressure in the task-irrelevant anterior–posterior dimension. High forces had a destabilizing effect on the canes: the displacement of the hand on the cane handle increased with the force. Given this static instability, these results show that using canes can provide not only mechanical benefits but also challenges. From a control perspective, effort can be reduced by resting the arms on the canes and by channeling noise in the task-irrelevant dimensions. However, larger forces exerted onto the canes can also have destabilizing effects and the instability of the canes needs to be counteracted, possibly by arm and shoulder stiffness. Insights into the variety of mechanical effects is important for the design of canes and the instructions of how to use them.  相似文献   
4.

There are few published procedures for teaching athletic skills to children with autism spectrum disorder (ASD). This study used a multiple baseline across participants design to evaluate the effects of prompting, demand fading, and differential reinforcement, on the basketball shooting skills of four school-aged boys diagnosed with ASD. During baseline, all four boys rarely made correct and accurate baskets at the regulation height and distance for their age-group in youth basketball. Following intervention, all four boys increased their percentage of correct shots and accuracy, compared to baseline, and their shooting skills transferred to the game of “P-I-G” with peers.

  相似文献   
5.

Fears regarding various aspects tend to stimulate individuals to escape or to avoid the sources of the threat. We concluded that fears associated with the future aging process, like the fear of aging-related diseases, the fear of loneliness in old age, and the fear of death, would stimulate patterns of avoidance when it comes to ideal life expectancy. We expected fear of aging-related diseases and fear of loneliness in old age to be related to lower ideal life expectancies. We expected fear of death to be related to higher ideal life expectancies. In two adult lifespan samples [N1?=?1065 and N2?=?591; ages ranging from 18 to 95 years, M (SD)1?=?58.1 (17.2) years, M (SD)2?=?52.6 (18.1) years], we were able to support our hypothesis regarding fear of death. We furthermore found significant interactions among the fears, indicating that individuals fearing diseases or loneliness but being unafraid of death opted for the shortest lives. Our results indicate that fears regarding life in very old age might be associated with the wish to avoid this age period; the fear of death was however associated with the wish for particularly long lives, and thus, with distancing oneself from the dreaded event of death. We conclude that fears seem to be associated with how individuals approach old age and with what they wish for in their own future as aged people.

  相似文献   
6.
7.
8.
9.
10.
Clinical Oral Investigations - To analyze differences in variation of orthodontic diagnostic measurements on lateral cephalograms reconstructed from ultra low dose-low dose (ULD-LD) cone beam...  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