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   30910篇
  免费   2511篇
  国内免费   47篇
耳鼻咽喉   333篇
儿科学   989篇
妇产科学   719篇
基础医学   4178篇
口腔科学   567篇
临床医学   3655篇
内科学   5929篇
皮肤病学   535篇
神经病学   3072篇
特种医学   937篇
外国民族医学   2篇
外科学   4180篇
综合类   454篇
一般理论   29篇
预防医学   3127篇
眼科学   755篇
药学   2217篇
  3篇
中国医学   36篇
肿瘤学   1751篇
  2022年   260篇
  2021年   629篇
  2020年   347篇
  2019年   579篇
  2018年   627篇
  2017年   494篇
  2016年   549篇
  2015年   613篇
  2014年   910篇
  2013年   1253篇
  2012年   1906篇
  2011年   2020篇
  2010年   1006篇
  2009年   972篇
  2008年   1653篇
  2007年   1669篇
  2006年   1666篇
  2005年   1568篇
  2004年   1556篇
  2003年   1467篇
  2002年   1279篇
  2001年   610篇
  2000年   620篇
  1999年   579篇
  1998年   356篇
  1997年   252篇
  1996年   282篇
  1995年   255篇
  1994年   207篇
  1993年   222篇
  1992年   477篇
  1991年   451篇
  1990年   445篇
  1989年   410篇
  1988年   410篇
  1987年   397篇
  1986年   384篇
  1985年   403篇
  1984年   322篇
  1983年   259篇
  1982年   189篇
  1981年   172篇
  1980年   168篇
  1979年   275篇
  1978年   201篇
  1977年   154篇
  1976年   149篇
  1975年   149篇
  1974年   149篇
  1973年   151篇
排序方式: 共有10000条查询结果,搜索用时 841 毫秒
81.
82.
83.
84.
85.
86.
Recent research suggests that, for some people with severe mental illness, supported employment could improve vocational outcomes for little additional expense. This study describes the costs and client outcomes in one mental health center that converted two rehabilitative day treatment programs to supported employment. Converting from day treatment to supported employment improved vocational outcomes significantly without increasing costs. Although total costs for community treatment were lower in both sites after implementing supported employment, differences appeared to be due to decreasing unit costs over the study period. Results illustrate the importance of testing the effects of cost estimation methods on findings.This study was supported by West Central Services, the New Hampshire Division of Mental Health and Developmental Services, and NIMH grant K02-MH-00839. The authors are grateful to Jesse Turner and Phil Wyzik for facilitating the research.  相似文献   
87.
Chorioretinal neovascular membranes are a recognised but rare cause of late visual loss in eyes suffering contusional injuries. A series of eight cases is presented all with indirect choroidal ruptures involving the perifoveal region. Two main patterns of 'at risk' rupture were noted: a temporally situated rupture passing almost directly through the fovea, and a rupture which curves inferior or superior to the optic disc stopping just short of the fovea. In six of eight cases there was only a partial thickness rupture of the choroid. These neovascular membranes may present at any time after the original injury, either early (within six months of the injury), which could be related to persistence of the normal reparative neovascular response, or late (at least one year after the injury), which are more likely to have resulted from a secondary breakdown of the outer blood-retina barrier.  相似文献   
88.
A case of benign symmetrical lipomatosis (Madelung-Launois-Bensaude syndrome) is described. The characteristic clinical features and the association with chronic alcoholism are reported.  相似文献   
89.
We have shown that stress fractures can be induced in the tibial diaphysis of an animal model by the repeated application of non-traumatic impulsive loads. The right hind limbs of 31 rabbits were loaded for three to nine weeks and changes in the bone were monitored by radiography and bone scintigraphy. The presence of stress fractures was confirmed histologically in some cases. Most animals sustained a stress fracture within six weeks and there was a positive correspondence between scintigraphic change and radiological evidence. Microscopic damage was evident at the sites of positive bone scans. The progression, location, and time of onset of stress fractures in this animal model were similar to those in clinical reports, making the model a useful one for the study of the aetiology of stress fractures.  相似文献   
90.
Say yes to life: a pilot study.   总被引:1,自引:1,他引:0       下载免费PDF全文
In an attempt to assess whether there are any characteristics which a majority of ordinary people regard as life-affirming or life-denying, a questionnaire was given to a pilot group of 167 respondents, representing three different age and social categories. Five life-affirming and five life-denying characteristics were mentioned by more than 10% of respondents. Of the former, Drive, Sociability, Happiness and Optimism were endorsed by 15-20%. Of the latter, Unsociability and Poor Coping were mentioned by 22%, making them distinctly more frequent than the following categories of Pessimism, Lack of Drive and Unhappiness (11-14%). It is suggested that a number of these subjectively determined characteristics, which the general public perceive as being life-affirming or denying, do indeed influence physical or mental health, illness or illness behaviour. It may therefore be of value to utilize this set of public perceptions in future programmes of health education.  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