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   305754篇
  免费   10952篇
  国内免费   2006篇
耳鼻咽喉   4260篇
儿科学   10213篇
妇产科学   9724篇
基础医学   42443篇
口腔科学   9135篇
临床医学   23918篇
内科学   55244篇
皮肤病学   6797篇
神经病学   19124篇
特种医学   14195篇
外国民族医学   100篇
外科学   44947篇
综合类   6278篇
一般理论   35篇
预防医学   24258篇
眼科学   6987篇
药学   23121篇
  2篇
中国医学   955篇
肿瘤学   16976篇
  2018年   5044篇
  2017年   4978篇
  2016年   4282篇
  2015年   6181篇
  2014年   6024篇
  2013年   5655篇
  2012年   13068篇
  2011年   8258篇
  2010年   4329篇
  2009年   5759篇
  2008年   5239篇
  2007年   6186篇
  2006年   6426篇
  2005年   14074篇
  2004年   15395篇
  2003年   10795篇
  2002年   5904篇
  2001年   10893篇
  2000年   8536篇
  1999年   11291篇
  1998年   2316篇
  1997年   1625篇
  1992年   10339篇
  1991年   10618篇
  1990年   10603篇
  1989年   10243篇
  1988年   9670篇
  1987年   9259篇
  1986年   8807篇
  1985年   7998篇
  1984年   5474篇
  1983年   4593篇
  1982年   1941篇
  1981年   1568篇
  1980年   1573篇
  1979年   5568篇
  1978年   3442篇
  1977年   2697篇
  1976年   2424篇
  1975年   3548篇
  1974年   4340篇
  1973年   4065篇
  1972年   4007篇
  1971年   3855篇
  1970年   3580篇
  1969年   3475篇
  1968年   3176篇
  1967年   2961篇
  1966年   2657篇
  1965年   1579篇
排序方式: 共有10000条查询结果,搜索用时 754 毫秒
21.
22.
23.
24.
Neuroimaging studies using the social-exclusion paradigm Cyberball indicate increased dorsal anterior cingulate cortex (dACC) and right insula activity as a function of exclusion. However, comparatively less work has been done on how social status factors may moderate this finding. This study used the Cyberball paradigm with 85 (45 females) socio-economically diverse participants from a larger longitudinal sample. We tested whether neighborhood quality during adolescence would predict subsequent neural responding to social exclusion in young adulthood. Given previous behavioral studies indicating greater social vigilance and negative evaluation as a function of lower status, we expected that lower adolescent neighborhood quality would predict greater dACC activity during exclusion at young adulthood. Our findings indicate that young adults who lived in low-quality neighborhoods in adolescence showed greater dACC activity to social exclusion than those who lived in higher quality neighborhoods. Lower neighborhood quality also predicted greater prefrontal activation in the superior frontal gyrus, dorsal medial prefrontal cortex and the middle frontal gyrus, possibly indicating greater regulatory effort. Finally, this effect was not driven by subsequent ratings of distress during exclusion. In sum, adolescent neighborhood quality appears to potentiate neural responses to social exclusion in young adulthood, effects that are independent of felt distress.  相似文献   
25.
26.
Traditionally, major complications and unanticipated admission/readmission rates were used to assess outcome after day surgery. However, in view of the relative absence of major complications the quality of recovery (QOR) should be considered one of the principal endpoints after day surgery. In our study, the level of QOR is defined by a combination of the Global Surgical Recovery (GSR) Index and the Quality of Life (QOL).The aim of this study was to analyze prevalence and predictors of QOR after day surgery on the fourth postoperative day.Elective patients scheduled for day surgery from November 2008 to April 2010 were enrolled in a prospective cohort study. Outcome parameters were measured by using questionnaire packages at 2 time points: 1 week preoperatively and 4 days postoperatively. Primary outcome parameter is the QOR and is defined as good if the GSR index >80% as well as the postoperative QOL is unchanged or improved as compared with baseline. QOR is defined as poor if both the GSR index ≤80% and if the postoperative QOL is decreased as compared with baseline. QOR is defined as intermediate in all other cases. Three logistic regression analyses were performed to determine predictors for poor QOR after day surgery.A total of 1118 patients were included. A good QOR was noted in 17.3% of patients, an intermediate QOR in 34.8%, and a poor QOR in 47.8% 4 days after day surgery. The best predictor for poor QOR after day surgery was type of surgery. Other predictors were younger age, work status, and longer duration of surgery. A history of previous surgery, expected pain (by the patient) and high long-term surgical fear were significant predictors of poor QOR in only 1 of 3 prediction models.The QOR at home 4 days after day surgery was poor in the majority of patients and showed a significant procedure-specific variation. Patients at risk for poor QOR can be identified during the preoperative period based on type of surgery, age, work status, and the duration of the surgery.  相似文献   
27.
28.
29.
30.
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