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   33989篇
  免费   5897篇
  国内免费   100篇
耳鼻咽喉   371篇
儿科学   930篇
妇产科学   1893篇
基础医学   2325篇
口腔科学   521篇
临床医学   16868篇
内科学   4775篇
皮肤病学   413篇
神经病学   1853篇
特种医学   749篇
外科学   3032篇
综合类   155篇
一般理论   14篇
预防医学   2755篇
眼科学   570篇
药学   1167篇
  1篇
中国医学   44篇
肿瘤学   1550篇
  2023年   852篇
  2022年   217篇
  2021年   555篇
  2020年   802篇
  2019年   505篇
  2018年   1435篇
  2017年   1617篇
  2016年   1725篇
  2015年   1804篇
  2014年   1905篇
  2013年   2345篇
  2012年   1227篇
  2011年   1602篇
  2010年   1514篇
  2009年   1802篇
  2008年   1420篇
  2007年   1412篇
  2006年   1336篇
  2005年   1222篇
  2004年   1101篇
  2003年   1033篇
  2002年   836篇
  2001年   914篇
  2000年   660篇
  1999年   774篇
  1998年   751篇
  1997年   807篇
  1996年   764篇
  1995年   664篇
  1994年   502篇
  1993年   392篇
  1992年   426篇
  1991年   408篇
  1990年   408篇
  1989年   366篇
  1988年   280篇
  1987年   260篇
  1986年   239篇
  1985年   262篇
  1984年   197篇
  1983年   182篇
  1982年   142篇
  1981年   143篇
  1980年   110篇
  1979年   165篇
  1978年   131篇
  1977年   145篇
  1976年   113篇
  1975年   95篇
  1972年   163篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
The midwifery art has emphasised the uniqueness of human beings throughout its Nordic history. The educated Nordic midwife has in the last decade celebrated several hundred years of memories. This article studies how the key ideas of the midwifery art and patterns of ideas become evident in the zeitgeist from the beginning of the 19th century to the millennium in the Nordic countries. The legacy and pattern of ideas of the art of midwifery are interpreted in relation to the texts of the selected historical sources and based on Ricoeur's phenomenological-hermeneutic approach to the text and further to the dedication of understanding and interpretation. The historical sources refer to unprinted primary sources from historical archives and printed secondary and tertiary sources. The patterns of ideas include a tripartite whole: the true cultivation of the head, the philosophy and aesthetics of the hand, the strength of the heart and the drive of calling. These ideas open for unique visions and attest to the evident in modern midwives. Today's midwives have academic training with examinations, and the education is based on scientific evidence. The midwife profession is authorised by the state and supervised by the authorities.  相似文献   
22.
23.

Objective

Low psoas muscle area is shown to be an indicator for worse postoperative outcome in patients undergoing vascular surgical. Additionally, it has been associated with longer durations of hospital stay in patients with cancer who undergo surgery and subsequently greater health care costs in Europe and the United States. We sought to evaluate this effect on hospital expenditure for patients undergoing vascular repair in a health care system with universal access.

Methods

Skeletal muscle mass was assessed on preoperative abdominal computed tomography scans of patients undergoing open aortic aneurysm repair in a retrospective fashion. The skeletal muscle index (SMI) was used to define low muscle mass. Health care costs were obtained for all patients and the relationship between a low SMI and higher costs was explored using linear regression and cross-sectional analysis.

Results

We included 156 patients (81.5% male) with a median age of 72 years undergoing elective surgery for infrarenal abdominal aortic aneurysm in this analysis. The median SMI for patients with low skeletal muscle mass was 53.21 cm2/kg and for patients without, 70.07 cm2/kg. Hospital duration of stay was 2 days longer in patients with low skeletal muscle mass as compared with patients with normal (14 days vs 11 days; P = .001), as was duration of intensive care stay (3 days vs 1 day; P = .01). The median overall hospital costs were €10,460 higher for patients with a low SMI as compared with patients with a normal physical constitution (€53,739 [interquartile range, €45,007-€62,471] vs €43,279 [interquartile range, €39,509-€47,049]; P = .001). After confounder adjustment, a low SMI was associated with a 14.68% cost increase in overall hospital costs, for a cost increase of €6521.

Conclusions

Low skeletal muscle mass is independently associated with higher hospital as well as intensive care costs in patients undergoing elective aortic aneurysm repair. Strategies to reduce this risk factor are warranted for these patients.  相似文献   
24.
25.
26.
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