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   77961篇
  免费   6535篇
  国内免费   98篇
耳鼻咽喉   825篇
儿科学   2453篇
妇产科学   1997篇
基础医学   10112篇
口腔科学   1465篇
临床医学   9533篇
内科学   14379篇
皮肤病学   1145篇
神经病学   8353篇
特种医学   2546篇
外国民族医学   8篇
外科学   9193篇
综合类   1066篇
一般理论   79篇
预防医学   8879篇
眼科学   1675篇
药学   5287篇
  2篇
中国医学   76篇
肿瘤学   5521篇
  2022年   622篇
  2021年   1673篇
  2020年   976篇
  2019年   1570篇
  2018年   1775篇
  2017年   1371篇
  2016年   1510篇
  2015年   1627篇
  2014年   2171篇
  2013年   3207篇
  2012年   4615篇
  2011年   4934篇
  2010年   2637篇
  2009年   2278篇
  2008年   4151篇
  2007年   4368篇
  2006年   4053篇
  2005年   3816篇
  2004年   3579篇
  2003年   3212篇
  2002年   3266篇
  2001年   1726篇
  2000年   1716篇
  1999年   1558篇
  1998年   823篇
  1997年   727篇
  1996年   631篇
  1995年   627篇
  1994年   527篇
  1993年   461篇
  1992年   1223篇
  1991年   1210篇
  1990年   1138篇
  1989年   1123篇
  1988年   939篇
  1987年   1057篇
  1986年   982篇
  1985年   973篇
  1984年   777篇
  1983年   644篇
  1982年   414篇
  1981年   382篇
  1979年   702篇
  1978年   526篇
  1977年   448篇
  1976年   459篇
  1975年   395篇
  1974年   523篇
  1973年   459篇
  1972年   386篇
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
1.
Bundesgesundheitsblatt - Gesundheitsforschung - Gesundheitsschutz - Akteure der öffentlichen Gesundheit (Public Health) tragen wesentlich zu Gesundheitsschutz, -förderung und...  相似文献   
2.
3.
Despite orientation and mobility (O&M) being a significant factor determining quality of life of people with low vision or blindness, there are no gold standard measures or agreement on how to measure O&M performance. In the first part of this systematic review, an inventory of O&M outcome measures used by recent studies to assess the performance of orientation and/or mobility of adults with vision impairment (low vision and blindness) is presented. A wide variety of O&M outcome measures have been implemented in different fields of study, such as epidemiologic research and interventional studies evaluating training, assistive technology, vision rehabilitation and vision restoration. The most frequent aspect of outcome measures is efficiency such as time, distance, speed and percentage of preferred walking speed, followed by obstacle contacts and avoidance, and dis/orientation and veering. Other less commonly used aspects are target identification, safety and social interaction and self-reported outcome measures. Some studies employ sophisticated equipment to capture and analyse O&M performance in a laboratory setting, while others carry out their assessment in real-world indoor or outdoor environments. In the second part of this review, the appropriateness of implementing the identified outcome measures to assess O&M performance in clinical and functional O&M practice is evaluated. Nearly a half of these outcome measures meet all four criteria of face validity (either clinical or functional), responsiveness, reliability and feasibility and have the potential to be implemented in clinical or functional O&M practice. The findings of this review confirm the complicated and dynamic nature of O&M. Multiple measures are required in any evaluation of O&M performance to facilitate holistic assessment of O&M abilities and limitations of each individual.  相似文献   
4.
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia.  相似文献   
5.
6.
Metabolism describes the series of chemical reactions that are concerned with the provision of energy to biological systems. They may be divided into reactions involved in energy yield (catabolism: demand exceeds supply), and energy storage (anabolism: supply exceeds demand). Regulation of these pathways is critical for homeostasis, and derangements in metabolism are seen in a wide variety of pathological processes. Understanding metabolism is key to the treatment of many diseases, notably diabetes, as well as underpinning clinical nutritional support.  相似文献   
7.
8.
9.
10.
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