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   253074篇
  免费   17879篇
  国内免费   1135篇
耳鼻咽喉   2794篇
儿科学   6518篇
妇产科学   4610篇
基础医学   33092篇
口腔科学   4565篇
临床医学   25482篇
内科学   53752篇
皮肤病学   3398篇
神经病学   24370篇
特种医学   8419篇
外国民族医学   11篇
外科学   38555篇
综合类   3489篇
一般理论   320篇
预防医学   21511篇
眼科学   6566篇
药学   17037篇
  6篇
中国医学   361篇
肿瘤学   17232篇
  2023年   1349篇
  2022年   2415篇
  2021年   5443篇
  2020年   3275篇
  2019年   5316篇
  2018年   5985篇
  2017年   4486篇
  2016年   4975篇
  2015年   5851篇
  2014年   8630篇
  2013年   11838篇
  2012年   18056篇
  2011年   18958篇
  2010年   10604篇
  2009年   9453篇
  2008年   16630篇
  2007年   17490篇
  2006年   17345篇
  2005年   17347篇
  2004年   16225篇
  2003年   15066篇
  2002年   14083篇
  2001年   2143篇
  2000年   1638篇
  1999年   2357篇
  1998年   3080篇
  1997年   2567篇
  1996年   2192篇
  1995年   2105篇
  1994年   1746篇
  1993年   1577篇
  1992年   1275篇
  1991年   1181篇
  1990年   1019篇
  1989年   996篇
  1988年   990篇
  1987年   964篇
  1986年   967篇
  1985年   983篇
  1984年   1226篇
  1983年   1136篇
  1982年   1371篇
  1981年   1321篇
  1980年   1147篇
  1979年   711篇
  1978年   757篇
  1977年   637篇
  1976年   592篇
  1975年   470篇
  1974年   474篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
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   
8.
9.
Prevalence of osteoporosis is more than 50% in older adults, yet current clinical methods for diagnosis that rely on areal bone mineral density (aBMD) fail to detect most individuals who have a fragility fracture. Bone fragility can manifest in different forms, and a “one-size-fits-all” approach to diagnosis and management of osteoporosis may not be suitable. High-resolution peripheral quantitative computed tomography (HR-pQCT) provides additive information by capturing information about volumetric density and microarchitecture, but interpretation is challenging because of the complex interactions between the numerous properties measured. In this study, we propose that there are common combinations of bone properties, referred to as phenotypes, that are predisposed to different levels of fracture risk. Using HR-pQCT data from a multinational cohort (n = 5873, 71% female) between 40 and 96 years of age, we employed fuzzy c-means clustering, an unsupervised machine-learning method, to identify phenotypes of bone microarchitecture. Three clusters were identified, and using partial correlation analysis of HR-pQCT parameters, we characterized the clusters as low density, low volume, and healthy bone phenotypes. Most males were associated with the healthy bone phenotype, whereas females were more often associated with the low volume or low density bone phenotypes. Each phenotype had a significantly different cumulative hazard of major osteoporotic fracture (MOF) and of any incident osteoporotic fracture (p < 0.05). After adjustment for covariates (cohort, sex, and age), the low density followed by the low volume phenotype had the highest association with MOF (hazard ratio = 2.96 and 2.35, respectively), and significant associations were maintained when additionally adjusted for femoral neck aBMD (hazard ratio = 1.69 and 1.90, respectively). Further, within each phenotype, different imaging biomarkers of fracture were identified. These findings suggest that osteoporotic fracture risk is associated with bone phenotypes that capture key features of bone deterioration that are not distinguishable by aBMD. © 2021 American Society for Bone and Mineral Research (ASBMR).  相似文献   
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