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   2362758篇
  免费   189226篇
  国内免费   7323篇
耳鼻咽喉   30617篇
儿科学   77064篇
妇产科学   65450篇
基础医学   337829篇
口腔科学   65803篇
临床医学   219496篇
内科学   471056篇
皮肤病学   54061篇
神经病学   193225篇
特种医学   92492篇
外国民族医学   523篇
外科学   352000篇
综合类   53052篇
现状与发展   5篇
一般理论   950篇
预防医学   195518篇
眼科学   52173篇
药学   169724篇
  9篇
中国医学   3939篇
肿瘤学   124321篇
  2018年   24516篇
  2016年   22088篇
  2015年   24921篇
  2014年   34681篇
  2013年   52786篇
  2012年   67698篇
  2011年   72577篇
  2010年   43812篇
  2009年   42355篇
  2008年   68228篇
  2007年   72907篇
  2006年   73446篇
  2005年   71514篇
  2004年   68398篇
  2003年   66076篇
  2002年   63578篇
  2001年   107105篇
  2000年   109784篇
  1999年   92344篇
  1998年   27633篇
  1997年   24857篇
  1996年   25834篇
  1995年   25401篇
  1994年   23602篇
  1993年   22215篇
  1992年   75796篇
  1991年   74107篇
  1990年   71686篇
  1989年   68722篇
  1988年   63773篇
  1987年   62738篇
  1986年   59327篇
  1985年   56982篇
  1984年   43415篇
  1983年   37303篇
  1982年   23005篇
  1981年   20763篇
  1980年   19567篇
  1979年   40367篇
  1978年   29525篇
  1977年   24880篇
  1976年   22869篇
  1975年   24346篇
  1974年   29134篇
  1973年   28266篇
  1972年   26396篇
  1971年   24529篇
  1970年   22767篇
  1969年   21410篇
  1968年   19990篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
72.
73.
74.
75.
76.
77.
78.
The current situation in which the humanities are disparaged affects all university disciplines, including nursing, in whose historical evolution the humanities have always been present in one form or another. Looking beyond this disrepute, this study proposes that nursing renew its attention to classical philosophy. Specifically, it invites a close reading of Xenophon's Anabasis and Plato's Meno, to get three related goals: to show how the use of ancient texts are very valuable tools for the philosophical initiation of nursing students and can help them reflect on their choice of nursing as a practical activity; to reflect on the problem of virtue and the nature of the good life; and to show how the interaction with ancient texts allows students to reflect on questions and issues of life, theirs and others, that are not open to investigation through a purely scientific method. Consequently, both Anabasis and Meno readings strengthen the intellectual relationship between philosophy and nursing, enabling the latter to delve deeper into the key questions of its own thought as a discipline.  相似文献   
79.
Obesity Surgery - Laparoscopic sleeve gastrectomy (LSG) is increasingly playing a key role in obesity management. Such operations, however, carry complications sometimes including leaks. The...  相似文献   
80.
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   
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