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   3691844篇
  免费   267337篇
  国内免费   6949篇
耳鼻咽喉   50967篇
儿科学   118164篇
妇产科学   97854篇
基础医学   513387篇
口腔科学   105747篇
临床医学   331940篇
内科学   712103篇
皮肤病学   75938篇
神经病学   301523篇
特种医学   144674篇
外国民族医学   1084篇
外科学   559678篇
综合类   86436篇
现状与发展   5篇
一般理论   1397篇
预防医学   294487篇
眼科学   87013篇
药学   271529篇
  11篇
中国医学   8162篇
肿瘤学   204031篇
  2018年   57084篇
  2017年   44059篇
  2016年   49520篇
  2015年   37234篇
  2014年   52387篇
  2013年   78244篇
  2012年   111647篇
  2011年   130040篇
  2010年   82129篇
  2009年   72517篇
  2008年   122291篇
  2007年   131670篇
  2006年   113157篇
  2005年   111440篇
  2004年   108692篇
  2003年   105537篇
  2002年   101553篇
  2001年   167145篇
  2000年   172604篇
  1999年   145037篇
  1998年   41438篇
  1997年   37010篇
  1996年   36520篇
  1995年   35344篇
  1994年   33025篇
  1993年   30575篇
  1992年   114944篇
  1991年   111317篇
  1990年   107436篇
  1989年   103717篇
  1988年   95783篇
  1987年   94094篇
  1986年   88919篇
  1985年   84825篇
  1984年   63877篇
  1983年   54437篇
  1982年   32287篇
  1981年   28797篇
  1979年   58870篇
  1978年   41121篇
  1977年   34916篇
  1976年   32719篇
  1975年   34477篇
  1974年   42462篇
  1973年   40479篇
  1972年   37891篇
  1971年   34991篇
  1970年   32898篇
  1969年   30613篇
  1968年   28107篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Graefe's Archive for Clinical and Experimental Ophthalmology - The published online version contains mistake as the author's first name and last name have been interchanged as "Hild...  相似文献   
5.
6.
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   
7.
Pharmaceutical Chemistry Journal - An HPLC-MS method for simultaneous quantitative determination of a novel gestagenic pharmaceutical and two of its metabolites in rat and rabbit blood sera was...  相似文献   
8.
Gattermann  J. 《Der Onkologe》2020,26(11):1010-1018
Die Onkologie - Die Corona-Pandemie hat in den letzten Monaten verdeutlicht, dass das Thema Sterblichkeit trotz erheblicher Fortschritte im Bereich der Hospiz- und Palliativversorgung zu...  相似文献   
9.
The majority of hip fractures in the elderly are the result of a fall from standing or from a lower height. Current injury models focus mostly on femur strength while neglecting subject-specific loading. This article presents an injury modeling strategy for hip fractures related to sideways falls that takes subject-specific impact loading into account. Finite element models (FEMs) of the human body were used to predict the experienced load and the femoral strength in a single model. We validated these models for their predicted peak force, effective pelvic stiffness, and fracture status against matching ex vivo sideways fall impacts (n = 11) with a trochanter velocity of 3.1 m/s. Furthermore, they were compared to sideways impacts of volunteers with lower impact velocities that were previously conducted by other groups. Good agreement was found between the ex vivo experiments and the FEMs with respect to peak force (root mean square error [RMSE] = 10.7%, R2 = 0.85) and effective pelvic stiffness (R2 = 0.92, RMSE = 12.9%). The FEMs were predictive of the fracture status for 10 out of 11 specimens. Compared to the volunteer experiments from low height, the FEMs overestimated the peak force by 25% for low BMI subjects and 8% for high BMI subjects. The effective pelvic stiffness values that were derived from the FEMs were comparable to those derived from impacts with volunteers. The force attenuation from the impact surface to the femur ranged between 27% and 54% and was highly dependent on soft tissue thickness (R2 = 0.86). The energy balance in the FEMS showed that at the time of peak force 79% to 93% of the total energy is either kinetic or was transformed to soft tissue deformation. The presented FEMs allow for direct discrimination between fracture and nonfracture outcome for sideways falls and bridge the gap between impact testing with volunteers and impact conditions representative of real life falls. © 2019 American Society for Bone and Mineral Research.  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