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   63398篇
  免费   6951篇
  国内免费   4513篇
耳鼻咽喉   720篇
儿科学   805篇
妇产科学   734篇
基础医学   5895篇
口腔科学   1452篇
临床医学   7915篇
内科学   7982篇
皮肤病学   566篇
神经病学   2446篇
特种医学   2426篇
外国民族医学   21篇
外科学   6278篇
综合类   14090篇
现状与发展   12篇
一般理论   3篇
预防医学   5342篇
眼科学   1335篇
药学   7581篇
  101篇
中国医学   4819篇
肿瘤学   4339篇
  2024年   307篇
  2023年   1140篇
  2022年   2769篇
  2021年   3729篇
  2020年   2841篇
  2019年   2082篇
  2018年   2139篇
  2017年   2196篇
  2016年   1944篇
  2015年   3129篇
  2014年   3828篇
  2013年   3898篇
  2012年   5460篇
  2011年   5717篇
  2010年   4365篇
  2009年   3776篇
  2008年   3989篇
  2007年   3931篇
  2006年   3497篇
  2005年   2896篇
  2004年   2287篇
  2003年   2113篇
  2002年   1793篇
  2001年   1319篇
  2000年   961篇
  1999年   649篇
  1998年   373篇
  1997年   353篇
  1996年   249篇
  1995年   220篇
  1994年   204篇
  1993年   113篇
  1992年   114篇
  1991年   89篇
  1990年   109篇
  1989年   75篇
  1988年   48篇
  1987年   50篇
  1986年   36篇
  1985年   21篇
  1984年   17篇
  1983年   13篇
  1981年   5篇
  1980年   2篇
  1979年   4篇
  1977年   2篇
  1974年   2篇
  1959年   1篇
  1936年   1篇
  1904年   1篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
综述信息化技术在静脉血栓栓塞症护理领域中风险预测、警报接收与上报、抗凝防治管理、医护人员相关继续医学教育、患者疾病预后管理的应用现状,总结其应用阻碍因素,旨在为我国静脉血栓栓塞症护理信息化建设提供参考。  相似文献   
2.
3.
Abstract

Objective

Ras wild-type metastatic colorectal cancers (mCRC) may be treated with anti-vascular endothelial growth factor (VEGF) or anti-epidermal growth factor receptor (EGFR) agents. We aim to estimate patients’ preferences for mCRC treatment and relative importance of cost, efficacy improvement, avoidance of side effects and therapy convenience, and relative uptake between profiles that resemble Bevacizumab (anti-VEGF) and Cetuximab (anti-EGFR), two commonly prescribed mCRC targeted therapies.  相似文献   
4.
A comparative study involving bimetallic nickel catalysts designed from disubstituted N,N,N′,N′‐tetra(diphenylphosphanylmethyl)benzene diamine bridging ligands is reported. Catalyst behavior is explored in the Kumada catalyst‐transfer polymerization (KCTP) using poly(3‐hexylthiophene) (P3HT) as the model system. The success of a controlled polymerization is monitored by analyzing monomer conversion, degree of polymerization, end‐group identity, and molecular weight distribution. The characterization of P3HT obtained from KCTP initiated with the bimetallic catalysts shows chain‐growth behavior; however, the presence of Br/Br end‐groups and broader molecular weight distribution reveals a reduced controlled polymerization compared to the commonly employed Ni(dppp)Cl2. The observed increase in intermolecular chain transfer and termination processes in KCTP initiation with the bimetallic catalysts can be attributed to a weaker Ni(0)‐π‐aryl complex interaction, which is caused by increased steric crowding of the coordination sphere.  相似文献   
5.
6.
7.
8.
9.
10.
Patients with mechanic ankle instability experience increased tibiotalar and subtalar joint laxity. However, in vivo joint kinematics in functional ankle instability (FAI) patients and lateral ankle sprain (LAS) copers, especially during dynamic activities, are poorly understood. Ten FAI patients, 10 LAS copers, and 10 healthy controls were included in this study. A dual fluoroscopic imaging system was used to analyze the tibiotalar and subtalar joint kinematics during stair descent. Five key poses of stair descent were analyzed. Kinematic data from six degrees of freedom were calculated utilizing a solid modeling software. The range of motion and joint positions in each degree of freedom were compared among the three groups. The tibiotalar joints of FAI patients and LAS copers were significantly more inverted than those of healthy controls during the foot strike (p = 0.016, = 0.264). The subtalar joints of FAI patients were significantly more anteriorly translated (pose 2, p = 0.003, = 0.352; pose 3, p < 0.001, = 0.454; pose 4, p = 0.004, = 0.334), inverted (pose 4, p = 0.027, = 0.234; pose 5,p = 0.034, = 0.221), and externally rotated (pose 4, p = 0.037, = 0.217; pose 5; p = 0.004, = 0.331) than those of healthy controls during the mid‐stance and the heel off. The FAI patients showed excessive tibiotalar inversion and subtalar joint hypermobility during stair descent. Meanwhile, the LAS copers maintained subtalar joint stability, and only showed excessive tibiotalar inversion in foot strike. These data provide insight into the mechanisms behind the development of FAI after initial LAS. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:1860–1867, 2019  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