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   1278890篇
  免费   97811篇
  国内免费   1990篇
耳鼻咽喉   18423篇
儿科学   44360篇
妇产科学   35012篇
基础医学   182219篇
口腔科学   33594篇
临床医学   111255篇
内科学   258226篇
皮肤病学   28023篇
神经病学   100373篇
特种医学   51206篇
外国民族医学   660篇
外科学   196391篇
综合类   27048篇
现状与发展   1篇
一般理论   377篇
预防医学   95757篇
眼科学   27912篇
药学   94774篇
  2篇
中国医学   2422篇
肿瘤学   70656篇
  2018年   13137篇
  2017年   9968篇
  2016年   10901篇
  2015年   12373篇
  2014年   17171篇
  2013年   26216篇
  2012年   36025篇
  2011年   38055篇
  2010年   22805篇
  2009年   21815篇
  2008年   36639篇
  2007年   39247篇
  2006年   39505篇
  2005年   38444篇
  2004年   37593篇
  2003年   36447篇
  2002年   35796篇
  2001年   63989篇
  2000年   66498篇
  1999年   56409篇
  1998年   15128篇
  1997年   13755篇
  1996年   14195篇
  1995年   13459篇
  1994年   12769篇
  1993年   11792篇
  1992年   44559篇
  1991年   43468篇
  1990年   42218篇
  1989年   40116篇
  1988年   36896篇
  1987年   36234篇
  1986年   33623篇
  1985年   32281篇
  1984年   24139篇
  1983年   20272篇
  1982年   11727篇
  1981年   10694篇
  1980年   9521篇
  1979年   21345篇
  1978年   14830篇
  1977年   12536篇
  1976年   11694篇
  1975年   12624篇
  1974年   14663篇
  1973年   14127篇
  1972年   12947篇
  1971年   11735篇
  1970年   11053篇
  1969年   10026篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Molnár  B.  Aroca  S.  Dobos  A.  Orbán  K.  Szabó  J.  Windisch  P.  Stähli  A.  Sculean  A. 《Clinical oral investigations》2022,26(12):7135-7142
Clinical Oral Investigations - To evaluate t he long-term outcomes following treatment of RT 1 multiple adjacent gingival recessions (MAGR) using the modified coronally advanced tunnel (MCAT) with...  相似文献   
2.
3.
4.
5.
6.
In this paper we present a coupled Finite Element Method – Boundary Element Method (FEM-BEM) approach for the solution of the free-boundary axi-symmetric plasma equilibrium problem. The proposed method, obtained from an improvement of the Hagenow-Lackner coupling method, allows to efficiently model the equilibrium problem in unbounded domains by discretizing only the plasma region; the external conductors can be modelled either as 2D or 3D models, according to the problem of interest. The paper explores different iterative methods for the solution of the nonlinear Grad-Shafranov equation, such as Picard, Newton-Raphson and Newton-Krylov, in order to provide a robust and reliable tool, able to handle large-scale problems (e.g. high resolution equilibria). This method has been implemented in the FRIDA code (FRee-boundary Integro-Differential Axisimmetric – https://github. om/matteobonotto/ FRIDA), together with a suitable Adaptive Integration Technique (AIT) for the computation of the source term. FRIDA has been successfully tested and validated against experimental data from RFX-mod device, and numerical equilibria of an ITER-like device.  相似文献   
7.
8.
9.
10.
BackgroundThe aim of this study was to estimate the prevalence of dental prosthetic treatment and to investigate the demographic, social, economic and medical factors associated with the use of fixed and removable dentures in a representative sample of adults living in France.MethodsThe data were obtained from the 2002–2003 Decennial Health Survey, a cross-sectional study of a representative sample of the population living in France, which included 29,679 adults. Information was collected by interview. The variables collected were fixed denture, removable denture, age, gender, number of children, area of residence, nationality, educational attainment, family social status, employment status, annual household income per capita, supplementary insurance, chronic disease, eyesight problems/glasses, hearing problems/hearing aids. Multinomial logistic regression models were used to study the relationship between prosthetic treatment and demographic, socioeconomic and medical characteristics unadjusted, adjusted for age and adjusted for all the characteristics.ResultsThe prevalence of prosthetic treatment was 34.6% (95% confidence interval (CI): [34.1; 35.2]) for fixed prosthetic dentures and 13.8% (95% CI: [13.4; 14.2]) for removable prosthetic dentures. We showed a gradient between educational attainment and removable dentures; the odds ratio adjusted for all the variables (aOR) associated with no or primary education compared to post-secondary education was 2.56; 95% CI: [2.09; 3.13]. When annual household income per capita was low, subjects were less likely to report fixed dentures (aOR = 0.68; 95% CI: [0.62; 0.75]) than those with high annual household income per capita. Individuals without insurance less often reported fixed dentures than those with private insurance. Those reporting chronic disease were less likely to report fixed dentures (aOR = 0.87; 95% CI: [0.79; 0.95]) but more likely to report removable dentures (aOR = 1.29; 95% CI: [1.17; 1.43]) than those without chronic disease.ConclusionThis study reveals social, economic and medical inequalities in fixed and removable prosthetic treatment among adults in France.  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