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   1285322篇
  免费   98209篇
  国内免费   2020篇
耳鼻咽喉   18477篇
儿科学   44625篇
妇产科学   35154篇
基础医学   183193篇
口腔科学   33763篇
临床医学   111926篇
内科学   259404篇
皮肤病学   28104篇
神经病学   101059篇
特种医学   51523篇
外国民族医学   660篇
外科学   197394篇
综合类   27089篇
现状与发展   1篇
一般理论   379篇
预防医学   96194篇
眼科学   28004篇
药学   95134篇
  2篇
中国医学   2443篇
肿瘤学   71023篇
  2018年   13249篇
  2017年   10043篇
  2016年   10991篇
  2015年   12470篇
  2014年   17310篇
  2013年   26427篇
  2012年   36341篇
  2011年   38384篇
  2010年   22973篇
  2009年   21966篇
  2008年   36910篇
  2007年   39516篇
  2006年   39801篇
  2005年   38752篇
  2004年   37897篇
  2003年   36749篇
  2002年   36041篇
  2001年   64177篇
  2000年   66703篇
  1999年   56595篇
  1998年   15208篇
  1997年   13828篇
  1996年   14254篇
  1995年   13491篇
  1994年   12808篇
  1993年   11846篇
  1992年   44694篇
  1991年   43596篇
  1990年   42346篇
  1989年   40234篇
  1988年   36997篇
  1987年   36336篇
  1986年   33709篇
  1985年   32393篇
  1984年   24220篇
  1983年   20332篇
  1982年   11770篇
  1981年   10736篇
  1980年   9543篇
  1979年   21400篇
  1978年   14888篇
  1977年   12568篇
  1976年   11737篇
  1975年   12667篇
  1974年   14709篇
  1973年   14167篇
  1972年   12994篇
  1971年   11779篇
  1970年   11091篇
  1969年   10059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