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   3381759篇
  免费   239094篇
  国内免费   8790篇
耳鼻咽喉   46865篇
儿科学   112192篇
妇产科学   94934篇
基础医学   478223篇
口腔科学   94457篇
临床医学   304024篇
内科学   660478篇
皮肤病学   79137篇
神经病学   273829篇
特种医学   130889篇
外国民族医学   1047篇
外科学   510101篇
综合类   69458篇
现状与发展   6篇
一般理论   1193篇
预防医学   258143篇
眼科学   76922篇
药学   249396篇
  9篇
中国医学   6797篇
肿瘤学   181543篇
  2018年   36135篇
  2017年   27608篇
  2016年   31945篇
  2015年   36103篇
  2014年   49729篇
  2013年   75087篇
  2012年   100028篇
  2011年   106187篇
  2010年   63955篇
  2009年   61154篇
  2008年   99910篇
  2007年   106595篇
  2006年   108578篇
  2005年   104484篇
  2004年   100659篇
  2003年   97440篇
  2002年   94576篇
  2001年   158026篇
  2000年   161943篇
  1999年   136935篇
  1998年   39744篇
  1997年   35255篇
  1996年   35508篇
  1995年   34174篇
  1994年   31628篇
  1993年   29671篇
  1992年   108018篇
  1991年   104688篇
  1990年   101933篇
  1989年   98774篇
  1988年   90977篇
  1987年   89322篇
  1986年   84273篇
  1985年   80538篇
  1984年   59835篇
  1983年   51378篇
  1982年   30603篇
  1981年   27185篇
  1979年   54266篇
  1978年   38297篇
  1977年   32826篇
  1976年   30584篇
  1975年   33006篇
  1974年   38868篇
  1973年   37098篇
  1972年   35176篇
  1971年   32577篇
  1970年   30394篇
  1969年   29177篇
  1968年   27048篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
European Surgery - Treatment of pilonidal sinus disease (PSD) requires a tailored approach. A national guideline was published in 2014. The current status of surgical PSD therapy...  相似文献   
22.
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   
23.
Journal of Neuro-Oncology - Adjuvant radiation is often used in patients with low grade gliomas with high-risk characteristics with a recommended dose of 45–54 Gy. We used the...  相似文献   
24.
Maternal and Child Health Journal - Early life exposures can have an impact on a child’s developmental trajectory and children born late preterm (34–36 weeks gestational age)...  相似文献   
25.
Troppmair  Teresa  Egger  J.  Krösbacher  A.  Zanvettor  A.  Schinnerl  A.  Neumayr  A.  Baubin  M. 《Der Anaesthesist》2022,71(4):272-280
Die Anaesthesiologie - Die Qualität eines Rettungssystems zeichnet sich auch durch den effizienten Einsatz seiner personellen und Fahrzeugressourcen aus. So können im berechtigten Fall...  相似文献   
26.
27.
28.
29.
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   
30.
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