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   2587964篇
  免费   184527篇
  国内免费   7566篇
耳鼻咽喉   34272篇
儿科学   85196篇
妇产科学   71570篇
基础医学   363645篇
口腔科学   69652篇
临床医学   234504篇
内科学   515504篇
皮肤病学   62450篇
神经病学   213445篇
特种医学   99880篇
外国民族医学   736篇
外科学   386416篇
综合类   50394篇
现状与发展   5篇
一般理论   968篇
预防医学   196191篇
眼科学   56673篇
药学   187994篇
  8篇
中国医学   5332篇
肿瘤学   145222篇
  2021年   19977篇
  2019年   20623篇
  2018年   29289篇
  2017年   22597篇
  2016年   26230篇
  2015年   29509篇
  2014年   40444篇
  2013年   60434篇
  2012年   80236篇
  2011年   84495篇
  2010年   51009篇
  2009年   49152篇
  2008年   79019篇
  2007年   83842篇
  2006年   85566篇
  2005年   81725篇
  2004年   78722篇
  2003年   76041篇
  2002年   73327篇
  2001年   128408篇
  2000年   131331篇
  1999年   110499篇
  1998年   31253篇
  1997年   27920篇
  1996年   28217篇
  1995年   27385篇
  1994年   25067篇
  1993年   23419篇
  1992年   85161篇
  1991年   81565篇
  1990年   78786篇
  1989年   76061篇
  1988年   69468篇
  1987年   67998篇
  1986年   63544篇
  1985年   60513篇
  1984年   44943篇
  1983年   37946篇
  1982年   22461篇
  1981年   19985篇
  1979年   38962篇
  1978年   27440篇
  1977年   23254篇
  1976年   21496篇
  1975年   22820篇
  1974年   26788篇
  1973年   25370篇
  1972年   23750篇
  1971年   21957篇
  1970年   20183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.
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   
29.
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