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   3439212篇
  免费   245045篇
  国内免费   8779篇
耳鼻咽喉   47360篇
儿科学   114511篇
妇产科学   95911篇
基础医学   485303篇
口腔科学   94822篇
临床医学   308092篇
内科学   673723篇
皮肤病学   79448篇
神经病学   280175篇
特种医学   133744篇
外国民族医学   1047篇
外科学   520734篇
综合类   69955篇
现状与发展   6篇
一般理论   1192篇
预防医学   263853篇
眼科学   77591篇
药学   252620篇
  9篇
中国医学   6801篇
肿瘤学   186139篇
  2018年   43383篇
  2017年   33447篇
  2016年   39015篇
  2015年   36362篇
  2014年   49905篇
  2013年   75237篇
  2012年   102083篇
  2011年   112778篇
  2010年   69461篇
  2009年   64955篇
  2008年   106595篇
  2007年   114693篇
  2006年   108734篇
  2005年   105912篇
  2004年   102404篇
  2003年   99839篇
  2002年   96102篇
  2001年   158214篇
  2000年   162259篇
  1999年   137060篇
  1998年   39874篇
  1997年   35432篇
  1996年   35596篇
  1995年   34281篇
  1994年   31756篇
  1993年   29770篇
  1992年   108091篇
  1991年   104789篇
  1990年   102028篇
  1989年   98851篇
  1988年   91052篇
  1987年   89397篇
  1986年   84333篇
  1985年   80612篇
  1984年   59871篇
  1983年   51420篇
  1982年   30663篇
  1981年   27192篇
  1979年   54334篇
  1978年   38342篇
  1977年   32838篇
  1976年   30621篇
  1975年   33007篇
  1974年   38882篇
  1973年   37104篇
  1972年   35175篇
  1971年   32576篇
  1970年   30412篇
  1969年   29200篇
  1968年   27064篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
31.
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   
32.
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   
33.
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   
34.
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   
35.
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   
36.
37.
Introduction: The Hedgehog (HH) pathway constitutes a collection of signaling molecules which critically influence embryogenesis. In adults, however, the HH pathway remains integral to the proliferation, maintenance, and apoptosis of adult stem cells including hematopoietic stem cells.

Areas covered: We discuss the current understanding of the HH pathway as it relates to normal hematopoiesis, the pathology of acute myeloid leukemia (AML), the rationale for and data from combination therapies including HH pathway inhibitors, and ultimately the prospects that might offer promise in targeting this pathway in AML.

Expert opinion: Efforts to target the HH pathway have been focused on impeding this disposition and restoring chemosensitivity to conventional myeloid neoplasm therapies. The year 2018 saw the first approval of a HH pathway inhibitor (glasdegib) for AML, though for an older population and in combination with an uncommonly-used therapy. Several other clinical trials with agents targeting modulators of HH signaling in AML and MDS are underway. Further study and understanding of the interplay between the numerous aspects of HH signaling and how it relates to the augmented survival of AML will provide a more reliable substrate for therapeutic strategies in patients with this poor-risk disease.  相似文献   

38.
39.
40.
We review the spectrum of cutaneous disorders associated with inflammatory and neoplastic plasmacytic pathology. Because plasma cells are derived from B‐lymphocytes our overview includes discussion of certain lymphoplasmacytic proliferations. It is structured along histopathological lines, addressing conditions characterized by (a) cutaneous plasma cell infiltrates, (b) deposits of plasma cell products or their derivatives in the skin and (c) miscellaneous, poorly understood cutaneous complications of plasmacytic disorders. Lesions arising primarily in the skin and those due to cutaneous involvement by multisystem disorders are addressed. The range includes a spectrum of tumefactive and circulatory manifestations. We highlight key clinical and pathological features of the different conditions and outline recent advances in our understanding of these entities. By emphasizing the dermatopathological characteristics of this spectrum of disorders we hope to hone the diagnostic accuracy of practitioners in the field.  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