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   2766293篇
  免费   199357篇
  国内免费   7715篇
耳鼻咽喉   37327篇
儿科学   91941篇
妇产科学   77003篇
基础医学   391195篇
口腔科学   74919篇
临床医学   249965篇
内科学   547470篇
皮肤病学   66497篇
神经病学   226348篇
特种医学   106945篇
外国民族医学   768篇
外科学   415142篇
综合类   55650篇
现状与发展   6篇
一般理论   1098篇
预防医学   209532篇
眼科学   61475篇
药学   201382篇
  8篇
中国医学   5801篇
肿瘤学   152893篇
  2019年   21931篇
  2018年   31336篇
  2017年   24046篇
  2016年   27942篇
  2015年   31432篇
  2014年   43059篇
  2013年   64771篇
  2012年   85450篇
  2011年   90052篇
  2010年   54702篇
  2009年   52369篇
  2008年   84077篇
  2007年   89411篇
  2006年   91096篇
  2005年   87028篇
  2004年   83887篇
  2003年   80957篇
  2002年   77928篇
  2001年   135214篇
  2000年   138379篇
  1999年   116478篇
  1998年   32998篇
  1997年   29508篇
  1996年   29687篇
  1995年   28782篇
  1994年   26403篇
  1993年   24703篇
  1992年   89891篇
  1991年   86482篇
  1990年   83742篇
  1989年   80930篇
  1988年   74037篇
  1987年   72415篇
  1986年   67743篇
  1985年   64647篇
  1984年   48011篇
  1983年   40581篇
  1982年   24105篇
  1981年   21378篇
  1979年   42072篇
  1978年   29691篇
  1977年   25219篇
  1976年   23235篇
  1975年   24853篇
  1974年   29274篇
  1973年   27909篇
  1972年   26165篇
  1971年   24194篇
  1970年   22363篇
  1969年   21425篇
排序方式: 共有10000条查询结果,搜索用时 15 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