全文获取类型
收费全文 | 2955762篇 |
免费 | 217325篇 |
国内免费 | 4939篇 |
专业分类
耳鼻咽喉 | 41443篇 |
儿科学 | 95537篇 |
妇产科学 | 81406篇 |
基础医学 | 432387篇 |
口腔科学 | 82126篇 |
临床医学 | 264339篇 |
内科学 | 570854篇 |
皮肤病学 | 64910篇 |
神经病学 | 235239篇 |
特种医学 | 112908篇 |
外国民族医学 | 813篇 |
外科学 | 449069篇 |
综合类 | 61698篇 |
现状与发展 | 12篇 |
一般理论 | 1118篇 |
预防医学 | 231307篇 |
眼科学 | 69125篇 |
药学 | 219060篇 |
9篇 | |
中国医学 | 5696篇 |
肿瘤学 | 158970篇 |
出版年
2019年 | 24308篇 |
2018年 | 33455篇 |
2017年 | 25516篇 |
2016年 | 28359篇 |
2015年 | 32034篇 |
2014年 | 45404篇 |
2013年 | 68124篇 |
2012年 | 93813篇 |
2011年 | 99698篇 |
2010年 | 59268篇 |
2009年 | 56224篇 |
2008年 | 93753篇 |
2007年 | 99628篇 |
2006年 | 100613篇 |
2005年 | 97542篇 |
2004年 | 92945篇 |
2003年 | 89466篇 |
2002年 | 86922篇 |
2001年 | 132840篇 |
2000年 | 136137篇 |
1999年 | 114590篇 |
1998年 | 31688篇 |
1997年 | 27724篇 |
1996年 | 27876篇 |
1995年 | 28007篇 |
1994年 | 25989篇 |
1993年 | 24520篇 |
1992年 | 89590篇 |
1991年 | 87093篇 |
1990年 | 85232篇 |
1989年 | 82055篇 |
1988年 | 75645篇 |
1987年 | 74303篇 |
1986年 | 69997篇 |
1985年 | 67027篇 |
1984年 | 50074篇 |
1983年 | 42652篇 |
1982年 | 25415篇 |
1979年 | 46125篇 |
1978年 | 32808篇 |
1977年 | 27325篇 |
1976年 | 26055篇 |
1975年 | 28196篇 |
1974年 | 34011篇 |
1973年 | 32531篇 |
1972年 | 30537篇 |
1971年 | 28740篇 |
1970年 | 26762篇 |
1969年 | 25330篇 |
1968年 | 23550篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Two-year results after combined phacoemulsification and iris-fixated phakic intraocular lens removal
Gaurisankar Zoraida Solaiga van Rijn Gwyneth A. Cheng Yanny Y. Y. Luyten Gregorius P. M. Beenakker Jan-Willem M. 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2022,260(4):1367-1375
Graefe's Archive for Clinical and Experimental Ophthalmology - To describe and present results after a technique for cataract surgery combined with explantation of an iris-fixated phakic... 相似文献
42.
43.
Paulmurugan Ramasamy Malhotra Meenakshi Massoud Zahra T. Massoud Tarik F. 《Journal of molecular medicine (Berlin, Germany)》2022,100(7):1093-1093
Journal of Molecular Medicine - 相似文献
44.
45.
A Coupled FEM-BEM Approach for the Solution of the Free-Boundary Axi-Symmetric Plasma Equilibrium Problem 下载免费PDF全文
M. Bonotto D. Abate P. Bettini & F. Villone 《Communications In Computational Physics》2022,31(1):27-59
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
46.
Hassen Lena M. Albarrak Rana A. Albahlal Reem A. Alsaqabi Dimah K. Hassen Ikhlass M. Daghestani Maha H. Alqurtas Eman M. Alkhalaf Abdulaziz T. Bedaiwi Mohammed K. Omair Mohammed A. Almaghlouth Ibrahim A. 《Quality of life research》2022,31(11):3229-3239
Quality of Life Research - The COVID-19 pandemic might add to the stressors experienced by people living with rheumatic diseases. This study aimed to examine rheumatic patients’ functional... 相似文献
47.
Michels Guido Horn Rudolf Helfen Andreas Hagendorff Andreas Jung Christian Hoffmann Beatrice Jaspers Natalie Kinkel Horst Greim Clemens-Alexander Knebel Fabian Bauersachs Johann Busch Hans-Jörg Kiefl Daniel Spiel Alexander O. Marx Gernot Dietrich Christoph F. 《Der Anaesthesist》2022,71(4):307-310
Die Anaesthesiologie - 相似文献
48.
Kinase alterations are increasingly recognised as oncogenic drivers in mesenchymal tumours. Infantile fibrosarcoma and the related renal tumour, congenital mesoblastic nephroma, were among the first solid tumours shown to harbour recurrent tyrosine kinase fusions, with the canonical ETV6::NTRK3 fusion identified more than 20 years ago. Although targeted testing has long been used in diagnosis, the advent of more robust sequencing techniques has driven the discovery of kinase alterations in an array of mesenchymal tumours. As our ability to identify these genetic alterations has improved, as has our recognition and understanding of the tumours that harbour these alterations. Specifically, this study will focus upon mesenchymal tumours harbouring NTRK or other kinase alterations, including tumours with an infantile fibrosarcoma-like appearance, spindle cell tumours resembling lipofibromatosis or peripheral nerve sheath tumours and those occurring in adults with a fibrosarcoma-like appearance. As publications describing the histology of these tumours increase so, too, do the variety kinase alterations reported, now including NTRK1/2/3, RET, MET, RAF1, BRAF, ALK, EGFR and ABL1 fusions or alterations. To date, these tumours appear locally aggressive and rarely metastatic, without a clear link between traditional features used in histological grading (e.g. mitotic activity, necrosis) and outcome. However, most of these tumours are amenable to new targeted therapies, making their recognition of both diagnostic and therapeutic import. The goal of this study is to review the clinicopathological features of tumours with NTRK and other tyrosine kinase alterations, discuss the most common differential diagnoses and provide recommendations for molecular confirmation with associated treatment implications. 相似文献
49.
Lykov A. P. Uvarov I. P. Gevorgiz R. G. Zheleznova S. N. 《Bulletin of experimental biology and medicine》2022,172(3):301-304
Bulletin of Experimental Biology and Medicine - We studied the effect of microalgae of various systematic groups added to the ration on the biochemical parameters of blood serum and liver and... 相似文献
50.