全文获取类型
收费全文 | 3576111篇 |
免费 | 268826篇 |
国内免费 | 8712篇 |
专业分类
耳鼻咽喉 | 48918篇 |
儿科学 | 118625篇 |
妇产科学 | 99831篇 |
基础医学 | 503550篇 |
口腔科学 | 102169篇 |
临床医学 | 325202篇 |
内科学 | 697155篇 |
皮肤病学 | 82635篇 |
神经病学 | 293731篇 |
特种医学 | 139415篇 |
外国民族医学 | 1129篇 |
外科学 | 536049篇 |
综合类 | 79301篇 |
现状与发展 | 6篇 |
一般理论 | 1399篇 |
预防医学 | 278702篇 |
眼科学 | 81777篇 |
药学 | 265093篇 |
10篇 | |
中国医学 | 6970篇 |
肿瘤学 | 191982篇 |
出版年
2018年 | 37617篇 |
2017年 | 29141篇 |
2016年 | 33515篇 |
2015年 | 38114篇 |
2014年 | 52427篇 |
2013年 | 79492篇 |
2012年 | 105722篇 |
2011年 | 111709篇 |
2010年 | 67181篇 |
2009年 | 64387篇 |
2008年 | 105122篇 |
2007年 | 111447篇 |
2006年 | 113293篇 |
2005年 | 109098篇 |
2004年 | 105943篇 |
2003年 | 102008篇 |
2002年 | 98890篇 |
2001年 | 167396篇 |
2000年 | 172035篇 |
1999年 | 145579篇 |
1998年 | 42013篇 |
1997年 | 37554篇 |
1996年 | 37577篇 |
1995年 | 36491篇 |
1994年 | 33780篇 |
1993年 | 31733篇 |
1992年 | 116021篇 |
1991年 | 112593篇 |
1990年 | 109329篇 |
1989年 | 105903篇 |
1988年 | 97661篇 |
1987年 | 95951篇 |
1986年 | 90740篇 |
1985年 | 86987篇 |
1984年 | 65122篇 |
1983年 | 55666篇 |
1982年 | 32974篇 |
1981年 | 29630篇 |
1979年 | 59679篇 |
1978年 | 41850篇 |
1977年 | 35552篇 |
1976年 | 33156篇 |
1975年 | 35352篇 |
1974年 | 42331篇 |
1973年 | 40371篇 |
1972年 | 37729篇 |
1971年 | 35252篇 |
1970年 | 32474篇 |
1969年 | 31057篇 |
1968年 | 28388篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Anne-Sophie Worm Fenger Markus Harboe Olsen Maria Louise Fabritius Christian Gunge Riberholt Kirsten Møller 《Acta anaesthesiologica Scandinavica》2023,67(2):240-247
Background
Hyperglycaemia is common in patients with acute brain injury admitted to an intensive care unit (ICU). Many studies have found associations between development of hyperglycaemia and increased mortality in hospitalised patients. However, the optimal target for blood glucose control is unknown. We want to conduct a systematic review with meta-analysis and trial sequential analysis to explore the beneficial and harmful effects of restrictive versus liberal glucose control on patient outcomes in adults with severe acute brain injury.Methods
We will systematically search medical databases including CENTRAL, Embase, MEDLINE and trial registries. We will search the following websites for ongoing or unpublished trials: http://www.controlled-trials.com/ , http://www.clinicaltrials.gov/ , www.eudraCT.com , http://centerwatch.com/ , The Cochrane Library's CENTRAL, PubMed, EMBASE, Science Citation Index Expanded and CINAHL. Two authors will independently review and select trials and extract data. We will include randomised trials comparing levels of glucose control in our analyses and observational studies will be included to address potential harms. The primary outcomes are defined as all-cause mortality, functional outcome and health-related quality of life. Secondary outcomes include serious adverse events including hypoglycaemia, length of ICU stay and duration of mechanical ventilation, and explorative outcomes including intracranial pressure and infection. Trial Sequential Analysis will be used to investigate the risk of type I error due to repetitive testing and to further explore imprecision. Quality of trials will be evaluated using the Cochrane Risk of Bias tool, and quality of evidence will be assessed using the Grading of Recommendations, Assessment, Development and Evaluations (GRADE) approach.Discussion
The results of the systematic review will be disseminated through peer-reviewed publication. With the review, we hope to inform future randomised clinical trials and improve clinical practice. 相似文献32.
Janitz Amanda E. Schraw Jeremy M. Xu Chao Lupo Philip J. 《Cancer causes & control : CCC》2022,33(3):483-488
Cancer Causes & Control - Congenital malformations are strong risk factors for childhood cancer. Our objective was to determine whether cancer survival differs by birth defect status among... 相似文献
33.
Schneider Ralph Dettmer Marius Peters Nora Lamdark Tenzin Luedi Markus M. Adamina Michel Doll Dietrich 《European Surgery》2022,54(2):117-125
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
34.
A Coupled FEM-BEM Approach for the Solution of the Free-Boundary Axi-Symmetric Plasma Equilibrium Problem
下载免费PDF全文
![点击此处可从《Communications In Computational Physics》网站下载免费的PDF全文](/ch/ext_images/free.gif)
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
35.
36.
Byrne Emma Abel Stephen Yu Alexander Shepard Matthew Karlovits Stephen M. Wegner Rodney E. 《Journal of neuro-oncology》2022,157(1):197-205
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
37.
38.
Tengzhi Liu Kathrine Røe Redalen Morten Karlsen 《Journal of labelled compounds & radiopharmaceuticals》2022,65(7):191-202
Cyclotron-produced copper-64 radioisotope tracers offer the possibility to perform both diagnostic investigation by positron emission tomography (PET) and radiotherapy by a theranostic approach with bifunctional chelators. The versatile chemical properties of copper add to the importance of this isotope in medicinal investigation. [64Cu][Cu (ATSM)] has shown to be a viable candidate for imaging of tumor hypoxia; a critical tumor microenvironment characteristic that typically signifies tumor progression and resistance to chemo-radiotherapy. Various production and radiosynthesis methods of [64Cu][Cu (ATSM)] exist in labs, but usually involved non-standardized equipment with varying production qualities and may not be easily implemented in wider hospital settings. [64Cu][Cu (ATSM)] was synthesized on a modified GE TRACERlab FXN automated synthesis module. End-of-synthesis (EOS) molar activity of [64Cu][Cu (ATSM)] was 2.2–5.5 Ci/μmol (HPLC), 2.2–2.6 Ci/μmol (ATSM-titration), and 3.0–4.4 Ci/μmol (ICP-MS). Radiochemical purity was determined to be >99% based on radio-HPLC. The final product maintained radiochemical purity after 20 h. We demonstrated a simple and feasible process development and quality control protocols for automated cyclotron production and synthesis of [64Cu][Cu (ATSM)] based on commercially distributed standardized synthesis modules suitable for PET imaging and theranostic studies. 相似文献
39.
40.
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