全文获取类型
收费全文 | 35219篇 |
免费 | 2347篇 |
国内免费 | 1119篇 |
专业分类
耳鼻咽喉 | 147篇 |
儿科学 | 613篇 |
妇产科学 | 361篇 |
基础医学 | 3856篇 |
口腔科学 | 742篇 |
临床医学 | 4160篇 |
内科学 | 6799篇 |
皮肤病学 | 420篇 |
神经病学 | 2218篇 |
特种医学 | 613篇 |
外国民族医学 | 4篇 |
外科学 | 2432篇 |
综合类 | 5024篇 |
现状与发展 | 5篇 |
预防医学 | 1269篇 |
眼科学 | 200篇 |
药学 | 7766篇 |
9篇 | |
中国医学 | 1151篇 |
肿瘤学 | 896篇 |
出版年
2023年 | 432篇 |
2022年 | 706篇 |
2021年 | 1260篇 |
2020年 | 1022篇 |
2019年 | 964篇 |
2018年 | 893篇 |
2017年 | 955篇 |
2016年 | 919篇 |
2015年 | 1132篇 |
2014年 | 1935篇 |
2013年 | 2442篇 |
2012年 | 1918篇 |
2011年 | 2188篇 |
2010年 | 1747篇 |
2009年 | 1584篇 |
2008年 | 1582篇 |
2007年 | 1653篇 |
2006年 | 1414篇 |
2005年 | 1281篇 |
2004年 | 1116篇 |
2003年 | 1000篇 |
2002年 | 829篇 |
2001年 | 761篇 |
2000年 | 681篇 |
1999年 | 597篇 |
1998年 | 546篇 |
1997年 | 567篇 |
1996年 | 509篇 |
1995年 | 491篇 |
1994年 | 466篇 |
1993年 | 442篇 |
1992年 | 432篇 |
1991年 | 390篇 |
1990年 | 415篇 |
1989年 | 366篇 |
1988年 | 318篇 |
1987年 | 290篇 |
1986年 | 288篇 |
1985年 | 332篇 |
1984年 | 274篇 |
1983年 | 219篇 |
1982年 | 272篇 |
1981年 | 194篇 |
1980年 | 182篇 |
1979年 | 141篇 |
1978年 | 97篇 |
1977年 | 97篇 |
1976年 | 74篇 |
1975年 | 64篇 |
1974年 | 54篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
1.
2.
《Transfusion and apheresis science》2022,61(4):103487
When the COVID-19 pandemic hit, blood transfusion services worldwide started collection of convalescent plasma as early as possible, as exemplified by the response in Norway. There were challenges related to donor selection, donor safety, testing for relevant antibodies and indications for and dosing of the convalescent plasma. As more knowledge became available, the product quality was more standardised. Multiple case reports, observational studies and some randomized studies were published during the pandemic, as well as laboratory studies reporting different approaches to antibody testing. The results were conflicting and the importance of convalescent plasma was disputed.Even though there has been strong international collaboration with involvement of many key organisations, we may better prepare for the next pandemic. An even stronger, more formalised collaboration between these organisations could provide more clear evidence of the importance of convalescent plasma, based on the principles of passive immunisation. 相似文献
3.
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
4.
Noreen M. Walsh Heinz Kutzner Luis Requena Lorenzo Cerroni 《Journal of cutaneous pathology》2019,46(9):698-708
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
5.
目的 探讨健脾消积颗粒治疗脾胃湿热型功能性消化不良的临床疗效及其对脑肠肽的影响。方法 按照随机数字表法将2018年2月-2019年2月我院收治的80例功能性消化不良患儿均分为对照组和观察组,对照组给予多潘立酮片治疗,观察组在对照组基础上加用健脾消积颗粒治疗,比较2组治疗效果。结果 治疗后2组主要临床症状积分均显著下降,观察组下降更为明显。观察组总有效率为95%,显著高于对照组的79.5%。观察组治疗后胃电节律异常例数明显低于对照组,治疗后2组胃动素(MTL)显著上升,神经肽Y(NPY)、神经降压素(NT)显著下降,且观察组和对照组相比,差异有统计学意义。2组治疗期间均未发生不良反应及肝肾功能异常。结论 健脾消积颗粒能够明显改善脾胃湿热型功能性消化不良患儿临床症状,改善胃动力水平,调节脑肠肽分泌水平。 相似文献
6.
7.
Pierre Tiberghien Xavier de Lamballerie Pascal Morel Pierre Gallian Karine Lacombe Yazdan Yazdanpanah 《Vox sanguinis》2020,115(6):488-494
Plasma provided by COVID-19 convalescent patients may provide therapeutic relief as the number of COVID-19 cases escalates steeply worldwide. Prior findings in various viral respiratory diseases including SARS-CoV-related pneumonia suggest that convalescent plasma can reduce mortality, although formal proof of efficacy is still lacking. By reducing viral spread early on, such an approach may possibly downplay subsequent immunopathology. Identifying, collecting, qualifying and preparing plasma from convalescent patients with adequate SARS-CoV-2-neutralizing Ab titres in an acute crisis setting may be challenging, although well within the remit of most blood establishments. Careful clinical evaluation should allow to quickly establish whether such passive immunotherapy, administered at early phases of the disease in patients at high risk of deleterious evolution, may reduce the frequency of patient deterioration, and thereby COVID-19 mortality. 相似文献
8.
9.
10.