全文获取类型
收费全文 | 56941篇 |
免费 | 3894篇 |
国内免费 | 428篇 |
专业分类
耳鼻咽喉 | 305篇 |
儿科学 | 1524篇 |
妇产科学 | 981篇 |
基础医学 | 4860篇 |
口腔科学 | 734篇 |
临床医学 | 4248篇 |
内科学 | 7130篇 |
皮肤病学 | 744篇 |
神经病学 | 2344篇 |
特种医学 | 1485篇 |
外科学 | 5882篇 |
综合类 | 13678篇 |
现状与发展 | 1篇 |
一般理论 | 14篇 |
预防医学 | 11173篇 |
眼科学 | 423篇 |
药学 | 2957篇 |
82篇 | |
中国医学 | 1441篇 |
肿瘤学 | 1257篇 |
出版年
2024年 | 79篇 |
2023年 | 671篇 |
2022年 | 1283篇 |
2021年 | 2011篇 |
2020年 | 1773篇 |
2019年 | 3617篇 |
2018年 | 3188篇 |
2017年 | 2093篇 |
2016年 | 1292篇 |
2015年 | 1417篇 |
2014年 | 3588篇 |
2013年 | 3398篇 |
2012年 | 3373篇 |
2011年 | 3596篇 |
2010年 | 2902篇 |
2009年 | 2508篇 |
2008年 | 2483篇 |
2007年 | 2099篇 |
2006年 | 1964篇 |
2005年 | 1399篇 |
2004年 | 1072篇 |
2003年 | 919篇 |
2002年 | 630篇 |
2001年 | 498篇 |
2000年 | 462篇 |
1999年 | 373篇 |
1998年 | 316篇 |
1997年 | 298篇 |
1996年 | 213篇 |
1995年 | 214篇 |
1994年 | 182篇 |
1993年 | 111篇 |
1992年 | 76篇 |
1991年 | 85篇 |
1990年 | 65篇 |
1988年 | 62篇 |
1987年 | 59篇 |
1985年 | 884篇 |
1984年 | 1431篇 |
1983年 | 1138篇 |
1982年 | 1129篇 |
1981年 | 1113篇 |
1980年 | 975篇 |
1979年 | 861篇 |
1978年 | 673篇 |
1977年 | 474篇 |
1976年 | 637篇 |
1975年 | 562篇 |
1974年 | 475篇 |
1973年 | 434篇 |
排序方式: 共有10000条查询结果,搜索用时 312 毫秒
91.
探索临床技能培训和提高学生临床实践能力的有效方法.通过培训前考核、观看教学片、指导教师示范、模拟练习、现场点评、培训后考核等方式,比较培训前后考核成绩.通过短期集中培训,使实习生在临床技能方面快速提高.学生们很快掌握了临床基本技能操作规范,为更好地投入到临床实习打下了良好的基础. 相似文献
92.
93.
The choice of therapies for Crohn's disease has expanded greatly over the past 30 years. Increasingly it is important that we attempt to identify subgroups of patients who will benefit most from each type of therapy. This article reviews the therapeutic options currently available, organized by the goal the practitioner hopes to achieve. Imaging is one critical way of aiding the classification of Crohn's disease by attempting to accurately determine the location, extent and, most importantly, the nature of the disease. 相似文献
94.
This paper examines the uses of evidence-based medicine (EBM) in post-Soviet Russia through the use of semi-structured interviews. It asks what it means to talk about practicing evidence-based medicine in a setting where the context of practice presents considerable barriers to the implementation of EBM principles. Drawing on interviews with Russian physicians, medical students and users of the healthcare system, the paper argues that in post-Soviet Russia EBM serves as a strategic discourse for segments of the medical profession. With the collapse of the U.S.S.R. the healthcare system has been going through a period of crisis, and Russian physicians are finding that they have to redefine their professional identity with respect to the domestic and the international context and have to seek new sources for legitimating their professional position. The western origins of EBM endow this rhetoric with considerable power in the Russian context and render it a very useful tool in the project of redefinition. 相似文献
95.
96.
97.
In today''s environment, providers are extremely time-constrained. Assembling relevant contextual data to make decisions on laboratory results can take a significant amount of time from the day. The Regenstrief Institute has created a system which leverages data within Indiana Health Information Exchange''s (IHIE''s) repository, the Indiana Network for Patient Care (INPC), to provide well-organized and contextual information on returning laboratory results to outpatient providers. The system described here uses data extracted from INPC to add historical test results, medication-dispensing events, visit information, and clinical reminders to traditional laboratory result reports. These “Enhanced Laboratory Reports” (ELRs) are seamlessly delivered to outpatient practices connected through IHIE via the DOCS4DOCS clinical messaging service. All practices, including those without electronic medical record systems, can receive ELRs. In this paper, the design and implementation issues in creating this system are discussed, and generally favorable preliminary results of attitudes by providers towards ELRs are reported. 相似文献
98.
We focus on the Fisher information matrix used for design evaluation and optimization in nonlinear mixed effects multiple response models. We evaluate the appropriateness of its expression computed by linearization as proposed for a single response model. Using a pharmacokinetic–pharmacodynamic (PKPD) example, we first compare the computation of the Fisher information matrix with approximation to one derived from the observed matrix on a large simulation using the stochastic approximation expectation–maximization algorithm (SAEM). The expression of the Fisher information matrix for multiple responses is also evaluated by comparison with the empirical information obtained through a replicated simulation study using the first‐order linearization estimation methods implemented in the NONMEM software (first‐order (FO), first‐order conditional estimate (FOCE)) and the SAEM algorithm in the MONOLIX software. The predicted errors given by the approximated information matrix are close to those given by the information matrix obtained without linearization using SAEM and to the empirical ones obtained with FOCE and SAEM. The simulation study also illustrates the accuracy of both FOCE and SAEM estimation algorithms when jointly modelling multiple responses and the major limitations of the FO method. This study highlights the appropriateness of the approximated Fisher information matrix for multiple responses, which is implemented in PFIM 3.0, an extension of the R function PFIM dedicated to design evaluation and optimization. It also emphasizes the use of this computing tool for designing population multiple response studies, as for instance in PKPD studies or in PK studies including the modelling of the PK of a drug and its active metabolite. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
99.
Selecting an appropriate working correlation structure is pertinent to clustered data analysis using generalized estimating equations (GEE) because an inappropriate choice will lead to inefficient parameter estimation. We investigate the well‐known criterion of QIC for selecting a working correlation structure, and have found that performance of the QIC is deteriorated by a term that is theoretically independent of the correlation structures but has to be estimated with an error. This leads us to propose a correlation information criterion (CIC) that substantially improves the QIC performance. Extensive simulation studies indicate that the CIC has remarkable improvement in selecting the correct correlation structures. We also illustrate our findings using a data set from the Madras Longitudinal Schizophrenia Study. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
100.
医疗行为的特殊性,决定了医患双方在医学信息方面的不对称性和医者拥有一定的自由裁量权,因此,医者作为医疗服务的主体,如何增强自律意识,直接关系到诚信的树立及和谐的互动式医患关系的建立和发展。 相似文献