全文获取类型
| 收费全文 | 324731篇 |
| 免费 | 43084篇 |
| 国内免费 | 2938篇 |
专业分类
| 耳鼻咽喉 | 7497篇 |
| 儿科学 | 10006篇 |
| 妇产科学 | 5877篇 |
| 基础医学 | 26774篇 |
| 口腔科学 | 5088篇 |
| 临床医学 | 43476篇 |
| 内科学 | 83292篇 |
| 皮肤病学 | 10024篇 |
| 神经病学 | 32464篇 |
| 特种医学 | 12446篇 |
| 外国民族医学 | 13篇 |
| 外科学 | 66422篇 |
| 综合类 | 2633篇 |
| 现状与发展 | 75篇 |
| 一般理论 | 202篇 |
| 预防医学 | 20305篇 |
| 眼科学 | 8102篇 |
| 药学 | 12750篇 |
| 中国医学 | 218篇 |
| 肿瘤学 | 23089篇 |
出版年
| 2023年 | 5276篇 |
| 2022年 | 1824篇 |
| 2021年 | 5875篇 |
| 2020年 | 7567篇 |
| 2019年 | 4986篇 |
| 2018年 | 10555篇 |
| 2017年 | 9556篇 |
| 2016年 | 10942篇 |
| 2015年 | 11552篇 |
| 2014年 | 20124篇 |
| 2013年 | 22992篇 |
| 2012年 | 16879篇 |
| 2011年 | 17682篇 |
| 2010年 | 16869篇 |
| 2009年 | 19965篇 |
| 2008年 | 17307篇 |
| 2007年 | 16512篇 |
| 2006年 | 18248篇 |
| 2005年 | 16093篇 |
| 2004年 | 14721篇 |
| 2003年 | 13240篇 |
| 2002年 | 12868篇 |
| 2001年 | 5167篇 |
| 2000年 | 4032篇 |
| 1999年 | 4662篇 |
| 1998年 | 5793篇 |
| 1997年 | 5289篇 |
| 1996年 | 4894篇 |
| 1995年 | 4609篇 |
| 1994年 | 3296篇 |
| 1993年 | 2882篇 |
| 1992年 | 2411篇 |
| 1991年 | 2339篇 |
| 1990年 | 1893篇 |
| 1989年 | 1964篇 |
| 1988年 | 1846篇 |
| 1987年 | 1581篇 |
| 1986年 | 1721篇 |
| 1985年 | 1640篇 |
| 1984年 | 1795篇 |
| 1983年 | 1693篇 |
| 1982年 | 2124篇 |
| 1981年 | 1901篇 |
| 1980年 | 1733篇 |
| 1979年 | 1080篇 |
| 1978年 | 1221篇 |
| 1977年 | 1164篇 |
| 1976年 | 939篇 |
| 1975年 | 835篇 |
| 1974年 | 816篇 |
排序方式： 共有10000条查询结果，搜索用时 812 毫秒
21.
22.
23.
24.
Robert C. Lynall J. Troy Blackburn Kevin M. Guskiewicz Stephen W. Marshall Prudence Plummer Jason P. Mihalik 《Journal of Science and Medicine in Sport》2019,22(5):503-508
Objectives
Despite evidence for increased musculoskeletal injury after concussion recovery, there is a lack of dynamic balance assessments that could inform management and research into this increased injury risk post-concussion. Our purpose was to identify tandem gait dynamic balance deficits in recreational athletes with a concussion history within the past 18-months compared to matched controls.Design
Cross-sectional, laboratory study.Methods
Fifteen participants with a concussion history (age: 19.7 ± 0.9 years; 9 females; median time since concussion 126 days, range 28–432 days), and 15 matched controls (19.7 ± 1.6 years; 9 females) with no recent concussion history participated. We measured center-of-pressure (COP) outcomes (velocity, path length, speed, dual-task cost) under 4 tandem gait conditions: (1) tandem gait, (2) tandem gait, eyes closed, (3) tandem gait, eyes open, cognitive distraction, and (4) tandem gait, eyes closed, cognitive distraction.Results
The concussion history group demonstrated slower tandem gait velocity compared to the control group (4.0 cm/s difference), thus velocity was used as a covariate when analyzing COP path length and speed. The concussion history group (23.5%) demonstrated greater COP speed dual-task cost than the control group (16.3%) during the eyes closed dual-task condition. No other comparisons were statistically significant.Conclusions
There may be subtle dynamic balance differences during tandem gait that are detectable after return-to-activity following concussion, but the clinical significance of these findings is unclear. Longitudinal investigations should identify acute movement deficits in varying visual and cognitive scenarios after concussion in comparison with recovery on traditional concussion assessment tools while also recording musculoskeletal injury outcomes. 相似文献25.
Alexander E. J. Trevatt David R. Thomson Robert Miller Matthew Colquhoun Akinyemi I. Idowu Shakeel Rahman 《Journal of plastic surgery and hand surgery》2019,53(2):97-104
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia. 相似文献
26.
27.
Elizabeth D. Krebs Robert B. Hawkins J. Hunter Mehaffey Clifford E. Fonner Alan M. Speir Mohammed A. Quader Jeffrey B. Rich Leora T. Yarboro Nicholas R. Teman Gorav Ailawadi 《The Journal of thoracic and cardiovascular surgery》2019,157(4):1533-1542.e2
Objectives
Expedient extubation after cardiac surgery has been associated with improved outcomes, leading to postoperative extubation frequently during overnight hours. However, recent evidence in a mixed medical-surgical intensive care unit population demonstrated worse outcomes with overnight extubation. This study investigated the impact of overnight extubation in a statewide, multicenter Society of Thoracic Surgeons database.Methods
Records from 39,812 patients undergoing coronary artery bypass grafting or valve operations (2008-2016) and extubated within 24 hours were stratified according to extubation time between 06:00 and 18:00 (day) or between 18:00 and 6:00 (overnight). Outcomes including reintubation, mortality, and composite morbidity-mortality were evaluated using hierarchical regression models adjusted for Society of Thoracic Surgeons predictive risk scores. To further analyze extubation during the night, a subanalysis stratified patients into 3 groups: 06:00 to 18:00, 18:00 to 24:00, and 24:00 to 06:00.Results
A total of 20,758 patients were extubated overnight (52.1%) and were slightly older (median age 66 vs 65 years, P < .001) with a longer duration of ventilation (4 vs 7 hours, P < .001). Day and overnight extubation were associated with equivalent operative mortality (1.7% vs 1.7%, P = .880), reintubation (3.7% vs 3.4%, P = .141), and composite morbidity-mortality (8.2% vs 8.0%, P = .314). After risk adjustment, overnight extubation was not associated with any difference in reintubation, mortality, or composite morbidity-mortality. On subanalysis, those extubated between 24:00 and 06:00 exhibited increased composite morbidity-mortality (odds ratio, 1.18; P = .001) but no difference in reintubation or mortality.Conclusions
Extubation overnight was not associated with increased mortality or reintubation. These results suggest that in the appropriate clinical setting, it is safe to routinely extubate cardiac surgery patients overnight. 相似文献28.
29.
30.