全文获取类型
| 收费全文 | 3154043篇 |
| 免费 | 247222篇 |
| 国内免费 | 5647篇 |
专业分类
| 耳鼻咽喉 | 45753篇 |
| 儿科学 | 101359篇 |
| 妇产科学 | 85114篇 |
| 基础医学 | 445632篇 |
| 口腔科学 | 89865篇 |
| 临床医学 | 286515篇 |
| 内科学 | 614086篇 |
| 皮肤病学 | 65680篇 |
| 神经病学 | 260447篇 |
| 特种医学 | 125628篇 |
| 外国民族医学 | 1301篇 |
| 外科学 | 476436篇 |
| 综合类 | 74112篇 |
| 现状与发展 | 2篇 |
| 一般理论 | 1236篇 |
| 预防医学 | 252442篇 |
| 眼科学 | 73756篇 |
| 药学 | 235869篇 |
| 6篇 | |
| 中国医学 | 5945篇 |
| 肿瘤学 | 165728篇 |
出版年
| 2018年 | 32468篇 |
| 2017年 | 24872篇 |
| 2016年 | 27435篇 |
| 2015年 | 30975篇 |
| 2014年 | 44312篇 |
| 2013年 | 67586篇 |
| 2012年 | 91768篇 |
| 2011年 | 97112篇 |
| 2010年 | 57394篇 |
| 2009年 | 54838篇 |
| 2008年 | 92257篇 |
| 2007年 | 98363篇 |
| 2006年 | 99013篇 |
| 2005年 | 96335篇 |
| 2004年 | 93231篇 |
| 2003年 | 90236篇 |
| 2002年 | 88690篇 |
| 2001年 | 145977篇 |
| 2000年 | 151173篇 |
| 1999年 | 128144篇 |
| 1998年 | 37091篇 |
| 1997年 | 33622篇 |
| 1996年 | 33491篇 |
| 1995年 | 32297篇 |
| 1994年 | 30273篇 |
| 1993年 | 28276篇 |
| 1992年 | 103081篇 |
| 1991年 | 100174篇 |
| 1990年 | 96793篇 |
| 1989年 | 93198篇 |
| 1988年 | 86305篇 |
| 1987年 | 85035篇 |
| 1986年 | 80256篇 |
| 1985年 | 76773篇 |
| 1984年 | 58218篇 |
| 1983年 | 49552篇 |
| 1982年 | 29815篇 |
| 1981年 | 26751篇 |
| 1979年 | 54229篇 |
| 1978年 | 37978篇 |
| 1977年 | 32135篇 |
| 1976年 | 30201篇 |
| 1975年 | 32100篇 |
| 1974年 | 39132篇 |
| 1973年 | 37293篇 |
| 1972年 | 34768篇 |
| 1971年 | 31994篇 |
| 1970年 | 30296篇 |
| 1969年 | 28030篇 |
| 1968年 | 25525篇 |
排序方式： 共有10000条查询结果，搜索用时 14 毫秒
171.
172.
D. Panigrahy P. K. Sahu 《Australasian physical & engineering sciences in medicine / supported by the Australasian College of Physical Scientists in Medicine and the Australasian Association of Physical Sciences in Medicine》2016,39(3):783-795
Electrocardiogram (ECG) signal gives a lot of information on the physiology of heart. In reality, noise from various sources interfere with the ECG signal. To get the correct information on physiology of the heart, noise cancellation of the ECG signal is required. In this paper, the effectiveness of extended Kalman smoother (EKS) with the differential evolution (DE) technique for noise cancellation of the ECG signal is investigated. DE is used as an automatic parameter selection method for the selection of ten optimized components of the ECG signal, and those are used to create the ECG signal according to the real ECG signal. These parameters are used by the EKS for the development of the state equation and also for initialization of the parameters of EKS. EKS framework is used for denoising the ECG signal from the single channel. The effectiveness of proposed noise cancellation technique has been evaluated by adding white, colored Gaussian noise and real muscle artifact noise at different SNR to some visually clean ECG signals from the MIT-BIH arrhythmia database. The proposed noise cancellation technique of ECG signal shows better signal to noise ratio (SNR) improvement, lesser mean square error (MSE) and percent of distortion (PRD) compared to other well-known methods. 相似文献
173.
174.
175.
176.
177.
178.
Miguel A. Sanz Pau Montesinos Haesook T. Kim Guillermo J. Ruiz-Argüelles María S. Undurraga María R. Uriarte Lem Martínez Rafael H. Jacomo Homero Gutiérrez-Aguirre Raul A. M. Melo Rosane Bittencourt Ricardo Pasquini Katia Pagnano Evandro M. Fagundes Edo Vellenga Alexandra Holowiecka Ana J. González-Huerta Pascual Fernández Javier De la Serna Salut Brunet Elena De Lisa José González-Campos José M. Ribera Isabel Krsnik Arnold Ganser Nancy Berliner Raul C. Ribeiro Francesco Lo-Coco Bob L?wenberg Eduardo M. Rego 《Annals of hematology》2015,94(8):1347-1356
179.
Daniel J. Snyder Thomas R. Kroshus Aakash Keswani Evan B. Garden Karl M. Koenig Kevin J. Bozic David S. Jevsevar Jashvant Poeran Calin S. Moucha 《The Journal of arthroplasty》2019,34(4):613-618
Background
Nursing Home Compare (NHC) ratings, created and maintained by Medicare, are used by both hospitals and consumers to aid in the skilled nursing facility (SNF) selection process. To date, no studies have linked NHC ratings to actual episode-based outcomes. The purpose of this study was to evaluate whether NHC ratings are valid predictors of 90-day complications, readmission, and bundle costs for patients discharged to an SNF after primary total joint arthroplasty (TJA).Methods
All SNF-discharged primary TJA cases in 2017 at a multihospital academic health system were queried. Demographic, psychosocial, and clinical variables were manually extracted from the health record. Medicare NHC ratings were then collected for each SNF. For patients in the Medicare bundle, postacute and total bundle cost was extracted from claims.Results
Four hundred eighty-eight patients were discharged to a total of 105 unique SNFs. In multivariate analysis, overall NHC rating was not predictive of 90-day readmission/major complications, >75th percentile postacute cost, or 90-day bundle cost exceeding the target price. SNF health inspection and quality measure ratings were also not predictive of 90-day readmission/major complications or bundle performance. A higher SNF staffing rating was independently associated with a decreased odds for >75th percentile 90-day postacute spend (odds ratio, 0.58; P = .01) and a 90-day bundle cost exceeding the target price (odds ratio = 0.69; P = .02) but was similarly not predictive of 90-day readmission/complications.Conclusion
Results of our study suggest that Medicare's NHC tool is not a useful predictor of 90-day costs, complications, or readmissions for SNFs within our health system. 相似文献180.
Bimal Bhindi Christine M. Lohse Phillip J. Schulte Ross J. Mason John C. Cheville Stephen A. Boorjian Bradley C. Leibovich R. Houston Thompson 《European urology》2019,75(5):766-772