首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1007188篇
  免费   75750篇
  国内免费   2628篇
耳鼻咽喉   13034篇
儿科学   34784篇
妇产科学   28844篇
基础医学   146370篇
口腔科学   27981篇
临床医学   91320篇
内科学   195882篇
皮肤病学   23171篇
神经病学   79798篇
特种医学   38704篇
外国民族医学   308篇
外科学   150820篇
综合类   23889篇
一般理论   392篇
预防医学   78604篇
眼科学   22930篇
药学   72355篇
  3篇
中国医学   2034篇
肿瘤学   54343篇
  2018年   10691篇
  2017年   8362篇
  2016年   9475篇
  2015年   10722篇
  2014年   14595篇
  2013年   22287篇
  2012年   29366篇
  2011年   31256篇
  2010年   18754篇
  2009年   17659篇
  2008年   29172篇
  2007年   30839篇
  2006年   31356篇
  2005年   30051篇
  2004年   29312篇
  2003年   28165篇
  2002年   27188篇
  2001年   47246篇
  2000年   48322篇
  1999年   40501篇
  1998年   11265篇
  1997年   10180篇
  1996年   10241篇
  1995年   9852篇
  1994年   9165篇
  1993年   8566篇
  1992年   32510篇
  1991年   31709篇
  1990年   31246篇
  1989年   30089篇
  1988年   27375篇
  1987年   27539篇
  1986年   25634篇
  1985年   24780篇
  1984年   18536篇
  1983年   15641篇
  1982年   9368篇
  1981年   8461篇
  1979年   16994篇
  1978年   12321篇
  1977年   10415篇
  1976年   9829篇
  1975年   10253篇
  1974年   12415篇
  1973年   11936篇
  1972年   10963篇
  1971年   10179篇
  1970年   9457篇
  1969年   8789篇
  1968年   8171篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
83.
84.
Researchers interested in measuring neighborhood‐level effects should understand how “neighborhood” is defined within nursing sciences and other sciences, and the inherent strengths and weaknesses of current research methodologies. This concept analysis provides clarity around the concept of neighborhood within the context of health, analyzes the current state of development of the neighborhood concept, and proposes areas for future nursing research. Using the Rodger's Method of analysis, the concept of neighborhood within nursing and public health research is described based on existing literature. The concept's attributes, related concepts, antecedents, and consequences are given from the literature. Comparisons of the use of neighborhood are made between nursing, public health, sociology, and other sciences. The evolution of the concept of neighborhood throughout history is described, and important implications for future research are discussed.  相似文献   
85.
86.
87.
88.
Gastroesophageal reflux is the most common benign disorder of the esophagus and laparoscopic Nissen fundoplication has become the standard surgical treatment for its treatment. In our area, where the use of bougie calibration is debatable, postoperative dysphagia is encountered often after this surgery although it is usually not permanent. The aim of this study was to investigate the effect of using a soft silicone tube 39 F in diameter for esophageal calibration during laparoscopic Nissen fundoplication on the incidence of postoperative dysphagia. We divided cases scheduled to undergo laparoscopic Nissen fundoplication between January 2009 and November 2010 into two groups, each consisting 25 patients. Esophageal calibration with a 39 F silicone orogastric tube was used for the first group while there was no operative calibration in the second group. The surgical duration was recorded; the presence and severity of the postoperative dysphagia was calculated by using a dysphagia severity scoring system during the 1-year postoperative follow-up. The dysphagia severity scores were significantly lower in group 1 than group 2 on the postoperative second day and at the end of the first week and first month. We did not find a significant difference at the end of the 6-month and first year. There was also no significant difference regarding surgery duration. The use of a soft orogastric tube 39 F in diameter for esophagus calibration during laparoscopic Nissen fundoplication has significantly decreased the incidence of postoperative transient dysphagia without affecting the duration of surgery. Although dysphagia gradually resolves in the majority of patients, a safe and easy calibration method for its prevention is worth developing, and we believe that the use of our method in larger series could be beneficial.  相似文献   
89.

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   
90.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号