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   1017339篇
  免费   76360篇
  国内免费   2695篇
耳鼻咽喉   13102篇
儿科学   35107篇
妇产科学   28929篇
基础医学   148418篇
口腔科学   28106篇
临床医学   92252篇
内科学   197413篇
皮肤病学   23322篇
神经病学   81187篇
特种医学   38866篇
外国民族医学   305篇
外科学   151261篇
综合类   23851篇
一般理论   411篇
预防医学   79923篇
眼科学   22953篇
药学   73011篇
  3篇
中国医学   2066篇
肿瘤学   55908篇
  2018年   11174篇
  2017年   8722篇
  2016年   9935篇
  2015年   11231篇
  2014年   15191篇
  2013年   23110篇
  2012年   30545篇
  2011年   32382篇
  2010年   19397篇
  2009年   18230篇
  2008年   30148篇
  2007年   31766篇
  2006年   32155篇
  2005年   30789篇
  2004年   29922篇
  2003年   28829篇
  2002年   27723篇
  2001年   47050篇
  2000年   48113篇
  1999年   40373篇
  1998年   11353篇
  1997年   10237篇
  1996年   10279篇
  1995年   9896篇
  1994年   9183篇
  1993年   8577篇
  1992年   32296篇
  1991年   31520篇
  1990年   31053篇
  1989年   29918篇
  1988年   27191篇
  1987年   27363篇
  1986年   25476篇
  1985年   24652篇
  1984年   18450篇
  1983年   15560篇
  1982年   9351篇
  1981年   8424篇
  1979年   16894篇
  1978年   12246篇
  1977年   10335篇
  1976年   9781篇
  1975年   10201篇
  1974年   12349篇
  1973年   11871篇
  1972年   10899篇
  1971年   10129篇
  1970年   9393篇
  1969年   8738篇
  1968年   8115篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
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   
75.
76.
77.
78.
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   
79.

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   
80.
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