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   13758篇
  免费   1223篇
  国内免费   9篇
耳鼻咽喉   109篇
儿科学   352篇
妇产科学   367篇
基础医学   1964篇
口腔科学   530篇
临床医学   1629篇
内科学   2985篇
皮肤病学   104篇
神经病学   1140篇
特种医学   575篇
外科学   1646篇
综合类   256篇
一般理论   8篇
预防医学   1560篇
眼科学   158篇
药学   863篇
中国医学   4篇
肿瘤学   740篇
  2021年   182篇
  2020年   114篇
  2019年   179篇
  2018年   188篇
  2017年   138篇
  2016年   179篇
  2015年   187篇
  2014年   322篇
  2013年   424篇
  2012年   612篇
  2011年   684篇
  2010年   376篇
  2009年   308篇
  2008年   643篇
  2007年   576篇
  2006年   616篇
  2005年   585篇
  2004年   515篇
  2003年   466篇
  2002年   453篇
  2001年   438篇
  2000年   420篇
  1999年   404篇
  1998年   158篇
  1997年   134篇
  1996年   152篇
  1995年   128篇
  1994年   108篇
  1992年   363篇
  1991年   353篇
  1990年   309篇
  1989年   306篇
  1988年   304篇
  1987年   262篇
  1986年   286篇
  1985年   255篇
  1984年   237篇
  1983年   227篇
  1982年   155篇
  1981年   133篇
  1980年   114篇
  1979年   210篇
  1978年   153篇
  1977年   138篇
  1976年   118篇
  1975年   101篇
  1974年   135篇
  1973年   126篇
  1972年   107篇
  1968年   104篇
排序方式: 共有10000条查询结果,搜索用时 625 毫秒
61.
A comparison of contraceptive use in the early to mid-1980s among married Puerto Rican women aged 15-49 in the New York City area reveals that island-born Puerto Rican women living in New York rely on female sterilization to nearly the same extent as do women living in Puerto Rico (45% and 41%, respectively) and that mainland-born Puerto Rican women use sterilization as much as do all women in the United States (19% for both groups). Puerto Rican women in New York use reversible methods to a greater extent than do women in Puerto Rico (22% v. 16%), but to a lesser extent than do all women in the United States (37%). Although mainland-born Puerto Rican women in New York use reversible methods more than do island-born women in New York (42% v. 23%), they tend not to adopt these methods to the same extent as do all U.S. women during the early reproductive years, when education and employment are critical to socioeconomic attainment.  相似文献   
62.
The association between perceptions about condom use among one's peers, beliefs about new HIV treatments, and HIV sexual risk behavior was examined in a large urban sample ( N = 454) of gay and bisexual men in the Southeast. Results partially confirmed the hypothesis that men who endorsed new HIV treatment beliefs would report lower norms for condom use and higher HIV sexual risk behaviors than men who failed to endorse HIV treatment beliefs but with casual, and not main, partners. Moreover, results confirmed the hypothesis that the association between HIV treatment beliefs and unprotected sex would be partially mediated by peer condom norms. Results suggest social interventions are needed to promote condom norms in the social context of new HIV treatments. © 2006 Wiley Periodicals, Inc.  相似文献   
63.
The Missouri Department of Health realized it had a problem with 67 different information systems that ran on different platforms and could not communicate with one another. A new, integrated information system, the Missouri Health Strategic Architectures and Information Cooperative (MOHSAIC) is being developed based on information engineering (IE). This article describes IE, the process of developing MOHSAIC, and some key lessons learned in developing the system. Some of the lessons learned include the importance of executive sponsorship, tension between efficiency and program accountability, importance of confidentiality, and difficulties of funding an integrated system. The article stresses how integrated information systems will be important for the viability of public health under health care reform.  相似文献   
64.
Factors predicting the early institutionalization of demented patients were studied in 143 outpatients using univariate and multivariate life-table methods. Four types of factors were evaluated for prognostic value: severity of functional impairment, behavioral disorders, individual patient characteristics, and type of caregiver. After follow-up of 19 +/- 12 months, 51 patients had been institutionalized. Increased global severity of dementia, the presence of troublesome and disruptive behaviors, and incontinence increased the likelihood of institutionalization. The best predictors of institutionalization were paranoia, aggressive behavior, and incontinence. Neither individual patient characteristics (age, education, and gender) nor caregiver relationship to the patient (male spouse, female spouse, and male or female child) influenced institutionalization. Since troublesome behavioral disorders are potentially treatable aspects of dementia leading to institutionalization, their management should be a major focus of therapy in dementia.  相似文献   
65.
66.
67.
68.
D-cycloserine augmented exposure therapy for obsessive-compulsive disorder.   总被引:1,自引:1,他引:0  
BACKGROUND: D-cycloserine (DCS), a glutamatergic partial N-methyl-d-aspartate (NMDA) agonist, can facilitate extinction learning related to cued fear in animals and humans. We predicted that DCS would accelerate obsession-related distress reduction in patients with obsessive-compulsive disorder (OCD) undergoing extinction-based exposure therapy. METHODS: We administered DCS (125 mg) or placebo in a double-blind fashion to individuals with OCD approximately 2 hours before each exposure session. RESULTS: D-cycloserine decreased both the number of exposure sessions required to achieve clinical milestones and the rate of therapy dropout. After four exposure sessions, patients in the DCS group reported significantly greater decreases in obsession-related distress compared with the placebo group; however, after additional sessions, the placebo group tended to catch up. CONCLUSIONS: D-cycloserine augmentation has the potential to increase the efficiency, palatability, and overall effectiveness of standard exposure therapy for OCD.  相似文献   
69.
70.
A report of a patient who developed acute suppurative parotitis while on total parenteral nutrition for small bowel fistula is presented. The importance of early detection of parotitis as a cause of fever is emphasized. Attention to oral hygiene and early resumption of oral intake, whenever possible, are to be encouraged.  相似文献   
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