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   2456406篇
  免费   183761篇
  国内免费   5028篇
耳鼻咽喉   34399篇
儿科学   81412篇
妇产科学   70754篇
基础医学   353333篇
口腔科学   68407篇
临床医学   215460篇
内科学   483396篇
皮肤病学   55410篇
神经病学   196994篇
特种医学   93427篇
外国民族医学   794篇
外科学   370286篇
综合类   54379篇
现状与发展   4篇
一般理论   760篇
预防医学   191696篇
眼科学   56551篇
药学   180233篇
  2篇
中国医学   5381篇
肿瘤学   132117篇
  2018年   27377篇
  2017年   20437篇
  2016年   22932篇
  2015年   25982篇
  2014年   35930篇
  2013年   54176篇
  2012年   74588篇
  2011年   79362篇
  2010年   46496篇
  2009年   43599篇
  2008年   74231篇
  2007年   79309篇
  2006年   80156篇
  2005年   78093篇
  2004年   74905篇
  2003年   71745篇
  2002年   70071篇
  2001年   114489篇
  2000年   117366篇
  1999年   98445篇
  1998年   28058篇
  1997年   25208篇
  1996年   25338篇
  1995年   23981篇
  1994年   22072篇
  1993年   20739篇
  1992年   76423篇
  1991年   74006篇
  1990年   72157篇
  1989年   69540篇
  1988年   64214篇
  1987年   62981篇
  1986年   59446篇
  1985年   56726篇
  1984年   42830篇
  1983年   36723篇
  1982年   22090篇
  1981年   19649篇
  1979年   39305篇
  1978年   27788篇
  1977年   23463篇
  1976年   22318篇
  1975年   23824篇
  1974年   28404篇
  1973年   27383篇
  1972年   25864篇
  1971年   23797篇
  1970年   22471篇
  1969年   21275篇
  1968年   19993篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
103.
104.
105.
106.
107.
108.
CONTEXT: Although the nonmedical use of stimulant drugs such as cocaine and methamphetamine is increasingly common in many rural areas of the United States, little is known about the health beliefs of people who use these drugs. PURPOSE: This research describes illicit stimulant drug users' views on health and health-related concepts that may affect their utilization of health care services. METHODS: A respondent-driven sampling plan was used to recruit 249 not-in-treatment, nonmedical stimulant drug users who were residing in 3 rural counties in west central Ohio. A structured questionnaire administered by trained interviewers was used to collect information on a range of topics, including current drug use, self-reported health status, perceived need for substance abuse treatment, and beliefs about health and health services. FINDINGS: Participants reported using a wide variety of drugs nonmedically, some by injection. Alcohol and marijuana were the most commonly used drugs in the 30 days prior to the interview. Powder cocaine was used by 72.3% of the sample, crack by 68.3%, and methamphetamine by 29.7%. Fair or poor health status was reported by 41.3% of the participants. Only 20.9% of the sample felt they needed drug abuse treatment. Less than one third of the sample reported that they would feel comfortable talking to a physician about their drug use, and 65.1% said they preferred taking care of their problems without getting professional help. CONCLUSIONS: Stimulant drug users in rural Ohio are involved with a range of substances and hold health beliefs that may impede health services utilization.  相似文献   
109.
PURPOSE: In children with locally advanced or recurrent malignant tumours, prognosis can be improved by regional deep hyperthermia (RHT) in combination with platin-based chemotherapy. However, because of the increasing number of patients that achieve long-time remission with this therapy, it is necessary to evaluate long-term sequelae of thermochemotherapy. During the years 1993-2004 one has observed avascular osteonecrosis (AON) of the femoral head after RHT in seven children with pelvic germ cell tumours or rhabdomyosarcomas. METHODS: Although AON may develop in patients with malignancies treated with chemo- or radiotherapy alone, RHT might nevertheless contribute to the occurrence of AON. In order to determine potential risk factors for AON after RHT, this study analysed the relationship of AON to the patient's age, medical history and treatment parameters such as thermal dose equivalent and power output. RESULTS AND CONCLUSIONS: In the present study AON was associated with young age as well as intensity of hyperthermia indicated by high power levels that exceed 20 W per kg body weight and/or application of eight or more heat sessions as well as additional radiotherapy. Based on this observation, it was assumed that an optimized three dimensional thermal field modelling may be helpful to avoid hazardous temperatures in the femoral heads during RHT treatment and to reduce AON of the femoral heads.  相似文献   
110.
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