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   4422篇
  免费   461篇
  国内免费   21篇
耳鼻咽喉   13篇
儿科学   121篇
妇产科学   109篇
基础医学   541篇
口腔科学   83篇
临床医学   455篇
内科学   891篇
皮肤病学   36篇
神经病学   241篇
特种医学   191篇
外科学   1057篇
综合类   162篇
一般理论   2篇
预防医学   280篇
眼科学   36篇
药学   247篇
中国医学   8篇
肿瘤学   431篇
  2021年   49篇
  2020年   35篇
  2019年   59篇
  2018年   55篇
  2016年   62篇
  2015年   52篇
  2014年   94篇
  2013年   104篇
  2012年   140篇
  2011年   161篇
  2010年   122篇
  2009年   103篇
  2008年   142篇
  2007年   154篇
  2006年   134篇
  2005年   149篇
  2004年   157篇
  2003年   148篇
  2002年   131篇
  2001年   149篇
  2000年   157篇
  1999年   121篇
  1998年   78篇
  1997年   65篇
  1996年   68篇
  1995年   65篇
  1994年   52篇
  1993年   57篇
  1992年   141篇
  1991年   146篇
  1990年   145篇
  1989年   151篇
  1988年   116篇
  1987年   101篇
  1986年   98篇
  1985年   90篇
  1984年   81篇
  1983年   78篇
  1982年   52篇
  1981年   40篇
  1980年   52篇
  1979年   72篇
  1978年   50篇
  1977年   61篇
  1976年   50篇
  1975年   41篇
  1974年   54篇
  1973年   40篇
  1972年   47篇
  1970年   36篇
排序方式: 共有4904条查询结果,搜索用时 15 毫秒
1.
Thirty patients completed a double-blind, randomized crossover study utilizing transdermal clonidine and an identical-appearing placebo. Crossover occurred at 6 weeks, with a total study time of 12 weeks. Subjects were asked to record daily in a special diary (1) the presence or absence of headache, (2) duration of headache, (3) severity of headache, and (4) use of pain medication for headache relief. The severity of the headaches was rated from 1 (very mild) to 5 (very severe). Although the subjects reported a decrease in frequency, duration, and intensity of headaches while using the medicated patch, these differences did not reach statistical significance. Nineteen patients subjectively preferred the medicated patch, while five preferred the placebo (P less than .01). During use of the medicated patch, a significant reduction (P = .039) occurred in use of class II narcotics. Three doses of these substances were used by the patients when treated with clonidine, while 34 doses were taken during placebo use. These findings suggest that clonidine might have a role in reduction of parenteral narcotic use in acute pain syndromes.  相似文献   
2.
Gastroesophageal reflux disease is a very common condition that is usually manifested by heartburn or regurgitation. Reflux esophagitis, caused by mucosal exposure to the backflow of caustic gastric contents, is primarily a result of lower esophageal sphincter dysfunction. Diagnostic workup varies but commonly includes esophagoscopy, 24-hour esophageal pH monitoring, and radiography of the upper gastrointestinal tract. Treatment, which progresses from simple life-style changes and antacids to histamine2 receptor antagonists to omeprazole (Prilosec) or surgery, is tailored to individual needs and is generally successful.  相似文献   
3.
4.
5.
6.
7.
This paper describes a response directed stress management intervention (SMI) in the form of a Jungian based preference awareness education (PAE). It uses the Insights System of personality types to increase awareness of behaviour and communication preferences of self and different others. Eighteen self‐recruited academic employees participated for 7 weeks and received feedback about work preferences and personality type. The aim was to reduce perceptions of stress and interpersonal stress and to increase feelings of job satisfaction and interpersonal satisfaction. The data were analysed using two‐tailed t‐tests. No significant findings were observed for the total sample after training, however, interesting results were found for certain sub‐sample groups. Extravert‐thinking types, reported decreased stress levels (p > 0.018), and participants suffering high stress/interpersonal stress pre‐PAE, reported decreased stress levels (p > 0.010–0.018). Participants suffering low job/interpersonal satisfaction pre‐PAE, reported increased job satisfaction (p > 0.015–0.016). These results suggest that individuals who report high levels of stress and dissatisfaction are most likely to benefit from this type of intervention. Future PAE research might: (a) use pilot studies to meet the intervention preferences of employees that are reluctant to participate in SMIs; (b) include a wait‐list control group; use: (c) a follow up education/measures; (d) and organizational level (stressor directed) SMIs at the same time as response directed initiatives. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   
8.
9.
10.
Cardiorespiratory reflexes (CRR) were studied by measuring heart-rate variation during 6 breaths/min respiration and a Valsalva maneuver in 232 insulin-dependent diabetic subjects. Abnormalities were found in 175 patients. During a 7-yr follow-up, 41 (23.4%) patients with abnormal and 2 (3.5%) with normal CRR tests died. The mortality rates of diabetic patients with abnormal autonomic function tests were 17% at 2.5 yr, 33% at 5 yr, and 40% at 7 yr, significantly higher (P less than 0.002) than in patients with normal tests (rates of 4.6, 4.6, and 13.8% at the respective intervals). Nerve conduction studies (NCS) were indicative of somatic neuropathy in 148 of 205 patients. Mortality rates were higher in patients with abnormal NCS than in those with normal results (P less than 0.025). Among patients with abnormal autonomic function, patients with a functioning pancreas transplantation (PTx) had better survival rates than patients with a failed PTx (P less than 0.005) and, on long-term follow-up, better rates than patients without PTx. Similar results were found comparing the same group of patients who had abnormal NCS.  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