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   6565篇
  免费   320篇
  国内免费   43篇
耳鼻咽喉   39篇
儿科学   149篇
妇产科学   87篇
基础医学   928篇
口腔科学   136篇
临床医学   408篇
内科学   1843篇
皮肤病学   175篇
神经病学   391篇
特种医学   216篇
外科学   1194篇
综合类   30篇
预防医学   198篇
眼科学   61篇
药学   412篇
中国医学   11篇
肿瘤学   650篇
  2022年   54篇
  2021年   100篇
  2020年   68篇
  2019年   84篇
  2018年   105篇
  2017年   86篇
  2016年   115篇
  2015年   95篇
  2014年   126篇
  2013年   146篇
  2012年   270篇
  2011年   274篇
  2010年   157篇
  2009年   161篇
  2008年   291篇
  2007年   341篇
  2006年   346篇
  2005年   314篇
  2004年   309篇
  2003年   329篇
  2002年   338篇
  2001年   327篇
  2000年   333篇
  1999年   273篇
  1998年   109篇
  1997年   63篇
  1996年   60篇
  1995年   57篇
  1994年   43篇
  1993年   54篇
  1992年   155篇
  1991年   141篇
  1990年   143篇
  1989年   131篇
  1988年   97篇
  1987年   92篇
  1986年   76篇
  1985年   79篇
  1984年   48篇
  1983年   42篇
  1979年   55篇
  1978年   33篇
  1977年   30篇
  1974年   25篇
  1973年   36篇
  1972年   29篇
  1971年   29篇
  1969年   26篇
  1968年   31篇
  1966年   24篇
排序方式: 共有6928条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
The efficacy of non-pharmacological intervention for chronic insomnia has been proven by several meta-analytic reviews, an NIH report, an American Academy of Sleep Medicine review, and numerous clinical trials. Behavior therapy for chronic insomnia consists of relaxation, stimulus control, sleep restriction, cognitive restructuring and sleep hygiene education, which has produced reliable and durable changes in total sleep time, sleep onset latency, number and duration of awakening. These studies also showed that the post-treatment effect of behavior therapy is equal to that of hypnotic therapy, and that these effects were maintained for 6 months on follow-up assessment. Elderly insomniac patients would gain considerable benefit from behavioral treatments because there are no adverse physical effects as there are from pharmacological therapy. The authors present the basic theory, techniques of behavior therapy for insomnia, and the results of two important key meta-analytic reviews. Any behavioral approach such as convenient education, self-care enhancement by bibliotherapy, and individual face-to-face counseling, seem to be fruitful not only for American but also Japanese insomnia patients. Nonetheless, there are no currently actual intervention studies using behavior therapy in Japan. We have discussed the methodology of intervention study and published a behavioral self-help manual for people with sleep problems. Development of a behavioral approach to chronic insomnia seemed to be very beneficial and a useful contribution to mental health services.  相似文献   
8.
9.
Abstract: A prospective study was performed to determine whether low-density lipoprotein (LDL) apheresis, when performed only immediately before and after percutaneous transluminal coronary angioplasty (PTCA), is effective in preventing restenosis of coronary artery lesions following PTCA. Thirty-six patients with coronary heart disease (CHD) and hypercholesterolemia were divided into 2 groups. The 9 patients in the LDL group underwent LDL-apheresis 1 day before and 5 days after PTCA while the 27 patients of the control group underwent PTCA but did not undergo LDL-apheresis. Follow-up coronary angiography (CAG) was performed 4 months after PTCA. The rate of restenosis of coronary artery lesions was significantly lower in the LDL group (0%) than in the control group (30%). These findings suggest that LDL-apheresis, when performed before and after PTCA, is effective in preventing restenosis of coronary artery lesions in patients with CHD and hypercholesterolemia.  相似文献   
10.
Although the cause varies widely, we recently experienced a case of constrictive pericarditis of which cause seemed to be traumatic as described below. The patient was a 62-year-old man having a history of epigastric trauma about 20 years ago. Since then, palpitation appeared and he was recently hospitalized in our department for the purpose of receiving an operation under the diagnosis of constrictive pericarditis. At operation, a hematoma was found in the pericardial region, which was considered to have been caused by trauma in the past. Less reports have so far been available concerning trauma-induced constrictive pericarditis and this case thus seemed to be of rarity as well.  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