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   6956篇
  免费   332篇
  国内免费   46篇
耳鼻咽喉   42篇
儿科学   149篇
妇产科学   95篇
基础医学   970篇
口腔科学   136篇
临床医学   433篇
内科学   1898篇
皮肤病学   226篇
神经病学   418篇
特种医学   226篇
外科学   1305篇
综合类   32篇
预防医学   217篇
眼科学   64篇
药学   450篇
中国医学   10篇
肿瘤学   663篇
  2021年   105篇
  2020年   66篇
  2019年   88篇
  2018年   108篇
  2017年   87篇
  2016年   123篇
  2015年   105篇
  2014年   143篇
  2013年   159篇
  2012年   313篇
  2011年   300篇
  2010年   186篇
  2009年   191篇
  2008年   324篇
  2007年   379篇
  2006年   376篇
  2005年   348篇
  2004年   337篇
  2003年   363篇
  2002年   370篇
  2001年   337篇
  2000年   333篇
  1999年   275篇
  1998年   109篇
  1997年   71篇
  1996年   60篇
  1995年   54篇
  1994年   47篇
  1993年   60篇
  1992年   157篇
  1991年   140篇
  1990年   141篇
  1989年   132篇
  1988年   98篇
  1987年   91篇
  1986年   77篇
  1985年   80篇
  1984年   48篇
  1983年   42篇
  1979年   55篇
  1978年   34篇
  1977年   30篇
  1974年   24篇
  1973年   36篇
  1972年   29篇
  1971年   29篇
  1969年   26篇
  1968年   31篇
  1967年   23篇
  1966年   24篇
排序方式: 共有7334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.
A 54-year-old man presented with an 8-year history of a hard asymptomatic mass of the left submandibular area. Total excision of the left submandibular gland with radical neck dissection was performed under a diagnosis of a submandibular tumor, probably a malignant mixed tumor. The pathologic diagnosis was carcinosarcoma consisting of carcinomatous and sarcomatous elements. The epithelial component was composed of squamous cell carcinoma, undifferentiated carcinoma, and adenocarcinoma. The nonepithelial component was composed of chondrosarcoma, osteosarcoma, spindle cell sarcoma, rhabdomyosarcoma, and liposarcoma. In the central area of the tumor, a few remnants of benign pleomorphic adenoma were identifiable. The finding suggested that in our patient, the carcinosarcoma arose from a preexisting pleomorphic adenoma. In view of the expected aggressive nature of the tumor, the patient was treated with postoperative radiotherapy of 60 Gy total, in 30 daily fractions of 2 Gy, and chemotherapy. He currently remains well and free of disease 24 months after treatment.  相似文献   
9.
10.
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   
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