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   8507篇
  免费   596篇
  国内免费   52篇
耳鼻咽喉   43篇
儿科学   230篇
妇产科学   259篇
基础医学   1386篇
口腔科学   194篇
临床医学   913篇
内科学   1681篇
皮肤病学   181篇
神经病学   845篇
特种医学   293篇
外国民族医学   7篇
外科学   759篇
综合类   47篇
一般理论   2篇
预防医学   732篇
眼科学   90篇
药学   687篇
中国医学   20篇
肿瘤学   786篇
  2024年   9篇
  2023年   58篇
  2022年   110篇
  2021年   220篇
  2020年   153篇
  2019年   204篇
  2018年   211篇
  2017年   174篇
  2016年   241篇
  2015年   244篇
  2014年   351篇
  2013年   417篇
  2012年   677篇
  2011年   802篇
  2010年   423篇
  2009年   380篇
  2008年   607篇
  2007年   656篇
  2006年   615篇
  2005年   585篇
  2004年   501篇
  2003年   407篇
  2002年   392篇
  2001年   61篇
  2000年   48篇
  1999年   68篇
  1998年   77篇
  1997年   80篇
  1996年   63篇
  1995年   45篇
  1994年   47篇
  1993年   33篇
  1992年   32篇
  1991年   16篇
  1990年   13篇
  1989年   11篇
  1988年   12篇
  1987年   7篇
  1986年   8篇
  1985年   9篇
  1984年   8篇
  1983年   9篇
  1982年   5篇
  1979年   4篇
  1973年   4篇
  1970年   8篇
  1969年   4篇
  1968年   9篇
  1967年   9篇
  1966年   5篇
排序方式: 共有9155条查询结果,搜索用时 31 毫秒
1.
European Surgery - Large skin defects caused by trauma (e.g., burns) or due to other reasons (e.g., tumor-related skin resections) require sufficient skin replacement. The constant improvement of...  相似文献   
2.
3.
4.
5.
6.
7.
8.
We describe a case of a palatal tic resembling palatal tremor (PT) in a young female patient with a previously unrecognized mild Tourette syndrome. At the time of her visit, the patient complained about ear clicks that were audible to others. We discuss the differential diagnoses of hyperkinetic palatal movements emphasizing the ongoing discussion about essential PT representing a more heterogeneous disorder than previously thought.  相似文献   
9.
PURPOSE: To compare commercial treatment-planning systems (TPS) for inverse planning (IP) and to assess constraint variations for specific IMRT indications. MATERIAL AND METHODS: For IP, OTP, XiO and BrainSCAN were used and step-and-shoot intensity-modulated radiotherapy (IMRT) delivery was assumed. Based on identical constraints, IP was performed for a prostate, head and neck, brain, and gynecologic case. IMRT plans were compared in terms of conformity/homogeneity, dose-volume histograms (DVHs), and delivery efficiency. For ten patients each of a class of indications, constraint variations were evaluated. RESULTS: IMRT plans were comparable concerning minimum target dose, homogeneity, conformity, and maximum doses to organs at risk. Larger differences were seen in dose gradients outside the target, monitor units, and segment number. Using help structures proved efficient to shape isodoses and to reduce segmentation workload. For IMRT class solutions, IP constraint variations depended on anatomic site. CONCLUSION: IP systems requiring doses as input and having objective functions based on physical parameters had a very similar performance. Constraint templates can be established for a class of IMRT indications.  相似文献   
10.
Background: Auricular acupuncture at the relaxation point has been previously shown to be an effective treatment for anxiety in the preoperative setting. The purpose of this prospective, randomized, blinded study was to determine whether auricular acupressure can reduce stress and anxiety during ambulance transport.

Methods: Patients who required ambulance transport secondary to medical conditions were randomized to receive auricular acupressure at the relaxation point (n = 17) or at a sham point (n = 19). A visual analog scale was used to assess state anxiety as well as patient anticipation of hospital medical treatment (estimated waiting period for treatment, anticipated pain during treatment, attitude toward the physicians, and treatment outcomes). These variables were assessed at baseline and on arrival to the hospital.

Results: Patients in the relaxation group reported significantly less anxiety than patients in the sham group on arrival to the hospital (visual analog scale mean +/- SD: 37.6 +/- 20.6 to 12.4 +/- 7.8 mm vs. 42.5 +/- 29.9 to 46.7 +/- 25.9 mm, respectively;P = 0.002). Similarly, patient perception of pain during treatment (mean visual analog scale +/- SD: 32.7 +/- 27.7 to 14.5 +/- 8.1 mm vs. 17.2 +/- 26.1 to 28.8 +/- 21.9 mm, respectively;P = 0.006) and treatment outcomes of their illnesses (mean visual analog scale +/- SD: 46.7 +/- 29.4 to 19.1 +/- 10.4 mm vs. 35.0 +/- 25.7 to 31.5 +/- 20.5 mm, respectively;P = 0.014) were significantly more positive in the relaxation group than in the sham group. No differences were found in the other variables assessed.  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