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   1358篇
  免费   130篇
  国内免费   5篇
耳鼻咽喉   49篇
儿科学   41篇
妇产科学   54篇
基础医学   176篇
口腔科学   26篇
临床医学   158篇
内科学   270篇
皮肤病学   5篇
神经病学   150篇
特种医学   52篇
外科学   134篇
综合类   35篇
一般理论   2篇
预防医学   137篇
眼科学   30篇
药学   106篇
中国医学   4篇
肿瘤学   64篇
  2021年   15篇
  2020年   12篇
  2019年   17篇
  2018年   30篇
  2017年   21篇
  2016年   19篇
  2015年   23篇
  2014年   28篇
  2013年   39篇
  2012年   54篇
  2011年   82篇
  2010年   35篇
  2009年   33篇
  2008年   59篇
  2007年   69篇
  2006年   50篇
  2005年   66篇
  2004年   64篇
  2003年   53篇
  2002年   45篇
  2001年   54篇
  2000年   44篇
  1999年   50篇
  1998年   29篇
  1997年   9篇
  1996年   12篇
  1995年   22篇
  1994年   17篇
  1993年   10篇
  1992年   24篇
  1991年   33篇
  1990年   26篇
  1989年   36篇
  1988年   32篇
  1987年   24篇
  1986年   18篇
  1985年   21篇
  1984年   21篇
  1983年   17篇
  1982年   11篇
  1979年   13篇
  1978年   7篇
  1976年   13篇
  1975年   7篇
  1974年   12篇
  1973年   12篇
  1971年   7篇
  1970年   6篇
  1967年   7篇
  1966年   6篇
排序方式: 共有1493条查询结果,搜索用时 15 毫秒
1.
Abstract

Media and politicians both influence public opinion and policy responses to illicit drug issues. This study examines the contribution each may have made in Australia in 2015 to the problem and politics streams of the policy process, as outlined in Kingdon’s ‘multiple streams’ heuristic, when a National Ice Taskforce responded to increased public, political and media concern about methamphetamine use. A retrospective content analysis compared the frequency and content of articles about methamphetamine in print media (N?=?639) and federal parliament speeches (N?=?158) in 2015. Peaks in the number of media articles and debates in parliament followed the establishment and interim findings of the Ice Taskforce. The findings showed that politicians more frequently framed methamphetamine use as a crisis or epidemic than the media. Both frequently portrayed cost to society as the consequence of methamphetamine use and often cited law enforcement sources. The media most frequently positioned methamphetamine users as criminal or deviant compared to politicians who did not position the user or positioned them as an addict or victim. This analysis highlights the convergence of the problem and politics streams and suggests they are not independent as first posited by Kingdon.  相似文献   
2.
European Archives of Oto-Rhino-Laryngology - A multidisciplinary team (MDT) approach to cancer management is gold-standard. With an increasing disease incidence and growing research into human...  相似文献   
3.
4.
5.
BackgroundTwo-stage revision remains the standard of care for prosthetic joint infection after total hip arthroplasty. However, there are substantial complications associated with articulating antibiotic hip spacers. Handmade and molded spacers have been shown to have higher rates of spacer fracture than antibiotic-coated prostheses (ACPs). The aim of this study is to review outcomes with an implant that is often categorized as an ACP spacer, the Zimmer-Biomet StageOne Select Femoral Spacer (ZBSO).MethodsA retrospective review was performed of 63 patients who underwent placement of a ZBSO. Patients were compared based on whether or not an extended trochanteric osteotomy (ETO) was performed using Fisher’s exact and t-tests.ResultsFive patients were excluded due to lack of follow-up or death shortly after stage 1 surgery, leaving 58 patients. Spacer fracture was noted in 5 of 58 patients (8.6%). Sixteen patients underwent ETO and 25.0% suffered a spacer fracture compared to 2.3% without ETO (odds ratio 13.7, P = .0248). There was no association between patient demographics or ETO length and spacer fracture. Two patients had periprosthetic fractures (3.4%) and 4 had dislocations (6.9%). Forty-nine patients (84.4%) went on to second-stage revision; of those 26.5% failed to clear the infection and required an average of 2.2 additional surgeries.ConclusionThe ZBSO spacer has overall complication rates similar to previously reported spacer series. Although the ZBSO looks like an ACP spacer, in the setting of ETO, it behaves like a molded or handmade spacer with a high rate of spacer fracture (25%) due to the small diameter of the core. This implant should be used with caution in combination with an ETO.  相似文献   
6.
7.
8.
9.
This paper describes the design and characterization of miniaturized optofluidic devices for sensing based on integrating collimating optical fibers with custom microfluidic chips. The use of collimating graded-index fiber (GIF) tips allows for effective fiber-channel-fiber interfaces to be realized when compared with using highly-divergent standard single-mode fiber (SMF). The reduction in both beam divergence and insertion losses for the GIF configuration compared with SMF was characterized for a 10.0 mm channel. Absorption spectroscopy was demonstrated on chip for the measurement of red color dye (Ponceau 4R), and the detection of thiocyanate in water and artificial human saliva. The proposed optofluidic setup allows for absorption spectroscopy measurements to be performed with only 200 µL of solution which is an order of magnitude smaller than for standard cuvettes but provides a comparable sensitivity. The approach could be integrated into a lab-on-a-chip system that is compact and does not require free-space optics to perform absorption spectroscopy.  相似文献   
10.
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