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   10383篇
  免费   698篇
  国内免费   252篇
耳鼻咽喉   467篇
儿科学   108篇
妇产科学   71篇
基础医学   803篇
口腔科学   340篇
临床医学   931篇
内科学   736篇
皮肤病学   28篇
神经病学   1373篇
特种医学   277篇
外科学   3134篇
综合类   1302篇
预防医学   579篇
眼科学   87篇
药学   603篇
  7篇
中国医学   141篇
肿瘤学   346篇
  2024年   34篇
  2023年   211篇
  2022年   432篇
  2021年   507篇
  2020年   527篇
  2019年   419篇
  2018年   383篇
  2017年   444篇
  2016年   447篇
  2015年   415篇
  2014年   823篇
  2013年   837篇
  2012年   583篇
  2011年   618篇
  2010年   560篇
  2009年   593篇
  2008年   479篇
  2007年   523篇
  2006年   420篇
  2005年   374篇
  2004年   315篇
  2003年   242篇
  2002年   189篇
  2001年   146篇
  2000年   109篇
  1999年   89篇
  1998年   91篇
  1997年   87篇
  1996年   70篇
  1995年   48篇
  1994年   33篇
  1993年   35篇
  1992年   34篇
  1991年   27篇
  1990年   24篇
  1989年   25篇
  1988年   25篇
  1987年   14篇
  1986年   16篇
  1985年   20篇
  1984年   14篇
  1983年   9篇
  1982年   12篇
  1981年   9篇
  1980年   6篇
  1979年   6篇
  1978年   2篇
  1977年   2篇
  1976年   2篇
  1975年   2篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
目的:探讨内窥镜辅助下经口咽前路寰枢椎减压术的临床效果。方法:1998年8月~2004年8月对38例陈旧性寰枢椎脱位患者采用内窥镜辅助下经口咽前入路减压术,其中18例行一期经口咽入路减压和后路枕颈内固定术:15例行经口咽前路寰枢椎复位钢板内固定术;5例不可复型仅行经口咽前入路减压术。结果:平均随访38个月(6~96个月)。术后患者临床症状均明显改善,上颈段脊髓减压改善率达89.3%。发生颅内感染1例,前路钢板松脱1例。结论:与常规减压方法相比,内窥镜辅助下经口咽前路寰枢椎减压手术创伤小,操作精细、准确,术中与助手可协同操作。  相似文献   
3.
Summary The authors report 165 cases of thoraco-lumbar lesions with neurological dysfunction. All the patient were operated. They analyze the neurological and mechanical results and indicate the use of different osteosynthesis apparatus according to the type and level of lesions.Harrington's rods seem to give more precise repositioning while Roy Camille's plates give more stability. When the posterior wall of the spinal canal is intact, Kempf's compression rods can be used.Thoraxic spine injuries seem to be an indication for Harrington's rods, while lumbar injuries seem to call for Camille's plates.  相似文献   
4.
The study explored the counterfactual thinking that women with chronic and widespread pain showed in response to what they themselves considered to be particularly stressful situations. Counterfactual thinking in 125 women sick‐listed due to chronic and widespread pain was investigated in terms of structure, function and control focus. The women were asked, for each of three types of problems that they indicated in a questionnaire to affect them most strongly, to describe a typical occurrence of it and to complete a counterfactual sentence in connection with it of the type ‘If only . . .’. The majority of counterfactuals pertained to predominantly somatic problems (e.g. musculo‐skeletal problems, pain and fatigue) classified as being affective rather than preparative and self‐focused rather than external, whereas in counterfactuals relating to predominantly psychological/psychosocial problems a preparative function and an external focus were more prominent. The numbers of problems listed and the numbers of situations responded to counterfactually were positively correlated. The counterfactuals, although often related to somatic problems, generally concerned psychological or psychosocial matters such as finances and paid or unpaid work. A contextual approach to elucidating counterfactual thinking based on subjects' own experiences is seen as providing valuable insight into what bothers them most. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   
5.
OBJECTIVES: The aim of this study was to evaluate the safety and effectiveness of laparoscopic-assisted sigmoid colectomy for diverticulitis and to assess its postoperative advantages. METHODS: From 1999 to 2001, 5 patients were selectively operated on with a laparoscopic-assisted procedure for uncomplicated sigmoid diverticulitis. In the preceding period (September 1997 through December 1998), 4 patients underwent open procedures for the same pathology. The surgical indication with the same criteria was restrictive: at least 2 acute episodes had occurred that were treated with hospital admission and that were separated by an adequate period (2 months) of medical therapy. RESULTS: No conversions of laparoscopy to an open procedure were necessary. Age, sex, weight, morbidity, and mortality were similar between the 2 groups. Operative time was 180 minutes for laparoscopy and 120 minutes for laparotomy. Postoperative resumption of peristalsis was 24 hours versus 4 days, resumption of alimentation was on the second postoperative day versus the fifth postoperative day, and hospital stay was 7 days versus 12 days for laparoscopy and laparotomy, respectively. CONCLUSION: This study shows the feasibility and the advantages of elective laparoscopic-assisted colonic resection for uncomplicated sigmoid diverticulitis. The advantages of the laparoscopic approach are the lower need for analgesics and the more precocious ambulation, canalization, resumption of alimentation, and the shorter hospital stay.  相似文献   
6.
BACKGROUND: Gastric bypass is an established bariatric procedure that has undergone multiple modifications to improve its effectiveness. The side-to-side stapled technique is well recognized, but closure of the gastrotomy/enterotomy by the stapler can potentially narrow the Roux limb. Because of this, many surgeons will hand suture the closure of the gastrotomy/enterotomy. To obviate this difficulty, we inserted the linear stapler from the stomach's greater curvature, using a double-stapled anastomosis that minimized the need for hand suturing. METHODS: We performed a retrospective analysis of 307 patients undergoing this technique for laparoscopic gastric bypass. The weight loss and 30-day morbidity and mortality were tabulated and compared with those in other published series. RESULTS: Of the 307 patients, none died postoperatively. The overall 30-day morbidity rate was 15%. Two leaks from the gastrojejunostomy and 2 from the jejunojejunostomy (1.2%) developed. The mean percentage of excess weight loss was 34% at 3 months, 52% at 6 months, 73% at 1 year, 71% at 2 years, and 69% at 3 years. CONCLUSION: The greater curve approach avoids Roux limb obstruction, minimizes the need for hand suturing, and uses standard trocar incisions. Our short-term follow-up results are similar to those of series of other techniques.  相似文献   
7.
Laparoscopic colectomy is a difficult procedure with a long learning curve. We describe in this study our technique for right- and left-sided laparoscopic medial-to-lateral colectomy. The medial approach involves division of the vascular pedicle first, followed by mobilization of the mesentery toward the abdominal wall, and finally freeing of the colon along the white line of Toldt. This approach allows immediate identification of the plane between the mesocolon and the retroperitoneum and renders the dissection fast and safe. Our series of 50 consecutive laparoscopic colectomies supports this concept. We believe that surgeons familiar with this technique will have an important tool in their armamentarium to circumvent some of the challenges of laparoscopic colectomy.  相似文献   
8.
目的探讨两种单静脉入路法和动静脉双入路法治疗PDA各自的优缺点及最佳适应症,为PDA患者选择合理介入治疗方法提供依据。方法103例PDA患者经三种不同介入方法治疗,其中单静脉入路超声法37例,单静脉入路造影法14例,动静脉双入路法52例。PDA的位置、形态、大小经不同方法观察,单静脉超声法经超声观察,单静脉造影法在PDA内或降主动脉近PDA口外造影观察,动静脉双入路在主动脉弓降部侧位造影观察。选择合适型号的Amplatzer伞经股静脉建立的轨道进行封堵。术后15 min经胸超声及心脏听诊判断有无分流。术前、术后均行血流动力学测定,术后3 d、1个月复查超声心动图,观察大动脉水平有无分流及动脉导管未闭再通。结果103例患者全部一次封堵成功,技术成功率100%。术中操作平均透视时间(10.45±4.35)min,心导管检查测肺动脉收缩压由术前轻度增高[(33.2±3.11)mmHg]降为正常[(22.03±5.3)mmHg]。术后即刻所有患者心前区双期连续性杂音消失,术后无残余分流,无任何并发症发生,随访1个月未发生动脉水平分流及动脉导管再通。结论单静脉入路Amplatzer封堵器治疗动脉导管未闭简化了手术程序,不用或减少造影剂用量,缩短了操作透视时间,手术成功率高,疗效可靠,值得推广应用。  相似文献   
9.
目的 探讨在骨盆髋臼骨折中采用耻骨联合上缘横形或下腹正中切口,真骨盆内操作(Stoppa人路)的初步临床经验. 方法对2008年3月至11月问应用Stoppa入路治疗的10例骨盆髋臼骨折患者进行总结.5例骨盆患者均为Tile C型,Stoppa入路复位同定前环的高位耻骨支骨折.髋臼骨折为横行2例,双柱、T型及后柱(四边体粉碎骨折伴中心脱位)骨折各1例,单纯Stoppa入路2例,联合Kocher-Langenbeck及髂腹股沟入路3例. 结果所有骨盆骨折均复位优,所有髋臼骨折均解剖复位.Stoppa入路平均切口长度10 cm(9~12 cm),平均手术时间88 min(75~105 min),半均出血560 mL(250~800 mL),无手术并发症.7例获得4~8个月随访,功能结果均满意. 结论 Stoppa入路可以替代髂腹股沟入路治疗高位耻骨支骨折,也可单独或联合其他入路治疗髋臼骨折,具有操作简单、并发症少的优点.  相似文献   
10.
There are the problems that influence English teaching, because the learners have the wrong understandings about the target needs and learning needs. The article analyses and discusses the teaching methods on dealing with the matter. The author thinks the teachers' adjustable function counting for much more.  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