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   1700751篇
  免费   124363篇
  国内免费   3807篇
耳鼻咽喉   21817篇
儿科学   55761篇
妇产科学   46305篇
基础医学   242050篇
口腔科学   48849篇
临床医学   151717篇
内科学   334768篇
皮肤病学   38853篇
神经病学   131568篇
特种医学   64069篇
外国民族医学   242篇
外科学   258223篇
综合类   38982篇
现状与发展   4篇
一般理论   531篇
预防医学   124371篇
眼科学   40276篇
药学   123976篇
  7篇
中国医学   4495篇
肿瘤学   102057篇
  2021年   12899篇
  2019年   13600篇
  2018年   20052篇
  2017年   15320篇
  2016年   16697篇
  2015年   19090篇
  2014年   26356篇
  2013年   38093篇
  2012年   52981篇
  2011年   55762篇
  2010年   32942篇
  2009年   30863篇
  2008年   51799篇
  2007年   55136篇
  2006年   55565篇
  2005年   52845篇
  2004年   51027篇
  2003年   48460篇
  2002年   46635篇
  2001年   91936篇
  2000年   93782篇
  1999年   77123篇
  1998年   19783篇
  1997年   17340篇
  1996年   17457篇
  1995年   16803篇
  1994年   15338篇
  1993年   14111篇
  1992年   57494篇
  1991年   55372篇
  1990年   53088篇
  1989年   50863篇
  1988年   46231篇
  1987年   45007篇
  1986年   42284篇
  1985年   40061篇
  1984年   29409篇
  1983年   24952篇
  1982年   13922篇
  1979年   25579篇
  1978年   17608篇
  1977年   14929篇
  1976年   13888篇
  1975年   14586篇
  1974年   17657篇
  1973年   16961篇
  1972年   15701篇
  1971年   14471篇
  1970年   13458篇
  1969年   12549篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
92.
Graefe's Archive for Clinical and Experimental Ophthalmology -  相似文献   
93.
94.
95.
96.
IntroductionInterprofessional learning (IPL) is a vital aspect of training in radiation oncology professions, yet is rarely delivered to those professionals who work most closely together in clinical practice. Scenario-based learning using simulation facilities provides a unique opportunity to facilitate this learning and this project aimed to determine the impact and value of this initiative.MethodsSmall groups comprising post-graduate diploma pre-registration therapeutic radiographers, medical physics trainees and radiation oncology registrars were challenged with 4 plausible and challenging radiotherapy scenarios within an academic simulation centre. Pre- and post-event completion of the “Readiness for Interprofessional Learning Scale” measured impact and a Likert-style survey gathered feedback from participants.ResultsThe session increased participants' teamwork and collaboration skills as well as strengthening professional identities. Participants reported high levels of enjoyment related to collaborative working, communication and observing other professionals deploying their technical skills and specialist knowledge.ConclusionAlthough beneficial, simulated scenarios offering equal opportunities for engagement across the professions are challenging to plan and timetabling issues between the 3 groups present significant difficulties. The safe environment and unique opportunity for these groups to learn together was particularly well received and future oncology-specific simulated scenario sessions are planned with larger cohorts.Implications for practiceSimulated scenario training can be used to improve team working across the radiotherapy interprofessional team and may have wider use in other specialist interdisciplinary team development.  相似文献   
97.
A local pedicled vascularized bone flap can prevent the morbidity and cost of free bone flap surgery in small segmental bone defects or long cartilaginous defects of the head and neck. Such flaps can also be useful in patients who are high risk for surgery. The periosteal vascularity of the mandible can be used to design islanded facial artery-based bone flaps, which can be utilized to that extent. Two patients with a small segmental mandibulectomy defect and one patient with a long cricotracheal resection defect underwent reconstruction using three different designs of islanded facial artery osteomyomucosal/osseous flap (iFOMM). The patients had a minimum follow-up period of 18 months. All flaps were successful, with satisfactory healing and without any functional deficit or disease at last follow-up.  相似文献   
98.
99.
In the United States, renal cell carcinoma (RCC) incidence and the prevalence of obesity, an established risk factor for RCC, have been increasing for several decades. RCC is more common among older individuals. We sought to quantify the contribution of excess adiposity to the rising incidence of RCC among individuals 60 years or older. National Institutes of Health-American Association of Retired Persons Diet and Health Study data (n = 453 859 participants, enrolled in 1995-1996, age at enrollment 50-71 years) were used to estimate multivariable-adjusted hazard ratios (HRs) for RCC across body mass index categories and HRs associated with smoking. Population attributable fractions (PAFs) were calculated using estimated HRs and annual overweight/obesity prevalence from the National Health Interview Survey (1985-2008). PAF estimates were combined with RCC incidence from Surveillance, Epidemiology and End Results-13 to calculate annual percent changes in RCC incidence attributable (and unrelated) to overweight/obesity. We found that between 1995 and 2018, among individuals aged 60 years and older, PAF for overweight/obesity increased from 18% to 29% for all RCCs. In comparison, the PAF for smoking declined from 12% to 9%. RCC incidence increased 1.8% per year (95% confidence interval [CI] 1.5%-2.1%) overall, while RCC incidence attributable to overweight/obesity increased 3.8% per year (95%CI 3.5%-4.2%) and RCC incidence unrelated to overweight/obesity increased 1.2% per year (95% CI 0.9%-1.4%). In conclusion, overweight/obesity appears to have contributed importantly to the rising incidence of RCC in the United States since the mid-1990s. Public health interventions focused on reducing overweight and obesity could help substantially in curbing this trend.  相似文献   
100.
Graefe's Archive for Clinical and Experimental Ophthalmology - Retinal microvascular endothelial dysfunction is thought to be of importance in the development of ocular vascular diseases....  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