全文获取类型
收费全文 | 28707篇 |
免费 | 2449篇 |
国内免费 | 56篇 |
专业分类
耳鼻咽喉 | 432篇 |
儿科学 | 1070篇 |
妇产科学 | 693篇 |
基础医学 | 3730篇 |
口腔科学 | 684篇 |
临床医学 | 2848篇 |
内科学 | 5184篇 |
皮肤病学 | 617篇 |
神经病学 | 2829篇 |
特种医学 | 861篇 |
外科学 | 4081篇 |
综合类 | 621篇 |
一般理论 | 34篇 |
预防医学 | 2773篇 |
眼科学 | 727篇 |
药学 | 1867篇 |
中国医学 | 22篇 |
肿瘤学 | 2139篇 |
出版年
2022年 | 177篇 |
2021年 | 336篇 |
2020年 | 255篇 |
2019年 | 425篇 |
2018年 | 486篇 |
2017年 | 395篇 |
2016年 | 416篇 |
2015年 | 499篇 |
2014年 | 656篇 |
2013年 | 1187篇 |
2012年 | 1482篇 |
2011年 | 1637篇 |
2010年 | 952篇 |
2009年 | 886篇 |
2008年 | 1603篇 |
2007年 | 1621篇 |
2006年 | 1652篇 |
2005年 | 1597篇 |
2004年 | 1489篇 |
2003年 | 1413篇 |
2002年 | 1358篇 |
2001年 | 553篇 |
2000年 | 525篇 |
1999年 | 554篇 |
1998年 | 394篇 |
1997年 | 323篇 |
1996年 | 306篇 |
1995年 | 271篇 |
1994年 | 280篇 |
1993年 | 280篇 |
1992年 | 410篇 |
1991年 | 393篇 |
1990年 | 396篇 |
1989年 | 364篇 |
1988年 | 313篇 |
1987年 | 270篇 |
1986年 | 336篇 |
1985年 | 299篇 |
1984年 | 303篇 |
1983年 | 264篇 |
1982年 | 307篇 |
1981年 | 263篇 |
1980年 | 216篇 |
1979年 | 237篇 |
1978年 | 180篇 |
1977年 | 186篇 |
1976年 | 178篇 |
1975年 | 172篇 |
1974年 | 202篇 |
1973年 | 167篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Dongbing Lai Emma C. Johnson Sarah Colbert Gayathri Pandey Grace Chan Lance Bauer Meredith W. Francis Victor Hesselbrock Chella Kamarajan John Kramer Weipeng Kuang Sally Kuo Samuel Kuperman Yunlong Liu Vivia McCutcheon Zhiping Pang Martin H. Plawecki Marc Schuckit Jay Tischfield Leah Wetherill Yong Zang Howard J. Edenberg Bernice Porjesz Arpana Agrawal Tatiana Foroud 《Alcoholism, clinical and experimental research》2022,46(3):374-383
2.
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
3.
4.
Stefaniuk Catherine M. Schlegelmilch June Meyerson Howard J. Harding Clifford V. Maitta Robert W. 《Journal of thrombosis and thrombolysis》2022,53(4):950-953
Journal of Thrombosis and Thrombolysis - Over the last few years data from our group have indicated that α-synuclein is important in development of immune cells as well as potentially... 相似文献
5.
Michelle Linda Ferderbar Thomas E. Doyle Reza Samavi David Koff 《Journal l'Association canadienne des radiologistes》2019,70(2):119-124
Several regulatory bodies have agreed that low-dose radiation used in medical imaging is a weak carcinogen that follows a linear, non-threshold model of cancer risk. While avoiding radiation is the best course of action to mitigate risk, computed tomography (CT) scans are often critical for diagnosis. In addition to the as low as reasonably achievable principle, a more concrete method of dose reduction for common CT imaging exams is the use of a diagnostic reference level (DRL). This paper examines Canada's national DRL values from the recent CT survey and compares it to published provincial DRLs as well as the DRLs in the United Kingdom and the United States of America for the 3 most common CT exams: head, chest, and abdomen/pelvis. Canada compares well on the international scale, but it should consider using more electronic dose monitoring solutions to create a culture of dose optimization. 相似文献
6.
7.
8.
9.
Rosendo A. Rodriguez MD PhD Fraser Rubens MD MSc Carlos D. Rodriguez Howard J. Nathan MD 《Journal of neuroimaging》2006,16(2):126-132
OBJECTIVE: The application of intensity thresholds for embolus detection with transcranial Doppler (TCD) can exclude from analysis an unrecognized proportion of high-intensity transient signals (HITS))whose intensities are below the threshold. The lack of consistent threshold criteria between clinical trials may explain part of the discrepancy in the reported HITS counts. We investigated the effect of choosing different thresholds on the sensitivity and specificity of detecting HITS during cardiopulmonary bypass (CPB). METHODS: Two observers independently analyzed TCD recordings from 8 patients under CPB. Doppler signals were classified as true HITS, equivocal HITS, artifacts, and Doppler speckles according to preestablished criteria. The relative intensity of Doppler signals was measured by two different methods (TCD software vs manual). Receiver Operating Characteristic curves determined the optimal threshold for each of the two intensity methods. RESULTS: Reviewers achieved agreement in 96% of 2190 Doppler signals (kappa = 0.90). Relative intensities calculated with the TCD-software method were 3 dB (95% CI: 3.0-3.4) higher than the manual method. The optimal threshold was found at 10 dB (sensitivity: 99%; specificity: 90.8%) with the software method and at 7 dB with the manual method (sensitivity: 96%; specificity: 83%). The use of an intensity threshold 2 dB higher than the optimal increased the rejection of true HITS by 8% and 14%, respectively. CONCLUSIONS: Using intensity thresholds higher than the optimal for embolus detection decreases HITS counts. Choosing a threshold depends on the type of method used for measuring the signal intensity. Uniform threshold criteria and comparative studies between different Doppler devices are necessary for making clinical trials more comparable. 相似文献
10.