全文获取类型
收费全文 | 997篇 |
免费 | 15篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 208篇 |
妇产科学 | 20篇 |
基础医学 | 98篇 |
口腔科学 | 34篇 |
临床医学 | 72篇 |
内科学 | 88篇 |
皮肤病学 | 28篇 |
神经病学 | 39篇 |
特种医学 | 37篇 |
外科学 | 117篇 |
综合类 | 22篇 |
预防医学 | 51篇 |
眼科学 | 51篇 |
药学 | 77篇 |
中国医学 | 39篇 |
肿瘤学 | 31篇 |
出版年
2023年 | 3篇 |
2022年 | 5篇 |
2021年 | 15篇 |
2020年 | 5篇 |
2019年 | 158篇 |
2018年 | 129篇 |
2017年 | 53篇 |
2016年 | 11篇 |
2015年 | 12篇 |
2014年 | 63篇 |
2013年 | 41篇 |
2012年 | 32篇 |
2011年 | 54篇 |
2010年 | 40篇 |
2009年 | 45篇 |
2008年 | 39篇 |
2007年 | 16篇 |
2006年 | 16篇 |
2005年 | 10篇 |
2004年 | 12篇 |
2003年 | 7篇 |
2002年 | 5篇 |
2001年 | 4篇 |
2000年 | 4篇 |
1999年 | 4篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1985年 | 37篇 |
1984年 | 40篇 |
1983年 | 17篇 |
1982年 | 29篇 |
1981年 | 26篇 |
1980年 | 13篇 |
1979年 | 22篇 |
1978年 | 20篇 |
1977年 | 10篇 |
1976年 | 7篇 |
1975年 | 2篇 |
排序方式: 共有1016条查询结果,搜索用时 15 毫秒
1.
《Health & place》2020
In this study we used a participatory research method, photovoice, to explore community perceptions about environmental health risks, community assets, and strengths in and around an urban, degraded watershed in Northwest Atlanta, Georgia. This watershed, formed by Proctor Creek, is a focal point for redevelopment and infrastructure investments for years to come. Using a community-based participatory research approach, 10 Proctor Creek residents (watershed researchers), and a university partner, engaged in data collection; participatory data analysis; internal discussions; translation of research findings into watershed restoration, community revitalization, remedial action, and policy solutions; and dissemination of results to fellow watershed residents, stakeholders, and decision makers. We present a conceptual model linking the watershed researchers' understanding of urban policies and practice in the Proctor Creek Watershed to environmental, neighborhood and housing conditions and their influence on health outcomes and quality of life. Engaging community members in defining their own community environmental health challenges and assets yielded the following primary themes: 1) threats to the natural environment, 2) built environment stressors that influence health, 3) blight and divestment of public resources, and 4) hope for the future. Residents’ vision for the future of the watershed - a restored creek, revitalized neighborhoods, and restored people - is fueled by a strong connection to history, memory, and sense of place. We demonstrate the value of local knowledge in identifying previously unaddressed environmental health risks in the Proctor Creek Watershed as well as solutions to reduce or eliminate them. 相似文献
2.
Image processing is a critical part of obtaining high-quality digital radiographs. Fortunately, the user of these systems does not need to understand image processing in detail, because the manufacturers provide good starting values. Because radiologists may have different preferences in image appearance, it is helpful to know that many aspects of image appearance can be changed by image processing, and a new preferred setting can be loaded into the computer and saved so that it can become the new standard processing method.Image processing allows one to change the overall optical density of an image and to change its contrast. Spatial frequency processing allows an image to be sharpened, improving its appearance. It also allows noise to be blurred so that it is less visible. Care is necessary to avoid the introduction of artifacts or the hiding of mediastinal tubes. 相似文献
3.
采用时域有限差分(FDTD)法结合遗传算法(GA)优化设计了适用于浅表生物组织高频测量的宽带同轴贴片探头,并用该探头测量了人体背部1~7GHz频带内的反射特性。优化设计出的圆形同轴贴片探头具有轴对称特点,辐射近场在生物组织中透人深、反射系数的频率响应特性好。所获得的人体背部反射特性的测量结果将为背部浅表组织电特性的重建提供有利的依据。 相似文献
4.
Ischemic contracture of the left ventricle ("stone heart") was studied utilizing a previously described stone heart model. Our studies suggest that beta-adrenergic blockade is not quantitatively as important as hypothermia in protecting ischemic myocardium. On the basis of reduced fibrillatory activity and a slight protective effect shown by electron microscopy, it would appear that combining propranolol with hypothermia may be superior to either used singly. 相似文献
5.
6.
7.
8.
9.
Hanne D. Heerkens Lisanne van Berkel Dorine S.J. Tseng Evelyn M. Monninkhof Hjalmar C. van Santvoort Jeroen Hagendoorn Inne H.M. Borel Rinkes Irene M. Lips Martijn Intven I. Quintus Molenaar 《HPB : the official journal of the International Hepato Pancreato Biliary Association》2018,20(2):188-195
Background
Surgery for pancreatic cancer yields significant morbidity and mortality risks and survival is limited. Therefore, the influence of complications on quality of life (QoL) after pancreatic surgery is important. This study compares QoL in patients with and without severe complications after surgery for pancreatic (pre-)malignancy.Methods
This prospective cohort study scored complications after pancreatic surgery according to the Clavien–Dindo system and the definitions of the International Study Group of Pancreatic Surgery. QoL was measured by the RAND36 questionnaire, the European Organization for Research and Treatment of Cancer core questionnaire (QLQ-C30) and the pancreas specific QLQ-PAN26. QoL in patients with severe complications was compared with QoL in patients with no or mild complications over a period of 12 months. Analysis was performed with linear mixed models for repeated measurements.Results
Between March 2012 and July 2016, 137 patients were included. Sixty-eight patients (50%) had at least 1 severe complication. There were no statistically significant and clinically relevant differences between both groups in QoL up to 12 months after surgery.Conclusion
In this study, no differences in QoL between patients with and without severe postoperative complications were encountered during the first 12 months after surgery for pancreatic (pre-)malignancy.10.