全文获取类型
收费全文 | 152325篇 |
免费 | 31112篇 |
国内免费 | 2407篇 |
专业分类
耳鼻咽喉 | 5206篇 |
儿科学 | 5398篇 |
妇产科学 | 2440篇 |
基础医学 | 3324篇 |
口腔科学 | 1513篇 |
临床医学 | 26731篇 |
内科学 | 47468篇 |
皮肤病学 | 7477篇 |
神经病学 | 15007篇 |
特种医学 | 6464篇 |
外国民族医学 | 7篇 |
外科学 | 41164篇 |
综合类 | 245篇 |
现状与发展 | 72篇 |
预防医学 | 7089篇 |
眼科学 | 3395篇 |
药学 | 1022篇 |
中国医学 | 7篇 |
肿瘤学 | 11815篇 |
出版年
2024年 | 687篇 |
2023年 | 4815篇 |
2022年 | 1245篇 |
2021年 | 3158篇 |
2020年 | 6059篇 |
2019年 | 2195篇 |
2018年 | 7412篇 |
2017年 | 7372篇 |
2016年 | 8441篇 |
2015年 | 8459篇 |
2014年 | 15523篇 |
2013年 | 15637篇 |
2012年 | 5491篇 |
2011年 | 5498篇 |
2010年 | 10353篇 |
2009年 | 14267篇 |
2008年 | 5818篇 |
2007年 | 4023篇 |
2006年 | 6476篇 |
2005年 | 3750篇 |
2004年 | 3003篇 |
2003年 | 1990篇 |
2002年 | 2065篇 |
2001年 | 3830篇 |
2000年 | 3050篇 |
1999年 | 3253篇 |
1998年 | 3667篇 |
1997年 | 3492篇 |
1996年 | 3373篇 |
1995年 | 3217篇 |
1994年 | 1948篇 |
1993年 | 1566篇 |
1992年 | 1418篇 |
1991年 | 1440篇 |
1990年 | 1090篇 |
1989年 | 1217篇 |
1988年 | 1053篇 |
1987年 | 882篇 |
1986年 | 918篇 |
1985年 | 737篇 |
1984年 | 571篇 |
1983年 | 545篇 |
1982年 | 530篇 |
1981年 | 417篇 |
1980年 | 379篇 |
1979年 | 339篇 |
1978年 | 350篇 |
1977年 | 415篇 |
1975年 | 296篇 |
1972年 | 321篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Ingmar Fleps Pierre Guy Stephen J Ferguson Peter A Cripton Benedikt Helgason 《Journal of bone and mineral research》2019,34(10):1837-1850
The majority of hip fractures in the elderly are the result of a fall from standing or from a lower height. Current injury models focus mostly on femur strength while neglecting subject-specific loading. This article presents an injury modeling strategy for hip fractures related to sideways falls that takes subject-specific impact loading into account. Finite element models (FEMs) of the human body were used to predict the experienced load and the femoral strength in a single model. We validated these models for their predicted peak force, effective pelvic stiffness, and fracture status against matching ex vivo sideways fall impacts (n = 11) with a trochanter velocity of 3.1 m/s. Furthermore, they were compared to sideways impacts of volunteers with lower impact velocities that were previously conducted by other groups. Good agreement was found between the ex vivo experiments and the FEMs with respect to peak force (root mean square error [RMSE] = 10.7%, R2 = 0.85) and effective pelvic stiffness (R2 = 0.92, RMSE = 12.9%). The FEMs were predictive of the fracture status for 10 out of 11 specimens. Compared to the volunteer experiments from low height, the FEMs overestimated the peak force by 25% for low BMI subjects and 8% for high BMI subjects. The effective pelvic stiffness values that were derived from the FEMs were comparable to those derived from impacts with volunteers. The force attenuation from the impact surface to the femur ranged between 27% and 54% and was highly dependent on soft tissue thickness (R2 = 0.86). The energy balance in the FEMS showed that at the time of peak force 79% to 93% of the total energy is either kinetic or was transformed to soft tissue deformation. The presented FEMs allow for direct discrimination between fracture and nonfracture outcome for sideways falls and bridge the gap between impact testing with volunteers and impact conditions representative of real life falls. © 2019 American Society for Bone and Mineral Research. 相似文献
2.
3.
4.
5.
Interprofessional collaboration and communication in nursing homes: a qualitative exploration of problems in medical care for nursing home residents – study protocol 下载免费PDF全文
6.
7.
Lois Isaksen MD 《Academic emergency medicine》2015,22(9):1125-1126
8.
9.
10.
Maaike van Gerwen MD Naomi Alpert MS Raja Flores MD Emanuela Taioli MD PhD 《American journal of industrial medicine》2020,63(2):115-120
The association between asbestos exposure, mainly in occupational settings, and malignant mesothelioma has been well established; this has prompted several countries to establish mesothelioma epidemiologic surveillance programs often at the request of national agencies. This review compares currently existing mesothelioma registries worldwide to develop a concept model for a US real-time case capture mesothelioma registry. Five countries were identified with a mesothelioma specific registry, including Italy, France, UK, Australia, and South Korea. All, except the UK, used interviews to collect exposure data. Linkage with the national death index was available or was in future plans for all registries. The registries have limited information on treatment, quality of life, and other patient-centered outcomes such as symptoms and pain management. To thoroughly collect exposure data, “real-time” enrollment is preferable; to maximize the capture of mesothelioma cases, optimal coverage, and a simplified consent process are needed. 相似文献