全文获取类型
收费全文 | 1037439篇 |
免费 | 74928篇 |
国内免费 | 2263篇 |
专业分类
耳鼻咽喉 | 15323篇 |
儿科学 | 31305篇 |
妇产科学 | 30382篇 |
基础医学 | 147208篇 |
口腔科学 | 30846篇 |
临床医学 | 89107篇 |
内科学 | 195722篇 |
皮肤病学 | 21105篇 |
神经病学 | 80294篇 |
特种医学 | 44964篇 |
外国民族医学 | 259篇 |
外科学 | 162716篇 |
综合类 | 25634篇 |
现状与发展 | 2篇 |
一般理论 | 264篇 |
预防医学 | 82071篇 |
眼科学 | 24405篇 |
药学 | 76692篇 |
2篇 | |
中国医学 | 1720篇 |
肿瘤学 | 54609篇 |
出版年
2018年 | 10631篇 |
2017年 | 9452篇 |
2016年 | 9501篇 |
2015年 | 12268篇 |
2014年 | 15111篇 |
2013年 | 19881篇 |
2012年 | 31792篇 |
2011年 | 28002篇 |
2010年 | 15840篇 |
2009年 | 16628篇 |
2008年 | 24335篇 |
2007年 | 27068篇 |
2006年 | 27175篇 |
2005年 | 34538篇 |
2004年 | 35572篇 |
2003年 | 30466篇 |
2002年 | 25026篇 |
2001年 | 39596篇 |
2000年 | 37891篇 |
1999年 | 35894篇 |
1998年 | 9672篇 |
1997年 | 8778篇 |
1996年 | 8788篇 |
1992年 | 32724篇 |
1991年 | 32388篇 |
1990年 | 32160篇 |
1989年 | 30889篇 |
1988年 | 28981篇 |
1987年 | 28458篇 |
1986年 | 27005篇 |
1985年 | 25793篇 |
1984年 | 19606篇 |
1983年 | 16574篇 |
1982年 | 9731篇 |
1981年 | 8879篇 |
1980年 | 8419篇 |
1979年 | 20054篇 |
1978年 | 14212篇 |
1977年 | 11743篇 |
1976年 | 10741篇 |
1975年 | 12387篇 |
1974年 | 15460篇 |
1973年 | 14656篇 |
1972年 | 14030篇 |
1971年 | 13205篇 |
1970年 | 12586篇 |
1969年 | 12156篇 |
1968年 | 10978篇 |
1967年 | 10254篇 |
1966年 | 9446篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
W. Dalton Dietrich 《Topics in spinal cord injury rehabilitation》2015,21(2):174-187
It was an honor for me to present the 2014 G. Heiner Sell Memorial Lecture at the annual American Spinal Injury Association (ASIA) meeting in San Antonio. For this purpose, I provided a comprehensive review of the scope of research targeting discovery and translational and clinical investigations into spinal cord injury (SCI) research. Indeed, these are exciting times in the area of spinal cord research and clinical initiatives. Many laboratories and clinical programs throughout the world are publishing data related to the pathophysiology of SCI and new strategies for protecting and promoting recovery in both animal models and humans. For this lecture, several topics were discussed including neuroprotective and reparative strategies, neurorehabilitation, quality of life issues, and future directions. In the area of neuroprotection, pathophysiological events that may be targeted with therapeutic strategies, including pharmacological and targeted temperature management were reviewed. For reparative approaches, the importance of both intrinsic and extrinsic mechanisms of axonal regeneration was highlighted. Various cell therapies currently being tested in preclinical and clinical arenas were reviewed as well as ongoing US Food and Drug Administration approved trials for SCI patients. Neurorehabilitation is an evolving research field with locomotive training strategies, electrical stimulation, and brain-machine interface programs targeting various types of SCI. The importance of testing combination approaches including neuroprotective, reparative, and rehabilitative strategies to maximize recovery mechanisms was therefore emphasized. Finally, quality of life issues that affect thousands of individuals living with paralysis were also presented. Future directions and specific obstacles that require attention as we continue to move the SCI field forward were discussed. 相似文献
103.
María Cabrerizo Gloria Trallero María José Pena Amaia Cilla Gregoria Megias Carmen Mu?oz-Almagro Eva Del Amo Diana Roda Ana Isabel Mensalvas Antonio Moreno-Docón Juan García-Costa Nuria Rabella Manuel Ome?aca María Pilar Romero Sara Sanbonmatsu-Gámez Mercedes Pérez-Ruiz María José Santos-Mu?oz Cristina Calvo And the study group of “Enterovirus parechovirus infections in children under ?years-old Spain” PI- 《European journal of pediatrics》2015,174(11):1511-1516
104.
Carlos A. ávila-Orta Zoe V. Qui?ones-Jurado Miguel A. Waldo-Mendoza Erika A. Rivera-Paz Víctor J. Cruz-Delgado José M. Mata-Padilla Pablo González-Morones Ronald F. Ziolo 《Materials》2015,8(11):7900-7912
Isotactic polypropylenes (iPP) with different melt flow indexes (MFI) were used to fabricate nanocomposites (NCs) with 10 wt % loadings of multi-wall carbon nanotubes (MWCNTs) using ultrasound-assisted extrusion methods to determine their effect on the morphology, melt flow, and electrical properties of the NCs. Three different types of iPPs were used with MFIs of 2.5, 34 and 1200 g/10 min. Four different NC fabrication methods based on melt extrusion were used. In the first method melt extrusion fabrication without ultrasound assistance was used. In the second and third methods, an ultrasound probe attached to a hot chamber located at the exit of the die was used to subject the sample to fixed frequency and variable frequency, respectively. The fourth method is similar to the first method, with the difference being that the carbon nanotubes were treated in a fluidized air-bed with an ultrasound probe before being used in the fabrication of the NCs with no ultrasound assistance during extrusion. The samples were characterized by MFI, Optical microscopy (OM), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), electrical surface resistivity, and electric charge. MFI decreases in all cases with addition of MWCNTs with the largest decrease observed for samples with the highest MFI. The surface resistivity, which ranged from 1013 to 105 Ω/sq, and electric charge, were observed to depend on the ultrasound-assisted fabrication method as well as on the melt flow index of the iPP. A relationship between agglomerate size and area ratio with electric charge was found. Several trends in the overall data were identified and are discussed in terms of MFI and the different fabrication methods. 相似文献
105.
106.
107.
Jeroen M. van de Pol Jurjen G. Geljon Svetlana V. Belitser Geert W.J. Frederix Anke M. Hövels Marcel L. Bouvy 《Research in social & administrative pharmacy》2019,15(1):70-76
Introduction
The nature of community pharmacy is changing, shifting from the preparation and distribution of medicines to the provision of cognitive pharmaceutical services (CPS); however, often the provision of traditional services leaves little time for innovative services. This study investigated the time community pharmacists spend on the tasks and activities of daily practice and to what extent they are able to implement CPS-related services in daily practice.Methods
Self-reporting work sampling was used to register the activities of community pharmacists. A smartphone application, designed specifically for this purpose, alerted participants to register their current activity five times per working day for 6 weeks. Participants also completed an online survey about baseline characteristics.Results
Ninety-one Dutch community pharmacists provided work-sampling data (7848 registered activities). Overall, 51.5% of their time was spent on professional activities, 35.4% on semi-professional activities, and 13.1% on non-professional activities. The proportion of time devoted to CPS decreased during the workweek, whereas the time spent on traditional task increased.Discussion and conclusion
This study shows it is feasible to collect work-sampling data using smartphone technology. Community pharmacists spent almost half of their time on semi-professional and non-professional activities, activities that could be delegated to other staff members. In practice, the transition to CPS is hampered by competing traditional tasks, which prevents community pharmacists from profiling themselves as pharmaceutical experts in daily practice. 相似文献108.
109.
110.