全文获取类型
收费全文 | 1423篇 |
免费 | 84篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 10篇 |
儿科学 | 21篇 |
妇产科学 | 23篇 |
基础医学 | 98篇 |
口腔科学 | 86篇 |
临床医学 | 170篇 |
内科学 | 182篇 |
皮肤病学 | 23篇 |
神经病学 | 69篇 |
特种医学 | 61篇 |
外科学 | 103篇 |
综合类 | 176篇 |
预防医学 | 346篇 |
眼科学 | 11篇 |
药学 | 98篇 |
中国医学 | 14篇 |
肿瘤学 | 25篇 |
出版年
2024年 | 2篇 |
2023年 | 20篇 |
2022年 | 45篇 |
2021年 | 83篇 |
2020年 | 67篇 |
2019年 | 74篇 |
2018年 | 61篇 |
2017年 | 45篇 |
2016年 | 72篇 |
2015年 | 66篇 |
2014年 | 130篇 |
2013年 | 137篇 |
2012年 | 100篇 |
2011年 | 99篇 |
2010年 | 75篇 |
2009年 | 64篇 |
2008年 | 69篇 |
2007年 | 62篇 |
2006年 | 37篇 |
2005年 | 28篇 |
2004年 | 21篇 |
2003年 | 24篇 |
2002年 | 21篇 |
2001年 | 11篇 |
2000年 | 25篇 |
1999年 | 7篇 |
1998年 | 8篇 |
1997年 | 10篇 |
1996年 | 14篇 |
1995年 | 8篇 |
1994年 | 6篇 |
1993年 | 4篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 6篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有1516条查询结果,搜索用时 171 毫秒
1.
《Journal of Science and Medicine in Sport》2021,24(11):1161-1165
ObjectivesIncreased tibial axial acceleration and reduced shock attenuation are associated with running injuries and are believed to be influenced by surface type. Trail running has increased in popularity and is thought to have softer surface properties than paved surface, but it is unclear if trail surfaces influence tibial acceleration and shock attenuation. The purpose of this study was to investigate peak triaxial and resultant tibial acceleration as well as axial and resultant shock attenuation among dirt, gravel, and paved surfaces.DesignFifteen recreational runners (12 females, 3 males, age = 27.7 ± 9.1 years) ran over dirt, gravel, and paved surfaces in a trail environment while instrumented with triaxial tibial and head accelerometers.MethodsDifferences between tri-planar peak tibial accelerations (braking, propulsion, axial, medial, lateral, and resultant) and shock attenuations (axial and resultant) among surface types were assessed with one-way ANOVAs with Bonferroni post-hoc tests.ResultsNo significant differences were found for tibial accelerations or shock attenuations among surface types (p > 0.05).ConclusionsDirt and gravel trail running surfaces do not have lower tibial accelerations or greater shock attenuation than paved surfaces. While runners are encouraged to enjoy the psychological benefits of trail running, trail surfaces do not appear to reduce loading forces associated with running-related injuries. 相似文献
2.
3.
H. Oka T. Yamamoto T. Kawazoe K. Saratani Y. Hikida 《Medical & biological engineering & computing》1988,26(3):260-266
A new impact response method using a fracture of a pencil-lead to produce an excitation pulse is proposed. Impact excitations
(rectangular pulse, triangular pulse and half-sine pulse) are strictly given in physical and mathematical definitions and
complete solutions to the impact excitations are provided for Noyes' model of the human tooth. When a relatively long triangular
pulse is applied to Noyes' model, which can express the physical characteristic of periodontal tissues, a sinusoidal damped
vibration of a single degree-of-freedom model is approximately obtained. The acceleration response is characterised by the
physical parameters (T, δ and Ao) and mechanical elements (m1, c1 and k) of which a single degree-of-freedom model is composed. By means of this method, the values of the parameters and elements
in the cases of healthy maxillary, healthy mandibular and pathological mandibular incisors are obtained. The single degree-of-freedom
model can express the high-frequency spectra of Noyes' model. The pathological tooth is characterised by a longer damped time
constant and a larger acceleration maximum. This impact response method can effectively be applied to clinical diagnosis in
view of the physical parameters and mechanical elements which have been derived. 相似文献
4.
目的了解重庆市肺结核可疑症状者就诊延迟程度,探索影响就诊延迟的主要因素,以及流动人口和常住人口间影响因素的差异。方法在重庆市流动人口较多的两个区中,对在随机抽取的20所医疗机构就诊,年龄在15岁以上的肺结核可疑症状者进行问卷调查。结果590份有效问卷中,就诊延迟中位时间为19 d;其中常住人口15 d,流动人口为22.5 d。影响就诊延迟的主要因素有:出现症状后是否愿意就诊、职业、文化程度、结核病史、恩格尔系数、就诊点远近、有无医疗保障、婚姻状况和性别。结论肺结核可疑症状者就诊延迟较为严重;影响其就诊延迟的主要因素有出现症状后是否愿意就诊等。采取综合性干预措施,有助于减少肺结核可疑症状者就诊延迟,提高结核病发现率。 相似文献
5.
The purpose of the study was to investigate the characteristics of shock attenuation during high-speed running. Maximal running
speed was identified for each subject [n=8 males, 25 (SD 4.6) years; 80 (8.9) kg; 1.79 (0.06) m] as the highest speed that could be sustained for about 20 s on a
treadmill. During testing, light-weight accelerometers were securely mounted to the surface of the distal antero-medial aspect
of the leg and frontal aspect of the forehead. Subjects completed running conditions of 50, 60, 70, 80, 90, and 100% of their
maximal speeds with each condition lasting about 20 s. Stride length, stride frequency, leg and head peak impact acceleration
were recorded from the acceleration profiles. Shock attenuation was analyzed by extracting specific sections of the acceleration
profiles and calculating the ratio of head to leg power spectral densities across the 10–20 Hz frequency range. Both stride
length and stride frequency increased across speeds (P<0.05) and were correlated with running speed (stride length r=0.92, stride frequency r=0.89). Shock attenuation increased about 20% per m·s–1 across speeds (P<0.05), which was similar to the 17% increase in stride length per m·s–1. Additionally, shock attenuation was correlated with stride length (r=0.71) but only moderately correlated with stride frequency (r=0.40) across speeds. It was concluded that shock attenuation increased linearly with running speed and running kinematic
changes were characterized primarily by stride length changes. Furthermore, the change in shock attenuation was due to increased
leg not head peak impact acceleration across running speeds.
Electronic Publication 相似文献
6.
Helen Pineo Camilla Audia Daniel Black Matthew French Emily Gemmell Gina S. Lovasi James Milner Felipe Montes Yanlin Niu Carolina Prez-Ferrer Jos Siri Ruzka R. Taruc 《Journal of urban health》2021,98(3):442
Anthropogenic environmental change will heavily impact cities, yet associated health risks will depend significantly on decisions made by urban leaders across a wide range of non-health sectors, including transport, energy, housing, basic urban services, and others. A subset of planetary health researchers focus on understanding the urban health impacts of global environmental change, and how these vary globally and within cities. Such researchers increasingly adopt collaborative transdisciplinary approaches to engage policy-makers, private citizens, and other actors in identifying and evaluating potential policy solutions that will reduce environmental impacts in ways that simultaneously promote health, equity, and/or local economies—in other words, maximising ‘co-benefits’. This report presents observations from a participatory workshop focused on challenges and opportunities for urban planetary health research. The workshop, held at the 16th International Conference on Urban Health (ICUH) in Xiamen, China, in November 2019, brought together 49 participants and covered topics related to collaboration, data, and research impact. It featured research projects funded by the Wellcome Trust’s Our Planet Our Health (OPOH) programme. This report aims to concisely summarise and disseminate participants’ collective contributions to current methodological practice in urban planetary health research. 相似文献
7.
Camilla Audia Frans Berkhout George Owusu Zahidul Quayyum Samuel Agyei-Mensah 《Journal of urban health》2021,98(3):394
This paper sets out a structured process for the co-production of knowledge between researchers and societal partners and illustrates its application in an urban health equity project in Accra, Ghana. The main insight of this approach is that research and knowledge co-production is always partial, both in the sense of being incomplete, as well as being circumscribed by the interests of participating researchers and societal partners. A second insight is that project-bound societal engagement takes place in a broader context of public and policy debate. The approach to co-production described here is formed of three recursive processes: co-designing, co-analysing, and co-creating knowledge. These ‘co-production loops’ are themselves iterative, each representing a stage of knowledge production. Each loop is operationalized through a series of research and engagement practices, which we call building blocks. Building blocks are activities and interaction-based methods aimed at bringing together a range of participants involved in joint knowledge production. In practice, recursive iterations within loops may be limited due of constraints on time, resources, or attention. We suggest that co-production loops and building blocks are deployed flexibly. 相似文献
8.
Timotej Jagrič Christine Brown Tammy Boyce Vita Jagrič 《Health policy (Amsterdam, Netherlands)》2021,125(1):90-97
Policy-makers face pressures to improve lives and safeguard public finances sustainably. In this analysis, we estimate the economic importance of the health-care sector in 19 European national economies.We use input–output tables for the year 2010 and sectoral data to estimate a set of multipliers: simple, total, truncated, type I and type II multipliers for output, income, value-added, employment and import multiplier.The analysis reveals similarities in the economic importance of the health-care sector for the national economies of the observed countries. Results suggest prevailing positive effects on national economies (value-added, employment and household income) when spending on health-care sector products and services increases, especially in comparison to the effects of increases in spending in other sectors. The importance of the health-care sector is connected to countries’ levels of development; the benefits are especially promising in countries with lower levels of gross domestic product (GDP) per capita, where changes in the health-care sector have a larger impact on employment in the national economy than similar changes in more developed countries. The health-care sector therefore can play an important role as an instrument of economic policy. 相似文献
9.
目的 分析放射工作者外周血象、淋巴细胞微核及染色体畸变情况,为放射工作者职业防护和健康监测提供依据。方法 对2015年、2017年和2019年连续3次接受健康检查的127名放射工作者进行淋巴细胞微核、染色体及血象分析,将其设为放射组。另外选取133名无射线接触史的医务人员设为对照组;结果 放射组中淋巴细胞微核率和染色体畸变率高于对照组,白细胞和血小板计数低于对照组,均具有统计学意义(P < 0.05)。127名放射工作者外周血白细胞总数随着接触电离辐射时间的增长逐渐降低,染色体畸变率逐渐增加,均具有统计学意义(P < 0.05)。损害工龄大于20年的放射工作者染色体畸变率高于低工龄组,不同损害工龄之间比较无统计学意义(P > 0.05)。核医学与介入治疗工种染色体畸变率高于其他工种,具有统计学意义(P < 0.05)。结论 长时间接触低剂量电离辐射可使放射工作者白细胞总数降低和淋巴细胞染色体畸变率增加,应加强放射工作者防护措施以备降低电离辐射损伤程度,特别要加强核医学和介入治疗放射工作人员的职业防护。 相似文献
10.
21世纪卫生系统改革对卫生经济学发展的影响 总被引:2,自引:0,他引:2
该文介绍了发达国家和发展中国家在卫生改革中遇到的问题。前者有:组建医院间“战略联盟”,管理保健市场发展,卫生服务效率、公平性和可及性等。后者有:减少政府的作用,改变公共部门的组织及管理,增加卫生资金的来源及数量。这些问题引起卫生经济学界关注。第二次国际卫生经济学会会议将讨论以下专题:信息不对称及卫生保健组织间关系、卫生保健的选择,卫生及卫生服务的需求,健康及卫生服务的分布,卫生保健的经济学评价,卫生保健市场分析,健康保险,管理保健,卫生服务的产出等18个主题。 相似文献