首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   387篇
  免费   42篇
  国内免费   5篇
儿科学   1篇
妇产科学   1篇
基础医学   29篇
口腔科学   3篇
临床医学   28篇
内科学   71篇
神经病学   17篇
特种医学   13篇
外科学   20篇
综合类   35篇
预防医学   179篇
眼科学   7篇
药学   13篇
中国医学   2篇
肿瘤学   15篇
  2023年   9篇
  2022年   3篇
  2021年   16篇
  2020年   23篇
  2019年   15篇
  2018年   16篇
  2017年   16篇
  2016年   11篇
  2015年   18篇
  2014年   28篇
  2013年   41篇
  2012年   21篇
  2011年   22篇
  2010年   18篇
  2009年   17篇
  2008年   23篇
  2007年   22篇
  2006年   17篇
  2005年   15篇
  2004年   9篇
  2003年   11篇
  2002年   13篇
  2001年   5篇
  2000年   8篇
  1999年   6篇
  1998年   3篇
  1997年   5篇
  1996年   1篇
  1995年   2篇
  1994年   5篇
  1992年   1篇
  1991年   2篇
  1990年   4篇
  1989年   2篇
  1988年   2篇
  1984年   1篇
  1982年   1篇
  1978年   1篇
  1977年   1篇
排序方式: 共有434条查询结果,搜索用时 46 毫秒
91.
92.
目的了解北京市出租车司机膳食结构与饮食行为,为改善出租车司机的营养健康状况提供科学依据。方法采用方便抽样的方法,在北京首都机场T3航站楼地下停车场候机排队的出租车中随机抽取1052人作为调查对象。采用问卷调查的方法收集司机的饮食行为、膳食结构等信息。结果 21.8%的出租车司机出车时3餐均在外就餐,郊区司机3餐进食时长低于城区司机。出租车司机不吃早餐、午餐、晚餐的比例分别是10.5%、4.4%和14.8%。出租车司机出车时午餐和晚餐的构成主要是"主食+荤菜+素菜",较少司机选择加入水果,尤其是午餐。干净卫生和能吃饱是司机们选择就餐环境时考虑的主要因素,仅有少部分司机在选择午餐(20.4%)或晚餐(27.4%)时会考虑营养因素。结论北京市出租车司机特别是郊区司机,目前仍存在饮食不规律、3餐分配及膳食结构不合理的现象。  相似文献   
93.
94.
In South Africa, the minibus taxi drivers are largely becoming another high-risk category in the HIV and AIDS epidemic. Although previous studies have shown that knowledge of HIV and AIDS is relatively high among the taxi drivers it is still not clear how this sub-population perceive the support rendered to them with regard to HIV and AIDS prevention strategies. This study aimed to focus on this atypical workplace and explore the KwaZulu-Natal, minibus taxi drivers' perceptions on HIV and AIDS. In this study, qualitative methods were utilized to determine the minibus taxi drivers' understanding of HIV and AIDS infection, HIV prevention strategies, existing support strategies and effects of HIV and AIDS on the taxi industry. Focus-group discussions were conducted, to collect data. The results showed that even though the taxi drivers had some understanding on HIV and AIDS there was still a dire need for interventions that were geared towards addressing HIV-related needs of the drivers in this industry.  相似文献   
95.
DNA integrity was investigated in the lymphocytes of 50 bus drivers, 20 garagemen and 50 controls using the comet assay with excision repair enzymes. In parallel, 8-oxo-7,8-dihydro-2′-deoxyguanosine and 15-F2t-isoprostane levels in the urine and protein carbonyl levels in the plasma were assessed as markers of oxidative damage to DNA, lipids and proteins. Exposure to carcinogenic polycyclic aromatic hydrocarbons (cPAHs) and volatile compounds was measured by personal samplers for 48 and 24 h, respectively, before the collection of biological specimens. Both exposed groups exhibited a higher levels of DNA instability and oxidative damage to biological macromolecules than the controls. The incidence of oxidized lesions in lymphocyte DNA, but not the urinary levels of 8-oxodG, correlated with exposure to benzene and triglycerides increased this damage. Oxidative damage to lipids and proteins was associated with exposure to cPAHs and the lipid peroxidation levels positively correlated with age and LDL cholesterol, and negatively with vitamin C. The carriers of at least one variant hOGG1 (Cys) allele tended to higher oxidative damage to lymphocyte DNA than those with the wild genotype, while XPD23 (Gln/Gln) homozygotes were more susceptible to the induction of DNA strand breaks. In contrast, GSTM1 null variant seemed to protect DNA integrity.  相似文献   
96.
林芬  邱坚卫  温虹 《职业与健康》2010,26(12):1341-1342
目的了解长途汽车驾驶员的健康状况,为采取相应的卫生防护措施提供依据。方法对广东省汕头市188名长途汽车驾驶员的健康状况进行调查,并选取对照组进行比较。结果长途汽车驾驶员在神经系统、心血管系统、消化系统等的自觉症状发生率明显高于对照组,两组差异有统计学意义(P0.01或P0.05)。血压升高和心电图异常检出率分别为25.5%和19.7%,高于对照组(8.7%和8.2%),两组差异有统计学意义(P0.01)。结论长途汽车驾驶对驾驶员的健康存在着一定的影响,应改善工作条件,加强健康监护。  相似文献   
97.
袁骏毅  陈璨 《中国医疗设备》2020,(3):101-103,119
目的建设互联网时代下医院的统一支付管理,实现对移动应用的技术支撑,优化患者的就医流程体验。方法以上海市胸科医院为研究对象,构建基于企业服务总线(Enterprise Service Bus,ESB)的平台,选取使用前后的数据作为参照组和观察组,对实施效果进行实证分析。结果随着EBS平台的上线使用,为异构的移动端软件提供了25.1万次支付服务,移动支付占比显著上升,财务单边账发生概率明显下降。结论平台的建设扩展了移动应用场景,保障了财务部门对资金安全的监管,为医疗机构加强移动支付管理提供了参考依据。  相似文献   
98.
Background: Low ridership of public transit buses among wheeled mobility device users suggests the need to identify vehicle design conditions that are either particularly accommodating or challenging. The objective of this study was to determine the effects of low-floor bus interior seating configuration and passenger load on wheeled mobility device user-reported difficulty, overall acceptability and design preference.

Methods: Forty-eight wheeled mobility users evaluated three interior design layouts at two levels of passenger load (high vs. low) after simulating boarding and disembarking tasks on a static full-scale low-floor bus mockup.

Results: User self-reports of task difficulty, acceptability and design preference were analyzed across the different test conditions. Ramp ascent was the most difficult task for manual wheelchair users relative to other tasks. The most difficult tasks for users of power wheelchairs and scooters were related to interior circulation, including moving to the securement area, entry and positioning in the securement area and exiting the securement area. Boarding and disembarking at the rear doorway was significantly more acceptable and preferred compared to the layouts with front doorways.

Conclusion: Understanding transit usability barriers, perceptions and preferences among wheeled mobility users is an important consideration for clinicians who recommend mobility-related device interventions to those who use public transportation.

  • Implications for Rehabilitation
  • In order to maximize community participation opportunities for wheeled mobility users, clinicians should consider potential public transit barriers during the processes of wheelchair device selection and skills training.

  • Usability barriers experienced by wheeled mobility device users on transit vehicles differ by mobility device type and vehicle configurations.

  • Full-scale environment simulations are an effective means of identifying usability barriers and design needs in people with mobility impairments and may provide an alternative model for determining readiness for using fixed route buses or eligibility for paratransit.

  相似文献   
99.
100.

Introduction

Cash payments to vulnerable households and/or individuals have increasingly garnered attention as a means to reduce poverty, improve health and achieve other development-related outcomes. Recent evidence from Malawi and Tanzania suggests that cash transfers can impact HIV-related behaviours and outcomes and, therefore, could serve as an important addition to HIV prevention efforts.

Discussion

This article reviews the current evidence on cash transfers for HIV prevention and suggests unresolved questions for further research. Gaps include (1) understanding more about the mechanisms and pathways through which cash transfers affect HIV-related outcomes; (2) addressing key operational questions, including the potential feasibility and the costs and benefits of different models of transfers and conditionality; and (3) evaluating and enhancing the wider impacts of cash transfers on health and development.

Conclusions

Ongoing and future studies should build on current findings to unpack unresolved questions and to collect additional evidence on the multiple impacts of transfers in different settings. Furthermore, in order to address questions on sustainability, cash transfer programmes need to be integrated with other sectors and programmes that address structural factors such as education and programming to promote gender equality and address HIV.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号