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   637篇
  免费   200篇
  国内免费   10篇
安全科学   265篇
废物处理   4篇
环保管理   54篇
综合类   318篇
基础理论   99篇
污染及防治   40篇
评价与监测   37篇
社会与环境   12篇
灾害及防治   18篇
  2025年   4篇
  2024年   17篇
  2023年   21篇
  2022年   21篇
  2021年   34篇
  2020年   35篇
  2019年   51篇
  2018年   48篇
  2017年   49篇
  2016年   41篇
  2015年   23篇
  2014年   35篇
  2013年   36篇
  2012年   64篇
  2011年   42篇
  2010年   38篇
  2009年   41篇
  2008年   31篇
  2007年   44篇
  2006年   44篇
  2005年   16篇
  2004年   29篇
  2003年   8篇
  2002年   16篇
  2001年   17篇
  2000年   14篇
  1999年   9篇
  1998年   3篇
  1997年   5篇
  1996年   3篇
  1995年   2篇
  1992年   1篇
  1981年   1篇
  1979年   1篇
  1977年   2篇
  1975年   1篇
排序方式: 共有847条查询结果,搜索用时 0 毫秒
61.
    
Objective: Our study measured the change in head injuries and deaths among motorcycle users in Cu Chi district, a suburban district of Ho Chi Minh City.

Methods: Hospital records for road traffic injuries (RTIs) were collected from the Cu Chi Trauma Centre and motorcycle-related death records were obtained from mortality registries in commune health offices. Head injury severity was categorized using the Abbreviated Injury Score (AIS). Rate ratios (RRs) were used to compare rates pre- and post-law (2005/2006–2009/2010). Cu Chi's population, stratified by year, age, and sex, was used as the denominator.

Results: Of records identifying the transportation mode at the time of injury, motorcyclists accounted for most injuries (3,035, 87%) and deaths (238, 90%). Head injuries accounted for 70% of motorcycle-related hospitalizations. Helmet use was not recorded in any death records and not in 97% of medical records. Males accounted for most injuries (73%) and deaths (88%). The median age was 28 years and 32 years for injuries and deaths, respectively. Compared to the pre-law period, rates of motorcycle injuries (RR = 0.53; 95% confidence interval [CI], 0.49–0.58), head injuries (RR = 0.35; 95% CI, 0.31–0.39), severe head injuries (RR = 0.47; 95% CI, 0.34–0.63), and deaths (RR = 0.69; 95% CI, 0.53–0.89) significantly decreased in the post-law period.

Conclusions: Rates of head injuries and deaths among motorcycle riders decreased significantly after implementation of the mandatory helmet law in Vietnam. To further examine the impact of the motorcycle helmet law, including compliance and helmet quality, further emphasis should be placed on gathering helmet use data from injured motorcyclists.  相似文献   

62.
为了保障汽车道路试验安全、提高安全管理水平,设计提出汽车道路试验安全管理体系(SMS)总方案。根据OHSAS 18001和安全标准化规范的特点分析,论证了融合两种体系建立道路试验SMS的适用性。并从政策与目标、风险管理、安全保证和安全促进四个模块阐述了该体系的搭建思路、框架内容和搭建步骤。最后,以某自主品牌车企研发中心道路试验的应用情况为例进行效果评估,结果表明:汽车道路试验SMS能有效防控风险、提升试验安全管理水平。  相似文献   
63.
    
Objective: This article discusses the characteristics and injury patterns of serious road injuries (Maximum Abbreviated Injury Scale [MAIS] 2+ inpatients) in The Netherlands.

Methods: In The Netherlands, the actual number of serious injuries is estimated by linking police data to hospital data. The distribution of serious road injuries over (1) travel mode and gender and (2) crash type and age are compared for the years 2000 and 2011. Moreover, the distribution of the injuries over the body regions is illustrated using colored injury body profiles.

Results: The number of serious injuries is higher for men than for women and increased from 16,500 in 2000 to 19,700 in 2011. In 2011, about half (51%) of the serious road injuries were due to a bicycle crash not involving a motor vehicle. The share of casualties aged 60 years and older is relatively high (43% in 2011) in these crashes. The injury body profiles show that head injuries (31%) and injuries to the lower extremities (37%) are most prevalent. Compared to other travel modes, pedestrians and riders of powered 2-wheelers relatively often sustain lower-leg injuries compared to other travel modes. Head injuries are most prevalent in cyclists who are injured in a crash with a motorized vehicle. Cyclists who are injured in a crash not involving a motor vehicle and casualties of 60 years and older relatively often include hip or upper-leg injuries.

Conclusion: The characteristics of serious road injuries differ from those of fatalities and the distribution of injuries over the body differs by travel mode, gender, and age.  相似文献   

64.
为了研究城市地下道路V形区段坡度构成对烟气扩散和重点排烟效果的影响,采用数值模拟手段,对V形区段内变坡点两侧不同坡度构成、排烟口的开启方式对烟气扩散和重点排烟效率的影响进行研究。研究结果表明:对于对称V形区段,采用重点排烟控制烟气相对容易,但对降低排烟道下方顶棚最高温度作用有限;针对非对称V形区段,烟气的自由扩散特性与变坡点两侧坡度差有关,增加大坡度侧的排烟口数量可以提高排烟效率,但要将烟气有效地控制在较小的范围内相对困难。实际运行中,应结合坡度的实际构成和烟气控制总目标,制定相应的排烟口开启策略。  相似文献   
65.
为保障信号交叉口的正常交通秩序,充分遏制机动车未按规定导向车道行驶行为,亟需探究该行为的影响因素及干预方法。以北京市内4个信号交叉口处共35 h的1 666条监控视频数据为基础,对未按规定导向车道行驶行为进行定义并将其分为9类,分别对频率较高的5类未按规定导向车道行驶行为构建二元Logit模型,以确定其关键影响因素,并据此提出干预方法。结果表明,排队车辆数、大车比例、时段、车流量、照明条件等因素会不同程度地影响5类未按规定导向车道行驶行为的发生概率,其中排队车辆数及时间因素影响最为显著。在此基础上,从交通工程设施及驾驶人安全意识角度,提出优化交叉口渠化设计及信号配时、采用智能标线、强化监管力度及完善交通管控设施、加强驾驶人安全教育4种未按规定导向车道行驶行为干预方法。  相似文献   
66.
为更加科学有效地辨识景区道路网络中的客流关键节点,以节点脆弱性为度量指标,提出1种基于FIM模型的关键节点脆弱性评价方法.以某大型公园为例,首先通过ArcGIS软件将该公园的道路网络信息转换成可编译的文本信息,经过Java枚举可行路径,然后利用嵌入FIM算法的Lingo进行优化,得出网络节点的重要度.最后综合节点容量、...  相似文献   
67.
Objectives: Motor vehicle collisions (MVCs) are a significant health burden in Saudi Arabia. The literature has consistently indicated that chronic medical conditions, such as diabetes, heart disease, stroke, obstructive sleep apnea, and neurodevelopmental disorders, increase the risk of MVCs. Therefore, assessment of driver fitness by primary care physicians (PCPs) remains a major health intervention that might reduce MVCs. We studied the practices of PCPs in assessing medical fitness to drive in at-risk patients.

Methods: We conducted a cross-sectional study of all 88 government-funded primary care centers in the city of Riyadh, Saudi Arabia. We administered a self-reported questionnaire to PCPs that inquired about their driving risk assessment for specific medical conditions.

Results: Among all PCPs and centers, 189 PCPs (63%) from 74 centers (84%) participated in our survey. The mean age of the PCPs was 40 ± 10 years, and 108 (57%) were men. The average clinical experience of the group was 13 ± 9 years. Fewer than half of PCPs considered diabetes mellitus (45%) and obstructive sleep apnea (46%) as potential risks for MVCs. Approximately 45% of PCPs did not notify any authority or relatives of potential driving issues that they noticed in their patients. Only 15% of the participants believed that PCPs were responsible for alerting authorities about their fitness to drive.

Conclusions: PCPs did not adequately assess their patients' driving history and eligibility. Efforts are needed to improve awareness among PCPs regarding the effects of chronic medical conditions on driving.  相似文献   

68.
介绍了铁路道口信号、公路交通信号并存出现矛盾时的一种解决方法及控制模式,就控制系统的组成、工作原理及特点作了论述,构成的系统具有一定的代表性。运行表明:解决了铁路道口信号与公路交通信号不兼容的问题,有效地保障了铁路道口区域过往车辆及行人的安全,取得了预期的效果。  相似文献   
69.
事故的共性原因及其行为科学预防策略   总被引:36,自引:0,他引:36  
任何事故都是有原因的,事故的原因可分为人和物两个方面,事故的严重度与事故频率间存在三角形分布规律.运用这三条安全科学基本原理和案例分析方法,分析多起不同类型事故.结果表明,事故的共性直接原因是安全知识、安全意识和安全习惯所引起的组织成员个体的不安全行为和物的不安全状态.用行为科学方法和系统化安全管理理论,制订了一个由规范组织成员个体安全行为的安全管理方案、个人行为纠正方法和安全培训组成的通用事故预防路线图,并阐述了路线图实施时所需要的组织行为分析、个人行为纠正和安全培训方法研究的最新进展.  相似文献   
70.
流动危险源毒气泄漏事故伤害模型研究   总被引:2,自引:0,他引:2  
笔者介绍了危险货物道路运输的现状和特点,阐述了进行流动危险源事故后果分析的必要性,提出了流动危险源运动时毒气泄漏事故伤害模型,并利用该模型进行了数值模拟,证明该模型分析流动危险源运动时毒气泄漏事故的后果是可行的。  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