全文获取类型
收费全文 | 145篇 |
免费 | 13篇 |
国内免费 | 18篇 |
专业分类
安全科学 | 43篇 |
废物处理 | 7篇 |
环保管理 | 26篇 |
综合类 | 55篇 |
基础理论 | 21篇 |
污染及防治 | 8篇 |
评价与监测 | 4篇 |
社会与环境 | 8篇 |
灾害及防治 | 4篇 |
出版年
2023年 | 5篇 |
2022年 | 9篇 |
2021年 | 7篇 |
2020年 | 3篇 |
2019年 | 5篇 |
2018年 | 4篇 |
2017年 | 4篇 |
2016年 | 8篇 |
2015年 | 10篇 |
2014年 | 7篇 |
2013年 | 21篇 |
2012年 | 2篇 |
2011年 | 7篇 |
2010年 | 8篇 |
2009年 | 13篇 |
2008年 | 4篇 |
2007年 | 8篇 |
2006年 | 5篇 |
2004年 | 2篇 |
2003年 | 4篇 |
2002年 | 8篇 |
2001年 | 3篇 |
2000年 | 6篇 |
1999年 | 7篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 6篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有176条查询结果,搜索用时 15 毫秒
71.
Kamal P. Kothiyal Berman Kayis 《International journal of occupational safety and ergonomics》2013,19(2):136-143
This article reports the results of an experimental study undertaken to investigate the effect of spatial arrangement of assembly board and parts bin in the normal work area on work-cycle time in manual assembly tasks. Operator performance was measured in terms of average work-cycle time taken to complete a laboratory-simulated manual assembly task. Results showed that both location and distance factors had significant effects on work-cycle time. Effect of the size of parts was also investigated in the study. Average observed work-cycle times were compared with the methods–time measurement (MTM) values. Repetitive manual assembly tasks are common in industry and are thought to lead to musculoskeletal disorders. The results of this research are important for ergonomic design of the workplace for assembly tasks, which would help to enhance operators’ efficiency. 相似文献
72.
Tahmina Khatun 《Environment, Development and Sustainability》2009,11(2):439-457
The objective of the paper is to measure environmental degradation on the basis of some selected indicators by the application
of a simple multivariate technique known as Principal Component Analysis. For this purpose the study considered six variables,
namely, GDP per capita, fuel consumption, total fertility rate, water supply, sanitation, and electricity. However, because
of unavailability of data, the variables such as technology relating to environment, waste disposal, air pollution, women/gender
issues relating to environment, corruption, democracy etc. could not be considered. The results show that principal components
explain about 62% of the variations in the level of environmental degradation. The variables like GDP per capita, fuel consumption,
water supply and electricity played a major role in classifying the countries in terms of environmental degradation compared
to the variables, sanitation and total fertility rate. The findings show that countries which have high GDP per capita, low
fuel consumption, higher percentage of people having access to water supply and sanitation as well as electricity ranked higher
in terms of environmental quality despite high fertility rate as shown by the spectacular example of Saudi Arabia. By contrast,
those countries which have low percentage of population having access to safe water and sanitation as well as electricity,
high fuel consumption and high fertility were ranked lower in terms of environmental quality despite high per capita income,
as shown by the example of Angola which is placed in lowest position among the 51 selected countries. The results also show
that correlation between poverty and environmental degradation is particularly acute in African countries where high population
growth is acting as an exacerbating factor. The study concluded that high fertility has much impact on environmental degradation
in case of poorer countries than in case of rich countries.
相似文献
Tahmina KhatunEmail: |
73.
阳极内添加阳离子交换树脂提升辊压“三合一”膜电极MFC性能 总被引:1,自引:1,他引:0
阳极-隔膜-阴极的"三合一"膜电极结构能够最大程度减小阴阳极间距,提高微生物燃料电池(microbial fuel cell,MFC)的输出功率.为进一步提高MFC性能,本研究使用非贵金属材料构建了辊压"三合一"膜电极系统,其欧姆内阻降低至3~5Ω.以乙酸钠为底物,MFC的最高功率密度达到446 m W·m-2.向阳极内添加固体小球(如聚苯乙烯球和玻璃微球)可在辊压过程中增加阳极表面和内部的大孔,强化电解液向阴极的传递从而使MFC的功率密度提升10%.添加阳离子交换树脂能够进一步强化阳极内部的质子传递,提高阴极电位,从而将功率密度提升至543 m W·m-2.此外,阳极内添加阳离子交换树脂还可提高电池运行的稳定性和库仑效率. 相似文献
74.
75.
Marino E Guijarro M Hernando C Madrigal J Díez C 《Journal of environmental management》2011,92(3):1003-1011
Prescribed burning is commonly used to prevent accumulation of biomass in fire-prone shrubland in NW Spain. However, there is a lack of knowledge about the efficacy of the technique in reducing fire hazard in these ecosystems. Fire hazard in burned shrubland areas will depend on the initial capacity of woody vegetation to recover and on the fine ground fuels existing after fire. To explore the effect that time since burning has on fire hazard, experimental tests were performed with two fuel complexes (fine ground fuels and regenerated shrubs) resulting from previous prescribed burnings conducted in a gorse shrubland (Ulex europaeus L.) one, three and five years earlier. A point-ignition source was used in burning experiments to assess ignition and initial propagation success separately for each fuel complex. The effect of wind speed was also studied for shrub fuels, and several flammability parameters were measured. Results showed that both ignition and initial propagation success of fine ground fuels mainly depended on fuel depth and were independent of time since burning, although flammability parameters indicated higher fire hazard three years after burning. In contrast, time since burning increased ignition and initial propagation success of regenerated shrub fuels, as well as the flammability parameters assessed, but wind speed had no significant effect. The combination of results of fire hazard for fine ground fuels and regenerated shrubs according to the variation in relative coverage of each fuel type after prescribed burning enabled an assessment of integrated fire hazard in treated areas. The present results suggest that prescribed burning is a very effective technique to reduce fire hazard in the study area, but that fire hazard will be significantly increased by the third year after burning. These results are valuable for fire prevention and fuel management planning in gorse shrubland areas. 相似文献
76.
依据流水线生产的特点,分析了照度水平与流水线生产安全性之间的关系,建立了照度-安全绩效模型,并进行了详细的定性分析和定量分析,对企业设计或优化照明系统,确保生产安全顺利进行具有重要的参考意义. 相似文献
77.
A Dual Fuel (LNG-Diesel) system can be applied to heavy-duty diesel trucks for achieving environmental benefits in comparison to existing diesel vehicles. Because of lack of reports about risk assessment of this technology, we performed a qualitative assessment based on a framework of some literature techniques for risk identification, analysis and evaluation. After constructing a Reliability Block Diagram (RBD) to establish the context, we conducted bow-tie analysis, Fault Tree Analysis (FTA), Failure Mode and Effects Analysis (FMEA), likelihood and consequence analysis, and used a risk matrix. We applied these methods and techniques qualitatively to identify causes (e.g. collisions), critical events (e.g. releases of natural gas), related consequences (e.g. fires and explosions), and different possible pathways from a specific cause to its consequence, and to assess some negative accident scenarios related to use and parking of the vehicle. The bow-tie analysis also allowed to make explicit barriers and controls that prevent critical events and/or mitigate consequences. Therefore, we identified a set of safety measures, including design, technical, management, and emergency actions, which shall be implemented in each step of the system's life cycle.Our risk assessment showed that the risk level of the Dual Fuel (LNG-Diesel) system is similar to the risk level of a traditional diesel system. Future research will overcome current lack of data and, therefore, permit a quantitative rating of the risk of the Dual Fuel (LNG-Diesel) system. 相似文献
78.
Development of a framework for fire risk assessment using remote sensing and geographic information system technologies 总被引:10,自引:0,他引:10
Emilio Chuvieco Inmaculada Aguado Héctor Nieto M. Pilar Martín Lara Vilar Susana Martín Juan de la Riva Francisco Rodríguez Miguel A. Herrera 《Ecological modelling》2010,221(1):46-58
Forest fires play a critical role in landscape transformation, vegetation succession, soil degradation and air quality. Improvements in fire risk estimation are vital to reduce the negative impacts of fire, either by lessen burn severity or intensity through fuel management, or by aiding the natural vegetation recovery using post-fire treatments. This paper presents the methods to generate the input variables and the risk integration developed within the Firemap project (funded under the Spanish Ministry of Science and Technology) to map wildland fire risk for several regions of Spain. After defining the conceptual scheme for fire risk assessment, the paper describes the methods used to generate the risk parameters, and presents proposals for their integration into synthetic risk indices. The generation of the input variables was based on an extensive use of geographic information system and remote sensing technologies, since the project was intended to provide a spatial and temporal assessment of risk conditions. All variables were mapped at 1 km2 spatial resolution, and were integrated into a web-mapping service system. This service was active in the summer of 2007 for semi-operational testing of end-users. The paper also presents the first validation results of the danger index, by comparing temporal trends of different danger components and fire occurrence in the different study regions. 相似文献
79.
《Process Safety and Environmental Protection》2014,92(6):879-887
The purpose of this study is to find an optimal mixture ratio of the platinum-loaded carbon catalyst and the electrolyte in a membrane electrode assembly (MEA) of a proton exchange membrane fuel cell for reducing the activation resistance, which influences the electrochemical surface area, activation polarization, and maximum power density of the MEA. First, mixture ratios of 10, 20, 40, and 60 wt% platinum-loaded carbon catalysts and electrolyte were examined. The results indicated that the fuel cell performance improved for mixing weight ratios of 1.0:2.0 in 10 wt% Pt/C, 1.0:1.8 in 20 wt% Pt/C, 1.0:1.1 in 40 wt% Pt/C, and 1.0:0.5 in 60 wt% Pt/C. Next, we evaluated the activation resistances of the MEA from the AC impedance characteristics using the optimal mixing weight ratio of the platinum-loaded carbon catalyst and the electrolyte. It was found that the activation resistances of the anode and cathode decrease with an increase in the weight ratio of platinum-loaded carbon in the catalyst layer. 相似文献
80.
Xiaoguang Chen Haixiao Huang Madhu Khanna Hayri Önal 《Journal of Environmental Economics and Management》2014
This paper develops an integrated model of the fuel and agricultural sectors to analyze the welfare and greenhouse gas emission (GHG) effects of the existing Renewable Fuel Standard (RFS), a Low Carbon Fuel Standard (LCFS) and a carbon price policy. The conceptual framework shows that these policies differ in the incentives they create for the consumption and mix of different types of biofuels and in their effects on food and fuel prices and GHG emissions. We also simulate the welfare and GHG effects of these three policies which are normalized to achieve the same level of US GHG emissions. By promoting greater production of food-crop based biofuels, the RFS is found to lead to a larger reduction in fossil fuel use but also a larger increase in food prices and a smaller reduction in global GHG emissions compared to the LCFS and carbon tax. All three policies increase US social welfare compared to a no-biofuel baseline scenario due to improved terms-of-trade, even when environmental benefits are excluded; global social welfare increases with a carbon tax but decreases with the RFS and LCFS due to the efficiency costs imposed by these policies, even after including the benefits of mitigating GHG emissions. 相似文献