全文获取类型
收费全文 | 112篇 |
免费 | 3篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 3篇 |
废物处理 | 10篇 |
环保管理 | 10篇 |
综合类 | 10篇 |
基础理论 | 28篇 |
污染及防治 | 43篇 |
评价与监测 | 8篇 |
社会与环境 | 5篇 |
出版年
2022年 | 5篇 |
2021年 | 1篇 |
2019年 | 3篇 |
2018年 | 1篇 |
2017年 | 5篇 |
2016年 | 5篇 |
2015年 | 2篇 |
2014年 | 4篇 |
2013年 | 18篇 |
2012年 | 6篇 |
2011年 | 11篇 |
2010年 | 4篇 |
2009年 | 8篇 |
2008年 | 4篇 |
2007年 | 4篇 |
2006年 | 2篇 |
2005年 | 5篇 |
2004年 | 2篇 |
2003年 | 5篇 |
2002年 | 3篇 |
2001年 | 5篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1985年 | 1篇 |
1982年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有117条查询结果,搜索用时 171 毫秒
21.
Lignin samples, sub-product in the Kraft process of cellulose from eucalyptus wood, were burnt in a laboratory scale furnace at different residence temperatures and with distinct fuel-rich atmospheres. The yields of CO, CO(2), eight light hydrocarbons (methane, ethylene, ethane, propylene, acetylene, butane, etc.) and 60 semi-volatile+volatile compounds (benzene, toluene, ethylbenzene, styrene, indene, naphthalene, dibenzofuran, phenanthrene, chrysene, etc.) were determined, with nominal reactor temperatures between 800 and 1100 degrees C and residence times of the volatiles evolved and formed between 4 and 7 s. The collection of the gases and volatiles evolved was carried out with a Tedlar bag and by XAD-4 resin respectively, comparing the data obtained in both cases. The emission factor (mg/kg) of the CO was between 2500 and 90000, and under the poor-oxygen atmosphere, the emission factors of many by-toxic products were greater than 100 mg/kg. A pyrolysis run was also performed, obtaining emission factors between 30 and 3000 mg/kg, facilitating its identification. The behaviour of different compounds in the combustion runs was discussed considering three groups in accordance with their stability vs. oxygen, and two groups vs. temperature. 相似文献
22.
Núñez-Delgado Avelino Álvarez-Rodríguez Esperanza Fernández-Sanjurjo María J. 《Environmental science and pollution research international》2019,26(12):11511-11513
Environmental Science and Pollution Research - 相似文献
23.
Diego Romero Jacqueline James Rodrigo Mora Carol D. Hays 《Waste management (New York, N.Y.)》2013,33(7):1659-1666
Cathode ray tube (CRT) glass is considered a hazardous material due to its lead toxicity. In addition, current disposal practices are being phased out due to their adverse environmental impacts. In this project, CRT glass was used as a fine aggregate replacement in concrete. Life-cycle material characterization was conducted by evaluating the durability and strength of the CRT-Concrete. Leaching tests were also conducted to investigate whether the material meets drinking water limits for Pb. Test results show that the plastic state of the CRT-Concrete was affected by the angularity of the glass particles. Moreover, the compressive strength of CRT-Concrete met and exceeded that of the control specimen. However, CRT-Concrete was susceptible to expansive alkali-silica reactions when more than 10% CRT replacement was used. Environmental leaching results show that lead concentrations from CRT-Concrete are below the drinking water limits depending on the CRT volume replacement and if biopolymers are used. 相似文献
24.
25.
Several studies have identified a significant relationship between trust in regulatory institutions and the extent of a hazard’s acceptability. Many, however, have overlooked the potential impact perceived risk and perceived benefit may have on the relationship. Our principal goal is to assess empirically the link between social trust in regulatory entities and the degree of public acceptability of hazards in view of interactions among social trust, perceived risk, perceived benefit and public acceptability. A survey was conducted in 2006 in three cities representative of central Mexico. A total of 356 participants answered the survey. Each participant assessed 30 hazards for perceived risk, perceived benefit, acceptability, social trust in regulatory entities, and personal knowledge. Our main finding was that social trust retained a direct as well as an indirect causal link with the degree of a hazard’s public acceptability, independent of hazard, the extent of knowledge, and the magnitude of the hazard’s perceived risk and benefit. The relationship encountered between perceived risk and acceptability was unexpected, as numerous studies have demonstrated empirically the influence perceived risk on how acceptable an activity or technology is. In our results the statistical significance of the perceived risk-acceptability relationship practically disappeared when controlled for institutional trust and perceived benefit. In other words, the net linear relationship between perceived risk and acceptability is mediated by the extent of social trust and the benefit perceived. Comparisons with several prior studies are conducted, and implications for regulatory entities are discussed. 相似文献
26.
Preparation and characterization of ceramic products by thermal treatment of sewage sludge ashes mixed with different additives 总被引:2,自引:0,他引:2
The study of the ceramic characteristics of sludge ashes, alone or mixed with additives (kaolin, montmorillonite, illitic clay, powdered flat glass) includes characterization of additives, preparation of probes (dry or wet mixed), thermal treatment (up to 1200 degrees C, except melting or deformation) and control (densities, compressive strengths and water absorption). Thermal treatment increases the density and compressive strength of probes (both parameters go through maxima, with later decreases) and decreases the absorption of water. The densification is also revealed by the evolution of the ratio of decrease of volume/loss of mass. The maximum values of compressive strengths were obtained for 25% of illitic clay, montmorillonite and glass powder. Densification concerning probes with sludge ashes alone does not occur with kaolin. Experimental data were adjusted to exponential relationships between compressive strengths and densities for every composition, and also to a general equation for all probes. The apparent density obtained was adjusted to a non-linear dependence with temperature, leading to a maximum in density and permitting calculating the temperature of occurrence of this maximum. The adjustment was not possible for probes containing kaolin, requiring presumably higher temperatures to densify. Water absorption has low values for ashes or kaolin probes, intermediate values for illite and powdered flat glass probes and high values for montmorillonite probes. Excepting with kaolin, ceramic materials with better characteristics than sludge ashes without additives were obtained at lower treatment temperatures. 相似文献
27.
François Vialard Giuseppe Simoni Denise Molina Gomes Azzedine Abourra Simona De Toffol Fabrice Bru Maria Carmen Martinez Romero Lucio Nitsch Philippe Bouhanna Livia Marcato Thomas Popowski Beatrice Grimi Jose Antonio Martínez-Conejero B. Benzacken Rita Genesio Francesca R. Grati 《黑龙江环境通报》2012,32(4):329-335
28.
Efficient and equitable design of marine protected areas in Fiji through inclusion of stakeholder‐specific objectives in conservation planning
下载免费PDF全文
![点击此处可从《Conservation biology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Robert L. Pressey Natalie C. Ban Jorge G. Álvarez‐Romero Stacy Jupiter Vanessa M. Adams 《Conservation biology》2015,29(5):1378-1389
The efficacy of protected areas varies, partly because socioeconomic factors are not sufficiently considered in planning and management. Although integrating socioeconomic factors into systematic conservation planning is increasingly advocated, research is needed to progress from recognition of these factors to incorporating them effectively in spatial prioritization of protected areas. We evaluated 2 key aspects of incorporating socioeconomic factors into spatial prioritization: treatment of socioeconomic factors as costs or objectives and treatment of stakeholders as a single group or multiple groups. Using as a case study the design of a system of no‐take marine protected areas (MPAs) in Kubulau, Fiji, we assessed how these aspects affected the configuration of no‐take MPAs in terms of trade‐offs between biodiversity objectives, fisheries objectives, and equity in catch losses among fisher stakeholder groups. The achievement of fisheries objectives and equity tended to trade‐off concavely with increasing biodiversity objectives, indicating that it is possible to achieve low to mid‐range biodiversity objectives with relatively small losses to fisheries and equity. Importantly, the extent of trade‐offs depended on the method used to incorporate socioeconomic data and was least severe when objectives were set for each fisher stakeholder group explicitly. We found that using different methods to incorporate socioeconomic factors that require similar data and expertise can result in plans with very different impacts on local stakeholders. 相似文献
29.
The objective of this work is to apply principal component analysis (PCA) and ionic impulsions to the study of the accumulation and uptake of metals in wild plants. Soil samples were taken in three locations and the following plant species were selected: Poa, Pteridium aquilinum, Diplotaxis, Plantago lanceolata and Trifolium repens. After determining contents of Na, K, Ca, Mg, Mn, Pb, Co, Ni, Cu, Cr, Zn, Cd and Fe in the plant samples and in the soils, principal component analysis was carried out for plant data treatment. Sample position maps revealed that there was no substantial differences among samples when plant species or sampling locations were used as a criteria. As the factors obtained by PCA only correlated with one or two variables, the study of accumulation patterns of metals was carried out by using ionic impulsions. The presence of large amounts of pollutants (like Cd, Cr) in plants is related to a greater assimilation of essential micronutrients in order to counteract the influence of the pollutants. 相似文献
30.
Haiganoush K. Preisler Shiyuan Zhong Annie Esperanza Timothy J. Brown Andrzej Bytnerowicz 《Environmental pollution (Barking, Essex : 1987)》2010,158(3):778-787
Data from four continuous ozone and weather monitoring sites operated by the National Park Service in Sierra Nevada, California, are used to develop an ozone forecasting model and to estimate the contribution of wildland fires on ambient ozone levels. The analyses of weather and ozone data pointed to the transport of ozone precursors from the Central Valley as an important source of pollution in these National Parks. Comparisons of forecasted and observed values demonstrated that accurate forecasts of next-day hourly ozone levels may be achieved by using a time series model with historic averages, expected local weather and modeled PM values as explanatory variables. Results on fire smoke influence indicated occurrence of significant increases in average ozone levels with increasing fire activity. The overall effect on diurnal ozone values, however, was small when compared with the amount of variability attributed to sources other than fire. 相似文献