Trees on the move: using decision theory to compensate for climate change at the regional scale in forest social-ecological systems

Regional Environmental Change - The adaptation of social-ecological systems such as managed forests depends largely on decisions taken by forest managers who must choose among a wide range of...     

Fly ash from biomass combustion as replacement raw material and its influence on the mortars durability

Journal of Material Cycles and Waste Management - Several types of industrial solid waste have been used as byproducts in the construction and materials industries. Some of the applications seem to...     

Specific Features of Wild Boar,Sus scrofa,Rooting Activity at the Northern Boundary of Its Range in Western Siberia

Russian Journal of Ecology -     

Estimating Remediation and Contaminant Respiration Emissions for Alternatives Comparisons at Petroleum Spill Sites

Greenhouse gas emissions assessments for site cleanups typically quantify emissions associated with remediation and not those from contaminant biodegradation. Yet, at petroleum spill sites, these emissions can be significant, and some remedial actions can decrease this additional component of the environmental footprint. This article demonstrates an emissions assessment for a hypothetical site, using the following technologies as examples: excavation with disposal to a landfill, light nonaqueous‐phase liquid (LNAPL) recovery with and without recovered product recycling, passive bioventing, and monitored natural attenuation (MNA). While the emissions associated with remediation for LNAPL recovery are greater than the other considered alternatives, this technology is comparable to excavation when a credit associated with product recycling is counted. Passive bioventing, a green remedial alternative, has greater remedial emissions than MNA, but unlike MNA can decrease contaminant‐related emissions by converting subsurface methane to carbon dioxide. For the presented example, passive bioventing has the lowest total emissions of all technologies considered. This illustrates the value in estimating both remediation and contaminant respiration emissions for petroleum spill sites, so that the benefit of green remedial approaches can be quantified at the remedial alternatives selection stage rather than simply as best management practices. ©2015 Wiley Periodicals, Inc.     

冻融循环作用下尾矿砂抗剪强度和变形特性研究

为探究冻融循环后尾矿物理力学特性的变化特征,使用高低温试验箱和应变控制式三轴剪力仪对处于不同初始条件下的尾矿砂进行不排水不固结试验,揭示了尾矿砂的抗剪强度参数、不同围压条件下的变形模量与冻融循环次数、含水率之间的关系。结果表明:相同含水率条件下,随冻融循环次数增加,尾矿砂黏聚力先减小后趋于稳定,内摩擦角先增大后减小,围压100 k Pa和200 k Pa时变形模量逐渐减小,围压300 k Pa时变形模量呈现先减小后缓慢增大的趋势;相同冻融循环次数条件下,随尾矿砂含水率增加,其黏聚力先增加后减小、内摩擦角不断减小;不同围压条件下变形模量在总体上均呈现出不断减小的变化趋势,围压200 k Pa时变形模量总的衰减量最大,100k Pa次之,300 k Pa最小。