Wood materials used as a means to reduce greenhouse gases (GHGs): An examination of wooden utility poles

There has been growing concern over the build-up of greenhouse gase(GHGs) in the atmosphere, particularly carbon dioxide (CO₂), as acause of global warming. The IPCC Third Assessment Report (2001) suggests two ways in which the choice of materials could berelevant. First, some materials, particularly wood, have the advantage thatthey continue to hold carbon (C)in their cells even after being convertedto products. The implications of this feature are well researched. Second,an area that is not well researched relates to the different energyrequirements for producing similar products made with different materials. Using the findings of recent research, this paper compares the energyrequirements and C emissions of manufacturing a product using wood withthat of other materials. The case study of utility poles demonstrates thepositive C and global warming consequences of the lower energyrequirements of wood in the U.S., compared to other materials such assteel or concrete. It demonstrates that GHG emissions associated withutility poles are a small but significant percent of total US annual emissions. Wood utility poles are associated with GHG emission reductions of 163Terragrams (Tg) of CO₂ when compared with steel poles. This isabout 2.8 percent of US annual GHG emissions, which are estimated atabout 5.28 Petragrams (Pg) of CO₂ annually. Thus, the use ofwooden utility poles rather than steel results in a small but significantreduction in total US emissions.     

502清洁生产实践

分析台州市两家502企业清洁生产情况,总结经验和成效,提出进一步清洁生产潜力,促进行业节能降耗减污。     

住宅小区中水回用系统经济技术分析

中水回用作为一项保护环境、节约资源的措施,将有力地促进城市的可持续发展和加速生态城市的建设,是解决中国水资源危机的有效途径之一.文章着重对住宅小区的中水回用系统进行了经济技术分析.     

试论排污权交易在环境管理中的作用

通过对排污权交易产生的原因和作用进行分析和探讨，指出在市场经济条件下，经济手段中最具代表性的排污权交易制度，将在我国的环境管理中发挥重要作用。     

Environmental input-output model and its analysis with a focus on the solid waste management sectors

ＩｎｔｒｏｄｕｃｔｉｏｎＳｉｎｃｅｔｈｅｆｉｒｓｔｅｎｖｉｒｏｎｍｅｎｔａｌｉｎｐｕｔｏｕｔｐｕｔｍｏｄｅｌ(ＥＩＯＭ)(Ｃｕｍｂｅｒｌａｎｄ,1966)ｗａｓｅｓｔａｂｌｉｓｈｅｄｂｙｉｎｃｏｒｐｏｒａｔｉｎｇｅｎｖｉｒｏｎｍｅｎｔａｌｆａｃｔｏｒｓｉｎｔ?..     

能源资源开发与区域经济发展协调研究——以我国西北地区为例

本文探讨了能源资源富集、但经济发展相对落后的经济大区能源资源开发同地区经济协调发展的问题。侧重以我国西北地区为例,从实证的角度,阐述了能源开发对地区经济繁荣的意义和作用、富能地区经济系统的空间组织以及推动能源开发同可持续发展相互协调的区域政策要点。     

生态建设与能源结构调整并重根治呼和浩特市大气污染

呼市大气环境质量的主要污染因子是悬浮颗粒物。文章通过分析TSP的构成，说明了生态建设与能源结构调整是根治TSP浓度过高的两个主要手段。文中采用大量统计数据，科学论证了治理工程，呼市的大气污染一定能得到根治。     

新型伞形罩烟气洗涤器的性能研究

针对中小型燃煤锅炉的粉尘和二氧化硫等有害气体的污染问题,开发出一种新型伞形罩烟气洗涤器。以粉煤灰、空气和水为物系,测试了伞形罩烟气洗涤器的压降(ΔP)、除尘效率和动力消耗。实验的入口气速为10～18m/s,含尘浓度为2～22g/m3,液气比(L/G)0～0.8L/m3。结果表明:伞形罩洗涤器的ΔP较小,在250～750Pa范围内;当L/G为0.2L/m3时,除尘效率达98.8%以上,动力消耗约0.06×10-3kW.h/m3(气体约216Pa),实现节能高效的目的。     

市场经济条件下企业的安全管理

随着社会主义市场经济的建立和发展，要求企业更规范、更有效、更安全地进行生产。目前，我国的安全生产工作还面临着十分严峻的形势。所以，加强企业的安全管理，提高安全生产水平是大势所趋。分析了当前企业安全管理工作中面临的问题，对如何强化企业的安全管理提出了一些意见和建议。     

谈沸腾炉的节能增效

本文从节增效的角度谈提高沸腾炉的效率，即通过调节风量，风室风压，沸腾温度，提高锅炉热效率，节能增效。