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燃煤锅炉烟气脱硫技术选择探讨 总被引:1,自引:0,他引:1
简要介绍了国内外锅炉烟气脱硫技术的发展状况、目前国内外典型的烟气脱硫技术、所建装置运转状况,引进技术在国内建设的装置应用情况等,对不同工艺之间的技术优劣及工业应用条件等进行了对比分析,并提出了一些个人观点,以期为国内的用户和科研单位决策提供参考。 相似文献
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Pipeline faults like leakage and blockage always create problem for engineers. Detection of exact fault quantity and its location is necessary for smooth functioning of a plant or industry and safety of the environment. In this paper brief discussion is made on various pipeline fault detection methods viz. Vibration analysis, Pulse echo methodology, Acoustic techniques, Negative pressure wave based leak detection system, Support Vector Machine (SVM) based pipeline leakage detection, Interferometric fibre sensor based leak detection, Filter Diagonalization Method (FDM), etc. In this paper merit and demerits of all methods are discussed. It is found that these methods have been applied for specific fluids like oil, gas and water, for different layout patterns like straight and zigzag, for various lengths of pipeline like short and long and also depending on various operating conditions. Therefore, a comparison among all methods has been done based on their applicability. Among all fault detection methods, Acoustic reflectometry is found most suitable because of its proficiency to identify blockages and leakage in pipe as small as 1% of its diameter. Moreover this method is economical and applicable for straight, zigzag and long, short length pipes for low, medium and high density fluid. 相似文献
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中国环境税的研究与实践 总被引:4,自引:1,他引:4
阐述了国外(尤其是OECD国家)环境税的发展趋势,总结了我国环境税的研究和实践经验,指出中国目前还没有真正的环境税,只有几个与环境和资源有关的税种;政府和公众对环境保护认识的提高、环境问题的严重性以及环保投入的加大,将促使中国实施真正的环境税。 相似文献
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Creating an academic landscape of sustainability science: an analysis of the citation network 总被引:7,自引:7,他引:0
Yuya Kajikawa Junko Ohno Yoshiyuki Takeda Katsumori Matsushima Hiroshi Komiyama 《Sustainability Science》2007,2(2):221-231
Sustainability is an important concept for society, economics, and the environment, with thousands of research papers published
on the subject annually. As sustainability science becomes a distinctive research field, it is important to define sustainability
clearly and grasp the entire structure, current status, and future directions of sustainability science. This paper provides
an academic landscape of sustainability science by analyzing the citation network of papers published in academic journals.
A topological clustering method is used to detect the sub-domains of sustainability science. Results show the existence of
15 main research clusters: Agriculture, Fisheries, Ecological Economics, Forestry (agroforestry), Forestry (tropical rain
forest), Business, Tourism, Water, Forestry (biodiversity), Urban Planning, Rural Sociology, Energy, Health, Soil, and Wildlife.
Agriculture, Fisheries, Ecological Economics, and Forestry (agroforestry) clusters are predominant among these. The Energy
cluster is currently developing, as indicated by the age of papers in the cluster, although it has a relatively small number
of papers. These results are compared with those obtained by natural language processing. Education, Biotechnology, Medical,
Livestock, Climate Change, Welfare, and Livelihood clusters are uniquely extracted by natural language processing, because
they are common topics across clusters in the citation network. 相似文献
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Hans Schreier Sandra Brown George Kennedy Pravakar B. Shah 《Environmental management》1991,15(6):815-822
A GIS-based land evaluation model was developed to determine the food, feed, and fuelwood sufficiency of all districts in
Nepal. Resource surpluses or deficits were calculated for each district for 1981, the year for which the national land resource
data were available. Of the three resources, feed supplies were found to be the most critical. Feed deficits occurred in 57%
of all districts in 1981, while food and fuelwood deficits occurred in less than 10% of all districts. Different scenarios
were carried out for the year 2000 to estimate the magnitude of future resource deficits, assuming resource use and yields
in Nepal remain constant in the face of growing population and livestock numbers. Linking resource data with spreadsheet and
GIS systems provides a new way to understand and evaluate resources at the district and national levels. To more fully capture
the usefulness of this approach, information on rates of change in productivity and land use is needed. 相似文献
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