DUBBED the“roof of the world,”the“third pole,”and the“water tower of Asia,”the Qinghai-Tibet Plateau is of prominent ecological significance.It helps adjust the climate in Asia and the entire Northern Hemisphere...DUBBED the“roof of the world,”the“third pole,”and the“water tower of Asia,”the Qinghai-Tibet Plateau is of prominent ecological significance.It helps adjust the climate in Asia and the entire Northern Hemisphere.Upholding the principle of green development in Tibet Autonomous Region,the Chinese government has rolled out a series of measures to safeguard the ecology of Tibet.They include the Plan for the Ecological Safety Barrier Protection and Improvement in Tibet(2008-2030),the afforestation project along the Yarlung Zangbo River,Nujiang River,Lhasa River,Nianchu River,Yalong River,and Shiquan River,and the strategy and action plan for preserving biodiversity in Tibet Autonomous Region.With stringent measures and effective systems in place,Tibet sees a well-preserved ecosystem shoring up endeavors to improve people’s livelihood and sustain economic and social progress.展开更多
Copper smelting is a significant source of SO2 emission.It is important to quantify SO2 emissions from combustion sources for regulatory and control purposes in relation to air quality.The characteristics of SO2 emiss...Copper smelting is a significant source of SO2 emission.It is important to quantify SO2 emissions from combustion sources for regulatory and control purposes in relation to air quality.The characteristics of SO2 emissions from copper smelting industry in Yunnan Province,China,were examined.Analysis based on the present situation,material balance and measuring method were used to confirm SO2 emission factors of copper smelting industry.Results show that SO2 emission factors for Isa system,side blown-continuous converting system(SB-CC),blast furnace-continuous converting systems(B-CC) and blast furnace-converter blowing(B-C) are 11.69-18.64,62.44-101.4,19.43-37.88 and 45.48-81.03 kg/t(blister copper),respectively.The comprehensive emission factor based on all smelting plants is found to be in the range of 23 39.99 kg-SO2/t(blister copper) for Yunnan Province,China.The results are compared with those for discharge coefficients of industrial pollutants in the First National General Survey of Pollution Sources and the emission factor of the total amount of major pollutants.It is observed that there are some differences among emission factors.展开更多
The accurate measurement of volume fraction of oil-water two-phase flow on line is important in the oil field.This paper presents a new coaxial conductivity sensor for measuring the volume fraction of oil-water two-ph...The accurate measurement of volume fraction of oil-water two-phase flow on line is important in the oil field.This paper presents a new coaxial conductivity sensor for measuring the volume fraction of oil-water two-phase flow.This structure may get the more uniform sensitivity field and the vertical installation may get the more axial symmetry of the flow field,which improve the measurement accuracy.In order to minimize the influence of the edge effect,guard electrodes were designed.An anti-edge effect degree Ae was defined to optimize the length of the guard electrode.Different models of effective conductivity of two materials were used in calculating the oil volume fraction of oil-water two-phase flow.The experimental results indicate that Maxwell model is the best model under the condition of oil volume fraction less than 50%and the mean value of the calculation results using Maxwell model and Bruggeman model possesses higher accuracy in the range of oil volume fraction(50%-70%).The experimental results show that the sensor obtains similar measurement performance in both vertical upward and downward flow conditions.The accuracy of the sensor system is 2%when the oil volume fraction less than 50%,and the accuracy is about 5%when the oil volume fraction between 50%and 70%.展开更多
文摘DUBBED the“roof of the world,”the“third pole,”and the“water tower of Asia,”the Qinghai-Tibet Plateau is of prominent ecological significance.It helps adjust the climate in Asia and the entire Northern Hemisphere.Upholding the principle of green development in Tibet Autonomous Region,the Chinese government has rolled out a series of measures to safeguard the ecology of Tibet.They include the Plan for the Ecological Safety Barrier Protection and Improvement in Tibet(2008-2030),the afforestation project along the Yarlung Zangbo River,Nujiang River,Lhasa River,Nianchu River,Yalong River,and Shiquan River,and the strategy and action plan for preserving biodiversity in Tibet Autonomous Region.With stringent measures and effective systems in place,Tibet sees a well-preserved ecosystem shoring up endeavors to improve people’s livelihood and sustain economic and social progress.
基金Projects(KKK0201022137,KKK0201122183) supported by the Special Research Foundation of Yunnan Provincial Environmental Protection Bureau,China
文摘Copper smelting is a significant source of SO2 emission.It is important to quantify SO2 emissions from combustion sources for regulatory and control purposes in relation to air quality.The characteristics of SO2 emissions from copper smelting industry in Yunnan Province,China,were examined.Analysis based on the present situation,material balance and measuring method were used to confirm SO2 emission factors of copper smelting industry.Results show that SO2 emission factors for Isa system,side blown-continuous converting system(SB-CC),blast furnace-continuous converting systems(B-CC) and blast furnace-converter blowing(B-C) are 11.69-18.64,62.44-101.4,19.43-37.88 and 45.48-81.03 kg/t(blister copper),respectively.The comprehensive emission factor based on all smelting plants is found to be in the range of 23 39.99 kg-SO2/t(blister copper) for Yunnan Province,China.The results are compared with those for discharge coefficients of industrial pollutants in the First National General Survey of Pollution Sources and the emission factor of the total amount of major pollutants.It is observed that there are some differences among emission factors.
基金supported by National Natural Science Foundation of China(Grant No.61072101)Program for New Century Excellent Talents in University(Grant No.NCET-10-0621)the Independent Innovation Foundation of Tianjin University
文摘The accurate measurement of volume fraction of oil-water two-phase flow on line is important in the oil field.This paper presents a new coaxial conductivity sensor for measuring the volume fraction of oil-water two-phase flow.This structure may get the more uniform sensitivity field and the vertical installation may get the more axial symmetry of the flow field,which improve the measurement accuracy.In order to minimize the influence of the edge effect,guard electrodes were designed.An anti-edge effect degree Ae was defined to optimize the length of the guard electrode.Different models of effective conductivity of two materials were used in calculating the oil volume fraction of oil-water two-phase flow.The experimental results indicate that Maxwell model is the best model under the condition of oil volume fraction less than 50%and the mean value of the calculation results using Maxwell model and Bruggeman model possesses higher accuracy in the range of oil volume fraction(50%-70%).The experimental results show that the sensor obtains similar measurement performance in both vertical upward and downward flow conditions.The accuracy of the sensor system is 2%when the oil volume fraction less than 50%,and the accuracy is about 5%when the oil volume fraction between 50%and 70%.
