Natural gas methane and hydrates are a chemical compound of water molecules formed under low temperature and high pressure. The decomposition of 1 m^3 of natural gas hydrates can release about 0.8 m^3 of water and 164...Natural gas methane and hydrates are a chemical compound of water molecules formed under low temperature and high pressure. The decomposition of 1 m^3 of natural gas hydrates can release about 0.8 m^3 of water and 164 m3 of natural gas. Thus, natural gas hydrates are characterized by their high-energy density and huge resource potential. It is estimated that the world＇s total natural gas hydrates resource amount is equivalent to twice the total carbon amount of the global proven conventional fuels and can meet the human energy requirement in the future for 1000 years. They are thus the first choice to replace conventional energy of petroleum and coal.展开更多
The paper discusses the effects of the digital economy on highquality urban development and its mechanism.Theoretically,the digital economy can empower high-quality development by boosting entrepreneurial vitality.Emp...The paper discusses the effects of the digital economy on highquality urban development and its mechanism.Theoretically,the digital economy can empower high-quality development by boosting entrepreneurial vitality.Empirically,the paper measures the overall level of the digital economy and high-quality development of the 222 Chinese cities at and above the prefecture level during 2011-2016,depicts the entrepreneurial vitality of the cities with the microscopic data of the business registration information and makes quantitative analysis on this basis.The result shows:Digital economy has remarkably improved high-quality development and this conclusion still exists after the robustness test selecting historical data as the instrumental variables and the Broadband China pilot policy as the quasi experiment.The analysis of the mechanism of action indicates that encouraging public entrepreneurship is an important mechanism of the digital economy to release the dividend of highquality development.Finally,thanks to the threshold model and the spatial model,it is found that the positive effect of the digital economy has the characteristics of nonlinear increment and spatial spillover of the“marginal effects.”The research of the paper stimulates the reasons for high-quality development and the understanding of the effects,mechanisms and regional differences of high-quality development empowered by the digital economy.展开更多
[ Objective] The study aims to discuss the feasibility of using a fixed biological bed to treat low-concentration organic waste gas. [ Method] A fixed biological bed was used to treat low-concentration organic waste g...[ Objective] The study aims to discuss the feasibility of using a fixed biological bed to treat low-concentration organic waste gas. [ Method] A fixed biological bed was used to treat low-concentration organic waste gas from a phosphate workshop, and then the waste gas treated was assessed by human sense of smell to determine the most economical empty bed contact time, thereby verifying the feasibility of using a fixed biolog- ical bed to treat low-concentration organic waste gas. [Result] When empty bed contact time was 60 s, the smell of the treated waste gas was acceptable, and COD value of recycled water in the fixed biological bed was essentially unchanged. It proved that organic load of the waste gas was consumed by microorganisms within 60 s. [ Conclusion] It is feasible to use a fixed biological bed to treat Iow-concantration organic waste gas from a phosphate workshop.展开更多
One of the key elements influencing the performance of a carbon trading system, are the methods of allocating the initial CO2 emissions. This paper tries to use a quantitative description method to analyze the influen...One of the key elements influencing the performance of a carbon trading system, are the methods of allocating the initial CO2 emissions. This paper tries to use a quantitative description method to analyze the influence of the different allocation methods on the level of CO2 emissions based on the seven pilot trading markets from 2009 to 2013 in China. The results show that different methods bring about various degrees of impacts, through direct and indirect constraint mechanism, influence the CO2 emission cut finally. Although due to the complexity of the direct and indirect constraint mechanism, attempting to compare the effects of different allocation methods is difficult by using the data of carbon emission cut from seven pilot markets in China, the paper shows that the allowance allocation methods, through the constraints imposed on enterprises, significantly reduce regional carbon emissions.展开更多
On June 21, the presentation ceremony for China Home textile Color Application Pilot Base took place in Rui’an Municipal Conference Center of Zhejiang province. Distinguish guests, like Mr. Yang Donghui, Vice Preside...On June 21, the presentation ceremony for China Home textile Color Application Pilot Base took place in Rui’an Municipal Conference Center of Zhejiang province. Distinguish guests, like Mr. Yang Donghui, Vice President of China National Textile and展开更多
Considering the characteristics of the UHVAC Pilot Project in China,the importance of study on electromagnetic transient overvoltage in UHVAC projects is demonstrated in this paper.Through analysis and comparison on t...Considering the characteristics of the UHVAC Pilot Project in China,the importance of study on electromagnetic transient overvoltage in UHVAC projects is demonstrated in this paper.Through analysis and comparison on the simulation programs for electromagnetic transient overvoltages,EMTP is then recommended for the UHVAC Pilot Project in China.The element models in EMTP used in simulating power frequency overvoltage and power resonance of non-entire phase operation,etc.,are introduced.The paper also points out that extra attention will be needed when simulating power frequency sequence parameters and line corona.The research outcome provides valuable references for both oversea and domestic UHVAC projects.展开更多
文摘Natural gas methane and hydrates are a chemical compound of water molecules formed under low temperature and high pressure. The decomposition of 1 m^3 of natural gas hydrates can release about 0.8 m^3 of water and 164 m3 of natural gas. Thus, natural gas hydrates are characterized by their high-energy density and huge resource potential. It is estimated that the world＇s total natural gas hydrates resource amount is equivalent to twice the total carbon amount of the global proven conventional fuels and can meet the human energy requirement in the future for 1000 years. They are thus the first choice to replace conventional energy of petroleum and coal.
基金the National Natural Science Foundation of China for the Youth(71903115)the Social Science Foundation of Bejing(No.19JDYJB026).
文摘The paper discusses the effects of the digital economy on highquality urban development and its mechanism.Theoretically,the digital economy can empower high-quality development by boosting entrepreneurial vitality.Empirically,the paper measures the overall level of the digital economy and high-quality development of the 222 Chinese cities at and above the prefecture level during 2011-2016,depicts the entrepreneurial vitality of the cities with the microscopic data of the business registration information and makes quantitative analysis on this basis.The result shows:Digital economy has remarkably improved high-quality development and this conclusion still exists after the robustness test selecting historical data as the instrumental variables and the Broadband China pilot policy as the quasi experiment.The analysis of the mechanism of action indicates that encouraging public entrepreneurship is an important mechanism of the digital economy to release the dividend of highquality development.Finally,thanks to the threshold model and the spatial model,it is found that the positive effect of the digital economy has the characteristics of nonlinear increment and spatial spillover of the“marginal effects.”The research of the paper stimulates the reasons for high-quality development and the understanding of the effects,mechanisms and regional differences of high-quality development empowered by the digital economy.
文摘[ Objective] The study aims to discuss the feasibility of using a fixed biological bed to treat low-concentration organic waste gas. [ Method] A fixed biological bed was used to treat low-concentration organic waste gas from a phosphate workshop, and then the waste gas treated was assessed by human sense of smell to determine the most economical empty bed contact time, thereby verifying the feasibility of using a fixed biolog- ical bed to treat low-concentration organic waste gas. [Result] When empty bed contact time was 60 s, the smell of the treated waste gas was acceptable, and COD value of recycled water in the fixed biological bed was essentially unchanged. It proved that organic load of the waste gas was consumed by microorganisms within 60 s. [ Conclusion] It is feasible to use a fixed biological bed to treat Iow-concantration organic waste gas from a phosphate workshop.
文摘One of the key elements influencing the performance of a carbon trading system, are the methods of allocating the initial CO2 emissions. This paper tries to use a quantitative description method to analyze the influence of the different allocation methods on the level of CO2 emissions based on the seven pilot trading markets from 2009 to 2013 in China. The results show that different methods bring about various degrees of impacts, through direct and indirect constraint mechanism, influence the CO2 emission cut finally. Although due to the complexity of the direct and indirect constraint mechanism, attempting to compare the effects of different allocation methods is difficult by using the data of carbon emission cut from seven pilot markets in China, the paper shows that the allowance allocation methods, through the constraints imposed on enterprises, significantly reduce regional carbon emissions.
文摘On June 21, the presentation ceremony for China Home textile Color Application Pilot Base took place in Rui’an Municipal Conference Center of Zhejiang province. Distinguish guests, like Mr. Yang Donghui, Vice President of China National Textile and
文摘Considering the characteristics of the UHVAC Pilot Project in China,the importance of study on electromagnetic transient overvoltage in UHVAC projects is demonstrated in this paper.Through analysis and comparison on the simulation programs for electromagnetic transient overvoltages,EMTP is then recommended for the UHVAC Pilot Project in China.The element models in EMTP used in simulating power frequency overvoltage and power resonance of non-entire phase operation,etc.,are introduced.The paper also points out that extra attention will be needed when simulating power frequency sequence parameters and line corona.The research outcome provides valuable references for both oversea and domestic UHVAC projects.
