The quantitative structure activity relationship(QSAR) of 32 polychlorinated dibenzo-p-furans toxicity is set up with some quantum-chemical parameters calculated by HyperChem7.0 and self-designed structure descriptor ...The quantitative structure activity relationship(QSAR) of 32 polychlorinated dibenzo-p-furans toxicity is set up with some quantum-chemical parameters calculated by HyperChem7.0 and self-designed structure descriptor codes.The quantum-chemical parameters(Ehomo,Ehomo1,Elumo,logP),the structure descriptor codes(R1,R9) are selected by stepwise regression.The predicting model has a correlation coefficient(R) of 0.9451 and standard error(s) of 0.5172.The performance of the QSAR equation is tested by leave-one-out procedure(LOO),and the correlation coefficient R and standard error(s) are 0.9381 and 0.5448 respectively.It shows that the QSAR model has good stability and predictability.The study indicates that the quantum-chemical parameters(Ehomo,Ehomo1,Elumo,logP) are important factors that can influence the compound toxicity.The toxicity of the compound would reduce when R1and R9 exist.展开更多
Bandung, adopted a policy to build Waste to Energy （WTE） systems with a combustion capacity of 500 tons/day. WTE technologies will burn waste that is fed and utilized energy generated to be converted into electrical...Bandung, adopted a policy to build Waste to Energy （WTE） systems with a combustion capacity of 500 tons/day. WTE technologies will burn waste that is fed and utilized energy generated to be converted into electrical energy. This technology has the potential to reduce the volume of waste more effectively, but WTE also emit various harmful contaminants, including Polychlorinated Dibenzofurans （PCDF） and Polychlorinated Dibenzo-p-Dioxins （PCDDs）. WTE equipped with air pollution control, so that the emission of harmful contaminants can be controlled and detected continuously. This study only discusses contaminants PCDF and PCDDs, and the effect of air pollution control work against public health risks. In this study, the efficiency of air pollution control is assumed at 0%, 25%, 50%, 75%, 90% and 99%, while the public health risk assessment carried out for the projected 15 years into the future. Public health risk assessment carried out by the calculation of the health risk of carcinogenic （liver cancer）. A causal relationship between the independent variable efficiency of air pollution control with one dependent variable number of liver cancer patients, obtained the simple linear regression equation Y = 76.4592 - 0.7692X.展开更多
文摘The quantitative structure activity relationship(QSAR) of 32 polychlorinated dibenzo-p-furans toxicity is set up with some quantum-chemical parameters calculated by HyperChem7.0 and self-designed structure descriptor codes.The quantum-chemical parameters(Ehomo,Ehomo1,Elumo,logP),the structure descriptor codes(R1,R9) are selected by stepwise regression.The predicting model has a correlation coefficient(R) of 0.9451 and standard error(s) of 0.5172.The performance of the QSAR equation is tested by leave-one-out procedure(LOO),and the correlation coefficient R and standard error(s) are 0.9381 and 0.5448 respectively.It shows that the QSAR model has good stability and predictability.The study indicates that the quantum-chemical parameters(Ehomo,Ehomo1,Elumo,logP) are important factors that can influence the compound toxicity.The toxicity of the compound would reduce when R1and R9 exist.
文摘Bandung, adopted a policy to build Waste to Energy （WTE） systems with a combustion capacity of 500 tons/day. WTE technologies will burn waste that is fed and utilized energy generated to be converted into electrical energy. This technology has the potential to reduce the volume of waste more effectively, but WTE also emit various harmful contaminants, including Polychlorinated Dibenzofurans （PCDF） and Polychlorinated Dibenzo-p-Dioxins （PCDDs）. WTE equipped with air pollution control, so that the emission of harmful contaminants can be controlled and detected continuously. This study only discusses contaminants PCDF and PCDDs, and the effect of air pollution control work against public health risks. In this study, the efficiency of air pollution control is assumed at 0%, 25%, 50%, 75%, 90% and 99%, while the public health risk assessment carried out for the projected 15 years into the future. Public health risk assessment carried out by the calculation of the health risk of carcinogenic （liver cancer）. A causal relationship between the independent variable efficiency of air pollution control with one dependent variable number of liver cancer patients, obtained the simple linear regression equation Y = 76.4592 - 0.7692X.
