Dispersion parameter is an important parameter for the establishment of groundwater solute transport model.The dispersion test uses sodium chloride as a tracer,which was conducted in a site in Jilin City.The standard ...Dispersion parameter is an important parameter for the establishment of groundwater solute transport model.The dispersion test uses sodium chloride as a tracer,which was conducted in a site in Jilin City.The standard curve comparison method was used to solve the dispersion parameters of the aquifer under the natural flow field.The test results show that under the natural flow field,the longitudinal dispersion of unconfined aquifer in Jilin City is 0.400m,and the transverse dispersion is 1.933×10-5~6.557×10-3m;while the longitudinal dispersion coefficient is 0.246m2/d,the transverse dispersion coefficient is 1.191×10-5~4.039×10-3m2/d.The above results can provide an important parameter basis for the establishment of groundwater solute transport model,the accurate prediction of temporal and spatial variation of pollutant concentration in groundwater and the formulation of groundwater pollution prevention and control scheme.展开更多
In today's society, especially in the field of public transportation such as railway, safety has become a growing concern for everyone. Perfect standards and technical specifications in the field of electrical saf...In today's society, especially in the field of public transportation such as railway, safety has become a growing concern for everyone. Perfect standards and technical specifications in the field of electrical safety and interference protection are an important basis for ensuring the safety of electrified railways. Both China and Japan have very perfect standard systems in the field of electromagnetic protection, and there are many similarities and differences in their standard construction. These differences cover many aspects such as technical research, management system, operation and maintenance, etc. Therefore, based on the standards, specifications and technical regulations of the two countries, it is hoped to study the similarities and differences of grounding, EMF (electromagnetic radiation and environmental assessment), lightning protection and other aspects in the field of electromagnetic protection of electrified railway between the two countries, and to promote the improvement and progress of the relevant standard systems.展开更多
基金National Joint Foundation for Natural Science Focus(Project No.:U 19A20107).
文摘Dispersion parameter is an important parameter for the establishment of groundwater solute transport model.The dispersion test uses sodium chloride as a tracer,which was conducted in a site in Jilin City.The standard curve comparison method was used to solve the dispersion parameters of the aquifer under the natural flow field.The test results show that under the natural flow field,the longitudinal dispersion of unconfined aquifer in Jilin City is 0.400m,and the transverse dispersion is 1.933×10-5~6.557×10-3m;while the longitudinal dispersion coefficient is 0.246m2/d,the transverse dispersion coefficient is 1.191×10-5~4.039×10-3m2/d.The above results can provide an important parameter basis for the establishment of groundwater solute transport model,the accurate prediction of temporal and spatial variation of pollutant concentration in groundwater and the formulation of groundwater pollution prevention and control scheme.
文摘In today's society, especially in the field of public transportation such as railway, safety has become a growing concern for everyone. Perfect standards and technical specifications in the field of electrical safety and interference protection are an important basis for ensuring the safety of electrified railways. Both China and Japan have very perfect standard systems in the field of electromagnetic protection, and there are many similarities and differences in their standard construction. These differences cover many aspects such as technical research, management system, operation and maintenance, etc. Therefore, based on the standards, specifications and technical regulations of the two countries, it is hoped to study the similarities and differences of grounding, EMF (electromagnetic radiation and environmental assessment), lightning protection and other aspects in the field of electromagnetic protection of electrified railway between the two countries, and to promote the improvement and progress of the relevant standard systems.
