Aerosol particles suspended in a diluted gas with non-uniform temperature distribution are expected to experience a thermophoretic force.In theoretical treatment of thermophoresis,it is usually assumed that the partic...Aerosol particles suspended in a diluted gas with non-uniform temperature distribution are expected to experience a thermophoretic force.In theoretical treatment of thermophoresis,it is usually assumed that the particle temperature is equal to the surrounding gas temperature.However,this might not always be the case.In some particular applications,the particle temperature can significantly differ from the gas temperature.In the present paper,we theoretically investigate the effect of the particle tempera-ture on the thermophoresis of nanoparticles in the free molecule regime.Theoretical formulas for the thermophoretic force and thermophoretic velocity are obtained based on the gas kinetic theory.As exam-ples,a spherical Ag nanoparticle suspended in a dilute He gas is considered,and the Rudyak-Krasnolutski potential is employed to model the gas-particle interaction.It is found that the influence of the particle temperature on the thermophoresis of nanoparticles can be significant.With increasing particle size,the error due to the equal gas-particle temperature assumption can be neglected.展开更多
Andrew Malcolm Law's intervention article,‘Historical imaginaries,historic urban branding,and the local state in China:rejuvenation discourse,manufactured heritage and simulacrascapes,presents an interdisciplinar...Andrew Malcolm Law's intervention article,‘Historical imaginaries,historic urban branding,and the local state in China:rejuvenation discourse,manufactured heritage and simulacrascapes,presents an interdisciplinary discussion on the construction,in terms of imaginaries and branding,of Chinese historic cities through an investigation of the development and interpretation of the discourse of Chinese national rejuvenation.This article closely examines heritage in Xi'an,China,although the findings and implications may also be relevant to other historic cities/towns in China,which would invite additional studies on both the discourse and practices related to heritage cities in China and across the world.展开更多
基金This work is supported by the National Natural Science Foun-dation of China(grants Nos.51776007)Beijing Nova Program of Science and Technology(No.Z19100001119033)Youth Tal-ent Support Program of Beijing Municipal Education Committee(No.CIT&TCD201904015).
文摘Aerosol particles suspended in a diluted gas with non-uniform temperature distribution are expected to experience a thermophoretic force.In theoretical treatment of thermophoresis,it is usually assumed that the particle temperature is equal to the surrounding gas temperature.However,this might not always be the case.In some particular applications,the particle temperature can significantly differ from the gas temperature.In the present paper,we theoretically investigate the effect of the particle tempera-ture on the thermophoresis of nanoparticles in the free molecule regime.Theoretical formulas for the thermophoretic force and thermophoretic velocity are obtained based on the gas kinetic theory.As exam-ples,a spherical Ag nanoparticle suspended in a dilute He gas is considered,and the Rudyak-Krasnolutski potential is employed to model the gas-particle interaction.It is found that the influence of the particle temperature on the thermophoresis of nanoparticles can be significant.With increasing particle size,the error due to the equal gas-particle temperature assumption can be neglected.
基金China National Social Sciences Fund Project New ldeas and New Methods in the Protection and Uses of ntangible Cultural Heritage in Contemporary China (19BMZ069).
文摘Andrew Malcolm Law's intervention article,‘Historical imaginaries,historic urban branding,and the local state in China:rejuvenation discourse,manufactured heritage and simulacrascapes,presents an interdisciplinary discussion on the construction,in terms of imaginaries and branding,of Chinese historic cities through an investigation of the development and interpretation of the discourse of Chinese national rejuvenation.This article closely examines heritage in Xi'an,China,although the findings and implications may also be relevant to other historic cities/towns in China,which would invite additional studies on both the discourse and practices related to heritage cities in China and across the world.
