Based on the Huybrechts' linear-combination operator,effects of thermal lattice vibration on the effective potential of weak-coupling bipolaron in semiconductor quantum dots are studied by using the LLP variationa...Based on the Huybrechts' linear-combination operator,effects of thermal lattice vibration on the effective potential of weak-coupling bipolaron in semiconductor quantum dots are studied by using the LLP variational method and quantum statistical theory.The results show that the absolute value of the induced potential of the bipolaron increases with increasing the electron-phonon coupling strength,but decreases with increasing the temperature and the distance of electrons,respectively;the absolute value of the effective potential increases with increasing the radius of the quantum dot,electron-phonon coupling strength and the distance of electrons,respectively,but decreases with increasing the temperature;the temperature and electron-phonon interaction have the important influence on the formation and state properties of the bipolaron:the bipolarons in the bound state are closer and more stable when the electron-phonon coupling strength is larger or the temperature is lower;the confinement potential and coulomb repulsive potential between electrons are unfavorable to the formation of bipolarons in the bound state.展开更多
During the long-term construction and development process of eliminating water disasters and promoting water conservancy in traditional settlements,a set of mature strategies that have simple ecological wisdom in wate...During the long-term construction and development process of eliminating water disasters and promoting water conservancy in traditional settlements,a set of mature strategies that have simple ecological wisdom in water layout have been formed by adapting to the natural water environment and utilizing the regional water system.This study conducted a qualitative and quantitative analysis of the water layout strategies and their effects on Liukeng Village from three aspects:deciphering the water systematic pattern,calculating the spatial characteristics and quantifying the water environment,to explore the technical assistance and potential of water layout research in traditional rural settlements.The results indicated that Liukeng has an unambiguously systematic water layout pattern of source diversion,middle drainage and end purification of the water.Through 3D point cloud computing,it was shown that the site selection made accurate use of micro-topography and adopted the strategy of a multi-source water management.It formed an organic water system pattern,which provided sufficient water sources for all kinds of needs of Liukeng Village.The Dragon Lake in Liukeng held 83.0%of the precipitation,and the vegetation area accounted for 34.7%of the total area of Liukeng,which had high surface permeability and good middle drainage effects.Water detection showed that the Dragon Lake provided good water quality and purification.The purposes of this study are to fill the gap in previous non-quantitative research on water layout in traditional rural settlements,excavate the hidden information and value of settlements,and deepen our understanding of the ecological wisdom of the overall planning,layout and construction of water conservancy in traditional rural settlements.This knowledge can assist the win-win situation of water conservancy cultural heritage protection and modern utilization.It also provides useful inspiration and reference for properly dealing with the problems of rain and flooding,realizing the sustainability of water resources,and protecting the ecological environment in the process of the development and construction of village settlements in China.展开更多
基金Supported by the Items of Institution of Higher Education Scientific Research of Inner Mongolia under Grant No. NJ101116
文摘Based on the Huybrechts' linear-combination operator,effects of thermal lattice vibration on the effective potential of weak-coupling bipolaron in semiconductor quantum dots are studied by using the LLP variational method and quantum statistical theory.The results show that the absolute value of the induced potential of the bipolaron increases with increasing the electron-phonon coupling strength,but decreases with increasing the temperature and the distance of electrons,respectively;the absolute value of the effective potential increases with increasing the radius of the quantum dot,electron-phonon coupling strength and the distance of electrons,respectively,but decreases with increasing the temperature;the temperature and electron-phonon interaction have the important influence on the formation and state properties of the bipolaron:the bipolarons in the bound state are closer and more stable when the electron-phonon coupling strength is larger or the temperature is lower;the confinement potential and coulomb repulsive potential between electrons are unfavorable to the formation of bipolarons in the bound state.
基金The National Natural Science Foundation of China(51878439,51878437,51908179)The Project of Key Laboratory of Ministry of Cultureand Tourism(20180508)+1 种基金The Youth Foundation for Humanities and Social Sciences of the Ministry of Education(17YJCZH095)The SocialScience Foundation of Hebei Province(HB19YS036).
文摘During the long-term construction and development process of eliminating water disasters and promoting water conservancy in traditional settlements,a set of mature strategies that have simple ecological wisdom in water layout have been formed by adapting to the natural water environment and utilizing the regional water system.This study conducted a qualitative and quantitative analysis of the water layout strategies and their effects on Liukeng Village from three aspects:deciphering the water systematic pattern,calculating the spatial characteristics and quantifying the water environment,to explore the technical assistance and potential of water layout research in traditional rural settlements.The results indicated that Liukeng has an unambiguously systematic water layout pattern of source diversion,middle drainage and end purification of the water.Through 3D point cloud computing,it was shown that the site selection made accurate use of micro-topography and adopted the strategy of a multi-source water management.It formed an organic water system pattern,which provided sufficient water sources for all kinds of needs of Liukeng Village.The Dragon Lake in Liukeng held 83.0%of the precipitation,and the vegetation area accounted for 34.7%of the total area of Liukeng,which had high surface permeability and good middle drainage effects.Water detection showed that the Dragon Lake provided good water quality and purification.The purposes of this study are to fill the gap in previous non-quantitative research on water layout in traditional rural settlements,excavate the hidden information and value of settlements,and deepen our understanding of the ecological wisdom of the overall planning,layout and construction of water conservancy in traditional rural settlements.This knowledge can assist the win-win situation of water conservancy cultural heritage protection and modern utilization.It also provides useful inspiration and reference for properly dealing with the problems of rain and flooding,realizing the sustainability of water resources,and protecting the ecological environment in the process of the development and construction of village settlements in China.
