Imaging is an important method for astronomy research.In practice,original images acquired by a telescope are often convolved and blurred by the point-spread function(PSF),which is a very unfavorable situation for man...Imaging is an important method for astronomy research.In practice,original images acquired by a telescope are often convolved and blurred by the point-spread function(PSF),which is a very unfavorable situation for many scientific studies including astronomy.This paper introduced a single equation iterative method for solving complex linear equations,and this method can deconvolute dirty images,eliminate the effects of the PSF well.With different PSFs,this algorithm shows very good results in deconvolution.Also,with a giant PSF of aperture synthesis imaging,this algorithm improves the peak signal-to-noise ratio and structural similarity of the dirty images by 41.0%and 33.9%on average.In addition,this paper proves that the algorithm can deconvolute the dirty image by making full use of the information of each pixel in the image,even if the dirty image has salt and pepper noise or even lost areas;by its excellent properties of flexible operation to a single pixel,all these bad situations can be dealt with and the image can be restored.展开更多
Nowadays,internal combustion engine vehicles are considered as one of the major contributors to air pollution.To make transportation more environmentally friendly,plug-in electric vehicles(PEVs)have been proposed.Howe...Nowadays,internal combustion engine vehicles are considered as one of the major contributors to air pollution.To make transportation more environmentally friendly,plug-in electric vehicles(PEVs)have been proposed.However,with an increase in the number of PEVs,the drawbacks associated with the cost and size,as well as charging cables of batteries have arisen.To address these challenges,a novel technology named wireless charging system has been recently recommended.This technology rapidly evolves and becomes very attractive for charging operations of electric vehicles.Currently,wireless charging systems offer highly efficient power transfer over the distances ranging from several millimeters to several hundred millimeters.This paper is focused on analyzing electromagnetically coupled resonant wireless technique used for the charging of EVs.The resonant wireless charging system for EVs is modeled,simulated,and then examined by changing different key parameters to evaluate how transfer distance,load,and coil’s geometry,precisely number of coil’s turns,coil’s shape,and inter-turn distance,influence the efficiency of the charging process.The simulation results are analyzed and critical dimensions are discussed.It is revealed that a proper choice of the dimensions,inter-turn distance,and transfer distance between the coils can result in a significant improvement in charging efficiency.Furthermore,the influence of the transfer distance,frequency,load,as well as the number of the turns of the coil on the performance of wireless charging system is the main focus of this paper.展开更多
基金supported by the National Key R&D Program of China(No.2022YFE0133700)the National Natural Science Foundation of China(NSFC,No.12273007)+4 种基金the Guizhou Provincial Excellent Young Science and Technology Talent Program(No.YQK[2023]006)the National SKA Program of China(No.2020SKA0110300)the NSFC(No.11963003)the Guizhou Provincial Basic Research Program(Natural Science)(No.ZK[2022]143)the Cultivation project of Guizhou University(No.[2020]76).
文摘Imaging is an important method for astronomy research.In practice,original images acquired by a telescope are often convolved and blurred by the point-spread function(PSF),which is a very unfavorable situation for many scientific studies including astronomy.This paper introduced a single equation iterative method for solving complex linear equations,and this method can deconvolute dirty images,eliminate the effects of the PSF well.With different PSFs,this algorithm shows very good results in deconvolution.Also,with a giant PSF of aperture synthesis imaging,this algorithm improves the peak signal-to-noise ratio and structural similarity of the dirty images by 41.0%and 33.9%on average.In addition,this paper proves that the algorithm can deconvolute the dirty image by making full use of the information of each pixel in the image,even if the dirty image has salt and pepper noise or even lost areas;by its excellent properties of flexible operation to a single pixel,all these bad situations can be dealt with and the image can be restored.
基金supported by the Program-Targeted Funding of the Ministry of Education and Science of the Republic of Kazakhstan through the Innovative Materials and Systems for Energy Conversion and Storage for 2018–2020(Grant No.BR05236524).
文摘Nowadays,internal combustion engine vehicles are considered as one of the major contributors to air pollution.To make transportation more environmentally friendly,plug-in electric vehicles(PEVs)have been proposed.However,with an increase in the number of PEVs,the drawbacks associated with the cost and size,as well as charging cables of batteries have arisen.To address these challenges,a novel technology named wireless charging system has been recently recommended.This technology rapidly evolves and becomes very attractive for charging operations of electric vehicles.Currently,wireless charging systems offer highly efficient power transfer over the distances ranging from several millimeters to several hundred millimeters.This paper is focused on analyzing electromagnetically coupled resonant wireless technique used for the charging of EVs.The resonant wireless charging system for EVs is modeled,simulated,and then examined by changing different key parameters to evaluate how transfer distance,load,and coil’s geometry,precisely number of coil’s turns,coil’s shape,and inter-turn distance,influence the efficiency of the charging process.The simulation results are analyzed and critical dimensions are discussed.It is revealed that a proper choice of the dimensions,inter-turn distance,and transfer distance between the coils can result in a significant improvement in charging efficiency.Furthermore,the influence of the transfer distance,frequency,load,as well as the number of the turns of the coil on the performance of wireless charging system is the main focus of this paper.
