This paper introduces an approximate nuclear norm based matrix regression projection(ANMRP) model,an adaptive graph embedding method,for feature extraction of hyperspectral images.The ANMRP utilizes an approximate NMR...This paper introduces an approximate nuclear norm based matrix regression projection(ANMRP) model,an adaptive graph embedding method,for feature extraction of hyperspectral images.The ANMRP utilizes an approximate NMR model to construct an adaptive neighborhood map between samples.The globally optimal weight matrix is obtained by optimizing the approximate NMR model using fast alternating direction method of multipliers(ADMM).The optimal projection matrix is then determined by maximizing the ratio of the local scatter matrix to the total scatter matrix,allowing for the extraction of discriminative features.Experimental results demonstrate the effectiveness of ANMRP compared to related methods.展开更多
Metal foam material,which serves as an alternative replacement of the conventional flow distributor of proton exchange membrane(PEM)fuel cell,has been attracting much attention over last few decades.In this work,three...Metal foam material,which serves as an alternative replacement of the conventional flow distributor of proton exchange membrane(PEM)fuel cell,has been attracting much attention over last few decades.In this work,three-dimensional modeling work for PEM fuel cell containing metal foam as cathode flow distributor has been carried out.The fuel cell performance and operating characteristics of metal foam flow field and conventional parallel flow channel have been compared and discussed.The cell performance has been reasonably validated based on the corresponding experimental tests conducted in this study.The superior performance of PEM fuel cell with metal foam as cathode flow field benefits a lot from the uniform gas flow.The porous metal foam material provides more pathways for the water delivery at the interface of metal foam flow field and gas diffusion layer(GDL),accelerating water removal capability of cathode.Because of the significant oxygen transfer loss in diffusion limited parallel channel,the operation of PEM fuel cell with parallel channel is found to be more sensitive to cathode humidification and oxygen supply at inlet.Due to the more uniform and effective electron transport though the porous electrode,it is possible to use thinner GDL in metal foam PEM fuel cell.It is expected that this study could give a good baseline of operating behavior of PEM fuel cell with metal foam flow distributor.展开更多
基金supported by the National Natural Science Foundation of China (No.61906170)the Project of the Science and Technology Plan for Zhejiang Province (No.LGF21F020023)the Plan Project of Ningbo Municipal Science and Technology (Nos.2022Z233,2021Z050,2022S002 and 2023J403)。
文摘This paper introduces an approximate nuclear norm based matrix regression projection(ANMRP) model,an adaptive graph embedding method,for feature extraction of hyperspectral images.The ANMRP utilizes an approximate NMR model to construct an adaptive neighborhood map between samples.The globally optimal weight matrix is obtained by optimizing the approximate NMR model using fast alternating direction method of multipliers(ADMM).The optimal projection matrix is then determined by maximizing the ratio of the local scatter matrix to the total scatter matrix,allowing for the extraction of discriminative features.Experimental results demonstrate the effectiveness of ANMRP compared to related methods.
基金supported by the National Natural Science Foundation of China (Grant No.51921004)the Natural Science Foundation for Outstanding Young Scholars of Tianjin (Grant No.18JCJQJC46700)。
文摘Metal foam material,which serves as an alternative replacement of the conventional flow distributor of proton exchange membrane(PEM)fuel cell,has been attracting much attention over last few decades.In this work,three-dimensional modeling work for PEM fuel cell containing metal foam as cathode flow distributor has been carried out.The fuel cell performance and operating characteristics of metal foam flow field and conventional parallel flow channel have been compared and discussed.The cell performance has been reasonably validated based on the corresponding experimental tests conducted in this study.The superior performance of PEM fuel cell with metal foam as cathode flow field benefits a lot from the uniform gas flow.The porous metal foam material provides more pathways for the water delivery at the interface of metal foam flow field and gas diffusion layer(GDL),accelerating water removal capability of cathode.Because of the significant oxygen transfer loss in diffusion limited parallel channel,the operation of PEM fuel cell with parallel channel is found to be more sensitive to cathode humidification and oxygen supply at inlet.Due to the more uniform and effective electron transport though the porous electrode,it is possible to use thinner GDL in metal foam PEM fuel cell.It is expected that this study could give a good baseline of operating behavior of PEM fuel cell with metal foam flow distributor.
