The application and development of a wide-area measurement system(WAMS)has enabled many applications and led to several requirements based on dynamic measurement data.Such data are transmitted as big data information ...The application and development of a wide-area measurement system(WAMS)has enabled many applications and led to several requirements based on dynamic measurement data.Such data are transmitted as big data information flow.To ensure effective transmission of wide-frequency electrical information by the communication protocol of a WAMS,this study performs real-time traffic monitoring and analysis of the data network of a power information system,and establishes corresponding network optimization strategies to solve existing transmission problems.This study utilizes the traffic analysis results obtained using the current real-time dynamic monitoring system to design an optimization strategy,covering the optimization in three progressive levels:the underlying communication protocol,source data,and transmission process.Optimization of the system structure and scheduling optimization of data information are validated to be feasible and practical via tests.展开更多
Magnetic‒carbon composites,as functional materials,present significant challenges in understanding the mechanism by which magnetic particle distribution influences their electromagnetic(EM)properties.This study innova...Magnetic‒carbon composites,as functional materials,present significant challenges in understanding the mechanism by which magnetic particle distribution influences their electromagnetic(EM)properties.This study innovatively proposes a melamine-induced surface magnetic regulation strategy,successfully constructing a composite microsphere system with tunable microwave absorption(MA)performance.By precisely controlling the amount of melamine added,the distribution of magnetic nanoparticles(NPs)on the carbon microspheres was accurately regulated,thereby achieving customized space distribution and optimizing the impedance EM properties.The reduced magnetic Co NPs further catalyzed the formation of a graphitized carbon layer from polyvinylpyrrolidone.Moreover,the introduction of melamine further modulated Co NP growth,resulting in their spatial distribution along the interiors,surface,and exterior of the microspheres.Finally,Co@C-CNT-2 composites with optimized magnetic particle distributions exhibited excellent MA performance,achieving a minimum reflection loss value(RLmin)of-32.48 dB and excellent effective absorption bandwidth(EAB)of~5.2 GHz at a thickness of 1.8 mm.The synergistic effect of dielectric and magnetic loss is realized through the surface magnetization strategy,which provides a new strategy for the design of high-performance EM wave absorption materials.展开更多
文摘The application and development of a wide-area measurement system(WAMS)has enabled many applications and led to several requirements based on dynamic measurement data.Such data are transmitted as big data information flow.To ensure effective transmission of wide-frequency electrical information by the communication protocol of a WAMS,this study performs real-time traffic monitoring and analysis of the data network of a power information system,and establishes corresponding network optimization strategies to solve existing transmission problems.This study utilizes the traffic analysis results obtained using the current real-time dynamic monitoring system to design an optimization strategy,covering the optimization in three progressive levels:the underlying communication protocol,source data,and transmission process.Optimization of the system structure and scheduling optimization of data information are validated to be feasible and practical via tests.
基金supported by the National Natural Science Foundation of China(Nos.52231007,12327804,T2321003,22088101,and 22405050)the National Key Program of China(Nos.2024YFA1208902,2024YFA1408000,and 2021YFA1200600)+4 种基金the Science and Technology Commission of Shanghai Municipality(No.24ZR1406400)the Aeronautical Science Foundation of China(Nos.202400180P9001 and 2024M0730P9001)the Key Laboratory of High-Temperature Electromagnetic Materials and Structure of MOE(No.KB202401)the Fund of Science and Technology on Surface Physics and Chemistry Laboratory(No.JCKYS2023120201)the Shanghai Municipal Education Commission(No.24KXZNA06).
文摘Magnetic‒carbon composites,as functional materials,present significant challenges in understanding the mechanism by which magnetic particle distribution influences their electromagnetic(EM)properties.This study innovatively proposes a melamine-induced surface magnetic regulation strategy,successfully constructing a composite microsphere system with tunable microwave absorption(MA)performance.By precisely controlling the amount of melamine added,the distribution of magnetic nanoparticles(NPs)on the carbon microspheres was accurately regulated,thereby achieving customized space distribution and optimizing the impedance EM properties.The reduced magnetic Co NPs further catalyzed the formation of a graphitized carbon layer from polyvinylpyrrolidone.Moreover,the introduction of melamine further modulated Co NP growth,resulting in their spatial distribution along the interiors,surface,and exterior of the microspheres.Finally,Co@C-CNT-2 composites with optimized magnetic particle distributions exhibited excellent MA performance,achieving a minimum reflection loss value(RLmin)of-32.48 dB and excellent effective absorption bandwidth(EAB)of~5.2 GHz at a thickness of 1.8 mm.The synergistic effect of dielectric and magnetic loss is realized through the surface magnetization strategy,which provides a new strategy for the design of high-performance EM wave absorption materials.
