本文主要介绍FREQUENTIS VCS3020X Vel 7.0内话系统,在投入空中交通管制过程中,为满足管制员在不同时期的不同需求,通过修改TMCS的相应配置,包括配置不同电话类型,修改内话席位图布局等日常维护,以达到管制员要求。由于FREQUENTIS内话...本文主要介绍FREQUENTIS VCS3020X Vel 7.0内话系统,在投入空中交通管制过程中,为满足管制员在不同时期的不同需求,通过修改TMCS的相应配置,包括配置不同电话类型,修改内话席位图布局等日常维护,以达到管制员要求。由于FREQUENTIS内话系统具有较高的可靠性和较强的实用性,正越来越多地被广泛使用于空中交通管制用途。展开更多
Electronic devices pervade everyday life,which has triggered severe electromagnetic(EM)wave pollution.To face this challenge,developing EM wave absorbers with ultra-broadband absorption capacity is critically required...Electronic devices pervade everyday life,which has triggered severe electromagnetic(EM)wave pollution.To face this challenge,developing EM wave absorbers with ultra-broadband absorption capacity is critically required.Currently,nano-composite construction has been widely utilized to realize impedance match and broadband absorption.However,complex experimental procedures,limited thermal stability,and interior oxidation resistance are still unneglectable issues.Therefore,it is appealing to realize ultra-broadband EM wave absorption in single-phase materials with good stability.Aiming at this target,two high-entropy transition metal carbides(HE TMCs)including(Zr,Hf,Nb,Ta)C(HE TMC-2)and(Cr,Zr,Hf,Nb,Ta)C(HE TMC-3)are designed and synthesized,of which the microwave absorption performance is investigated in comparison with previously reported(Ti,Zr,Hf,Nb,Ta)C(HE TMC-1).Due to the synergistic effects of dielectric and magnetic losses,HE TMC-2 and HE TMC-3 exhibit better impedance match and wider effective absorption bandwidth(EAB).In specific,the exclusion of Ti element in HE TMC-2 endows it optimal minimum reflection loss(RL_(min))and EAB of−41.7 dB(2.11 mm,10.52 GHz)and 3.5 GHz(at 3.0 mm),respectively.Remarkably,the incorporation of Cr element in HE TMC-3 significantly improves the impedance match,thus realizing EAB of 10.5,9.2,and 13.9 GHz at 2,3,and 4 mm,respectively.The significance of this study lays on realizing ultra-broadband capacity in HE TMC-3(Cr,Zr,Hf,Nb,Ta),demonstrating the effectiveness of high-entropy component design in tailoring the impedance match.展开更多
文摘本文主要介绍FREQUENTIS VCS3020X Vel 7.0内话系统,在投入空中交通管制过程中,为满足管制员在不同时期的不同需求,通过修改TMCS的相应配置,包括配置不同电话类型,修改内话席位图布局等日常维护,以达到管制员要求。由于FREQUENTIS内话系统具有较高的可靠性和较强的实用性,正越来越多地被广泛使用于空中交通管制用途。
基金We gratefully acknowledge the financial support from the National Natural Science Foundation of China(Nos.51972089,51672064,and U1435206).
文摘Electronic devices pervade everyday life,which has triggered severe electromagnetic(EM)wave pollution.To face this challenge,developing EM wave absorbers with ultra-broadband absorption capacity is critically required.Currently,nano-composite construction has been widely utilized to realize impedance match and broadband absorption.However,complex experimental procedures,limited thermal stability,and interior oxidation resistance are still unneglectable issues.Therefore,it is appealing to realize ultra-broadband EM wave absorption in single-phase materials with good stability.Aiming at this target,two high-entropy transition metal carbides(HE TMCs)including(Zr,Hf,Nb,Ta)C(HE TMC-2)and(Cr,Zr,Hf,Nb,Ta)C(HE TMC-3)are designed and synthesized,of which the microwave absorption performance is investigated in comparison with previously reported(Ti,Zr,Hf,Nb,Ta)C(HE TMC-1).Due to the synergistic effects of dielectric and magnetic losses,HE TMC-2 and HE TMC-3 exhibit better impedance match and wider effective absorption bandwidth(EAB).In specific,the exclusion of Ti element in HE TMC-2 endows it optimal minimum reflection loss(RL_(min))and EAB of−41.7 dB(2.11 mm,10.52 GHz)and 3.5 GHz(at 3.0 mm),respectively.Remarkably,the incorporation of Cr element in HE TMC-3 significantly improves the impedance match,thus realizing EAB of 10.5,9.2,and 13.9 GHz at 2,3,and 4 mm,respectively.The significance of this study lays on realizing ultra-broadband capacity in HE TMC-3(Cr,Zr,Hf,Nb,Ta),demonstrating the effectiveness of high-entropy component design in tailoring the impedance match.
基金Projects (51101042, 51271064) supported by the National Natural Science Foundation of ChinaProject (HIT. NSRIF. 201131) supported by the Fundamental Research Funds for the Central Universities+1 种基金Projects (2012T50327, 2011M500653) supported by the 5th-class Special Financial Grant and the 50th-class General Financial Grant from the China Postdoctoral Science FoundationProject supported by the Provincial Heilongjiang Postdoctoral Science Foundation, China
