Combining suitable microstructure and dielectric-magnetic synergy effect is conducive to achieve lightweight,broadband,and high-efficiency microwave absorbing materials within low filler loading.Herein,porous carbon p...Combining suitable microstructure and dielectric-magnetic synergy effect is conducive to achieve lightweight,broadband,and high-efficiency microwave absorbing materials within low filler loading.Herein,porous carbon polyhedrons coupled with bimetallic CoNi alloys were synthesized by using metalorganic frameworks(MOFs)as a template and subsequent pyrolysis treatment.Electromagnetic analysis indicated that the existence of metal Ni element could influence the wave attenuation capacity effectively,resulting in frequency selective wave absorption performance.Additionally,the pyrolysis temperature was also closely related to wave absorption intensity.The Co_(2)Ni_(1)/C/PVDF composites calcined at 800℃ possessed outstanding wave absorption performance at an ultra-low filler loading of 5 wt%.The minimum reflection loss value achieved-52 dB(10.8 GHz)under the matched thickness of 3 mm.Moreover,the broadest effective absorption bandwidth(RL<-10 dB)reached 6.2 dB(11.8-18 GHz)for Co/C-800/PVDF composites when the thickness turned into 2 mm.The remarkable wave attenuation ability was mainly ascribed to magnetic and dielectric loss,impedance matching as well as porous structure effect.展开更多
The significant wave height prediction holds critical value for marine energy development,coastal infrastructure planning,and ensuring safety in maritime operations.The precision of such predictions carries substantia...The significant wave height prediction holds critical value for marine energy development,coastal infrastructure planning,and ensuring safety in maritime operations.The precision of such predictions carries substantial the oretical and practical weight.This survey delivers an exhaustive evaluation and integration of the latest studies and advances in the domain of significant wave height prediction,serving as a methodical guidepost for academicians.The study introduces an all-encompassing predictive framework for significan wave height,which not only integrates diverse established forecasting techniques but also paves the way for novel research trajectories and creative breakthroughs.The framework is structured into four principal layers i...feature selection,basic prediction,data decomposition,and parameter optimization.The ensuing sections meticulously dissect the methodologies within these strata,elucidating their core concepts,distinctive features merits,and constraints,and their applicability to significant wave height prediction.To wrap up,the study delves into fresh research inguiries and avenues pertinent to the discipline,thereby broadening the comprehension of significant wave height prediction.In essence,this scholarly article imparts critical knowledge beneficial to the realm of marine technology.展开更多
基金supported by the National Natural Science Foundation of China(No.52073010)Beijing Natural Science Foundation(2214069)。
文摘Combining suitable microstructure and dielectric-magnetic synergy effect is conducive to achieve lightweight,broadband,and high-efficiency microwave absorbing materials within low filler loading.Herein,porous carbon polyhedrons coupled with bimetallic CoNi alloys were synthesized by using metalorganic frameworks(MOFs)as a template and subsequent pyrolysis treatment.Electromagnetic analysis indicated that the existence of metal Ni element could influence the wave attenuation capacity effectively,resulting in frequency selective wave absorption performance.Additionally,the pyrolysis temperature was also closely related to wave absorption intensity.The Co_(2)Ni_(1)/C/PVDF composites calcined at 800℃ possessed outstanding wave absorption performance at an ultra-low filler loading of 5 wt%.The minimum reflection loss value achieved-52 dB(10.8 GHz)under the matched thickness of 3 mm.Moreover,the broadest effective absorption bandwidth(RL<-10 dB)reached 6.2 dB(11.8-18 GHz)for Co/C-800/PVDF composites when the thickness turned into 2 mm.The remarkable wave attenuation ability was mainly ascribed to magnetic and dielectric loss,impedance matching as well as porous structure effect.
基金supported by the Open Project of Xiangjiang Laboratory(No.22XJ02003)National Science Fund for Outstanding Young Scholars(No.62122093)+1 种基金Science&Technology Project for Young and Middle-aged Talents of Hunan(No.2023TJ-Z03)University Fundamental Research Fund(Nos.23-ZZCX-JDZ-28 and ZK21-07).
文摘The significant wave height prediction holds critical value for marine energy development,coastal infrastructure planning,and ensuring safety in maritime operations.The precision of such predictions carries substantial the oretical and practical weight.This survey delivers an exhaustive evaluation and integration of the latest studies and advances in the domain of significant wave height prediction,serving as a methodical guidepost for academicians.The study introduces an all-encompassing predictive framework for significan wave height,which not only integrates diverse established forecasting techniques but also paves the way for novel research trajectories and creative breakthroughs.The framework is structured into four principal layers i...feature selection,basic prediction,data decomposition,and parameter optimization.The ensuing sections meticulously dissect the methodologies within these strata,elucidating their core concepts,distinctive features merits,and constraints,and their applicability to significant wave height prediction.To wrap up,the study delves into fresh research inguiries and avenues pertinent to the discipline,thereby broadening the comprehension of significant wave height prediction.In essence,this scholarly article imparts critical knowledge beneficial to the realm of marine technology.
