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The electromagnetic response of composition-regulated honeycomb structural materials used for broadband microwave absorption

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Journal of Materials Science & Technology 2021年第29期88卷 203-214页

作者： Huifang Pang Yuping Duan Xuhao Dai Lingxi Huang Xuan Yang Tuo Zhang Xiaoji Liu Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116085China

The undesirable absorption bandwidth is the main limitation for the application of microwave absorbing *** that the design of structure and composition of absorbing coating allows it to obtain a satisfying absorption bandwidth and to avoid weight increasing,honeycomb and its sandwich structures coated by various absorbant have been developed and measured using an arch measurement system over2-18 *** further understand the absorption mechanisms of honeycomb structural materials,simulation based on finite element method and transmission line theory is performed to analyze the different responses to the applied microwave between honeycomb structural materials and uniform-medium slab *** proper composition design allows control over the microwave loss mechanisms,which optimize the coating to possess both of the dielectric and magnetic *** the honeycomb structural materials,the magnetic resonation is found for the first time,which is resulting from the periodic honeycomb walls on both sides of the dielectric cavity(consisting of the aramid paper interlayer and vacuum hexagonal prisms).In addition,the conversion of structure from solid to honeycomb brings about changes in impedance,propagating path,effective wavelength,effective attenuation area,microwave phases,and inductive coupling effect,etc.,which result in a better microwave absorbing *** honeycomb sandwich structure coated by CIP/CB/EP with the weight ratio of 4:0.03:1 shows the absorption bandwidth of~9.8 GHz for reflection loss(RL)lower than-10 dB which covers part of the S and C bands and almost the whole X and Ku bands.

关键词： Microwave absorption Structural materials Honeycomb electromagnetic response

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Crystal structure and electromagnetic responses of tetragonal GdAlGe

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Chinese Physics B 2020年第12期29卷 469-474页

作者： Cong Wang Yong-Quan Guo Tai Wang Shuo-Wang Yang School of Energy Power and Mechanical Engineering North China Electric Power UniversityBeijing 102206China

The ternary rare-earth aluminum germanide GdAlGe with tetragonal structure is systematically studied by x-ray diffraction,magnetic and electric *** magnetic and electric properties of GdAlGe are strongly related to its special magnetic structure formed by magnetic Gd3 isosceles triangles△*** GdAlGe orders ferromagnetically at 21 K due to the exchanging interaction of Gd3△↑-△↑*** mechanism of magnetic transport originates from the slip scattering induced by Stoner spin fluctuation in the magnetic ordering region and the spin wave scattering induced by the thermal photon excitation and phonon scattering in the paramagnetic *** positive magnetoresistance is observed in GdAlGe,which might be due to the disordered magnetic scatter induced by magnetic anisotropy in GdAlGe.

关键词： GdAlGe Weyl semimetal magnetic isosceles triangle electromagnetic response

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Morphology-controlled CoNi/C hybrids with bifunctions of efficient anti-corrosion and microwave absorption

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Journal of Materials Science & Technology 2022年第7期102卷 24-35页

作者： Jianwen Ge Yu Cui Jiaxin Qian Li Liu Fandi Meng Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Till now,fewer literatures have investigated the corrosion resistance of microwave absorbers,especially mental@C/carbon matrix derived from MOF composites,although it is known that carbon shells possess a protective ***,three kinds of morphology-controlled CoNi/C-N doped architectures were suc-cessfully fabricated via a sequence of processing,namely coprecipitation for ZIF-67,subsequent Ni^(2+) ex-change and ultimate *** from composition characterization,the effects of microstructure tailoring and temperature controlling on electromagnetic response as well as attenuation performance were revealed,where dodecahedron-shaped composites possessed the highest *** contrast,rod-shaped composites(CoNi/C-r-550 and CoNi/C-r-700)were endowed with superior comprehensive ab-sorption properties,e.g.,RL_(min):-49.8 dB and-64.0 dB;EAB:5.7 GHz and 4.8 GHz,***,samples CoNi/C-d-700 and CoNi/C-r-700 present higher corrosion potential(E_(corr))and lower corrosion current(I corr).Hence,these corrosion-resistant microwave absorbers with outstanding absorption stabil-ity,wetting effect as well as environmental adaptability,can be used as a candidate/raw material for intelligent devices.

关键词： electromagnetic response Morphological-anisotropic Anticorrosive ZIF-67

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Carrier Density and Plasma Frequency of Alummum Nanofilms

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Journal of Materials Science & Technology 2003年第4期19卷 365-367页

作者： HaoDU JunGONG ChaoSUN RongfangHUANG lISHIWEN W.Y.Cheung S.P.Wong InstituteofMetalResearch ChineseAcademyofSciencesShenyang110016China TheChinsesUniversityofHongKong HongKongChina

In this work, the prerequisite and mode of electromagnetic response of Al nanof ilms to electromagnetic wave field was suggested. Reflectance, transmittance in infrared region and carrier density of the films was measured. With the carrier density of the films, the dependence of their plasma frequencies on the film thickness was obtained. On the other hand, the dependence of absorptance on the frequency of electromagnetic wave field was set up by using the measured reflectance and transmittance, which provided plasma frequency-film thickness relation as well. Similarity of both plasma frequency-film thickness relations proved plasma resonance as a mode of electromagnetic response in Al nanofilms.

关键词： Aluminum nanofilm electromagnetic response Size effect

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Comparison of the time-domain electromagnetic field from an infinitesimal point charge and dipole source

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Applied Geophysics 2013年第3期10卷 349-356,359页

作者：周楠楠薛国强王贺元中国科学院矿产资源研究重点实验室中国科学院地质与地球物理研究所北京100029 辽宁工业大学理学院锦州121001

An electromagnetic field is generated through the accelerating movement of two equal but opposite charges of a single dipole. An electromagnetic field can also be generated by a time-varying infinitesimal point charge. In this study, a comparison between the electromagnetic fields of an infinitesimal point charge and a dipole has been presented. First, the time-domain potential function of a point source in a 3D conductive medium is derived. Then the electric and magnetic fields in a 3D homogeneous lossless space are derived via the relation between the potential and field. The field differences between the infinitesimal point charge and the dipole in the step-off time, far-source, and near-source zones are analyzed, and the accuracy of the solutions from these sources is investigated. It is also shown that the field of the infinitesimal point charge in the near-source zone is different from that of the dipole, whereas the far-source zone fields of these two sources are identical. The comparison of real and simulated data shows that the infinitesimal point charge represents the real source better than the divole source.

关键词： Infinitesimal point charge dipole source time-domain electromagnetic response near-source zone.

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