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Modulation of the cutoff wavelength in the spectra for solar selective absorbing coating based on high-entropy films

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International Journal of Minerals,Metallurgy and Materials 2020年第10期27卷 1371-1378页

作者： Ping Song Cong Wang Jie Ren Ying Sun Yong Zhang Angélique Bousquet Thierry Sauvage Eric Tomasella Center for Condensed Matter and Material Physics Beihang UniversityBeijing 100083China Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China Beijing Advanced Innovation Center of Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China UniversitéClermont Auvergne Centre national de la recherche scientifique(CNRS)SIGMA ClermontInstitut de Chimie de Clermont-Ferrand(ICCF)Clermont-Ferrand F-63000France Extreme Conditions and Materials:High Temperature and Irradiation(CEMHTI-UPR 3079 CNRS Orléans F-45100France

This paper demonstrates an intrinsic modulation of the cutoff wavelength in the spectra for solar selective absorbing coating based on high-entropy ***(NiCuCrFeSi)N((NCCFS)N)films were deposited by a magnetron sputtering *** backscattering spectroscopy analysis confirms the uniform composition and good homogeneity of these high-entropy *** real and imaginary parts of the permittivity for the(NCCFS)N material are calculated on the basis of the reflectance spectral fitting results.A redshift cutoff wavelength of the reflectance spectrum with increasing nitrogen gas flow rate exists because of the different levels of dispersion when changing nitrogen *** realize significant solar absorption,the film surface was reconstituted to match its impedance with air by designing a pyramid nanostructure *** with the absorptance of the as-deposited films,the designed metasurface obtains a significant improvement in solar absorption with the absorptance increasing from 0.74 to *** metasurfaces also show low mid-infrared emissions with thermal emittance that can be as low as *** results demonstrate a new idea in the design of solar selective absorbing surface with controllable absorptance and low infrared emission for high-efficiency photo-thermal conversion.

关键词： cutoff wavelength solar selective absorption infrared emission nanostructure high-entropy film

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Growth and characteristics of InAsSb epilayers with a cutoff wavelength of 4.8 μm prepared by one-step liquid phase epitaxy

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Rare Metals 2009年第4期28卷 313-316页

作者： GAO Yuzhu GONG Xiuying FANG Weizheng Akihiro Ishida College of Electronics and Information Engineering Tongji University Shanghai 201804 China Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China Shizuoka University 3-5-1 Johoku Hamamatsu 432-8011 Japan

InAsSb epilayers with a cutoff wavelength of 4.8 μm have been successfully grown on InAs substrates by one-step liquid phase epitaxy （LPE） technology. The epilayers were characterized by X-ray diffraction （XRD）, Fourier transform infrared （PTIR） transmittance measurements and scanning electron microscopy （SEM）. The influence of different growth conditions on the optical and structural properties of the materials was studied. The results revealed that the good crystalline quality, mirror smooth surface and flat interface of InAsSb epilayers were achieved. They benefited from optimized growth conditions, i.e., sufficient homogeneity of the growth melt and a very slow cooling rate.

关键词： InAsSb liquid phase epitaxy crystalline quality cutoff wavelength scanning electron microscopy

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cutoff wavelength Measurement for Single Mode Optical Fibers with Computer-generated Matched Filter

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Chinese Journal of Lasers 1998年第5期 40-46页

作者： CHEN Heming (Basic Course Department, Nanjing University of Posts and Telecommunications, Nanjing 210003, China) Received Oct. 29, 1997 Revised manuscript received March. 30, 1998

１ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｃｕｔｏｆｗａｖｅｌｅｎｇｔｈ，ａｔｗｈｉｃｈｔｈｅｆｉｒｓｔｈｉｇｈｅｒｏｒｄｅｒｍｏｄｅｄｉｓａｐｐｅａｒｓ，ｉｓｏｎｅｏｆｔｈｅｍｏｓｔｉｍｐｏｒｔａｎｔｐａｒａｍｅｔｅｒｓｆ... 详细信息

１ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｃｕｔｏｆｗａｖｅｌｅｎｇｔｈ，ａｔｗｈｉｃｈｔｈｅｆｉｒｓｔｈｉｇｈｅｒｏｒｄｅｒｍｏｄｅｄｉｓａｐｐｅａｒｓ，ｉｓｏｎｅｏｆｔｈｅｍｏｓｔｉｍｐｏｒｔａｎｔｐａｒａｍｅｔｅｒｓｆｏｒａｓｉｎｇｌｅｍｏｄｅｏｐｔｉ...

关键词： cutoff wavelength computer generated holograms matched spatial filtering

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Propagation of Electromagnetic Wave in Coaxial Conical Transverse Electromagnetic Wave Cell

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Chinese Journal of Mechanical Engineering 2015年第6期28卷 1222-1228页

作者： LIU Xingxun ZHANG Tao QI Wangquan School of Electrical Engineering and Automation Tianjin University Beijing Institute of Radio Metrology and Measurement

In order to solve the problem of broadband field probes calibration with only selected discrete frequencies above 1 GHz, a sweep-frequency calibration technology based on a coaxial conical（co-conical） cell is researched. Existing research is only qualitative because of the complexity of theoretical calculations. For designing a high performance cell, a mathematic model of high-order modes transmission is built according to the geometrical construction of co-conical. The associated Legendre control functions of high-order modes are calculated by using recursion methodology and the numerical calculation roots are presented with different half angles of inner and outer conductor. Relationship between roots and high-order modes transmission is analyzed, when the half angles of inner conductor and outer conductor are θ1=1.5136° and θ2=8° respectively, the co-conical cell has better performance for fewer transmitting high-order modes. The propagation process of the first three transmitting modes wave is simulated in CST-MWS software from the same structured co-conical. The simulation plots show that transmission of high-order modes appears with electromagnetic wave reflection, then different high-order mode transmission has different cut-off region and each cut-off region is determined by its cut-off wavelength. This paper presents numerical calculation data and theoretical analysis to design key structural parameters for the co-conical transverse electromagnetic wave cell（co-conical TEM cell）.

关键词： coaxial conical TEM cell high-order mode cutoff wavelength

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Wave Azimuth cutoff Compensation Method and the Multisatellite Networking Mode of SAR

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Journal of Ocean University of China 2023年第3期22卷 683-696页

作者： WAN Yong CUI Kun QU Ruozhao DAI Yongshou LI Ligang QU Xiaojun ZHANG Xiaoyu College of Oceanography and Space Informatics China University of PetroleumQingdao 266580China China College of Control Science and Engineering China University of PetroleumQingdao 266580China

Synthetic aperture radars(SARs)encounter the azimuth cutoff problem when observing sea ***,SARs can only capture the waves with wavelengths larger than the cutoff wavelength and lose the information of waves with smaller *** increase the accuracy of SAR wave observations,this paper investigates an azimuth cutoff compensation method based on the simulated multiview SAR wave synchronization data obtained by the collaborative observation via networked *** on the simulated data and the equivalent multiview measured data from Sentinel-1 virtual networking,the method is verified and the cutoff wavelengths decrease by 16.40%and 14.00%.The biases of the inversion significant wave height with true values decrease by 0.04 m and 0.14 m,and the biases of the mean wave period decrease by 0.17 s and 0.22 s,*** results demonstrate the effectiveness of the azimuth cutoff compensation *** on the azimuth cutoff compensation method,the multisatellite SAR networking mode for wave observations are *** highest compensation effect is obtained when the combination of azimuth angle is(95°,115°,135°),the orbital intersection angle is(50°,50°),and three or four satellites are *** study of the multisatellite networking mode in this paper can provide valuable references for the compensation of azimuth cutoff and the observation of waves by a multisatellite network.

关键词： synthetic aperture radar(SAR) compensation effect cutoff wavelength multisatellite networking mode

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Study on the Transmission of Multi-Ridge Waveguides based on Finite Element Method

Study on the Transmission of Multi-Ridge Waveguides based on...

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2007 4th International Symposium on Electromagnetic Compatibility(EMC’2007)

Finite element method is introduced to analyze the transmission of multi-ridge waveguide,solves the cutoff wavelength of the dominant mode and field pattern of the typical model size in double ridge waveguides,triple ridge waveguides and quintupling ridge waveguides,analyzes the changes of the transmission by changed the multiple of ridges,the ridge width,the ridge height and the distance between *** computational data and figures are presented.

关键词： Finite element method Multi-ridge waveguides cutoff wavelength Field pattern

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