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Enhanced spectral splitting in a novel solar spectrum optical splitter based on one dimensional photonic crystal heterostructure

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Journal of Materiomics 2021年第3期7卷 648-655页

作者： Dong Wei Feng Cao Zuoxu Wu Yijie Liu Jian Wang Qingmei Wang Xingjun Liu Qian Zhang School of Science and Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information SystemHarbin Institute of TechnologyShenzhenGuangdong518055China Department of Materials Science and Engineering Harbin Institute of TechnologyShenzhenGuangdong518055China

Controlling the distribution of solar spectrum in different bands would boost the energy harvesting efficiency and optimize the energy dispatchability.1D photonic crystal with intrinsic optical band gap can be used to split the solar spectrum for hybrid photovoltaic/thermal solar ***,we designed an efficient solar spectrum optical filter based on a cermet layer,Si/SiO_(2)1D photonic crystal,and top heterostructure *** with 1D photonic crystal structure,the 1D photonic crystal heterostructure with top YSZ layer can realize the reflectance of greater than 92%in PV band and the low average reflectance in two thermal bands by tuning the effective impedance of multilayer *** enhanced reflectance in PV band results from the huge mismatching of impedance between free space and the heterostructure *** top dielectric layer can also be extended to other oxides.

关键词： Solar spectral splitting 1D photonic crystal heterostructure Solar absorptance effective impedance

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Effect of the Real Irregular Terrain on the Lightning-radiated Electromagnetic Field Propagation

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Meteorological and Environmental Research 2021年第3期12卷 55-61页

作者： Fangrong ZHOU Yi MA Hao PAN Bin ZOU Jing YANG Electric Power Research Institute Yunnan Power Grid Company Ltd.Kunming 650217China Key Laboratory of Meteorological Disaster Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster(CICFEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological AdministrationNanjing University of Information Science and TechnologyNanjing 210044China

The propagation of the lightning-radiated electromagnetic field along the real irregular terrain around Yangzhou Direction Finder(DF)site(119°42′E,32°39′N)and Nanjing DF site(118°46′E,32°03′N)of Jiangsu Province in China is *** results show that the rough irregular terrain results in the rapid magnitude attenuation and the increase of the rise-time of the field *** example,for the Yangzhou DF site as the circumference of a radius of 45 km,the root-mean-squared height(RMSH)of the real irregular terrain varies from 7 to 33 m;the extra field attenuation relative to the ideal ground surface ranges from 1%to 11%,and the extra rise-time increment varies from 0.1 to 0.6μ***,the extracted current peak of lightning return stroke may be underestimated from the remotely measured electromagnetic field,and the error varies along with different azimuths.

关键词： Global Digital Elevation Model(GDEM) Irregular terrain Lightning electromagnetic fields effective impedance Attenuation function

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