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Tunable dual-band terahertz graphene absorber with guided mode resonances

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Chinese Physics B 2021年第1期30卷 234-238页

作者： Jun Wu Xia-Yin Liu zhe huang Department of Physics Zhejiang University of Science and TechnologyHangzhou 310023China College of Electrical Engineering Anhui Polytechnic UniversityWuhu 241000China

A tunable dual-band terahertz absorber is designed and investigated. The unit cell of the proposed absorber consists of a graphene monolayer on a guided-mode resonant filter. The graphene absorber presents > 40% absorption at two resonance frequencies, which is attributed to the guided mode resonances with different mode numbers. The electric field intensity distribution is analyzed to disclose the physical mechanism of such a dual-band absorption effect. Furthermore,the influence of optical properties of graphene, including Fermi level and relaxation time, on the absorption spectra are investigated. Finally, the influence of geometric parameters on the absorption spectrum is studied, which will provide useful guidance for the fabrication of this absorber. We believe that the results may be useful for developing the next-generation graphene-based optoelectronic devices.

关键词： dual-band graphene guided mode resonance spectrum selective absorption

Coastline changes and tidal current responses due to the large-scale reclamations in the Bohai Bay

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Journal of Oceanology and Limnology 2023年第6期41卷 2045-2059页

作者： zhe huang Haijue XU Yuchuan BAI Fengshuo SHI Zhichao WEN State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300350China Institute for Sedimentation on River and Coastal Engineering Tianjin UniversityTianjin 300350China

China’s Bohai Bay has experienced large-scale land reclamation since *** reclamation projects create a nearshore ecological imbalance and shift sediment transport by changing the tidal ***,these tidal current changes are not comprehensively *** this paper,the coastline changes in Bohai Bay due to reclamation are investigated and the responses of the tidal current are calculated through numerical *** results show that the coastline length of the bay increases by more than 500 km from 2000 to 2015 with the largest reclamation rate of 150.9 km^(2)/***,the current velocity changes with an uneven distribution near the reclamation due to construction masking and dike *** tidal symmetry also changes in most nearshore areas,with opposite variations in the current velocity at peak flood and ebb *** addition,the tide direction deflects to bypass the reclamation and is usually consistent with the *** analysis of the dominant M2 tidal constituent shows that the range of the reciprocating current is widely *** total influence of the reclamation can reach the-8-m isobaths in Bohai *** in the tidal current are the main causes of water environment ***,the arrangement and structural optimization of reclamation projects should be considered in the future.

关键词： Bohai Bay reclamation coastline tidal current

Energy dissipation caused by boundary resistance in a typical reach of the lower Yellow River and the implications for riverbed stability

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Journal of Geographical Sciences 2022年第11期32卷 2311-2327页

作者： XU Haijue LI Yan huang zhe BAI Yuchuan ZHANG Jinliang State Key Lab.of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China Institute for Sediment River and Coast EngineeringTianjin UniversityTianjin 300072China Yellow River Engineering Consulting Co. Ltd.Zhengzhou 450003China

The energy dissipation of boundary resistance is presented in this paper based on the flow ***,the river morphology responses to the resistance energy dissipation are explored using the Gaocun-Taochengpu reach in the lower Yellow River as a *** analysis,measured data analysis and a one-dimensional hydrodynamic model are synthetically used to calculate the energy dissipation rate and riverbed morphological *** results show that the energy dissipation rate along the channel will increase in both the mean value and the fluctuation intensity with increasing ***,the energy dissipation rate will first decrease and then increase as the flow section or width-depth ratio *** addition,the energy dissipation rate has a significant positive correlation with the riverbed stability *** results imply that the water and sediment transport efficiency of the river channel can be improved by optimizing the cross-sectional configuration to fulfil the minimum energy dissipation rate of the boundary resistance under stable riverbed conditions.

关键词： energy dissipation rate boundary resistance riverbed stability numerical simulation lower Yellow River

Porous nanofibrous dressing enables mesenchymal stem cell spheroid formation and delivery to promote diabetic wound healing

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Chinese Journal of Chemical Engineering 2024年第4期68卷 156-164页

作者： Kexin Zhang Wenmin Zhang Heng An zhe huang Yanzhen Wen Xiangyu Jiao Yongqiang Wen College of Chemical Engineering and Technology Taiyuan University of Science and TechnologyTaiyuan 030024China Beijing Key Laboratory for Bioengineering and Sensing Technology Daxing Research InstituteSchool of Chemistry&Biological EngineeringUniversity of Science&Technology BeijingBeijing 100083China

Delayed and nonhealing of diabetic wounds imposes substantial economic burdens and physical pain on *** stem cells(MSCs)promote diabetic wound *** when MSCs aggregate into multicellular spheroids,their therapeutic effect is ***,traditional culture platforms are inadequate for the efficient preparation and delivery of MSC spheroids,resulting in inefficiencies and inconveniences in MSC spheroid *** this study,a three-dimensional porous nanofibrous dressing(NFD)is prepared using a combination of electrospinning and homogeneous *** thermal crosslinking,the NFD not only achieves satisfactory elasticity but also maintains notable *** the design of its structure and chemical composition,the NFD allows MSCs to spontaneously form MSC spheroids with controllable sizes,serving as MSC spheroid delivery systems for diabetic wound *** importantly,MSC spheroids cultured on the NFD exhibit improved secretion of vascular endothelial growth factor,basic fibroblast growth factor,and hepatocyte growth factor,thereby accelerating diabetic wound *** NFD provides a competitive strategy for MSC spheroid formation and delivery to promote diabetic wound healing.

关键词： Electrospinning Homogenization Biomedical engineering Nanomaterials Stem cell spheroids Diabetic wound healing

Phosphafluorenyl lithiums:direct synthesis from white phosphorus,structure and diversified synthons

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Science China Chemistry 2022年第2期65卷 322-327页

作者： Jingyuan Hu zhengqi Chai Wei Liu zhe huang Junnian Wei Wen-Xiong Zhang Beijing National Laboratory for Molecular Sciences(BNLMS) State Key Laboratory of Rare Earth Materials Chemistry and Applications&Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of EducationCollege of ChemistryPeking UniversityBeijing 100871China

While rich chemistry of phospholyl anions is discovered,phosphafluorenyl anions are only proposed as the critical intermediates for the synthesis of *** this article,we reported the direct synthesis of phosphafluorenyl lithiums from white phosphorus(P_(4))through direct P-C bond *** reaction between P4 and biphenyl dilithio reagents efficiently afforded phosphafluorenyl lithiums,which were further used to synthesize different kinds of organophosphorus *** aggregation states of phosphafluorenyl lithiums were investigated for the first *** studies by DFT calculations revealed a cooperative nucleophilic attack of two C−Li bonds on P_(4)molecule.

关键词： white phosphorus organophosphorus compounds P–C bond formation P_(4)functionalization phosphafluorenyl lithium

Fully Coupled Simulation of Interactions Among Waves, Permeable Breakwaters and Seabeds Based on N−S Equations

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China Ocean Engineering 2021年第1期35卷 26-35页

作者： LI Yan-ting WANG Deng-ting SUN Tian-ting huang zhe LIU Qing-jun School of Civil Engineering Tianjin UniversityTianjin 300350China Nanjing Hydraulic Research Institute Nanjing 210029China

Interstitial flows in breakwater cores and seabeds are a key consideration in coastal and marine engineering designs and have a direct impact on their structural *** this paper,a unified fully coupled model for wave−permeable breakwater−porous seabed interactions is built based on an improved N−S equation.A numerical wave flume is constructed,and numerical studies are carried out by applying the finite difference *** combination with a physical model test,the accuracy of the numerical simulation results is verified by comparing the calculated and measured values of wave height at measurement points and the seepage pressure within the breakwater and *** this basis,the characteristics of the surrounding wave field and the internal flow field of the pore structure,as well as the evolution process of the fluctuating pore water pressure inside the breakwater and seabed,are further *** spatial distribution of the maximum fluctuating pore water pressure in the breakwater is compared between two cases by considering whether the seabed is permeable,and then the effect of seabed permeability on the dynamic pore water pressure in the breakwater is *** study attempts to provide a reference for breakwater design and the protection of nearby seabeds.

关键词： wave−breakwater−seabed interaction permeable breakwater porous seabed pore water pressure finite difference method

Nucleation of Y-Si-O Nano-clusters in Multi-microalloyed Nano-structured Ferritic Alloys:a First-principles Study

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Acta Metallurgica Sinica(English Letters) 2021年第7期34卷 955-962页

作者： Shiyu He Qi Qian zhe huang Yuxiang Gong Jiajing Chen Yiren Wang Yong Jiang School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory for Powder Metallurgy Central South UniversityChangsha 410083China

First-principles energetics analyses were performed to investigate the nucleation of(Y-Si-O)nano-clusters(NCs)in nanostructured ferritic alloys(NFAs).It was predicted that the nucleation of(Y-Si-O)NCs follows the same general pathway as previously found for(Y-Ti/Al/Zr-O)NCs in NFAs:they all tend to begin with the(O-O)pairs and grow to(O-Y)-cores and further to larger NCs by attracting Y and other solute elements *** of a hexa-atomic-[2Y-Si-3O]-cluster can reduce the total energy by 4.71 *** various microalloying-induced NCs,the nucleation preference ordering was predicted as(Y-Zr-O)>(Y-Ti-O)>(Y-Al-O)>(Y-Si-O).The number densities and chemical compositions of NCs in multi-microalloyed NFAs would largely depend on the number availability of(O,Y)-cores,as well as the relative abundance and atomic diffusivities of microalloying solute elements nearby.

关键词： Nano-structured ferritic alloy Y-Si-O Nano-cluster First-principles

Weather Information Acquisition and Health Significance during Extreme Cold Weather in a Subtropical City:A Crosssectional Survey in Hong Kong

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International Journal of Disaster Risk Science 2017年第2期8卷 134-144页

作者： Emily Ying Yang Chan zhe huang Carman Ka Man Mark Chunlan Guo Collaborating Centre for Oxford University and CUHK for Disaster and Medical Humanitarian Response (CCOUC) The Jockey Club School of Public Health and Primary CareThe Chinese University of Hong Kong Nuffield Department of Medicine University of Oxford Franois-Xavier Bagnoud Center for Health and Human Rights Harvard University

Health and disaster risk reduction are important and necessary components in building a smart city,especially when climate change may increase the frequency of extreme temperatures and the health risks of urban ***,limited knowledge is available about the best way to disseminate weather warnings and health protection *** study explores the weather information acquisition patterns of the Hong Kong public and examines the sociodemographic predictors of these patterns to establish the potential public health implications of smart city development.A population-based,stratified crosssectional,random digit dialing telephone survey was conducted among the Cantonese-speaking population aged over 15 years in Hong Kong in early *** were conducted based on 1017 valid samples,with a response rate of 63.6%.Cold Weather Warnings were well disseminated in Hong Kong,with 95.7% of the respondents reporting awareness of the public *** and smartphone apps were the two most important channels for weather information *** and education level are the main social-demographic variables associated with the current utilization and future preference of smartphone *** those who were not using a preferredchannel to acquire weather information,61.3% considered switching to a smartphone ***,the patterns of individual health protection measures and self-reported health impacts were significantly different between smartphone app users and *** information dissemination should be tailored to the sociodemographic characteristics of the users.

关键词： Cold weather warnings Public health emergencies Smart cities Subtropical city Weather information dissemination systems

Genetic variability and evolution of rice stripe virus

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Journal of zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第10期14卷 875-885页

作者： Ling-zhe huang Li-xia RAO Xue-ping ZHOU Jian-xiang WU State Key Laboratory of Rice Biology Institute of Biotechnology Zhejiang University

Rice stripe virus(RSV) is the type member of the genus *** is known to have four segmented,single-stranded RNA molecules and causes rice stripe disease in the rice fields of China,Japan,and *** on the complete genomic sequences of the determined 6 RSV isolates(from Yunnan,Jiangsu,zhejiang,and Liaoning Provinces,China) and 27 other RSV isolates(from Yunnan,Jiangsu,Anhui,Henan,and Shandong Provinces of China,also Japan and Korea) downloaded from GenBank,we provided a genotyping profile of RSV field isolates and described the population structure of *** RSV isolates,except isolate CX,could be divided into two subtypes,one including 6 isolates from Yunnan Province,and the other including 26 isolates from different parts of China,Japan,and Korea,which were referred to as subtype II and subtype I,*** amino acid distances between subtypes range from 0.053 to *** isolates in Yunnan Province were genetically differentiated from other parts of China,Japan,and Korea and showed infrequent gene *** RSV populations collected from other parts of China,Japan,and Korea were only composed of subtype I and showed very low genetic *** speculated that isolate CX may be the result of recombination of isolates from two *** potential recombination events were detected in RNA4 of isolate CX.

关键词： Rice stripe virus Genetic variability Genetic evolution