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Si掺杂对Ga_(2)O_(3)/BP异质结光电性能调控的第一性原理研究

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原子与分子物理学报 2025年第4期42卷 131-137页

作者：李佳宏郝增瑞薛瑞鑫阚红梅关玉琴内蒙古工业大学理学院呼和浩特010010

近年来,氧化镓(Ga_(2)O_(3))是新一代超宽禁带(4.9 eV)半导体,基于优越的热稳定和化学稳定性、高击穿场强和可见光透过率等优点,在日盲紫外探测器和透明光电器件领域中引起了广泛的关注.但是,Ga_(2)O_(3)基光电器件存在迁移率较低而限... 详细信息

近年来,氧化镓(Ga_(2)O_(3))是新一代超宽禁带(4.9 eV)半导体,基于优越的热稳定和化学稳定性、高击穿场强和可见光透过率等优点,在日盲紫外探测器和透明光电器件领域中引起了广泛的关注.但是,Ga_(2)O_(3)基光电器件存在迁移率较低而限制其应用的现象,而构建合适的Ga_(2)O_(3)异质结是改善光电探测器的光电性能的有效手段之一.基于第一性原理构建β-Ga_(2)O_(3)/BP异质结模型,研究了氧空位(Vo)和Si掺杂对β-Ga_(2)O_(3)/BP异质结光电性质的调控以及相关机理.结果显示:β-Ga_(2)O_(3)/BP异质结结构有效降低β-Ga_(2)O_(3)功函数,提高灵敏度,Si掺杂降低结合能,增强稳定性;β-Ga_(2)O_(3)/BP异质结有效减小带隙,Si掺杂以及氧空位的存在,进一步减小带隙,增强光导电性,并且Si掺杂引起了光电导各向异性.此结果对改善Ga_(2)O_(3)基异质结光电性能提供理论参考.

关键词： β-Ga_(2)O_(3)/BP异质结缺陷光电性质第一性原理

Stretching correction for amplitude-preserving vector wavefield reverse-time migration

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China Geology 2019年第2期2卷 179-188页

作者： jia-jia Yang bing-shou He Hua-ning Xu Jun Pan Jun Liu hong Liu Qingdao Institute of Marine Geology China Geological SurveyMinistry of Natural ResourcesQingdao 266071China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of EducationOcean University of ChinaQingdao 266100China

The migration of multi-wave seismic data is aimed at obtaining the P- and S-wave imaging results of the amplitude preserving. But the P- and S-wave stretching effect produced by the reverse time migration of the elastic wave equation will not only reduce the vertical resolution of the migration results and the amplitude preserving of the large reflection angle. In this paper, the reverse time migration technique of amplitude preserving vector wave-field separating is used. Based on the analysis of the stretch mechanism and the influencing factors of stretch magnitude, the paper gave the stretch correcting factors. Then, realize the stretch correction method at the time that after the reverse extrapolation and before the imaging by solving the problem which is how to calculate the P-wave and Ps-wave propagation directions of imaging points at different times. The stretch correction method can improve the vertical resolution and amplitude fidelity of the imaging results and provide high fidelity input data for seismic data interpretation and inversion.

关键词： Reverse-time migration Multi-wave and multi-component Migration stretch correction Amplitude-preserving imaging Seismic migration imaging

Electro-oxidation process and mechanism of molybdenite decomposition under ultrasonic effect

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Rare Metals 2008年第6期27卷 566-570页

作者： jia Lijuan Zhong hong FU jiangang College of Chemistry and Chemical Engineering Central South University Changsha 410083 China

According to the characteristics and shortcomings of the traditional roasting process and the electro-oxidation process in the molybdenum metallurgical industry, the ultrasound electro-oxidation process was proposed to strengthen the oxidative decomposition or leaching of molybdenum. Laboratory work was carried out in an electrochemical cell with 15 mm electrode spacing at 25℃ under ultrasonic effect. The optimum conditions were found through experiments. The electro-oxidation mechanism of molybdenite decomposition under ultrasonic was investigated. A model of electro-oxidation mechanism of molybdenum under ultrasonic was given.

关键词： chemical metallurgy molybdenite leaching electron-oxidation ultrasonic

Broadband Acoustic Meta-structures Fabricated by Additive Manufacturing

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材料导报 2020年第11期34卷 11001-11002页

作者： jia Xiao hong Minghui YAN Ming Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3117583Singapore

Acoustic meta-structures,because of their flexible and unprecedented proprieties,such as negative dynamic density,negative bulk modulus and refractive index of negative,near-zero or extremely large value,enable new applications to manipulate sound waves propagation and control energy transfer[1].Over the past decades,the development of acoustic meta-structures has not only provided advanced functionalities but also tackled the problem of limited device ***,the meta-structures are explored based on two different kinds of unit cells:locally resonant and non-resonant *** acoustic components with the Helmholtz resonator[2],membrane structure[3]or other structured composites were investigated to realize local *** this circumstance,their resonant behaviors are sensitive to the frequency,where the desirable properties can be obtained in the vicinities of the resonant ***,they suffer from the inherent“narrow band”,resulting in large sound attenuation when the frequency is off *** the non-resonant meta-structures,the unit cell with convoluted waveguides such as space-coiling sound channels[4],labyrinthine[5]or tapered structures[6]were proposed to achieve unusual effective properties over a wider ***,the impedance mismatch between the meta-structure and the environmental fluid leads to a large energy reflection and sound attenuation inside the waveguides due to thermo-viscous loss in the narrow sound ***,it is still an open problem in both industry and academia to optimize the broadband performance of the meta-structure devices.

关键词： narrow sound sizes

Receptor-like Kinases in Root Development:Current Progress and Future Directions

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Molecular Plant 2021年第1期14卷 166-185页

作者： Yang Ou hong Kui jia Li Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations School of Life SciencesLanzhou UniversityLanzhou 730000China

Cell-to-cell and cell-to-environment communications are critical to the growth and development of *** surface-localized receptor-like kinases(RLKs)are mainly involved in sensing various extracellular signals to initiate their corresponding cellular *** important vegetative organs for higher plants to adapt to a terrestrial living situation,roots play a critical role for the survival of *** has been demonstrated that RLKs control many biological processes during root growth and *** this review,we summarize several key regulatory processes during Arabidopsis root developm ent in which RLKs play critical *** also put forward a number of relevant questions that are required to be explored in future studies.

关键词： receptor-like kinase root development Arabidopsis

A Physics-Informed Structure-Preserving Numerical Scheme for the Phase-Field Hydrodynamic Model of Ternary Fluid Flows

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Numerical Mathematics(Theory,Methods and Applications) 2023年第3期16卷 565-596页

作者： Qi hong Yuezheng Gong jia Zhao School of Mathematics Nanjing University of Aeronautics and Astronautics/Key Laboratory of Mathematical Modelling and High Performance Computing of Air Vehicles(NUAA)MIITNanjing 211106China Department of Mathematics and Statistics Utah State UniversityLoganUT84322USA

Phase-field models are widely used in studying multiphase flow *** the complexity and strong nonlinearity,designing accurate,efficient,and stable numerical algorithms to solve these models has been an active research field for *** paper proposes a novel numerical scheme to solve a highly cited and used phase field hydrodynamic model for simulating ternary phase fluid *** main novelty is the introduction of a supplementary variable to reformulate the original problem into a constrained optimization *** reformulation leads to several advantages for our proposed numerical algorithms compared with many existing numerical techniques for solving this ***,the developed schemes allow more straightforward calculations for the hydrodynamic phase-field models by solving a few decoupled Helmholtz or Poisson-type systems with a constant precomputable coefficient matrix,remarkably reducing the computational ***,the numerical schemes can maintain mass conservation and energy dissipation at the discrete ***,the developed scheme based on the secondorder backward difference formula respects the original energy dissipation law that differs from many existing schemes,such as the IEQ,SAV,and Lagrange multiplier approaches for which a modified energy dissipation law is ***,rigorous proof of energy stability and practical implementation strategies are *** conduct adequate 2D and 3D numerical tests to demonstrate the proposed schemes’accuracy and effectiveness.

关键词： Energy stable phase field Cahn-Hilliard-Navier-Stokes supplementary variable method

Cyclic oxidation behavior of electron beam physical vapor deposition NiAlHf and NiAlHfCrSi coatings at 1150℃

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Rare Metals 2023年第4期42卷 1408-1413页

作者： Si-jia Liang hong-Hai Song Lei Zheng hong-Bo Guo School of Materials Science and Engineering Beihang UniversityBeijing100191China Key Laboratory of Aerospace Materials and Performance(Ministry of Education) Beihang UniversityBeijing100191China

NiAlHf and NiAlHfCrSi coatings were deposited by electron beam physical vapor deposition(EBPVD).The grain size and orientation of NiAlHf and NiAlHfCrSi coatings were determined by electron backscatter diffraction(EBSD).The NiAlHf coating reveals a more uniform grain size compared to NiAlHfCrSi coating,while the NiAlHfCrSi coating shows apreferential orientation which is parallel to the normal direction of the surface of the *** cyclic oxidation behavior of NiAlHf and NiAlHfCrSi coatings at 1150℃was *** to NiAlHf coating,the NiAlHfCrSi coating shows improved resistance to cyclic oxidation and scale *** effect of grain size and orientation on the cyclic oxidation behavior of NiAlHf and NiAlHfCrSi coatings were investigated at 1150℃.

关键词： Rare earth elements Thermal cycling Coatings Grain size Orientation

A robust vector tracking loop structure based on potential bias analysis

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Chinese Journal of Aeronautics 2024年第4期37卷 405-420页

作者： Qiongqiong jia Yiran LUO bing XU Li-Ta HSU Renbiao WU Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of ChinaTianjin 300300China Interdisciplinary Division of Aeronautical and Aviation Engineering The Hong Kong Polytechnic University999077Hong KongChina Department of Geomatics Engineering University of CalgaryCalgary T2N1N4Canada

This paper proposes a robust vector tracking loop structure based on potential bias analysis. The influence of four kinds of biases on the existing two implementations of Vector Tracking Loops(VTLs) is illustrated by theoretical analysis and numerical simulations, and the following findings are obtained. Firstly, the initial user state bias leads to steady navigation solution bias in the relative VTL, while new measurements can eliminate it in the absolute VTL. Secondly, the initial code phase bias is transferred to the following navigation solutions in the relative VTL, while new measurements can eliminate it in the absolute VTL. Thirdly, the user state bias induced by erroneous navigation solution of VTLs can be eliminated by both of the two VTLs. Fourthly,the multipath/NLOS likely affects the two VTLs, and the induced tracking bias in the duration of the multipath/NLOS would decrease the performance of VTLs. Based on the above analysis,a robust VTL structure is proposed, where the absolute VTL is selected for its robustness to the two kinds of initialization biases;meanwhile, the instant bias detection and correction method is used to improve the performance of VTLs in the duration of the multipath/NLOS. Numerical simulations and experimental results verify the effectiveness of the proposed robust VTL structure.

关键词： Global Navigation Satellite System(GNSS) Vector Tracking Loop(VTL) Multipath Non-Line-of-Sight(NLOS) Tracking bias propagation Least Absolute Shrinkage and Selection Operator(LASSO)

Distributed analysis of forward stimulated Brillouin scattering for acoustic impedance sensing by extraction of a 2nd-order local spectrum

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Chinese Physics B 2021年第8期30卷 375-380页

作者： Yu-Lian Yang jia-bing Lin Li-Ming Liu Xin-hong jia Wen-Yan Liang Shi-Rong Xu Li jiang College of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610101China

Distributed fiber sensors based on forward stimulated Brillouin scattering(F-SBS)have attracted special attention because of their capability to detect the acoustic impedance of liquid material outside ***,the reported results were based on the extraction of a 1st-order local spectrum,causing the sensing distance to be restricted by pump ***,a novel post-processing technique was proposed for distributed acoustic impedance sensing by extracting the 2nd-order local spectrum,which is beneficial for improving the sensing signal-to-noise ratio(SNR)significantly,since its pulse energy penetrates into the fiber more *** a proof-of-concept,distributed acoustic impedance sensing along~1630 m fiber under moderate spatial resolution of~20 m was demonstrated.

关键词： distributed acoustic impedance sensing forward stimulated Brillouin scattering(F-SBS) 2nd-order local spectrum