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Characterization of ultraviolet communication in a mixed aerosol environment

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Optoelectronics Letters 2025年第2期 77-84页

作者： ZHAO Taifei SUN Yuxin wang wuxin ZHANG haijun PAN Feixiang wu Hao Artificial Intelligence Key Laboratory of Sichuan Province Sichuan University of Science & Engineering Faculty of Automation and Information Engineering Xi'an University of Technology

Wireless ultraviolet (UV) has strong scattering characteristics and can communicate through non-direct *** UV signals are transmitted in the atmosphere,they are affected by the absorption and scattering effects of atmospheric particles and atmospheric turbulence,resulting in attenuation of UV signal energy and reduced reliability of the communication *** paper focuses on the channel model of UV non-direct-view single scattering communication,and simulates and analyzes the communication characteristics of UV light in atmospheric turbulence and mixed aerosol environment under horizontal,vertical and oblique range communication *** results show that at equal relative humidity,the wireless UV non-directive scattering communication performance for vertical communication scenarios is more affected by the mixed aerosol environment and the communication performance is worse.

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An Adaptive Finite Element Method with a Modified Perfectly Matched Layer Formulation for Diffraction Gratings

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Communications in Computational Physics 2009年第7期6卷 290-318页

作者： Jie chen Desheng wang haijun wu Division of Mathematical Sciences School of Physical and Mathematical SciencesNanyang Technological University21 Nanyang LinkSingapore 637371 Department of Mathematics Nanjing UniversityJiangsu 210093China

For numerical simulation of one-dimensional diffraction gratings both in TE and TM polarization,an enhanced adaptive finite element method is proposed in this paper.A modified perfectly matched layer(PML)formulation is proposed for the truncation of the unbounded domain,which results in a homogeneous Dirichlet boundary condition and the corresponding error estimate is greatly *** a posteriori error estimates for the adaptive finite element method are ***,a lower bound is obtained to demonstrate that the error estimates obtained are sharp.

关键词： Diffraction grating adaptive finite element method PML a posteriori error estimates

Uniform convergence of multigrid V-cycle on adaptively refined finite element meshes for second order elliptic problems

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Science China Mathematics 2006年第10期49卷 1405-1429页

作者： wu haijun chen Zhiming Department of Mathematics Nanjing University Nanjing 210093 China Institute of Computational Mathematics Chinese Academy of Sciences Beijing 100080 China.

In this paper we prove the uniform convergence of the standard multigrid V-cycle algorithm with the Gauss-Seidel relaxation performed only on the new nodes and their "immediate" neighbors for discrete elliptic problems on the adaptively refined finite element meshes using the newest vertex bisection algorithm. The proof depends on sharp estimates on the relationship of local mesh sizes and a new stability estimate for the space decomposition based on the Scott-Zhang interpolation operator. Extensive numerical results are reported, which confirm the theoretical analysis.

关键词： Multigrid V-cycle algorithm, adaptive finite element meshes, local relaxation, Scott-Zhang interpolation.

Effect of MgCl_(2) on electrophoretic deposition of TbF_(3) powders on Nd-Fe-B sintered magnet

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Journal of Rare Earths 2023年第5期41卷 721-727,I0004页

作者： chen wang Yang luo Zilong wang Wenlong Yan Yanyan Zhao Ningtao Quan haijun Peng Kaiwen wu Yuehua Ma Chunlei Zhao Dunbo Yu National Engineering Research Center for Rare Earth GRINM Group Co.Ltd.Beijing 100088China GRIREM Advanced Materials Co. Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China

Using electrophoretic deposition(EPD)method,the TbF_(3)powders were deposited on the surface of sintered Nd-Fe-B magnets,and the effects of MgCl_(2)on electrophoretic deposition and grain boundary diffusion were *** results show that addition of 5 wt%MgCl_(2)can significantly improve the EPD efficiency and improve the adhesion of the coating by releasing local stress through the formation of special gully *** with Biesheuvel equation,the effects of suspension concentration,voltage and time on EPD amount were *** Biesheuvel equation can be simplified asγ=AUSct/L,and A(=0.0141-0.0144)in this experiment was calculated to achieve the quantitative calculation of EPD *** heat treatment of 875℃×10 h+500℃×1 h,the coercivity of 48H(7 mm)sintered magnet with 0.3 wt%TbF_(3)increases from 18.5 to 22.4 kOe,with an increase of 21.1%.The core-shell structure was observed by a back-scattered scanning electron microscope(BSE-SEM),which proves that the addition of MgCl_(2)has no adverse effect on the grain boundary diffusion of Nd-Fe-B sintered magnets.

关键词： Electrophoretic deposition Nd-Fe-B TbF_(3) Coating adhesion Grain boundary diffusion Rare earths

An Agent-Based Approach for Time-Series Momentum and Reversal

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Journal of Systems Science & Complexity 2020年第2期33卷 461-474页

作者： wang Zhaoyuan LIU Shancun YANG haijun wu Harris School of Economics and Management Beihang UniversityBeijing 100191China Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang UniversityBeijing 100191China College of Business and Public Administration Old Dominion UniversityNorfolkVirginiaUSA

This paper proposes a novel agent-based model combining private information diffusion to explain time-series momentum and *** information transmission allows heterogeneous trading strategies coexist in the artificial *** experiments reproduce momentum in short horizon and reversal in long horizon in the artificial financial ***,the authors also analyze how the private information contagion affects the ***,the authors find the significant price trend and excess volatility of volume when private information diffuses gradually.

关键词： Agent-based model excess volatility of volume price trend private information contagion time-series momentum

Blood circulation activating effect of Sanqi(Radix Notoginseng) on venous thromboembolism rats

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Journal of Traditional Chinese Medicine 2021年第5期41卷 753-761页

作者： ZHU chen JIANG Huifang ZHOU Xiaqing ZHANG Zhirong wu Yu FANG haijun wang Lingcong Department ICU of the First Affiliated Hospital of Zhejiang Chinese Medical University Hangzhou 310006China Department of Hematology Tongde Hospital of Zhejiang ProvinceHangzhou 310012China Department Orthopaedics of the First Affiliated Hospital of Zhejiang Chinese Medical University Hangzhou 310006China Department Dental of the First Affiliated Hospital of Zhejiang Chinese Medical University Hangzhou 310006China

OBJECTIVE:To explore the blood circulation activating effect and mechanism of Sanqi(Radix Notoginseng)in vivo,using a venous thromboembolism(VTE)rat ***:We established the VTE rat model,and then intervened with low molecular weight hepa-rin(LMWH),as well as low,medium and high doses of Sanqi(Radix Notoginseng),to observe the blood circulation activating effect of Sanqi(Radix Notoginseng)on VTE ***:After the treatment with high concentrations of Sanqi(Radix Notoginseng),the pulmonary thromboembolism was alleviated,and the lower limb thrombosis was markedly ***,the expression quantities of plasma activated partial thromboplastin time,prothrombin time and D-dimer,as well as endothelin,von Willebrand factor,and plasminogen activator inhibitor-1 in thrombosis segment tissues were markedly down-regulated;while those of nitric oxide and tissue-type plasminogen activator were *** low and medium concentration Sanqi(Radix Notoginseng)treatment,no obvious improvement was observed in each ***,the high concentration Sanqi(Radix Notoginseng)showed comparable efficacy to the positive drug ***:This data suggests that high concentration of Sanqi(Radix Notoginseng)is effective in preventing and treating VTE.

关键词： venous thromboembolism blood circulation heparin,low-molecular-weight Sanqi(Radix Notoginseng)

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Molecular Framework for Auxin-Controlled Hlomeostasis-of Shoot Stem Cells in Arabidopsis

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Molecular Plant 2018年第7期11卷 899-913页

作者： Linjie luo Jian Zengg haijun wu Zhaoxia Tian Zhong Zhao CAS Center for Excellence in Molecular Plant Sciences School of Life Sciences University of Science and Technology of China Huangshan Road 443Hefei 230027 China

The classic phytohormone auxin plays an essential role in priming meristematic cell differentiation in the shoot apical meristem to promote lateral organ initiation. Recently, several lines of evidence have suggested that auxin is not only transported to new primordia but also descends to the stem cells in the central zone. However, the function of auxin in stem cell regulation has remained elusive. Here, we show that auxin signaling in stem cells is mediated, at least in part, byAUXIN RESPONSE FACTOR 5/MONOPTEROS （ARF5/MP）, which directly represses the transcription of DORNROSchen /ENHANCER OF SHO0 T REGENERA TION 1 （DRN/ESR 1）. DRN expressed in stem cells positively regulates CLAVATA3 （CLV3） expression and has important meristematic functions. Our results provide a mechanistic framework for auxin control of shoot stem cell homeostasis and demonstrate how auxin differentially controls plant stem cell maintenance and differentiation.

关键词： stem cell homeostasis auxin MONOPTEROS DORNROSchen

A POSTERIORI ERROR ESTIMATES FOR FINITE ELEMENT APPROXIMATIONS OF THE CAHN-HILLIARD EQUATION AND THE HELE-SHAW FLOW

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Journal of Computational Mathematics 2008年第6期26卷 767-796页

作者： Xiaobing Feng haijun wu Department of Mathematics The University of Tennessee Knoxville TN 37996 USA Department of Mathematics Nanjing University Nanjing 210093 China

This paper develops a posteriori error estimates of residual type for conforming and mixed finite element approximations of the fourth order Cahn-Hilliard equation ut ＋ △（ε△Au-ε^-1f（u）） = 0. It is shown that the a posteriori error bounds depends on ε^-1 only in some low polynomial order, instead of exponential order. Using these a posteriori error estimates, we construct at2 adaptive algorithm for computing the solution of the Cahn- Hilliard equation and its sharp interface limit, the Hele-Shaw flow. Numerical experiments are presented to show the robustness and effectiveness of the new error estimators and the proposed adaptive algorithm.

关键词： Cahn-Hilliard equation Hele-Shaw flow Phase transition Conforming elements Mixed finite element methods A posteriori error estimates Adaptivity.

Theoretical and experimental design of Pt-Co（OH）2 electrocatalyst for efficient HER performance in alkaline solution

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Progress in Natural Science:Materials International 2019年第3期29卷 356-361页

作者： haijun wu Xiaoqing Zuo Shanpeng wang Jun-Wen Yin Yan-Ning Zhang Jialin chen School of Materials Science and Engineering Kunming University of Science and Technology State Key Laboratory of New Technologies for Comprehensive Utilization of Rare and Precious Metals Beijing Computational Science Research Center Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China

Design efficient electrocatalysts become significant for the hydrogen evolution reaction （HER） in alkaline ***,the HER performance on Pt-Co（OH）2 has been investigated by using DFT *** with pure Pt,the Pt-Co（OH）2 shows excellent hydrogen binding energy （-0.29 eV） and hydrogen adsorption free energy （0.02 eV）.More strikingly,the water dissociation process on Pt-Co（OH）2 is an exothermic reaction while that of Pt is an endothermic reaction,demonstrating that the Pt-Co（OH）2is an excellent catalyst for HER in alkaline *** the two-step electrodepositions was used to fabricate Pt-Co（OH）2 on the carbon paper （CP）.The Pt-Co（OH）2/CP shows the lowest overpotential of only 37.6 mV at a current density of 10 mA cm-2in 0.1M KOH,the smallest Tafel slope of58 mV dec-1and the good stability for 20000s without obvious degradation.

关键词： OH Theoretical and experimental design of Pt-Co HER electrocatalyst for efficient HER performance in alkaline solution