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In_(2)O_(3-)x(OH)y/Bi_(2)MoO_(6) S-scheme heterojunction for enhanced photocatalytic performance

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Journal of Materials Science & Technology 2020年第21期56卷 151-161页

作者： Zhongfu Li zhaohui wu Rongan He Long Wan Shiying Zhang College of Materials Science and Engineering Hunan UniversityChangsha410082China Hunan Key Laboratory of Applied Environmental Photocatalysis Changsha UniversityChangsha410005China

Surface heterojunction engineering has been extensively studied to promote efficient charge separation in semiconductor *** an effective heterojunction system to optimize the separation and transport of photo-induced charges is an appealing strategy to enhance the photocatalytic *** this work,In_(2)O_(3)-x(OH)y in situ decorated Bi_(2)MoO_(6) two-dimensional step-scheme heterojunctions were synthesized through a controlled dehydroxylation process of indium-based *** charge transfer mechanism of this step-scheme heterojunctions was confirmed by the characterization of electron structures,reactive species,photoelectric properties and DFT theoretical *** band bending and the internal electric field caused by the charge transfer upon hybridization can effectively promote the separation of charges and present the optimal redox *** addition,surface residual hydroxyl groups can regulate the surface energy state and optimize the interfacial charge transfer kinetics of the prepared step-scheme ***,the step-scheme heterojunction exhibits superior performance in photocatalytic reduction of hexavalent chromium and degradation of organic pollutants under visible light *** work provides an innovative perspective to construct photocatalyst with superior activity.

关键词： Step-scheme Heterojunction Bi_(2)MoO_(6) Photocatalyst

Regulating the crystal phase of bismuth-based semiconductors for promoted photocatalytic performance

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Science China Chemistry 2024年第6期67卷 1839-1864页

作者： zhaohui wu Mei-Chi Chong Shiying Zhang Junshan Li Yongfa Zhu Hunan Key Laboratory of Applied Environmental Photocatalysis Changsha UniversityChangsha410022China Department of Chemistry Tsinghua UniversityBeijing100084China Institute for Advanced Study Chengdu UniversityChengdu610106China

Numerous bismuth-based semiconductors(BBSs)with sophisticated and desirable structures used as photocatalysts for efficient photocatalytic degradation of water organic contaminants have attracted considerable ***,regulating the crystal phases and phase transition of BBSs for promoted photocatalytic performance is ***,the unique crystal structure and band structure features of each typical BBSs,and the vital roles on phase controlling of each phase were systematically presented based on the classification of ***,the critical factors for the phase transition of BBSs and intrinsic driving forces endowed by phases of BBSs for enhanced photocatalytic performance of organic contaminants removal were also *** review will provide systematical guidelines and horizons for regulating the crystal phase and phase transition of BBSs,promoting photocatalytic degradation and mineralization of organic contaminants.

关键词： bismuth-based semiconductors phase regulation photocatalytic performances organic contaminants

Synthesizing and editing dynamic flames with color temperature

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Chinese Science Bulletin 2014年第36期59卷 5379-5392页

作者： zhaohui wu Zhong Zhou Fei Dou Ye Duan Wei wu State Key Laboratory of Virtual Reality Technology and Systems Beihang University Computer Graphics and Image Understanding Laboratory University of Missouri Columbia MO 65211 USA

Generating computer animated flames is a difficult and computationally expensive problem. Dynamic textures provide an effective means for extrapolating and synthesizing dynamic flames, but aggravates color distortion due to the high correlation of RGB components. A novel method for dynamic flame texture synthesis using color temperature is proposed in this paper. Firstly, the colortemperature mapping is calculated by using the Planck's law and two-color pyrometric technique to avoid color distortion. Secondly, a novel dynamic texture model is presented to transform the RGB space into temperature space. Finally,the dynamic flames editing is presented to support physical temperature adjustment. Experimental results illustrate that our approach is effective to synthesize visually plausible dynamic flames without color distortions and to edit dynamic flames with intuitive physical interpretation.

关键词：纹理合成火焰色温编辑 RGB空间计算问题彩色失真温度调节

Laplacian-based 3D mesh simplification with feature preservation

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International Journal of Modeling, Simulation, and Scientific Computing 2019年第2期10卷 64-82页

作者： Wei Lyu Wei wu Lin Zhang zhaohui wu Zhong Zhou State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing 100191 P.R.China Generic Technology Center Systems Engineering Research Institute Beijing 100036 P.R.China Transportation Basic Research and Applied Innovation Center China Academy of Transportation Sciences Beijing 100029 P.R.China

We propose a novel Laplacian-based algorithm that simplifies triangle surface meshes and can provide different preservation ratios of geometric *** efficient and fast algorithm uses a 3D mesh model as input and initially detects geometric features by using a Laplacian-based shape descriptor(L-descriptor).The algorithm further performs an optimized clustering approach that combines a Laplacian operator with K-means clustering algorithm to perform vertex ***,we introduce a Laplacian weighted cost function based on L-descriptor to perform feature weighting and error statistics comparison,which are further used to change the deletion order of the model elements and preserve the saliency *** algorithm can provide different preservation ratios of geometric features and may be extended to handle arbitrary mesh *** experiments on a variety of 3D surface meshes demonstrate the advantages of our algorithm in terms of improving accuracy and applicability,and preserving saliency geometric features.

关键词： Mesh simplification L-descriptor feature weighting feature metric feature preservation

Longitudinal control for person-following robots

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Journal of Intelligent and Connected Vehicles 2022年第2期5卷 88-98页

作者： Liang Wang Jiaming wu Xiaopeng Li zhaohui wu Lin Zhu China Academy of Transportation Sciences BeijingChina Department of Architecture and Civil Engineering Chalmers University of TechnologyGothenburgSweden University of South Florida TampaFloridaUSA

Purpose–This paper aims to address the longitudinal control problem for person-following robots(PFRs)for the implementation of this ***/methodology/approach–Nine representative car-following models are analyzed from PFRs application and the linear model and optimal velocity model/full velocity difference model are qualified and selected in the PFR ***–A lab PFR with the bar-laser-perception device is developed and tested in the field,and the results indicate that the proposed models perform well in normal person-following ***/value–This study fills a gap in the research on PRFs longitudinal control and provides a useful and practical reference on PFRs longitudinal control for the related research.

关键词： Person following robot Longitudinal control model Parameter optimization

Preparation of high-purity straight silicon nanowires by molten salt electrolysis

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Journal of Energy Chemistry 2020年第1期29卷 171-179,I0006页

作者： Jie Zhang Sheng Fang Xiaopeng Qi Zhanglong Yu zhaohui wu Juanyu Yang Shigang Lu General Research Institute for Nonferrous Metals Beijing 100088China China Automotive Battery Research Institute Co. LtdBeijing 100088China

Silicon nanowires of high purity and regular morphology are of prime importance to ensure high specific capacities of lithium-ion batteries and reproducible electrode assembly *** nickel formate as a metal catalyst precursor,straight silicon nanowires(65–150 nm in diameter)were directly prepared by electrolysis from the Ni/SiO2 porous pellets with 0.8 wt%nickel content in molten CaCl2 at 900℃.Benefiting from their straight appearance and high purity,the silicon nanowires therefore offered an initial coulombic efficiency of 90.53% and specific capacity of 3377 m Ah/*** addition,the silicon nanowire/carbon composite exhibited excellent cycle performance,retaining 90.38%of the initial capacity after 100 *** further study on the charge storage performance is still ongoing,these preliminary results demonstrate that nickel formate is an efficient and effective metal catalyst precursor for catalytic preparation of high purity straight silicon nanowires via the molten salt electrolysis,which is suitable for large-scale production.

关键词： Silicon nanowires Electrochemical reduction Silicon dioxide Nickel formate

Speech interaction with a rat

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Chinese Science Bulletin 2014年第28期59卷 3579-3584页

作者： zhaohui wu Yingchun Yang Bingchao Xia Zhenchuan Zhang Gang Pan College of Computer Science and Technology Zhejiang University

This paper presents the first report of a system of human's speech interaction with rats via integration of brain–machine interfaces and automatic speech recognition technologies. We propose a novel human–rat speech interaction paradigm by incorporating speech translator module, which translates human's speech commands into suitable electrical brain stimulation to steer the rat to induce expected locomotor behaviors. The preliminary results show that we can guide a rat's movement by speech commands. We further look into the future application scenarios together with forthcoming challenges facing this newly evolved cyborg intelligent system. This work will pave the way for natural interaction with animal robots.

关键词：语音交互老鼠语音识别技术语音命令智能系统动物机器人脑机接口交互模式

Laboratory investigation into the oil diffusion from submarine pipeline under water flow

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Acta Oceanologica Sinica 2018年第11期37卷 96-103页

作者： JIANG Meirong YU Jianxing LI Zhigang ZHONG Wenjun wu zhaohui YU Yang State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University CNOOC Research Institute Co. Ltd. China National Offshore Oil Corporation (CNOOC) Offshore Oil Engineering Co. Ltd. China National Offshore Oil Corporation (CNOOC) State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology

A physical model test has been conducted to study the oil diffusion from the submarine pipeline under water *** crude oil in the flume is spilled from a leakage point of the pipeline and diffused from the seabed to the surface. By the non-contact optical measuring technology, an image acquisition and data analysis system is designed to explore the spilled mechanism and characteristic. The oil trajectory, velocity and the rising time to the surface are obtained through this system. The influence of the water flow and the spilled discharge on the behavior of the spilled oil are analyzed from both qualitative and quantitative perspectives. The sensitivity study of the characteristic physical quantities to various factors are presented afterward. The spilled oil under water is mainly distributed in the form of the scattered particles with different sizes. The rising process of the oil can be divided into three stages: full, dispersion and aggregation period. The spilled discharge is the primary factor affecting the rising time of the oil particles. In the rising process of the oil particles, the vertical velocity of the oil is mainly affected by the spilled discharge, and the transverse velocity is more dependent on the water velocity. The deviation of the transverse oil velocity is much larger than that of the rising time and the vertical oil velocity. The study can provide a theoretical reference for the prediction system of oil spill emergency.

关键词： oil diffusion submarine pipeline model test water flow spilled discharge

V_(2)O_(3)/VO_(2)@S/N-C nanofibers with excellent cycling stability and superior rate capability in aqueous zinc ion batteries

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Journal of Energy Chemistry 2024年第12期99卷 83-91页

作者： Li Chen Zhi Chen zhaohui wu Haijun Zeng Yabing Chen Huiyong Yang Wentao Qian Juntong Huang School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063JiangxiChina

The development of aqueous zinc-ion batteries (AZIBs) marks a significant advancement in the field of sustainable and environmentally friendly energy *** address the challenges faced by singlephase vanadium-based oxides,such as poor conductivity and dissolution in electrolytes,this study introduces vacuum S/N doping to fabricate V_(2)O_(3)/VO_(2)@S/N-C nanofibers,improving the cycling stability and enhancing the *** V_(2)O_(3)/VO_(2)@S/N-C electrode exhibits exceptional cyclic stability,retaining a capacity of 133.3 m A h g^(-1)after 30,000 cycles at a high current density of 100 A g^(-1)and a capacity retention of 81.8%after 150,000 cycles at 200 A g^(-1).Characterizations using ex-situ X-ray diffraction and ex-situ X-ray photoelectron spectroscopy reveal co-intercalation of H^(+)and Zn^(2+)in the V_(2)O_(3)/VO_(2)@S/N-C *** to the presence of S_(2)^(2-),more phases changed to V_(10)O_(24).12H_(2)O,making the V_(2)O_(3)/VO_(2)@S/N-C electrode better *** elucidating the zinc storage mechanism and demonstrating the stable performance of the doped electrode,this work contributes valuable insights into the optimization of the electrode materials for future energy storage solutions.

关键词： S/N co-doping Biphasic mixed valence vanadium oxides Aqueous zinc-ion battery V_(10)O_(24)·12H_(2)O