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Simultaneous desulfurization and denitrification of flue gas by pre-ozonation combined with ammonia absorption

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Chinese Journal of Chemical Engineering 2020年第9期28卷 2457-2466页

作者： baowei wang Shumei Yao Yeping Peng Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

A process of simultaneous desulfurization and denitrification of flue gas was conducted in this *** flue gas containing 200 mg·m^-3NO,1000-4000 mg·m^-3SO(2,)3%-9%O(2)and 10%-20%CO(2)was first oxidized b(y)O3 and then absorbed by ammonia in a bubbling *** the ammonia concentration or the SO2 content in flue gas can promote the absorption of NOx and extend the effective absorption *** the contrary,both increasing the absorbent temperature or the O(2)content shorten the effective absorption time of NO((x.))The change of solution pH had substantial influence on NOx *** the presence of CO(2)the NOx removal efficiency reached 89.2%when the absorbent temperature was raised to 60℃and the effective absorption time can be maintained for 8 h,which attribute to the buffering effect in the ***,both the addition of Na(2)S2 O3 and urea can promote the NOx removal efficiency when the absorbent temperature is 25℃and the addition of Na(2)S2 O3 had achieved better *** advantage of adding Na(2)S2 O3 became less evident at higher absorbent temperature and coexistence of CO(2.)In all experiments,SO(2)removal efficiency was always above 99%,and it was basically not affected by the above factors.

关键词： Flue gas Ammonia absorption Desulfurization Denitrification Pre-ozonation

Metal oxide particle electrodes for degradation of high concentration phenol wastewater via electrocatalytic advanced oxidation

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Chinese Journal of Chemical Engineering 2024年第11期75卷 204-213页

作者： baowei wang Yi Liao Tingting wang Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

High-concentration phenol wastewater is pollutant of concern that pose significant risks to human health and the ***-dimensional electrocatalytic oxidation is one of the most promising wastewater treatment technologies because of its high treatment efficiency,low energy consumption and low secondary ***-cost and higher-performance particles still faces great *** this work,metal oxide particle electrodes were prepared using granular activated carbon(GAC)as a substrate to study the degradation of phenol by three-dimensional electrocatalytic *** particle electrodes loaded with different monometallic oxides(Mn,Fe,Co,Ce)and bimetallic oxides(Fe and Ce)were prepared by the impregnation *** effectiveness of the particle electrodes in degrading phenol was greatly improved after active components *** all monometallic oxide particle electrodes,the concentration degradation efficiency was in the order of Ce/GAC>Co/GAC>Mn/GAC>Fe/GAC,and the COD degradation efficiency was Ce/GAC>Fe/GAC>Co/GAC>Mn/*** optimizing the loading metal type and loading amount,it was found that the 1.1%Fe-2.7%Ce/GAC particle electrode perform the best,with a phenol degradation efficiency of 95.48%,a COD degradation rate of 94.35%,an energy consumption of 0.75 kW·h·kg^(-1)*** lower-cost and higher-performance particle highlights a reliable route for solving the problem of particle electrode materials limiting the efficient treatment of phenol-containing wastewater.

关键词： Phenol degradation Electrocatalytic oxidation Three-dimensional electrochemical Particle electrode Advanced oxidation

Virtual Assembly Collision Detection Algorithm Using Backpropagation Neural Network

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Computers, Materials & Continua 2024年第10期81卷 1085-1100页

作者： baowei wang Wen You School of Computer Nanjing University of Information Science and TechnologyCollaborative Innovation Center of Jiangsu Atmospheric Environment and Equipment TechnologyDigital Forensics Engineering Research Center of Digital Forensics Ministry of EducationNanjing210044China School of Software Nanjing University of Information Science and TechnologyNanjing210044China

As computer graphics technology continues to advance,Collision Detection(CD)has emerged as a critical element in fields such as virtual reality,computer graphics,and interactive *** is indispensable for ensuring the fidelity of physical interactions and the realism of virtual environments,particularly within complex scenarios like virtual assembly,where both high precision and real-time responsiveness are *** ongoing developments,current CD techniques often fall short in meeting these stringent requirements,resulting in inefficiencies and inaccuracies that impede the overall performance of virtual assembly *** address these limitations,this study introduces a novel algorithm that leverages the capabilities of a Backpropagation Neural Network(BPNN)to optimize the structural composition of the Hybrid Bounding Volume Tree(HBVT).Through this optimization,the research proposes a refined Hybrid Hierarchical Bounding Box(HHBB)framework,which is specifically designed to enhance the computational efficiency and precision of CD *** HHBB framework strategically reduces the complexity of collision detection computations,thereby enabling more rapid and accurate responses to collision *** experimental validation within virtual assembly environments reveals that the proposed algorithm markedly improves the performance of CD,particularly in handling complex *** optimized HBVT architecture not only accelerates the speed of collision detection but also significantly diminishes error rates,presenting a robust and scalable solution for real-time applications in intricate virtual *** findings suggest that the proposed approach offers a substantial advancement in CD technology,with broad implications for its application in virtual reality,computer graphics,and related fields.

关键词： Collision detection virtual assembly backpropagation neural network real-time interactivity

Shrinking target problems for beta-dynamical system

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Science China Mathematics 2013年第1期56卷 91-104页

作者： SHEN LuMing wang baowei College of Science Hunan Agricultural University School of Mathematics and Statistics Huazhong University of Science and Technology Lamfa-cnrs umr 6140 Université de Picardie Jules Verne33 rue Saint Leu80039 AmiensFrance

For any β 〉 1, let （[0, 1],Tβ） be the beta dynamical system. For a positive function ψ ： N → R＋ and a real number x0 E [0, 1], we define D（Tβ, ψ, xo） the set of ψ-well approximable points by xo as {x C [0, 1] ： ]Tβ^nx - x0｜（ψ（n） for infinitely many n ∈ N}.In this note, by proving a structure lemma that any ball B（x, r） contains a regular cylinder of comparable length with r, we determine the Hausdorff dimension of the set D（Tβ, ψb, x0） completely for any β 〉 1 and any positive function ψ.

关键词： β -dynamical system shrinking target problems Hausdorff dimension

Efficient Algorithm for K-Barrier Coverage Based on Integer Linear Programming

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China Communications 2016年第7期13卷 16-23页

作者： Yanhua Zhang Xingming Sun baowei wang Nanjing University of Information Science&Technology NanjingChina Jiangsu Lightning Protection Center NanjingChina

Barrier coverage of wireless sensor networks is an important issue in the detection of intruders who are attempting to cross a region of ***,in certain applications,barrier coverage cannot be satisfied after random *** this paper,we study how mobile sensors can be efficiently relocated to achieve k-barrier *** particular,two problems are studied:relocation of sensors with minimum number of mobile sensors and formation of k-barrier coverage with minimum energy *** two problems were formulated as 0–1 integer linear programming(ILP).The formulation is computationally intractable because of integrality and complicated ***,we relax the integrality and complicated constraints of the formulation and construct a special model known as RELAX-RSMN with a totally unimodular constraint coefficient matrix to solve the relaxed 0–1 ILP rapidly through linear *** analysis and simulation were performed to verify the effectiveness of our approach.

关键词： k-barrier coverage linear programming wireless sensor networks

The distribution of the large partial quotients in continued fraction expansions

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Science China Mathematics 2023年第5期66卷 935-956页

作者： Bo Tan Chen Tian baowei wang School of Mathematics and Statistics Huazhong University of Science and TechnologyWuhan 430074China

The existence of large partial quotients destroys many limit theorems in the metric theory of continued *** achieve some variant forms of limit theorems,a common approach mostly used in practice is to discard the largest partial quotient,while this approach works in obtaining limit theorems only when there cannot exist two terms of large partial quotients in a metric *** by this,we are led to consider the metric theory of points with at least two large partial *** precisely,denoting by[a1(x),a2(x),...]the continued fraction expansion of x∈[0,1)and lettingψ:N→R+be a positive function tending to in nity as n→∞,we present a complete characterization on the metric properties of the set,i.e.,E(ψ)={x∈[0,1):∃16 k̸=ℓ6 n,ak(x)>ψ(n),aℓ(x)>ψ(n)for in nitely many n∈N}in the sense of the Lebesgue measure(the Borel-Bernstein type result)and the Hausdor dimension(the Jarnik type result).The main result implies that any nite deletion from a1(x)+……+an(x)cannot result in a law of large numbers.

关键词： continued fraction Hausdor dimension Borel-Bernstein theorem

Distribution of Electrical Field Energy for Conversion of Methane to C_2 Hydrocarbons via Dissymmetrical Electric Field Enhanced Plasma

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Journal of Natural Gas Chemistry 2006年第2期15卷 115-121页

作者： baowei wang Genhui XU Hongwei Sun Key Laboratory for Green Chemical Technology School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Research Institute of Petroleum Processing Beijing 100083 China

Direct conversion of methane into C2 hydrocarbons through alternating current electric field enhanced plasma was studied under room temperature, atmospheric pressure and low power conditions. The distribution of electrical field intensity and distribution of energy were calculated with software that was developed by us according to the charge simulation method. The results indicated that the energy of tip of electrode was 0.36 J/mm^3 and it was higher than the methane dissociation energy （0.0553 J/mm^3）. The methane located at this area can be activated easily. The higher-energy particles produced by dissociation collided with molecules around them and initiated consecutive reactions between free radicals and molecules. The method was proved to be valided and could be taken as a basis for the electrical field study concerned.

关键词： electrical field enhanced plasma intensity of electrical field distribution of energy

Methane conversion into higher hydrocarbons with dielectric barrier discharge micro-plasma reactor

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Journal of Energy Chemistry 2013年第6期22卷 876-882页

作者： baowei wang Wenjuan Yan Wenjie Ge Xiaofei Duan Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and Technology Tianjin University

We reported a coaxial,micro-dielectric barrier discharge(micro-DBD)reactor and a conventional DBD reactor for the direct conversion of methane into higher hydrocarbons at atmospheric *** effects of input power,residence time,discharge gap and external electrode length were investigated for methane conversion and product *** found the conversion of methane in a micro-DBD reactor was higher than that in a conventional DBD *** at an input power of 25.0 W,the conversion of methane and the total C2+C3 selectivity reached 25.10% and 80.27%,respectively,with a micro-DBD reactor of 0.4 mm discharge ***,a nonlinear multiple regression model was used to study the correlations between both methane conversion and product selectivity and various system *** calculated data were obtained using SPSS 12.0 *** regression analysis illustrated the correlations between system variables and both methane conversion and product selectivity.

关键词： dielectric barrier discharge hydrocarbons methane micro-reactor plasma

A Zero-Watermark Scheme Based on Quaternion Generalized Fourier Descriptor for Multiple Images

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Computers, Materials & Continua 2022年第5期71卷 2633-2652页

作者： baowei wang Weishen wang Peng Zhao Naixue Xiong School of Computer Science Nanjing University of Information Science and TechnologyNanjing210044China Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET) Nanjing210044China Engineering Research Center of Digital Forensics Ministry of EducationNanjing210044China Department of Mathematics and Computer Science Northeastern State UniversityTahlequahOK74464USA

Most of the existing zero-watermark schemes for medical images are only appropriate for a single grayscale *** they protect a large number of medical images,repeating operations will cause a significant amount of time and storage ***,this paper proposes an efficient zero-watermark scheme for multiple color medical images based on quaternion generalized Fourier descriptor(QGFD).Firstly,QGFD is utilized to compute the feature invariants of each color image,then the representative features of each image are selected,stacked,and reshaped to generate a feature matrix,which is then binarized to get a binary feature *** information can be converted into the copyright image by using QR code technology,which contains more ***,the zero-watermark image is constructed by executing the XOR operation on the copyright image and the feature image scrambled by the Cat *** the experiment,different parameters are selected to determine the maximum number of images that the proposed scheme can protect simultaneously while achieving good *** experimental results demonstrate that the proposed scheme can effectively resist common attacks,geometric attacks and joint attacks,and effectively improve the operation efficiency of the algorithm,thus effectively decreasing the time and storage cost of copyright protection for lots of medical images.

关键词： Copyright protection color medical image zero-watermark QGFD