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SSRN 2023年

作者： Yang, Kangquan Zhong, Xianwei Cai, Kui Yan, Yuanyang Yin, Xinyu Pi, Pihui Nong, Yunjun Wen, Xiufang School of Chemistry and Chemical Engineering South China University of Technology Guangzhou510640 China Hunan University of Technology and Business Changsha China Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals Institute of Analysis Guangdong Academy of Sciences China National Analytical Center Guangzhou China

Superwetting materials are considered to have great potential for oil-water separation in water purification, food processing, petrochemical production, etc. However, the weak demulsification ability is the key challenge in most practical applications. Here, a charged beetle-structured copper foam with excellent demulsification ability is successfully prepared for ultrafast demulsification and separation of oil-in-water emulsions, the separation efficiency for various anionic surfactant-stabilized oil-in-water emulsions is up to 99.2%, and the permeation flux driven only by gravity reaches 27,734.0 L m-2 h-1. Molecular dynamics simulation results indicated that this copper foam can provide electrostatic force and wetting drive force in different directions for the anionic surfactant and oil via surface charge and composite wettability, and achieve charge heterogeneity and severe deformation of droplets for enhanced demulsification. Therefore, this charged beetle structure provides a new perspective for developing advanced materials for demulsification and separation in the petroleum industry and water purification fields. © 2023, The Authors. All rights reserved.

关键词： Purification

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Simulating the Turbulent Hydrothermal Behavior of Oil/MWCNT Nanofluid in a Solar Channel Heat Exchanger Equipped with Vortex Generators

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Computer modeling in engineering & Sciences 2021年第3期126卷 855-889页

作者： Rachid Maouedj Younes Menni Mustafa Inc Yu-Ming Chu Houari Ameur Giulio Lorenzini Unite de Recherche en Energies Renouvelables en Milieu Saharien URERMSCentre de Developpement des Energies RenouvelablesCDERAdrar01000Algeria Department of Physics Unit of Research on Materials and Renewable EnergiesFaculty of SciencesAbou Bekr Belkaid UniversityTlemcen13000Algeria Department of Mathematics Science FacultyFirat UniversityElazig23119Turkey Department of Medical Research China Medical University HospitalChina Medical UniversityTaichung40402Taiwan Department of Mathematics Huzhou UniversityHuzhou313000China Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering Changsha University of Science&TechnologyChangsha410114China Department of Technology University Centre of NaamaNaama45000Algeria Department of Engineering and Architecture University of ParmaParco Area delle Scienze 181/AParma43124Italy

Re-engineering the channel heat exchangers(CHEs)is the goal of many recent studies,due to their great importance in the scope of energy transport in various industrial and environmental *** the internal geometry of the CHEs by using extended surfaces,i.e.,VGs(vortex generators),is the most common technique to enhance the efficiency of heat *** work aims to develop a newdesign of solar collectors to improve the overall energy *** study presents a new channel design by introducing *** FVM(finite volume method)was adopted as a numerical technique to solve the problem,with the use of Oil/MWCNT(oil/multi-walled carbon nano-tubes)nanofluid to raise the thermal conductivity of the flow *** study is achieved for a Re number ranging from12×10^(3) to 27×10^(3),while the concentration(φ)of solid particles in the fluid(Oil)is set to 4%.The computational results showed that the hydrothermal characteristics depend strongly on the flow patterns with the presence of VGs within the *** the Oil/MWCNT rates with the presence of VGs generates negative turbulent velocities with high amounts,which promotes the good agitation of nanofluid particles,resulting in enhanced great transfer rates.

关键词： Channel heat exchanger forced-convection Oil/MWCNT nanofluid CFD vortex generators

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Feasible strategies in three-way conflict analysis with three-valued ratings

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International Journal of Approximate Reasoning 2025年 186卷

作者： Jing Liu Mengjun Hu Guangming Lang School of Mathematics and Statistics Changsha University of Science and Technology Changsha Hunan 410114 PR China Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering Changsha University of Science and Technology Changsha Hunan 410114 PR China Department of Mathematics and Computing Science Saint Mary's University Halifax Nova Scotia B3H 3C3 Canada

Most existing work on three-way conflict analysis has focused on trisecting agent pairs, agents, or issues. While these trisections lay the groundwork for understanding the nature of conflicts, further actions need to be formulated to address conflict resolution. One of the widely studied approaches is to construct feasible strategies. This paper aims to investigate feasible strategies from two perspectives of consistency and non-consistency. Particularly, we begin with computing the overall rating of a clique of agents based on positive and negative similarity degrees. Afterwards, considering the weights of both agents and issues, we propose weighted consistency and non-consistency measures, which are respectively used to identify the feasible strategies for a clique of agents. Algorithms are developed to identify feasible strategies, L -order feasible strategies, and the corresponding optimal ones. Finally, to demonstrate the practicality, effectiveness, and superiority of the proposed models, we apply them to two commonly used case studies on NBA labor negotiations and development plans for Gansu Province and conduct a sensitivity analysis on parameters and a comparative analysis with existing state-of-the-art conflict analysis approaches. The comparison results demonstrate that our conflict resolution models outperform the conventional approaches by unifying weighted agent-issue evaluation with consistency and non-consistency measures to enable the systematic identification of not only feasible strategies but also optimal solutions.

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Computational analysis of the Oscillatory Mixed Convection Flow along a Horizontal Circular Cylinder in Thermally Stratified Medium

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Computers, Materials & Continua 2020年第10期65卷 109-123页

作者： Zia Ullah Muhammad Ashraf Saqib Zia Yuming Chu Ilyas Khan Kottakkaran Sooppy Nisar Department of Mathematics Faculty of ScienceUniversity of SargodhaSargodhaPakistan Department of Mathematics COMSATS University IslamabadIslamabad44000Pakistan Department of Mathematics Huzhou UniversityHuzhou313000China Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering Changsha University of Science&TechnologyChangsha410114China Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh72915Vietnam Department of Mathematics College of Arts and SciencesPrince Sattam bin Abdulaziz UniversityWadi Aldawaser11991Saudi Arabia

The present work emphasizes the significance of oscillatory mixed convection stratified fluid and heat transfer characteristics at different stations of non-conducting horizontally circular cylinder in the presence of thermally stratified *** remove the difficulties in illustrating the coupled PDE’s,the finite-difference scheme with efficient primitive-variable formulation is proposed to transform dimensionless *** numerical simulations of coupled non-dimensional equations are computed in terms velocity of fluid,temperature and magnetic field which are computed to examine the fluctuating components of skin friction,heat transfer and current density for various emerging *** governing parameters namely,thermally stratification parameter𝑆𝑆𝑡𝑡,mixed-convection parameter𝜆𝜆,Prandtl number Pr,magnetic force parameter𝜉𝜉and magnetic-Prandtl number𝛾𝛾are displayed graphically at selected values for velocity and heat transfer *** is computed that heat transfer attains maximum amplitude and good variations in the presence of thermally stratified parameter at each position𝛼𝛼=𝜋𝜋6⁄,𝛼𝛼=𝜋𝜋3⁄and𝛼𝛼=𝜋𝜋around the surface of non-conducting horizontally *** velocity of fluid attains certain height at station𝛼𝛼=𝜋𝜋6⁄for higher value of stratification *** is also found that the temperature gradient decreases with stratification parameter𝑆𝑆𝑡𝑡,but it increases after a certain distance𝑌𝑌from the *** novelty of the current work is that due to non-conducting phenomena the magnetic effects are strongly observed far from the surface but exact at the surface are zero for each position.

关键词： Mixed-convection oscillatory stratified flow non-conducting cylinder thermal stratification heat transfer.

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Watchdog from academia: Do academic independent directors matter for financial statement fraud?

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International Review of Economics and Finance 2025年 101卷

作者： Wen, Shigang Li, Jianping Huang, Chuangxia Zhu, Xiaoqian School of Management Guangdong University of Technology Guangzhou 510520 China School of Economics and Management University of Chinese Academy of Sciences Beijing 100190 China MOE Social Science Laboratory of Digital Economic Forecasts and Policy Simulation at UCAS Beijing 100190 China School of Mathematics and Statistics Changsha University of Science and Technology Hunan Changsha 410114 China Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering Hunan Changsha 410114 China

We examine whether academic independent directors affect financial statement fraud. Using a sample of independent directors’ academic experience data for Chinese public firms, we find a significantly negative relation between academic independent directors and financial statement fraud. This finding is robust after applying various methods to address potential endogeneity concerns. Further analyses suggest that the negative relation between academic independent directors and financial statement fraud is more pronounced when academic independent directors are professors and possess accounting and technological expertise, sit on audit committees, compensation committees, multiple boards, and have relatively low-level compensation. In addition, the negative relation is stronger for non-state-owned firms and firms audited by small auditors. Overall, our findings suggest that academic independent directors are watchdogs for financial statement fraud. © The Authors

关键词： Academic independent director Board committee Compensation Corporate governance Financial statement fraud Professor

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Computational analysis of the Effect of Nano Particle Material Motion on Mixed Convection Flow in the Presence of Heat Generation and Absorption

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Computers, Materials & Continua 2020年第11期65卷 1809-1823页

作者： Muhammad Ashraf Amir Abbas Saqib Zia Yu-Ming Chu Ilyas Khan Kottakkaran Sooppy Nisar Department of Mathematics Faculty of ScienceUniversity of SargodhaSargodha40100Pakistan Department of Mathematics COMSATS University IslamabadIslamabad44000Pakistan Department of Mathematics Huzhou UniversityHuzhou313000China Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering Changsha University of Science&TechnologyChangsha410114China Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh City72915Vietnam Department of Mathematics College of Arts and SciencesPrince Sattam bin Abdulaziz UniversityWadi Aldawaser11991Saudi Arabia

The present study is concerned with the physical behavior of the combined effect of nano particle material motion and heat generation/absorption due to the effect of different parameters involved in prescribed flow *** formulation of the flow model is based on basic universal equations of conservation of momentum,energy and *** prescribed flow model is converted to non-dimensional form by using suitable *** obtained transformed equations are solved numerically by using finite difference *** the analysis of above said behavior the computed numerical data for fluid velocity,temperature profile,and mass concentration for several constraints that is mixed convection parameterλt,modified mixed convection parameterλc,Prandtl number Pr,heat generation/absorption parameterδ,Schmidt number Sc,thermophoresis parameter Nt,and thermophoretic coefficient k are sketched in graphical *** results for skin friction,heat transfer rate and the mass transfer rate are tabulated for various emerging physical *** is reported that in enhancement in heat,generation boosts up the fluid temperature at some positions of the surface of the *** heat absorption parameter is decreased temperature field increases at position X=π/4 on the other hand,no alteration at other considered circumferential positions is noticed.

关键词： Nano material mixed convection finite difference method heat generation/absorption spheres

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A New Idea of Fractal-Fractional Derivative with Power Law Kernel for Free Convection Heat Transfer in a Channel Flow between Two Static Upright Parallel Plates

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Computers, Materials & Continua 2020年第11期65卷 1237-1251页

作者： Dolat Khan Gohar Ali Arshad Khan Ilyas Khan Yu-Ming Chu Kottakkaran Sooppy Nisar Department of Mathematics City University of Science and Information TechnologyPeshawar25000Pakistan Institute of Computer Sciences and Information Technology The University of AgriculturePeshawarPakistan Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh72915Vietnam Department of Mathematics Huzhou UniversityHuzhou313000China Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering Changsha University of Science&TechnologyChangsha410114China Department of Mathematics College of Arts and SciencesPrince Sattam bin Abdulaziz UniversityWadi Aldawaser11991Saudi Arabia

Nowadays some new ideas of fractional derivatives have been used successfully in the present research community to study different types of mathematical *** them,the significant models of fluids and heat or mass transfer are on *** recently a new idea of fractal-fractional derivative is introduced;however,it is not used for heat transfer in channel *** this article,we have studied this new idea of fractal fractional operators with power-law kernel for heat transfer in a fluid flow *** exactly,we have considered the free convection heat transfer for a Newtonian *** flow is bounded between two parallel static *** of the plates is heated *** proposed problem is modeled with a fractal fractional derivative operator with a power-law kernel and solved via the Laplace transform method to find out the exact *** results are graphically analyzed via MathCad-15 software to study the behavior of fractal parameters and fractional *** the influence of temperature and velocity profile,it is observed that the fractional parameter raised the velocity and temperature as compared to the fractal ***,a combined approach of fractal fractional explains the memory of the function better than fractional only.

关键词： Fractal-fractional derivative power law kernel convection heat transfer upright parallel plates

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Dynamical analysis and Exact Solutions of a New(2+1)-Dimensional Generalized Boussinesq Model Equation for Nonlinear Rossby Waves

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Communications in Theoretical Physics 2019年第9期71卷 1054-1062页

作者： Quan-Sheng Liu Zai-Yun Zhang Rui-Gang Zhang Chuang-Xia Huang School of Mathematical Sciences Inner Mongolia UniversityHohhot010021China School of Aeronautics Science and Engineering Beihang UniversityBeijing100191China School of Mathematics Hunan Institute of Science and TechnologyYueyang414006China Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering Changsha University of Scienceand Technology Changsha410014China School of Mathematics and Statistics Changsha University of Science and TechnologyChangsha410014China

In this paper, we study the higher dimensional nonlinear Rossby waves under the generalized beta *** methods of the multiple scales and weak nonlinear perturbation expansions [Q. S. Liu, et al., Phys. Lett. A383(2019) 514], we derive a new(2 + 1)-dimensional generalized Boussinesq equation from the barotropic potential vorticity equation. Based on bifurcation theory of planar dynamical systems and the qualitative theory of ordinary differential equations, the dynamical analysis and exact traveling wave solutions of the new generalized Boussinesq equation are obtained. Moreover, we provide the numerical simulations of these exact solutions under some conditions of all parameters. The numerical results show that these traveling wave solutions are all the Rossby solitary waves.

关键词： generalized Boussinesq model equation nonlinear Rossby waves dynamical analysis traveling wave solutions nonlinear perturbation expansions bifurcation theory of planar dynamical systems

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Dynamics and modeling of nonlinear forced convective flow of Carreau-fluid (non-Newtonian fluid) with Marangoni convection

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Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical engineering Science 2021年

作者： Ijaz Khan, M. Chu, Yu-Ming Qayyum, Sumaira Farooq, Shahid Aldabesh, A. Department of Mathematics Riphah International University Faisalabad Pakistan Department of Mathematics Huzhou University Huzhou China Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering Changsha University of Science $and$ Technology Changsha China Department of Mathematics Quaid-I-Azam University Islamabad Pakistan Department of Mechanical Engineering Faculty of Engineering Albaha University Al Bahah Saudi Arabia

This paper deals with Marangoni convective flow of Carreau fluid. Boundary condition for momentum equation is considered to be Marangoni type. Thermal energy produces when current passes through the electrical conductor and this process is called Joule heating. Viscous dissipation is also applied in thermal equation. Nonlinear mixed convection for temperature is considered. Governing equations of PDE's are converted to ODE's by implementation of transformation. ND-Solve MATHEMATICA method is used to solve the equations. Parameters result against temperature, velocity, entropy rate, Bejan number, Skin friction and Nusselt number is examined via graphs. Due to increase in fluid parameter velocity of the fluid reduces while increasing impact is seen for temperature. Temperature is increasing function of Eckert number. Entropy generation also shows rising impact via fluid parameter while Bejan number decays. Drag force of surface decays via fluid parameter. Nusselt number is in direct relation with Prandtl and Eckert number. © IMechE 2021.

关键词： Joule heating

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Skyrmions in nanorings: A versatile platform for skyrmionics

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Physical Review Applied 2023年第4期20卷 044039-044039页

作者： Dimitris Kechrakos Vito Puliafito Alejandro Riveros Jiahao Liu Wanjun Jiang Mario Carpentieri Riccardo Tomasello Giovanni Finocchio Physics Laboratory Department of Education School of Pedagogical and Technological Education (ASPETE) Athens Greece Department of Electrical and Information Engineering Technical University of Bari Bari 70125 Italy Escuela de Ingeniería Universidad Central de Chile Santiago 8330601 Chile Department of Mathematical and Computer Sciences Physical Sciences and Earth Sciences University of Messina Messina I-98166 Italy State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 China Frontier Science Center for Quantum Information Tsinghua University Beijing 100084 China College of Advanced Interdisciplinary Studies & Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices National University of Defense Technology Changsha Hunan 410073 China

The dynamical properties of skyrmions can be exploited to build devices with new functionalities. Here, we first investigate a skyrmion-based ring-shaped device by means of micromagnetic simulations and Thiele’s equation. We subsequently show three application scenarios: (1) a clock with tunable frequency that is biased with an electrical current having a radial spatial distribution, (2) an alternator, where the skyrmion circular motion driven by an engineered anisotropy gradient is converted into an electrical signal, and (3) an energy harvester, where the skyrmion motion driven by a thermal gradient is converted into an electrical signal, thus providing a heat recovery operation. We also show how to precisely tune the frequency and amplitude of the output electrical signals by varying material parameters, geometrical parameters, and number and velocity of skyrmions, and we further prove the correct device functionality under realistic conditions of room temperature and internal material defects. Our results open an alternative route for the realization of energy efficient nanoscale clocks, generators, and energy harvesters.

关键词： Skyrmions Spintronics Ferromagnets Micromagnetic modeling Thiele equation

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