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Yet More Elementary Proof of Matrix-Tree Theorem for Signed Graphs

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Algebra Colloquium 2023年第3期30卷 493-502页

作者： Shu Li jianfeng wang School of Mathematics and Statistics Shandong University of TechnologyZiboShandong 255049China

A signed graph G˙=(G,σ)is a graph G=(V(G),E(G))with vertex set V(G)and edge set E(G),together with a functionσ:E→{+1,−1}assigning a positive or negative sign to each *** this paper,we present a more elementary proof for the matrix-tree theorem of signed graphs,which is based on the relations between the incidence matrices and the Laplcians of signed *** an application,we also obtain the results of Monfared and Mallik about the matrix-tree theorem of graphs for signless Laplacians.

关键词： signed graph matrix-tree theorem Laplacian signless Laplacian incidence matrix

Blockchain-based multiple groups data sharing with anonymity and traceability

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Science China(Information Sciences) 2020年第3期63卷 7-19页

作者： Hui HUANG Xiaofeng CHEN jianfeng wang State Key Laboratory of Integrated Service Networks (ISN) Xidian University College of Computer Minnan Normal University

Group data sharing enables information sharing between multiple parties for cooperative purposes. However, the existing schemes only consider scenarios in which all parties in the same organization want to share data. Achieving secure data sharing between users of different groups is also a relevant research issue. In this paper, we propose a blockchain-based data sharing scheme for multiple groups with anonymity and traceability. Owing to the consortium blockchain technique, any user in the system can easily verify the validity of the shared data without interacting with a third-party auditor. Additionally, the proposed scheme can not only enable data sharing between different groups with enhanced security anonymously but also achieve traceability and non-frameability.

关键词： multiple groups data sharing blockchain anonymity traceability

The Spectrum and Automorphism Group of the Set-Inclusion Graph

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Algebra Colloquium 2021年第3期28卷 497-506页

作者： Xueyi Huang Qiongxiang Huang jianfeng wang Department of Mathematics East China University of Science and Technology Shanghai 200237China College of Mathematics and Systems Science Xinjiang University UrumqiXinjiang 830046China School of Mathematics and Statistics Shandong University of Technology ZiboShandong 255049China

Let n,k and l be integers with 1≤k 详细信息

Let n,k and l be integers with 1≤k

关键词： set-inclusion graph spectrum automorphism group

Constitutive modelling of idealised granular materials using machine learning method

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第4期15卷 1038-1051页

作者： Mengmeng Wu Zhangqi Xia jianfeng wang Department of Architecture and Civil Engineering City University of Hong KongHong KongChina Shenzhen Research Institute of City University of Hong Kong ShenzhenChina

Predicting the constitutive response of granular soils is a fundamental goal in *** paper presents a machine learning(ML)framework for the prediction of the stress-strain behaviour and shearinduced contact fabric evolution of an idealised granular material subject to triaxial *** MLbased framework is comprised of a set of mini-triaxial tests which provide a benchmark for the setup and validation of the discrete element method(DEM)model of the granular materials,a parametric DEM simulation programme of virtual triaxial tests which provides datasets of micro-and macro-mechanical information,as well as a multi-layer perceptron(MLP)neural network which is trained and tested using the DEM-based *** ML model only requires the initial void ratio of the granular sample as the input for predicting its constitutive *** excellent agreement between the ML model prediction and experimental test and DEM simulation results indicates that the MLebased modelling approach is capable of capturing accurately the effects of initial void ratio on the constitutive behaviour of idealised granular materials,bypassing the need to incorporate the complex micromechanics underlying the macroscopic mechanical behaviour of granular ***,a detailed comparison between the used MLP model and long short-term memory(LSTM)model was made from the perspective of technical algorithm,prediction accuracy,and computational efficiency.

关键词： Machine learning(ML) Multi-layer perceptron(MLP) Contact fabric Granular material Discrete element method(DEM)

Environmental standards and beneficial uses of waste-to-energy(WTE)residues in civil engineering applications

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Waste Disposal and Sustainable Energy 2023年第3期5卷 323-350页

作者： Yixi Tian Shengwei Dai jianfeng wang Department of Materials Science and Engineering Massachusetts Institute of Technology77 Massachusetts Avenue CambridgeCambridgeMA02139USA Department of Chemical Engineering Columbia UniversityNew YorkNY10027USA Department of Earth and Environmental Engineering Columbia UniversityNew YorkNY10027USA

The waste-to-energy(WTE)technologies are now recovering energy and materials from over 300 million tonnes of municipal solid wastes *** studies have investigated substituting natural construction materials with WTE residues to relieve the environmental cost of natural resource *** study examined the beneficial uses of WTE residues in civil engineering applications and the corresponding environmental standards in Europe,the U.S.,and *** review presents the opportunities and challenges for current technical approaches and the environmental standards to be met to stabilize WTE *** principal characteristics of WTE residues(bottom ash and fly ash)and the possible solutions for their beneficial use in developed and developing countries are *** leaching procedures and environmental standards for pH,heavy metals,and polychlorinated dibenzo-p-dioxins/furans(PCDD/Fs)are *** current practice and engineering properties of materials using WTE residues,including mixtures with stone aggregate or sand,cement-based or hot-mix asphalt concrete(pavement),fill material in the embankments,substitute of Portland cement or clinker production,and ceramic-based materials(bricks and lightweight aggregate)are comprehensively reviewed.

关键词： Waste-to-energy(WTE) Bottom ash Fly ash Construction building materials Civil engineering applications Leaching standards

Capability of discrete element method to investigate the macro-micro mechanical behaviours of granular soils considering different stress conditions and morphological gene mutation

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第10期15卷 2731-2745页

作者： Wei Xiong jianfeng wang Zhuang Cheng Department of Architecture and Civil Engineering City University of Hong KongHong KongChina Shenzhen Research Institute of City University of Hong Kong ShenzhenChina School of Civil Engineering and Architecture Wuhan University of TechnologyWuhanChina Sanya Science and Education Innovation Park Wuhan University of TechnologySanyaChina

Discrete element method(DEM)has been widely utilised to model the mechanical behaviours of granular ***,with simplified particle morphology or rheology-based rolling resistance models,DEM failed to describe some responses,such as the particle kinematics at the grain-scale and the principal stress ratio against axial strain at the *** paper adopts a computed tomography(CT)-based DEM technique,including particle morphology data acquisition from micro-CT(mCT),spherical harmonic-based principal component analysis(SH-PCA)-based particle morphology reconstruction and DEM simulations,to investigate the capability of DEM with realistic particle morphology for modelling granular soils’micro-macro mechanical responses with a consideration of the initial packing state,the morphological gene mutation degree,and the confining stress *** is found that DEM with realistic particle morphology can reasonably reproduce granular materials’micro-macro mechanical behaviours,including the deviatoric stressevolumetric straineaxial strain response,critical state behaviour,particle kinematics,and shear band ***,the role of multiscale particle morphology in granular soils depends on the initial packing state and the confining stress *** the same granular soils,rougher particle surfaces with a denser initial packing state and a higher confining stress condition result in a higher degree of shear strain localisation.

关键词： Discrete element method(DEM) Spherical harmonic-based principal component analysis(SH-PCA) Particle morphology Granular so

Tide-Induced Mixing in the Bottom Boundary Layer in the Western East China Sea

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Journal of Ocean University of China 2023年第1期22卷 1-8页

作者： GUO Zheng CAO Anzhou wang jianfeng Marine Science and Technology College Zhejiang Ocean UniversityZhoushan 316022China Ocean College Zhejiang UniversityZhoushan 316021China Institute of Oceanology Chinese Academy of SciencesQingdao 266071China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

The East China Sea(ECS)boasts a vast continental shelf,where strong tidal motions play an important role in the substance transport and energy *** this study,the tide-induced mixing in the bottom boundary layer in the western ECS is analyzed based on records measured by moored acoustic Doppler current profilers from June to October *** show that the M_(2) tide is strong and shows a barotropic feature,whereas the O_(1) tide is much *** on the M_(2) tidal currents,the eddy viscosity in the bottom Ekman boundary layer is estimated with three *** estimated eddy viscosity values vary within 10^(-4)–10^(-2)m^(2) s^(−1),reaching a maximum at approximately 5 m height from the bottom and decreasing exponentially with the height at all three ***,the shear production of turbulent kinetic energy is calculated to quantify the mixing induced by different tidal *** results show that the shear production of the M_(2) tide is much stronger than that of the O_(1) tide and shows a bottom intensified feature.

关键词： tides East China Sea bottom boundary layer mixing eddy viscosity

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Enhancing Fe content tolerance in A356 alloys for achieving low carbon footprint aluminum structure castings

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Journal of Materials Science & Technology 2023年第30期161卷 180-191页

作者： Guodong Niu jianfeng wang Jinwen Ye Jian Mao College of Materials Science and Engineering Sichuan UniversityChengdu 610065China China Science Lab General Motor’s Global Research and DevelopmentShanghai 201206China

Low carbon footprint aluminum structure castings are the mainstream development direction of alu-minum alloys in the *** the Fe content tolerance upper limit in casting aluminum alloys is considered an effective way to promote the application of recycled aluminum *** this work,it was found that with the Ce and TiCN NPs(nanoparticles)addition simultaneously to A356 alloys,the acicular Fe-rich phases(β-Al 5 FeSi)which damages the properties can be changed into beneficial phases(core-shell heterostructures)for the alloy,and hence the mechanical properties of A356 alloys can be *** TiCN nanoparticles and rare element Ce play crucial roles in the formation of core-shell *** formation mechanism of core-shell heterostructure was also systematically researched from the perspective of thermodynamics and *** study provides a simple and feasible strategy to eliminate the harmful effects of Fe impurity and contributes to the industrialization of low carbon footprint aluminum structure castings.

关键词： A356 casting aluminum alloys Heterostructure Carbon neutral TiCN nano particles Mechanical properties

Numerical simulation of Marangoni effects of single drops induced by interphase mass transfer in liquid-liquid extraction systems by the level set method

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Science China Chemistry 2008年第7期51卷 684-694页

作者： wang jianfeng YANG Chao MAO ZaiSha Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Department of Chemical Engineering Zhengzhou UniversityZhengzhou 450052China

The mathematical model of mass transfer-induced Marangoni effect is formulated. The drop surface evolution is captured by the level set method, in which the interface is represented by the embedded set of zero level of a scalar distance function defined in the whole computational domain. Numerical simulation of the Marangoni effect induced by interphase mass transfer to/from deformable single drops in unsteady motion in liquid-liquid extraction systems is performed in a Eulerian axisymmetric reference frame. The occurrence and development of the Marangoni effect are simulated, and the re- sults are in good agreement with the classical theoretical analysis and previous simulation.

关键词： Marangoni effect level set method mass transfer numerical simulation drop

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