Article
Engineering, Multidisciplinary
K. Zonoubi, B. Movahedian, M. Azhari
Summary: This paper presents a modified radial integration boundary elements method for analyzing two-dimensional elastodynamic problems. The method can handle problems with concave shapes and uses two-time marching schemes. The performance of the method is examined through numerical examples.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Article
Engineering, Multidisciplinary
K. Zonoubi, B. Movahedian, M. Azhari
Summary: This paper presents the elastodynamic analysis of axisymmetric bodies under axisymmetric dynamic loads using the modified radial integration boundary elements method (MRIBEM). The governing integral equations are derived in cylindrical coordinates using the 3D static fundamental solution. The proposed method simplifies the analysis by treating the axisymmetric bodies as a 2D problem with a one-dimensional boundary mesh and approximating the domain variables using global radial basis functions (RBFs).
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Engineering, Multidisciplinary
Leilei Chen, Kunpeng Li, Xuan Peng, Haojie Lian, Xiao Lin, Zhuojia Fu
Summary: This paper introduces an isogeometric boundary element method (IGABEM) for transient heat conduction analysis, utilizing Non-Uniform Rational B-spline (NURBS) basis functions for geometry construction and discretization of physical unknowns in governing equations. Bezier extraction technique and radial integration method are employed for efficient computation, demonstrating the advantages of IGABEM in dimension reduction and seamless integration between CAD and numerical analysis.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2021)
Article
Mathematics, Applied
J. Querales, P. Venegas
Summary: This paper studies the numerical approximation of mixed formulations for the acoustic eigenvalue problem with axial symmetry and introduces two mixed formulations to avoid spurious modes. The proposed method based on the Raviart-Thomas mixed method is analyzed and shown to have convergence and quasi-optimal order error estimates, which are supported by numerical results.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2022)
Article
Engineering, Multidisciplinary
Yongsong Li, Xiaomeng Yin, Yanming Xu
Summary: In this study, the isogeometric boundary element technique (IGABEM) is introduced for steady-state inhomogeneous heat conduction analysis. The physical unknowns in the boundary integral formulations are discretized using non-uniform rational B-spline (NURBS) basis functions to represent the geometry of the structures. The numerical examples demonstrate the potential of IGABEM for dimension reduction and smooth integration of CAD and numerical analysis.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2022)
Article
Computer Science, Interdisciplinary Applications
Yasaman Lotfi, Kourosh Parand, Kamal Rashedi, Jamal Amani Rad
Summary: This paper investigates the inverse one-phase one-dimensional Stefan problem to study thermal processes with phase change in moving boundary problems. A numerical method is proposed to calculate temperature distribution and approximate the temperature and heat flux at the boundary. By transforming the domain and discretizing the time dimension using finite-difference schemes, the spatial unknown function is approximated using radial basis function collocation technique, and linear systems of algebraic equations are solved using LU factorization method. The proposed method is validated through numerical convergence and stability analyses on benchmark examples with exact or noisy boundary data.
ENGINEERING WITH COMPUTERS
(2021)
Article
Mathematics, Applied
Zhiying Ma, Xinxiang Li, C. S. Chen
Summary: A new Kansa method with fictitious center approach is proposed in this paper, where the radial basis function (RBF) approximation is augmented by polynomial basis functions. The proposed approach significantly improves the accuracy and stability of the previously proposed ghost point method using radial basis functions, eliminating the difficulty of selecting a good RBF shape parameter. Two numerical examples are presented to demonstrate the effectiveness and improvement of the proposed method over previous methods.
APPLIED MATHEMATICS LETTERS
(2021)
Article
Mathematics, Applied
Jose Querales, Rodolfo Rodriguez, Pablo Venegas
Summary: This paper focuses on the numerical approximation of the displacement formulation of the acoustic eigenvalue problem in the axisymmetric case. It is shown that using lowest order triangular Raviart-Thomas elements may lead to spurious eigenvalues, but an alternative weak formulation is proposed to avoid this issue. A finite element discretization based on the same elements achieves quasi-optimal order spectral convergence and eliminates spurious modes, as supported by numerical experiments.
SIAM JOURNAL ON SCIENTIFIC COMPUTING
(2021)
Article
Engineering, Multidisciplinary
Jianghong Yu, Zhengbao Lei, Qishui Yao, Fenglin Zhou, Xianyun Pan
Summary: The paper proposes a bounded random shape variation scheme for the radial basis function interpolation to address the numerical stability issue, balancing accuracy and stability by bounding the shape variation. The developed scheme has been integrated into the dual reciprocity boundary element method for analyzing three-dimensional elastic problems, showing improved accuracy stably in numerical examples.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Article
Engineering, Marine
L. Najarzadeh, B. Movahedian, M. Azhari
Summary: In this paper, a modified radial integration boundary element method (MRIBEM) is used to solve the water wave propagation problem. The MRIBEM method is applied to solve the mild slope equation over arbitrary seabed geometries, dividing the infinite region into a central finite area and a semi-finite area. The interior part is solved using MRIBEM, while the exterior part is solved using the boundary element method. Numerical examples demonstrate the validity and efficiency of the proposed method, which combines the meshfree characteristic of MRIBEM and the fulfillment of Sommerfeld's radiation condition.
Article
Thermodynamics
Tiantian Zhang, Xiaoqing Yang
Summary: This paper develops a parametric level set-based topology optimization method for the design of micro-channel heat sinks, and its effectiveness is confirmed through numerical experiments and experimental tests.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Aerospace
Liang Xie, Zhicong Kang, Haifeng Hong, Zhihua Qiu, Biao Jiang
Summary: A new mesh deformation method, namely the dual-restricted RBF algorithm, is proposed in this study. This algorithm improves the efficiency of the mesh deformation process by introducing a constraint function for stationary wall preservation.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Multidisciplinary
Xiuyun Chen, Xiaomeng Yin, Kunpeng Li, Ruhui Cheng, Yanming Xu, Wei Zhang
Summary: This study couples isogeometric analysis (IGA) and boundary element methods (BEM) for solving three-dimensional steady heat conduction problems with variable coefficients. It utilizes Computer-Aided Design (CAD) for geometric construction and radial integration method for dealing with additional domain integrals caused by variable coefficients. Numerical examples are provided to demonstrate the correctness and advantages of the proposed algorithm in integrating CAD and numerical analysis.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2021)
Article
Engineering, Multidisciplinary
Hercules de Melo Barcelos, Carlos Friedrich Loeffler, Luciano de Oliveira Castro Lara
Summary: This study combines the direct interpolation boundary element method (DIBEM) and the domain superposition technique (DST) to solve piecewise inhomogeneous two-dimensional Helmholtz problems. The proposed methodology preserves the main features and advantages of the Boundary Element Method, and numerical evaluations are conducted through three different tests with benchmarks generated from Finite Element Method simulations.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2021)
Article
Engineering, Multidisciplinary
Rodrigo Guerra Peixoto, Lucas de Paulo de Souza
Summary: This paper presents a new cell-less boundary element method formulation for two-step thermoelastic analyses. The first step involves a steady-state thermal analysis, while the second step is a thermoelastic analysis using the temperature field obtained in the first step. Domain integrals involving internal heat sources and thermal strains are transformed to boundary integrals using the radial integration method. Meshfree techniques, such as the moving least square procedure and the radial point interpolation method, are adopted to calculate temperature during the evaluation of radial integrations in the second step. Representative examples are provided to illustrate the effectiveness of the proposed formulation. (c) 2022 Elsevier Inc. All rights reserved.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Gastroenterology & Hepatology
Cheng Kong, Lei Liang, Guang Liu, Lutao Du, Yongzhi Yang, Jianqiang Liu, Debing Shi, Xinxiang Li, Yanlei Ma
Summary: This study investigated the interactions between gut microbiome, metabolites, and microbial enzymes in early-onset colorectal cancer (EO-CRC) patients. The results showed distinct associations between microbiome and metabolome in EO-CRC compared to late-onset CRC (LO-CRC). The study identified potential biomarkers for EO-CRC and achieved a powerful classification performance for distinguishing EO-CRC from controls. This research provides valuable insights into the pathogenesis of EO-CRC and highlights the potential of microbiome-derived biomarkers for non-invasive detection.
Article
Engineering, Civil
Haoran Chen, Xuedong Yan, Xiaobing Liu, Tao Ma
Summary: With the rapid development of internet technologies and shared mobility services, online ridesharing services have become popular worldwide. This study compares the operational performance of two major online ridesharing modes, ridesplitting and carpooling, using actual operating data provided by DiDi Chuxing. The findings indicate that ridesplitting has lower fuel-saving and distance-saving ratios compared to carpooling, and online ridesharing is not considered fuel-saving in terms of transportation system's fuel economy.
Article
Information Science & Library Science
Pengzhen Yin, Chuang Wang, Liang Liang
Summary: This study examines the antecedents (i.e. characteristics of MICT) and outcomes (i.e. employee affective and cognitive well-being) of routine MICT use in the remote work context. The findings show that routine MICT use increases employee affective well-being, such as job satisfaction, and mitigates cognitive well-being issues, such as technology overload. The study also highlights the mediation effects of routine MICT use on the relationship between its characteristics and employee well-being.
INFORMATION TECHNOLOGY & PEOPLE
(2023)
Article
Chemistry, Physical
Zengqi Lu, Xiaolong Fu, Jiamao Li, Jingwei Hou, Guangming Ran, Chengjian Xiao, Xiaolin Wang
Summary: A hydrophobic microscopic reaction environment was constructed through the modification of mesoporous silica, which helped improve the catalytic activity of the LPCE reaction. The Pt@SBA-15-tetramethyldisilazane catalyst, prepared by modifying the SBA-15 carrier and loading metal Pt, exhibited a superhydrophobic structure with a water contact angle of 158 degrees. This structure enhanced the catalytic performance and prevented catalyst deactivation. Experimental results showed that the catalyst had good catalytic activity in tritium water and maintained high activity after 30 days.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Agriculture, Multidisciplinary
Yuxiang Gu, Haoran Chen, Xing Li, Dan Li, Yue Sun, Lin Yang, Ying Ma, Eric Chun Yong Chan
Summary: This study found that Lactobacillus paracasei IMC 502 can prevent and alleviate type 2 diabetes by mediating the gut microbiota-SCFA-hormone/inflammation pathway.
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
(2023)
Article
Automation & Control Systems
Huiming Li, Hao Chen, Xiangke Wang
Summary: This paper investigates the problem of collision-free leader-follower formation generation and tracking of multiple fixed-wing unmanned aerial vehicles (UAVs). A novel control law based on physicomimetics approach is proposed to integrate formation generation, formation tracking, and collision avoidance. The artificial forces driven by control laws imitating physical forces are used to achieve desired collaborative behaviors and obstacle avoidance naturally. Speed constraints are also considered and modified using a saturation function. Numerical simulations and experiments are provided to verify the effectiveness of the proposed control scheme.
ASIAN JOURNAL OF CONTROL
(2023)
Article
Engineering, Environmental
Long Liang, Chunmin Zhang, Shaolei Zhao, Baozhong Liu, Limin Wang, Fei Liang
Summary: Designing efficient catalysts is a crucial challenge for practical applications of high-capacity hydride in fuel-cell-based hydrogen economy. In this study, platinum-functionalized Ti3C2 material with an accordion-like structure, interlayer, and surface-dispersed nanoparticles was synthesized. The catalyst, Ti3C2@Pt, reduced the initial dehydrogenation temperature of high-density hydride AlH3 by 50% to 62 °C, comparable to commercial AlH3. Moreover, it exhibited high hydrogen supplying performance and retention ratio, achieving 9.3 wt% and 98% respectively, surpassing previously reported catalysts. The exceptional dehydrogenation performance of the material makes it a practical candidate for mobile device applications with the aid of high-efficiency catalysts.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Qiang Liu, Youjin Gong, Boyu Liu, Shunshun Xiong, Hui-Min Wen, Xiaolin Wang
Summary: In this study, an ultra-microporous alkyl Cu-based MOF-11 was developed for highly selective adsorption of xenon. The unique pore system of MOF-11 not only enables strong binding affinity with xenon, but also allows for dense packing of xenon molecules. MOF-11 demonstrates record-high xenon storage density, uptake, and selectivity, making it a promising candidate for xenon separation and capture.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Rheumatology
Haoran Chen, Huarui Liu, Wenting Lyu, Yin Liu, Mei Huang, Yingwei Zhang, Yuying Qiu, Yonglong Xiao, Hourong Cai, Jinghong Dai
Summary: This study retrospectively analyzed the clinical characteristics and risk factors of clinical recurrence in interstitial lung disease related to antisynthetase syndrome (ARS-ILD). Recurrence of ARS-ILD was common during medication intensity reduction, and age, lactate dehydrogenase (LDH), medication tapering duration, and discontinuation were identified as risk factors for recurrence.
CLINICAL RHEUMATOLOGY
(2023)
Article
Automation & Control Systems
Yuanmao Ye, Yongbin Zhang, Xiaolin Wang, Ka-Wai Eric Cheng
Summary: This article presents a new type of step-up multilevel inverter (MLI) using a front-side quasi-Z-source unit, which effectively limits the charging current variation and enhances the total voltage gain.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Yuanmao Ye, Minhao Chen, Xiaolin Wang, Lingling Cao
Summary: This article introduces a new boost-type common-ground photovoltaic (PV) inverter, which solves the problems of inrush charging current, input current quality, and boost capability by inserting a quasi-Z-source (qZS) unit into an SC-based common-ground inverter, and is experimentally verified.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Jianqiang Luo, Fei Teng, Siqi Bu, Zhongda Chu, Ning Tong, Anbo Meng, Ling Yang, Xiaolin Wang
Summary: This paper proposes a solution to address the traditional operational constraint issue in power systems considering converter-driven stability and elaborates on a power sensitivity-based power dispatch method to enhance stability margin and update operational constraint solutions.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Review
Chemistry, Multidisciplinary
Hui-Ying Tan, Jiali Wang, Sheng-Chih Lin, Tsung-Rong Kuo, Hao Ming Chen
Summary: Single-atom catalysts (SACs) are promising electrocatalysts for energy conversion and storage due to their efficient atom utilization and unique electronic properties. The local coordination structures of single metal centers play a significant role in catalytic performances, and understanding the dynamic changes of SACs during reactions is crucial for improving catalytic activity.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Gastroenterology & Hepatology
Xiaoduan Zhuang, Shaoheng Zhang, Guiquan Chen, Zongqi Luo, Huiqin Hu, Wenfeng Huang, Yu Guo, Yongwen Ouyang, Liang Peng, Qing Qing, Huiting Chen, Bingsheng Li, Jie Chen, Xinying Wang
Summary: This study aimed to explore the unsatisfactory histologically complete resection (CR) rate of small rectal neuroendocrine tumors (RNETs) and its associated risk factors and clinical outcomes. The study found that polypectomy, a central depression, and treatment in the early period were risk factors for incomplete resection (IR). Further analysis revealed that an atypical hyperemic appearance and treatment in the early period were significant predisposing factors for inappropriate choice of polypectomy.
GASTROENTEROLOGY REPORT
(2023)
Article
Automation & Control Systems
Zhongjing Yu, Gangyi Zhang, Jingyu Chen, Haoran Chen, Duo Zhang, Qinli Yang, Junming Shao
Summary: This paper proposes a noise-resistant graph embedding method, called NGE, which leverages subspace clustering information to capture community structure and reinforce the relationship between topology and attributes. Experimental results demonstrate the superiority of this method in tasks such as community detection, link prediction, and node classification.
IEEE TRANSACTIONS ON CYBERNETICS
(2023)
Article
Engineering, Multidisciplinary
Dongliang Ji, Hui Cheng, Hongbao Zhao
Summary: The influence of crystal size on the macroscopic parameters of sandstone samples is studied using a rock model based on the Voronoi tessellated model. It is found that decreasing crystal size results in increased strength and elastic modulus. Strain energy density (SED) is shown to help explain the failure mechanisms of the sandstone samples. A constitutive model that considers the heterogeneity in elastic modulus and rock strength is developed and is in good agreement with experimental results. The study also identifies the triggering of surface damage on slopes by vibration excitation in engineering applications as well as proposes a constitutive model for quantitatively evaluating damage accumulation in mining tunnels.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2024)
Article
Engineering, Multidisciplinary
Francesco Tornabene, Matteo Viscoti, Rossana Dimitri
Summary: This manuscript investigates the dynamic properties of doubly-curved shell structures laminated with innovative materials using the Generalized Differential Quadrature (GDQ) method. The displacement field variable follows the Equivalent Single Layer (ESL) approach, and the geometrical description of the structures is distorted by generalized isogeometric blending functions. Through non-uniform discrete computational grid, the fundamental equations derived from the Hamiltonian principle are solved in strong form. Parametric investigations show the influence of material property variation on the modal response of the structures.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2024)
Article
Engineering, Multidisciplinary
Duy-Khuong Ly, Ho-Nam Vu, Chanachai Thongchom, Nguyen-Thoi Trung
Summary: This paper presents a novel numerical approach for nonlinear analysis and smart damping control in laminated functionally graded carbon nanotube reinforced magneto-electro-elastic (FG-CNTMEE) plate structures, taking into account multiple physical fields. The approach employs a multi-physical coupling isogeometric formulation to accurately capture the nonlinear strain-displacement relationship and the magneto-electro-elastic coupling properties. The smart constrained layer damping treatment is applied to achieve nonlinear damped responses. The formulation is transformed into the Laplace domain and converted back to the time domain through inverse techniques for smart control using viscoelastic materials.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2024)
Article
Engineering, Multidisciplinary
Xiaoyang Xu, Jie Cheng, Sai Peng, Peng Yu
Summary: In this study, a smoothed particle hydrodynamics (SPH) method is developed to simulate viscoelastic fluid flows governed by the Phan-Thien-Tanner (PTT) constitutive equation. The method is validated by comparing its solutions with those obtained by the finite volume method (FVM). The method is also used to simulate the impact behavior and dynamics of a viscoelastic droplet, and the influences of various parameters are investigated. The results demonstrate the accuracy and capability of the SPH method in describing the rheological properties and surface variation characteristics of viscoelastic fluid flows.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2024)
Article
Engineering, Multidisciplinary
Xueying Zhang, Yangjiong Wu
Summary: This paper proposes a high resolution strategy for the localized method of approximate particular solutions (LMAPS). The strategy aims to improve the accuracy and stability of numerical calculation by selecting upwind interpolation templates. Numerical results demonstrate that the proposed high-resolution LMAPS is effective and accurate, especially for solving the Navier-Stokes equations with high Reynolds number.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2024)
Article
Engineering, Multidisciplinary
Yong-Tong Zheng, Yijun Liu, Xiao-Wei Gao, Yang Yang, Hai-Feng Peng
Summary: Structures with holes are common in engineering applications. Analyzing stress concentration effects caused by holes using FEM or BEM is challenging and time-consuming. This paper proposes improved methods for simulating holes and cylinders, reducing the number of nodes while maintaining stress accuracy. Numerical examples demonstrate the accuracy and efficiency of the proposed methods.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2024)
Article
Engineering, Multidisciplinary
Chein-Shan Liu, Chung-Lun Kuo
Summary: The paper presents two new families of fundamental solutions for the 3D Laplace equation and proposes the methods of pseudo fundamental solutions and anisotropic fundamental solutions, which outperform the traditional 3D MFS.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2024)
Article
Engineering, Multidisciplinary
Sima Shabani, Miroslaw Majkut, Slawomir Dykas, Krystian Smolka, Esmail Lakzian
Summary: This study validates and simulates steam condensing flows using different condensation models and equations of state, identifying the most suitable model. The results highlight the importance of choosing the appropriate numerical model for accurately predicting steam condensation flows.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2024)
Article
Engineering, Multidisciplinary
D. L. Guo, H. H. Zhang, X. L. Ji, S. Y. Han
Summary: In this study, the mechanical behaviors of 2-D orthotropic composites with arbitrary holes were investigated using the numerical manifold method (NMM). The proposed method was verified and found to have good convergence and accuracy. Additionally, the effects of material principal direction and hole configurations on the mechanical behaviors of the orthotropic composites were revealed.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2024)
Article
Engineering, Multidisciplinary
Giacomo Rosilho de Souza, Rolf Krause, Simone Pezzuto
Summary: In this paper, we propose a boundary element method for accurately solving the cell-by-cell bidomain model of electrophysiology. The method removes the degeneracy in the system and reduces the number of degrees of freedom. Numerical experiments demonstrate the exponential convergence of our scheme in space and several biologically relevant experiments are provided.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2024)
Article
Engineering, Multidisciplinary
Riku Toshimitsu, Hiroshi Isakari
Summary: This study extends a recent paper by Lai et al. (2018) by introducing a novel boundary integral formulation for scalar wave scattering analysis in two-dimensional layered and half-spaces. The modified integral formulation eliminates fictitious eigenvalues and reasonable parameter settings ensure efficient and accurate numerical solutions. The proposed method is demonstrated to be effective through numerical examples.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2024)
Article
Engineering, Multidisciplinary
Ebutalib Celik, Merve Gurbuz-Caldag
Summary: In this paper, a new meshless method based on domain decomposition for an L-shaped domain is proposed, which uses RBF-FD formulation at interface points and classical FD in sub-regions to improve the solution accuracy. The proposed numerical method is applied to simulate benchmark results for a divided-lid driven cavity and solve Navier-Stokes equations with Lorentz force term in a single-lid L-shaped cavity exposed to inclined magnetic field, and the flow structure is analyzed in terms of streamline topology under different magnetic field rotations and strengths.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2024)
Article
Engineering, Multidisciplinary
Hanqing Liu, Fajie Wang, Lin Qiu, Cheng Chi
Summary: This paper presents a novel method that combines the singular boundary method with the Loop subdivision surfaces for acoustic simulation of complex structures, overcoming technical challenges in handling boundary nodes.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2024)
