Article
Mathematics, Applied
Darko Volkov, Yulong Jiang
Summary: This paper presents a Lipschitz stability result for a crack inverse problem in half space, focusing on the unknown geometry and location of the crack. By assuming certain conditions on the geometry, it is shown that the inverse problem is uniquely solvable, highlighting the stability of reconstructing the crack plane despite the unknown forcing term.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2021)
Article
Thermodynamics
Yiming Wang, Zhaoxiang Chu, Xiaozhao Li, Peng Zhao, Yukun Ji
Summary: This study presents a detailed and primordial derivative process of the classical Maxwell problem applied to thermal conductivity. It aims to provide a foundation for further research on various correlations predicting the effective thermal conductivity of porous-composite media. The process solves the Laplace's Equation for temperature distribution in a spherical coordinate, overcoming shortcomings in previous literature in this field.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Jianting Zhu
Summary: In this study, a new three-cell two-phase model is developed to calculate the thermal conductivity of porous media. The model accurately predicts the thermal conductivity under different conditions and reflects the extent of solid-liquid phase contact.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Mathematics, Applied
Ismet Golgeleyen
Summary: This article investigates the uniqueness of solution of an inverse source problem for a generalized kinetic equation on a Riemannian manifold, proving the uniqueness in a convex domain with the help of Riemannian coordinates.
JOURNAL OF GEOMETRY AND PHYSICS
(2021)
Article
Thermodynamics
Hans Janssen
Summary: This critique highlights conceptual and practical flaws in Zhu's thermal conductivity model, which may lead to results beyond theoretical limits and perform poorly in dry porous media.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Mathematics, Applied
Durdimurod K. Durdiev, Askar A. Rahmonov, Zavqiddin R. Bozorov
Summary: This paper considers a two-dimensional inverse problem for a fractional diffusion equation, reducing it to an equivalent integral equation and solving it using the contracted mapping principle. Local existence and global uniqueness results are proven, along with obtaining a stability estimate.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2021)
Article
Engineering, Multidisciplinary
Dariusz Lydzba, Adrian Rozanski, Igor Sevostianov, Damian Stefaniuk
Summary: A new methodology for evaluating the thermal/electrical properties of the skeleton of a porous material is proposed and validated numerically, based on the concept of equivalent microstructure and solving the inverse homogenization problem in the framework of the Mori-Tanaka-Benveniste micromechanical model.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2021)
Article
Engineering, Chemical
Tao Liu, Kaiwen Xia, Yuanjin Zheng, Yanxiong Yang, Ruofeng Qiu, Yunfei Qi, Chao Liu
Summary: This paper investigates the constrained inverse problem based on the nonlinear convection-diffusion equation in multiphase porous media flow, introducing a widely convergent homotopy method to solve it. Two numerical examples demonstrate the method's wide convergence region and strong anti-noise ability.
Article
Engineering, Multidisciplinary
Simiao Chen, Qiang He, Chensheng Zheng, Lihong Sun, Xingwei Wang, Lianbo Ma, Yuliang Cai
Summary: This paper proposes a vaccination optimization problem with the lowest total cost based on the SIR model and presents a practical method combining differential evolution and simulated annealing to solve the problem. Experimental results on six datasets demonstrate that the proposed method achieves a lower cost vaccination strategy compared to baseline algorithms.
IEEE TRANSACTIONS ON NETWORK SCIENCE AND ENGINEERING
(2022)
Article
Mathematics, Applied
Kamal Rashedi
Summary: This study investigates the inverse problem of identifying the diffusion coefficient in the one-dimensional parabolic heat equation, reformulating the problem as a nonclassical parabolic equation and solving it using a system of nonlinear algebraic equations. Numerical simulations are used to demonstrate the feasibility of the proposed method.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2021)
Article
Mathematics, Applied
Zineb Bouslah, Abdelhak Hadj, Hacene Saker
Summary: This paper addresses the Robin inverse problem for the biharmonic equation in a 2D simply connected domain. It proposes a method based on nonlinear boundary integral equation to reconstruct the shape of the boundary. By applying the Newton iterative technique and Frechet derivatives, the system can be linearized and the injectivity of the linearized system is established. Numerical examples are provided to illustrate the feasibility of the method.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Energy & Fuels
Xuan Qin, Wanjun Yin
Summary: A novel theoretical model for calculating effective thermal conductivity in porous media is proposed in this study. The model takes into account the distribution characteristics of particle size and shows good agreement with existing models and experimental data. This model is of great significance for studying thermophysical mechanisms in granular porous media.
Article
Engineering, Geological
Zhaoxiang Chu
Summary: A fixed-parameter ETC predictive model is proposed in this study using simple combinatory rules, which unifies the triweighted means of tri-upper and lower ETC bounds. Theoretical analyses explain the success of the weighted arithmetic combination and experimental validation shows that the presented combinatory models fit well with most ETC data of internal porosity geomaterials. However, these models give more uncertainty when applied to external porosity geomaterials such as granular sands. Meaningful analyses, conclusions, and research perspectives are obtained and provided for further investigations.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Mathematics, Applied
Abdelhak Hadj, Hacene Saker
Summary: This study focuses on recovering Robin coefficients on a non-accessible part of the boundary in a planar domain from measured data using Tikhonov regularization method. The feasibility of this approach is demonstrated through numerical reconstructions of the missing Cauchy data on the known boundary curve.
APPLIED NUMERICAL MATHEMATICS
(2021)
Article
Engineering, Multidisciplinary
Adrian Rozanski, Jakub Rainer, Damian Stefaniuk, Igor Sevostianov, Dariusz Lydzba
Summary: This paper formulates a procedure to reconstruct the microstructure that produces the same effective thermal conductivity as the real composite material, and finds a binary representation of the "replacement" microstructure. The efficiency of this methodology has been illustrated and it can be used in computational modeling and 3D printing applications.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Engineering, Civil
Maciej Sobotka, Dariusz Lydzba
Summary: The article focuses on the numerical modeling of a soil-steel structure under live loads. The study validates the hysteresis effect of live load using measurements obtained from a real culvert in Poland. The finite volume method and Mohr-Coulomb model are used to simulate the live load test and soil-steel interface, resulting in a fair agreement between simulation and measurement results in both quantitative and qualitative aspects.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2022)
Article
Engineering, Civil
Adrian Rozanski, Anna Rozanska, Maciej Sobotka, Michal Pachnicz, Miroslawa Bukowska
Summary: Material properties depend on structure and can change significantly as structure evolves. Laboratory techniques can be used to evaluate material structure under different temperatures and analyze the impact on mechanical parameters.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Review
Energy & Fuels
Krzysztof Majcher, Michal Musia, Wojciech Pakos, Adrian Rozanski, Maciej Sobotka, Tomasz Trapko
Summary: Protection against high power microwave (HPM) pulses can be achieved by using radiation-absorbent materials or artificial electromagnetic structures. There is potential in utilizing HPM energy absorbers in building products and structures to protect them from the impact of HPM pulses.
Article
Green & Sustainable Science & Technology
Kamil Krzywinski, Lukasz Sadowski, Damian Stefaniuk, Aleksei Obrosov, Sabine Weiss
Summary: This study demonstrated the feasibility and advantages of using recycled fine aggregate in the preparation of epoxy resin coatings through analyzing the microstructural and macroscopic mechanical properties of the modified coatings.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2022)
Article
Engineering, Geological
Adrian Rozanski
Summary: This study introduces the concept of local thermal conductivity fluctuation in the soil skeleton, explores its relation to soil texture and grain size distribution, and provides valuable numerical simulation results for practical applications.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Construction & Building Technology
Damian Stefaniuk, Maciej Sobotka, Kamila Jarczewska, Dominik Logon, Krzysztof Majcher, Michal Musial, Pawel Niewiadomski, Wojciech Pakos, Adrian Rozanski, Tomasz Trapko
Summary: In this paper, various additives used for electromagnetic (EM) waves absorbing applications were investigated as fillers in cementitious mortars. The effects of these additives on the micro-structure of the mortar were analyzed using X-ray micro-computed tomography, scanning electron microscopy (SEM), and nanoindentation techniques. The study focused on the changes in calcium-to-silicon ratio and pore morphology, and their relationship with the EM absorption performance and compressive strength of the mortar at the macroscale.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Engineering, Multidisciplinary
Adrian Rozanski, Jakub Rainer, Damian Stefaniuk, Igor Sevostianov, Dariusz Lydzba
Summary: This paper formulates a procedure to reconstruct the microstructure that produces the same effective thermal conductivity as the real composite material, and finds a binary representation of the "replacement" microstructure. The efficiency of this methodology has been illustrated and it can be used in computational modeling and 3D printing applications.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Materials Science, Characterization & Testing
Aleksandra Ujcic, Maciej Sobotka, Miroslav Slouf, Adrian Rozanski, Konrad Szustakiewicz
Summary: This study focuses on the characterization of porous PCL scaffolds prepared by TIPS and TIPS-PL combined with freeze-drying. The effects of PCL grade and sodium chloride particles on the crystallization behavior, thermal properties, and structural changes of the scaffolds were investigated. The addition of sodium chloride particles significantly affected the pore size, density, compressive properties, porosity, and water uptake of the scaffolds.
Article
Energy & Fuels
Michal Musial, Dominik Logon, Krzysztof Majcher, Pawel Niewiadomski, Tomasz Trapko, Kamila Jarczewska, Wojciech Pakos, Adrian Rozanski, Maciej Sobotka, Damian Stefaniuk
Summary: The aim of this research was to select an absorbing admixture to improve the effectiveness of shielding against electromagnetic waves, while also meeting construction engineering requirements. The best improvement in mechanical properties was achieved with steel fibers, carbon black P803, ferrite, and fly ash. The best shielding effectiveness was obtained with graphite flakes, graphite powder, carbon black N990 and P803, polypropylene and steel fibers, and hybrid admixtures.
Article
Engineering, Multidisciplinary
Damian Stefaniuk, Mark Kachanov
Summary: The Voight-Reuss-Hill (VRH) bounds can be extended to cases of anisotropy, but they are too wide for large property contrast. On the other hand, the Hashin-Shtrikman (HS) bounds are narrower but more complex and do not easily apply to anisotropic cases without additional microstructure information. This study shows that the VRH mid-line estimates are accurate within the HS bounds in a broad range of property contrast, and they can be readily extended to anisotropic cases.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Multidisciplinary Sciences
Nicolas Chanut, Damian Stefaniuk, James C. Weaver, Yunguang Zhu, Yang Shao-Horn, Admir Masic, Franz-Josef Ulm
Summary: This article investigates a scalable energy storage solution using readily available materials for constructing supercapacitors. By analyzing the microscopic structure and energy storage capacity of carbon-cement electrodes, the researchers demonstrate the potential of these carbon-cement supercapacitors for sustainable residential and industrial applications.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Multidisciplinary Sciences
Damian Stefaniuk, Marcin Hajduczek, James C. Weaver, Franz J. Ulm, Admir Masic
Summary: Bridging the gap between greenhouse gas emissions from ordinary Portland cement production and the carbon neutrality goal by 2050 is a significant challenge. Directly sequestering and storing anthropogenic CO2 in concrete through forced carbonate mineralization is a potential option. Research has shown that early stage out-of-equilibrium carbonation reactions do not compromise the structural integrity of the material and allow for significant CO2 incorporation, reducing the environmental footprint of cement materials.
Article
Mechanics
Dariusz Lydzba, Adrian Rozanski, Maciej Sobotka, Michal Pachnicz, Szczepan Grosel, Matylda Tankiewicz, Pawel Stefanek
Summary: This study focuses on the qualitative safety analysis of the Zelazny Most tailings pond, investigating the effectiveness of preventive measures such as relief wells and loading berms. The research suggests that these measures have a positive impact on improving the safety level of the structure, especially when applied simultaneously. It is recommended that final solutions for the facility should be based on quantitative 3D analysis.
STUDIA GEOTECHNICA ET MECHANICA
(2021)
Article
Engineering, Multidisciplinary
Tohya Kanahama, Motohiro Sato
Summary: This study theoretically explains the effect of initial deflection and initial slope on self-buckling characteristics of heavy columns and proposes a formula characterizing the self-buckling problem. The results show that the greatest height is proportional to the 2/3 power of radius, and the formula can potentially predict the height of tree-like natural structures.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Aps Selvadurai, Alexander P. Suvorov
Summary: This paper examines the torsion of a solid cylinder made of a fluid-saturated porous medium with a hyperelastic porous skeleton. It analyzes the mechanics of the twisted cylinder in both short-term and long-term behaviors, using numerical solutions and the ABAQUSTM finite element code.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
S. Kanaun
Summary: This study focuses on spherical radially transverse isotropic heterogeneous inclusions in homogeneous isotropic conductive host media. The volume integral equation for the field in the medium with an isolated inclusion subjected to a constant external field is solved using Mellin-transform technique. The method allows revealing tensor structure of the solution with precision to one scalar function of radial coordinate. The study also investigates the influence of neutral inclusions and conductivity coefficients on the effective conductivity of the composite material.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Marinos Kattis, Vassilis Tsitsos, Vassilis Karatzaferis
Summary: The proposed model utilizes continuum mechanics to describe the mechanical behavior of a weakened interface between materials with microstructure, simulating the weakened interface using a surface elastic medium adhering on either side with bulk elastic continua. The model is able to investigate the effect of a weakened interface on stress concentration around inhomogeneities embedded in an unbounded matrix of Cosserat materials.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Shixiang Zhao, Yu. V. Petrov, Yuyi Zhang, G. A. Volkov, Zejian Xu, Fenglei Huang
Summary: This paper theoretically studies the thermal softening related to stress relaxation using the incubation time approach and examines the temperature-time correspondence. The developed relaxation model of plasticity (RP model) is analyzed and compared with other constitutive models and artificial neural networks. The advantages and disadvantages of different models are discussed, and the differences between the ANN model and other constitutive models are examined.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Ivan I. Argatov, Federico J. Sabina
Summary: This study models a seismic metabarrier as a cluster of single-degree-of-freedom resonator units and considers the scattering effects on pulsed Rayleigh waves caused by the vertical displacements of the resonators and the normal contact forces. The variation of the amplitude reduction factor due to the model parameters variation is studied in detail.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)