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Impacts of anisotropy coefficient and porosity on the thermal conductivity and P-wave velocity of calcarenites used as building materials of historical monuments in Morocco

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第7期15卷 1687-1699页

作者： Abdelaali Rahmouni Abderrahim Boulanouar Younes El Rhaffari Mohammed Hraita Aziz Zaroual Yves Géraud Jamal Sebbani abdellah rezzouk Bassem S.Nabawy Laboratory of Solid State Physics Department of PhysicsFaculty of Science Dhar El MahrazSidi Mohamed Ben Abdellah UniversityFezMorocco Laboratory of Applied Sciences National School of Applied SciencesAbdelmalek Essaadi UniversityAl HoceimaMorocco Laboratory of Civil Engineering and Environment Higher School of Technology of SaléMohammed V UniversityRabatMorocco Department of Physics Higher Normal SchoolMohammed V UniversityRabatMorocco Laboratory of Materials Nanotechnologies and EnvironmentFaculty of ScienceMohammed V UniversityRabatMorocco University of Lorraine ENSGUMR 7359-GeoRessourcesNancyFrance Mechanics and Materials Team Faculty of ScienceMohammed V UniversityRabatMorocco Geophysical Sciences Department National Research CentreCairoEgypt

It is essential to study the porosity,thermal conductivity,and P-wave velocity of calcarenites,as well as the anisotropy coefficients of the thermal conductivity and P-wave velocity,for civil engineering,and conservation and restoration of historical monuments.This study focuses on measuring the thermal conductivity using the thermal conductivity scanning(TCS)technique and measuring the P-wave ve-locity using portable equipment.This was applied for some dry and saturated calcarenite samples in the horizontal and vertical directions(parallel and perpendicular to the bedding plane,respectively).The calcarenites were selected from some historical monuments in Morocco.These physical properties were measured in the laboratory to find a reliable relationship between all of these properties.As a result of the statistical analysis of the obtained data,excellent linear relationships were observed between the porosity and both the thermal conductivity and porosity.These relationships are characterized by relatively high coefficients of determination for the horizontal and vertical samples.Based on the thermal conductivity and P-wave velocity values in these two directions,the anisotropy coefficients of these two properties were calculated.The internal structure and the pore fabric of the calcarenite samples were delineated using scanning electron microscopy(SEM),while their chemical and mineral compositions were studied using the energy dispersive X-ray analysis(EDXA)and X-ray diffraction(XRD)techniques.

关键词： Moroccan historical monuments Calcarenite Thermal conductivity P-wave velocity Porosity Anisotropy coefficient Water saturation

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On the Regularity and Chaos of the Hydrogen Atom Subjected to External Fields

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International Journal of Modern Nonlinear Theory and Application 2018年第2期7卷 56-76页

作者： Jaouad Kharbach Walid Chatar Mohamed Benkhali abdellah rezzouk Mohammed Ouazzani-Jamil Laboratoire de Physique du Solide Faculté des Sciences Dhar El Mahraz Université Sidi Mohamed Ben Abdellah Fès-Atlas Morocco Université Privée de Fès Laboratoire Systèmes et Environnements Durables Lot. Quaraouiyine Route Ain Chkef Fès Mo-rocco

In this paper, the integrable classical case of the Hydrogen atom subjected to three static external fields is investigated. The structuring and evolution of the real phase space are explored. The bifurcation diagram is found and the bifurcations of solutions are discussed. The periodic solutions and their associated periods for singular common-level sets of the first integrals of motion are explicitly described. Numerical investigations are performed for the integrable case by means of Poincaré surfaces of section and comparing them with nearby living nonintegrable solutions, all generic bifurcations that change the structure of the phase space are illustrated;the problem can exhibit regularity-chaos transition over a range of control parameters of system.

关键词： Hydrogen Atom Zeeman Effect Stark Effect Van Der Waals Interaction Hamiltonian System Integrability Bifurcation Chaos Poincaré Surfaces of Section

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The Study on the Phase Structure of the Paul Trap System

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Applied Mathematics 2017年第4期8卷 525-536页

作者： Jaouad Kharbach Mohamed Benkhali Mohamed Benmalek Ahmed Sali abdellah rezzouk Mohammed Ouazzani-Jamil Laboratoire de Physique du Solide Faculté des Sciences Dhar El Mahraz Université Sidi Mohamed Ben Abdellah Fès-Atlas Morocco Université Privée de Fès Laboratoire Systèmes et Environnements Durables Lot. Quaraouiyine Route Ain Chkef Fès Morocco

In this article, the classic dynamic of Paul trap problem is investigated. We give a complete description of the topological structure of Hamiltonian flows on the real phase space. Using the surgery’s theory of Fomenko Liouville tori, all generic bifurcations of the common level sets of the first integrals were described theoretically. We give also an explicit periodic solution for singular values of the first integrals. Numerical investigations are carried out for all generic bifurcations and we observe order-chaos transition when the critical value of a control parameter is varied.

关键词： Hamiltonian System Integrability Bifurcation Liouville Tori Periodic Solutions Poincaré Section Chaos

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First-principles calculations to investigate structural,electronic,magnetic,optical and thermodynamic properties of RE2Rh3Ge（RE=Pr,Sm）

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Journal of Rare Earths 2024年第7期42卷 1385-1393页

作者： A.Ezaier R.Masrour M.Hamedoun J.Kharbach A.rezzouk A.Hourmatallah N.Benzakour K.Bouslykhane Laboratory of Solid Physics Faculty of Sciences Dhar El MehrazSidi Mohamed Ben Abdellah University Equipe de Physique du Solide LaboratoiresLIPIEcole Normale Supérieure

In this paper,we analyzed the physical characteristics of the ternary alloys RE2Rh3Ge（RE=Pr and Sm）using the first principles calculation based on functional density theory integrated in the Wien2k code.The calculated formation energies of Pr2Rh3Ge and Sm2Rh3Ge are-5.3827 and-5.2782 eV/atom,respectively,showing that these alloys may exist stably.The results of the band structure and density of states indicate that all of the compounds tested are magnetic metals,and their magnetism is mostly related to the contribution of Pr and Sm atoms.The total magnetic moments of Pr2Rh3Ge and Sm2Rh3Ge are 4.07245 and 11.16161 μB/f.u,respectively.Thermodynamic parameters such as heat capacity at constant pressure,entropy,Debye temperature,lattice volume,compressibility coefficients,and Griineisen parameter alloys were calculated using the Gibbs algorithm and studied in depth over a large temperature range of 0-900 K.The Debye temperature increases with increasing pressure and decreases with decreasing temperature.Moreover,the Debye temperatures calculated at p=0 GPa and T=300 K are equal to be 342 and 322 K for Pr2Rh3Ge and Sm2Rh3Ge,respectively.The optical characteristics such as the real and imaginary portions of the dielectric function,the absorption coefficient,the energy-loss function,and the refractive index were investigated and discussed in more depth.

关键词： Density of states Functional density theory Magnetic metals Magnetic moment Optical and thermodynamic properties Rare earths

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Intrinsic ferromagnetism in CoBr2 nanolayers:a DFT+U and Monte Carlo study

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Communications in Theoretical Physics 2021年第11期73卷 165-170页

作者： A Jabar R Masrour G Kadim M Hamedoun A Hourmatallah N Benzakour A rezzouk K Bouslykhane J Kharbach Laboratory of Solid Physics Faculty of Sciences Dhar El MahrazSidi Mohamed Ben Abdellah UniversityBP 1796FezMorocco MAScIR Institute of Nanomaterials and NanotechnologiesRabatMorocco Equipe de Physique du Solide Laboratoire LIPIEcole Normale SupérieureBensoudaBP 5206FèsMorocco

The intrinsic ferromagnetism of CoBr2 bulk was investigated using DFT(density functional theory)combined with the full potential linear augmented plane wave method and Monte Carlo simulations.The ground state of CoBr2 exhibits ferromagnetic behavior and a semiconductor character.We used the generalized gradient approximation(GGA)and GGA+U(Hubbard correction)approximations to determinate the magnetic moment.The magnetic moment reached the experimental value and was in good agreement with the other theoretical values.The value obtained was used as an input to a Monte Carlo study to calculate the thermal magnetization and magnetic hysteresis cycles.Ferromagnetic behavior was observed and was found to be due to an positive exchange interaction.These results lead us to believe that this material could be a promising spintronic material.

关键词： CoBr2 nanolayer DFT Monte Carlo transition temperature magnetic hysteresis cycles

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Spin and Orbital Magnetisms of NiFe Compound:Density Functional Theory Study and Monte Carlo Simulation

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Chinese Physics Letters 2018年第3期35卷 58-61页

作者： R.Masrour A.Jabar E.K.Hlil M.Hamedoun A.Benyoussef A.Hourmatallah K.Bouslykhane A.rezzouk N.Benzakour Laboratory of Materials ProcessesEnvironment and QualityCady Ayyed UniversityNational School of Applied SciencesSail 63 46000Morocco Institut Neel CNRS et Universite Grenoble AlpesBP 166F-38042 Grenoble Cedex 9France Institute of Nanomaterials and Nanotechnologies MAScIRRabatMorocco Hassan II Academy of Science and Technology RabatMorocco Equipe de Physique du Solide Laboratoire LIPIEcole Normale SuperieureBP 5206BensoudaFesMorocco Laboratoire de Physique du Solide Universite Sidi Mohammed Ben AbdellahFaculte des Sciences Dhar MahrazBP 1796FesMorocco

The self-consistent ab initio calculations based on the density functional theory approach using the full potential linear augmented plane wave method are performed to investigate both the electronic and magnetic properties of the NiFe compound. Polarized spin within the framework of the ferromagnetic state between magnetic ions is considered. Also, magnetic moments considered to lie along （001） axes are computed. The Monte Carlo simulation is used to study the magnetic properties of NiFe. The transition temperature To, hysteresis loop, coercive field and remanent magnetization of the NiFe compound are obtained using the Monte Carlo simulation.

关键词： Fe Spin and Orbital Magnetisms of Ni Fe Compound Ni

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