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THe eFFeCT OF DUAL-PHAse-LAG MODeL ON ReFLeCTION OF THeRMOeLAsTIC WAVes IN A sOLID HALF sPACe WITH VARIABLe MATeRIAL PROPeRTIes

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Acta Mechanica solida sinica 2013年第6期26卷 659-670页

作者： A.M.Zenkour D.s.Mashat A.e.Abouelregal Department of Mathematics Faculty of ScienceKing Abdulaziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia Department of Mathematics Faculty of ScienceKafrelsheikh UniversityKafr El-Sheikh 33516Egypt Department of Mathematics Faculty of ScienceMansoura UniversityMansoura 35516Egypt Department of Mathematics College of Science and ArtsUniversity of AljoufEl-QurayatSaudi Arabia

The present article represents an analysis of reflection of P-wave and sV-wave on the boundary of an isotropic and homogeneous generalized thermoelastic half-space when the boundary is stress-free as well as isothermal. The modulus of elasticity is taken as a linear function of reference temperature. The basic governing equations are applied under four theories of the generalized thermoelasticity： Lord-shulman （L-s） theory with one relaxation time, Green-Naghdi （G-N） theory without energy dissipation and Tzou theory with dual-phase-lag （DPL）, as well as the coupled thermoelasticity （CTe） theory. It is shown that there exist three plane waves, namely, a thermal wave, a P-wave and an sV-wave. The reflection from an isothermal stress-free surface is studied to obtain the reflection amplitude ratios of the reflected waves for the incidence of P- and sV-waves. The amplitude ratios variations with the angle of incident are shown graphically. Also the effects of reference temperature of the modulus of elasticity and dual-phase lags on the reflection amplitude ratios are discussed numerically.

关键词： generalized thermoelasticity dual-phase-lag variable material properties reflection waves

Cellular automata modelling of grain coarsening during reheating——Ⅱ. Abnormal grain growth

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Journal of University of science and Technology Beijing 2005年第1期12卷 26-32页

作者： WanhuaYu e.J.Palmiere s.P.Banks JingtaoHan DepartmentofMaterialsengineering UniversityofScienceandTechnologyBeijingBeijing100083China DepartmentofengineeringMaterials UniversityofSheffieldS13JDSheffieldUK DepartmentofAutomaticControlandsystemsengineering UniversityofSheffieldS13JDSheffieldUK

The 2-dimensional cellular automata (CA) simulation technique has been utilized to investigate the abnormal grain coarsening. The growth of abnormal grains is modelled under this assumption that different grains have different boundary energies and boundary mobilities. As temperature increases, some grains may first get rid of the particle pinning effect. Thus a high probability is obtained for atoms to jump over the boundary, so that they can consume other primary retained grains quickly. From the simulation, the characteristics of the abnormal grain coarsening under different conditions are demonstrated successfully. An experiment has also been carried out to reflect the abnormal grain coarsening on the microalloy steel. simulation results are quite close to the experimental evidence.

关键词： computer simulation grain growth microstructure reheating

Numerical forecasting surge in a piping of compressor shops of gas pipeline network

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Journal of Zhejiang University-science A(Applied Physics & engineering) 2007年第11期8卷 1775-1788页

作者： seLeZNeV V. e. PRYALOV s. N. Physical & Technical Center Joint Stock Company Sarov 607180 Russia

This paper presents a method of forecasting stable operation of gas compressor unit (GCU) centrifugal supercharger (CFs) installed on a piping of compressor shops servicing gas pipelines. The stability of superchargers operation is assessed in relation to the phenomenon of surge. solution of this problem amounts to the development and numerical analysis of a set of ordinary differential equations. The set describes transmission of gas through a compressor shop as a fluid dynamics model with lumped parameters. The proposed method is oriented to wide application by specialists working in the gas industry. The practical application of this method can use all-purpose programming and mathematical software available to specialists of gas companies.

关键词： Gas pipelines Compressor station Centrifugal supercharger (CFs) surge Numerical simulation

Prediction of operational parameters effect on coal flotation using artificial neural network

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Journal of University of science and Technology Beijing 2008年第5期15卷 528-533页

作者： e. Jorjani sh. Mesroghli s. Chehreh Chelgani Department of Mining engineering Science and Research BranchIslamic Azad University

Artificial neural network procedures were used to predict the combustible value （i.e. 100-Ash） and combustible recovery of coal flotation concentrate in different operational conditions. The pulp density,pH,rotation rate,coal particle size,dosage of collector,frother and conditioner were used as inputs to the network. Feed-forward artificial neural networks with 5-30-2-1 and 7-10-3-1 arrangements were capable to estimate the combustible value and combustible recovery of coal flotation concentrate respectively as the outputs. Quite satisfactory correlations of 1 and 0.91 in training and testing stages for combustible value and of 1 and 0.95 in training and testing stages for combustible recovery prediction were achieved. The proposed neural network models can be used to determine the most advantageous operational conditions for the expected concentrate assay and recovery in the coal flotation process.

关键词： coal flotation operational parameters artificial neural networks combustible recovery

Probing Co/si interface behaviour by X-ray photoelectron spectroscopy (XPs) and atomic force microscopy (AFM)

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Nuclear science and Techniques 2006年第4期17卷 202-211页

作者： PAN J. s. LIU R. s. TOK e. s. Institute of Materials Research and engineering 3 Research Link Singapore 117602 Department of Physics National University of Singapore Kent Ridge Singapore 119260

In this work, we investigate the Co-si reaction, the Co growth mode at room temperature, diffusion be- haviour as well as morphology evolution during annealing on both H-terminated and clean si(001) and si(111) sur- faces. From in-situ X-ray photoelectron spectroscopy (XPs) investigation, “Co-si” reaction appears to occur on both H-terminated and clean surfaces at room temperature (RT) and the silicide crystallinity is improved upon annealing. Co growth mode on H-terminated si surfaces occurs in a pseudo layer-by-layer manner while small close-packed is- land growth mode is observed on the clean si surface. Upon annealing at different temperatures, Co atom concentra- tion decreases versus annealing time, which in part is attributed to Co atoms inward diffusion. The diffusion behav- iour on both types of surfaces demonstrates a similar trend. Morphology study using ex-situ atomic force microscopy (AFM) shows that the islands formed on si(001) surface after annealing at 700 °C are elongated with growth direc- tions alternate between the two perpendicular [ 110 ] and [110] directions. Triangular islands are observed on si (111) surface.

关键词：钴硅金属-半导体界面反应 X射线光电子光谱学原子力显微镜方法表面形态

some Factorization Properties in A+B[Г^(*)]Domains

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Algebra Colloquium 2020年第3期27卷 643-650页

作者： e.Boulayat s.el Baghdadi Department of Mathematics Beni Mellal University FSTP.O.Box 523Beni MellalMorocco

Let A■B be an extension of integral domains andГa commutative,additive,cancellative,torsion-free monoid with T∩-Г=e.Let B[Г]be the semigroup ring ofГover B and setГ^(*)=Г\e.Then R=A+B[Г^(*)]is a subring of B[Г].We investigate various factorization properties which are weaker than unique factorization in the domainsof the form A+B[Г^(*)].

关键词： monoid factorization atomic ACCP BFD

All-electron basis sets for H to Xe specific for ZORA calculations:Applications in atoms and molecules

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Chinese Physics B 2024年第8期33卷 238-246页

作者： C.s.Gomes F.e.Jorge A.Canal Neto Departamento de Fisica Universidade Federal do Espirito Santo29075-910 VitoriaESBrazil Departamento de Fisica Instituto de Ciencias Exatas e BiologicasUniversidade Federal de Ouro Preto Campus Universitario Morro do Cruzeiro35402-136 Ouro PretoMGBrazil

A segmented basis set of quadruple zeta valence quality plus polarization functions(QZP)for H through Xe was developed to be used in conjunction with the ZORA *** set was augmented with diffuse functions to describe electrons farther away from the nuclei *** the ZORA-CCsD(T)/QZP-ZORA theoretical model,atomic ionization energies and bond lengths,harmonic vibrational frequencies,and atomization energies of some molecules were *** addition of core-valence corrections has been shown to improve the agreement between theoretical and experimental results for molecular *** atomization energies,a similar observation emerges when considering spin-orbit *** the augmented QZP-ZORA set,static mean dipole polarizabilities of a set of atoms were calculated and compared with previously published recommended and experimental *** evaluations of the ZORA and Douglas–Kroll–Hess Hamiltonians were made for each property studied.

关键词： QZP-ZORA and AQZP-ZORA basis sets elements from H to Xe CCsD(T)method atomic and molecular properties

effect of weak measurement on quantum correlations

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Chinese Physics B 2020年第11期29卷 174-181页

作者： L Jebli M Amzioug s e ennadifi N Habiballah M Nassik ePTHe Department of PhysicsFaculty of SciencesIbn Zohr UniversityAgadirMorocco Faculty of Applied sciences Ibn Zohr UniversityAit-MelloulMorocco Abdus salam International Center for Theoretical Physics Strada Costiera11 I-34151TriesteItaly LHeP-Ms Department of PhysicsFaculty of Science Mohammed V UniversityRabatMorocco Department of Physics Ecole Normale Sup´eieure(ENS)Mohammed V UniversityRabatMorocco

We investigate the local quantum uncertainty(LQU)in weak *** expression of weak LQU is explicitly ***,we consider some cases of three special X states,Werner state,circulant two-qubit states,and Heisenberg model via L... 详细信息

关键词： local quantum uncertainty weak measurement weak local quantum uncertainty

Optimized model-based control of main mine ventilation air flows with minimized energy consumption

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International Journal of Mining science and Technology 2020年第4期30卷 533-539页

作者： s.sjostrom e.Klintenas P.Johansson J.Nyqvist Department IAPI–Mining Automation ABB ABUmeå140090124Sweden

In early 2018,the Boliden Garpenberg operation implemented an optimized control strategy as an addition to the existing ventilation on demand *** purpose of the strategy is to further minimize energy use for main and booster fans,whilst also fulfilling airflow setpoints without violating constraints such as min/max differential pressure over fans and interaction of air between areas in *** air flow measurements and a dynamical model of the ventilation system,a mine-wide coordination control of fans can be carried *** numerical model is data driven and derived from historical operational data or step changes *** makes both initial deployment and lifetime model maintenance,as the mine evolves,a comparably easy *** control has been proven to operate in a stable manner over long periods without having to re-calibrate the *** prove a 40%decrease in energy use for the fans involved and a greater controllability of air ***,a 15%decrease of the total air flow into the mine will give additional proportional heating savings during winter *** in all,the multivariable controller shows a correlation between production in the mine and the ventilation system performance superior to all of its predecessors.

关键词： Mine ventilation Ventilation on demand Optimized model-based control Minimized energy consumption Advanced process control