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Approximate energies and thermal properties of a position-dependent mass charged particle under external magnetic fields

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Chinese Physics B 2017年第6期26卷 22-30页

作者： m Eshghi H mehraban s.m.Ikhdair Young Researchers and Elite Club Central Tehran BranchIslamic Azad UniversityTehranIran Faculty of Physics Semnan UniversitySemnanIran Department of Physics Faculty of ScienceAn-Najah National UniversityNablusWest BankPalestine Department of Electrical Engineering Near East UniversityNicosiaNorthern CyprusMersin 10Turkey

We solve the schrodinger equation with a position-dependent mass（PDm） charged particle interacted via the superposition of the morse-plus-Coulomb potentials and is under the influence of external magnetic and Aharonov–Bohm（AB） flux fields. The nonrelativistic bound state energies together with their wave functions are calculated for two spatially-dependent mass distribution functions. We also study the thermal quantities of such a system. Further, the canonical formalism is used to compute various thermodynamic variables for second choosing mass by using the Gibbs formalism. We give plots for energy states as a function of various physical parameters. The behavior of the internal energy, specific heat, and entropy as functions of temperature and mass density parameter in the inverse-square mass case for different values of magnetic field are shown.

关键词： schr?dinger equation morse-plus-Coulomb potentials position-dependent mass distribution functions perpendicular magnetic and Aharonov–Bohm flux fields

NUmERICAL LOCALIZATION OF ELECTROmAGNETIC ImPERFECTIONs FROm A PERTURBATION FORmULA IN THREE DImENsIONs

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Journal of Computational mathematics 2008年第2期26卷 149-195页

作者： m.Asch s.m.mefire LAmFA Université de PicardieCNRs33rue Saint-Leu80039 AmiensFrance CmAP Ecole PolytechniqueCNRSRoute de Saclay91128 PalaiseauFrance

This work deals with the numerical localization of small electromagnetic inhomogeneities. The underlying inverse problem considers, in a three-dimensional bounded domain, the time-harmonic maxwell equations formulated in electric field. Typically, the domain contains a finite number of unknown inhomogeneities of small volume and the inverse problem attempts to localize these inhomogeneities from a finite number of boundary measurements. Our localization approach is based on a recent framework that uses an as.m.totic expansion for the perturbations in the tangential boundary trace of the curl of the electric field. We present three numerical localization procedures resulting from the combination of this as.m.totic expansion with each of the following inversion algorithms： the Current Projection method, the mUltiple signal Classification （mUsIC） algorithm, and an Inverse Fourier method. We perform a numerical study of the as.m.totic expansion and compare the numerical results obtained from the three localization procedures in different settings.

关键词： Inverse problems maxwell equations Electric fields Three-dimensional inho-mogeneities Electrical impedance tomography Current projection method mUsIC algo-rithm FFT Edge elements Numerical boundary measurements

Relativistic effect of pseudospin s.m.etry and tensor coupling on the mie-type potential via Laplace transformation method

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Chinese Physics B 2014年第12期23卷 44-49页

作者： m.Eshghi s.m.Ikhdair Young Researchers and Elite Club Central Tehran Branch Islamic Azad University Department of Physics Faculty of Science An-Najah National University

A relativistic mie-type potential for spin-1/2 particles is studied. The Dirac Hamiltonian contains a scalar s（r） and a vector V（r） mie-type potential in the radial coordinates, as well as a tensor potential U（r） in the form of Coulomb potential. In the pseudospin（p-spin） s.m.etry setting Σ = Cps and Δ = V（r）, an analytical solution for exact bound states of the corresponding Dirac equation is found. The eigenenergies and normalized wave functions are presented and particular cases are discussed with any arbitrary spin–orbit coupling number κ. special attention is devoted to the caseΣ = 0 for which p-spin s.m.etry is exact. The Laplace transform approach（LTA） is used in our calculations. s.m. numerical results are obtained and compared with those of other methods.

关键词： Dirac equation mie-type potential Laplace transform approach tensor interaction p-spin s.m.etry

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Algebra Colloquium 2020年第2期27卷 193-198页

作者： s.m.Robati Department of mathematics Faculty of Science Imam Khomeini International UniversityQazvinIran

Let G be a group,and let →/ΓC(G) be a digraph whose vertices are the nontrivial conjugacy classes of G and there is an arc from a vertex C to a vertex C' if and only if C≠C' and(C)■(C').In this paper,we characteri... 详细信息

关键词： conjugacy classes posets graphs finite groups

Anomalous reactivity of thermo-bioconvective nanofluid towards oxytactic microorganisms

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Applied mathematics and mechanics(English Edition) 2020年第5期41卷 711-724页

作者： s.I.ABDELsALAm m.m.BHATTI Basic science Department Faculty of EngineeringThe British University in EgyptAl-Shorouk CityCairo 11837Egypt Instituto de matemáticas-Juriquilla Universidad Nacional Autónoma de MéxicoBlvd.Juriquilla 3001Quer´etaro 76230M´exico College of mathematics and systems science Shandong University of Science and TechnologyQingdao 266590Shandong ProvinceChina

The peristaltic flow of a non-Newtonian nanofluid with swimming oxytactic microorganisms through a space between two infinite coaxial conduits is investigated. A variable magnetic field is applied on the flow. The bioconvection flow and heat transfer in the porous annulus are formulated, and appropriate transformations are used, leading to the non-dimensionalized ruling partial differential equation model. The model is then solved by using the homotopy perturbation scheme. The effects of the germane parameters on the velocity profile, temperature distribution, concentration distribution, motile microorganism profile, oxytactic profile, pressure rise, and outer and inner tube friction forces for the blood clot and endoscopic effects are analyzed and presented *** is noticed that the pressure rise and friction forces attain smaller values for the endoscopic model than for the blood clot model. The present analysis is believed to aid applications constituting hemodynamic structures playing indispensable roles inside the human body since s.m. blood clotting disorders, e.g., haemophilia, occur when s.m. blood constituents on the artery wall get confined away from the wall joining the circulation system.

关键词： oxytactic swimming microorganism swimming variable magnetic field blood clotting endoscopy non-Newtonian fluid

长壁工作面掩护式支架合理支承能力的确定方法

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煤炭工程师 1989年第4期 57-64,F003页

作者： s.s.彭 s.m.熊 J.m.姜高斌美

一、引言在选择长壁工作面液压支架的过程中,涉及到两个主要问题:一是确定支架的合理支承能力;二是选择合理的支架类型,使其与工作的地质条件相适应。传统的支架阻力的设计主要是确定需要支承的顶板岩层的总重量,就确定支架阻力而言... 详细信息

一、引言在选择长壁工作面液压支架的过程中,涉及到两个主要问题:一是确定支架的合理支承能力;二是选择合理的支架类型,使其与工作的地质条件相适应。传统的支架阻力的设计主要是确定需要支承的顶板岩层的总重量,就确定支架阻力而言,这是一种简单的方法。可是在许多情况下,由于上覆岩层复杂,需要支承的岩层重量难以确定,因此,常常需要作某些简化和假设,而这些简化和假设可能造成很大的误差。有时,由于与实际情况的偏差太大,

关键词：长壁工作面掩护式支架支承力

Large scale silver nanowires network fabricated by meV hydrogen (H＋) ion beam irradiation

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Chinese Physics B 2016年第4期25卷 268-273页

作者： Honey s Naseem s Ishaq A maaza m Bhatti m T Wan D Center of Excellence in solid state Physics University of the Punjab Lahore Pakistan National Center for Physics Quaid-i-Azam University Islamabad 44000 Pakistan UNEsCO-UNIsA Africa Chair in Nanosciences/Nanotechnology College of Graduate Studies University of South Africa Muckleneuk ridge P. O. Box 392 Pretoria South Africa Nanosciences African Network (NANOAFNET) iThemba LABS National Research Foundation Old Faure road P. O. Box 722 Somerset West 7129 South Africa Department of Physics Bahauddin Zakariya University Multan 60800 Pakistan school of materials science and Engineering Shanghai University Shanghai 201900 China

A random two-dimensional large scale nano-network of silver nanowires （Ag-NWs） is fabricated by meV hydrogen （H＋） ion beam irradiation. Ag-NWs are irradiated under H＋ ion beam at different ion fluences at room temperature. The Ag-NW network is fabricated by H＋ ion beam-induced welding of Ag-NWs at intersecting positions. H＋ ion beam induced welding is confirmed by transmission electron microscopy （TEm） and scanning electron microscopy （s.m.. moreover, the structure of Ag NWs remains stable under H＋ ion beam, and networks are optically transparent. morphology also remains stable under H＋ ion beam irradiation. No slicings or cuttings of Ag-NWs are observed under meV H＋ ion beam irradiation. The results exhibit that the formation of Ag-NW network proceeds through three steps： ion beam induced thermal spikes lead to the local heating of Ag-NWs, the formation of s.m.le junctions on small scale, and the formation of a large scale network. This observation is useful for using Ag-NWs based devices in upper space where protons are abandoned in an energy range from meV to GeV. This high-quality Ag-NW network can also be used as a transparent electrode for optoelectronics devices.

关键词： Ag nanowires H+ ion irradiation nanowelding large scale nano-network optical properties

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邮坛巨星

邮坛巨星

Performance evaluation of a modified step-feed anaerobic/anoxic/oxic process for organic and nutrient removal

1985年

作者：（美）s.m.比尔曼张兰青译

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Chinese Journal of Chemical Engineering 2016年第3期24卷 394-403页

作者： A.R.majdi Nasab s.m.soleymani m.Nosrati s.m.mousavi Biotechnology Group Faculty of Chemical EngineeringTarbiat Modares UniversityTehranlran

A pilot scale modified step-feed process was lmproved to increase nutrient/N ano P） ano organic removal operations from municipal wastewater. It combined the step-feed process and a method named ＂University of Cape Town （UCT）＂. The effect of nutrient ratios and inflow distribution ratios were studied. The highest uptake efficiency of 95% for chemical oxygen demand （COD） has been achieved at the inflow distribution ratio of 40/35/25. However, maximum removal efficiency obtained for total nitrogen （TN） and phosphorus at 93% and 78%, respectively. The average mixed liquor suspended solids （mLss） was 5500 mg·L- 1. In addition, convenient values for dissolved oxygen （DO） concentration, and pH were obtained throughout different stages. The proposed system was identified to be an appropriate enhanced biological nutrient removal process for wastewater treatment plants owing to relatively high nutrient removal, sturdy sludge settle ability and COD removal.

关键词： Biological nutrient remova step-feed bioreactor Nitrification Denitrification Phosphorus removal