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Rare earth based mgPm_(2)X_(4)(X=S,Se) spinel chalcogenides for spintronic and thermoelectric applications

Journal of Rare Earths 2024年第8期42卷 1577-1585,I0006页

作者： Tariq m.Al-Daraghmeh Omar Zayed Ghulam m.mustafa Taharh Zelai Bisma Younas Hind Albalawi S.Bouzgarrou Othman Hakami Q.mahmood Khaild I.Hussein Basic Sciences Department King Abdullah Ⅱ School of EngineeringPrincess Sumaya University For TechnologyP.O.Box 1438Al-jubaiha11941AmmanJordan Department of Physics Division of Science&TechnologyUniversity of EducationLahorePakistan Department of Physics Faculty of ScienceJazan University JazanSaudi Arabia Department of Physics The University of LahoreLahorePakistan Department of Physics College of SciencesPrincess Nourah bint Abdulrahman University(PNU)P.O.Box 84428Riyadh11671Saudi Arabia Department of Physics College of ScienceQassim UniversityPo.64BuraidahSaudi Arabia Laboratoire de microelectronique et Instrumentation(UR 03/13-04) Faculte des Sciences de MonastirAvenue de I'Environnement 5000MonastirTunisia Department of Chemistry Faculty of ScienceJazan University JazanSaudi Arabia Basic&Applied Scientific Research Center Department of PhysicsCollege of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam 31441Saudi Arabia Department of Radiological Sciences College of Applied Medical SciencesKing Khalid UniversityAbha61421Saudi Arabia

In current report,the structural,magnetic,and thermoelectric properties of RE doped mgPm_(2)X_(4)(X=S,Se) spinels were *** energy difference in ferromagnetic and antiferromagnetic states reveals the stability of mgPm_(2)(S/Se)_(4) in the ferromagnetic *** co mputation of enthalpy of formation also ascertains thermodynamic stability of crystal ***-dependent band structure and density of states analysis reveal ferromagnetic semiconducting character showing different electronic behavior in both spin *** room temperature ferromagnetism,spin polarization and Curie temperature are estimated from exchange energies *** addition,exchange constants(N_(0)α and N_(0)β),exchange energy Δ_(x)(pd),crystal ifeld energy,and double exchange mechanism were studied to explore the magnetic ***,the electrical conductivity,thermal conductivity,Seebeck co-efficient,and power factor show effect on electrons spin and their potential for thermoelectric devices.

关键词： Rare earth elements Spintronic applications Thermoelectric effects Exchange energies

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Simultaneous Effects of mHD and Thermal Radiation on the mixed Convection Stagnation-Point Flow of a Power-Law Fluid

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Chinese Physics Letters 2011年第7期28卷 202-205页

作者： T.Hayat m.mustafa S.Obaidat Department of mathematics Quaid-I-Azam University 45320Islamabad 44000Pakistan Department of mathematics College of ScienceKing Saud UniversityP.O.Box 2455Riyadh 11451Saudi Arabia Research Centre for modeling and Simulation National University of Sciences and TechnologySector H-12IslamabadPakistan

magnetohydrodynamic(mHD)mixed convection stagnation-point flow and heat transfer of power-law fluids towards a stretching surface is *** homotopy analysis method(HAm)is used in finding the series solution for a nonlinear *** form solutions for velocity and temperature fields are presented in the limiting *** results are *** is found that velocity and temperature are decreasing functions of power law *** computations for shear stress coefficient and local Nusselt number are *** present results are also compared with the existing numerical solution in a limiting sense.

关键词： problem limiting stretching

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Time-dependent three-dimensional flow and mass transfer of elastico-viscous fluid over unsteady stretching sheet

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Applied mathematics and mechanics(English Edition) 2011年第2期32卷 167-178页

作者： T.HAYAT m.mustafa A.A.HENDI Department of mathematics Quaid-I-Azam University Department of Physics Faculty of ScienceKing Saud University

This article studies the three-dimensional boundary layer flow of an elastico- viscous fluid over a stretching surface. Velocity of the stretching sheet is assumed to be time-dependent. Effect of mass transfer with higher order chemical reaction is further considered. Computations are made by the homptopy analysis method （HAm）. Con- vergence of the obtained series solutions is explicitly analyzed. Variations of embedding parameters on the velocity and concentration are graphically discussed. Numerical com- putations of surface mass transfer are reported. Comparison of the present results with the numerical solutions is also given.

关键词： unsteady flow mass transfer viscoelastic fluid homptopy analysis methodsolution

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Heat transfer analysis in the flow of Walters' B fluid with a convective boundary condition

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Chinese Physics B 2014年第8期23卷 382-388页

作者： T.Hayat Sadia Asad m.mustafa Hamed H.Alsulami Department of mathematics Quaid-i-Azam University 45320 Department of mathematics Faculty of Science King Abdulaziz University School of Natural Sciences National University of Science and Technology (NUST)

Radiative heat transfer in the steady two-dimensional flow of Walters＇ B fluid with a non-uniform heat source/sink is investigated. An incompressible fluid is bounded by a stretching porous surface. The convective boundary condition is used for the thermal boundary layer problem. The relevant equations are first simplified under usual boundary layer assumptions and then transformed into a similar form by suitable transformations. Explicit series solutions of velocity and temperature are derived by the homotopy analysis method （HAm）. The dimensionless velocity and temperature gradients at the wall are calculated and discussed.

关键词： Walters' B fluid heat source/sink convective boundary condition analytic solution

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Influence of Non-linear Radiation Heat Flux on Rotating maxwell Fluid over a Deformable Surface: A Numerical Study

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Communications in Theoretical Physics 2018年第4期69卷 461-466页

作者： m.mustafa A.mushtaq T.Hayat A.Alsaedi School of Natural Sciences (SNS) National University of Sciences and Technology (NUST) Research Centre for modeling and Simulation (RCmS) National University of Sciences and Technology (NUST) Department of mathematics Quaid-I-Azam University 45320 Department of mathematics Faculty of Science King Abdulaziz University

mathematical model for maxwell fluid flow in rotating frame induced by an isothermal stretching wall is explored numerically. Scale analysis based boundary layer approximations are applied to simplify the conservation relations which are later converted to similar forms via appropriate substitutions. A numerical approach is utilized to derive similarity solutions for broad range of Deborah number. The results predict that velocity distributions are inversely proportional to the stress relaxation time. This outcome is different from that observed for the elastic parameter of second grade fluid. Unlike non-rotating frame, the solution curves are oscillatory decaying functions of similarity variable. As angular velocity enlarges, temperature rises and significant drop in the heat transfer coefficient occurs. We note that the wall slope of temperature has an asymptotically decaying profile against the wall to ambient ratio parameter. From the qualitative view point, temperature ratio parameter and radiation parameter have similar effect on the thermal boundary layer. Furthermore, radiation parameter has a definite role in improving the cooling process of the stretching boundary.A comparative study of current numerical computations and those from the existing studies is also presented in a limiting case. To our knowledge, the phenomenon of non-linear radiation in rotating viscoelastic flow due to linearly stretched plate is just modeled here.

关键词： rotating frame maxwell model thermal radiation stretching sheet shooting method boundary layer flow

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Stagnation-point flow of couple stress fluid with melting heat transfer

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Applied mathematics and mechanics(English Edition) 2013年第2期34卷 167-176页

作者： T.HAYAT m.mustafa Z.IQBAL A.ALSAEDI Department of mathematics Quaid-i-Azam University Department of mathematics Faculty of ScienceKing Abdulaziz University Research Centre for modeling and Simulation (RCmS) National University of Sciences and Technology (NUST)

melting heat transfer in the boundary layer flow of a couple stress fluid over a stretching surface is investigated. The developed differential equations are solved for homotopic solutions. It is observed that the velocity and the boundary layer thickness are decreasing functions of the couple stress fluid parameter. However, the temperature and surface heat transfer increase when the values of the couple stress fluid parameter increase. The velocity and temperature fields increase with an increase in the melting process of the stretching sheet.

关键词： couple stress fluid melting heat transfer stagnation-point flow series solution

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Peristaltic motion of third grade fluid in curved channel

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Applied mathematics and mechanics(English Edition) 2014年第1期35卷 73-84页

作者： S.HINA m.mustafa T.HAYAT F.E.ALSAADI Department of mathematical Sciences Fatima Jinnah Women University School of Natural Sciences (SNS) National University of Sciences and Technology (NUST) Department of mathematics Quaid-i-Azam University Department of Electrical and Computer Engineering Faculty of Engineering

＂ Analysis is performed to study the slip effects on the peristaltic flow of non-Newtonian fluid in a curved channel with wall properties. The resulting nonlinear partial differential equations are transformed to a single ordinary differential equation in a stream function by using the assumptions of long wavelength and low Reynolds number. This differential equation is solved numerically by employing the built-in routine for solving nonlinear boundary value problems （BVPs） through the software mathematica. In addition, the analytic solutions for small Deborah number are computed with a regular perturbation technique. It is noticed that the symmetry of bolus is destroyed in a curved channel. An intensification in the slip effect results in a larger magnitude of axial velocity. Further, the size and circulation of the trapped boluses increase with an increase in the slip parameter. Different from the case of planar channel, the axial velocity profiles are tilted towards the lower part of the channel. A comparative study between analytic and numerical solutions shows excellent agreement.

关键词： third grade fluid slip condition peristalsis curved channel mathematicalmodeling

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The Effect of mg2+Substitution with Li1+on Structural and Optical Properties of Zn0.5Li2xmg0.5-xFe2O4Nanoparticles

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Open Journal of Applied Sciences 2019年第9期9卷 702-709页

作者： N.A.Elthair Yousef A.Alsabah Eltayeb m.mustafa Abdelrahman A.Elbadawi Abdal Sakhi.Suliman Department of Physics Faculty of Science and TechnologyAl Neelain UniversityKhartoumSudan Department of Physics Faculty of ScienceJazan UniversityJazanKSA Department of Physics Faculty of Education and Applied ScienceHajjah UniversityHajjahYemen Faculty of Basic Studies Future UniversityKhartoumSudan

Nanoferrite materials had been synthesized to produce new alternate substance for reducing the rare or high cost of industrial materials. In this work, the Zn0.5mg0.5-xLi2xFe2O4 nanoferrite (x = 0.00, 0.10, 0.20, 0.30 and 0.40) was prepared by co-precipitation approach. Structural and optical properties were investigated for the Zn0.5mg0.5-xLi2xFe2O4 series by X-ray diffraction (XRD), Fourier transforms infrared (FTIR) and ultraviolet-visible (UV-Vis) spectroscopies. The XRD data showed that all samples of Zn0.5mg0.5-xLi2xFe2O4 series possess a cubic spinel with a space group (Fd-3m) structure and crystallite size decreased from 116 to 96 nm with a doping ratio. Lattice parameter founded to increases with Li1+ ratio that result in the larger ionic radius of the Li1+ cation. FTIR result verified the formation of spinel structure by appearance of the absorption bands around 420, 580 cm-1. The energy band gap computed for Zn0.5mg0.5-xLi2xFe2O4 samples and it founded in the range of 3.28 - 3.12eV.

关键词： Crystal Structure FTIR Zn-Li Nanoferrite XRD Uv.vis Zn-Li Nanoparticles

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Physical Properties Study of Zn_(0.5)mn_(0.5−x)Li_(2x)Fe_(2)O_(4) Nanoparticle Series that Prepared by Co-Precipitation method

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Journal of materials Science and Chemical Engineering 2019年第11期7卷 15-21页

作者： N.A.Elthair Yousef A.Alsabah Eltayeb m.mustafa Abdelrahman A.Elbadawi Abdal Sakhi Suliman Ali A.S.marouf Department of Physics Faculty of Science and TechnologyAl Neelain UniversityKhartoumSudan Department of Physics Faculty of ScienceJazan UniversityJazanKingdom of Saudi Arabia Department of Physics Faculty of Education and Applied ScienceHajjah UniversityHajjahYemen Faculty of Basic Studies Future UniversityKhartoumSudan Institute of Laser Sudan University of Science and TechnologyKhartoumSudan

Co-precipitation is an important issue in chemical analysis, where it is often undesirable, but in some cases, it can be exploited. The Zn0.5mn0.5−xLi2xFe2O4 nanomaterials (x = 0.0, 0.1, 0.2, 0.3 and 0.4) was afforded by utilizing co-precipitation method. The structural and optical characteristics were analyzed for the samples employing X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR) and Ultraviolet-visible spectrophotometer (UV-Vis). XRD revealed that the structure of certain nanoparticles is a cubic spinel with space group (Fd-3m) and crystallite size in the scale 124 - 150 nm. Lattice parameter was determined to increments with Li+1 and that may occur due to the larger ionic radius of the Li1+ ion. FTIR spectroscopy confirmed the form of spinel ferrite and explicated the properties of absorption bands approximately 593, 1111, 1385, 1640, 2922 and 3430. The energy band gap was estimated for all samples with diverse ratios and was observed in the range of 2.58 - 2.52 eV.

关键词： Zn_(0.5)mn_(0.5-x)Li_(2x)Fe_(2)O_(4) Nano Ferrites XRD UV.vis FTIR Co-Precipitation Spinel Structure Ferrite Nanoparticles Optical Properties

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粤港澳大湾区绿色金融合作模式探析

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银行家 2020年第1期 64-67页

作者：梁刚赵振宇 m.mustafa Ozguven 广西财经学院中国社会科学院工业经济研究所对外经济贸易大学

2017年6月14日召开的国务院常务会议决定,在浙江、江西、广东、贵州、新疆5省(区)选择部分地方,建设各有侧重、各具特色的绿色金融改革创新试验区。作为绿色金融试点省之一的广东,在建设粤港澳大湾区的过程中,如何推动该区域内的绿色金... 详细信息

2017年6月14日召开的国务院常务会议决定,在浙江、江西、广东、贵州、新疆5省(区)选择部分地方,建设各有侧重、各具特色的绿色金融改革创新试验区。作为绿色金融试点省之一的广东,在建设粤港澳大湾区的过程中,如何推动该区域内的绿色金融合作,从而促进整个大湾区的协同发展,值得深入研究。本文首先分析了粤港澳大湾区与国外知名湾区的差距,然后分析了大湾区经济可持续发展中存在的问题,据此提出大湾区实施绿色金融合作的必要性。继而梳理大湾区绿色金融合作面临的主要问题,提出了绿色金融合作模式设计方案。

关键词：粤港澳大湾区绿色金融金融改革创新协同发展合作模式经济可持续省(区) 设计方案

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