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mHD axisymmetric flow of third grade fluid between porous disks with heat transfer

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Applied mathematics and mechanics(English Edition) 2012年第6期33卷 749-764页

作者： T.HAYAT A.SHAFIQ m.nawaz A.ALSAEDI Department of mathematics Quaid-i-Azam University Department of Humanities and Sciences Institute of Space Technology Department of mathematics Faculty of ScienceKing Abdulaziz University

The magnetohydrodynamic （mHD） flow of the third grade fluid between two permeable disks with heat transfer is investigated. The governing partial differential equa- tions are converted into the ordinary differential equations by suitable transformations. The transformed equations are solved by the homotopy analysis method （HAm）. The expressions for square residual errors are defined, and the optimal values of convergence- control parameters are selected. The dimensionless velocity and temperature fields are examined for various dimensionless parameters. The skin friction coefficient and the Nus- selt number are tabulated to analyze the effects of dimensionless parameters.

关键词： heat transfer axisymmetric flow third grade fluid porous disk skin fric-tion coefficient Nusselt number

Galerkin Finite Element Study on the Effects of Variable Thermal Conductivity and Variable mass Diffusion Conductance on Heat and mass Transfer

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Communications in Theoretical Physics 2018年第7期69卷 49-59页

作者： Imran Haider Qureshi m.nawaz Shafia Rana T.Zubair Department of Applied mathematics and Statistics Institute of Space and TechnologyIslamabad

This article investigates the effects of variable thermal conductivity and variable mass diffusion coefficient on the transport of heat and mass in the flow of Casson fluid. Numerical simulations for two-dimensional flow induced by stretching surface are performed by using Galerkin finite element method(GFEm) with linear shape functions. After assembly process, nonlinear algebraic equations are linearized through Picard method and resulting linear system is solved iteratively using Gauss Seidal method with simulation tolerance 10^(-8). maximum value of independent variableη is searched through numerical experiments. Grid independent study was carried out and error analysis is *** results are validated by comparing with already published results. Parametric study is carried out to explore the physics of the flow. The concentration increases when mass diffusion coefficient is increased. The concentration and thermal boundary layer thicknesses increase when ?_1 and ? are increased. The effect of generative chemical reaction on concentration is opposite to the effect of destructive chemical reaction on the concentration.

关键词： variable diffusion coefficients grid independent study convergence error analysis Nusselt num-ber Casson fluid Joule heating viscous dissipation

Synthesis and Structural Investigations of New 4-Hexyl-1-(4-nitrophenyl)-1-H-1,2,3-triazole:An Experimental and Theoretical Insight

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Chinese Journal of Structural Chemistry 2015年第12期34卷 1830-1840页

作者： mUHAmmAD Naeem Ahmed KHAWAJA Ansar Yasin TARIQ mahmood FATImA Wasim mUHAmmAD Haleem Khan m.nawaz Tahir SAFEENA Zafar SHAISTA Anjum Department of Chemistry The University of Azad Jammu and Kashmir Department of Chemistry COMSATS Institute of Information Technology Department of Chemistry Women University Bagh Azad Kashmir Department of Physics University of Sargodha

The title compound, 4-hexyl-1-（4-nitrophenyl）-1-H-1,2,3-triazole （CI4HIsN402）, was synthesized using one-pot strategy via click reaction and the structure was characterized mainly by single-crystal X-ray diffraction, NmR, FT-IR and mS. C14H18N4O2 was crystallized from an EtOH/EtOAc solution in triclinic system, space group PI, with a = 5.3679（3）, b = 7.5499（5）, c = 17.5534（11） A, a = 92.360（4）, β = 90.359（4）, γ = 98.864（4）°, V （A3） = 702.24（8）, Z = 2, crystal size （mm） = 0.42 × 0.26 × 0.18, Rint = 0.096. Packing diagram indicates that there is dimeric interaction between two units via N（3）...H（6）. The crystal structure of the title compound （1） is stabifized by intermolecular interactions. In addition, X-ray analys!s also reveals C-H…π and π-π interactions in the molecule. Theoretical investigations were performed by using Gaussian 09 software at the B3LYP/6, 31G （d,p）level of density,finctional theory （DFT）.to compare the theoretical results with the experimental and to probe structural properties. The molecular electrostatic potential （mEP） mapped over the entire stabilized geometry of the molecule indicated their chemical reactivities. Furthermore, frontier molecular orbital （electronic properties） was computed at the same level of DFT as used. forenergy minima structure.

关键词： click chemistry disubstituted triazole X-ray DFT mEP frontier molecurar orbital

Tb^(3+)substituted strontium hexaferrites:Structural,magnetic and optical investigation and cation distribution

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Journal of Rare Earths 2020年第4期38卷 402-410页

作者： m.A.Almessiere Y.Slimani H.Gungunes m.Sertkol m.nawaz N.A.Algarou A.Baykal I.Ercan Department of Biophysics Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 198231441 DammamSaudi Arabia Department of Physics College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 198231441 DammamSaudi Arabia Department of Physics Hitit University19030Cevre Yolu Bulvari-CorumTurkey Deanship of Preparatory Year Imam Abdulrahman Bin Faisal UniversityP.O.Box 198231441 DammamSaudi Arabia Department of Nanomedicine Research Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 198231441 DammamSaudi Arabia

In this study,SrFe12-xTbxO19(0.00≤x≤0.1)hexaferrites(HFs)were prepared successfully by citrate solgel approach.X-ray powder diffraction analyses affirm the hexagonal structure of *** phase starts to appear for x≥*** crystallites sizes were estimated to be in the range of 33-46 *** the products exhibit inhomogeneous distribution of grain size detected through *** analyses of magnetization versus applied magnetic field,m(H),were *** measurements were done at room(300 K;RT)and low(10 K)*** different magnetic parameters including saturation magnetization ms,remanence mr,squareness ratio(SQR=mr/ms),coercivity Hc,and magnetic moment nB are deduced and discussed in *** both considered temperatures,m(H)results show ferrimagnetic nature for all *** is shown that the Tb substitutions significantly affect m(H)data.A significant increase in the ms,mr,and nB is observed for x=0.02 *** SQR values are around 0.5 indicating the single domain nature with uniaxial *** obtained magnetic results were investigated deeply with relation to structural and microstructural *** spectroscopy results were also *** to mossbauer results,the Tb3+ions preferentially occupy 12 k and 4f2 sites.

关键词： m-type hexaferrites Structure mossbauer spectroscopy Optical properties magnetization Rare earths

The Strategic Form of Quantum Prisoners' Dilemma

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Chinese Physics Letters 2013年第5期30卷 4-9页

作者： Ahmad nawaz National Centre for Physics Quaid-i-Azam University CampusIslamabad 45320Pakistan

In a normal form, prisoners' dilemma (PD) is represented by a payoff matrix showing players' strategies and payoffs. To obtain the distinguishing trait and strategic form of PD, certain constraints are imposed on the elements of its payoff matrix. We quantize PD by a generalized quantization scheme to analyze its strategic behavior in the quantum domain. The game starts with a general entangled state of the form |ψ>=cos(ξ/2)|00>+sin(ξ/2)|11> and the measurement for payoffs is performed in entangled and product bases. We show that for both measurements, there exist respective cutoff values of entanglement of the initial quantum state up to which the strategic form of the game remains intact. Beyond these cutoffs the quantized PD behaves like the chicken game (CG) up to another cutoff value. For the measurement in the entangled basis the dilemma is resolved for sinξ >1/7 with Q⊗Q as a Nash Equilibrium (NE). However, the quantized game behaves like PD when sinξ >1/3;whereas in the range 1/7measurement in the product basis the quantized PD behaves like classical PD for sin^(2)(ξ/2) <1/3 with D⊗D as an NE. In region 1/3

关键词： bases behave strategic

Quantum State Tomography and Quantum Games

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Chinese Physics Letters 2012年第3期29卷 37-40页

作者： Ahmad nawaz National Centre for Physics Quaid-i-Azam University CampusIslamabadPakistan

A technique is developed for single qubit quantum state tomography using the mathematical setup of generalized quantization scheme for *** this technique,Alice sends an unknown pure quantum state to Bob who appends it with|0>m state and finds the payoffs for Alice and *** is shown that for a particular set of unitary operators,these payoffs are equal to Stokes parameters for an unknown quantum *** this way an unknown quantum state can be measured and *** speaking,this technique is not a game as no strategic competitions are involved.

关键词： state quantum operators

Distributed Stochastic Security Constrained Unit Commitment for Coordinated Operation of Transmission and Distribution System

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CSEE Journal of Power and Energy Systems 2021年第4期7卷 708-718页

作者： Aamir nawaz Hongtao Wang Key Laboratory of Power System Intelligent Dispatch and Control of ministry of Education Shandong UniversityJinan 250000China

With the high penetration of renewable energies in modern power systems,deterministic coordination algorithms are facing two major problems:one is degradation in accuracy if fewer scenarios are utilized for uncertainty evaluation while second is the high computational time if a high number of scenarios are considered for better accuracy・In both cases,the efficiency of the algorithm is degraded・To solve these problems in coupled transmission system and distribution systems(TSDS),probabilistic coordination algorithms are adopted to solve with less *** this paper,a TSDS probabilistic coordination model is proposed to solve the coordinated security-constrained unit commitment problem.A mean and standard deviation matching based probabilistic analytical target cascading algorithm has been utilized for evaluation of TSDS coordination *** of solving each scenario as a separate problem,the proposed algorithm considers a single coordination problem with probabilistic characteristics as shared variables and hence,achieves fast convergence・Different case studies are performed to prove the efficacy of the proposed *** verify that the proposed algorithm reduces computational time and resources for large-scale systems.

关键词： Distribution system mean probabilistic analytical standard deviation target Cascading transmission system

Dufour and Soret effects on mHD flow of viscous fluid between radially stretching sheets in porous medium

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Applied mathematics and mechanics(English Edition) 2012年第11期33卷 1403-1418页

作者： m. nawaz T. HAYAT A. ALSAEDI Department of Humanities and Sciences Institute of Space Technology Department of mathematics Quaid-I-Azam University Department of mathematics Faculty of Science King Abdulaziz University

The aim of this paper is two-dimensional magnetohydrodynamic viscous fluid bounded by infinite sheets to examine the Dufour and Soret effects on the （mHD） steady flow of an electrically conducting An incompressible viscous fluid fills the porous space. The mathematical analysis is performed in the presence of viscous dissipation, Joule heating, and a first-order chemical reaction. With suitable transformations, the governing partial differential equations through momentum, energy, and concentration laws are transformed into ordinary differential equations. The resulting equations are solved by the homotopy analysis method （HAm）. The convergence of the series solutions is ensured. The effects of the emerging parameters, the skin friction coefficient, the Nusselt number, and the Sherwood number are analyzed on the dimensionless velocities, temperature, and concentration fields.

关键词： magnetohydrodynamic (mHD) flow radial stretching Soret and Dufoureffects porous medium skin friction coefficient

Risk-aware Distributed Optimal Power Flow in Coordinated Transmission and Distribution System

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Journal of modern Power Systems and Clean Energy 2021年第3期9卷 502-515页

作者： Aamir nawaz Hongtao Wang Key Laboratory of Power System Intelligent Dispatch and Control of ministry of Education Shandong UniversityJinan 250000China

Active distribution grids cause bi-directional power flow between transmission system(TS)and distribution system(DS),which not only affects the optimal cost but also the secure operation of the power *** paper proposes a hybrid coordination method to solve the risk-aware distributed optimal power flow(RA-DOPF)problem in coordinated TS and *** operation risk evaluation,the weather-based contingencies are considered in both TS and DS.A hybrid coordination method is developed that entails analytical target cascading(ATC)and Benders decomposition(BD).moreover,the risk-aware optimal power flow(RAOPF)in TS and risk-based security-constrained optimal power flow in DS have been performed using the BD method considering basic optimal power flow as a master problem,whereas N-1 and N-2 contingencies are considered as *** case studies are performed using the IEEE 30-bus system with generation reserves as a TS and a 13-bus system as a *** results demonstrate the efficacy of the proposed method.

关键词： Analytical target cascading Benders decomposition distribution system preventive and corrective contingen-cies risk awareness transmission system