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f(G,T) Gravity with Cylindrically Symmetric Relativistic Fluids

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Communications in Theoretical Physics 2019年第2期71卷 220-230页

作者： m.Farasat Shamir m.awais Sadiq Department of Sciences and Humanities National University of Computer and Emerging SciencesLahore CampusLahorePakistan

The aim of this paper is to examine the structure scalars with account of f(G, T) theory of gravity. We consider the cylindrically symmetric spacetime with dissipative anisotropic background. We have determined the structure scalars by orthogonally decomposing the Riemann curvature tensor and it is shown that these scalars are associated with fundamental properties of fluid. We further investigate the mass function along with the transport equation and discuss their role on the evolutionary stages of relativistic stellar systems. We have also analyzed these structure scalars for static fluid distributions and it is concluded that all possible solutions of field equations can be expressed through these scalars.

关键词： f(G,T) gravity cylindrically symmetric spacetime structure scalars

Unsteady Squeezing Flow of Jeffery Fluid between Two Parallel Disks

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Chinese Physics Letters 2012年第3期29卷 135-138页

作者： A.Qayyum m.awais A.Alsaedi T.Hayat Department of mathematics Quaid-I-Azam University 45320Islamabad 44000Pakistan Department of mathematics Faculty of ScienceKing Abdulaziz UniversityP.O.Box 80257Jeddah 21589Saudi Arabia

We investigate an unsteady axisymmetric flow of a Jeffrey fluid between two parallel *** relevant partial differential equations are modeled and simplified by using appropriate *** resulting ordinary differential system is solved and a series solution is *** of various parameters of interest on the flow quantities are *** is found that the velocity profile increases when porosity and squeezing parameters are increased.

关键词： ordinary unsteady flow

Newtonian heating in stagnation point flow of Burgers fluid

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Applied mathematics and mechanics(English Edition) 2015年第1期36卷 61-68页

作者： T.HAYAT S.ALI m.awais m.S.ALHUTHALI Department of mathematics Quaid-i-Azam University Nonlinear Analysis and Applied mathematics (NAAm) Research Group Faculty of Science King Abdulaziz University Faculty of Engineering Sciences Ghulam Ishaq Khan Institute of Engineering Sciences and Technology Department of mathematics COMSATS Institute of Information Technology

The Newtonian heating effects in the stagnation point flow of a Burgers fluid are addressed in this paper. The boundary layer flow problems are stated in the spatial domain from zero to infinity. The solution expressions for the velocity and the temperature are obtained and examined for the influential variables. The tabulated values show comparison with the previous results. It is observed that the obtained results are in good agreement with the existing results in limiting sense.

关键词： Burgers fluid Newtonian heating series solutions

Numerical Analysis of magnetohydrodynamic Navier’s Slip Visco Nanofluid Flow Induced by Rotating Disk with Heat Source/Sink

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Communications in Theoretical Physics 2019年第9期71卷 1075-1083页

作者： m.awais S.Bilal m.Y.malik Khalil-ur-Rehman Department of mathematics AIR UniversitySector E-9Air ComplexIslamabad44000Pakistan Department of mathematics College of SciencesKing Khalid UniversityAbha61413Saudi Arabia Department of mathematics Quaid-i-Azam UniversityIslamabad44000Pakistan

Current exertion is made to depict and search out the flow features imparted to viscid fluid flow over a rotational disk. Impression of magnetic field with rotating fluid is generated by interacting it in radial *** structured particles with magnetized fluid are also incorporated in the upshot of chemical reaction and absorptive/generative heat induction. Von Kumaran procedure is executed to obtain flow narrating differential *** pattern regarding thermal, momentum profiles are comprehended with the support of shooting method and RungeKutta methods. Furthermore, to get more realistic view of result description computational algorithm is modified by improving Runge-Kutta coefficients with Cash and Carp method. The aspects of flow controlling parameters like momentum slip parameter, magnetic strength parameter, Brownian motion parameter, thermophoresis parameter are adorned in sketches. Findings of these architects are accumulated in conclusion section.

关键词： heat generation/absorption viscous fluid model nanoparticles rotating disk Navier slip Cash and Carp method

Axisymmetric Powell-Eyring fluid flow with convective boundary condition: optimal analysis

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Applied mathematics and mechanics(English Edition) 2016年第7期37卷 919-928页

作者： T.HAYAT S.mAKHDOOm m.awais S.SALEEm m.m.RASHIDI Department of mathematics Quaid-i-Azam University Department of mathematics COMSATS Institute of Information Technology Department of mathematics Statistics and Physics Qatar University Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal management Systems Tongji University

The effects of axisymmetric flow of a Powell-Eyring fluid over an impermeable radially stretching surface are presented. Characteristics of the heat transfer process are analyzed with a more realistic condition named the convective boundary condition. Governing equations for the flow problem are derived by the boundary layer approximations. The modeled highly coupled partial differential system is converted into a system of ordinary differential equations with acceptable similarity transformations. The convergent series solutions for the resulting system are constructed and analyzed. Optimal values are obtained and presented in a numerical form using an optimal homotopy analysis method （OHAm）. The rheological characteristics of different parameters of the velocity and temperature profiles are presented graphically. Tabular variations of the skin friction coefficient and the Nusselt number are also calculated. It is observed that the temperature distribution shows opposite behavior for Prandtl and Biot numbers. Furthermore, the rate of heating/cooling is higher for both the Prandtl and Biot numbers.

关键词： axisymmetric flow optimal homotopy analysis method (OHAm) analysis,convective boundary condition

Convective heat transfer analysis for mHD peristaltic flow in an asymmetric channel

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International Journal of Biomathematics 2014年第3期7卷 1-15页

作者： m. awais S. Farooq H. Yasmin T. Hayatt A. Alsaedi Department of mathematicsCOmSATS Institute of Information Technology Attock Pakistan Department of mathematicsQuaid-I-Azam University 45320 Islamabad 44000 Pakistan Department of mathematicsFaculty of Science King Abdulaziz University Jeddah 21589 Saudi Arabia

magnetohydrodynamic peristaltic flow of Jeffery fluid in an asymmetric channel is addressed. The channel walls satisfy the convective conditions. Asymmetry here is con- sidered due to wave trains of different amplitudes and phases. Solutions for the velocity, temperature and pressure gradient are obtained using long wavelength approximation. Plots reflecting the impact of various parameters of interest are shown and examined.

关键词： Jeffery fluid convective boundary conditions pumping and trapping.

Laplace Transform method for Unsteady Thin Film Flow of a Second Grade Fluid through a Porous medium

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Journal of modern Physics 2014年第3期5卷 103-106页

作者： m. Ali m. awais Department of mathematics and Statistics University of Victoria Victoria Canada Department of mathematics COMSATS Institute of Information Technology Islamabad Pakistan

In this article, we have effectively used the Numerical Inversion of Laplace transform to study the time-dependent thin film flow of a second grade fluid flowing down an inclined plane through a porous medium. The solution to the governing equation is obtained by using the standard Laplace transform. However, to transform the obtained solutions from Laplace space back to the original space, we have used the Numerical Inversion of Laplace transform. Graphical results have been presented to show the effects of different parameters involved and to show how the fluid flow evolves with time.

关键词： Numerical Inversion of Laplace Transform Unsteady Thin Film Second Grade Fluid

Evaluation of Different Radish (Raphanus sativus) Genotypes under Different Saline Regimes

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American Journal of Plant Sciences 2016年第6期7卷 894-898页

作者： C. m. Ayyub muhammad Rashid Shaheen Samad Raza muhammad Sarwar Yaqoob Rashad Waseem Khan Qadri muhammad Azam m. awais Ghani Imran Khan Naheed Akhtar Institute of Horticultural Sciences University of Agriculture Faisalabad Pakistan College of Agriculture and Environmental Sciences TheIslamia University of Bahawalpur Punjab Pakistan Department of Agronomy University of Agriculture Faisalabad Pakistan College of Agriculture Dera Ghazi Khan Pakistan

An effective and simple screening technique for identification of salt tolerant and salt sensitive radish genotypes was observed. Sand is used as potting media. Six genotypes of radish were used for screening against four salinity levels (0, 1, 3, 5 and 7 dS/m-1). Twenty days old seedlings of radish were salinized with salt solution (NaCl). morphological, physiological and ionic parameters were studied. Radish genotypes Laal-Pari and 40 Days executed the best performance in all the measured attributes and categorized as salt tolerant genotype while Green Neck was the poorest in retaining normal functioning at higher salinity levels thus grouped under salt sensitive cultivar.

关键词： Radish Salinity Physiological morphological Ionic Attributes Genotypes

基于计算智能技术的巴基斯坦北部地区地震活动性预测

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世界地震译丛 2020年第2期51卷 117-131页

作者： K.m.Asim m.awais F.martínez-álvarez T.Iqbal 张盛峰宋潇潇中国地震局地震预测研究所/山东省地震预报研究中心湖北省地震局

本文针对巴基斯坦北部地区进行了地震预测研究。研究方法包含了地震学和计算智能技术领域不同学科的交叉融合。针对历史地震活动计算了8种地震学参数。通过计算它们的信息增益来评估这8种参数的预测效能,进而选择了其中6种应用于预测试... 详细信息

本文针对巴基斯坦北部地区进行了地震预测研究。研究方法包含了地震学和计算智能技术领域不同学科的交叉融合。针对历史地震活动计算了8种地震学参数。通过计算它们的信息增益来评估这8种参数的预测效能,进而选择了其中6种应用于预测试验。基于这6种参数发展了多个计算智能模型用于预测试验。这些模型包括前馈神经网络、循环神经网络、随机森林、多层感知、径向基神经网络和支持向量机。本文评估了每一种模型的效能,同时利用mcNemar统计检验方法来研究计算方法的统计显著性。前馈神经网络模型在巴基斯坦北部地区可表现出统计显著性为75%准确率和78%正确预报的预测结果。

关键词：地震预报计算智能地震活动性地震前兆