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Peristaltic Transport of Mhd Fluid Through Straight/Curved Circular Tube With Stability Analysis

Thesis Info

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External Link

Author

Yasmeen, Shagufta

Program

PhD

Institute

COMSATS University Islamabad

City

Islamabad

Province

Islamabad.

Country

Pakistan

Thesis Completing Year

2019

Thesis Completion Status

Completed

Subject

Mathemaics

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/10085

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726860741

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The phenomenon of transport of viscoelastic material in human body is a hot topic of research in biomechanical engineering. This topic has stimulated the attention of engineering scientists, modelers, numerical simulants and mathematical biologists. Biorheological flows are now experimentally exemplified by blood, bile, mucus, digestive fluids, synovial lubricants etc. On the other hand the peristaltic pumping of fluid transport is due to a wave contraction/expansion traveling along the length of a distensible channel/tube containing liquids. This mechanism generally appears from a region of lower to higher pressure. Many muscles possess such inherent characteristics. Specific examples for physiological processes may include eggs motion in the female fallopian tube, spermatozoa transportation, transport of bile in duct, intrauterine liquid transportation in the uterine cavity, blood circulation in small vessels, gall bladder with stones, locomotion of animals like larvae of certain insects and earthworms, urine passage from kidney to bladder, transport of embryo in non-pregnant uterus etc. Many biomedical systems for instance dialysis machine, blood pumps machine, heart lung machine and roller and finger pumps operate under peristalsis in order to cater the specific day to day requirements. Such activity is also quite prevalent in industrial technologies for example chamber fuel control, micro-pumps in pharmacology and toxic waste conveyance in chemical engineering. Continuous efforts for refinements in designs sure acquire much complex models of peristalsis through non-Newtonian materials. Motivated by this fact, the primary motto here is to model and analyze the peristaltic motion of non-Newtonian materials in a channel. Further the magnetomaterial aspect in such consideration has relevance with blood dynamics, blood pump machines and magnetohydrodynamic (MHD) peristaltic compressor. Blood flow rate is greatly affected under magnetic field.With this motivation, this thesis is organized as follows. First chapter provides literature review. Second chapter contains some standard definitions and flow equations. Dimensionless numbers and expressions for Jeffrey fluid are included.Third chapter examines Peristaltic flow of viscous liquid in curved tube. Fluid is electrically conducting. Relevant problem is modeled. Lubrication approach is followed for the equations in tractable form. Resulting problem is solved for asymptotic analytic solution. Axial velocity, pressure gradient and pressure rise per wavelength are analyzed in detail. Comparison with existing studies is presented. Major findings are given in conclusions. Material of this chapter is published in “Results in Physics 7 (2017) 3307-3314”, [1]. Chapter four introduces existence of Hartman boundary layer for peristaltic flow in curved tube. Equations for Jeffrey liquid in curved tube are modeled. Applied magnetic field is taken large. Both quantitative and qualitative approaches are utilized. Examination of Hartman layer is made by considering two term analytic solution using matched asymptotic technique. Traditional analysis of obtaining analytic results is extended for dynamical system of problem in order to understand the flow behavior. Nonlinear autonomous differential equations are established. These equations characterize path of fluid particles. Equilibrium plots give a complete description of various flow patterns developed for complete range of flow variable in contrast to existing reported studies which describes flow patterns at some particular value of parameter. Bifurcation diagrams are displayed. The observations of this chapter are published in “Communications in Nonlinear Science and Numerical Simulation”, [2]. Chapter five is prepared for flow of dusty liquid bounded by a stretching sheet. Constant strength of applied magnetic field is chosen. Exact analytic solution to derived problem is constructed.A comparative study with existing numerical solution is made. Skin friction and velocity results are given. Physical interpretation to influential variables in obtained solutions is assigned. Findings of this chapter are published in “Mathematical Problems in Engineering 2307469 (2017)5, [3].
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عبدالمجید سالکؔ

عبدالمجید صاحب سالک
پنجاب میں مولانا ظفر علی خاں مرحوم کے بعد ادب و صحافت کے میدان میں سب سے ممتاز اور رنگارنگ شخصیت عبدالمجید صاحب سالک مرحوم کی تھی، وہ ادیب و شاعر بھی تھے اور صحافی و مزاح نگار بھی، ان کا مذاق بڑا ستھرا اور قلم متوازن تھا، ایک زمانہ میں ان کی ذات لاہور کی ادبی سرگرمیوں کا مرکز تھی، پنجاب کے بہت سے نوجوان ادیب و صحافی ان ہی کے دامن تربیت کے پروردہ ہیں، طبعاً بڑے باغ و بہار، سخن طراز اور بزم آرا تھے، انھوں نے علم و ادب کے ساتھ ملک و ملت کی بھی خدمت انجام دی، متعدد علمی و ادبی تصانیف ان کی یادگار ہیں، ان میں ’’مسلم ثقافت ہندوستان میں‘‘ ان کے حسن مذاق کا نمونہ ہے، ابھی تھوڑے دن ہوئے ’’ہم نہیں ہوں گے‘‘ کی ردیف و قافیہ میں ان کی ایک بڑی دلکش نظم نظر سے گذری تھی، کیا معلوم تھا کہ یہ شاعری اتنی جلد واقعہ کی شکل اختیار کرلے گی، علم و ادب کی محفلوں میں مدتوں ان کی یاد آتی رہے گی، اﷲ تعالیٰ علم و ادب کے اس خادم کو اپنی رحمت و مغفرت سے سرفراز فرمائے۔
(شاہ معین الدین ندوی،نومبر ۱۹۵۹ء)

 

صرف میں غیروں کی پیروی کے نقصانات اور عمر فاروق رضی اللہ عنہ کی تعلیمات کی روشنی میں تدارک کے جہات

Islam is a religion of Nature that covers all aspects of life and guides human being to right path amid ups and downs in one’s life. But Human intellect and comprehension have limited capacities which can understand conditions or benefits of any situation or commodity for the time being. On the other hand, teachings of the Qurʻan and Sunnah are framed in accordance with the nature of human being and since Allah Almighty is the Creator of the entire Universe including the Nature so Allah had commanded to lead life in light of the His divinely inspired principles to get real success. Concept of Halal and Haram plays central role in evolving or driving attitude of a consumer with Islamic ideology. In the prevalent worldly economic system which mainly focuses on means as to how quickly satisfy desires and demands of a consumer irrespective of concept of Halal and Haram. In this context, if a consumer finds more satisfaction in having one glass of wine than milk, the consumer in question would opt for wine and would consider him or herself as successful after having his desires met within his available resources. Moreover, this particular attitude of the same consumer would be called rational act and logical because he or she gets more satisfaction, he or she was struggling or longing for. While Islam focuses on real welfare and success of an Islamic principles-inspired consumer. The consumer with Islamic belief would prefer to get real success here and hereafter by following teachings of Islam which provide for carrying out commandments of Allah

Adaptive Soft Computing Synergistic Paradigms for Vsc Based Facts Damping Controls

Adaptive Soft Computing Synergistic Paradigms for VSC Based FACTS Damping Controls Since their inception, damping of Low Frequency Oscillations (LFOs) has been a critical issue in electric power systems. Voltage Source Converter (VSC) based Flexible AC Transmission Systems (FACTS) have a renowned capability for rapid regulation of various network quantities, thus being a serious candidate for future power system control and smart grids. VSC based FACTS have built in capability of absorbing or delivering reactive power. FACTS controllers when equipped with efficient supplementary damping control combat LFOs. Although, a large research investment in efficient damping control for FACTS and advancement in the field of Artificial Intelligence (AI) has led to more robust controls. Even then, there is a growing realization that the contribution to damping performance enhancement should be more rigorously addressed for different tradeoffs, such as complexity and control effort smoothness. This dissertation puts forth the claim that efficient damping control strategy to improve application quality in terms of damping performance, control effort smoothness and execution time is essential for a high performance FACTS supplementary control. This work is a design paradigm shift from conventional Takagi Sugeno Kang (TSK) based control to advanced control based on hybrid Soft Computing (SC) techniques. SC techniques are the most lucrative choice to supplementary damping control design for their optimal performance delivery in critical applications with low complexity and high precision. The direct focus of this research is to exploit the potential of hybrid SC paradigms, obtained from diversified domains such as signal processing (Fourier and wavelets), applied mathematics (Bsplines and polynomials) and AI (neural and fuzzy), to name a few. A modular approach for optimization of overall Multiple Input Single Output (MISO) TSK structure to speculate optimal combination of antecedent and consequent parts has been proposed. The contributions of this framework are the ixdamping performance improvement with smooth control effort and improved convergence speed. The work, proposed in this thesis, has further been extended to Multiple Input Multiple Output (MIMO) structure. The parameters of controller are updated online, using gradient descent based backpropagation algorithm, to avoid offline training overhead. These synergistic paradigms are later used with indirect Multiple Input Single Output (MISO) and MIMO control to ruminate optimal control schemes. The convergence analysis based on Lyapunov stability criteria has been used to ensure the stability of control scheme and to derive an upper bound on the learning rates. In case of MIMO control, convergence is guaranteed using Adaptive Learning Rates (ALRs). These schemes are applied successively to Single Machine Infinite Bus System (SMIB) with single FACTS, multimachine system with single FACTS and multimachine system with multitype FACTS controllers. The proposed control schemes have been tested for different contingencies and various operating conditions. Finally, the qualitative behavior of all the control paradigms has been quantified using different performance indices that support the nonlinear time domain simulation results. The statistics also support the claim that an ideal performance of a supplementary damping control demands a perfect match between antecedent and consequent part of the NeuroFuzzy network. The frequency domain analysis using Wigner-Ville Distribution (WVD) has also been carried out to analyze the frequency spectra of control effort for smoothness validation. The proposed hybrid control paradigms give better performance in transient and steady-state regions.