67 results on '"Muhammad, Shoaib Anwar"'
Search Results
2. Application of fractional derivatives in a Darcy medium natural convection flow of MHD nanofluid
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Mumtaz Khan, Amer Rasheed, Muhammad Shoaib Anwar, and Syed Touqeer Hussain Shah
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Distributed order fractional derivative ,Nanofluid ,Natural Convection ,Darcy medium ,Numerical algorithm ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Nanofluid thermophysical characteristics are critical for predicting heat transfer behavior. This attempt provides a computational assessment of boundary layer flow and heat transfer behavior of fractional Maxwell viscoelastic nanofluid and their hybrids over a permeable vertical surface. The effects of Lorents and buoyancy forces are also considered in the flow region. The flow problem is modeled with novel distributed order time fractional derivatives to achieve control of the flow and heat transfer. Mid-point quadrature approach is used to process the distributed order integrals, whereas nonlinear coupled time fractional derivatives are discretized through the finite difference method along withL1- algorithm. The results shows that heat transfer rate enhanced 56.51% by enhancing the thermal Grashof number. Further, increase in nanoparticles volume fraction causes enhancement in thermal conductivity. More effects of the flow characteristic on velocity and temperature fields are shown graphically and analyzed in detail. The involvement of novel distributed fractional order derivatives, and nanoparticles enhanced the importance of the simulated results, which can be helpful to effectively control related thermal engineering issues, like temperature management in internal combustion engines, cooling devices, and heat exchangers.
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- 2023
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3. Mixed convective flow of CNTs nanofluid subject to varying viscosity and reactions
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Zakir Hussain, Tasawar Hayat, Ahmed Alsaedi, and Muhammad Shoaib Anwar
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Medicine ,Science - Abstract
Abstract The addressed work explains SWCNTs (Single walled carbon nanotubnes) and MWCNTs (Multi walled carbon nanotubnes) nanofluid flow under the influences of temperature dependent viscosity and mixed convection. Comparative study of SWCNTs and MWCNTs suspended in base liquid is presented. Further heat and mass transfer are addressed for nanofluid effected by radiation, heat generation/absorption and diffusion species. Mathematical development of problem is taken in cylindrical coordinates. System of highly nonlinear differential equations are constructed via appropriate transformations. The system of equations are tackled numerically by bvp4c MATLAB solver. The findings of the study show that larger volume fraction $$\left( \phi \right)$$ ϕ contributes to enhance the nanoliquid flow. The velocity by submerging MWCNTs is noted higher than SWCNTs. Furthermore, the relationship between the viscosity variable $$\left( \theta _{r}\right)$$ θ r and the temperature is such that the temperature near the surface decreases with increase in $$\left( \theta _{r}\right)$$ θ r , while at the same time the temperature away from the surface increases. Subsequently, higher temperature is observed in SWCNTs-liquid compared to the MWCNTs-liquid to the similar values of $$\left( \theta _{r}\right)$$ θ r . Further, heat transfer is an increasing function of varying viscosity variable $$\left( \theta _{r}\right)$$ θ r .
- Published
- 2021
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4. Entropy analysis in mixed convective flow of hybrid nanofluid subject to melting heat and chemical reactions
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Zakir Hussain, Ali Saleh Alshomrani, Taseer Muhammad, and Muhammad Shoaib Anwar
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Temperature dependent viscosity ,Molybdenum sulphide ,Graphene oxide ,Entropy generation ,Melting heat ,Reactions ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
The present study discloses entropy analysis in flow of hybrid nanofluid under the influences of magnetohydrodynamics, variable viscosity and mixed convection. Melting heat, heat generation and radiation effects have been implemented for the second law of thermodynamics analysis. Homogeneous reaction of cubic auto-catalyst and first order heterogenous reaction regulate the concentration. Graphene oxide (GO) and molybdenum-disulphide(MoS2) are dealt as nanomaterials and water as a continuous phase liquid. Second law of thermodynamics is utilized for the formulation of entropy optimization rate. Bejan number has examined for the irreversibility process due to heat and mass transfers. Variations in entropy rate and Bejan number have been studied under the influences of sundry variables. Furthermore, comparative analysis of nanoliquid and hybrid nanoliquid has been examined for the entropy generation and Bejan number. Cylindrical coordinate system is taken for the problem formulation. Bvp4c maltab solver is used to deal with the obtained boundary layer problems. The findings of this study reveal that entropy rate and Bejan number in hybrid nanoliquid flow are noted maximum than the normal nanoliquid. The irreversibility due to heat transfer and entropy generation can be controlled by melting variable and temperature dependent viscosity variable.
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- 2022
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5. Numerical modeling of mixed convective nanofluid flow with fractal stochastic heat and mass transfer using finite differences.
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Muhammad Shoaib Arif, Kamaleldin Abodayeh, Yasir Nawaz, Andaç Batur Çolak, Muhammad Shoaib Anwar, and Muavia Mansoor
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CONVECTIVE flow ,FINITE differences ,MASS transfer ,NANOFLUIDICS ,STOCHASTIC partial differential equations ,HEAT transfer ,NON-Newtonian flow (Fluid dynamics) - Abstract
This study presents the first comprehensive numerical simulation of heat and mass transfer in fractal-like mixed convective nanofluid flows. The flow of non-Newtonian nanofluids over flat and oscillating sheets is modelled mathematically, and a finite difference scheme is used to solve this model. The two-stage scheme can tackle fractal and fractal stochastic mathematical models of partial differential equations. The consistency in the mean square is proved, and Fourier series stability analysis is adopted to find stability conditions for fractal stochastic partial differential equation. The scheme is applied to solve the unsteady Casson nanofluid flow over the flat and oscillatory sheet, which affects thermal radiation, heat source, and chemical reaction. The existence of the solution is also provided for the Navier-Stokes equation of the considered flow model using fractal time derivative. The graph illustrates that the proposed fractal technique achieves faster convergence than the Crank-Nicolson approach. Applications in energy systems, materials science, and environmental engineering are just a few of the domains that could benefit from a better understanding of mixed convective nanofluid flows with fractal features, and that is what this research study hopes to accomplish. Scientists and engineers may better develop efficient and environmentally friendly systems by simulating and analyzing these complicated processes with the suggested finite difference technique. [ABSTRACT FROM AUTHOR]
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- 2024
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6. Electrified fractional nanofluid flow with suspended carbon nanotubes.
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Muhammad Shoaib Anwar, Rana Tariq Mehmood Ahmad, Tahir Shahzad, Muhammad Irfan, and Muhammad Zeeshan Ashraf
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- 2020
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7. Heat convection in a viscoelastic nanofluid flow: A memory descriptive model
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Muhammad Shoaib Anwar, V Puneeth, Majid Hussain, Zakir Hussain, and Muhammad Irfan
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Mechanical Engineering ,Civil and Structural Engineering - Published
- 2023
8. Effects of first-order chemical reaction and melting heat on hybrid nanoliquid flow over a nonlinear stretched curved surface with shape factors
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Zakir Hussain, Saima Muhammad, and Muhammad Shoaib Anwar
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Mechanical engineering and machinery ,TJ1-1570 - Abstract
The aim of the current study is to disclose the results of shape factor analysis of the flow of a hybrid nanofluid over a curved sheet. The flow is caused by a stretchable curved sheet. Mathematical modeling and analyses have been performed in the presence of curvature, melting heat and heterogeneous-homogeneous reactions. Autocatalysis and the coefficients of the reactant are dealt with in a similar manner. The physical properties of the fluid, including the fluid velocity, the heat and mass transfer properties, the skin friction and the Nusselt number have been acquired and analyzed under the influences of the dimensionless curvature, melting and heterogeneous–homogeneous reaction variables. Boundary layer approximations are used in the mathematical formulation. Suitable transformations have been used to transform differential equations into nonlinear ordinary differential equations. The resulting nonlinear system of equations has been analyzed via the matlab bvp4c solver. Comparisons of nanoliquids with the hybrid nanoliquid are presented through graphs and tables. The results of this analysis show that the skin friction and the heat transfer rate in the hybrid nanofluid are seen more prominently than those of the nanofluid for larger values of the curvature parameter k .
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- 2021
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9. Simulations of variable concentration aspects in a fractional nonlinear viscoelastic fluid flow.
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Amer Rasheed and Muhammad Shoaib Anwar
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- 2018
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10. Numerical computations of fractional nonlinear Hartmann flow with revised heat flux model.
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Amer Rasheed and Muhammad Shoaib Anwar
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- 2018
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11. Mullite-bonded porous SiC-based Mn3O4–Ni system: control of electrical resistivity, flexural strength, and extrusion
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Muhammad Shoaib Anwar, Syed Zaighum Abbas Bukhari, Jang-Hoon Ha, Jongman Lee, and In-Hyuck Song
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Ceramics and Composites - Published
- 2022
12. Simulations of a fractional rate type nanofluid flow with non-integer Caputo time derivatives.
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Muhammad Shoaib Anwar and Amer Rasheed
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- 2017
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13. Unsteady thin film flow with ohmic heating and chemical reactions
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Nahid Fatima, Maha M. A. Lashin, Muhammad Shoaib Anwar, Mumtaz Khan, and V. Puneeth
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Statistical and Nonlinear Physics ,Condensed Matter Physics - Abstract
In this study, we have analyzed magnetohydrodynamic (MHD) consequences on the heat and mass transmission within unsteady dissipated liquid film flow. Flow is generated due to stretchable surface accompanied with effects of ohmic heating, chemical reaction and heat absorption. Moreover, the flow governing partial differential equations (PDEs) are further modified into equivalent ordinary differential equations (ODEs) by applying regular perturbation method to get its analytical solution after that we have applied sixth-order Runge–Kutta technique to get its numerical solution. These two solutions are validating each other in the simulations. Figures are plotted to study the changes in physical quantities like skin friction coefficient, concentration, velocity, temperature, Sherwood and Nusselt number with the variations of Prandtl numbers Pr, parameters of chemical reaction [Formula: see text], Eckert numbers Ec, magnetic parameter Ha (also known as Hartman number) Schmidt number and coefficient of heat absorption [Formula: see text].
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- 2023
14. Review of: 'Generalized N-metric Spaces'
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Muhammad Shoaib Anwar
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- 2023
15. Comparison of Coronary Artery Bypass Grafting Combined With Mitral Valve Repair Versus Coronary Artery Bypass Grafting Alone in Patients With Moderate Ischemic Mitral Regurgitation: A Meta-Analysis
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Muhammad Ali Sameer, Bilal Aziz Malik, Muhammad Obaid Ullah Choudry, Muhammad Shoaib Anwar, Muhammad A Nadeem, Fizza Mahmood, Muhammad Zohaib Anwar, and Sujith K Palleti
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General Engineering - Published
- 2023
16. Phenomena of thermo-sloutal time’s relaxation in mixed convection Carreau fluid with heat sink/source
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Muhammad Irfan, Pongsakorn Sunthrayuth, Amjad Ali Pasha, Muhammad Shoaib Anwar, and Waqar Azeem Khan
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General Engineering ,General Physics and Astronomy - Published
- 2022
17. Numerical analysis of nonlinear time‐fractional fluid models for simulating heat transport processes in porous medium
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Mumtaz Khan, Amer Rasheed, and Muhammad Shoaib Anwar
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Applied Mathematics ,Computational Mechanics - Published
- 2023
18. Spectrum of Medical Complications During Stroke Rehabilitation and its Associated Risk Factors
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Muhammad Shoaib Anwar, Ammar Khalid, Muhammad Zohaib Anwar, Muhammad Ali Sameer, Suleman Yousaf, Muhammad Obaid Ullah Choudry, Imran Khan, Roohi Khan, Abhiram Rao Damera, Dehiwattage Eroma Gayani Fernando, Bisni Basheer Nambipunnilath, Roaa Mohamed Ali Elbashir, Mitrasweetha A.Selvarajuh, MD Faijul Islam, Mehnaj Noor, Misha Anam
- Abstract
CMH Lahore Medical College and Institute of Dentistry CMH Lahore Medical College and Institute of Dentistry The Aga Khan University CMH Lahore Medical College and Institute of Dentistry The Aga Khan University CMH Lahore Medical College and Institute of Dentistry King Khaled Hospital Hail King Khaled Hospital Hail Mediciti Institute of Medical Sciences Health Promotion Bureau, Minstry of Health, Sri Lanka Queen Elizabeth Hospital King's Lynn Barnsley Hospital NHS Foundation Trust English Division of Medical University of Łódź Queen Alexandra Hospital Portsmouth Royal Hampshire County Hospital Winchester Children Hospital & The Institute of Child Health, Lahore Abstract Background Incidence of stroke is persistently increasing followed by effective medical treatment resulting in high number of stroke survivors. Post stroke recovery is critical necessitating sufficient knowledge, effective prevention and control of chronic diseases, pre-existing complications, and potential risk factors. Objective This study aimed to identify and evaluate potential risks and prognostic factors that can negatively influence post stroke rehabilitation in order to prevent, readily diagnose, and promptly manage the most common manifestations of stroke. Study Design Cross-sectional observational study conducted at Stroke Rehabilitation Center, Lahore, Pakistan with the sample size of 120 patients, selected by using convenient sampling. Results One hundred and twenty stroke survivors admitted in neurorehabilitation center (Age Mean±SD 56.9±12.2) were classified into 4 groups based on Modified Rankin scale: Mild (17.5%), Moderate (26.6%), Moderate to severe (39.1%), and severe impairment (16.6%). The major modifiable post stroke complications included depression (91%) and anxiety (84%). Acute infections (RTI n=69, 58%, UTI n=78, 65%) and poorly managed chronic disorders such as DM (n=59, 49.1%, 95% CI 0.5-2.5), HTN (n=34, 28%, 95% CI 1.7-2.5), and Kidney failure (n=12, 10%, 95% CI 0.4-3.5) were strongly associated with poor prognosis. Conclusion Incidence of stroke was found to be more common in adults (Age: Range=44-69 years, Mean=56.9) with no gender predominance. Most common post stroke complications were depression and anxiety, significantly influencing the recovery process. The severity of the post stroke neurological deficit was positively associated with the frequency of complications and poor neurorehabilitation. Knowledge of post stroke recovery process and effects of various factors on it is essential for the implication of effective clinical and rehabilitation interventions to minimize morbidity and subsequent post stroke disability. Keywords: brain injury. stroke recovery, neurorehabilitation, disability, stroke management
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- 2023
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19. Heat Transfer in a Fractional Nanofluid Flow through a Permeable Medium
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Muhammad Shoaib Anwar, Muhammad Irfan, Majid Hussain, Taseer Muhammad, and Zakir Hussain
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Physics::Fluid Dynamics ,Article Subject ,General Mathematics ,General Engineering - Abstract
This study examines viscoelastic fractional nanofluid flow through Darcy medium. Memory characteristics due to elasticity are explored with noninteger time derivatives. The unsteady motion of MHD flow is modeled by nonlinear differential equations. Buoyancy forces are incorporated via convection parameters in the flow domain. Fractional relaxation time is considered to control the propagation speed of temperature. A finite difference, along with finite element, a numerical algorithm has been developed for the computation of governing flow equations. Friction coefficient, Sherwood numbers, and Nusselt numbers are computed for the noninteger derivative model. Simulations revealed that noninteger numbers have congruous behavior for concentration, temperature, and velocity fields. It is also noted that heat flux, δ 1 , and mass flux, δ 2 , numbers have contradictory effects on the friction coefficient. Various flows, particularly in polymer industries and electrospinning for the production of nanofibers, can be tackled in a comparable pattern.
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- 2022
20. Controlling the electrical resistivity of porous silicon carbide ceramics and their applications: A review
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Muhammad Shoaib Anwar, Syed Zaighum Abbas Bukhari, Jang‐Hoon Ha, Jongman Lee, In‐Hyuck Song, and Young‐Wook Kim
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Marketing ,Materials Chemistry ,Ceramics and Composites ,Condensed Matter Physics - Published
- 2022
21. Fixed points in n-gonal graphical b-metric spaces under contractive conditions
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Umar Raza, Muhammad Shoaib Anwar, Hayat Ali, V Puneeth, Muhammad Irfan, and Zakir Hussain
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Statistical and Nonlinear Physics ,Condensed Matter Physics - Abstract
In this paper, we will define a new metric space called n-gonal graphical b-metric space. We will also prove some fixed point theorems in said metric space and give suitable examples to illustrate our results. These results will help to solve many nonlinear convex models in machine learning and optimization by formulating them in fixed point schemes of optimization. Our paper opens the door for researchers to work in the intersecting area of machine learning and functional analysis in the frame work of [Formula: see text]-gonal graphical [Formula: see text]-metric space.
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- 2022
22. Analysis of Cattaneo–Christov heat flux in Jeffery fluid flow with heat source over a stretching cylinder
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Zakir Hussain, Muhammad Farooq, Muhammad Shoaib Anwar, and Ashraf Hussain
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Drag coefficient ,Materials science ,02 engineering and technology ,Mechanics ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Stagnation point ,01 natural sciences ,010406 physical chemistry ,0104 chemical sciences ,Deborah number ,Physics::Fluid Dynamics ,Boundary layer ,Heat flux ,Parasitic drag ,Fluid dynamics ,Cylinder ,Physical and Theoretical Chemistry ,0210 nano-technology - Abstract
This analysis explores stagnation point in Jeffery liquid flow over a stretchable cylinder. Heat and mass transfer are investigated through Cattaneo–Christov model with double stratification, heat source and thermal relaxation. Moreover, the flow of liquid is caused by stretchable cylinder. Cylindrical coordinates are used for mathematical formulations. The acquired boundary layer problems for stretchable cylinder are dealt through homotopy analysis method. Results of variables appeared in governing equations are disclosed through graphs for flow, temperature, concentration and skin friction. The findings of the study show that higher values of ratio parameter and Deborah number in terms of relaxation time reduce magnitude of drag coefficient while reverse trend is noted for larger Deborah number in terms of retardation time and curvature parameter. Comparison of present work with previous published date is presented.
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- 2021
23. MHD Maxwell flow modeled by fractional derivatives with chemical reaction and thermal radiation
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Bilal Jamil, Amer Rasheed, Muhammad Shoaib Anwar, and Muhammad Irfan
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Physics ,Prandtl number ,Finite difference ,General Physics and Astronomy ,Reynolds number ,Mechanics ,01 natural sciences ,010305 fluids & plasmas ,Magnetic field ,Fractional calculus ,Physics::Fluid Dynamics ,symbols.namesake ,0103 physical sciences ,Heat transfer ,symbols ,Boussinesq approximation (water waves) ,Magnetohydrodynamics ,010306 general physics - Abstract
Heat transfer in a time-dependent flow of incompressible viscoelastic Maxwell fluid induced by a stretching surface has been investigated under the effects of heat radiation and chemical reaction. The magnetic field is applied perpendicular to the direction of flow. Velocity, temperature, and concentration are functions of z and t for the modeled boundary-layer flow problem. To have a hereditary effect, the time-fractional Caputo derivative is incorporated. The pressure gradient is assumed to be zero. The governing equations are non-linear, coupled and Boussinesq approximation is assumed for the formulation of the momentum equation. To solve the derived model numerically, the spatial variables are discretized by employing the finite element method and the Caputo-time derivatives are approximated using finite difference approximations. It reveals that the fractional derivative strengthens the flow field. We also observe that the magnetic field and relaxation time suppress the velocity. The lower Reynolds number enhances the viscosity and thus motion weakens slowly. The velocity initially decreases with increasing unsteadiness parameter δ. Temperature is an increasing function of heat radiation parameter but a decreasing one for the volumetric heat absorption parameter. The increasing value of the chemical reaction parameter decreases concentration. The Prandtl and Schmidt numbers adversely affect the temperature and concentration profiles respectively. The fractional parameter changes completely the velocity profiles. The Maxwell fluids modeled by the fractional differential equations flow faster than the ordinary fluid at small values of the time t but become slower for large values of the time t.
- Published
- 2020
24. Energy Transport and Effectiveness of Thermo-Sloutal Time’s Relaxation Theory in Carreau Fluid with Variable Mass Diffusivity
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Muhammad Irfan, Muhammad Shoaib Anwar, Humara Sardar, Masood Khan, and Waqar Azeem Khan
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Article Subject ,General Mathematics ,General Engineering - Abstract
Two different frames’ temperature creates thermal transport that gives advantage in energy fabrication in the power sector, burning in microscopic devices, and for remedy transport through heat transfer in materials. Here the article scrutinizes the transport of head utilizing the thermo-sloutal time’s relaxation, and aspects of non-Fick’s flux with variable conductivity and mass diffusivity in Carreau fluid have been elaborated. The magnetic aspect is also examined in a bidirectional stretched surface. The numerical procedure of ODEs via bvp4c method has been aimed at the solutions of influential parameters. The portrayal of influential factors is also presented. The intensifying behavior has been noted on concentration and temperature scattering when inconsistent thermal conductivity and variable mass diffusivity boost up. Furthermore, the temperature and concentration relaxation times are incorporated for the better understanding of the flow problem. The assessments of current article with former literature are also presented for the endorsement of outcomes.
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- 2022
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25. Arrhenius activation energy aspects in mixed convection Carreau nanofluid with nonlinear thermal radiation
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Muhammad Waqas, Waqar Azeem Khan, Madiha Rashid, M. Irfan, and Muhammad Shoaib Anwar
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Arrhenius equation ,Materials science ,Materials Science (miscellaneous) ,Transport coefficient ,02 engineering and technology ,Cell Biology ,Mechanics ,Activation energy ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Thermophoresis ,0104 chemical sciences ,Physics::Fluid Dynamics ,symbols.namesake ,Nanofluid ,Thermal radiation ,Combined forced and natural convection ,Thermal ,symbols ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,0210 nano-technology ,Biotechnology - Abstract
This exertion is part of a liable approach for the advancement of nanotechnology and nanoscience to scrutinize the thermal and rheological aspects of the nanofluids. The conformist heat transport fluids are broadly reported to be one of the notable reasons of the reduced enactment of heat transport tools, boosting the energy charges. For this concern to be stable, nanofluids have been familiarized as probable proxies to the conformist fluids because of their intensify aptitude of heat transport coefficient. Here, the up-front goal is to investigate the aspect of nonlinear radiated and chemical reaction with aspects of Arrhenius activation energy in Carreau nanofluid. Additionally, mixed convection, MHD, and new mass flux theory is explored. The framed system is envisioned numerically via bvp4c. Temperature field intensifies against enhanced values of radiation and thermophoresis parameters, respectively. Concentration has conflicted performance for escalating activation energy and Brownian motion parameters, respectively.
- Published
- 2020
26. Evaluating the performance of new mass flux theory on Carreau nanofluid using the thermal aspects of convective heat transport
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Waqar Azeem Khan, K. Rafiq, Masood Khan, Kaleem Iqbal, Muhammad Irfan, and Muhammad Shoaib Anwar
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Physics::Fluid Dynamics ,Convection ,Mass flux ,Nanofluid ,Materials science ,Convective heat transfer ,Combined forced and natural convection ,Thermal ,General Physics and Astronomy ,Mechanics ,Magneto ,Thermophoresis - Abstract
Nanofluids can be engineered as per requirements and have applications in microelectronic, therapeutic activities, hybrid-mechanical machineries, aeronautics zones, thermonuclear storehouses, shielding of miscellaneous engines etc. Here, the aspects of new mass flux theory in magneto Carreau nanofluid with convective and variable connectivity have been studied. Additionally, nonlinear properties of mixed convection are examined. The shear thinning–thickening properties are analysed by utilising bvp4c algorithm for influential variables. The fluid temperature increases with thermophoresis and variable conductivity parameters. The outcomes of thermophoresis and Brownian motion parameters have conflicting influences on concentration field.
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- 2021
27. Mixed convective flow of CNTs nanofluid subject to varying viscosity and reactions
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Ahmed Alsaedi, Tasawar Hayat, Muhammad Shoaib Anwar, and Zakir Hussain
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Multidisciplinary ,Materials science ,Science ,Diffusion ,Carbon nanotubes and fullerenes ,Thermodynamics ,Article ,Physics::Fluid Dynamics ,Base (group theory) ,Viscosity ,Nanofluid ,Combined forced and natural convection ,Heat generation ,Heat transfer ,Medicine ,Nanoparticles ,Absorption (logic) - Abstract
The addressed work explains SWCNTs (Single walled carbon nanotubnes) and MWCNTs (Multi walled carbon nanotubnes) nanofluid flow under the influences of temperature dependent viscosity and mixed convection. Comparative study of SWCNTs and MWCNTs suspended in base liquid is presented. Further heat and mass transfer are addressed for nanofluid effected by radiation, heat generation/absorption and diffusion species. Mathematical development of problem is taken in cylindrical coordinates. System of highly nonlinear differential equations are constructed via appropriate transformations. The system of equations are tackled numerically by bvp4c MATLAB solver. The findings of the study show that larger volume fraction $$\left( \phi \right)$$ ϕ contributes to enhance the nanoliquid flow. The velocity by submerging MWCNTs is noted higher than SWCNTs. Furthermore, the relationship between the viscosity variable $$\left( \theta _{r}\right)$$ θ r and the temperature is such that the temperature near the surface decreases with increase in $$\left( \theta _{r}\right)$$ θ r , while at the same time the temperature away from the surface increases. Subsequently, higher temperature is observed in SWCNTs-liquid compared to the MWCNTs-liquid to the similar values of $$\left( \theta _{r}\right)$$ θ r . Further, heat transfer is an increasing function of varying viscosity variable $$\left( \theta _{r}\right)$$ θ r .
- Published
- 2021
28. Eyring-Powell model flow near a convectively heated porous wedge with chemical reaction effects
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Majid Hussain, Qasim A. Ranjha, Muhammad Shoaib Anwar, Shah Jahan, and Akhtar Ali
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General Chemical Engineering ,General Chemistry - Published
- 2022
29. Mixed convection flow of viscoelastic fluid by a stretching cylinder with heat transfer.
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Tasawar Hayat, Muhammad Shoaib Anwar, Muhammad Farooq, and Ahmad Alsaedi
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Medicine ,Science - Abstract
Flow of viscoelastic fluid due to an impermeable stretching cylinder is discussed. Effects of mixed convection and variable thermal conductivity are present. Thermal conductivity is taken temperature dependent. Nonlinear partial differential system is reduced into the nonlinear ordinary differential system. Resulting nonlinear system is computed for the convergent series solutions. Numerical values of skin friction coefficient and Nusselt number are computed and discussed. The results obtained with the current method are in agreement with previous studies using other methods as well as theoretical ideas. Physical interpretation reflecting the contribution of influential parameters in the present flow is presented. It is hoped that present study serves as a stimulus for modeling further stretching flows especially in polymeric and paper production processes.
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- 2015
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30. CyberKnife Ablation of a Solitary Para-Aortic Lymph Node Metastasis After Robotic-Assisted Radical Prostatectomy
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Faith Hirri, Muhammad Shoaib Anwar Bajwa, Muhammad Arshad Irshad Khalil, and Naveed Afzal
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medicine.medical_specialty ,Para-aortic lymph node ,Robotic assisted ,business.industry ,Prostatectomy ,medicine.medical_treatment ,Cancer ,Ablation ,medicine.disease ,Metastasis ,Cyberknife ,medicine ,Radiology ,business - Published
- 2020
31. Interplay of chemical reacting species in a fractional viscoelastic fluid flow
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Muhammad Shoaib Anwar and Amer Rasheed
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Chemical process ,Partial differential equation ,Materials science ,Discretization ,Finite difference ,02 engineering and technology ,Mechanics ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Viscoelasticity ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Physics::Fluid Dynamics ,Nonlinear system ,Chemical species ,Flow (mathematics) ,Materials Chemistry ,Physical and Theoretical Chemistry ,0210 nano-technology ,Spectroscopy - Abstract
Fractional MHD viscoelastic fluid flow has been discussed in this study. Two dimensional and two directional unsteady flow field is more critically analyzed via non-integer time derivatives. Three memory parameters are incorporated to explore the viscoelastic characteristics of the model. Variations in concentration occurred due to homogeneous-heterogeneous reactions in the flow domain. Change in concentrations consequently leads to one of the lasting chemical species. Heterogeneous reactions are observed at the boundary while homogeneous reactions are seen in the flowing region. We consider different orders of diffusion coefficients of chemical reacting species to tackle the wider class of physical and chemical processes. Governing equations are nonlinear in nature. Hence a recently established finite difference technique along with “L1 algorithm” is used for discretization and solution of governing fractional partial differential equations. Presence of chemical reactions in flow process made the simulations valuable for chemical industry.
- Published
- 2019
32. Numerical computations of fractional nonlinear Hartmann flow with revised heat flux model
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Muhammad Shoaib Anwar and Amer Rasheed
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Discretization ,Differential equation ,Finite difference ,02 engineering and technology ,Mechanics ,021001 nanoscience & nanotechnology ,01 natural sciences ,Nusselt number ,Finite element method ,010305 fluids & plasmas ,Physics::Fluid Dynamics ,Computational Mathematics ,Computational Theory and Mathematics ,Heat flux ,Flow (mathematics) ,Modeling and Simulation ,0103 physical sciences ,Heat transfer ,0210 nano-technology ,Mathematics - Abstract
In this communication we have examined the magneto-hydrodynamic flow of viscoelastic liquid with revise version of thermal flux. Thermal conductivity of the fluid is variable. Effects of body forces such as gravity are also examined in terms of convection. Non-integer time derivatives are used for the better understanding of viscoelastic flow characteristics. In literature, these derivatives have been proved suitable for the predictions of hereditary systems such as viscoelastic flows. Heat transfer is analyzed in the flow field via modified fractional thermal gradient. Temperature gradient exists between the flow boundaries and increases with the passage of time. Flow is generated by the variable movement of flow boundary. All the segments of numerical modeling are completely addressed in this paper i.e. physical system, mathematical model, simulation, prediction, validation and verification. Unsteady motion of in-compressible fluid is directed by differential equations with fractional partial derivatives, for the solutions of these equations numerical techniques are necessary to use. Governing equations with appropriate flow conditions have been discretized by finite difference along with finite element algorithms. Theoretical error appraisals are hypothesized and created numerical plan has been approved by doing error investigations numerically regarding spatial directions. We have shown the estimate error and plotted the error curves in logarithmic scales of L 2 ( Ω ) and H 1 ( Ω ) norms by taking absolute approximations of the space discretization. Local Nusselt number and coefficients of skin friction are determined for non-integer viscoelastic model. Flow field is simulated for various values of physical parameters. The obtained results showed that fractional exponent α has opposite effects on the velocity, temperature profiles for time t = 2 . It is also noted that temperature gradient increases by the increase of fractional number α and thermal relaxation parameter γ . Viscoelastic flows in polymer and plastics industries can be addressed by similar technique.
- Published
- 2018
33. A microscopic study of MHD fractional inertial flow through Forchheimer medium
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Muhammad Shoaib Anwar and Amer Rasheed
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Physics ,Work (thermodynamics) ,Inertial frame of reference ,General Physics and Astronomy ,02 engineering and technology ,Mechanics ,021001 nanoscience & nanotechnology ,01 natural sciences ,Finite element method ,010305 fluids & plasmas ,Fractional calculus ,Physics::Fluid Dynamics ,Classical mechanics ,Flow (mathematics) ,Parasitic drag ,0103 physical sciences ,Magnetohydrodynamics ,0210 nano-technology ,Porous medium - Abstract
This article presents unsteady, magneto-hydrodynamic (MHD) flow of viscoelastic fluid through porous medium. Constitutive relationship for this model is established by fractional calculus approach. Flow is considered between two parallel plates of infinite length. Finite element-finite difference scheme is used for the solution of the governing nonlinear partial differential equation. Influence of the fractional flow parameters on the velocity profile and skin friction coefficient is shown by graphical illustrations. Numerical values are also computed for the skin friction coefficient. It is expected that present work helps as a motivation for modeling further porous medium flows that involve catalytic converters, gas turbines and condensers.
- Published
- 2017
34. Porosity features and gas permeability analysis of bi-modal porous alumina and mullite for filtration applications
- Author
-
Jae Kim, Fahad Ali, Hasan Bin Awais, In-Hyuck Song, Muhammad Shoaib Anwar, Syed Zaighum Abbas, Mazhar Mehmood, Syed Ahmad Ali, Rizwan Ahmad, and Jamil Ahmad
- Subjects
010302 applied physics ,Materials science ,Capillary action ,Process Chemistry and Technology ,Sintering ,Mullite ,02 engineering and technology ,Porosimetry ,Permeation ,021001 nanoscience & nanotechnology ,01 natural sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,law.invention ,Permeability (earth sciences) ,Magazine ,law ,0103 physical sciences ,Materials Chemistry ,Ceramics and Composites ,Composite material ,0210 nano-technology ,Porosity - Abstract
Bimodal porous structures were prepared by combining conventional sacrificial template and partial sintering methods. These porous structures were analysed by comparing pore characteristics and gas permeation properties of alumina/mullite specimens sintered at different temperatures. The pore characteristics were investigated by SEM, mercury porosimetry, and capillary flow porosimetry. A bimodal pore structure was observed. One type of pore was induced by starch, which acted as a sacrificial template. The other pore type was due to partial sintering. The pores produced by starch were between 2 and 10 µm whereas those produced by partial sintering exhibited pore size of 0.1–0.5 µm. The effects of sintering temperature on porosity, gas permeability, and mullite phase formation were studied. The formation of the mullite phase was confirmed by XRD. Compressive strengths of 37.9 MPa and 12.4 MPa with porosities of 65.3% and 70% were achieved in alumina and mullite specimens sintered at 1600 °C.
- Published
- 2016
35. Joule heating in magnetic resistive flow with fractional Cattaneo–Maxwell model
- Author
-
Muhammad Shoaib Anwar and Amer Rasheed
- Subjects
Physics ,Resistive touchscreen ,Mechanical Engineering ,Applied Mathematics ,General Engineering ,Aerospace Engineering ,02 engineering and technology ,Mechanics ,Microscopic description ,021001 nanoscience & nanotechnology ,01 natural sciences ,Industrial and Manufacturing Engineering ,Electromagnetic casting ,010305 fluids & plasmas ,Magnetic field ,Nonlinear system ,0103 physical sciences ,Automotive Engineering ,Thermal ,Magnetohydrodynamics ,0210 nano-technology ,Joule heating - Abstract
Influence of electric and magnetic fields in a nonlinear viscoelastic flow is studied in this communication. Microscopic description of Joule heating can be seen with the proposed model. Fractional formulation of the problem with Cattaneo–Maxwell model leads to oscillation and relaxation processes that show memory and delay of thermal and diffusing flux. Abrupt change in temperature and concentration in MHD flow can be controlled with this formalism. Time-dependent flow is governed by highly nonlinear fractional differential equations. Finite-element–finite-difference algorithm is used to solve the fractional coupled fields and flow dynamics problem. Remarkable physical parameters are calculated to signify the importance of problem under observation. Modeled problem can be tackled in numerous ways to obtain accurate simulations in polymer and electromagnetic casting industries.
- Published
- 2018
36. Fractional calculus approach for the phase dynamics of Josephson junction
- Author
-
Muhammad Irfan, Amer Rasheed, Muhammad Shoaib Anwar, Imtiaz Ali, and Zakir Hussain
- Subjects
Superconductivity ,Josephson effect ,Physics ,Partial differential equation ,General Mathematics ,Applied Mathematics ,Mathematical analysis ,General Physics and Astronomy ,Statistical and Nonlinear Physics ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,01 natural sciences ,Finite element method ,010305 fluids & plasmas ,Fractional calculus ,Magnetic field ,Condensed Matter::Superconductivity ,0103 physical sciences ,010301 acoustics ,Voltage ,Long Josephson junction - Abstract
This article presents the phase dynamics of an inline long Josephson junction in voltage state under the influence of constant external magnetic field. Fractional calculus approach is used to model the evolution of the phase difference between the macroscopic wave functions of the two superconductors across the junction. The governing non-linear partial differential equation is then solved using finite difference-finite element schemes. Other quantities of interest like Josephson current density and voltage across the junction are also computed. The effects of various parameters in the model on phase difference,Josephson current density and voltage are analyzed graphically with the help of numerical simulations.
- Published
- 2021
37. Modelling charge carrier transport with anomalous diffusion and heat conduction in amorphous semiconductors using fractional calculus
- Author
-
Mahnoor Khan, Muhammad Shoaib Anwar, Zakir Hussain, Tahir Shahzad, and Amer Rasheed
- Subjects
Amorphous semiconductors ,Materials science ,Condensed matter physics ,Anomalous diffusion ,Finite difference method ,Charge carrier ,Condensed Matter Physics ,Thermal conduction ,Mathematical Physics ,Atomic and Molecular Physics, and Optics ,Fractional calculus - Abstract
An ordered semiconductor has a crystalline lattice in which charge carriers move around by the Gaussian process of normal diffusion. The mean square displacement (MSD) of these charge carriers is proportional to time. On the contrary, the movement of carriers in a material with a non-crystalline structure such as amorphous semiconductors is considered to be non-Gaussian in nature. In this case, MSD is proportional to some power of time. Diffusion in this type of transport mechanism is classified as anomalous diffusion. The usual drift-diffusion equation (DDE) cannot adequately describe this process because it has non-Gaussian and dispersive transport mechanisms. Fractional calculus has been used to generalize the standard DDE to a time fractional equation in order to include the hereditary effects of the carrier transport. For power devices, the distribution and conduction of heat is the primary criteria considered when making a device. Therefore, an equation for heat conduction is added to the model for inclusion of variable temperature. The coupled system is solved using a Numerical scheme wherein Finite Difference method has been employed to discretize the Riemann - Liouville time derivative of order α and the space variable. The effects of different physical factors such as light intensity, heat and applied electric field are discussed with the help of graphical illustrations.
- Published
- 2021
38. Arrhenius activation energy theory in radiative flow of Maxwell nanofluid
- Author
-
M. Khan, K. Rafiq, W. A. Khan, M. Irfan, and Muhammad Shoaib Anwar
- Subjects
Arrhenius equation ,Materials science ,Thermodynamics ,Activation energy ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Physics::Fluid Dynamics ,symbols.namesake ,Nanofluid ,Flow (mathematics) ,Radiative transfer ,symbols ,Radiative heat flux ,Mathematical Physics - Abstract
Recently, nanofluids are habitually proficient to provide a process to intensify the probable heat transport of a structure with quite rare harmful influences formed by its addition. The usage of nanofluids and their optimum attentions has develop a range of prodigious concern with diverse nanofluid applications existence key to a structures attainment or interruption. Here the phenomena of activation energy and radiation in chemically reactive stagnation point Maxwell nanofluid have been elaborated. The magnetic properties with the influence of chemical reaction is also explored. The thermophoretic and Brownian dispersal are incorporated by utilizing the theory of Buongiorno model. The suitable conversions yield PDEs into ODEs. The facets of momentous parameters are examined via homotopic algorithm. The Brownian motion factor reports conflicting impact on temperature and concentration fields, respectively. The concentration field enhances for activation energy factor and decays for fitted rate constant. The Nusselt number decays for higher thermophoretic and Brownian factors.
- Published
- 2021
39. Theoretical analysis of new mass flux theory and Arrhenius activation energy in Carreau nanofluid with magnetic influence
- Author
-
K. Rafiq, Muhammad Waqas, Muhammad Shoaib Anwar, M. Khan, and M. Irfan
- Subjects
Convection ,Arrhenius equation ,Mass flux ,Materials science ,Biot number ,Field (physics) ,020209 energy ,General Chemical Engineering ,Prandtl number ,02 engineering and technology ,Activation energy ,Mechanics ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,010406 physical chemistry ,0104 chemical sciences ,symbols.namesake ,Nanofluid ,0202 electrical engineering, electronic engineering, information engineering ,symbols - Abstract
In the arena of pharmaceutical, nanotechnology and nanoscience numerous scientists are fascinated to explore the notion of nanofluid because nanofluids are two-phase ingredients comprising of disreputable fluid and nanoparticles which have notable possessions of heat transportation. Nanofluids are of boundless worth due to the higher enactment on progress of thermal act. This exertion sightsee the thought of new mass flux and activation energy in magnetized transient Carreau nanofluid with variable conductivity. The convective phenomenon, heat sink-source and chemical reaction are also scrutinized. The bvp4c algorithm exploited for solutions of ODEs. The outcomes of influential parameters are sketched graphically and in tabular shape. The temperature field escalates for Biot number and falloff for Prandtl number. The thermophoretic and activation energy parameters have analogous influence on concentration scattering and intensify the concentration field. Furthermore, the comparative fallouts are acknowledged and attained outstanding agreement.
- Published
- 2021
40. Numerical study of transport phenomena in a nanofluid using fractional relaxation times in Buongiorno model
- Author
-
Muhammad Shoaib Anwar
- Subjects
Convection ,Body force ,Physics ,Buoyancy ,Mechanics ,engineering.material ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Viscoelasticity ,Finite element method ,010305 fluids & plasmas ,Fractional calculus ,Nonlinear system ,0103 physical sciences ,engineering ,010306 general physics ,Transport phenomena ,Mathematical Physics - Abstract
Convective phenomena in a nanofluid flow under the influence of gravitational and magnetic body forces is analyzed in this communication. Nanofluid is of viscoelastic nature that preserves viscosity as well as elasticity. In order to capture the more realistic behavior of the convective phenomena Caputo fractional derivative and fractional relaxation time are introduced in the Buongiorno nanofluid model. Fractional derivative and relaxation time are used for controlled flow mechanism and to overcome infinite propagation speed for the temperature and concentration. The proposed model will also help to understand the hereditary and memory properties of the viscoelastic nanofluid. In order to more closely analyze the buoyancy forces nonlinear convection is introduced in the mathematical modeling of the flow problem. Finite difference-finite element numerical computations are carried out for the governing nonlinear partial differential equations. Quantities of physical interest are computed and discussed for the fractional model. The proposed fractional model can be used to realistically simulate various flow problems in polymer and chemical industries.
- Published
- 2020
41. Heat transfer at microscopic level in a MHD fractional inertial flow confined between non-isothermal boundaries
- Author
-
Muhammad Shoaib Anwar and Amer Rasheed
- Subjects
Physics ,Discretization ,General Physics and Astronomy ,02 engineering and technology ,Mechanics ,021001 nanoscience & nanotechnology ,01 natural sciences ,Nusselt number ,010305 fluids & plasmas ,Fractional calculus ,Physics::Fluid Dynamics ,Boundary layer ,Classical mechanics ,Flow (mathematics) ,0103 physical sciences ,Heat transfer ,Fluid dynamics ,Boundary value problem ,0210 nano-technology - Abstract
Heat transfer through a Forchheimer medium in an unsteady magnetohydrodynamic (MHD) developed differential-type fluid flow is analyzed numerically in this study. The boundary layer flow is modeled with the help of the fractional calculus approach. The fluid is confined between infinite parallel plates and flows by motion of the plates in their own plane. Both the plates have variable surface temperature. Governing partial differential equations with appropriate initial and boundary conditions are solved by employing a finite-difference scheme to discretize the fractional time derivative and finite-element discretization for spatial variables. Coefficients of skin friction and local Nusselt numbers are computed for the fractional model. The flow behavior is presented for various values of the involved parameters. The influence of different dimensionless numbers on skin friction and Nusselt number is discussed by tabular results. Forchheimer medium flows that involve catalytic converters and gas turbines can be modeled in a similar manner.
- Published
- 2017
42. MHD Stagnation Point Flow of Second Grade Fluid over a Stretching Cylinder with Heat and Mass Transfer
- Author
-
A. Alsaedi, Muhammad Farooq, T. Hayat, and Muhammad Shoaib Anwar
- Subjects
Stagnation temperature ,Applied Mathematics ,Computational Mechanics ,General Physics and Astronomy ,Statistical and Nonlinear Physics ,Mechanics ,Stagnation point ,Stagnation point flow ,Mechanics of Materials ,Modeling and Simulation ,Mass transfer ,Cylinder ,Magnetohydrodynamics ,Joule heating ,Stagnation pressure ,Engineering (miscellaneous) - Abstract
This paper presents magnetohydrodynamic (MHD) stagnation point flow of second grade fluid over a permeable stretching cylinder. Analysis has been carried out with heat and mass transfer. Viscous dissipation and Joule heating effects are also investigated. Suitable transformations are used to convert non-linear partial differential equations into the non-linear ordinary differential equations. Variation of different parameters on the velocity, temperature and concentration profiles are shown graphically. Numerical values of skin friction coefficient, Nusselt number and Sherwood number are computed. Comparison of f″(0), −θ′(0) and −c′(0) with the previous results are also examined.
- Published
- 2014
43. Effect of Dietary Supplementation of Aloe vera Leaves on Growth Performance and Immunity of Fayoumi Chicks
- Author
-
Jamila Shafi, Sohail Hassan Khan, Syeda Surriya Gilani, Farooq Hassan, Muhammad Jameel Ahma Khan, Salma Naz, Mehdi Hassan, and Muhammad Shoaib Anwar
- Subjects
Nutrition and Dietetics ,biology ,Public Health, Environmental and Occupational Health ,biology.organism_classification ,Body weight ,Feed conversion ratio ,Aloe vera ,Animal science ,Food supplement ,Immunity ,hemic and lymphatic diseases ,Botany ,Dietary supplementation ,Completely randomized design ,Food Science - Abstract
A total of 1800 Fayoumi chicks, 28 day-old of age, were used in this study to determine the effects of two levels of Aloe vera leaves on performance and immune parameters. Basal Fayoumi’s diet supplementation with 0, 1.0 or 2.0% Aloe vera leaves was investigated. The chicks were randomly divided into 9 separate floor pens each comprising 200 chicks and three pens (replicates) per treatment group in a completely randomized design. At the end of study, birds fed diets supplemented with 1.0 or 2.0% Aloe vera leaves had greater body weight gain, better feed intake and feed efficiency than those fed diets without Aloe vera leaves. Low morality was recorded in treatment groups. The geometric means HI titres of birds fed on diets containing Aloe vera leaves were higher than those fed on control. Aloe vera leaves included in the Fayoumi’s diet upto 1.0 or 2.0% did not have any deleterious effects on their performance and immunity.
- Published
- 2014
44. Leiomyoma of the Ureter : A Conservative Approach
- Author
-
Ziauddin Khan, Muhammad Shoaib Anwar Bajwa, Shehab Khashaba, and Tanweer Bhatty
- Subjects
medicine.medical_specialty ,business.industry ,medicine.medical_treatment ,media_common.quotation_subject ,CT Abdomen ,General Medicine ,Bladder Leiomyoma ,urologic and male genital diseases ,medicine.disease ,Urination ,female genital diseases and pregnancy complications ,Surgery ,surgical procedures, operative ,Leiomyoma ,Ureter ,medicine.anatomical_structure ,medicine ,Histopathology ,business ,Ureteric stent ,Hydronephrosis ,media_common - Abstract
We present a case of bladder leiomyoma and concurrent left lower ureteric leiomyoma in a sixty-two year old Bahraini male without any other comorbid conditions. He had infrequent hematuria for the last two years; it was associated with burning and discomfort during urination, frequency and urgency. Urine culture did not reveal any growth. Contrast CT abdomen revealed a mass in the bladder and lower ureteral narrowing with hydronephrosis. Histopathology of both lesions revealed leiomyoma. Limited resection with subsequent stenting saved patient from having major surgery. The patient was followed up after removal of left ureteric stent. He had MAG3 (Mercapto Acetyl Triglycine) scan, which was satisfactory with no restriction to drainage.
- Published
- 2014
45. Measurement of the absolute total electron impact cross section on Cs atoms using a magnetooptical trap
- Author
-
S. T. Müller, J. R. Garbin, V. S. Bagnato, Muhammad Shoaib Anwar, Débora Marcondes Bastos Pereira Milori, Daniel Varela Magalhães, Mushtaq Ahmed, and A. Bebeachibuli
- Subjects
Condensed Matter::Quantum Gases ,Range (particle radiation) ,Materials science ,Energetic neutral atom ,Condensed Matter Physics ,Industrial and Manufacturing Engineering ,Atomic and Molecular Physics, and Optics ,Cross section (physics) ,Ultracold atom ,Laser cooling ,Cathode ray ,Physics::Atomic Physics ,Atomic physics ,Ground state ,Instrumentation ,Electron ionization - Abstract
Laser cooling and trapping of neutral atoms has been employed for the measurement of the total electron impact cross sections of the ground state 62S1/2 of 133Cs atoms in the energy range from 80 to 500 eV. The total electron impact cross sections of the cold Cs atoms in the MOT were measured by observing the decay of the MOT after the interaction with the electron beam, and were found to depend only on the electron flux and not on the total number of atoms in the MOT. We confirm and extend the existing data on these measurements.
- Published
- 2008
46. Wearable wideband exposimeter design for electromagnetic field exposure measurements
- Author
-
Yann Toutain, Adrián Sánchez, Serge Bories, David Dassonville, Muhammad Shoaib Anwar, and Yolanda Fernández
- Subjects
Electromagnetic field ,Engineering ,business.industry ,Electronic engineering ,Electrical engineering ,Wearable computer ,Wideband ,Exposure measurement ,business - Published
- 2014
47. System in-Package Solution with Dielectric resonator Antenna and Power Amplifier for a 60GHz High Data-Rate Transmitter
- Author
-
Muhammad, Shoaib Anwar, Guzman Velez, Juan Pablo, Ney, Michel, Person, Christian, Pilard, Romain, Kerherve, Eric, Demirel, Nejdat, Département Micro-Ondes (MO), Institut Mines-Télécom [Paris] (IMT)-Télécom Bretagne-Université européenne de Bretagne - European University of Brittany (UEB), Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC), École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Lab-STICC_TB_MOM_PIM, Université de Brest (UBO)-Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), Lab-STICC_TB_MOM_DIM, STMicroelectronics, Laboratoire de l'intégration, du matériau au système (IMS), Université Sciences et Technologies - Bordeaux 1-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Télécom Bretagne (devenu IMT Atlantique), Ex-Bibliothèque, and Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT)
- Subjects
Dielectric resonator ,Antenna ,Hardware_INTEGRATEDCIRCUITS ,System in Package ,[SPI.TRON] Engineering Sciences [physics]/Electronics ,[SPI.TRON]Engineering Sciences [physics]/Electronics - Abstract
International audience; Performance of a System in-Package (SiP) module is evaluated in this paper. The solution consists of a Dielectric Resonator Antenna (DRA) excited by a Power Amplifier (PA).The impact of the bond wire and the closed proximity of the PA element have been considered in the simulation for the co-design of this highly integrated sub-system. Experimental results show a total EIRP of 21 dBm measured for the PA/DRA configuration.
- Published
- 2013
48. Dielectric Resonator Antenna Inside a Package for Millimeter Wave Transmitter System
- Author
-
MUHAMMAD, Shoaib Anwar, GUZMAN VELEZ, Juan Pablo, Ney, Michel, Person, Christian, Pilard, Romain, Télécom Bretagne (devenu IMT Atlantique), Ex-Bibliothèque, Département Micro-Ondes (MO), Institut Mines-Télécom [Paris] (IMT)-Télécom Bretagne-Université européenne de Bretagne - European University of Brittany (UEB), Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC), École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Lab-STICC_TB_MOM_PIM, Université de Brest (UBO)-Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), Lab-STICC_TB_MOM_DIM, and STMicroelectronics
- Subjects
Dielectric resonator ,Package ,Hardware_GENERAL ,Antenna ,Millimeter wave ,Transmitter ,Quad Flat No leads ,System in Package ,[SPI.TRON] Engineering Sciences [physics]/Electronics ,[SPI.TRON]Engineering Sciences [physics]/Electronics - Abstract
International audience; A Dielectric Resonator Antenna (DRA) for a System in Package (SiP) millimeter wave transmitter is proposed. A commercially available Quad-Flat No-leads (QFN) package is chosen and the DRA is designed taking into account the package environment. The final design shows a 14% impedance bandwidth (56.5 GHz - 65 GHz @VSWR=2) with a maximum realized gain of 8 dBi. The package is considered as well as the different interconnections between the Si-chip and access pads, thus offering a SMD (Surface Mounted Device) antenna solution fulfilling the unlicensed 60 GHz band requirements for short range communications.
- Published
- 2013
49. Cylindrical Dielectric Resonator Antenna excited by on-chip integrated slot for a completely packaged 60 GHz front-end solution
- Author
-
GUZMAN VELEZ, Juan Pablo, MUHAMMAD, Shoaib Anwar, Ney, Michel, Person, Christian, Télécom Bretagne (devenu IMT Atlantique), Ex-Bibliothèque, Département Micro-Ondes (MO), Institut Mines-Télécom [Paris] (IMT)-Télécom Bretagne-Université européenne de Bretagne - European University of Brittany (UEB), Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC), École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Lab-STICC_TB_MOM_PIM, Université de Brest (UBO)-Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), and Lab-STICC_TB_MOM_DIM
- Subjects
[SPI.ELEC]Engineering Sciences [physics]/Electromagnetism ,Silicon ,[SPI.ELEC] Engineering Sciences [physics]/Electromagnetism ,Dielectric resonator antenna ,SiP integration ,Mmwave radio - Abstract
International audience; In this paper, a completely packaged solution is presented for high data rate radio front end operating around 60 GHz. A cylindrical dielectric resonator antenna is micromachined as a part of the package surrounding other active elements. This resonator is magnetically coupled to a nearby integrated coplanar-fed slotted dipole. Simulation results show a 6.1GHz impedance matching bandwidth (VSWR=2) with a gain greater than 5dBi throughout the entire bandwidth.
- Published
- 2012
50. Revisiting the capture velocity of a cesium magneto-optical trap: model, simulation and experiment
- Author
-
Daniel Varela Magalhães, Mushtaq Ahmed, S. T. Müller, Muhammad Salman Faisal, Muhammad Shoaib Anwar, and Muhammad Nawaz
- Subjects
Condensed Matter::Quantum Gases ,Physics ,Work (thermodynamics) ,Ab initio ,chemistry.chemical_element ,Condensed Matter Physics ,Laser ,ÓPTICA ,Industrial and Manufacturing Engineering ,Atomic and Molecular Physics, and Optics ,law.invention ,Trap (computing) ,chemistry ,law ,Caesium ,Magneto-optical trap ,Atom ,Physics::Atomic Physics ,Restoring force ,Atomic physics ,Instrumentation - Abstract
In this work, we have explored ab initio the capture process in a magneto-optical trap by theory, simulation and experiment. We measured the capture velocity vc of a cesium vapor cell magneto-optical trap (VCMOT) from its capture rate R and developed an exact model for the capture rate of a VCMOT in terms of its capture velocity, background density and trap laser beam diameter. We measured the capture velocity of a cesium VCMOT for various trap laser intensities and magnetic field gradients. We observed that the capture velocity is a damping force as well as a restoring force phenomenon. We supported our findings by performing simulations for single atom trajectories in a 1D cesium MOT. Finally, we concluded that two MOTs can have the same capture velocities but very different capture rates, thereby revealing that these are two fundamentally different characteristics of the MOT.
- Published
- 2014
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