Investigating the Radioactivity of the groundwater within the
Quaternary aquifer and its Environmental Impact: Dairut, Assiut,
Egypt

Research Abstract
NULL
Research Authors
Gh.S.M.Hassan, Hany El-Gamal, Ahmed Sefelnasr, M.Omer, A.I.Abd ElMageed
Research Department
Department of physics
Research Journal
Assiut Univ. J. of Physics
46(1), p-p11-22(2017)
Research Member
Mohamed Omer
Research Pages
NULL
Research Publisher
NULL
Research Rank
2
Research Vol
NULL
Research Website
NULL
Research Year
2017

Investigating the Radioactivity of the groundwater within the
Quaternary aquifer and its Environmental Impact: Dairut, Assiut,
Egypt

Research Abstract
NULL
Research Authors
Gh.S.M.Hassan, Hany El-Gamal, Ahmed Sefelnasr, M.Omer, A.I.Abd ElMageed
Research Department
Department of physics
Research Journal
Assiut Univ. J. of Physics
46(1), p-p11-22(2017)
Research Member
Ghada Salaheldin Mohamed Hassan
Research Pages
NULL
Research Publisher
NULL
Research Rank
2
Research Vol
NULL
Research Website
NULL
Research Year
2017

Nonlinear theory of a Cherenkov free-electron laser

Research Abstract
Plasma fluid and Maxwell equations are used to derive an analytical expression for the high-gain of a Cherenkov Free-Electron Laser (FEL). The evolution of the gain from the linear to the non-linear regime is investigated. The gain expression is then generalized to predict the linear and non-linear effects at any stage of interaction, permitting us to identify the criteria of optimal design of Cherenkov FELs. In this study, the spatial dependence of the characterizing parameters of electron beam velocity and density, such as the average value and modulation amplitude, are considered. Also, the phase shift between the bunched electrons and the radiation field is taken into account. In the linear limit, it is shown that our gain expression agrees satisfactorily with those obtained in previous studies.
Research Authors
Hesham Fares
Mohamed Mahmoud
Research Department
Department of physics
Research Journal
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Research Member
Mohamed Mahmoud Ali
Research Pages
1-7
Research Publisher
Hesham fares
Research Rank
1
Research Vol
976 - 164256
Research Website
https://www.sciencedirect.com/science/article/pii/S0168900220306525
Research Year
2020

Nonlinear theory of a Cherenkov free-electron laser

Research Abstract
Plasma fluid and Maxwell equations are used to derive an analytical expression for the high-gain of a Cherenkov Free-Electron Laser (FEL). The evolution of the gain from the linear to the non-linear regime is investigated. The gain expression is then generalized to predict the linear and non-linear effects at any stage of interaction, permitting us to identify the criteria of optimal design of Cherenkov FELs. In this study, the spatial dependence of the characterizing parameters of electron beam velocity and density, such as the average value and modulation amplitude, are considered. Also, the phase shift between the bunched electrons and the radiation field is taken into account. In the linear limit, it is shown that our gain expression agrees satisfactorily with those obtained in previous studies.
Research Authors
Hesham Fares
Mohamed Mahmoud
Research Department
Department of physics
Research Journal
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Research Member
Hesham Fares Ahmed Hassan
Research Pages
1-7
Research Publisher
Hesham fares
Research Rank
1
Research Vol
976 - 164256
Research Website
https://www.sciencedirect.com/science/article/pii/S0168900220306525
Research Year
2020

Magnetohydrodynamic Mixed Convection and Entropy Analysis of Nanofluid in Gamma-Shaped Porous
Cavity.

Research Abstract
Magnetohydrodynamic Mixed Convection and Entropy Analysis of Nanofluid in Gamma-Shaped Porous Cavity.
Research Authors
AJ.Chamkha,M.AMansour, AM.Rashad,H. Kargarsharifabad, TaherArmaghani
Research Department
Department of Mathematics
Research Journal
Journal of Thermophysics and Heat Transfer,
Research Member
Mohamed Ahmed Mansor Abd Allah
Research Pages
p. 1-12.
Research Publisher
NULL
Research Rank
1
Research Vol
NULL
Research Website
NULL
Research Year
2020

Inclined magneto: convection, internal heat, and entropy generation of nanofluid in an I-shaped cavity saturated with porous media.

Research Abstract
Inclined magneto: convection, internal heat, and entropy generation of nanofluid in an I-shaped cavity saturated with porous media
Research Authors
T Armaghani, A Chamkha, A.M. Rashad, M.A. Mansour
Research Department
Department of Mathematics
Research Journal
Journal of Thermal Analysis and Calorimetry,
Research Member
Mohamed Ahmed Mansor Abd Allah
Research Pages
p. 1-13.
Research Publisher
NULL
Research Rank
1
Research Vol
Research Website
NULL
Research Year
2020

Effect Of The Fractional Derivatives On Unsteady Natural Convection Of A Nanofluid In An Enclosure.

Research Abstract
Effect Of The Fractional Derivatives On Unsteady Natural Convection Of A Nanofluid In An Enclosure.
Research Authors
S.E. AHMED, M.A. MANSOUR, E. A-B. ABD-ELSALAM, E.F. MOHAMED,
Research Department
Department of Mathematics
Research Journal
Latin American Applied Research
Research Member
Mohamed Ahmed Mansor Abd Allah
Research Pages
p. 13-19.
Research Publisher
NULL
Research Rank
1
Research Vol
50(1):
Research Website
NULL
Research Year
2020

Effects of the Caputo fractional derivatives on convective flow in wavy vented enclosures filled with a porous medium using Al2O3Cu hybrid nanofluids.

Research Abstract
Effects of the Caputo fractional derivatives on convective flow in wavy vented enclosures filled with a porous medium using Al2O3Cu hybrid nanofluids.
Research Authors
Sameh E. Ahmed, Mohamed A. Mansour , Emad A.B. Abdel Salam , Eman F. Mohamed,
Research Department
Department of Mathematics
Research Journal
Heat Transfer
Research Member
Mohamed Ahmed Mansor Abd Allah
Research Pages
p. 1895-1919.
Research Publisher
NULL
Research Rank
1
Research Vol
49(4):
Research Website
NULL
Research Year
2020

, MHD mixed convection and entropy generation of nanofluid in a lid-driven U-shaped cavity with internal heat and partial slip

Research Abstract
MHD mixed convection and entropy generation of nanofluid in a lid-driven U-shaped cavity
Research Authors
AM Rashad, MA Mansour, T Armaghani, AJ Chamkha
Research Department
Department of Mathematics
Research Journal
.Physics of Fluids
Research Member
Mohamed Ahmed Mansor Abd Allah
Research Pages
p. 042006.
Research Publisher
NULL
Research Rank
1
Research Vol
31(4):
Research Website
NULL
Research Year
2019

Entropy generation and nanofluid mixed convection in a C-shaped cavity with heat corner and inclined magnetic field.

Research Abstract
Entropy generation and nanofluid mixed convection in a C-shaped cavity
Research Authors
MA Mansour, T Armaghani, AJ Chamkha, AM Rashad
Research Department
Department of Mathematics
Research Journal
The European Physical Journal Special Topics,
Research Member
Mohamed Ahmed Mansor Abd Allah
Research Pages
p. 2619-2645
Research Publisher
NULL
Research Rank
1
Research Vol
228(12):
Research Website
NULL
Research Year
2019
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