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In this study, the modified Green and Lindsay model is utilized to discuss the effects of heating caused by surface absorption of laser radiation in a two-dimensional thermoelastic half-space. The temporal profile of the pulsed laser is taken as a non-Gaussian and the spatial one is a Gaussian. The medium surface is taken to be traction free. The integral transform method is utilized to obtain the general solution by applying the two transformations Hankel and Laplace, in which the inverse of Laplace is performed numerically. The Silicon material is considered as an example to verify the consistency of the obtained results of the new model.
Ismail M. Tayel; Jawdat Alebraheem; Sadia Asad; A. El-Bary; Kh. Lotfy. Surface absorption illumination in a 2D thermoelastic semi-infinite medium under modified Green and Lindsay model. Alexandria Engineering Journal 2021, 1 .
AMA StyleIsmail M. Tayel, Jawdat Alebraheem, Sadia Asad, A. El-Bary, Kh. Lotfy. Surface absorption illumination in a 2D thermoelastic semi-infinite medium under modified Green and Lindsay model. Alexandria Engineering Journal. 2021; ():1.
Chicago/Turabian StyleIsmail M. Tayel; Jawdat Alebraheem; Sadia Asad; A. El-Bary; Kh. Lotfy. 2021. "Surface absorption illumination in a 2D thermoelastic semi-infinite medium under modified Green and Lindsay model." Alexandria Engineering Journal , no. : 1.
Electro-magnetic-thermal-microstretch elastic mathematical-physical model of semiconductor medium is investigated. The governing equations are studied in the context of photo-thermoelasticity theory during photothermal transport process. The semiconductor medium is exposed to an external magnetic field and a beam of laser. The coupled between electromagnetic field, thermal, elastic and plasma waves when the inertia-microstretch properties of elastic semiconductor material is taken into account. The main physical quantities are taken during two dimensions (2D) electronic-elastic deformation. The microinertia of microelement under the impact of external magnetic field is taken into consideration. The harmonic wave solutions in 2D with time variation is used to obtain the main physical fields. To obtain the complete solutions of the physical fields, some mechanical-thermal-elastic and plasma conditions for the semiconductor medium are taken at the boundary. The physical constants of the silicon (Si) material are used to make the numerical simulations and obtained the physical variables with the horizontal distance graphically. Many comparisons are made according to the thermal memories and the magnetic field influence.
Kh. Lotfy; A. A. El-Bary. Magneto-Photo-Thermo-Microstretch Semiconductor Elastic Medium Due to Photothermal Transport Process. Silicon 2021, 1 -13.
AMA StyleKh. Lotfy, A. A. El-Bary. Magneto-Photo-Thermo-Microstretch Semiconductor Elastic Medium Due to Photothermal Transport Process. Silicon. 2021; ():1-13.
Chicago/Turabian StyleKh. Lotfy; A. A. El-Bary. 2021. "Magneto-Photo-Thermo-Microstretch Semiconductor Elastic Medium Due to Photothermal Transport Process." Silicon , no. : 1-13.
The key aim of this paper is to construct a modified version of the SEIQR essential disease dynamics model for the COVID-19 emergence. The modified SEIQR pandemic model takes a groundbreaking approach to evaluate and monitor the COVID-19 epidemic. The complex studies presented in this paper are based on real-world data from Saudi Arabia. A reproduction number and a systematic stability analysis are included in the new version of SEIQR model dynamics. Using the Jacobian linearization process, we can obtain the domain of the solution and the state of equilibrium based on the modified SEIQR model. The equilibrium and its importance have been identified, and the disease-free stability of the equilibrium has been investigated. The reproduction number was calculated using internal metrics, and the global stability of the current model's equilibrium was demonstrated using Lyapunov's stability theorem. To see how well the SEIQR proposed model went, it was compared to real COVID-19 spread data in Saudi Arabia. According to the results, the new SEIQR proposed model is a good match for researching the spread of epidemics like COVID-19. In the end, we presented an optimal protocol to prevent the dissemination of COVID-19. Staying at home and transporting sick people as far as possible to a safe region is the most effective strategy to prevent COVID-19 spread. It is critical to offer infected people safe and effective treatment, as well as antibiotics and nutrients to non-affected people. To detect confirmed infections, we must provide more effective and reliable diagnostic methods. Furthermore, increasing understanding of how to recognize the disease, its symptoms, and how to confirm the infection.
Hamdy M. Youssef; Najat Alghamdi; Magdy A. Ezzat; Alaa A. El-Bary; Ahmed M. Shawky. A Proposed Modified SEIQR Epidemic Model to Analyze the COVID-19 Spreading in Saudi Arabia. Alexandria Engineering Journal 2021, 1 .
AMA StyleHamdy M. Youssef, Najat Alghamdi, Magdy A. Ezzat, Alaa A. El-Bary, Ahmed M. Shawky. A Proposed Modified SEIQR Epidemic Model to Analyze the COVID-19 Spreading in Saudi Arabia. Alexandria Engineering Journal. 2021; ():1.
Chicago/Turabian StyleHamdy M. Youssef; Najat Alghamdi; Magdy A. Ezzat; Alaa A. El-Bary; Ahmed M. Shawky. 2021. "A Proposed Modified SEIQR Epidemic Model to Analyze the COVID-19 Spreading in Saudi Arabia." Alexandria Engineering Journal , no. : 1.
In this work, the effect of rotation field can be studied during the modified Green and Lindsay model (MGL). The two dimensional (2D)elastic medium is exposed to thermal influences caused by surface absorption of (pulsed) laser radiation. In this case, The non- Gaussian temporal profile is used for the impact of the pulsed laser and the spatial one is a Gaussian. The two integral transformation Hankel and Laplace method are used with some surface conditions subjected to free traction to obtain the main fields. The complete general solution of the physical quantities are obtained using the inverse of Laplace transform numerically. With neglected the carrier density, the Silicon (Si) material is used as an elastic example medium to verify from the obtained results under the impact of rotation during the new (MGL) model.
M.S. Mohamed; Kh. Lotfy; A. El-Bary; A.M.S. Mahdy. Absorption illumination of a 2D rotator semi-infinite thermoelastic medium using a modified Green and Lindsay model. Case Studies in Thermal Engineering 2021, 26, 101165 .
AMA StyleM.S. Mohamed, Kh. Lotfy, A. El-Bary, A.M.S. Mahdy. Absorption illumination of a 2D rotator semi-infinite thermoelastic medium using a modified Green and Lindsay model. Case Studies in Thermal Engineering. 2021; 26 ():101165.
Chicago/Turabian StyleM.S. Mohamed; Kh. Lotfy; A. El-Bary; A.M.S. Mahdy. 2021. "Absorption illumination of a 2D rotator semi-infinite thermoelastic medium using a modified Green and Lindsay model." Case Studies in Thermal Engineering 26, no. : 101165.
A novel model in photo-thermoelasticity theory is investigated in the paper understudy. The model is obtained theoretically for a semiconductor elastic medium, which is in a rotation case. The interaction between main physical quantities during photothermal transport process is expressed in the governing equations. In addition, the numerical-refined multi-phase-lags relaxation times (thermal memories) are studied in the context of the heat equation when the medium is exposed to an external magnetic field. Moreover, the harmonic wave method in two-dimensional (2D) is introduced during the coupling processes between multi-waves. As such, the complete exact solutions of the main physical fields of semi-infinite semiconductor medium are obtained. Some plasma, mechanical and thermal forces are applied at the outer surface of the elastic medium to determine the unknown parameters. Many comparisons are displayed graphically when the physical constants of silicon (Si) material are used. Theoretical results are discussed under the impact of magnetic field and rotation field.
A. M. S. Mahdy; Kh. Lotfy; A. El-Bary; H. H. Sarhan. Effect of rotation and magnetic field on a numerical-refined heat conduction in a semiconductor medium during photo-excitation processes. The European Physical Journal Plus 2021, 136, 1 -17.
AMA StyleA. M. S. Mahdy, Kh. Lotfy, A. El-Bary, H. H. Sarhan. Effect of rotation and magnetic field on a numerical-refined heat conduction in a semiconductor medium during photo-excitation processes. The European Physical Journal Plus. 2021; 136 (5):1-17.
Chicago/Turabian StyleA. M. S. Mahdy; Kh. Lotfy; A. El-Bary; H. H. Sarhan. 2021. "Effect of rotation and magnetic field on a numerical-refined heat conduction in a semiconductor medium during photo-excitation processes." The European Physical Journal Plus 136, no. 5: 1-17.
Optimal power flow (OPF) is considered one of the most critical challenges that can substantially impact the sustainable performance of power systems. Solving the OPF problem reduces three essential items: operation costs, transmission losses, and voltage drops. An intelligent controller is needed to adjust the power system’s control parameters to solve this problem optimally. However, many constraints must be considered that make the design process of the OPF algorithm exceedingly tricky due to the increased number of limitations and control variables. This paper proposes a multi-objective intelligent control technique based on three different meta-heuristic optimization algorithms: multi-verse optimization (MVO), grasshopper optimization (GOA), and Harris hawks optimization (HHO) to solve the OPF problem. The proposed control techniques were validated by applying them to the IEEE-30 bus system under different operating conditions through MATLAB simulations. The proposed techniques were then compared with the particle swarm optimization (PSO) algorithm, which is very popular in the literature studying how to solving the OPF problem. The obtained results show that the proposed methods are more effective in solving the OPF problem when compared to the commonly used PSO algorithm. The proposed HHO, in particular, shows that it can form a reliable candidate in solving power systems’ optimization problems.
Hatem Diab; Mahmoud Abdelsalam; Alaa Abdelbary. A Multi-Objective Optimal Power Flow Control of Electrical Transmission Networks Using Intelligent Meta-Heuristic Optimization Techniques. Sustainability 2021, 13, 4979 .
AMA StyleHatem Diab, Mahmoud Abdelsalam, Alaa Abdelbary. A Multi-Objective Optimal Power Flow Control of Electrical Transmission Networks Using Intelligent Meta-Heuristic Optimization Techniques. Sustainability. 2021; 13 (9):4979.
Chicago/Turabian StyleHatem Diab; Mahmoud Abdelsalam; Alaa Abdelbary. 2021. "A Multi-Objective Optimal Power Flow Control of Electrical Transmission Networks Using Intelligent Meta-Heuristic Optimization Techniques." Sustainability 13, no. 9: 4979.
Cost management of microgrids represents a real challenge since the power generation of microgrids is usually composed of different renewable and non-renewable sources. Additionally, it is always desired to make a connection between the microgrid and national grid to secure the load demand and to fit the regulations of liberated energy markets. Because of all these reasons, it is essential to develop a smart energy management unit to control different energy resources within the microgrid to achieve minimum operation costs. This paper presents a proposal for a smart unit for the cost management and operation of multi-source based microgrids. The proposed unit utilizes the Harris hawk optimization (HHO) algorithm which is used to optimize the cost of operation based on current load demand, energy prices and generation capacities. The proposed unit is tested on a microgrid with different energy resources using MATLAB while applying different operation scenarios. All simulation results show that the proposed unit succeeds in operating the microgrid at minimum cost. Obtained results are compared with other optimization algorithms and the proposed Harris hawk algorithm gives superior performance.
Mahmoud Abdelsalam; Hatem Diab; A. El-Bary. A Metaheuristic Harris Hawk Optimization Approach for Coordinated Control of Energy Management in Distributed Generation Based Microgrids. Applied Sciences 2021, 11, 4085 .
AMA StyleMahmoud Abdelsalam, Hatem Diab, A. El-Bary. A Metaheuristic Harris Hawk Optimization Approach for Coordinated Control of Energy Management in Distributed Generation Based Microgrids. Applied Sciences. 2021; 11 (9):4085.
Chicago/Turabian StyleMahmoud Abdelsalam; Hatem Diab; A. El-Bary. 2021. "A Metaheuristic Harris Hawk Optimization Approach for Coordinated Control of Energy Management in Distributed Generation Based Microgrids." Applied Sciences 11, no. 9: 4085.
This article attempts to establish a mathematical epidemic model for the outbreak of the new COVID-19 coronavirus. A new consideration for evaluating and controlling the COVID-19 outbreak will be constructed based on the SEIQR Pandemic Model. In this paper, the real data of COVID-19 spread in Saudi Arabia has been used for the mathematical model and dynamic analyses. Including the new reproductive number and detailed stability analysis, the dynamics of the proposed SEIQR model have been applied. The local sensitivity of the reproduction number has been analyzed. The domain of solution and equilibrium based on the SEIQR model have been proved using a Jacobian linearization process. The state of equilibrium and its significance have been proved, and a study of the integrity of the disease-free equilibrium has been carried out. The Lyapunov stability theorem demonstrated the global stability of the current model equilibrium. The SEIQR model has been numerically validated and projected by contrasting the results from the SEIQR model with the actual COVID-19 spread data in Saudi Arabia. The result of this paper shows that the SEIQR model is a model that is effective in analyzing epidemic spread, such as COVID-19. At the end of the study, we have implemented the protocol which helped the Saudi population to stop the spread of COVID-19 rapidly.
Hamdy Youssef; Najat Alghamdi; Magdy A. Ezzat; Alaa A. El-Bary; Ahmed M. Shawky. Study on the SEIQR model and applying the epidemiological rates of COVID-19 epidemic spread in Saudi Arabia. Infectious Disease Modelling 2021, 6, 678 -692.
AMA StyleHamdy Youssef, Najat Alghamdi, Magdy A. Ezzat, Alaa A. El-Bary, Ahmed M. Shawky. Study on the SEIQR model and applying the epidemiological rates of COVID-19 epidemic spread in Saudi Arabia. Infectious Disease Modelling. 2021; 6 ():678-692.
Chicago/Turabian StyleHamdy Youssef; Najat Alghamdi; Magdy A. Ezzat; Alaa A. El-Bary; Ahmed M. Shawky. 2021. "Study on the SEIQR model and applying the epidemiological rates of COVID-19 epidemic spread in Saudi Arabia." Infectious Disease Modelling 6, no. : 678-692.
In this work, the effect of hydrostatic initial stress is studied with the exited semiconductor material. Electrons are exited at the free surface of the elastic semiconductor medium using the photo-thermal-elastic theory during the transport (diffusion) process. The thermal memories are due to the dual-phase-lag (DPL) relaxation times of the heat conduction equation with a novel model. In this model, the thermal conductivity is chosen as a linear dependent function of the thermal temperature impact which is variable. The effect of gravitational field is taken into account during the two-dimensional (2D) elastic deformation under the impact of an internal heat source. The Kirchhoff transformation mapping is used. The harmonic wave (normal mode) method is applied for the 2D governing equations to obtain the main physical fields analytically. Some thermal and mechanical forces are applied with other elastic-plasma conditions at the free surface of the semiconductor material to get the complete solutions. Some comparisons used a novel parameters which depend on the DPL model and the differences in the thermal conductivity parameters and they are illustrated graphically and discussed.
A.M.S. Mahdy; Kh. Lotfy; A. A. El-Bary. Thermal conductivity changes of photo-elastic semiconductor excited in gravitational field with hydrostatic initial stress and internal heat source. Waves in Random and Complex Media 2021, 1 -20.
AMA StyleA.M.S. Mahdy, Kh. Lotfy, A. A. El-Bary. Thermal conductivity changes of photo-elastic semiconductor excited in gravitational field with hydrostatic initial stress and internal heat source. Waves in Random and Complex Media. 2021; ():1-20.
Chicago/Turabian StyleA.M.S. Mahdy; Kh. Lotfy; A. A. El-Bary. 2021. "Thermal conductivity changes of photo-elastic semiconductor excited in gravitational field with hydrostatic initial stress and internal heat source." Waves in Random and Complex Media , no. : 1-20.
The leading objective of this article is to investigate the analytical and numerical solutions of the Generalized Benjamin-Bona-Mahony (GBBM) equation. We also aim to compare the performance of the considered methods for solving this equation. The exact solution is obtained analytically while the numerical solutions are demonstrated using some techniques, namely, the adaptive moving mesh and uniform mesh methods. The exact solution is presented in a form of convergent power series. The finite differences are also applied to discretise the BBM equation. Under a suitable selection of parameters, some 2D and 3D surfaces for the obtained theoretical and numerical results are shown to compare the exact and numerical solutions.
M.B. Almatrafi; Abdulghani Alharbi; Kh. Lotfy; A.A. El-Bary. Exact and numerical solutions for the GBBM equation using an adaptive moving mesh method. Alexandria Engineering Journal 2021, 60, 4441 -4450.
AMA StyleM.B. Almatrafi, Abdulghani Alharbi, Kh. Lotfy, A.A. El-Bary. Exact and numerical solutions for the GBBM equation using an adaptive moving mesh method. Alexandria Engineering Journal. 2021; 60 (5):4441-4450.
Chicago/Turabian StyleM.B. Almatrafi; Abdulghani Alharbi; Kh. Lotfy; A.A. El-Bary. 2021. "Exact and numerical solutions for the GBBM equation using an adaptive moving mesh method." Alexandria Engineering Journal 60, no. 5: 4441-4450.
- In this manuscript, we work on the essential collocation technique via utilizing the shifted second Chebyshev polynomials type (SSCPT). The numeral technique for unraveling the nonlinear fractional Rubella ailment. The characteristic of the SSCPT is introduced. The dynamic system for this model is discussed. We proved the existence of a stable solution of the fractional model after and before control. The optimal control of this model and numerical technique for the simulation of the control problem is also discussed. The finite difference strategy has been utilized to fathom the arrangement of conditions. The numerical model is given to affirm the unwavering quality and adequacy of the suggested technique. The fad and importance of the results are clearing about the 3D plot. We are discussing free disease equilibrium, stability equilibrium point, and the existence of stable solution. It appears that the solutions acquired are novel and ability is helpful in analyzing the internal technique of other nonlinear biological models. Next applying the numerical technique, we are able to say that the outcomes we acquired are perfect, whether from an analytical or numerical point of view. Additionally, the numerical outcomes are completely consistent with the analytical outcomes. The numerical technique used in this manuscript to solve this model has not been utilized by any author before that. Also, this model with fractional derivatives defined in this way has not been studied before that. The techniques utilized are easy to effect, whether analytical or numerical and give good outcomes.
A.M.S. Mahdy; M.S. Mohamed; Kh. Lotfy; M. Alhazmi; A.A. El-Bary; M.H. Raddadi. Numerical solution and dynamical behaviors for solving fractional nonlinear Rubella ailment disease model. Results in Physics 2021, 24, 104091 .
AMA StyleA.M.S. Mahdy, M.S. Mohamed, Kh. Lotfy, M. Alhazmi, A.A. El-Bary, M.H. Raddadi. Numerical solution and dynamical behaviors for solving fractional nonlinear Rubella ailment disease model. Results in Physics. 2021; 24 ():104091.
Chicago/Turabian StyleA.M.S. Mahdy; M.S. Mohamed; Kh. Lotfy; M. Alhazmi; A.A. El-Bary; M.H. Raddadi. 2021. "Numerical solution and dynamical behaviors for solving fractional nonlinear Rubella ailment disease model." Results in Physics 24, no. : 104091.
The fundamental solution of generalized magneto thermo viscoelasticity (MTVE) with two relaxation times for perfect isotropic conduction is obtained. An infinitely long circular cylinder application has been studied. The solution is obtained by the potential method. In the transform domain Laplace and Hankel are used to obtain the solution. The inverse process is performed by asymptotic expansions appropriate for limited time values. Numerical results are displayed and graphically explained for the temperature and stress distributions. A comparison is made with the results obtained in the presence and absence of a magnetic field, for different values of time and for two theories (MTE and MTVE).
A. A. El-Bary; Haitham. M. Atef. Fundamental solution of generalized magneto-thermo-viscoelasticity with two relaxation times for a perfect conductor cylindrical region. Waves in Random and Complex Media 2021, 1 -19.
AMA StyleA. A. El-Bary, Haitham. M. Atef. Fundamental solution of generalized magneto-thermo-viscoelasticity with two relaxation times for a perfect conductor cylindrical region. Waves in Random and Complex Media. 2021; ():1-19.
Chicago/Turabian StyleA. A. El-Bary; Haitham. M. Atef. 2021. "Fundamental solution of generalized magneto-thermo-viscoelasticity with two relaxation times for a perfect conductor cylindrical region." Waves in Random and Complex Media , no. : 1-19.
This paper deals with the photothermal interaction of an isotropic, homogenous, semiconducting, viscothermoelastic solid cylinder in the context of Lord-Shulman's of generalized thermoelasticity theory. The cylinder rotates around its axis with constant angular velocity. The bounding surface of the cylinder has been thermally shocked. The governing equations have been constructed in the Laplace transform domain and numerically calculated inversions of Laplace using the Tzou method. The numerical results for the carrier density increment, temperatures increment, strain, stress, and stress-strain energy have been represented graphically with various values mechanical relaxation time, angular velocity parameter, and lifetime parameter of a photogenerated carrier. The mechanical relaxation time and angular velocity of the rotation parameter have minimal effects on the carrier density function and temperature increment, while its effects on the strain, stress, and stress-strain energy are significant. The photogenerated carrier's lifespan parameter has essential implications on all functions studied.
Hamdy M. Youssef; Alaa A. El-Bary. Characterization of the photothermal interaction on a viscothermoelastic semiconducting solid cylinder due to rotation under Lord-Shulman model. Alexandria Engineering Journal 2020, 60, 2083 -2092.
AMA StyleHamdy M. Youssef, Alaa A. El-Bary. Characterization of the photothermal interaction on a viscothermoelastic semiconducting solid cylinder due to rotation under Lord-Shulman model. Alexandria Engineering Journal. 2020; 60 (2):2083-2092.
Chicago/Turabian StyleHamdy M. Youssef; Alaa A. El-Bary. 2020. "Characterization of the photothermal interaction on a viscothermoelastic semiconducting solid cylinder due to rotation under Lord-Shulman model." Alexandria Engineering Journal 60, no. 2: 2083-2092.
The thermal quality factor is the most significant parameter of the micro/nanobeam resonator. Less energy is released by vibration and low damping, which results in greater efficiency. Thus, for a simply supported microbeam resonator made of silicon (Si), a thermal analysis of the thermal quality factor was introduced. A force due to static prestress was considered. The governing equations were constructed in a unified system. This system generates six different models of heat conduction; the traditional Lord–Shulman, Lord–Shulman based on classical Caputo fractional derivative, Lord–Shulman based on the Caputo–Fabrizio fractional derivative, traditional Tzou, Tzou based on the classical Caputo fractional derivative, and Tzou based on the Caputo–Fabrizio fractional derivative. The results show that the force due to static prestress, the fractional order parameter, the isothermal value of natural frequency, and the beam’s length significantly affect the thermal quality factor. The two types of fractional derivatives applied have different and significant effects on the thermal quality factor.
Hamdy M. Youssef; Alaa A. El-Bary; Eman A. N. Al-Lehaibi. Characterization of the Quality Factor Due to the Static Prestress in Classical Caputo and Caputo–Fabrizio Fractional Thermoelastic Silicon Microbeam. Polymers 2020, 13, 27 .
AMA StyleHamdy M. Youssef, Alaa A. El-Bary, Eman A. N. Al-Lehaibi. Characterization of the Quality Factor Due to the Static Prestress in Classical Caputo and Caputo–Fabrizio Fractional Thermoelastic Silicon Microbeam. Polymers. 2020; 13 (1):27.
Chicago/Turabian StyleHamdy M. Youssef; Alaa A. El-Bary; Eman A. N. Al-Lehaibi. 2020. "Characterization of the Quality Factor Due to the Static Prestress in Classical Caputo and Caputo–Fabrizio Fractional Thermoelastic Silicon Microbeam." Polymers 13, no. 1: 27.
This research aims to explore and identify the critical success factors (CSFs) needed to facilitate and guarantee the implementation of successful public private partnership (PPP) projects in the education sector in Egypt. Thus, the research proposed a CSFs model based on an exhaustive literature review to identify CSFs for PPPs’ successful implementation. The identified 21 CSFs were divided into four groups: political, legal, economic and financial as well as operational and managerial. A qualitative and quantitative analysis that involved semi-structured interviews and a questionnaire survey tool was applied to gather required data. Then, data were analyzed using the Nvivo program, correlation, and structural equation modeling (SEM) to test the hypothesis for the research. The results showed that the set of four CSFs groups which are political, legal, economic and financial as well as managerial and operational have positive significant impacts on successful PPP implementation in education in Egypt. Results also show that managerial and operational factors are the most significant factors followed by legal factors, political factors, then economic and financial factors. Finally, it is worth mentioning that the research findings provide the private sector investor with the direction, clarity and guidance essential to create the confidence needed to invest in the education market and programs in Egypt. It also provides public sector employees with a clear vision for the environment and conditions needed to embrace PPP projects in the sector of education in Egypt.
Riham Helmy; Nevien Khourshed; Mohamed Wahba; Alaa Abd El Bary. Exploring Critical Success Factors for Public Private Partnership Case Study: The Educational Sector in Egypt. Journal of Open Innovation: Technology, Market, and Complexity 2020, 6, 142 .
AMA StyleRiham Helmy, Nevien Khourshed, Mohamed Wahba, Alaa Abd El Bary. Exploring Critical Success Factors for Public Private Partnership Case Study: The Educational Sector in Egypt. Journal of Open Innovation: Technology, Market, and Complexity. 2020; 6 (4):142.
Chicago/Turabian StyleRiham Helmy; Nevien Khourshed; Mohamed Wahba; Alaa Abd El Bary. 2020. "Exploring Critical Success Factors for Public Private Partnership Case Study: The Educational Sector in Egypt." Journal of Open Innovation: Technology, Market, and Complexity 6, no. 4: 142.
The effect of external magnetic field during microelement processes is used to discuss the excited semiconductor medium in generalized thermoelasticity theory. The thermal conductivity which depends on the temperature is investigated in the context of the photothermal theory to obtain the main variables for a rotator elastic semiconductor medium. In this case the thermal conductivity is variable. The elastic-plasma-thermal waves in two-dimension (2D) deformation have been constructed. Fourier and Laplace integral transformations are used to solve the main governing equations under the effect of microtemperature vector field. Analytical solutions of the main physical field quantities are obtained under these transformations to get the solutions in the physical domain. The mechanical ramp type condition and some other thermal-elastic-plasma conditions are applied on the outer free surface of the medium. To obtain complete solutions for the basic physical quantities, numerical inversion methods of Fourier and Laplace transformations are used in space-time physical domain. Some comparisons are made for some several parameters that they represent graphically and discussed.
Kh. Lotfy; A. A. El-Bary. Response of Mechanical Ramp Type of Semiconductor Magneto-Rotator Medium with Variable Thermal Conductivity during Photo-Excitation Microelement Processes. Silicon 2020, 1 -15.
AMA StyleKh. Lotfy, A. A. El-Bary. Response of Mechanical Ramp Type of Semiconductor Magneto-Rotator Medium with Variable Thermal Conductivity during Photo-Excitation Microelement Processes. Silicon. 2020; ():1-15.
Chicago/Turabian StyleKh. Lotfy; A. A. El-Bary. 2020. "Response of Mechanical Ramp Type of Semiconductor Magneto-Rotator Medium with Variable Thermal Conductivity during Photo-Excitation Microelement Processes." Silicon , no. : 1-15.
The environment and the physiological conditions play a vital role in the thermal processes in the human tissues, such as the multi-layered human-eye. In this work, a mathematical model of the human eye concerning the change in blood perfusion, porosity, evaporation rate, and ambient temperatures has been formulated based on non-Fourier heat conduction law with appropriate boundary and interface conditions. A direct method and MAPLE 17 software was used to get the numerical solution, and the results have been shown in figures. The temperature distribution based on various values of the relaxation times parameters has been discussed first to stand on its effect on the value of the temperature in each layer of the human eye. The impact of the blood perfusion, porosity, evaporation rate, time, and ambient temperatures have been discussed; they have significant effects on the thermal wave passing through the human eye layers. For validity, the results of this model have agreed with the results of some other works.
Hamdy M. Youssef; Alaa A. El-Bary. The thermal behavior analysis of the human eye under the heat conduction law with one relaxation time. Alexandria Engineering Journal 2020, 59, 5263 -5271.
AMA StyleHamdy M. Youssef, Alaa A. El-Bary. The thermal behavior analysis of the human eye under the heat conduction law with one relaxation time. Alexandria Engineering Journal. 2020; 59 (6):5263-5271.
Chicago/Turabian StyleHamdy M. Youssef; Alaa A. El-Bary. 2020. "The thermal behavior analysis of the human eye under the heat conduction law with one relaxation time." Alexandria Engineering Journal 59, no. 6: 5263-5271.
The semiconductor elastic medium in the context of the photothermal theory under the influence of rotation field is studied. A novel model of the governing equations is investigated due to the refined multi-phase-lags with the thermal relaxation times of the heat equation with the hydrostatic initial stress during transport process of the photothermal phenomenon. The interaction between the multi-waves of elastic-thermal-plasma is obtained. The normal mode method in the two dimensions is applied to obtain the exact solutions of the basic physical quantities under investigation. Plasma, thermal and mechanical loads have been applied on the free surface of the semi-infinite semiconductor elastic medium to get the complete solutions of the basic physical fields. Some comparisons are shown graphically and they are discussed as a function of thermal memories with the variation of some parameters. Silicon (Si) material is used to make the numerical simulation and to display the sensitivity to the variation of the rotation parameter.
Kh. Lotfy; A. El-Bary; E.A. Ismail; Haitham M. Atef. Analytical solution of a rotating semiconductor elastic medium due to a refined heat conduction equation with hydrostatic initial stress. Alexandria Engineering Journal 2020, 59, 4947 -4958.
AMA StyleKh. Lotfy, A. El-Bary, E.A. Ismail, Haitham M. Atef. Analytical solution of a rotating semiconductor elastic medium due to a refined heat conduction equation with hydrostatic initial stress. Alexandria Engineering Journal. 2020; 59 (6):4947-4958.
Chicago/Turabian StyleKh. Lotfy; A. El-Bary; E.A. Ismail; Haitham M. Atef. 2020. "Analytical solution of a rotating semiconductor elastic medium due to a refined heat conduction equation with hydrostatic initial stress." Alexandria Engineering Journal 59, no. 6: 4947-4958.
This paper is dealing with the photothermal interaction of a homogenous, isotropic, semiconducting, viscothermoelastic solid cylinder in the context of Green-Naghdi theories of generalized thermoelasticity (type-I, -II, and -III). The ramp-type heating has thermally loaded the bounding surface of the cylinder. The governing equations have been constructed in the Laplace transform domain, and the Laplace inversions have been calculated numerically by using the Tzou method. The numerical results for the carrier density increment, temperatures increment, strain, stress, and stress-strain energy have been represented in figures with various values of mechanical relaxation time and ramp-time heat parameter. The mechanical relaxation time has minimal effects on the carrier density function and temperature increment, while its effects on the strain, stresses, and stress-strain energy are significant. The ramp-time heat parameter has significant effects on all the studied functions.
Hamdy M. Youssef; Alaa A. El-Bary. Characterization of the photothermal interaction on a viscoelastic semiconducting solid cylinder due to ramp-type heating based on green-naghdi theories. Results in Physics 2020, 19, 103396 .
AMA StyleHamdy M. Youssef, Alaa A. El-Bary. Characterization of the photothermal interaction on a viscoelastic semiconducting solid cylinder due to ramp-type heating based on green-naghdi theories. Results in Physics. 2020; 19 ():103396.
Chicago/Turabian StyleHamdy M. Youssef; Alaa A. El-Bary. 2020. "Characterization of the photothermal interaction on a viscoelastic semiconducting solid cylinder due to ramp-type heating based on green-naghdi theories." Results in Physics 19, no. : 103396.
This paper aims to study the propagation of surface waves in generalized magneto-thermoelastic media under influence of magnetic field and rotation and its applications in Engineering, Geophysics, and Petroleum extracting. The governing equations are considered for generalized thermoelastic problem under magnetic field and rotation and solved to obtain the general solution in x-z plane. The Lame's potential method considering harmonic functions for the physical quantities is used to obtain the secular equation and then the velocity and attenuation coefficient for the types of waves: Stoneley, Love, and Rayleigh. The appropriate boundary conditions at an interface between two dissimilar half-spaces are satisfied with appropriate particular solutions to obtain the frequency equation of the surface wave in the medium. Some special cases as: Stoneley waves, Rayleigh and Love waves also discussed and presented graphically to show the physical meaning of the external parameters effect on the petroleum extracting phenomena and its contributions in KSA vision 2030 in crystal, Iron and steel. A comparison is made with the previous results considering LS model and the absence of rotation that deduces to the previous results as a special case from the present study. Also, if the magnetic field and rotation vanish, the results obtained in the present work are discussed. Experimentally, the results obtained agree with the labs results obtained. The results obtained indicate to a significant impact of the magnetic field and rotation on the waves propagation phenomenon that contributes on the industries and related topics.
M. M. Amin; Amir Mohamed Abdel Allah Nasr; A. A. El-Bary; S. M. Abo-Dahab. Propagation of surface waves in generalized thermoelastic media under influence of magnetic field and rotation and its applications in engineering and geophysics. Mechanics Based Design of Structures and Machines 2020, 1 -24.
AMA StyleM. M. Amin, Amir Mohamed Abdel Allah Nasr, A. A. El-Bary, S. M. Abo-Dahab. Propagation of surface waves in generalized thermoelastic media under influence of magnetic field and rotation and its applications in engineering and geophysics. Mechanics Based Design of Structures and Machines. 2020; ():1-24.
Chicago/Turabian StyleM. M. Amin; Amir Mohamed Abdel Allah Nasr; A. A. El-Bary; S. M. Abo-Dahab. 2020. "Propagation of surface waves in generalized thermoelastic media under influence of magnetic field and rotation and its applications in engineering and geophysics." Mechanics Based Design of Structures and Machines , no. : 1-24.