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Ibrahim A. Abbas 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.10
The thermoelastic interaction in an unbounded medium with a spherical cavity is studied using two-temperature generalized thermoelasticitytheory. The medium is assumed to be initially quiescent. The inner surface of the cavity is taken traction free and subjected to athermal shock. By the Laplace transformation, the basic equations are expressed in the form of a vector-matrix differential equation,which is solved by an eigenvalue approach. Some comparison have been shown in figures to estimate the effect of the two-temperatureparameter.
Binary Classification of Hypertensive Retinopathy Using Deep Dense CNN Learning
Mostafa E.A., Ibrahim,Qaisar, Abbas International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.12
A condition of the retina known as hypertensive retinopathy (HR) is connected to high blood pressure. The severity and persistence of hypertension are directly correlated with the incidence of HR. To avoid blindness, it is essential to recognize and assess HR as soon as possible. Few computer-aided systems are currently available that can diagnose HR issues. On the other hand, those systems focused on gathering characteristics from a variety of retinopathy-related HR lesions and categorizing them using conventional machine-learning algorithms. Consequently, for limited applications, significant and complicated image processing methods are necessary. As seen in recent similar systems, the preciseness of classification is likewise lacking. To address these issues, a new CAD HR-diagnosis system employing the advanced Deep Dense CNN Learning (DD-CNN) technology is being developed to early identify HR. The HR-diagnosis system utilized a convolutional neural network that was previously trained as a feature extractor. The statistical investigation of more than 1400 retinography images is undertaken to assess the accuracy of the implemented system using several performance metrics such as specificity (SP), sensitivity (SE), area under the receiver operating curve (AUC), and accuracy (ACC). On average, we achieved a SE of 97%, ACC of 98%, SP of 99%, and AUC of 0.98. These results indicate that the proposed DD-CNN classifier is used to diagnose hypertensive retinopathy.
Analytical solution of a two-dimensional thermoelastic problem subjected to laser pulse
Ibrahim A. Abbas,Faris S. Alzahrani 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.21 No.4
In this article, the problem of a two-dimensional thermoelastic half-space are studied using mathematical methods under the purview of the generalized thermoelastic theory with one relaxation time is studied. The surface of the half-space is taken to be thermally insulated and traction free. Accordingly, the variations of physical quantities due to by laser pulse given by the heat input. The nonhomogeneous governing equations have been written in the form of a vector-matrix differential equation, which is then solved by the eigenvalue approach. The analytical solutions are obtained for the temperature, the components of displacement and stresses. The resulting quantities are depicted graphically for different values of thermal relaxation time. The result provides a motivation to investigate the effect of the thermal relaxation time on the physical quantities.
A GN model of thermoelastic interaction in a 2D orthotropic material due to pulse heat flux
Aatef Hobiny,Ibrahim A. Abbas 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.80 No.6
A GN model with and without energy dissipations is used to discuss the waves propagation in a two-dimension orthotropic half space by the eigenvalues approach. Using the Laplace-Fourier integral transforms to get the solutions of the problem analytically, the basic formulations of the two-dimension problem are given by matrices-vectors differential forms, which are then solved by the eigenvalues scheme. Numerical techniques are used for the inversion processes of the Laplace- Fourier transform. The results for physical quantities are represented graphically. The numerical outcomes show that the characteristic time of pulse heat flux have great impacts on the studied fields values.
Nonlocal heat conduction approach in biological tissue generated by laser irradiation
Abbas, Ibrahim A.,Abdalla, Aboelnour,Sapoor, Hussien Techno-Press 2022 Advances in materials research Vol.11 No.2
A novel nonlocal model with one thermal relaxation time is presented to investigates the thermal damages and the temperature in biological tissues generated by laser irradiations. To obtain these models, we used the theory of the non-local continuum proposed by Eringen. The thermal damages to the tissues are assessed completely by the denatured protein ranges using the formulations of Arrhenius. Numerical results for temperature and the thermal damage are graphically presented. The effects nonlocal parameters and the relaxation time on the distributions of physical fields for biological tissues are shown graphically and discussed.
A study on thermo-elastic interactions in 2D porous media with-without energy dissipation
Faris Alzahrani,Ibrahim A. Abbas 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.38 No.5
The generalized thermoelastic analysis problem of a two-dimension porous medium with and without energy dissipation are obtained in the context of Green–Naghdi's (GNIII) model. The exact solutions are presented to obtain the studying fields due to the pulse heat flux that decay exponentially in the surface of porous media. By using Laplace and Fourier transform with the eigenvalues scheme, the physical quantities are analytically presented. The surface is shocked by thermal (pulse heat flux problems) and applying the traction free on its outer surfaces (mechanical boundary) through transport (diffusion) process of temperature to observe the analytical complete expression of the main physical fields. The change in volume fraction field, the variations of the displacement components, temperature and the components of stress are graphically presented. Suitable discussion and conclusions are presented.
2D deformation in initially stressed thermoelastic half-space with voids
Ibrahim A. Abbas,Rajneesh Kumar 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.20 No.5
The present investigation is to study the plane problem in initially stressed thermoelastic half-space with voids due to thermal source. Lord-Shulman (Lord and Shulman 1967) theory of thermoelasticity with one relaxation time has been used to investigate the problem. A particular type of thermal source has been taken as an application of the approach. Finite element technique has been used to solve the problem. The components of displacement, stress, temperature change and volume fraction field are computed numerically. The resulting quantities are depicted graphically for different values of initial stress parameter. The relaxation time and the initial stress parameter have a significant effect on all distributions.
Ibrahim A. Abbas,Aboelnour Abdalla,Fathi Anwar,Hussien Sapoor Techno-Press 2023 Advances in materials research Vol.12 No.1
In the present article, the effects of three thermal relaxation times in living tissue under the three-phaselag (TPL) bioheat model are introduced. Using the Laplace transforms, the analyticalsolution of the temperature and the resulting thermal damagesin living tissues are obtained. The experimental data are used to validate the analytical solutions. By the formulations of Arrhenius, the thermal damage of tissue is estimated. Numerical outcomes for the temperature and the resulting of thermal damages are presented graphically. The effects of parameters, such as thermalrelaxation times, blood perfusion rate on tissue temperature are also discussed in detail.
Generalized thermo-elastic interaction in a fiber-reinforced material with spherical holes
Aatef D. Hobiny,Ibrahim A. Abbas 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.78 No.3
In this paper, a mathematical model is used to the evaluation of thermoelastic interactions in fiber-reinforced material with a spherical cavity. With the goal of establishing the generalized thermoelastic model with thermal relaxation time are exploited. inner surface of the spherical cavity is tractions free and loaded by the uniform step in temperature. The finite element scheme is used to get the problem numerical solutions. The numerical results have been discussed graphically to show the impacts of the presence and the absence of reinforcement.
The effect of magnetic field on a thermoelastic fiber-reinforced material under GN-III theory
Faris S. Alzahrani,Ibrahim A. Abbas 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.22 No.2
In this work, the two-dimensional generalized magneto-thermoelastic problem of a fiber-reinforced anisotropic material is investigated under Green and Naghdi theory of type III. The solution will be obtained for a certain model when the half space subjected to ramp-type heating and traction free surface. Laplace and exponential Fourier transform techniques are used to obtain the analytical solutions in the transformed domain by the eigenvalue approach. The inverses of Fourier transforms are obtained analytically. The results have been verified numerically and are represented graphically. Comparisons are made with the results predicted by the presence and absence of reinforcement and magnetic field.