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A New BEM Modeling Algorithm for Size-Dependent Thermopiezoelectric Problems in Smart Nanostructures

Computers, Materials & Continua 2021年第10期69卷 931-944页

作者： Mohamed Abdelsabour fahmy Department of Mathematics Jamoum University CollegeUmm Al-Qura UniversityAlshohdaa25371JamoumMakkahSaudi Arabia Department of Basic Sciences Faculty of Computers and InformaticsSuez Canal UniversityNew CampusIsmailia41522Egypt

The main objective of this paper is to introduce a new theory called size-dependent thermopiezoelectricity for smart *** proposed theory includes the combination of thermoelastic and piezoelectric influences which enable us to describe the deformation and mechanical behaviors of smart nanostructures subjected to thermal,and piezoelectric *** of difficulty of experimental research problems associated with the proposed ***,we propose a new boundary element method(BEM)formulation and algorithm for the solution of such problems,which involve temperatures,normal heat fluxes,displacements,couple-tractions,rotations,force-tractions,electric displacement,and normal electric displacement as primary variables within the BEM *** computational performance of the proposed methodology has been demonstrated by using the generalized modified shift-splitting(GMSS)iteration method to solve the linear systems resulting from the BEM *** advantages are investigated and compared with other iterative *** numerical results are depicted graphically to show the size-dependent effects of thermopiezoelectricity,thermoelasticity,piezoelectricity,and elasticity theories of *** numerical results also show the effects of the sizedependent and piezoelectric on the displacement *** validity,efficiency and accuracy of the proposed BEM formulation and algorithm have been *** findings of the current study contribute to the further development of technological and industrial applications of smart nanostructures.

关键词： Boundary element method size-dependent thermopiezoelectricity smart nanostructures

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A Novel BEM for Modeling and Simulation of 3T Nonlinear Generalized Anisotropic Micropolar-Thermoelasticity Theory with Memory Dependent Derivative

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Computer Modeling in Engineering & Sciences 2021年第1期126卷 175-199页

作者： Mohamed Abdelsabour fahmy Jamoum University College Umm Al-Qura UniversityMakkahSaudi Arabia Faculty of Computers and Informatics Suez Canal University New CampusIsmailia41522Egypt

The main aim of this paper is to propose a new memory dependent derivative(MDD)theory which called threetemperature nonlinear generalized anisotropic *** system of governing equations of the problems associated with the proposed theory is extremely difficult or impossible to solve analytically due to nonlinearity,MDD diffusion,multi-variable nature,multi-stage processing and anisotropic properties of the considered ***,we propose a novel boundary element method(BEM)formulation for modeling and simulation of such *** computational performance of the proposed technique has been *** numerical results illustrate the effects of time delays and kernel functions on the nonlinear three-temperature and nonlinear displacement *** numerical results also demonstrate the validity,efficiency and accuracy of the proposed *** findings and solutions of this study contribute to the further development of industrial applications and devices typically include micropolar-thermoelastic materials.

关键词： Boundary element method memory dependent derivative three-temperature nonlinear generalized anisotropic micropolar-thermoelasticity

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A New BEM for Fractional Nonlinear Generalized Porothermoelastic Wave Propagation Problems

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Computers, Materials & Continua 2021年第7期68卷 59-76页

作者： Mohamed Abdelsabour fahmy Department of Mathematics Jamoum University CollegeUmm Al-Qura UniversityAlshohdaa25371JamoumSaudi Arabia Department of Basic Sciences Faculty of Computers and InformaticsSuez Canal UniversityNew CampusIsmailia41522Egypt

The main purpose of the current article is to develop a novel boundary element model for solving fractional-order nonlinear generalized porothermoelastic wave propagation problems in the context of temperaturedependent functionally graded anisotropic(FGA)*** system of governing equations of the considered problem is extremely very difficult or impossible to solve analytically due to nonlinearity,fractional order diffusion and strongly anisotropic mechanical and physical properties of considered porous ***,an efficient boundary element method(BEM)has been proposed to overcome this difficulty,where,the nonlinear terms were treated using the Kirchhoff transformation and the domain integrals were treated using the Cartesian transformation method(CTM).The generalized modified shift-splitting(GMSS)iteration method was used to solve the linear systems resulting from BEM,also,GMSS reduces the iterations number and CPU execution time of *** numerical findings show the effects of fractional order parameter,anisotropy and functionally graded material on the nonlinear porothermoelastic stress *** numerical outcomes are in very good agreement with those from existing literature and demonstrate the validity and reliability of the proposed methodology.

关键词： Boundary element method fractional-order nonlinear generalized porothermoelasticity wave propagation functionally graded anisotropic structures Cartesian transformation method

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NUMERICAL MODELING OF TRANSIENT MAGNETO-THERMO-VISCOELASTIC WAVES IN A ROTATING NONHOMOGENEOUS ANISOTROPIC SOLID UNDER INITIAL STRESS

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International Journal of Modeling, Simulation, and Scientific Computing 2012年第2期3卷 85-108页

作者： MOHAMED ABDELSABOUR fahmy Faculty of Computers and Informatics Suez Canal UniversityIsmailiaEgypt

A numerical model based on the dual-reciprocity boundary element method(DRBEM)for studying the transient magneto-thermo-viscoelastic waves in a rotating nonhomogeneous anisotropic solid is *** formulation is tested through its application to the problem of an initially stressed solid placed in a constant primary magnetic field acting in the direction of the z-axis and rotating about this axis with a constant angular *** the case of plane deformation,a numerical scheme for the implementation of the method is presented and the numerical computations are carried out for the temperature,displacement components and thermal stress *** validity of DRBEM is examined by considering a magneto-thermo-viscoelastic solid occupies a rectangular region and good agreement is obtained with existent *** results obtained are presented graphically to show the influence of initial stress on the displacement components and thermal stress components.

关键词： Magneto-thermo-viscoelastic stresses rotation inhomogeneity anisotropic dual reciprocity boundary element method.

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Conjunctival flap advancement with or without scleral graft for hypotony maculopathy after trabeculectomy

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International Journal of Ophthalmology(English edition) 2020年第7期13卷 1079-1086页

作者： Abdelhamid Shaker Elhofi Mohamed fahmy Doheim Amir AbouSamra Department of Ophthalmology Faculty of MedicineAlexandria UniversityAlexandria 21131Egypt Faculty of Medicine Alexandria UniversityAlexandria 21131Egypt

AIM: To investigate the outcomes of adaptive conjunctival flap advancement surgical techniques with or without scleral graft for patients undergoing revision surgery after ***: This retrospective study included 28 eyes of 28 subjects from December 2015 to April 2018. A group of 15 eyes underwent conjunctival advancement only while the other 13 eyes did conjunctival advancement with partial thickness scleral graft. In both study groups, we considered the intraocular pressure(IOP) as our primary outcome and visual acuity(VA) as our secondary outcome. Both were assessed pre-and post-operatively till the last followup possible point. Additionally, we classified the patients according to complete and qualified success ***: The mean age of the conjunctival advancement group was 36.87±19.25 y, while it was 44.08±18.04 in the other group. In both study groups, the mean IOP significantly increased after revision surgery at 1, 2, 3 mo and the last follow-up visit when compared to prior the surgery(P<0.001). Moreover, VA was significantly improved(P=0.03) in the final follow-up for both surgical techniques. When we compared the change from baseline in both groups, there was no significant difference between IOP improvement in 1 mo(P=0.263), while the difference was significant in 2 mo(P=0.03), 3 mo(P=0.02) and in the final follow-up visit postoperatively. However, this difference was not significant regarding VA(P=0.5).CONCLUSION: The both adaptive techniques of conjunctival advancement and conjunctival advancement with scleral graft are effective for treating patients with lateonset hypotony. Yet, more prospective studies are needed to assert upon these results.

关键词： trabeculectomy scleral melting revision surgery hypotony maculopathy

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Liver stiffness as a predictor of hepatocellular carcinoma behavior in patients with hepatitis C related liver cirrhosis

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Hepatobiliary & Pancreatic Diseases International 2020年第1期19卷 22-28页

作者： Sameh A Lashen Mohamed M Elshafei fahmy H Hablass Eman A Alsayed Asmaa A Hassan Department of Internal Medicine Faculty of MedicineUniversity of AlexandriaAlexandriaEgypt Department of Radiology Faculty of MedicineUniversity of AlexandriaAlexandriaEgypt Department of Biomedical Informatics and Medical Statistics Medical Research InstituteUniversity of AlexandriaAlexandriaEgypt

Background: Risk strati cation and prognostication of hepatocellular carcinoma (HCC) help to improve patient outcome. Herein we investigated the role of liver stiffness measurement (LSM) in the prediction of HCC behavior. Methods: Totally 121 na ve patients with HCC were included. HCC radiological evaluation and staging were done. LSM was measured using virtual touch quanti cation. Patients were divided into early to intermediate HCC (BCLC-0, A and B) and late HCC (BCLCC and D). HCC was treated according to the BCLC stage. HCC recurrence-free interval was estimated. Results: The mean LSM inside the tumor was signi cantly lower than the peri-tumoral area and the cirrhotic non-cancerous liver parts (P<0.001). In late HCCs stage, the mean LSM inside the tumor and in the peri-tumoral tissue was lower than the corresponding values in the early to intermediate HCCs stage (P<0.001). LSM inside the tumor and in the peri-tumoral tissue negatively correlated with serum AFP, tumor vascular invasion, and stage (P<0.05). The recurrence-free interval was directly correlated to LSM inside the tumor and inversely to LSM in cirrhotic non tumorous liver part. Kaplan-Meier analysis showed that the recurrence-free interval was signi cantly longer in patients with LSM inside the tumor of ≥1.25m/s compared to those with LSM inside the tumor of<1.25m/s. Conclusions: LSM can serve as a potential non-invasive predictor for HCC clinical behavior and the recurrence-free interval following loco-regional treatments.

关键词： Fibrosis Hepatitis C Hepatocellular carcinoma Point shear wave Liver cirrhosis

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Modified malleable prosthesis with a fixed mesh:case series for the Ghattas technique

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Asian Journal of Andrology 2022年第2期24卷 167-170页

作者： Osama Ghattas Mohamed fahmy Doheim Hossam Kotb Arthur L Burnett Dar-elzokora Center of Andrology Alexandria 21500Egypt Alexandria Faculty of Medicine Alexandria UniversityAlexandria 21131Egypt Department of Urology Johns Hopkins University School of MedicineBaltimoreMD 21287USA

Penile prosthetic implantation represents a cornerstone for patients with organic erectile dysfunction(ED)that is refractory,unsatisfactory,or contra-indicated for other approved medical or mechanical *** this study,we introduce the“Ghattas technique,”wherein we constructed a polypropylene mesh sheath that surrounds and is fixed to a 13-mm malleable prosthesis cylinder,which can increase the cylinder diameter for cases that need a larger *** patients underwent preoperative evaluation and completed the five-item International Index of Erectile Function questionnaire(IIEF-5).Postoperative outcomes were evaluated by IIEF-5 and Erectile Dysfunction Inventory of Treatment Satisfaction(EDITS)questionnaires at final *** mean age of the 23 included patients was 57.9(standard deviation[s.d.]:11.4)years and the mean duration of ED was 8.5(s.d.:7.9)*** improvement was determined by comparing mean preoperative and postoperative IIEF-5 scores(8.3[s.d.:3.9]vs 24.6[s.d.:0.6],P<0.001).High treatment satisfaction was determined according to a mean EDITS score of 94.9(s.d.:9.9).The proposed Ghattas technique was safe and effective in our patients,and provides opportunity for cases that need a diameter larger than 13 *** studies are needed to confirm these results.

关键词： erectile dysfunction mesh penile prosthesis surgical technique

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Design and Optimization of Interior Permanent Magnet(IPM)Motor for Electric Vehicle Applications

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CES Transactions on Electrical Machines and Systems 2023年第2期7卷 202-209页

作者： Lavanya Balasubramanian Nurul Azim Bhuiyan Asad Javied Ashraf A.fahmy Fawzi Belblidia Johann Sienz the Advanced Sustainable Manufacturing Technologies(ASTUTE 2020)operation Swansea UniversityUK the Department of Electrical Power and Machines Helwan UniversityHelwan 11795Egypt

This paper explores some design parameters of an interior permanent magnet synchronous motor that contribute to enhancing motor *** geometry parameters such as magnet dimension,machine diameter,stator teeth height,and number of poles are analyzed to compare overall torque,power,and torque ripples in order to select the best design parameters and their ***,an open-source software,is used to design and optimize the motor for electric vehicle *** optimization with Non-dominated Sorting Genetic Algorithm(NSGA-Ⅱ),two designs A and B were obtained for two objective functions and the corresponding torque ripples values of the design A and B were later reduced by 32%and 77%.Additionally,the impact of different magnet grades on the output performances is analyzed.

关键词： Electric vehicles IPM motor Magnet grade Optimization Permanent magnet motor Torque ripple

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Adaptive Hybrid Bivariate Double Density Discrete and Complex Wavelet for Image Denoising

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Journal of Computer and Communications 2023年第2期11卷 39-56页

作者： Gamal fahmy Mamdouh F. fahmy Omar fahmy Faculty of Computer Science and Engineering Galala University Al Galala Egypt Electrical Engineering Dept. Assiut University Assiut Egypt Electrical Engineering Dept. Badr University Cairo Egypt

Image denoising is an important step in eliminating any noise impact in any image transmission process. Recently we presented two approaches for Bivariate based image denoising. They were Double Density Discrete Wavelet Transform (DD DWT) and Double Density Dual Tree Complex Wavelet Transform (DD CWT). In both techniques we decomposed noisy images with either DD DWT or DD CWT decompositions and then applied the Bivariate based denoising technique for noise removal. In this paper we propose an adaptive hybrid technique for Bivariate based image denoising that is based on the synthesis of DD-DWT bands or DD-CWT bands but with different weights, to deliver enhanced image features with less denoising impact especially around image edges, which is the most effected by noisy transmission channels. This proposed technique has been also enhanced by edge sharpening and Eigen analysis, as two separate stages. Simulation result comparisons have been performed between the proposed hybrid band adaptive DD-DWT and DD-CWT technique and the two primary techniques DD-DWT, DD- CWT, as well as other superior literature techniques such the original bivariate denoising technique with both original Complex Wavelet Transform and Double Density decompositions. This work in specific compares between Double Density DWT and Double Density CWT decompositions, proposes new filter design that suits each of them and proposes a hybrid technique between as will be shown.

关键词： Complex Wavelet Image Deniosing Double Density Wavelets

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Cartilage and facial muscle tissue engineering and regeneration： a mini review

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Bio-Design and Manufacturing 2018年第2期1卷 115-122页

作者： Michael Del Monico Mohammadreza Tahriri Mina D. fahmy Hamed Ghassemi Daryoosh Vashaee Lobat Tayebi Marquette University School of Dentistry Milwaukee WI 53233 USA Eye Research Center Farabi Eye Hospital Tehran University of Medical Sciences Tehran Iran Department of Electrical and Computer Engineering North Carolina State University Raleigh NC 27606 USA

Cartilage and facial muscle tissue provide basic yet vital functions for homeostasis throughout the body, making human survival and function highly dependent upon these somatic components. When cartilage and facial muscle tissues are harmed or completely destroyed due to disease, trauma, or any other degenerative process, homeostasis and basic body functions consequently become negatively affected. Although most cartilage and cells can regenerate themselves after any form of the aforementioned degenerative disease or trauma, the highly specific characteristics of facial muscles and the specific structures of the cells and tissues required for the proper function cannot be exactly replicated by the body itself. Thus, some form of cartilage and bone tissue engineering is necessary for proper regeneration and function. The use of progenitor cells for this purpose would be very beneficial due to their highly adaptable capabilities, as well as their ability to utilize a high diffusion rate, making them ideal for the specific nature and functions of cartilage and facial muscle tissue. Going along with this, once the progenitor cells are obtained, applying them to a scaffold within the oral cavity in the affected location allows them to adapt to the environment and create cartilage or facial muscle tissue that is specific to the form and function of the area. The principal function of the cartilage and tissue is vascularization, which requires a specific form that allows them to aid the proper flow of bodily functions related to the oral cavity such as oxygen flow and removal of waste. Facial muscle is also very thin, making its reproduction much more possible. Taking all these into consideration, this review aims to highlight and expand upon the primary benefits of the cartilage and facial muscle tissue engineering and regeneration, focusing on how these processes are performed outside of and within the body.

关键词： Soft tissue regeneration Cartilage tissue engineering Muscle tissue engineering Facial regeneration

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