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A robust multi-objective and multi-physics optimization of multi-physics behavior of microstructure

Journal of Central South University 2016年第12期23卷 3225-3238页

作者： Hamda Chagraoui mohamed Soula mohamed Guedri Research Unit in Structural Dynamics Modeling and Engineering of Multi-Physics SystemsSDMESMNabeul Preparatory Engineering Institute-IPEINUniversity of Carthage Laboratory of Applied Mechanics and Engineering ENITDepartment of Mechanical engineering ENSITTunis University of Tunisia

A new strategy is presented to solve robust multi-physics multi-objective optimization problem known as improved multi-objective collaborative optimization （IMOCO） and its extension improved multi-objective robust collaborative （IMORCO）. In this work, the proposed IMORCO approach combined the IMOCO method, the worst possible point （WPP） constraint cuts and the Genetic algorithm NSGA-II type as an optimizer in order to solve the robust optimization problem of multi-physics of microstructures with uncertainties. The optimization problem is hierarchically decomposed into two levels： a microstructure level, and a disciplines levels, For validation purposes, two examples were selected： a numerical example, and an engineering example of capacitive micro machined ultrasonic transducers （CMUT） type. The obtained results are compared with those obtained from robust non-distributed and distributed optimization approach, non-distributed multi-objective robust optimization （NDMORO） and multi-objective collaborative robust optimization （McRO）, respectively. Results obtained from the application of the IMOCO approach to an optimization problem of a CMUT cell have reduced the CPU time by 44% ensuring a Pareto front close to the reference non-distributed multi-objective optimization （NDMO） approach （mahalanobis distance, D2M =0.9503 and overall spread, So=0.2309）. In addition, the consideration of robustness in IMORCO approach applied to a CMUT cell of optimization problem under interval uncertainty has reduced the CPU time by 23% keeping a robust Pareto front overlaps with that obtained by the robust NDMORO approach （D2M =10.3869 and So=0.0537）.

关键词： multi-physics multi-objective optimization robust optimization collaborative optimization non-distributed anddistributed optimization uncertainty interval

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Assessment of Phytochemical Analysis,Nutritional Composition and Antimicrobial Activity of Moringa oleifera

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Phyton-International Journal of Experimental Botany 2022年第8期91卷 1817-1829页

作者： Naima Asghar Abida Aziz Muhammad Farooq Azhar mohamed El-Sharnouby Uzma Irfan Iqra Rafiq Husnain Farooq Muhammad Ishaq Asif Rehmani mohamed I.Sakran A.Altalhi fahad M.Alzuaibr Ayman El Sabagh Department of Botany The Women UniversityMultan66000Pakistan Department of Forestry and Range Management Bahauddin Zakariya UniversityMultan60800Pakistan Department of Biotechnology College of ScienceTaif UniversityTaif21944Saudi Arabia Department of Environmental Sciences University of CaliforniaRiverside92521USA Department of Forestry Rangeand WildlifeGhazi UniversityDera Ghazi Khan32200Pakistan Department of Agronomy Ghazi UniversityDera Ghazi Khan32200Pakistan Biochemistry Department Faculty of ScienceUniversity of TabukTabuk47512Saudi Arabia Biology Department Faculty of ScienceTaif UniversityTaif21944Saudi Arabia Department of Biology Faculty of ScienceUniversity of TabukTabuk71491Saudi Arabia Department of Agronomy Faculty of AgricultureUniversity of KafrelsheikhKafr Elsheikh33516Egypt

Moringa oleifera is a miracle plant rich in nutrients,antioxidants,and antibiotic *** study was designed to evaluate various biochemical attributes of leaves and flowers of *** parts(leaves,flowers)of ***,collected from different roadsides of Multan district,Punjab,Pakistan,were used as experimental *** indicates that alkaloids,saponin,carbohydrates,fats,and protein had a high value in the aqueous extract of both leaves and flowers of *** phenol content was high in methanolic leaves extract and the phenol contents were high in aqueous extract of *** extract yield of *** leaves and flowers both showed a higher percentage in aqueous extract(57.5%),followed by methanol extract and lowest in ethyl acetate *** contents were higher in ethyl acetate extract of leaves(33.67%)and aqueous extract of flowers(53.71%).While crude fiber was high in methanolic extract of leaves(12.40%)and in flowers crude fiber was high in ethyl acetate extract(15.86%).The moisture contents were higher in leaves(8.87%)than flowers(7.3%)and similarly,ash percentage in flowers(52.60%)than leaves(41.84%).Ethyl acetate extracts of *** leaves show antibacterial activity against Pseudomonas aeruginosa while methanolic extract of *** flowers shows antibacterial activity against Xanthomonas *** growth inhibits show in all extracts of leaves against Aspergillus flavus,***,and *** except for the concentrated aqueous extract of *** in flowers maximum growth inhibits all extracts against ***,***,and *** except the diluted ethyl acetate *** present in different parts of moringa have significant edible and commercial *** extracts exhibited significant antimicrobial activity,therefore have applications in pharmaceuticals.

关键词： Antifungal antioxidants phytochemical antibacterial phenolics plant extract medicinal properties

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Static and dynamic stability responses of multilayer functionally graded carbon nanotubes reinforced composite nanoplates via quasi 3D nonlocal strain gradient theory

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Defence Technology（防务技术） 2022年第10期18卷 1778-1809页

作者： Ahmed Amine Daikh mohamed Sid Ahmed Houari mohamed Ouejdi Belarbi Salwa A.mohamed mohamed A.Eltaher Laboratoire D'Etude des Structures et de Mecanique des Materiaux Departement de Genie CivilFacultedes Sciences et de La TechnologieUniversite Mustapha Stambouli B.P.305R.P.29000MascaraAlgeria Laboratoire de Genie Energetique et Materiaux LGEMUniversite de BiskraB.P.145R.P07000BiskraAlgeria Department of Engineering Mathematics Zagazig UniversityP.O.Box 44519ZagazigEgypt Faculty of Engineering Mechanical Engineering DepartmentKing Abdulaziz UniversityP.O.Box 80204JeddahSaudi Arabia Faculty of Engineering Mechanical Design and Production DepartmentZagazig UniversityP.O.Box 44519ZagazigEgypt

This manuscript presents the comprehensive study of thickness stretching effects on the free vibration,static stability and bending of multilayer functionally graded(FG)carbon nanotubes reinforced composite(CNTRC)*** nanoscale and microstructure influences are considered through a modified nonlocal strain gradient continuum *** on power-law functions,four different patterns of CNTs distribution are considered in this analysis,a uniform distribution UD,FG-V CNTRC,FG-X CNTRC,and FG-O CNTRC.A 3D kinematic shear deformation theory is proposed to include the stretching influence,which is neglected in classical ***'s principle is applied to derive the governing equations of motion and associated boundary *** solutions are developed based on Galerkin method to solve the governing equilibrium equations based on the generalized higher-order shear deformation theory and the nonlocal strain gradient theory and get the static bending,buckling loads,and natural frequencies of *** with previous works is presented.A detailed parametric analysis is carried out to highlight the impact of thickness stretching,length scale parameter(nonlocal),material scale parameter(gradient),CNTs distribution pattern,geometry of the plate,various boundary conditions and the total number of layers on the stresses,deformation,critical buckling loads and vibration *** new results are also reported in the current study,which will serve as a benchmark for future research.

关键词： 3D shear deformation theory Free vibration Buckling Bending Galerkin method Functionally graded nanotube Nonlocal strain gradient theory

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Mild Solutions of a Class of Conformable Fractional Differential Equations with Nonlocal Conditions

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Acta Mathematicae Applicatae Sinica 2023年第2期39卷 249-261页

作者： mohamed BOUAOUID Sultan Moulay Slimane University Faculty of Sciences and TechnicsDepartment of MathematicsBP 52323000Beni MellalMorocco

This paper deals with the existence,uniqueness and continuous dependence of mild solutions for a class of conformable fractional differential equations with nonlocal initial *** results are obtained by means of the cl... 详细信息

关键词： fractional partial differential equations fractional derivatives and integrals cosine family of linear operators nonlocal conditions

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Heat transfer of copper/water nanofluid flow through converging-diverging channel

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Journal of Central South University 2016年第2期23卷 484-496页

作者： mohamed Rafik SARI mohamed KEZZAR Rachid ADJABI Mechanical Engineering Department University of Skikda Industrial Mechanics Laboratory Badji-Mokhtar University of Annaba

The main objective of this work is to investigate analytically the steady nanofluid flow and heat transfer characteristics between nonparallel plane walls. Using appropriate transformations for the velocity and temperature, the basic nonlinear partial differential equations are reduced to the ordinary differential equations. Then, these equations have been solved analytically and numerically for some values of the governing parameters, Reynolds number, Re, channel half angle, α, Prandtl number, Pr, and Eckert number, Ec, using Adomian decomposition method and the Runge-Kutta method with mathematic package. Analytical and numerical results are searched for the skin friction coefficient, Nusselt number and the velocity and temperature profiles. It is found on one hand that the Nusselt number increases as Eckert number or channel half-angle increases, but it decreases as Reynolds number increases. On the other hand, it is also found that the presence of Cu nanoparticles in a water base fluid enhances heat transfer between nonparallel plane walls and in consequence the Nusselt number increases with the increase of nanoparticles volume fraction. Finally, an excellent agreement between analytical results and those obtained by numerical Runge-Kutta method is highly noticed.

关键词： nanofluid flow heat transfer copper nanoparticles inclined walls analytical solution

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Completed Tensor Product and Flatness

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Algebra Colloquium 2020年第3期27卷 599-606页

作者： mohamed Tabaa Department of Mathematics Faculty of Sciences Mohammed v University in RabatMorocco

We give,in a more general case than the Noetherian case,an answer to the question posed by Shaul on the flatness of the completed tensor product.

关键词： preadic topology completed tensor product coherent ring flat module

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A Survey of Racks and Quandles:Some Recent Developments

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Algebra Colloquium 2020年第3期27卷 509-522页

作者： mohamed Elhamdadi Department of Mathematics University of South Florida TampaFL 33620USA

This short survey contains some recent developments of the algebraic theory of racks and *** report on some elements of representation theory of quandles and ring theoretic approach to quandles.

关键词： rack quandle representation ring isomorphism

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An Enhanced Lung Cancer Detection Approach Using Dual-Model Deep Learning Technique

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 835-867页

作者： Sumaia mohamed Elhassan Saad mohamed Darwish Saleh Mesbah Elkaffas Department of Information Technology Institute of Graduate Studies and ResearchAlexandria UniversityAlexandria21526Egypt College of Computing and Information Technology Arab Academy for ScienceTechnology and Maritime TransportAlexandriaP.O.Box 1029Egypt

Lung cancer continues to be a leading cause of cancer-related deaths worldwide,emphasizing the critical need for improved diagnostic *** detection of lung tumors significantly increases the chances of successful treatment and ***,current diagnostic methods often fail to detect tumors at an early stage or to accurately pinpoint their location within the lung ***-model deep learning technologies for lung cancer detection,while beneficial,cannot capture the full range of features present in medical imaging data,leading to incomplete or inaccurate ***,it may not be robust enough to handle the wide variability in medical images due to different imaging conditions,patient anatomy,and tumor *** overcome these disadvantages,dual-model or multi-model approaches can be *** research focuses on enhancing the detection of lung cancer by utilizing a combination of two learning models:a Convolutional Neural Network(CNN)for categorization and the You Only Look Once(YOLOv8)architecture for real-time identification and pinpointing of *** automatically learn to extract hierarchical features from raw image data,capturing patterns such as edges,textures,and complex structures that are crucial for identifying lung ***8 incorporates multiscale feature extraction,enabling the detection of tumors of varying sizes and scales within a single *** is particularly beneficial for identifying small or irregularly shaped tumors that may be challenging to ***,through the utilization of cutting-edge data augmentation methods,such as Deep Convolutional Generative Adversarial Networks(DCGAN),the suggested approach can handle the issue of limited data and boost the models’ability to learn from diverse and comprehensive *** combined method not only improved accuracy and localization but also ensured efficient real-time processing,which is crucial for practical clinical applicati

关键词： Lung cancer detection dual-model deep learning technique data augmentation CNN YOLOv8

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Anti-wear properties evaluation of frictional sliding interfaces in automobile engines lubricated by copper/graphene nanolubricants

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Friction 2020年第5期8卷 905-916页

作者： mohamed Kamal Ahmed ALI Xianjun HOU mohamed AAABDELKAREEM Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Automotive and Tractors Engineering Department Faculty of EngineeringMinia UniversityEl-Minia 61111Egypt Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan 430070China

Owing to the significance of improving fuel economy, reducing emissions, and extending the durability of engine components, this study focused on the tribological performance of nano-additives. In this study, copper (Cu) and graphene (Gr) nanomaterials were dispersed in a fully formulated engine oil (5W-30) with different concentrations. The tribological trials were investigated under various speeds and loads, utilizing a reciprocating tribometer to mimic the ring/liner interfaces in the engine. The frictional surface morphologies were com-prehensively analyzed using electron probe X-ray microanalysis (EPMA), field emission scanning electron microscopy (FESEM), energy dispersive spectrometer (EDS), and three dimensional (3D) surface profilometry to explore the mechanisms responsible for improving the tribological performance of the frictional sliding parts in the engine. The tribological test results illustrated that lubrication by nano-additives reduced the wear rate (WR) and friction coefficient (COF) by 25%–30% and 26.5%–32.6%, respectively, as compared with 5W-30. The results showed that this is a promising approach for increasing the durability and lifespan of frictional sliding components and fuel economy in automobile engines.

关键词： engine tribology nanomaterial nanolubricant friction wear tribofilm

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Robust design and analysis for opto-mechanical two array laser warning system

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Defence Technology（防务技术） 2023年第9期27卷 46-52页

作者： Mazhar Tayel mohamed Shehata mohamed Mabrouk Abdlarhman Adel mohamed Shady Shokry Mostafa Alshershby Faculty of Engineering Alexandria UniversityAlexandriaEgypt Egyptian Air Defense Collage AlexandriaEgypt Laser and Optoelectronics Department Technical Research CenterEgypt

In the past three decades,laser warning systems(LWS)have emerged in great importance,as the development of laser-guided weapons,such as airborne Hellfire missiles,has increased,posing an imminent threat to vital areas and *** laser warning station(LWS)can detect,classify,identify,and give alarm from laser threat at a very short time with high ***,the designers of this system must take into account the detectability and field of view to cover the area to be *** main contribution in this research is an analytical design of LWS that consists of 24 detector elements,distributed in two arrays(2×12)***,calculating the best distance between the detectors according to the laser beam spot *** addition,enhancement laser warring sensor detection capability and detection performance FOV between the detectors to increase coverage area up to 360°.Moreover,decreasing dead zone area between the laser detectors *** calculations and illustrations made to reach the best systematic design.

关键词： LWS Field of view Detector elements

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