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Numerical Study of Piles Group under Seismic Loading in Frictinal Soil—Inclination Effect

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Open Journal of Earthquake Research 2014年第1期3卷 15-21页

作者： Fadi Hage Chehade marwan sadek Douaa Bachir Civil Engineering Department Doctotral School of Sciences and Technology Lebanese University University Institute of Technology (Saida) & Modeling Center Beirut Lebanon Laboratory of Civil Engineering and GeoEnvironment University of Lille I Sciences and Technology Villeneuve d’Ascq France Numerical Center Doctoral School of Science and Technology Lebanese University Beirut Lebanon

Recent devastating earthquakes in some countries, such as Pakistan, Turkey, Algeria and China, call to the mind the high risk exposure of Lebanon which is located over an active seismic zone. Many experts shared the view that major seismic event may occur in Lebanon in the future. Moreover, many earthquakes, of low magnitudes between three and four, have been registered in Lebanon during 2008. These events have increased the anxiety of Lebanese people because of the poor quality of the constructions and their behavior under moderate or severe earthquake events. The efficient way to minimize seismic effects, material and human losses, is the prevention. The system piles-foundation is an appropriate way and widely used to ensure the stability of constructions when subjected to seismic excitation. It seems necessary to study the interaction of pile-foundation-pile-cap-structure in the case of non linear soil behavior and the interface pile-soil. The study will be also conducted by using measures recorded during real earthquakes for example in Turkey (Kocaeli, 1999). In this paper, we present a numerical modeling of the interaction of using FLAC3D software. According to soil behavior and pile inclination, parametric studies are also performed. The analysis of the results could give the better piles group configuration in order to minimize the seismic effect on the structures.

关键词： Frictional Soil Inclination Interaction Non Linear Numerical Modeling Piles Group

Delayed Coronary Ostial Stenosis after Surgical Aortic Valve Replacement and Root Enlargement Treated with Beating Heart On-Pump CABG

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World Journal of Cardiovascular Diseases 2023年第10期13卷 657-663页

作者： Majed Tolah marwan sadek Muhammed Tamim Yasser Elkady Cardiac Surgery Department Cardiac Center King Fahad Medical Military Complex Dhahran Saudi Arabia Cardiac Surgery Department Madinah Cardiac Center Madinah Saudi Arabia

Coronary ostial stenosis after surgical aortic valve replacement (SAVR) is a rare but potentially fatal complication. Surgeons must have a high level of vigilance regarding the presentation of acute myocardial ischemia, arrhythmia, and heart failure after AVR. According to most reports, this event can be time-dependent divided into two groups;early acute phase that mostly happens intraoperative during weaning of CPB or in early ICU stay, and late presentation usually appears 1 - 6 months post surgery. Here, we describe an unusual subacute presentation of right coronary ostial stenosis 12 days after SAVR, which was treated successfully with redo beating heart coronary artery bypass grafting (CABG).

关键词： Non-ST Elevation Myocardial Infarction Iatrogenic Complication Coronary Artery Disease Surgical Aortic Valve Replacement

Optimal control of thermoelastic beam vibrations by piezoelectric actuation

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控制理论与应用（英文版） 2013年第3期11卷 463-467页

作者： Ibrahim sadek marwan ABUKHALED Department of Mathematics and Statistics American University of Sharjah

This paper presents the vibrations suppression of a thermoelastic beam subject to sudden heat input by a single piezoelectric actuator. An optimization problem is formulated as the minimization of a quadratic functional in terms of displacement and velocity at a given time and with the least control effort. The solution method is based on a combination of modal expansion and variational approaches. The modal expansion approach is used to convert the optimal control of distributed parameter system into the optimal control of lumped parameter system. By utilizing the variational approach, an explicit optimal control law is derived and the determination of the corresponding displacement and velocity is reduced to solving a set of ordinary differential equations. Numerical results are presented to demonstrate the effectiveness and the applicability of the proposed method.

关键词： Modal expansion approach Optimal control Thermoelastic beam Piezoelectric actuation Variational approach

A Logarithmically Improved Regularity Criterion for the Supercritical Quasi-geostrophic Equations in Besov Space

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Acta Mathematicae Applicatae Sinica 2017年第3期33卷 679-686页

作者： sadek GALA Department of Mathematics University of MostaganemBox 227Mostaganem 27000Algeria

In this paper, we consider the logarithmically improved regularity criterion for the supercritical quasi-geostrophic equation in Besov space B ∞,∞ -r （R2）. The result shows that if 0 is a weak solutions satisfies ∫ 0 T ｜｜ θ （·,s）｜｜a/a-r B ∞,∞ -r /（1＋ln（e＋｜｜ ⊥（·,s）｜｜ L r2） ds〈∞ for some 0〈r〈a and 0〈a〈1,then θ is regular at t = T. In view of the embedding L 2/r M p 2/r B ∞,∞ -r with 2≤p〈2/r and 0≤r〈1, we see that our result extends the results due to [20] and [31].

关键词： quasi-geostrophic equations logarithmical regularity criterion Besov space

A Note on the Blow-up Criterion of Smooth Solutions to the 3D Incompressible MHD Equations

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Acta Mathematicae Applicatae Sinica 2012年第4期28卷 639-642页

作者： sadek GALA Department of Mathematics University of MostaganemBox 227Mostaganem 27000Algeria

In this note, we will give a new proof of the blow-up criterion of smooth solutions to the 3D incompressible magneto-hydrodynamic equations by a simple application of Gagliardo-Nirenberg＇ s inequality.

关键词： ideal MHD equations blow-up littlewood-paley decomposition besov space

REMARK ON THE BLOW-UP CRITERION OF STRONG SOLUTIONS TO THE NAVIER-STOKES EQUATIONS IN MULTIPLIER SPACES

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Acta Mathematica Scientia 2010年第5期30卷 1413-1418页

作者： sadek Gala Department of Mathematics University of Mostaganem

In this note, we prove that Xr （0 〈 r 〈 1） norm of the vorticity controls the blow-up phenomena of strong solutions to the Navier-Stokes equations in R3.

关键词： Navier-Stokes equation blow-up criterion a priori estimates

A Remark on the Beale-Kato-Majda Criterion for the 3D MHD Equations with Zero Kinematic Viscosity

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Acta Mathematicae Applicatae Sinica 2012年第2期28卷 209-214页

作者： sadek GALA Xiao-chun CHEN Department of Mathematics University of Mostaganem Box 227 Mostaganem 27000 Algeria Department of Mathematics Chonqing Three Gorges University Wanzhou 404000 China

In this paper, we study the blow-up criterion of smooth solutions to the 3D magneto-hydrodynamic system in B^0∞,∞. We show that a smooth solution of the 3D MHD equations with zero kinematic viscosity in the whole sp... 详细信息

关键词： Magneto-hydrodynamic equations with zero viscosity B^0∞,∞ space blow-up criterion

Fractional Order Modeling of Predicting COVID-19 with Isolation and Vaccination Strategies in Morocco

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Computer Modeling in Engineering & Sciences 2023年第8期136卷 1931-1950页

作者： Lakhlifa sadek Otmane sadek Hamad Talibi Alaoui Mohammed S.Abdo Kamal Shah Thabet Abdeljawad Laboratory of Engineering Sciences for Energy National School of Applied SciencesChouaib Doukkali UniversityEl Jadida10002Morocco Department of Mathematics Faculty of SciencesChouaib Doukkali UniversityEl Jadida10002Morocco Department of Mathematics Hodeidah UniversityAl-Hudaydah91911Yemen Department of Mathematics and Sciences Prince Sultan UniversityRiyadh11586Saudi Arabia Department of Mathematics University of MalakandChakdara Dir(L)Khyber Pakhtankhawa18000Pakistan Department of Medical Research China Medical UniversityTaichung40402Taiwan

In this work,we present a model that uses the fractional order Caputo derivative for the novel Coronavirus disease 2019(COVID-19)with different hospitalization strategies for severe and mild cases and incorporate an awareness *** generalize the SEIR model of the spread of COVID-19 with a private focus on the transmissibility of people who are aware of the disease and follow preventative health measures and people who are ignorant of the disease and do not follow preventive health ***,individuals with severe,mild symptoms and asymptomatically infected are also *** basic reproduction number(R0)and local stability of the disease-free equilibrium(DFE)in terms of R0 are ***,the uniqueness and existence of the solution are *** simulations are performed by using some real values of ***,the immunization of a sample of aware susceptible individuals in the proposed model to forecast the effect of the vaccination is also ***,an investigation of the effect of public awareness on transmission dynamics is one of our aim in this ***,a prediction about the evolution of COVID-19 in 1000 days is *** the qualitative theory of the existence of a solution,we use some tools of nonlinear analysis,including Lipschitz ***,for the numerical interpretation,we use the Adams-Moulton-Bashforth *** the numerical results are presented graphically.

关键词： Fractional calculus caputo derivatives COVID-19 reproduction number future prediction

ON THE REGULARITY CRITERIA OF THE 3D NAVIER-STOKES EQUATIONS IN CRITICAL SPACES

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Acta Mathematica Scientia 2011年第2期31卷 591-600页

作者：董柏青 sadek Gala 陈志敏 School of Mathematical Sciences Anhui University Department of Mathematics University of Mostaganem School of Engineering Sciences University of Southampton

Regularity criteria of Leray-Hopf weak solutions to the three-dimensional Navier-Stokes equations in some critical spaces such as Lorentz space, Morrey space and multiplier space are derived in terms of two partial de... 详细信息

关键词： Regularity criteria Navier-Stokes equations