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Journal of Ocean Engineering and Science 2022年第4期7卷 321-326页

作者： H.I.Abdel-Gawad m.tantawy m.S.mani Rajan Department of mathematics Faculty of ScienceCairo UniversityGizaEgypt Department of Basic Sciences Faculty of EngineeringOctober 6 UniversityGizaEgypt Department of Physics University College of EngineeringAnna UniversityRamanathapuramIndia

The oscillatory motion on the ocean surface is a combination of a variety of different types of *** regularized waves are among ***,it is shown that they arise as solutions of the(1+2)-dimensional Benjamin-Bona-mahony equation(BBmE).Numerous works on(1+1)-dimensional BBmE were carried in the *** this paper,we consider the(1+2)-dimensional non-autonomous BBmE,with time-dependent *** model equation is completely *** objective is to find the exact solutions and investigate the relevant *** solve this issue,the extended unified method is used to find the exact solutions in the form of semi-self similar and self similar *** solve this issue,simi-larity transformations are ***,the generalized unified methods(GUm)are also used in the symbolic *** numerical results of these solutions are evaluated and are shown *** wave patterns of regularized waves in shallow water,near ocean shores,are ***-tory waves and vector of lumps with troughs are *** time-dependent coefficients are used,here,to control the different wave patterns that take the forms of the multi-U shaped wave with basins with a *** pattern formation occurs,which is in the form of two layers of lumps with *** tunneling is also *** waves patterns are *** stability of the steady state solutions is *** is found that the stability depends significantly on the dispersion coefficient.

关键词： (1+2)-dimensional Benjamin-Bona-mahony equation Extended unified method Wave patterns Similariton solutions

multiple scales method for analyzing a forced damped rotational pendulum oscillatorwithgallows

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Communications in Theoretical Physics 2024年第5期76卷 58-67页

作者： Haifa A Alyousef Alvaro H Salas B m Alotaibi S A El-tantawy Department of Physics College of SciencePrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh 11671Saudi Arabia Department of mathematics and Statistics Universidad Nacional de ColombiaFIZMAKO Research GroupColombia Department of Physics Faculty of SciencePort Said UniversityPort Said 42521Egypt Research Center for Physics(RCP) Department of PhysicsFaculty of Science and ArtsAl-MikhwahAl-Baha UniversityAl-Baha 1988Saudi Arabia

This study reports the analytical solution for a generalized rotational pendulum system with gallows and periodic excited *** multiple scales method(mSm)is applied to solve the proposed *** types of rotational pendulum oscillators are studied and talked about in *** include the forced damped rotating pendulum oscillator with gallows,the damped standard simple pendulum oscillator,and the damped rotating pendulum oscillator without *** mSm first-order approximations for all the cases mentioned are derived in *** obtained results are illustrated with concrete numerical *** first-order mSm approximations are compared to the fourth-order Runge-Kutta(RK4)numerical ***,the maximum error is estimated for the first-order approximations obtained through the mSm,compared to the numerical approximations obtained by the RK4 ***,we conducted a comparative analysis of the outcomes obtained by the used method(mSm)and He-mSm to ascertain their respective levels of *** proposed method can be applied to analyze many strong nonlinear oscillatory equations.

关键词： rotational pendulum system multiple scales method approximate solution damped oscillations forced pendulum with gallows he-multiple scales method

Thermomagnetic viscoelastic responses in a functionally graded hollow structure

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Acta mechanica Sinica 2011年第4期27卷 567-577页

作者： m.N.m.Allam R.tantawy mathematics Department Faculty of ScienceMansoura University

This paper presents an analytical solution for the interaction of electric potentials, electric displacements, elastic deformations, and thermoelasticity, and describes electromagnetoelastic responses and perturbation of the magnetic field vector in hollow structures （cylinder or sphere）, subjected to mechanical load and electric potential. The material properties, thermal expansion coefficient and magnetic permeability of the structure are assumed to be graded in the radial direction by a power law distribution. In the present model we consider the solution for the case of a hollow structure made of viscoelastic isotropic material, reinforced by elastic isotropic fibers, this material is considered as structurally anisotropic material. The exact solutions for stresses and perturbations of the magnetic field vector in FGm hollow structures are determined using the infinitesimal theory of magnetothermoelasticity, and then the hollow structure model with viscoelastic material is solved using the correspondence principle and Illyushin＇s approximation method. Finally, numerical results are carried out and discussed.

关键词： Functionally graded material Viscoelasticity Perturbation of magnetic field vector magnetoelasticity

Hydration Characteristics and Immobilization of Cr(Ⅵ) in Slag Cement-CKD Pastes under Hydrothermal Treatment

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Journal of Wuhan University of Technology(materials Science) 2015年第5期30卷 1013-1019页

作者： m R Shatat Gomaa A m Ali m A tantawy Chemistry Department Faculty of Science Al-Azhar University Faculty of Industrial Science and Technology University Malaysia Pahang (UMP) Chemistry Department Faculty of Science Minia University

The effect of hydrothermal curing regimes on the hydration characteristics of slag cement containing different ratios of cement kiln dust has been studied. The samples for this study were combination of slag cement and cement kiln dust(5%-25%) without and with immobilization of 5% Cr(VI) by mass. Pastes were hydrothermally treated at 180 ℃ for different periods(2-24 h) in well closed stainless steel capsule. The hydration characteristics of these pastes were studied by measuring the compressive strength, bulk density, total porosity and combined water content. The findings were further supported by XRD and SEm analysis. The results indicated that the hydration characteristics of slag cement paste containing cement kiln dust 10% by mass were enhanced, especially at later ages(24 h) of hydration. That is due to the hydrothermal curing regimes of immobilized pastes accelerating hydration reactions and precipitation of Ca Cr O4, indicating that Cr(VI) can be solidified in the cement paste. This precipitation leads to pore formation in hydrated slag cement pastes.

关键词： hydrothermal immobilization slag cement CKD pastes

A new approach for modelling the damped Helmholtz oscillator:applications to plasma physics and electronic circuits

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Communications in Theoretical Physics 2021年第3期73卷 119-130页

作者： S A El-tantawy Alvaro H Salas m R Alharthi Department of Physics Faculty of SciencePort Said UniversityPort Said 42521Egypt Research Center for Physics(RCP) Department of PhysicsFaculty of Science and ArtsAl-MikhwahAl-Baha UniversitySaudi Arabia Department of mathematics Universidad National de ColombiaUniversidad National de Colombia-Nubia Campus Derpartment of Mathematics and Statistics FIZMAKO Research GroupColombia Department of mathematics and Statistics College of ScienceTaif UniversityPO Box 11099Taif 21944Saudi Arabia

In this paper,a new approach is devoted to find novel analytical and approximate solutions to the damped quadratic nonlinear Helmholtz equation(HE)in terms of the Weiersrtrass elliptic *** exact solution for undamped HE(integrable case)and approximate/semi-analytical solution to the damped HE(non-integrable case)are given for any arbitrary initial *** a special case,the necessary and sufficient condition for the integrability of the damped HE using an elementary approach is *** general,a new ansatz is suggested to find a semi-analytical solution to the non-integrable case in the form of Weierstrass elliptic *** addition,the relation between the Weierstrass and Jacobian elliptic functions solutions to the integrable case will be derived in ***,we will make a comparison between the semi-analytical solution and the approximate numerical solutions via using Runge-Kutta fourth-order method,finite difference method,and homotopy perturbation method for the first-two ***,the maximum distance errors between the approximate/semi-analytical solution and the approximate numerical solutions will be *** real applications,the obtained solutions will be devoted to describe the characteristics behavior of the oscillations in RLC series circuits and in various plasma models such as electronegative complex plasma model.

关键词： damped and undamped Helmholtz equation Korteweg-de Vries type equation plasma oscillations nonlinear RLC circuits Weierstrass ellliptic function periodical solution

Analysis of Functionally Graded Piezoelectric Cylinders in a Hygrothermal Environment

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Advances in Applied mathematics and mechanics 2014年第2期6卷 233-246页

作者： m.N.m.Allam A.m.Zenkour R.tantawy Department of mathematics Faculty of ScienceMansoura UniversityMansoura 35516Egypt Department of mathematics Faculty of ScienceKing Abdulaziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia Department of mathematics Faculty of ScienceKafrelsheikh UniversityKafr El-Sheikh 33516Egypt Department of mathematics Faculty of ScienceDamietta University34517Egypt

This paper presents an analytical solution for the interaction of electric potentials,electric displacement,elastic deformations,and describes hygrothermal effect responses in hollow and solid cylinders,subjected to mechanical load and electric *** solutions for displacement,stresses and electric potentials in functionally graded piezoelectric material are determined using the infinitesimal *** material properties coefficients of the present cylinder are assumed to be graded in the radial direction by a power law *** examples display the significant of influence of material *** is interesting to note that selecting a specific value of inhomogeneity parameter can optimize the piezoelectric hollow and solid cylinders responses,which will be of particular importance in modern engineering designs.

关键词： Functionally graded piezoelectric material hygrothermal effect.

maximizing the Benefit of Rate Transient Analysis for Gas Condensate Reservoirs

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Energy Engineering 2021年第5期118卷 1411-1423页

作者： mahmoud Abdo tantawy Ahmed A.m.Elgibaly Ahmed mohamed Farag Faculty of Petroleum and mining Engineering Suez UniversitySuezEgypt Abu Qir Petroleum Company AlexandriaEgypt

In recent years,many trials have been made to use the Rate Transient Analysis(RTA)techniques as a method to describe the gas condensate *** problem with using these techniques is the multi-phase behavior of the gas condensate ***,the Pressure Transient Analysis(PTA)is commonly used in this case to analyze the reservoir *** this paper,we are going to compare the results of both PTA and RTA of three wells in gas condensate *** comparison showed a great match between the results of the two mentioned techniques for the first time using a reference GOR of 75,000 SCF/***,we concluded that we could depend on RTA instead of PTA to spare the cost associated with the PTA in the gas condensate reservoirs.

关键词： Rate transient analysis production data analysis well testing permeability skin factor gas condensate

On the dynamics of nonlinear propagation and interaction of the modified KP solitons in multicomponent complex plasmas

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Journal of Ocean Engineering and Science 2022年第6期7卷 555-564页

作者： muhammad Shohaib W.masood R.Jahangir m.Siddiq Sadah A.Alkhateeb S.A.El-tantawy COmSATS University Islamabad Islamabad CampusPark RoadChak ShahzadIslamabad 44000Pakistan National Center for Physics(NCP) Quaid-i-Azam University CampusShahdrah Valley RoadIslamabad44000Pakistan mathematics Department Faculty of ScienceUniversity of JeddahJeddahSaudi Arabia Department of Physics Faculty of SciencePort Said UniversityPort Said 42521Egypt Research Center for Physics(RCP) Department of PhysicsFaculty of Science and ArtsAl-MikhwahAl-Baha UniversitySaudi Arabia

Dust-acoustic waves(DAWs)are analyzed in the small amplitude limit in a collisionless unmagnetized dusty plasma whose constituents are inertial dust grains,massless ions expressed by the generalized(r,q)distribution and inertialess maxwellian electrons using the fluid theory of *** modified Kadomtsev-Petviashvili(mKP)equation is derived at a critical plasma condition for which the quadratic nonlinearity *** propagation of single soliton and interaction of two solitons are analyzed for the mKP equation in the context of plasma physics by employing Hirota bilinear *** effects of the flatness parameter rand tail parameter q of the ions on the frequency of the DAWs are studied and the comparison with maxwellian and kappa distributions is *** the plasma parameters corresponding to the Saturn’s E-ring,the range of electric field amplitude for dust-acoustic solitary waves(DASWs)for different ion distributions is calculated and is shown to agree very well with the Cassini Wideband Receiver(WBR)*** interaction time of two DASWs for non-maxwellian ion distributions is estimated and shown to be fastest for the(r,q)distributed *** interesting feature of the interaction between compressive solitons with their rarefactive counterparts is also discussed in detail.

关键词： Non-maxwellian complex plasmas Dust-acoustic solitary waves Hirota bilinear method modified Kadomtsev-Petviashvili equation Solitons interaction

Enhancing the explosive characteristics of a Semtex explosive by involving admixtures of BCHmX and HmX

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Defence Technology（防务技术） 2020年第2期16卷 487-492页

作者： Ahmed Elbeih Ahmed K.Hussein Tamer Elshenawy Svatopluk Zeman Sara m.Hammad Ahmad Baraka mohamed A.Elsayed mohamed Gobara Hesham.tantawy military Technical College Kobry ElkobbahCairoEgypt Technical Research Center CairoEgypt Institute of Energetic materials Faculty of Chemical TechnologyUniversity of PardubiceCzech Republic Faculty of Pharmacy University of CairoGizaEgypt

A well-known ternary plastic explosive,Czech Semtex 1H,contains a mixture of PETN and RDX softened by *** this work,BCHmX was used to replace PETN in Semtex 1H to form Sem-BC+*** addition,another mixture based on BCHmX and HmX as energetic fillers bonded by the polymeric matrix of Semtex 1H(Sem-BC+HmX)was *** particle size distribution of each individual explosive was determined to obtain the optimum mixing *** and impact sensitivities were *** velocity of detonation was reported practically and the detonation properties were calculated by EXPLO5 *** explosive strength of each sample was measured by the ballistic mortar *** conclusion confirms that the velocity of detonation of Sem-BC+HmX was the highest in comparison with the prepared ***-BC+RDX has the least impact and frictions ***-BC+RDX has higher detonation velocity,detonation properties and explosive strength than Semtex *** of BCHmX in Semtex 1H as a replacement for PETN is the candidate to produce a high performance advanced Czech plastic explosive.

关键词： Semtex Explosives Combustion Sensitivity Detonation Explosive strength