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Analysis of interlaminar stress and nonlinear dynamic response for composite laminated plates with interfacial damage

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Acta mechanica Sinica 2008年第6期24卷 709-720页

作者： F.h.Zhu .m.Fu College of mechanics and Aerospace Hunan University410082 ChangshaChina

By considering the effect of interfacial damage and using the variation principle, three-dimensional nonlinear dynamic governing equations of the laminated plates with interfacial damage are derived based on the general sixdegrees-of-freedom plate theory towards the accurate stress analysis. The solutions of interlaminar stress and nonlinear dynamic response for a simply supported laminated plate with interfacial damage are obtained by using the finite difference method, and the results are validated by comparison with the solution of nonlinear finite element method. In numerical calculations, the effects of interfacial damage on the stress in the interface and the nonlinear dynamic response of laminated plates are discussed.

关键词： Laminated plates Geometric nonlinearity Accurate stress analysis Interfacial damage Interlaminar stress Nonlinear dynamic response

Widely tunable linear-cavity multiwavelength fiber laser with distributed Brillouin scattering

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Chinese Optics Letters 2011年第3期9卷 51-53页

作者： m.Ajiya m.h.Al-mansoori m.A.mahdi Department of Electrical Engineering Faculty of TechnologyBayero University Faculty of Engineering Sohar University Wireless and Photonics Networks Research Center Faculty of EngineeringUniversiti Putra Malaysia

We demonstrate a multiple wavelength Brillouin/erbium fiber laser in a linear cavity *** laser cavity is made up of a fiber loop mirror on one end of the resonator and a virtual mirror generated from the distributed stimulated Brillouin scattering effect on the other *** to the weak reflectivity provided by the virtual mirror,self-lasing cavity modes are completely suppressed from the laser *** Brillouin pump and 1480-nm pump powers of 2 and 130 mW,respectively,11 channels of the demonstrated laser with an average total power of 7.13 dBm can freely be tuned over a span of 37-nm wavelength from 1530 to 1567 nm.

关键词： EDFA Widely tunable linear-cavity multiwavelength fiber laser with distributed Brillouin scattering dBm nm OSNR DCF SBS

An ab initio investigation of vibrational, thermodynamic, and optical properties of Sc_2AlC mAX compound

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Chinese Physics B 2016年第10期25卷 103-108页

作者： m A Ali m T Nasir m R Khatun A K m A Islam S h Naqib Department of Physics Chittagong University of Engineering and Technology Department of Arts & Sciences Bangladesh Army University of Science and Technology Department of Physics University of Rajshahi International Islamic University Chittagong

The structural vibrational, thermodynamical, and optical properties of potentially technologically important, weakly coupled mAX compound, Sc2 Al C are calculated using density functional theory(DFT). The structural properties of ScAlC are compared with the results reported earlier. The vibrational, thermodynamical, and optical properties are theoretically estimated for the first time. The phonon dispersion curve is calculated and the dynamical stability of this compound is investigated. The optical and acoustic modes are observed clearly. We calculate the helmholtz free energy(F), internal energy(E), entropy(S), and specific heat capacity(Cv) from the phonon density of states. Various optical parameters are also calculated. The reflectance spectrum shows that this compound has the potential to be used as an efficient solar reflector.

关键词： mAX compound phonon dispersion thermodynamical properties optical properties

A COUPLED SYSTEm OF INTEGRAL EQUATIONS IN REFLEXIVE BANACh SPACES

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Acta mathematica Scientia 2012年第5期32卷 2021-2028页

作者： A.m.A.El-Sayed h.h.G.hashem Faculty of Science Alexandria UniversityAlexandriaEgypt Collage of Science & Arts Qassim UniversityBuraidahSaudi Arabia

We present an existence theorem for at least one weak solution for a coupled system of integral equations of Volterra type in a reflexive Banach spaces relative to the weak topology.

关键词： weak solution Volterra integral equation coupled system

Astrophysical S-factor of the d（p,γ）~3 he process by effective field theory

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Chinese Physics C 2013年第4期37卷 51-56页

作者： h.Sadeghi h.Khalili m.Godarzi Department of Physics Faculty of ScienceArak University

We summarize the recent effective field theory （EFT） studies of low-energy electroweak reactions of astrophysical interest, relevant to big-bang nucleosynthesis. The zero energy astrophysical S（0） factor for the thermal proton radiative capture by deuteron is calculated with pionless EFT. The astrophysical S（0） factor is accurately determined to be S（0）=0.243 eV·b up to the leading order （LO）. At zero energies, magnetic transition m1 gives the dominant contribution. The m1 amplitude is calculated up to the LO. A good, quantitative agreement between theoretical and experimental results is found for all observables. The demonstrations of cutoff independent calculation have also been presented.

关键词： proton-deutron radiative capture effective field theory cross section astrophysical S-factor

Novel typology of accelerated carbonation curing:using dry and pre-soaked biochar to tune carbon capture and mechanical properties of cementitious mortar

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Biochar 2023年第1期5卷 621-640页

作者： h.W.Kua S.m.h.Tan Department of the Built Environment College of Design and EngineeringNational University of SingaporeSingaporeSingapore

One of the challenges of promoting accelerated carbonation curing(ACC)of concrete as a carbon sequestration strategy is ensuring that carbonation will not deteriorate mechanical *** study examined the mechanical strength,water sorptivity and carbonation efficiency of ten types of mortar containing dry or pre-soaked biochar subjected to internal and/or external *** results obtained enabled a typology of ACC to be proposed,in which the carbon dioxide absorption of mortar containing various types of CO_(2)-dosed biochar ranged between 0.022%and 0.068%per unit dosage *** particular,the mortar containing dry biochar dosed with carbon dioxide was the top candidate for concurrently increasing both compressive strength(54.9 mPa)and carbon dioxide absorption(0.055%per unit dosage hour).mortar containing pre-soaked biochar dosed with carbon dioxide was identified as a strategy that achieved the highest carbonation efficiency(0.068%per unit dosage hour),but it also reduced compressive strength(45.1 mPa).Collectively,the proposed typology offers a useful overview of the different ways by which biochar can be used to tune ACC in mortar,according to any technical constraints and/or intended functions of the carbonated concrete components.

关键词： Biochar Pre-soaked Carbonation effectiveness Carbonation efficiency Accelerated carbonation curing

Effect of samarium oxide on structural,optical and electrical properties of some alumino-borate glasses with constant copper chloride

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Journal of Rare Earths 2020年第7期38卷 770-775,I0004页

作者： m.S.Sadeq h.Y.morshidy Basic Sciences Dept. Faculty of EngineeringSinai Univ.45511Al-ArishEgypt

The glass system under study was prepared and examined using the melt quenching procedures and XRD to emphasize the amorphous nature,*** of the prepared solid glass system was performed by a spectrophotometer in wavelengths from 190 to 1099 *** traditional techniques and standard formulas,the density,molar volume,refractive index,optical band gap and the optical filter characteristics were determined,then the influence of samarium oxide on some properties like the structure and optical,also the electrical properties were dissected.A novel formula was proposed to estimate the refractive index from the optical energy *** obtained samples are good optical filters especially the sample that contains 0.8 mol% of Sm2 *** this sample has the utmost density,the least molar volume,the maximum transmittance,least refractive index,the highest optical band gap and the least dc conductivity.

关键词： Alumino borate glasses Samarium oxide Optical properties Rare earths

Vibration suppression of magnetostrictive laminated beams resting on viscoelastic foundation

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Applied mathematics and mechanics(English Edition) 2020年第8期41卷 1269-1286页

作者： A.m.ZENKOUR h.D.EL-ShAhRANY Department of mathematics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Department of mathematics Faculty of ScienceKafrelsheikh UniversityKafrelsheikh 33516Egypt Department of mathematics Faculty of ScienceBisha UniversityBisha 61922Saudi Arabia

The vibration suppression analysis of a simply-supported laminated composite beam with magnetostrictive layers resting on visco-Pasternak’s foundation is *** constant gain distributed controller of the velocity feedback is utilized for the purpose of vibration *** formulation of displacement field is proposed according to Euler-Bernoulli’s classical beam theory(ECBT),Timoshenko’s first-order beam theory(TFBT),Reddy’s third-order shear deformation beam theory,and the simple sinusoidal shear deformation beam ***’s principle is utilized to give the equations of motion and then to describe the vibration of the current *** on Navier’s approach,the solution of the dynamic system is *** effects of the material properties,the modes,the thickness ratios,the lamination schemes,the magnitudes of the feedback coefficient,the position of magnetostrictive layers at the structure,and the foundation modules are extensively studied and discussed.

关键词： vibration suppression laminated composite beam magnetostrictive material visco-Pasternak’s foundation

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Communications in Theoretical Physics 2010年第10期54卷 603-608页

作者： m.h.m.moussa Rehab m.El-Shiekh Department of mathematics Faculty of EducationAin Shams University

In this paper, the symmetry method has been carried over to the generalized variable coefficients Zakharov- Kuznetsov equation. The infinitesimal symmetries and the optimal system are deduced and from this optimal system seven basic fields are determined, and for every vector field in the optimal system the admissible forms of the coefficients are found and this also leads us to transform the given equation into partial differential equations in two variables. After using some referenced transformations the mentioned partial differential equations eventually reduce to ordinary differential equations. The search for solutions to those equations has yielded many exact solutions in most cases.

关键词： symmetry method the generalized variable coefficients Zakharov-Kuznetsov equation exact solutions