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Dynamic modeling of a three-dimensional braided composite thin plate considering braiding directions

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Applied mathematics and mechanics(English Edition) 2025年第1期46卷 123-138页

作者： Chentong GAO Huiyu SUN Jianping GU W.m.HUANG College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics School of mechanical and Aerospace Engineering Nanyang Technological University Jiangsu Key Laboratory of Advanced Structural materials and Application Technology School of Materials Science and EngineeringNanjing Institute of Technology

Currently, there are a limited number of dynamic models available for braided composite plates with large overall motions, despite the incorporation of three-dimensional(3D) braided composites into rotating blade components. In this paper, a dynamic model of 3D 4-directional braided composite thin plates considering braiding directions is established. Based on Kirchhoff's plate assumptions, the displacement variables of the plate are expressed. By incorporating the braiding directions into the constitutive equation of the braided composites, the dynamic model of the plate considering braiding directions is obtained. The effects of the speeds, braiding directions, and braided angles on the responses of the plate with fixed-axis rotation and translational motion, respectively, are investigated. This paper presents a dynamic theory for calculating the deformation of 3D braided composite structures undergoing both translational and rotational motions. It also provides a simulation method for investigating the dynamic behavior of non-isotropic material plates in various applications.

关键词： three-dimensional (3D) braided composite braiding direction composite thin plate large overall motion dynamic model O313.7

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系统分析和政策科学

系统分析和政策科学

Transient Performance of an Isolated Induction Generator under Unbalanced Loading Conditions

作者： r.m.克朗(r.m.Krone)

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Journal of Energy and Power Engineering 2010年第5期4卷 52-57页

作者： A. Alsalloum r.m. Hamouda A.I. Alolah A.m. Eltamaly Electrical Engineering Depar.m.nt King Saud University Riyadh 11421 Saudi Arabia

This paper presents a new transient model ofa standalone （isolated） self excited induction generator （SEIG）. This model is based on direct phase quantities and is suitable to study the performance of the generator under any balanced or unbalanced conditions. It includes a general load as well as general excitation capacitor.m.del. The model has the advantage of connecting or disconnecting the neutral points of the generator electrical system with both excitation capacitors and load. Furthermore, a more accurate magnetization curve is used. moreover, the simulation results have been verified exper.m.ntally.

关键词： Self excited induction generator transient performance SEIG unbalance.

Emerging role of A-kinase anchoring protein 5 signaling in reward circuit function

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Neural regeneration research 2025年第10期20卷 2913-2914页

作者： William J.Flerlage mark L.Dell’Acqua Brian m.Cox Fereshteh S.Nugent Uniformed Services University of the Health Sciences Department of Pharmacology and Molecular TherapeuticsBethesdaMDUSA Depar.m.nt of Pharmacology University of Colorado School of MedicineAnschutz Medical CampusAuroraCOUSA

There is a strong evidence supporting the hypothesis of synaptic dysfunction as a major contributor to neural circuit and network disruption underlying emotional and mood dysregulation in psychiatric disorders(Simmons et al.,2024).Diverse sets of distinct molecular signaling pathways converge on the synapse to regulate synaptogenesis,synaptic function,and synaptic plasticity in brain regions and circuits through complex interactions organized by numerous multivalent protein scaffolds,including the family of proteins known as A-kinase anchoring proteins(AKAPs).

关键词： function supporting

Comparative study of mo2Ga2C with superconducting mAX phase mo2GaC： First-principles calculations

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Chinese Physics B 2017年第3期26卷 297-302页

作者： m A Ali m r Khatun NJahan m m Hossain Depar.m.nt of Physics Chittagong University of Engineering and Technology Chittagong 4349 Bangladesh Depar.m.nt of Physics University of Rajshahi Rajshahi 6205 Bangladesh

The structural, electronic, optical and thermodynamic properties of mo2Ga2C are investigated using density func- tional theory （DFT） within the generalized gradient approximation （GGA）. The optimized crystal structure is obtained and the lattice par.m.ters are compared with available exper.m.ntal data. The electronic density of states （DOS） is calculated and analyzed. The metallic behavior for the compound is confirmed and the value of DOS at Fermi level is 4.2 states per unit cell per eV. Technologically important optical par.m.ters （e.g., dielectric function, refractive index, absorption coefficient, photo conductivity, reflectivity, and loss function） are calculated for the first time. The study of dielectric constant （ε1） indicates the Drude-like behavior. The absorption and conductivity spectra suggest that the compound is metallic. The reflectance spectr.m.shows that this compound has the potential to be used as a solar reflector. The thermodynamic properties such as the temperature and pressure dependent bulk modulus, Debye temperature, specific heats, and thermal expansion coefficient of mo2Ga2C mAX phase are derived fr.m.the quasi-harmonic Debye model with phononic effect also for the first time. Analysis of Tc expression using available par.m.ter values （DOS, Debye temperature, atomic mass, etc.） suggests that the compound is less likely to be superconductor.

关键词： first-principles calculations density of states (DOS) optical properties thermodynamic properties

Heat Transfer Augmentation in Developing Flow Through a ribbed Square Duct

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Journal of Thermal Science 2006年第3期15卷 251-256页

作者： Khan r K Ali m.A.T Akhanda m.A.r Principal Polytechnic InstitutePotuakhaliBangladesh Depar.m.nt of mechanical Engineering Bangladesh University of Engineering and Technology(BUET)DhakaBangladesh Depar.m.nt of mechanical and Chemical Engineering Islamic University of Technology(IUT) OIC Gazipur-1704DhakaBangladesh

An exper.m.ntal study is conducted to investigate the heat transfer augmentation in developing turbulent flow through a ribbed square duct. The duct is made of 16r.m.thick bakelite sheet. The bottom surface of the ribbed wall having rib pitch to height ratio of 10 is heated by passing a c current to the heater placed under it. The uniform heating is controlled using a digital temperature controller and a variac. The results of ribbed duct are compared with the results of a smooth duct under the same exper.m.ntal conditions. It is observed that the heat transfer augmentation in ribbed duct is better than that of the smooth duct. At re=5.0× 10^4 , the mean temperature of air flowing through the ribbed duct increases by 2.45 percent over the smooth duct, whereas in the fibbed duct Nusselt number increases by 15.14 percent than that of the smooth duct with a 6 percent increase in pressure drop.

关键词： heat transfer square duct developing flow turbulent pr.m.ters

Linear and nonlinear torsional free vibration of functionally graded micro/nano-tubes based on modified couple stress theory

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Applied mathematics and mechanics(English Edition) 2016年第6期37卷 725-740页

作者： A.r.SETOODEH m.rEZAEI m.r.ZENDEHDEL SHAHrI Faculty of mechanical and Aerospace Engineering Shiraz University of Technology

The linear and nonlinear torsional free vibration analyses of functionmly graded micro/nuno-tubes （FGmTs） are analytically investigated based on the couple stress theory. The employed non-classical continuum theory contains one material length scale par.m.ter, which can capture the small scale effect. The FGmT model accounts for the through-radius power-law variation of a two-constituent material. Hamilton＇s principle is used to develop the non-classical nonlinear governing equation. To study the effect of the boundary conditions, two types of end conditions, i.e., fixed-fixed and fixed-free, are considered. The derived boundary value governing equation is of the fourthorder, and is solved by the homotopy analysis method （HAm）. This method is based on the Taylor series with an embedded par.m.ter and is capable of providing very good approximations by means of only a few terms, if the initial guess and the auxiliary linear operator are properly selected. The analytical expressions are developed for the linear and nonlinear natural frequencies, which can be conveniently used to investigate the effects of the dimensionless length scale par.m.ter, the material gradient index, and the vibration amplitude on the natural frequencies of FGmTs.

关键词： torsional vibration nonlinear vibration micro/nano-tube functionallygraded material (FGm) couple stress theory size effect

China Nonferrous metals Scientific and Technical Joint-Development Group (CNJDG)

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rare metals 1989年第2期9卷 73-73页

作者： r.m.

China Nonferrous metals Scientific and Technical Joint-Development Group(CNJDG)consists of thirty odd research,design institutions,universities,colleges,plants,mines,enterprisesand consulting companies(see attached list of membership units)CNJDG has a business executive organization—Nonferrous metals Scientific and TechnicalDevelopment Corporation(NSTDC)to suit client’s convenience.

关键词： China Nonferrous metals Scientific and Technical Joint-Development Group CNJDG

rice plant growth and yield: foliar application of plasma activated water

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Plasma Science and Technology 2021年第7期23卷 134-143页

作者： m m rASHID mamunur rASHID m m HASAN m r TALUKDEr Plasma Science and Technology Lab Department of Electrical and Electronic EngineeringUniversity of RajshahiRajshahi 6205Bangladesh Plant Pathology and mycology Lab Department of BotanyUniversity of RajshahiRajshahi 6205Bangladesh Plant Pathology Lab Department of Agronomy and Agricultural ExtensionUniversity of RajshahiRajshahi 6205Bangladesh

Plasma activated water(PAW)was prepared for 10 min to be applied one toﬁve times as a foliar spray to rice plants,to investigate plant growth,yield and the concentrations of total soluble protein and sugar in the rice grains *** results reveal that(1)the plant height,stem diameter,dry weight,chlorophyll and total carotene concentrations were improved by∼15%,∼25%,∼24%,∼47%and∼45%,respectively,with respect to control,(2)defense mechanisms of the plants treated with PAW were improved,(3)concentrations of total soluble protein and sugar were enhanced in the rice grains of PAW treated plants and(4)yield was increased by∼14%.

关键词： plasma agriculture plasma activated water rice plant growth rice yield total soluble protein