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Buckling analysis of shear deformable composite conical shells reinforced by Cnts subjected to combined loading on the two-parameter elastic foundation

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Defence technology（防务技术） 2022年第2期18卷 205-218页

作者： A.h.sofiyev n.Kuruoglu Department of Civil Engineering of Engineering Faculty Suleyman Demirel University32260IspartaTurkey Information technology Research and Application Center Member of Consultancy Board of ItRAC Center Istanbul Commerce UniversityBeyoglu34445IstanbulTurkey scientific Research Centers for Composition Materials of UnEC-Azerbaijan state Economic University 1001/BakuAzerbaijan Department of Civil Engineering of Faculty of Engineering and Architecture of Istanbul Gelisim University IstanbulTurkey

the main objective of this study is to investigate the buckling analysis of CCss reinforced by Cnts subjected to combined loading of hydrostatic pressure and axial compression resting on the twoparameter elastic foundation(t-P-EF).It is one of the first attempts to derive the governing equations of the CCss reinforced with Cnts,based on a generalized first-order shear deformation shell theory(FsDst)which includes shell-foundation *** adopting the extended mixing rule,the effective material properties of CCss reinforced by Cnts with linear distributions are approximated by introducing some efficiency *** carbon nanotube distribution in the matrix,*** distribution(U)and V and X-types linear distribution are taken into *** stability equations are solved by using the Galerkin procedure to determine the combined buckling loads(CBLs)of the structure selected *** numerical illustrations cover CBLs characteristics of CCss reinforced by Cnts in the presence of the ***,a parametric study is carried out to study the influences of the foundation parameters,the volume fraction of carbon nanotubes and the types of reinforcement on the CBLs.

关键词： nanocomposites Cnts Composite conical shells two-parameter elastic foundations Combined buckling loads shear deformation shell theories

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Differential response of injured and healthy retinas to syngeneic and allogeneic transplantation of a clonal cell line of immortalized olfactory ensheathing glia:a double-edged sword

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neural Regeneration Research 2025年第8期20卷 2395-2407页

作者： María norte-Muñoz María Portela-Lomba Paloma sobrado-Calvo Diana simón Johnny Di Pierdomenico Alejandro Gallego-Ortega Mar Pérez JoséMCabrera-Maqueda Javier sierra Manuel Vidal-sanz María teresa Moreno-Flores Marta Agudo-Barriuso Grupo de Investigación Oftalmología Experimental Departamento de OftalmologíaOptometríaOtorrinolaringología y Anatomía PatológicaFacultad de MedicinaUniversidad de MurciaInstituto Murciano de Investigación Biosanitaria(IMIB)Campus de Ciencias de la SaludMurciaSpain Experimental sciences Faculty Universidad Francisco de VitoriaPozuelo de AlarcónMadridSpain Anatomy Histology and Neuroscience DepartmentMedicine FacultyUniversidad Autónoma de MadridMadridSpain Center of neuroimmunology Service of NeurologyLaboratory of Advanced Imaging in Neuroimmunological DiseasesHospital Clínic of BarcelonaInstitut d’Investigacions Biomèdiques August Pi i Sunyer(IDIBAPS)and Universitat de BarcelonaBarcelonaSpain Medicine Faculty Universidad Francisco de VitoriaPozuelo de AlarcónMadridSpain

Olfactory ensheathing glia promote axonal regeneration in the mammalian central nervous system,including retinal ganglion cell axonal growth through the injured optic ***,it is unknown whether olfactory ensheathing glia also have neuroprotective *** ensheathing glia express brain-derived neurotrophic factor,one of the best neuroprotectants for axotomized retinal ganglion ***,we aimed to investigate the neuroprotective capacity of olfactory ensheating glia after optic nerve *** ensheathing glia cells from an established rat immortalized clonal cell line,tEG3,were intravitreally injected in intact and axotomized retinas in syngeneic and allogeneic mode with or without microglial inhibition or immunosuppressive *** and gene expression analyses were *** bulb-derived primary olfactory ensheathing glia and tEG3 express major histocompatibility complex classⅡ*** and syngenically transplanted tEG3 cells survived in the vitreous for up to 21 days,forming an *** axotomized retinas,only the allogeneic tEG3 transplant rescued retinal ganglion cells at 7 days but not at 21 *** these retinas,microglial anatomical activation was higher than after optic nerve crush *** intact retinas,both transplants activated microglial cells and caused retinal ganglion cell death at 21 days,a loss that was higher after allotransplantation,triggered by pyroptosis and partially rescued by microglial inhibition or ***,neuroprotection of axotomized retinal ganglion cells did not improve with these *** different neuroprotective properties,different toxic effects,and different responses to microglial inhibitory treatments of olfactory ensheathing glia in the retina depending on the type of transplant highlight the importance of thorough preclinical studies to explore these variables.

关键词： cell therapy immune recognition major histocompatibility complex class II(MhCII) neuroprotection olfactory ensheathing glia retinal ganglion cells

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Development of aluminum rheo-extrusion process using semi-solid slurry at low solid fraction

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transactions of nonferrous Metals society of China 2010年第9期20卷 1763-1768页

作者： t.RAttAnOChAIKUL s.JAnUDOM n.MEMOnGKOL J.WAnnAsIn Department of Mining and Materials Engineering Faculty of EngineeringPrince of Songkla University Department of Industrial Engineering Faculty of EngineeringPrince of Songkla University

An aluminum extrusion process is mainly used to fabricate long tubes, beams and rods for various applications. however, this process has a high production cost due to the need for investment of high-pressure machinery. the objective of this work is to develop a new semi-solid extrusion process using semi-solid slurry at low solid fractions. A laboratory extrusion system was used to fabricate aluminum rods with the diameter of 12 ram. the semi-solid metal process used in this study was the gas induced semi-solid （GIss） technique. to study the feasibility of the GIss extrusion process, the effects of extrusion parameters such as plunger speed and solid fi-action on the extrudability, microstructure, and mechanical properties of extruded samples were investigated. the results show that the plunger speed and solid fraction of the semi-solid metal need to be carefully controlled to produce complete extruded parts.

关键词： aluminum alloys extrusion semi-solid metal rheo-extrusion gas induced semi-solid (GIss)

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Biomass Industrial Effluent Effect on Carbohydrates,Aminoacids,nitrite and nitrite Enzyme Activities of Arachis hypogaea L.

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Agricultural sciences in China 2009年第2期8卷 203-215页

作者： P C nagajyoti n Dinakar s suresh Y Udaykiran C suresh t n V K V Prasad t Damodharam Department of Environmental sciences Sri Venkateswara University national Institute of nutrition Hyderabad Regional Agricultural Research station N.G. Ranga Agriculture University

the objectives of the present investigations are to see the effects of biomass power plant effluent on the carbohydrates, aminoacids, nitrite and nitrite enzyme activitiesand proline of Arachis hypogaea L. var tCGs 320 under controlled pot culture methods. Plants were cultivated with 25, 50, 75 and 100% of the effluent and a control without the effluent. the treatment of the crop with 25% of the effluent has shown stimulatory effect on all the biochemical parameters studied. Carbohydrates, starch, aminoacids, protein, nitrate and nitrite reductase enzymatic activities have increased in 10, 15, 20 DAs （days after sowing）. In 25 and 30 DAs all biochemical parameters have decreased, due to environmental factors （rainfall, temperature, humidity, etc.）. the present investigation clearly indicated that the biomass power plant effluent has stimulatory effect on all the biochemical contents at lower concentration, and at higher concentration they have deleterious effects.

关键词： biomass power plant effluent biochemical parameters Arachis hypogaea stimulatory effect

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Internal Flow simulation of high-Performance solid Rockets using a k-ω turbulence Model

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Journal of thermal science 2005年第2期14卷 114-119页

作者： V.R.sAnAL KUMAR h.D.KIM B.n.RAGhUnAnDAn t.sEtOGUChI s.RAGhUnAthAn Andong national University Andong 760-749 KoreaAndong National University Andong 760-749KoreaIndian Institute of Science Bangalore-560 012IndiaSaga University Honjo-machiSaga 840-8502JapanThe Oueen's University of Belfast Northern IrelandUK

For technological reasons many high-performance solid rocket motors are made from segmented propellant grains with non-uniform port geometry. In this paper parametric studies have been carried out to examine the geometric dependence of transient flow features in solid rockets with non-uniform ports. numerical computations have been carried out in an inert simulator of solid propellant rocket motor with the aid of a standard k-ω turbulence model. It was seen that the damping of the temperature fluctuation is faster in solid rocket with convergent port than with divergent port geometry. We inferred that the damping of the flow fluctuations using the port geometry is a meaningful objective for the suppression and control of the instability and/or pressure/thrust oscillations during the starting transient of solid rockets.

关键词： solid rockets pressure spike instability thrust oscillation turbulent separation.

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Molecular Dynamics simulation of tensile Deformation and Fracture of γ-tiAl with and without surface Defects

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Journal of Materials science & technology 2016年第10期32卷 1033-1042页

作者： h.n.Wu D.s.Xu h.Wang R.Yang Institute of Metal Research Chinese Academy of Sciences

Molecular dynamics simulation of uniaxial tension along [001] has been performed to study the influence of various surface defects on the initiation of plastic deformation and fracture of γ-tiAl single *** results indicate that brittle fracture occurs in perfect bulk; surfaces and edges will be detrimental to the strength of materials and provide dislocation nucleation site. the defects on surfaces and edges cause further weakening with various effects depending on defect type, size, position and orientation,while the edge dimples are the most influential. For γ-tiAl rods with surface dimples, dislocations nucleate from an edge of the rod when dimples are small, dimple dislocation nucleation occurs only when the dimples are larger than a strain rate dependent critical size. the dislocations nucleated upon [001]tension are super dislocations with Burger vectors 〈011] or 1/2 〈 112] containing four 1/6 〈 112 〉 partials. the effects of surface scratches are orientation and shape sensitive. scratches parallel to the loading direction have little influence, while sharp ones perpendicular to the loading direction may cause crack and thus should be avoided. this simulation also shows that, any type of surface defect would lower strength,and cause crack in some cases. But some may facilitate dislocation nucleation and improve ductility of tiAl if well controlled.

关键词： Intermetallic compounds superdislocation Fracture surface defects Molecular dynamics

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Relativistic symmetries of Deng Fan and Eckart potentials with Coulomb-like and Yukawa-like tensor interactions

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Chinese Physics B 2014年第10期23卷 45-55页

作者： Akpan n.Ikot s.Zarrinkamar B.h.Yazarloo h.hassanabadi theoretical Physics Group Department of Physics University of Port Harcourt Choba PMB 5323 Port Harcourt Nigeria Department of Basic sciences Garmsar Branch Islamic Azad University Garmsar Iran Department of Basic sciences Shahrood Branch Islamic Azad University Shahrood Iran

Relativistic symmetries of the Dirac equation under spin and pseudo-spin symmetries are investigated and a combina- tion of Deng-Fan and Eckart potentials with Coulomb-like and Yukawa-like tensor interaction terms are considered. the energy equation is obtained by using the nikiforov-Uvarov method and the corresponding wave functions are expressed in terms of the hypergeometric functions. the effects of the Coulomb and Yukawa tensor interactions are numerically discussed as well.

关键词： Deng-Fan potential Eckart potential nikiforov-Uvarov method spin and pseudo-spin symme-tries

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Peristaltic flow of Walter’s B fluid in endoscope

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Applied Mathematics and Mechanics(English Edition) 2011年第6期32卷 689-700页

作者： s.nADEEM n.s.AKBAR t.hAYAt A.A.hEnDI Department of Mathematics Quaid-i-Azam University Department of Physics Faculty of ScienceKing Saud University

the peristaltic flow of a Walter＇s B fluid in an endoscope is studied. the problem is modeled in a cylindrical coordinate system. the main theme of the present analysis is to study the endoscopic effects on the peristaltic flow of the Waiter＇s B fluid. to the best of the authors＇ knowledge, no investigation has been made so far in the literatures to study the Walter＇s B fluid in an endoscope. Analytical solutions axe obtained using the regular perturbation method by taking 5 as a perturbation parameter. the approximate analytical solutions for the pressure rise and friction forces are evaluated using numerical integration. the effects of emerging parameters of the Waiter＇s B fluid are presented graphically.

关键词： peristaltic flow Walter's B fluid endoscope perturbation solution.

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timoshenko beam model for chiral materials

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Acta Mechanica sinica 2018年第3期34卷 549-560页

作者： t.Y.Ma Y.n.Wang L.Yuan J.s.Wang Q.h.Qin Department of Mechanics Tianjin University school of Engineering Deakin University Research school of Engineering Australian National University

natural and artificial chiral materials such as deoxyribonucleic acid （DnA）, chromatin fibers, flagellar filaments, chiral nanotubes, and chiral lattice materials widely exist. Due to the chirality of intricately helical or twisted microstructures, such materials hold great promise for use in diverse applications in smart sensors and actuators, force probes in biomedical engineering, structural elements for absorption of microwaves and elastic waves, etc. In this paper, a timoshenko beam model for chiral materials is developed based on noncentrosymmetric micropolar elasticity theory. the governing equations and boundary conditions for a chiral beam problem are derived using the variational method and hamilton＇s principle. the static bending and free vibration problem of a chiral beam are investigated using the proposed model. It is found that chirality can significantly affect the mechanical behavior of beams, making materials more flexible compared with nonchiral counterparts, inducing coupled twisting deformation, relatively larger deflection, and lower natural frequency. this study is helpful not only for understanding the mechanical behavior of chiral materials such as DnA and chromatin fibers and characterizing their mechanical properties, but also for the design of hierarchically structured chiral materials.

关键词： timoshenko beam model Chiral material Chirality Deflection Microrotation

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Atomic-scale roles of Zn element in age-hardened AlMgsiZn alloys

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Journal of Materials science & technology 2021年第11期70卷 105-112页

作者： n.n.Jiao Y.X.Lai s.L.Chen P.Gao J.h.Chen Center for high-Resolution Electron Microscopy College of Materials Science&EngineeringHunan UniversityChangsha410082China Electron Microscopy Laboratory and International Center for Quantum Materials School of PhysicsPeking UniversityBeijing100871China

Adding alloying elements to improve the performances or the manufacturing processes of Al-Mg-si alloys has long been a serious issue in developing advanced automotive aluminum *** Zn element,among those promising ones,has demonstrated positive alloying effects on Al-Mg-si ***,the atomic-scale roles of Zn in an age-hardened Al-Mg-si-Zn alloy have not been adequately *** atomic-resolution electron microscopy,here we report the precise locations of Zn elements in all hardening precipitates involved and their alloying mechanism at the atomic scale when alloying the *** results show that Zn atoms enter all the major hardening phases to occupy specific featured atomic sites of the original elements,*** si1 and Mg2 sites in theβ’-2 phase,and modify their crystal structures,interfacial structures and morphologies in characteristic *** is revealed that for theβ’-phase,Zn atoms occupy unique atomic sites,whereas for other phases,they demonstrate similar behaviors as other additive alloying elements such as Ag and Cu do.

关键词： Al-Mg-si alloy Zn addition Precipitate Electron microscopy

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