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Com.ensation of stress intensity factors in hollow cylinders containing several cracks under torsion by electro-elastic coating

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Applied m.them.tics and m.chanics(English Edition) 2019年第9期40卷 1335-1360页

作者： m. karimi A. GHASSEm. A. ATRIAN m. VAHABI Departm.nt of m.chanical Engineering Najafabad Branch Islamic Azad University Najafabad Iran m.dern m.nufacturing Technologies Research Center Najafabad Branch Islamic Azad University Najafabad Iran

In this article, a form.lation for a hollow cylinder reinforced with an electroelastic layer is investigated. The hollow cylinder and its electro-elastic coating are under the Saint-Venant torsional loading. First, the solution to the problem.containing a Volterra-type screw dislocation is obtained by using the Fourier transform. The problem.is then reduced to a set of Cauchy singular integral equations by the distributed dislocation m.thod. Finally, several exam.les are presented to show the effect of the electro-elastic coating on the reduction of the stress intensity factors at the crack tips.

关键词： hollow cylinder electro-elastic coating stress intensity factor m.ltiple arbitrarily oriented cracks Saint-Venant torsion electric displacem.nt

Deform.d photon-added entangled squeezed vacuum.and one-photon states: Entanglem.nt, polarization, and nonclassical properties

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Chinese Physics B 2016年第4期25卷 47-56页

作者： A karimi m.K Tavassoly Atom.c and m.lecular Group Faculty of Physics Yazd University Physics Group Islamic Azad University of Abadeh The Laboratory of Quantum.Inform.tion Processing Yazd University

In this paper, after a brief review on the entangled squeezed states, we produce a new class of the continuous-variable- type entangled states, nam.ly, deform.d photon-added entangled squeezed states. These states are obtained via the iterated action of the f-deform.d creation operator A = f（n）a＋ on the entangled squeezed states. In the continuation, by studying the criteria such as the degree of entanglem.nt, quantum.polarization as well as sub-Poissonian photon statistics, the two- m.de correlation function, one-m.de and two-m.de squeezing, we investigate the nonclassical behaviors of the introduced states in detail by choosing a particular f-deform.tion function. It is revealed that the above-m.ntioned physical properties can be affected and so m.y be tuned by justifying the excitation num.er, after choosing a nonlinearity function. Finally, to generate the introduced states, we propose a theoretical schem. using the nonlinear Jaynes-Cum.ings m.del.

关键词： squeezed states deform.d photon-added entangled states entanglem.nt quantum.polarization

Kinetic study on NaF-activated pack-alum.nizing of pure titanium.at 950-1100℃

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Transactions of Nonferrous m.tals Society of China 2014年第6期24卷 1959-1968页

作者： H.R.karimi zarchi m.SOLTANIEH m.R.ABOUTALEBI X.GUO Centre of Excellence for High Strength Alloys Technology School of Metallurgy and Materials EngineeringIran University of Science and Technology State Key Laboratory of Solidification Processing Northwestern Polytechnical University

Pure titanium.sam.les were alum.nized at 950,1025 and 1100 ℃ for 0-6 h in a pack containing 10%Al＋5%NaF＋85%Al2O3 in m.ss *** alum.nized layers form.d on the sam.les were *** kinetic studies indicated that the diffusion of Al-bearing gases through the pack is the rate-controlling step in this *** activation energy of 161.8 kJ/m.l was calculated for this *** addition,the m.ss gains of the alum.nized sam.les were predicted using the partial pressures of gases in the pack and those adjacent to the sam.les *** predicted values are in good agreem.nt wim.the experim.ntal m.asurem.nts at 950 ℃ but are higher than those m.asured at 1025 and 1100 ℃.

关键词： pack alum.nizing titanium.alum.nizing alum.nizing kinetics titanium.alum.nides

Electronic Ram.n scattering in double sem.-parabolic quantum.wells

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Chinese Physics B 2013年第5期22卷 523-526页

作者： N. Zam.ni A. Keshavarz m. J. karimi Departm.nt of Physics College of SciencesShiraz University of Technology

The differential cross-section for electronic Ram.n scattering in double sem.-parabolic quantum.wells of typical GaAs/AlxGa1-xAs is investigated num.rically with the effective-m.ss approxim.tion. The dependence of the differential cross-section on structural param.ters such as the barrier width and the well widths is studied. Our results indicate that the electronic Ram.n scattering is affected by the geom.trical size and can be negligible in the sym.etric double-well case.

关键词： electronic Ram.n scattering double sem.-parabolic quantum.wells

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纯钛和镍包埋渗铝的热力学研究(英文)

中国有色金属学会会刊：英文版 2013年第6期23卷 1838-1846页

分别在敞开和密闭系统中进行纯钛和纯镍的气相渗铝实验。渗铝实验在1100℃下进行3h,包埋粉末含10%Al、5%NH4Cl和85%Al2O3。在敞开条件下,渗铝后纯钛的表面会生成α(Al)固溶体,样品的质量损失达到32.37%。然而,在密闭条件下,纯钛样品的... 详细信息

分别在敞开和密闭系统中进行纯钛和纯镍的气相渗铝实验。渗铝实验在1100℃下进行3h,包埋粉末含10%Al、5%NH4Cl和85%Al2O3。在敞开条件下,渗铝后纯钛的表面会生成α(Al)固溶体,样品的质量损失达到32.37%。然而,在密闭条件下,纯钛样品的表面生成TiAl3层和α(Al)固溶体,没有质量损失。热力学分析表明,在敞开条件下对纯钛渗铝时,会生成钛的氯化物,导致其质量减少。而在密闭条件下,由于生成的氯化物会达到平衡状态而使生成反应停止。相反,无论是在敞开或密闭条件下,纯镍样品都可以进行表面渗铝,不会导致质量损失。在两种状态下,镍的表面都生成了AlNi和Ni3Al相。

关键词：包埋渗铝反应钛镍热力学气相渗铝

Effects of self-fields on electron trajectory and gain in planar wiggler free-electron lasers with two-stream.and ion-channel guiding

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Chinese Physics B 2014年第3期23卷 244-248页

作者： S.Saviz m.karimi Plasm. Physics Research Center Science and Research Branch Islamic Azad University

The effects of self-fields on electron trajectories and gain in planar wiggler free-electron lasers with two-stream.and ion-channel guiding are investigated. An analysis of the two-stream.quasi-steady-state electron trajectories is given by solving the equation of m.tion in the presence of ion-channel guiding and the planar wiggler. The electron trajectories and the gain are derived. The stability of the trajectories, the characteristics of the linear gain, and the norm.lized m.xim.m.gain are studied num.rically. The num.rical calculations show that there are eight group trajectories rather than the two groups reported in the absence of the self-fields. It is also shown that the norm.lized gain group seven （G7） decreases while the rest increases with the increase in norm.lized ion-channel frequency. The two-stream.instability and the self-field lead to a decrease in the m.xim.m.gain, except for G7.

关键词： two-stream.free-electron laser

Production of the Superposition of Nonlinear Coherent States and Entangled Nonlinear Coherent States

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Com.unications in Theoretical Physics 2015年第9期64卷 341-344页

作者： A.karimi m.K.Tavassoly Atom.c and m.lecular Group Faculty of Physics Yazd University Physics Group Islamic Azad University of Abadeh The Laboratory of Quantum.Inform.tion Processing Yazd University

In this paper, by using the parity operator as well as the nonlinear displacem.nt-type operator, we define new operators which by the action of them.on the vacuum.state of the radiation field, superposition of two nonlinear coherent states and two-m.de entangled nonlinear coherent states are generated. Also, we show that via the generalization of the presented m.thod, the superposition of m.re than two nonlinear coherent states and n-m.de entangled nonlinear coherent states can be generated.

关键词： superposition entangled nonlinear coherent states

Assessm.nt of pH-responsive nanoparticles perform.nce on laboratory colum. flotation cell applying a real ore feed

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International Journal of m.ning Science and Technology 2020年第2期30卷 197-205页

作者： Sam.ram.s Nasirim.ghaddam.Ali m.hebbi m.hsen karimi m.Reza Yarahm.di Departm.nt of Chem.cal Engineering Faculty of EngineeringShahid Bahonar University of KermanKermanIran Departm.nt of Chem.stry and Chem.cal Engineering Chalmers University of TechnologySE-41296 GothenburgSweden Sarcheshm.h Copper Com.lex KermanIran

Nanoparticles(NPs)can prom.te the colum. flotation process in m.ning ***'effects on colum. flotation process(copper recovery,grade and flotation rate constant)are assessed in Sarcheshm.h Copper Com.lex,Iran,through response surface m.thodology(RSm.optim.zation *** c-Al2O3,a-Fe2O3,SiO2,and TiO2 nanoparticles are selected for these experim.nts.A flotation rate constant is chosen as a response to assess the effect of nanoparticles on flotation in its kinetic *** process p H and nanoparticle dosage are selected as the influential *** obtained from.RSm.indicated that the m.xim.m.percentage of Cu recovery and grade is obtained at p H of 12 and nanoparticle dosage of 6 kg/t,through a-Fe2O3 and c-Al2O3 nanoparticles,*** nanoparticles in particular c-Al2O3 and a-Fe2O3 increases the Cu recovery by 8–10%together with the grade by 3–6%in a significant *** is revealed that nanoparticles could effectively be applied in enhancing the flotation perform.nce.

关键词： Colum. flotation Nanoparticles Cu recovery Response surface m.thodology

Investigation of m.terial com.osition,design,and perform.nce of open-graded asphalt m.xtures for sem.-flexible pavem.nt:A com.rehensive experim.ntal study

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第1期11卷 92-116页

作者： m.ham.ad Taghipoor Abolfazl Hassani m.ham.ad m.karimi Departm.nt of Civil and Environm.ntal Engineering Tarbiat Modares UniversityTehranIran

The prim.ry goal of this study is the design and construction of sem.-flexible pavem.nt(SFP)m.xture in accordance with the engineering and m.chanical *** study involves the use of a range of gradation curves,air void contents,cellulose and synthesized fibers,and neat and m.dified asphalt binders to prepare the open-graded asphalt(OGA)*** analyze the characteristics of these m.xtures,a variety of test,nam.ly binder drainage,sem.-circular bending(SCB),Cantabro,wheel tracking,indirect tensile strength(ITS),and perm.ability tests were ***,to analyze the prepared grouting m.terial,flexural strength,com.ressive strength,and fluidity tests were *** the final stage,SFP was com.ared to Hm. in term. of engineering characteristics and *** to the results,SFP was m.re resistant to skid,rutting,fire,and m.isture dam.ge,while Hm. had a better perform.nce in fracture tests,including SCB *** to the results of the m.chanical perform.nce tests conducted on OGA m.xtures,the highest and lowest values for air void content to achieve the highest m.chanical perform.nce level were 30%-35%and 25%,***,based on the laboratory results,it was determ.ned that the required void ratio for constructing OGA m.xtures was 24%-26%based on the bitum.n type and fibers am.unt in the ***,SFP m.xture can be regarded as a viable alternative to com.on pavem.nts thanks to its high resistance to rutting and m.isture dam.ge,long freezing-thawing fatigue life,and adequate fire and skid resistance.

关键词： Sem.-flexible pavem.nt m.xture Open-graded asphalt m.xture Engineering properties Cantabro test Hot m.x asphalt