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Dynamic Analysis of the non-Linear Behavior of a Composite Sandwich Beam with a Magnetorheological Elastomer Core

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Acta Mechanica Solida Sinica 2016年第3期29卷 271-283页

作者： n. Chikh A. nour S. Aguib i. Tawfiq Dynamic of Engines and Vibroacoustic Laboratory M'Hamed Bougara University of Boumerdes Algeria Laboratoire QUARTZ(EA7393) Supmeca 3 rue de Fernand Hainaut 93407 Saint-Ouen Cedex France

This work deals with the active control of the vibrations of mechanical structures incorporating magnetorheological elastomer. The damping coefficient and shear modulus of the elastomer increase when exposed to a magnetic field. Compared with the vibration control where the elastomer is permanently exposed to a magnetic field, the control of this process through time reduces vibrations more effectively. The experimental study for the vibrations of a sandwich beam filled with an elastomer is conducted, followed by a numerical study using the Abaqus code. The vibration damping is found to be dependent on the loading rate of micro-size ferromagnetic particles in the elastomer.

关键词： sandwich beam magnetorheological elastomer magnetic field stiffness loss factor

numerical analysis and centrifugal modeling of LnAPLs transport in subsurface system

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Progress in natural Science:Materials international 2006年第4期16卷 416-424页

作者： LO i.M.C. MEEGOda J.n. Department of Civil Engineering Hong Kong University of Science and Technology Hong Kong SARChina Department of Civil and Environmental Engineering new Jersey institute of Technology USA

The transport of non-aqueous phase liquids (nAPLs) in unsaturated soils and groundwater is an important research topic in geo-environmental engineering. in this paper, the mechanism of light nAPLs (LnAPLs) transport in subsurface system is briefly introduced, and the mass transport equations, fluid flow equations, and the constitutive model of relative permeability - saturation - capillary pressure are discussed. Then the numerical method is introduced to simulate the multiphase flow problems in porous media, and the tempospatial distribution of LnAPLs is obtained. Moreover, different boundary conditions are employed in numerical simulation to investigate its effect on transport behavior. To verify the numerical data, centrifugal tests are conducted to model the LnAPLs migration in unsaturated soils and groundwater. The calculation results are agreeable with the experimental findings of centrifugal modeling, which indicates that LnAPLs from leaking point move downwards due to gravity force, and form a high concentration zone above the capillary fringe, and then spread out laterally along the groundwater table. Some LnAPL enters groundwater system to further migrate. The combination of numerical simulation and centrifuge modeling can be a useful means to study the transport behavior of LnAPLs in subsurface system.

关键词： geo-environmental engineering subsurface contamination multiphase flow light non-aqueous phase liquids (LnAPLs) centrifugal modeling technique numerical simulation.

Van Hove Scenario in Two-Layer BCS Model

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Chinese Physics Letters 1996年第1期13卷 46-49页

作者： SHi da-ning College of Science Nanjing University of Aeronautics and AstronauticsNanjing 210016

in this letter,we study the effects of the interlayer hopping and pairing of the layered high-T_(c) superconductors within tiie framework of BCS-van Hove singularity *** obtained results are in qualitative agreement w... 详细信息

关键词： Hove singularity qualitative

Dirac operator on the sphere with attached wires

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Chinese Physics B 2016年第4期25卷 335-338页

作者： E n Grishanov D A Eremin D A ivanov i Yu Popov Ogarev Mordovia State University Bolshevistskaya Str. 68 Saransk Russia iTMO University Kroverkskiy pr. 49 St. Petersburg 197101 Russia

An explicitly solvable model for tunnelling of relativistic spinless particles through a sphere is suggested. The model operator is constructed by an operator extensions theory method from the orthogonal sum of the Dirac operators on a semi- axis and on the sphere. The transmission coefficient is obtained. The dependence of the transmission coefficient on the particle energy has a resonant character. One observes pairs of the Breit-Wigner and the Fano resonances. it correlates with the corresponding results for a non-relativistic particle.

关键词： Dirac operator nanostructure tunnelling solvable model

Calculation of multicentre nuclear attraction integrals over Slater-type orbitals using unsymmetrical one-range addition theorems

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Chinese Physics B 2010年第4期19卷 180-184页

作者： israfil i.Guseinov n.Seckin Gorgun nimet Zaim Department of Physics Faculty of Arts and SciencesOnsekiz Mart UniversityC anakkaleTurkey Department of Physics Faculty of Arts and SciencesTrakya UniversityEdirneTurkey

Using the unsymmetrical one-range addition theorems introduced by one of the authors with the help of complete orthonormal sets of $／varPsi ^／alpha $-exponential type orbitals （$／alpha = 1,0, - 1, - 2,...）$, this paper presents the sets of series expansion relations for multicentre nuclear attraction integrals over Slater-type orbitals arising in Hartree--Fock--Roothaan equations for molecules. The final results are expressed through multicentre charge density expansion coefficients and basic integrals. The convergence of the series is tested by calculating concrete cases for arbitrary values of parameters of orbitals.

关键词： Slater-type orbitals nuclear attraction integrals Hartree-Fock Roothaan equations unsymmetrical one-range addition theorems

Dielectric tunability of magnetic properties in orthorhombic ferromagnetic monolayer CrSBr

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npj Computational Materials 2023年第1期9卷 1514-1523页

作者： Alexander n.Rudenko Malte Rösner Mikhail i.Katsnelson Radboud University Institute for Molecules and MaterialsHeijendaalseweg 1356525AJ NijmegenThe Netherlands

Monolayer CrSBr is a recently discovered semiconducting spin-3/2 ferromagnet with a Curie temperature of around 146 *** contrast to many other known 2D magnets,the orthorhombic lattice of CrSBr gives rise to spatial anisotropy of magnetic excitations within the 2D *** magnetic anisotropy and considerable magnetic dipolar interactions in CrSBr challenge its theoretical description in terms of spin ***,we employ a Green’s function formalism combined with first-principles calculations to study the magnetic properties of monolayer CrSBr in different regimes of surrounding dielectric *** the free-standing limit,the system is close to an easy-plane magnet,whose long-range ordering is partially *** the contrary,in the regime of large external screening,monolayer CrSBr behaves like an easy-axis ferromagnet with more stable magnetic *** findings suggest that anisotropic layered magnets form a potentially promising platform for studying the effects of substrate screening on magnetic ordering in 2D.

关键词： monolayer orthorhombic anisotropy

Thermogravimetric kinetic analysis of nannochloropsis oculata combustion in air atmosphere

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Frontiers in Energy 2015年第2期9卷 125-133页

作者： SUKARni SUDJiTO nurkholis HAMiDi i.n.G. WARdanA Uun YAnUHAR Department of Mechanical Engineering Faculty of Engineering StateUniversity of Malang J1. Semarang 5 Malang 65145 East-JavaIndonesia Department of Mechanical Engineering Faculty of EngineeringUniversity of Brawijaya J1. Mayjen Haryono 167 Malang 65145East-Java Indonesia Biotechnology Laboratory Department of Water Resources Manage-ment Faculty of Fisheries and Marine Sciences University ofBrawijaya J1. Veteran Malang 65145 East-Java Indonesia

The thermal behavior of nannochloropsis oculata combustion in air atmosphere were investigated by performing experiments on STA PT1600 Thermal Analyzer at heating rates of 10℃/min, 40℃/min and 70℃/min and range of temperatures from room tempera- ture to 1200℃. The kinetic parameters were evaluated by using Kissinger and Ozawa methods. The result showed that nannochloropsis oculata combustion occurred in five stages. Started with initial devolatilization, the main thermal decomposition and combustion process, transition stage, the combustion of char and the last stage was the slow burning reaction of residual char. in line with increasing heating rate, the mass loss rate increased as well, but it delayed the thermal decomposition processes toward higher temperatures. The average activation energy at the main thermal decomposition stage and the stage of char combustion were approximately 251 kJ/mol and 178 kJ/mol, respectively.

关键词： nannochloropsis oculata combustion,kinetic parameters air atmosphere thermogravimetric

Effects of laying on of hands with and without a spiritual context on pain and functionality of older women with knee osteoarthritis:study protocol for a randomized controlled trial

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Journal of integrative Medicine 2018年第2期16卷 106-112页

作者： Katy Andrade Monteiro Zacaron nélia da Silva Mendes Yuri Cotta e Silva Giancarlo Lucchetti School of Medicine Federal University of Juiz de ForaJuiz de Fora 36036-330Brazil institute of Life Sciences Department of PhysiotherapyFederal University of Juiz de ForaGovernador Valadares 35012-140Brazil Faculty of Physical Therapy Federal University of Juiz de ForaJuiz de Fora 36036-330Brazil

Background： Laying on of hands （LooH） is a culturally-accepted therapy in several traditions. in Brazil, ＂Spiritism＂（third-largest religious tradition in number of followers） uses LooH with the name of ＂Spiritist Passe＂（SP）. However, there are few studies assessing SP＇s role in medical outcomes. The present study aims to investigate the effects of LooH, with and without a spiritual context, on pain, joint stiffness, and functional capacity of older women （≥60 years old） with knee osteoarthritis （KOA）. Methods/design： in this triple-blind, prospective randomized controlled trial, older women with KOA are assigned to three groups： LooH with a spiritual context group, LooH group without a spiritual context, and a control group receiving no intervention. Patients are assessed by a blinded researcher at baseline, 8 weeks, and 16 weeks. Pain, joint stiffness, and functional capacity are assessed using Western Ontario and McMaster Universities Osteoarthritis index. Other measures such as anxiety, depression, gait speed, and quality of life will also be assessed. To detect differences between groups, a post-intervention com- parison between the three groups and a mean change （post-pre） comparison among the three groups will be done using analysis of variance. All statistical analyses will be performed using an intention-to-treat approach and a per-protocol analysis. Discussion： A pragmatic design using SP, LooH without spiritual context, and no LooH may provide further scientific evidence on SP＇s feasibility and efficacy for KOA patients.

关键词： Complementary therapies Spiritual therapies Therapeutic touch Spiritual healing Holistic therapies Knee osteoarthritis

DEHP exposure destroys blood-testis barrier (BTB) integrity of immature testes through excessive ROS-mediated autophagy

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Genes & Diseases 2018年第3期5卷 263-274页

作者： W.E.i.Yi Tang Xiang-Liang Zhou Yu Liu Bin Shen Lian-Ju Long Chun-lan L.i.n.Tao H.E.da-wei W.U.Sheng-de W.E.i.Guang-hui Department of Urology Children’s Hospital of Chongqing Medical UniversityZhongshan 2RDYuzhong DistrictChongqing400014China Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering China Ministry of Education Key Laboratory of Child Development and Disorders China China international Science and Technology Cooperation Base of Child Development and Critical Disorders China Chongqing Key Laboratory of Pediatrics Chongqing China

Di-(2-ethylhexyl)phthalate(DEHP),is known to impair testicular functions and ***,its effects on immature testis Blood-testis barrier(BTB)and the underlying mechanisms remain *** constructed a rat model to investigate the roles of autophagy in BTB toxicity induced by *** rats were developmentally exposed to 0,250 and 500 mg/kg DEHP via intragastric administration from postnatal day(PnD)1 to PnD *** morphology,expressions of BTB junction proteins and autophagy related proteins were *** addition,expressions of oxida.ive stress markers were also *** results demonstrated that developmental DEHP exposure induced decreasing organ coefficients of immature testes and severe testicular damage in *** expressions of junctional proteins were down-regulated significantly after DEHP ***,DEHP simultaneously increased the number of autophagosomes and the levels of autophagy marker LC3-ii and p62,suggesting that the accumulated autophagosomes resulted from impaired autophagy ***,the expressions of HO-1 and SOD levels remarkably decreased after DEHP *** E and C could alleviate the DEHP-induced oxida.ive stress,reverse the autophagy defect and restore the BTB *** together,DEHP exposure destroys immature testis blood-testis barrier(BTB)integrity through excessive ROSmediated autophagy.

关键词： Autophagy BTB DEHP immature testis Oxida.ive stress