检索结果-南通市图书馆

THE EFFECT OF W ON THE REPASSIVATION BEHAVIOR OF Ni-ADDED STAINLESS STEELS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta metallurgica Sinica(English Letters) 2005年第4期18卷 489-496页

作者： J.X. Pan k. y. k.m Jiuquan Iron ＆ Steel （Group） Co. Ltd Jiayuguan 735100 China Pohang University.of Science and Technology Pohang 790-784 Korea

The effect of W on the repassivation behavior of Ni-added stainless steels was investigated with respect to the repassivation rate and the SCC susceptibility. It was found that more stable passive film was formed on the W-modified stainless steels than that of steels without W-modification, and the repassivation rate was faster for W-modified stainless steels in acidic chloride solution （0.5m H2SO4＋3.5% Cl^-）. In neutral chloride solution （1m mgCl2）, there were no significant differences on both passivation properties and the repassivation rates for duplex stainless steels, while W-modified austenite stainless steel showed faster repassivation rate. The SCC tests verified that W-modified Ni-added stainless steels exhibited better SCC resistance than steels without W in chloride solution. moreover, W-modification in higher Ni-added stainless steels exhibited more remark.ble SCC resistance than steels with lower Ni content in chloride solution.

关键词： stainless steel repassivation stress corrosion crack.ng scratching electrode technique

Angular Dependence of Lateral and Levitation Forces in Asy.metric Small magnet/Superconducting Sy.tems

在线全文

学校读者我要写书评

暂无评论

Chinese Phy.ics Letters 2007年第9期24卷 2700-2703页

作者： H. m. Al-k.ateeb m. k. Alqadi F. y. Alzoubi N. y. Ay.ub Department of Phy.ics Jordan University of Science and Technology Irbid Jordan School of Applied Natural Sciences German Jordanian University Amman Jordan

The dipole-dipole interaction model is used to calculate the angular dependence of lateral and levitation forces on a small permanent magnet and a cy.indrical superconductor in the meissner state ly.ng laterally.off the sy.metric axis of the cy.inder. Under the assumption that the lateral displacement of the magnet is small compared with the phy.ical dimensions of the sy.tem, we obtain analy.ical expressions for the lateral and levitation forces as functions of geometrical parameters of the superconductor as well as the height, the lateral displacement and the orientation of magnetic moment of the magnet. The effect of thick.ess and radius of the superconductor on the levitation force is similar to that for a sy.metric magnet/superconducting cy.inder sy.tem, but within the range of lateral displacement. The splitting in the levitation force increases with the increasing angle of orientation of the magnetic moment of the magnet. For a given lateral displacement of the magnet, the lateral force vanishes when the magnetic moment is perpendicular to the surface of the superconductor and has a maximum value when the moment is parallel to the surface. For a given orientation of the magnetic moment, the lateral force has a linear relationship with the lateral displacement. The stability.of the magnet above the superconducting cy.inder is discussed in detail.

关键词： THIN SUPERCONDUCTING DISk. mEISSNER STATE mAGNETIC-LEVITATION PERmANENT-mAGNET CERAmICS Cy.INDER SAmPLE

Vibrations in magnet/Superconductor Levitation Sy.tems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Phy.ics Letters 2006年第6期23卷 1641-1644页

作者： F. y. Alzoubi H. m. Al-k.ateeb m. k. Alqadi N. y. Ay.ub Department of Phy.ics Jordan University of Science and Technology Irbid Jordan Department of Phy.ics Yarmouk University Irbid Jordan School of Applied Natural Sciences German Jordanian University Amman Jordan

The problem of a small magnet levitating above a very.thin superconducting disc in the meissner state is analy.ed. The dipole-dipole interaction model is employ.d to derive analy.ical expressions for the interaction energy. levitation force, magnetic stiffness and frequency.of small vibrations about the equilibrium position in two different configurations, i.e. with the magnetic moment parallel and perpendicular to the superconductor. The results show that the frequency.of small vibrations decreases with the increasing levitation height for a particular radius of the superconducting disc, which is in good agreement with the experimental results. However, the frequency.increases monotonically.up to saturation by.increasing the radius of the disc for a particular height of the magnet. In addition, the frequency.of vibrations is higher when the sy.tem is in the vertical configuration than that when the sy.tem is in the horizontal configuration.

关键词： mEISSNER STATE SmALL mAGNET FORCE STIFFNESS SUPERCONDUCTORS SIZE

Effects of magnet Size and Geometry.on magnetic Levitation Force

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Phy.ics Letters 2007年第9期24卷 2664-2666页

作者： m. k. Alqadi H. m. Al-k.ateeb F. y. Alzoubi N. y. Ay.ub Department of Phy.ics Jordan University of Science and Technology Irbid Jordan School of Natural Applied Sciences German Jordanian University Amman Jordan

We obtain analy.ical relations for the levitation force as a function of dimensions of the superconductor-magnet sy.tem. The force has been calculated on the basis of the dipole-dipole interaction model. The effect of thick.ess of the superconductor on the levitation force is investigated. The results show that the influence of geometry.and thick.ess of the magnet becomes significantly.large at small levitation distances. Furthermore, approximating the permanent magnet as a point dipole results in an inaccurate estimation of the levitation force.

关键词： mEISSNER STATE

Features of Rotating Stall Cell in a Diagonal Flow Fan (in Case of mid-loading Rotor)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 2006年第2期15卷 103-108页

作者： N.SHIOmI k. k.NEk. y. k.NOUE T. SETOGUCHI Department of mechanical Engineering Saga University Saga 840-8502 Japan

The structure and behavior of rotating stall cell were experimentally.clarified in a diagonal flow fan. The specific-speed of the fan was 1140 （r/min, m^3/min, m）, and the total pressure-rise coefficient at design flow-rate was 0.345. The static pressure on outer casing wall and the total pressure at rotor inlet and outlet were measured using a high response pressure transducer. The measured data were processed by.the use of DPLA technique, and the structure and behavior of rotating stall cell were obtained. As a result, the stall cell extent for circumferential and spanwise direction and the pressure distributions inside stall cell were clarified. The details of stall cell propagation were also shown.

关键词： diagonal flow fan rotating stall cell unsteady.flow DPLA technique

Atomistic Simulation of the Orientation-dependent Plastic Deformation mechanisms of Iron Nanopillars

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2012年第2期28卷 164-168页

作者： y. Zhang D.J. y. k.m. Wang Anshan-Normal University 43 Pingan Street Anshanll4005 China University.of Science and Technology.LiaoNing Anshanll4051 China

Tensile tests were performed on iron nanopillars oriented along [001] and [110] directions at a constant temperature of 300 k.through molecular dy.amics simulations with an embedded-atom interatomic potential for iron. The nanopillars were stretched until y.elding to investigate the onset of their plastic deformation behaviors. y.elding was found to occur through two different mechanisms for [001] and [110] tensions. In the former case, plastic deformation is initiated by.dislocation nucleation at the edges of the nanopillar, whereas in the latter case by.phase transformation inside the nanopillar. The details during the onset of plastic deformation under the two different orientations were analy.ed. The vary.ng mechanisms during plastic deformation initiation are bound to influence the mechanical behavior of such nanoscale materials, especially.those strongly.textured.

关键词： Iron molecular dy.amics simulation Nanopillar Plastic deformation

A Two-Dimensional Architecture for Fast Large-Scale Trapped-Ion Quantum Computing

在线全文

学校读者我要写书评

暂无评论

Chinese Phy.ics Letters 2020年第7期37卷 5-10页

作者： y.-k.Wu L.-m.Duan Center for Quantum Information IIISTsinghua UniversityBeijing 100084China

Building block. of quantum computers have been demonstrated in small to intermediate-scale *** one of the leading platforms,the trapped ion sy.tem has attracted wide attention.A significant challenge in this sy.tem is to combine fast high-fidelity.gates with scalability.and convenience in ion trap *** we propose an architecture for large-scale quantum computing with a two-dimensional array.of atomic ions trapped at such large distance which is convenient for ion-trap fabrication but usually.believed to be unsuitable for quantum computing as the conventional gates would be too *** gate operations far outside of the Lamb–Dick. region,we show that fast and robust entangling gates can be realized in any.large ion *** gate operations are intrinsically.parallel and robust to thermal noise,which,together with their high speed and scalability.of the proposed architecture,mak.s this approach an attractive one for large-scale quantum computing.

关键词： Quantum computer operations

Review of Divertor Studies in LHD

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2006年第1期8卷 14-18页

作者： T. mORISAk. S. mASUZAk. A. k.mORI N. OHy.BU m. k.BAy.SHI J. mIy.ZAWA m. SHOJI 高翔 k. IDA k. Ik.DA O. k.NEk. k. k.WAHATA S. k.BO S. mORITA k. NAGAOk. H. NAk.NISHI k. NARIHARA y. Ok. m. OSAk.BE B. J. PETERSON S. SAk.k.BARA R. SAk.mOTO T. SHImOZUmA y. TAk.IRI k. TANAk. k. TOI, k. TSUmORI k. y. WATABABE T. WATARI H. y.mADA I. y.mADA 严龙文杨青巍杨愚 y.y.SHImURA m. y.SHINUmA O. mOTOJImA National Institute for Fusion Science Toki Gifu 509-5292 Japan Institute of Plasma Phy.ics Chinese Academy of Sciences Hefei 230031 China Southwesteru Institute of Phy.ics Chengdu 610041 China

In the Large Helical Device （LHD）, two different divertor configurations, i.e. helical divertor （HD） and local island divertor （LID）, are utilized to control the edge plasma. The HD with two X-points is an intrinsic divertor for heliotron devices, accompanied with a relatively.thick.ergodic lay.r outside the confinement region. Edge and divertor plasma behavior from low density.to high density.regimes is presented, referring to the divertor detachment. The effect of the ergodic lay.r on the edge transport is also discussed. On the other hand, the LID is an advanced divertor concept which realizes a high pumping efficiency.by.the combination of an externally.induced magnetic island and a closed pumping sy.tem. Experimental results to confirm the fundamental divertor performance of the LID are presented.

关键词： LHD divertor ergodic lay.r magnetic island edge plasma

Interfacial stress transfer behavior in a specially.shaped fiber/matrix pullout test

在线全文

学校读者我要写书评

暂无评论

Acta mechanica Sinica 2010年第1期26卷 113-119页

作者： y. R. Zhao y. m. Xing Z. k. Lei F. C. Lang School of Civil Engineering Inner Mongolia University of Technology 010051 Hohhot China Department of Applied mechanics Inner Mongolia University of Technology010051 Hohhot China State k.y.Laboratory.of Structural Analy.is for Industrial Equipment Dalian University of Technology116024 Dalian China

Specially.designed fibers are widely.used in engineering practice because the specially.designed shape can help to improve the bonding strength of the fiber and the interface. Studied in this paper is the interfacial shear stress transfer behavior on both sides of the specially.designed fiber when it is being pulled out; in which automatic analy.is of three-dimensional photoelasticity.is employ.d and the finite element method is adopted. The results show that the stress transfer occurs mainly.in the region near the fiber＇s embedded end where the stress reaches its critical point, leading to debonding of the interface. Before debonding, as the pullout loading increases, the peak.value of shear stress transfers along the fiber from the embedded end to the interior of the matrix, and then stops at the hook.d part of the fiber because of its impediment. When the interface begins to debond as the load increases, the shear stress can be transferred to the hook.d part.

关键词： Fiber-reinforced composites Specially.shaped fiber Interfacial stress transfer Photo-elasticity.- FEm