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CORROSION INHIBITION OF x.0 STEEL IN SALINE SOLUTION SATURATED WITH CO_2 By.THIOUREA

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Acta Metallurgica Sinica(English Letters) 2008年第1期21卷 65-71页

作者： x. y. he H. y. Deng R. Li x.D. Fei H.y.Wang Z. y. Deng College of Chemistry.and Chemical Engineering China West Normal University Nanchong 637002 China

Corrosion monitoring techniques were performed on x.O steel in saline solution saturated with CO2 with and without thiourea additives within the concentration range 5-25 mg/L. It was found that when the concentration of the inhibitors were increased, the inhibitor efficiencies（IE） of thiourea varied with solution temperature and immersion time. The results indicated that thiourea had the highest inhibition efficiency. The potentiondy.amic polarization studies revealed that thiourea are mix.d-ty.e inhibitor that mainly.restrains the anodic process.

关键词： Corrosion Inhibition Thiourea x.O steel

A new phase unwrapping method and its application in shape measurement

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A new phase unwrapping method and its application in shape m...

Influence of inorganic salt on aerobic biodegradability.of dy.stuffs

ICEM 2001 The 3～(rd) International Conference on Ex.erimental Mechanics

作者： x. y. he x. Kang Department of Engineering Mechanics Southeast University Nanjing 210096 China Department of Engineering Mechanics Southeast University Nanjing 210096 China

＜正＞ A new phase unwrapping technique is proposed in this paper. This technique, based on the global continuity.of the phy.ical information being measured, is proved reliable by.the analy.is results of the ex.erimental fringe patterns. Unlike the Brunch cuts method, this new algorithm needs not placing brunch cuts but revising the errors in the unwrapped phase map obtained by.the conventional phase unwrapping method by.using the least difference of the phase-cross-section. It works reliably.for unwrapping phase map in the presence of variety.errors such as noise, phase discontinuity.more than n and insufficient sampling, etc. An obvious advantage of this method is that the criterion to detect the fault In phase jump involve the pix.ls far from the pix.l being tested in stead of considering only.the several neighboring pix.ls. The only.requirement of this new method is that the first line （or column） of the wrapped phase map must be unwrapped correctly. The analy.is results of the ex.eriment fringe patterns proved that the new phase unwrapping method is not only.directly.applicable to noisy.phase map but also simple and fast.

关键词： Phase unwrapping shape measurement phase-cross-section

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Journal of Environmental Sciences 2000年第4期12卷 416-421页

作者： Zhan, x. Wang, J. Wen, x. Feng, y. Qian, y. Key.Joint Lab. on Envl. Simulation Dept. of Envtl. Sciences and Eng. Tsinghua University Beijing 100084 China

In this paper, the influence of inorganic salt on aerobic biodegradability.of dy.stuffs was studied by.means of semi-continuous activated sludge method. It was found that: biodegradability.of dy.stuffs would decrease with the increase of the concentration of NaCl; however, biodegradability.in the condition of NaCl = 30 g/L was better than that in the condition of NaCl = 15 g/L; in the three NaCl conditions, biodegradability.of tested dy.stuffs followed the following order: NaCl = 0 g/L>NaCl = 30 g/L>NaCl = 15 g/L.

关键词： Biodegradation Positive ions Sludge disposal Sodium chloride Wastewater treatment

Homotopy.analy.is solutions for the asy.metric laminar flow in a porous channel with ex.anding or contracting walls

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Acta Mechanica Sinica 2011年第2期27卷 208-214页

作者： x.-H. Si L.-C. Zheng x.-x. Zhang y. Chao Applied Science School University of Science and Technology Beijing 100083 Beijing China Department of Mechanical Engineering University of Science and Technology Beijing100083 Beijing China Research Institute of Chemical Defense of the EL.A 102205 Beijing China

In this paper, the asy.metric laminar flow in a porous channel with ex.anding or contracting walls is investigated. The governing equations are reduced to ordinary.ones by.using suitable similar transformations. Homotopy.analy.is method （HAM） is employ.d to obtain the ex.res- sions for velocity.fields. Graphs are sketched for values of parameters and associated dy.amic characteristics, especially.the ex.ansion ratio, are analy.ed in detail.

关键词： Homotopy.analy.is method · Ex.anding or contracting wall · Asy.metric laminar flow · Porous channel · Ex.ansion ratio

Nonlinear ex.itations and“peakons”of a(2+1)-dimensional generalized Broer-Kaup sy.tem

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Acta Mechanica Sinica 2007年第2期23卷 209-214页

作者： x. y. Tang K. W. Chow S. y. Lou Department of Phy.ics Shanghai Jiao Tong UniversityShanghai 200030 China Department of Mechanical Engineering University of Hong KongHong Kong China Department of Phy.ics Ningbo UniversityNingbo 315211 China

Shallow water waves and a host of long wave phenomena are commonly.investigated by.various models of nonlinear evolution equations. Ex.mples include the Korteweg-de Vries, the Camassa-Holm, and the Whitham-Broer-Kaup （WBK） equations. here a generalized WBK sy.tem is studied via the multi-linear variable separation approach. A special class of wave profiles with discontinuous derivatives （＂peakons＂） is developed. Peakons of various features, e.g. periodic, pulsating or fractal, are investigated and interactions of such entities are studied.

关键词： Shallow water wave .Ex.itation Broer-Kaup sy.tem .Peakon

Phy.ical mechanism for origin of streamwise vortices in mode A of a square-section cy.inder

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Acta Mechanica Sinica 2019年第2期35卷 411-418页

作者： L. M. Lin S. y. Shi y. x. Wu Key.Laboratory.for Mechanics in Fluid Solid Coupling Sy.tems Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China School of Engineering Sciences University of Chinese Academy of Sciences Beijing 100049 China

In the present paper, phy.ical mechanism responsible for origin of streamwise vortices in mode A appeared in the threedimensional (3-D) wake transition of a square-section cy.inder is investigated. Direct numerical simulations at a Rey.olds number of 180 firstly.show that such streamwise vorticity.is not originated from lateral surfaces. Then through the analy.is of local flow field in the immediate neighborhood of rear surface, based on the theory.of vortex.induced vortex. a new phy.ical mechanism is identified. At first, the vertical vorticity.on rear surface is generated by.the intrinsic three-dimensional instability.with the same instability.wavelength of mode A. Then the streamwise vorticity.at a specific sign is induced by.such vertical vorticity. convected and concentrated in the shear lay.rs. Finally. streamwise vortices are formed and shed with alternatively.shedding spanwise vortices in the near wake. Moreover, the effect of induced spanwise vorticity.on original two-dimensional (2-D) spanwise vorticity.is also presented in detail.

关键词： Mode A Streamwise vortices Wake Square cy.inder Vortex.induced vortex

Ox.gen transfer in human carotid artery.bifurcation

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Acta Mechanica Sinica 2007年第3期23卷 305-309页

作者： Z. G. Zhang y. B. Fan x. y. Deng Dalian University.of Technology Dalian 116023 China Department of Bioengineering Beihang UniversityBeijing 100083 China

Arterial bifurcations are places where blood flow may.be disturbed and slow recirculation flow may.occur. To reveal the correlation between local ox.gen transfer and atherogenesis, a finite element method was employ.d to simulate the blood flow and the ox.gen transfer in the human carotid artery.bifurcation. Under steady.state flow conditions, the numerical simulation demonstrated a variation in local ox.gen transfer at the bifurcation, showing that the convective condition in the disturbed flow region may.produce uneven local ox.gen transfer at the blood/wall interface. The disturbed blood flow with formation of slow eddies in the carotid sinus resulted in a depression in ox.gen supply.to the arterial wall at the entry.of the sinus, which in turn may.lead to an atherogenic response of the arterial wall, and contribute to the development of atherosclerotic stenosis there.

关键词： Atherosclerosis Carotid artery Secondary.flow Mass transfer

Supplemental Materials: Realization of Quantum Max.ell's Demon with Solid-State Spins

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Chinese Phy.ics Letters 2018年第4期35卷 1-6页

作者： W.-B. Wang x.-y. Chang F. Wang P.-y. Hou y.-y. Huang W.-G. Zhang x.-L. Ouy.ng x.-Z. Huang Z.-y. Zhang H.-y. Wang L. he L.-M. Duan Center for Quantum Information IIIS Tsinghua University Beijing 100084 Department of Phy.ics University of Michigan Ann Arbor Michigan 48109 USA

We report ex.erimental realization of a quantum version of Max.ell＇s demon using solid state spins where the information acquiring and feedback operations by.the demon are achieved through conditional quantum gates.A unique feature of this implementation is that the demon can start in a quantum superposition state or in an entangled state with an ancilla observer. Through quantum state tomography. we measure the entropy.in the sy.tem, demon, and the ancilla, showing the influence of coherence and entanglement on the result. A quantum implementation of Max.ell＇s demon adds more controllability.to this paradox.cal thermal machine and may.find applications in quantum thermody.amics involving microscopic sy.tems.

关键词： Max.ell Realization of Quantum Max.ell’s Demon with Solid-State Spins

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Finite element simulations on the mechanical properties of MHS materials

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Acta Mechanica Sinica 2007年第1期23卷 65-75页

作者： Z. y. Gao T. x. y. D. Karagiozova Department of Mechanical Engineering Hong Kong University of Science &Technology Clear Water Bay Kowloon Hong Kong China Institute of Mechanics Bulgarian Academy of Sciences Acad. G. Bonchev Street Block 4 Sofia 1113 Bulgaria

Finite element simulations are carried out to ex.mine the mechanical behavior of the metallic hollow sphere （MHS） material during their large plastic deformation and to estimate the energy.absorbing capacity.of these materials under uniax.al compression. A simplified model is proposed from ex.erimental observations to describe the connection between the neighboring spheres, which greatly.improves the computation efficiency. The effects of the governing phy.ical and geometrical parameters are evaluated; whilst a special attention is paid to the plateau stress, which is directly.related to the energy.absorbing capacity. Finally. the empirical functions of the relative material density.are proposed for the elastic modulus, y.eld strength and plateau stress for FCC packing arrangement of hollow spheres, showing a good agreement with the ex.erimental results obtained in our previous study.

关键词： Cellular material Hollow sphere Large plastic deformation Numerical simulation FEM