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Effect of erosion on corrosion of API X120 steel in relation to erodent particle size

Journal of Iron and Steel Research International 2020年第6期27卷 691-701页

作者： Paul C.Okonkwo Said Grami Srinivasan Murugan Shariq Khan Mechanical and Mechatronics Engineering Department College of EngineeringDhofar University211 SalalahOman Chemical Engineering College of EngineeringDhofar University211 SalalahOman

The nature of the solid erodent particles present in corrosive petroleum fluid can cause transporting pipeline to experience severe erosion and corrosion damages. The effect of erosion on corrosion behavior of API X120 steel was investigated using aluminum oxide and silicon carbide particles with different sizes as erodent and 3.5wt.% NaCl aqueous solution saturated with carbon dioxide as a corrosive medium. The effect of the erodent particle size on the corrosion behavior of the steel material at different particle speeds and impact angles was investigated using weight loss, potentiodynamic polarization and surface analysis techniques. The erosion results confirmed that the material damage increased with increasing particle speed. It was observed that in carbon dioxide-saturated saline solution, deposition of protective iron carbonate film occurred on the steel surface. It was found that the corrosion film can provide better protection at lower particle speed than at higher speed. The ratio of total erosion-corrosion (S)/effect of erosion on corrosion (T) analysis confirmed that at higher S/T ratio, the particle speed and material removal rate are low and vice versa at lower S/T ratio. Lower S/T values for the combined erosion and corrosion tests performed with erodent silicon carbide particle compared to erodent aluminum oxide particle showed that erosion enhancement of corrosion is more evident in the test performed using aluminum oxide particle than using silicon carbide particle. The result also suggests that when subjected to larger size erodent particle, the damage to pipeline due to effect of erosion on corrosion process can be more significant compared to smaller size erodent particle.

关键词： Erosion Corrosion API X120 steel Carbon dioxide Aluminum oxide Silicon carbide Erodent particlesize

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Explosive synchronization of complex networks with different chaotic oscillators

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Chinese Physics B 2013年第6期22卷 257-261页

作者：赵军产 college of Mathematics and Computer Science Wuhan Textile University

Recent studies have shown that explosive synchronization transitions can be observed in networks of phase oscillators [Goemez-Gardenes J, Goemez S, Arenas A and Moreno Y 2011 Phys. Rev. Lett. 106 128701] and chaotic oscillators [Leyva I, Sevilla-Escoboza R, Buldu J M, Sendifia-Nadal I, Goemez-Gardefies J, Arenas A, Moreno Y, Goemez S, Jaimes-Reaitegui R and Boccaletti S 2012 Phys. Rev. Lett. 108 168702]. Here, we study the effect of different chaotic dynamics on the synchronization transitions in small world networks and scale free networks. The continuous transition is discovered for R6ssler systems in both of the above complex networks. However, explosive transitions take place for the coupled Lorenz systems, and the main reason is the abrupt change of dynamics before achieving complete synchronization. Our results show that the explosive synchronization transitions are accompanied by the change of system dynamics.

关键词： complex network explosive synchronization transition chaotic oscillator

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Numeral eddy current sensor modelling based on genetic neural network

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Chinese Physics B 2008年第3期17卷 878-882页

作者：俞阿龙 Department of Electronic and Electrical Engineering Huaiyin Teachers College

This paper presents a method used to the numeral eddy current sensor modelling based on the genetic neural network to settle its nonlinear problem. The principle and algorithms of genetic neural network are introduced. In this method, the nonlinear model parameters of the numeral eddy current sensor are optimized by genetic neural network （GNN） according to measurement data. So the method remains both the global searching ability of genetic algorithm and the good local searching ability of neural network. The nonlinear model has the advantages of strong robustness, on-line modelling and high precision. The maximum nonlinearity error can be reduced to 0.037% by using GNN. However, the maximum nonlinearity error is 0.075% using the least square method.

关键词： modelling numeral eddy current sensor functional link neural network genetic neural network

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Non-Markovian dynamics of two non-coupled qubits interacting with two separate reservoirs with different spectral densities

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Chinese Physics B 2013年第4期22卷 128-132页

作者：王小云丁邦福赵鹤平 college of Physics and Mechanical & Electrical Engineering Jishou University

The dynamics of two non-coupled qubits independently interacting with their reservoirs is solved by the time convolutionless projection operator method. We study two-qubit quantum correlation dynamics for two different types of spectral densities, which are a Lorentzian distribution and an Ohmic spectral density with a Lorentzian–Drude cutoff function. For two qubits initially prepared in the initial Bell state, quantum discord can keep longer time and reach larger values in nonMarkovian reservoirs for the first spectral distribution or by reducing the cutoff frequency for the second case. For the initial Bell-like state, the dynamic behaviors of quantum discord and entanglement are compared. The results show that a long time of quantum correlation can be obtained by adjusting some parameters in experiment and further confirm that the discord can capture quantum correlation in addition to entanglement.

关键词： Lorentzian and Ohmic spectral densities the time convolution-less projection operator method non-Markovian and Markovian regime quantum discord and entanglement

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Deterministically distinguishing a remote Bell state

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Chinese Physics B 2011年第1期20卷 138-141页

作者：赵志国彭卫民谭勇刚 Physics and Information Engineering Department Luoyang Normal College

It has been proven that, with a single copy provided, the four Bell states cannot be distinguished by local operations and classical communications （LOCC）. Traditionally, a Bell basis projective measurement is needed to distinguish the four Bell states, which is usually carried out with a local interference between two particles. This paper presents an interesting protocol that allows two remote parties to distinguish four Bell states deterministically. We prove that our protocol of distinguishing remote Bell states is beyond LOCC.

关键词： Bell basis measurement LOCC distinguishability

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Uniform YF_3 nanorods:Synthesis,luminescent properties and cytotoxicity study

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Journal of Rare Earths 2011年第11期29卷 1036-1039页

作者：吕蕴海李苑赵东张林飞钟声亮 college of Chemistry and Chemical Engineering Jiangxi Normal University

Uniform YF3 nanorods composed of nanoparticles were successfully prepared via a facile solvothermal method with ethanol as solvent and tetrabutyl ammonium fluoride（TBAF） as fluorine *** products were characterized with powder X-ray diffraction（XRD）,scanning electron microscopy（SEM） and transmission electron microscopy（TEM）.The nanorods were with diameters of ca.60 nm and lengths ranging from 200 to 350 ***3＋ and Tb3＋ doped YF3 nanorods were also prepared and their photoluminescence properties were *** study revealed that these YF3 based nanorods were biocompatible.

关键词： yttrium fluoride nanorods luminescent properties bio-application rare earths

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Mechanical properties and corrosion resistance of low rigidity quaternary titanium alloy for biomedical applications

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中国有色金属学会会刊：英文版 2009年第4期19卷 862-865页

作者： Han-Cheol CHOE Viswanat han S.SAJI Yeong-Mu KO Department of Dental Materials College of DentistryChosun University

Electrochemical corrosion of Ti-35Nb-5Ta-7Zr alloy fabricated by arc melting and heat treatment process was studied in 0.9% NaCl at(37±1) ℃.Phase and microstructure of the fabricated alloy were investigated using X-ray diffractometer and scanning electron *** properties such as yield strength and elastic modulus of the alloy were determined by tensile *** polarization technique and impedance spectroscopy were employed to study the corrosion *** results of the study were compared with those obtained for Ti-6Al-4V commercial *** result of the study supports feasibility of Ti-35Nb-5Ta-7Zr alloy for implant applications.

关键词：生物医学应用钛合金力学性能耐腐蚀性扫描电子显微镜四元刚性 X射线衍射仪

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Electrical and Optical Characterization of DBD and Its Application to Plasma Treatment of PET Fibers

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Plasma Science and Technology 2011年第6期13卷 641-644页

作者：刁颖徐金洲胡倩倩张菁石建军郭颖 Department of Applied Physics College of ScienceDonghua University

A newly developed atmospheric pressure dielectric barrier discharge （DBD） plasma treatment system （PLA-PLA） was used in this study. The discharge is characterized by electrical analysis and optical emission spectroscopy （OES）. The characters of the discharge were found to change systematically with an increase of applied voltage and variation of flow ratio of O2/Ar in the plasma. The OES analysis revealed that the relatively weak spectrum line can be detected beyond a certain applied power value. It is also found that the emission intensity of main species in the discharge spectrum will be enhanced with the increase of applied power. To improve the wettability, poly （ethylene terephtalate）（PET） fiber was treated in this system. The surface morphology and properties of fiber after plasma treatment were investigated by both scanning electron microscope （SEM） and contact angle measurement.

关键词： plasma treatment dielectric barrier discharges (DBD) PET fiber wettability

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Nonlinear optical behaviors in a silver nanoparticle array at different wavelengths

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Chinese Physics B 2013年第1期22卷 287-291页

作者：余本海张东玲李盈傧汤清彬 college of Physics and Electronic Engineering Xinyang Normal University

The optical nonlinearities of an Ag nanoparticle array are investigated by performing Z-scan measurements at the selected wavelengths （400, 600, 650, and 800 nm）. The nonlinear refraction index in the resonant region （around 400 nm） exhibits a significant enhancement by two orders compared with that in the off-resonant region （around 800 nm））, and exhibits an sign alternation of the resonant nonlinear absorption, which results in a negligible nonlinear absorption at a certain excitation intensity. Moreover, a low degree of nonlinear absorption was measured at the edges of the resonant region （600 and 650 nm）, which is attributed to the competition of the saturated absorption and the two-photon absorption processes.

关键词： third-order optical nonlinearity Ag nanoparticles nanosphere lithography

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Investigation of coupled cobalt-silver nanoparticle system by plan view TEM

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Progress in Natural Science:Materials International 2012年第3期22卷 186-192页

作者： Daniel Fox Ruggero Verre Brendan J. O'Dowd Sunil K. Arora Colm C. Faulkner Igor V. Shvets School of Physics and CRANN Trinity College Dublin CRANN Advanced Microscopy Laboratory Trinity College Dublin

We present a transmission electron microscopy (TEM) investigation of a coupled cobalt and silver nanoparticle system. A plan view in situ lift-out method for preparing samples for TEM using the focused ion beam (FIB) microscope was used. This technique is used to prepare high quality TEM samples with site specificity in a short time and with a high success rate. We demonstrate the ability of the plan view sample preparation technique to provide information about an ordered system of nanoparticles which could not be observed using standard FIB cross sectioning of the sample. High resolution TEM and energy dispersive X-ray spectroscopy mapping of both cross sectional and plan view samples are presented, clearly showing the significant benefit of plan view TEM analysis for certain samples.

关键词： Focused ion beam Transmission electron microscopy Lift-out Co Ag Nanoparticle

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