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Abrasive resistance of metastable v–Cr–Mn–Ni spheroidal carbide cast irons using the factorial design method

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International Journal of Minerals,Metallurgy and Materials 2016年第6期23卷 645-657页

作者： v.G.Efremenko K.Shimizu A.P.Cheiliakh T.v.Pastukhova Yu.G.Chabak K.Kusumoto Department of Metal Science and Heat Treatments of Metals Pryazovskyi State Technical University Department of Mechanical Aerospace and Materials Engineering Muroran Institute of Technology

Full factorial design was used to evaluate the two-body abrasive resistance of 3wt%C–4wt%Mn–1.5wt%Ni spheroidal carbide cast irons with varying vanadium（5.0wt%–10.0wt%） and chromium（up to 9.0wt%） contents. The alloys were quenched at 920℃. The regression equation of wear rate as a function of v and Cr contents was proposed. This regression equation shows that the wear rate decreases with increasing v content because of the growth of spheroidal vC carbide amount. Cr influences the overall response in a complex manner both by reducing the wear rate owing to eutectic carbides（M7C3） and by increasing the wear rate though stabilizing austenite to deformation-induced martensite transformation. This transformation is recognized as an important factor in increasing the abrasive response of the alloys. By analyzing the regression equation, the optimal content ranges are found to be 7.5wt%–10.0wt% for v and 2.5wt%–4.5wt% for Cr, which corresponds to the alloys containing 9vol%–15vol% spheroidal vC carbides, 8vol%–16vol% M7C3, and a metastable austenite/martensite matrix. The wear resistance is 1.9–2.3 times that of the traditional 12wt% v–13wt% Mn spheroidal carbide cast iron.

关键词： cast irons carbides abrasive resistance factorial design

Simulation of detection and scattering of sound waves by the lateral line of a fish

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Chinese Physics B 2022年第2期31卷 398-404页

作者： v M Adamyan I Y Popov I v Blinova v v Zavalniuk Odessa I.I.Mechnikov National University Dvoryanskaya Str.2Odesa65082Ukraine ITMO University Kronverkskiy49Saint Petersburg197101Russia Odessa Military Academy 10 Fontanska RoadOdesa 65009Ukraine

A solvable model of lateral line of a fish based on a wave equation with additional boundary conditions on a set of isolated points is *** the framework of this model it is shown that the ratio of pressures on lateral lines on different fish flanks,as well as the cross section of sound scattering on both the lines,strongly depends on angles of incidence of incoming sound *** strong angular dependence of the pressure ratio seems to be sufficient for the fish to determine the directions from which the sound is coming.

关键词： acoustic equation point self-adjoint perturbations of Laplace operator scattering lateral line

Structure and dielectric properties of solid solutions Bi_(7)Ti_(4+x)WxNb_(1-2x-0.1)v_(0.1)O_(21)(x=0.1-0.4)

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Journal of Advanced Dielectrics 2020年第1期10卷 48-54页

作者： S.v.Zubkov Research Institute of Physics Southern Federal University Stach.Ave.194Rostov-on-Don344090Russia

The structural and electrophysical characteristics of a number of solid solutions of layered oxides of the perovskite-type Bi_(7)Ti_(4+x)WxNb_(1-2x-0.1)v_(0.1)O_(21)(x=0.1-0.4)are *** to X-ray powder diffraction data,all the compounds studied are single-phase and have the structure of Aurivillius phases(m=2.5)with a rhombic crystal lattice(space group I2 cm,Z=2).Changes in tetragonal and rhombic distortions of perovskite-like layers in compounds were considered depending on their chemical *** temperature dependences of the relative permittivityε(T)were *** was shown that the Curie temperature T_(C) of the perovskite-type oxides Bi_(7)Ti_(4+x)WxNb_(1-2x-0.1)v_(0.1)O_(21)(x=0.1-0.4)linearly decreases with increasing parameter *** activation energies of charge carriers were obtained in different temperature *** was found that there are three temperature regions with very different activation energies due to the different nature of the charge carriers in the studied *** effect of substitution of Nb^(5+) ions by v^(5+) ions is *** was found that for a number of compounds,the substitution of niobium ions by vanadium ions led to an increase in the dielectric constant and a decrease in the dielectric loss tangent.

关键词： Aurivilliusphases Bi_(7)Ti_(4+x)WxNb_(1-2x-0.1)v_(0.1)O_(21) Curie temperature(T_(C)) tolerance factor

B-L model with D_(4)×Z_(4)×Z_(2)symmetry for fermion mass hierarchies and mixings

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Chinese Physics C 2024年第6期48卷 11-30页

作者： v.v.vien Department of Physics Tay Nguyen UniversityDaklakVietnam

We constructed a gauge B-L model with D_(4)×Z_(4)×Z_(2)symmetry to explain the quark and lepton mass hierarchies and their mixings with realistic CP phases via the type-I seesaw *** quark mases,three quark mixing angles,and the CP phase in the quark sector take the central values whereas Yukawa couplings in the quark sector are diluted in a range of difference of three orders of magnitude by the perturbation theory at the first *** the neutrino sector,a small neutrino mass is achieved by the type-I seesaw *** inverted and normal neutrino mass hierarchies are consistent with the experimental *** predicted sum of neutrino masses for normal and inverted hierarchies,the effective neutrino masses,and the Dirac CP phase are also consistent with recently reported limits.

关键词： flavor symmetries quark and lepton masses and mixing extensions of electroweak gauge sector neutrino mass and mixing non-standard-model neutrinos right-handed neutrinos D4 discrete symmetry

Linear seesaw model with T7 symmetry for neutrino mass and mixing

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Chinese Physics C 2022年第6期46卷 88-101页

作者： v.v.vien Institute of Applied Technology Thu Dau Mot UniversityBinh Duong ProvinceVietnam Department of Physics Tay Nguyen UniversityDaklak provinceVietnam

We propose a low-scale Standard Model extension with T_(7)×Z_(4)×Z_(3)×Z_(2) symmetry that can successfully explain observed neutrino oscillation results within the 3σ*** neutrino masses are obtained via the linear seesaw *** and inverted neutrino mass orderings are considered with three lepton mixing angles in their experimentally allowed 3σ*** model provides a suitable correlation between the solar and reactor neutrino mixing angles,which is consistent with the TM2 *** prediction for the Dirac phase isδCP∈(295.80,330.0)°for both normal and inverted orderings,including its experimentally maximum value,while those for the two Majorana phases areη1∈(349.60,356.60)°,η2=0 for normal ordering andη1∈(3.44,10.37)°,η2=0 for inverted *** addition,the predictions for the effective neutrino masses are consistent with the pre sent experimental bounds.

关键词： flavor symmetries models beyond the standard model non-standard-model neutrinos righthanded neutrinos discrete symmetries neutrino mass and mixing

A non-renormalizable B-L model with Q_(4)×Z_(4)×Z_(2) flavor symmetry for cobimaximal neutrino mixing

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Chinese Physics C 2021年第12期45卷 22-35页

作者： v.v.vien Theoretical Particle Physics and Cosmology Research Group Advanced Institute of Materials ScienceTon Due Thang UniversityHo Chi Minh CityVietnam Faculty of Applied Sciences Ton Due Thang UniversityHo Chi Minh CityVietnam

We construct a non-renormalizable gauge B-L model based on Q_(4)×Z_(4)×Z_(2) symmetry that successfully explains the cobimaximal lepton mixing *** active neutrino masses and both neutrino mass hierarchies are produced via the type-I seesaw mechanism at the *** model is predictive;hence,it reproduces the cobimaximal lepton mixing scheme,and the reactor neutrino mixing angle θ_(13) and the solar neutrino mixing angle θ_(12) can obtain best-fit values from recent experimental *** model also predicts the effective neut-rino mass parameters of mβ∈(8.80,9.05)mev and〈m_(ee)〉∈(3.65,3.95)mev for normal ordering(NO)and mβ ∈(49.16,49.2 l)mev and(mce)∈(48.59,48.67)mev for inverted ordering(IO),which are highly consistent with recent experimental constraints.

关键词： extensions of the electroweak Higgs sector neutrino mass and mixing nonstandard-model neutrinos right-handed neutrinos discrete symmetries

STRESS-STRAIN STATE OF ELASTOPLASTIC BODIES WITH CRACK

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Acta Mechanica Solida Sinica 2015年第4期28卷 375-383页

作者： v.v.Glagolev L.v.Glagolev A.A.Markin Tula State University

A physical cut model is used to describe the changes in the stress-strain state （SSS） in elastoplastic bodies weakened by cracks. The distance between the crack edges is considered to be finite in contrast to the mathematical cut. The interactive layer with a thickness limited by the possibility of using the hypothesis of continuity is distinguished on the physical cut extension, Distribution of stresses and strains over the layer thickness is constant and does not depend on the geometry of the boundary between the cut and the interactive layer. The relationship between stresses and strains is determined by the deformation plasticity theory. The problem of plane strain or plane stress state of an arbitrary finite body weakened by a physical cut is reduced to solving a system of two variational equations for displacement fields in the body parts adjacent to the interactive layer. The proposed approach eliminates the singularity in stress distribution in contrast to the mathematical cut model. Use of local strength criteria allows us to determine the time, point and direction of the fracture initiation. Possibilities of the proposed model are illustrated by solving the problems of determining the SSS of a rectangular body weakened by a physical cut under symmetric and antisymmetric loadings.

关键词： crack physical cut characteristic size elastoplastic deformations

Modelling Magnetoresistance Effect in Limited Anisotropic Semiconductors

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Chinese Physics Letters 2017年第7期34卷 212-214页

作者： Filippov v.v. Mitsuk S.v. Lipetsk State Pedagogical University of P. P. Semenov-Tyan-Shansky Lipetsk 398020 the Russian Federation Lipetsk State Technical University Lipetsk 398600 the Russian Federation

A macroscopic model of the magnetoresistance effect in fimited anisotropic semiconductors is built. This model allows us to solve the problem of measurement of physical magnetoresistance components of crystals and films. Based on a unified mathematical model the method is worked out enabling us to measure tensor components of the specific electrical resistance and the relative magnetoresistance of anisotropic semiconductors simultaneously.

关键词： Modelling Magnetoresistance Effect in Limited Anisotropic Semiconductors

Synthesis of MoO_3 by glow discharge in contact with water

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Plasma Science and Technology 2019年第2期21卷 97-104页

作者： A v KHLYUSTOvA N A SIROTKIN A S KRAYEv v A TITOv A v AGAFONOv Laboratory of Chemistry of Carbohydrate Coordination Compounds and Supermolecular System G.A.Krestov Institute of Solution Chemistry of RAS

An atmospheric pressure glow discharge was ignited between a molybdenum anode and the water surface of a cathode for the synthesis of MoO_3 powders. The action of glow discharge leads to the non-equilibrium evaporation of water, sputtering of the metal anode and formation of molybdenum(vI) oxide, which deposited on the anode. The chemical composition and morphology of the obtained powder were performed by using x-ray diffraction spectroscopy,scanning electron microscopy and Fourier transform infrared spectroscopy. It was found that the synthesized powders are pure α-MoO_3. The possible mechanism of the formation of molybdenum trioxide during glow discharge treatment was described. The photocatalytic performance of MoO_3 was estimated through the degradation of Rhodamine B under dark and Uv irradiation conditions. Orthorhombic MoO_3 exhibited the best photocatalytic activity for the photodegradation of Rhodamine B of 100% under Uv irradiation for 15 min.

关键词： molybdenum oxide glow discharge photocatalytic activity