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Journal articles on the topic 'Quasi-phase plane method'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Pereverzev, Yu V., and V. G. Borisenko. "Magnon spectrum and phase transitions in easy-plane magnets." Soviet Journal of Low Temperature Physics 13, no. 11 (1987): 670–74. https://doi.org/10.1063/10.0031823.

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The method of two-time delaying Green’s functions is used to study the magnon spectrum and stability boundary (from the divergence of the transverse magnetic susceptibility) of the paramagnetic phase of easy-plane magnets with one-ion anisotropy in a magnetic field perpendicular to the easy plane. The behavior of the phase boundary in the low-frequency region is studied. An equation is derived for the line along which the energy of low-frequency magnons vanishes for arbitrary quasi-momenta. The coordinates of the line terminal on the phase curve are obtained. The change in the shape of the pha

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2

Yin, Mu Yi, Ling Zhang, Peng Zhu, and Fei Guan. "Control for Optimized Air-Gap Magnetic Field of Five-Phase Induction Motor through Dual-Plane Asynchronous Rotation Transformation." Applied Mechanics and Materials 347-350 (August 2013): 486–90. http://dx.doi.org/10.4028/www.scientific.net/amm.347-350.486.

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This paper presents a control scheme with an optimized air-gap magnetic field for five-phase induction motor, the control objective is to generate a quasi-square magnetic flux density by the control of excitation and torque currents in the two planes. In this paper, the decoupling vector control model of five-phase induction motor in d1-q1-d3-q3 coordinate system is analyzed, and the direct and quadrature current components in the third harmonic plane as non-linear functions of the fundamental are built, which guarantee the air-gap magnetic to be a constant quasi-square waveform irrespective o

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3

Liu, Kai, Si Jin Wu, Xin Ya Gao, and Lian Xiang Yang. "Simultaneous Measurement of In-Plane and Out-of-Plane Deformations Using Dual-Beam Spatial-Carrier Digital Speckle Pattern Interferometry." Applied Mechanics and Materials 782 (August 2015): 316–25. http://dx.doi.org/10.4028/www.scientific.net/amm.782.316.

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Digital speckle pattern interferometry (DSPI) is an advanced technique for both in-plane and out-of-plane deformation measurements of diffuse surfaces in nanoscale. It has been widely used in aerospace engineering and other high-tech industries due to the advantages of non-contact, high-accuracy and full-field measurement. Traditionally, DSPI uses temporal phase shifting method to achieve precise deformation measurement, but it is only suitable for quasi-static deformation. Spatial-carrier method is another effective phase retrieval method used in DSPI and its validity has been verified in som

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4

Ivliyev, Andrey Dmitrievich, Vladislav Vitalievich Meshkov, and Mikhail Yurievich Chernoskutov. "Condensed Materials Thermal Diffusivity Measurements Using Temperature Waves Method in Adiabatic Regime." Advanced Materials Research 1126 (October 2015): 28–32. http://dx.doi.org/10.4028/www.scientific.net/amr.1126.28.

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Temperature wave method is a quasi-stationary method for measuring thermal diffusivity of a substance. Method of plane temperature waves is a derivative of temperature wave method based on the notion of applying heat flux to first side of a sample and measuring temperature fluctuation on the second side of a sample. Changing temperature wave frequent allows us to enter adiabatic regime. Considering that phase of heat flux is known, the only parameter to be measured is phase of temperature changes on the second side of a sample relative to the phase of heat flux, which (in adiabatic regime) giv

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5

Fang, Xinru, Lingdi Huang, Zhimei Lou, and Yuanbin Wang. "Quasi-Periodic and Periodic Vibration Responses of an Axially Moving Beam under Multiple-Frequency Excitation." Mathematics 12, no. 17 (2024): 2608. http://dx.doi.org/10.3390/math12172608.

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In this work, quasi-periodic and periodic vibration responses of an axially moving beam are analytically investigated under multiple-frequency excitation. The governing equation is transformed into a nonlinear differential equation by applying the Galerkin method. A double multiple-scales method is used to study the quasi-periodic and periodic vibrations of an axially moving beam with varying velocity and external excitation. Time traces and phase-plane portraits of quasi-periodic and periodic vibrations are obtained, which are in excellent agreement with those of the direct time integration m

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6

Горбунов, D. Gorbunov, Вохмина, et al. "Chaotic Dynamics of Electroencephalogram Parameters." Journal of New Medical Technologies 22, no. 2 (2015): 38–73. http://dx.doi.org/10.12737/11830.

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A clinical medicine usually uses the amplitude-frequency characteristics of recorded biopotentials. The paper presents still chaotic dynamics, which takes place for the autocorrelation function A(t) and statistic function of distribution fix). It is proposed two new approaches for estimation of parameters of electroencephalograms. The first is based on the construction of the matrix of pairwise comparisons of recorded samples of brain potentials in subjects in different physiological (mental) states: with photostimulation and without it. The second method is based on calculating the parameters

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7

Boucerredj, N., F. Semari, S. Ghemid, et al. "Density functional theory investigation of the phase transition, elastic and thermal characteristics for AuMTe₂(M = Ga, In) chalcopyrite compounds." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 80, no. 6 (2024): 807–20. https://doi.org/10.1107/s2052520624010473.

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We explored the pressure-induced structural phase transitions and elastic properties of AuMTe2 (M = Ga, In) using the full-potential linearized augmented plane wave method within the framework of density functional theory, applying both generalized gradient and local density approximations. Thermodynamic properties were further assessed through the quasi-harmonic model. We determined the transition pressures for the phase shift from the chalcopyrite structure to the NaCl rock-salt phase in both AuGaTe2 and AuInTe2. Additionally, we calculated and analyzed mechanical properties, such as bulk mo

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8

Kuznetsov, Alexander Petrovich, Yuliya Viktorovna Sedova, and Nataliya Vladimirovna Stankevich. "Chaotic Rossler Oscillator with Controlled Stimulus Phase." Differential Equations and Control Processes, no. 1 (2024): 60–69. https://doi.org/10.21638/11701/spbu35.2024.105.

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The dynamics of the chaotic Rossler with external force the phase of which depends on the state of the system is investigated. The study was carried out with the method of charts of Lyapunov exponents that identify areas of different types of dynamics on the plane frequency - amplitude of the external force. Their transformation is discussed with an increase in the parameter responsible for the dependence of the phase on the dynamical variable. The possibility of quasi-periodic dynamics with the set of Arnold tongues was demonstrated. It is shown that with a strong dependence of the phase on t

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9

Горбунов, D. Gorbunov, Вохмина, et al. "Stochastic and chaotic evaluation of parameters of lectroencephalogram." Complexity. Mind. Postnonclassic 4, no. 1 (2015): 54–59. http://dx.doi.org/10.12737/10865.

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Traditionally parameters of amplitude-frequency characteristics of recorded biopotentials are used in EEG. In this paper we show that they are still chaotic, which takes place for the autocorrelation function A(t). It is proposed the two new approaches for estimation of parameters of electroencephalograms. The first is based on the construction of the matrix of pairwise comparisons of recorded samples of brain potentials in subjects in different physiological (mental) states. The second method is based on calculating the parameters of quasi-attractors, which are built on the plane in the coord

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10

Limare, A., M. Tal, M. D. Reitz, E. Lajeunesse, and F. Métivier. "Optical method for measuring bed topography and flow depth in an experimental flume." Solid Earth Discussions 3, no. 1 (2011): 187–215. http://dx.doi.org/10.5194/sed-3-187-2011.

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Abstract. We describe an optical method known as moiré for acquiring quasi-simultaneous measurements of bed topography and flow depth in laboratory experiments. The moiré method is based on projecting a fringe pattern (grating) on the bed and analyzing the deformation of the pattern caused by the topography with respect to a reference plane. The height of the object is encoded in the phase of the pattern and can be retrieved either through Fourier transform or phase shifting algorithms. The methodology enables image-based non-contact measurements over a continuous surface at very high spatial

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11

Limare, A., M. Tal, M. D. Reitz, E. Lajeunesse, and F. Métivier. "Optical method for measuring bed topography and flow depth in an experimental flume." Solid Earth 2, no. 2 (2011): 143–54. http://dx.doi.org/10.5194/se-2-143-2011.

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Abstract. We describe an optical method known as moiré for acquiring quasi-simultaneous measurements of bed topography and flow depth in laboratory experiments. The moiré method is based on projecting a fringe pattern (grating) on the bed and analyzing the deformation of the pattern caused by the topography with respect to a reference plane. The height of the object is encoded in the phase of the pattern and can be retrieved either through Fourier transform or phase shifting algorithms. The methodology enables image-based non-contact measurements over a continuous surface at very high spatial

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12

Wang, Lihua, and Sung Gong Chung. "Entanglement perturbation theory for infinite quasi-1D quantum systems." International Journal of Modern Physics B 29, no. 07 (2015): 1550042. http://dx.doi.org/10.1142/s0217979215500423.

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We develop entanglement perturbation theory (EPT) for infinite Quasi-1D quantum systems. The spin-1/2 Heisenberg chain with ferromagnetic nearest neighbor (NN) and antiferromagnetic next nearest neighbor (NNN) interactions with an easy-plane anisotropy is studied as a prototypical system. The obtained phase diagram is compared with a recent prediction [Phys. Rev. B 81, 094430 (2010)] that dimer and Néel orders appear alternately as the XXZ anisotropy Δ approaches the isotropic limit Δ = 1. The first and second transitions (across dimer, Néel and dimer phases) are detected with improved accurac

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13

Ri, Kwangchol, Junhyok Jang, Cholil Yun, Choljun Pak, and Kwangchol Kim. "Analysis of subharmonic and quasi-periodic vibrations of a Jeffcott rotor supported on a squeeze-film damper by the IHB method." AIP Advances 12, no. 5 (2022): 055328. http://dx.doi.org/10.1063/5.0088334.

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In rotors supported on a squeeze-film damper (SFD) with static eccentricity, subharmonic and quasi-periodic vibrations are generated by rotor unbalance. In this paper, subharmonic and quasi-periodic vibrations in a Jeffcott rotor supported on an SFD are analyzed using the modified incremental harmonic balance (IHB) method. Oil film forces in the damper are calculated using π film theory and short bearing approximation. These forces are first calculated in the time domain and then transformed into the frequency domain by Fourier transformation. The oil film forces in the frequency domain are mu

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14

Valentová, Soňa, Michal Šejnoha, and Jan Vorel. "COMPARING MORI-TANAKA METHOD AND FIRST-ORDER HOMOGENIZATION SCHEME IN THE VISCOELASTIC MODELING OF UNIDIRECTIONAL FIBROUS COMPOSITES." Acta Polytechnica CTU Proceedings 26 (March 17, 2020): 133–38. http://dx.doi.org/10.14311/app.2020.26.0133.

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A comparative study of the viscous response of polymer matrix based fibrous composites predicted by the Mori-Tanaka method and finite element simulations based on the 1st order homogenization theory is presented. Aligned basalt and carbon fibers embedded into a polymeric matrix are considered to represent a quasi isotropic and transversely isotropic two-phase systems. While differences in the prediction of the macroscopic elastic response are attributed merely to the properties of the fiber phase, the viscoelastic behavior is largely affected by the selected homogenization method. A stiffer re

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15

ZHANG, TIAN, YAN CHENG, ZHEN-LONG LV, GUANG-FU JI, and MIN GONG. "PHASE TRANSITION AND THERMODYNAMIC PROPERTIES OF MAGNESIUM FLUORIDE BY FIRST PRINCIPLES." International Journal of Modern Physics B 28, no. 08 (2014): 1450026. http://dx.doi.org/10.1142/s021797921450026x.

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The structural stabilities, phase transitions and thermodynamic properties of MgF 2 under high pressure and temperature are investigated by first-principles calculations based on plane-wave pseudopotential density functional theory method within the local density approximation. The calculated lattice parameters of MgF 2 in all four phases under zero pressure and zero temperature are in good agreement with the existing experimental data and other theoretical results. Our results demonstrate that MgF 2 undergoes a series of structural phase transitions from rutile (P42/mnm)→ CaCl 2-type (Pnnm)→

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16

Cherkasov, Oleg, Alena Zarodnyuk, and Nina Smirnova. "Optimal Thrust Programming Along the Brachistochronic Trajectory with Non-linear Drag." International Journal of Nonlinear Sciences and Numerical Simulation 20, no. 1 (2019): 63–68. http://dx.doi.org/10.1515/ijnsns-2018-0112.

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AbstractThe problem of maximization of the horizontal coordinate of a mass-point moving in the vertical plane driven by gravity, non-linear viscous drag, and thrust is considered. The slope angle and the thrust are considered as a control variables. The problem is related to the modified brachistochrone problem. Principle maximum procedure allows to reduce the optimal control problem to the boundary value problem for a set of systems of two non-linear differential equations. The qualitative analysis of the trajectories of these systems is performed, and the characteristic features of the optim

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17

Mohd Hanif, Siti Hashimah, Walter Charles Primus, Abdul H. Shaari, and Hassan Jumiah. "Fabrication and Electrical Properties of Strontium Doped Lanthanum Manganite Titanite Oxide." Advanced Materials Research 1107 (June 2015): 278–82. http://dx.doi.org/10.4028/www.scientific.net/amr.1107.278.

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Composition of La0.7Sr0.3Mn0.4Ti0.6O3has been prepared using solid state reaction method where its crystal structure and electrical properties has been analyzed using X-ray Diffractometer (XRD) and Low frequency LCR meter, respectively. The result, shows that the sample has cubic perovskite structure with the existence of impurities phase. In electrical measurement, the frequency dependence of complex capacitance plot shows the sample have strong dispersion at lower frequency and the impedance plane plot shows a semicircle due to the grain effect. The sample electrical properties are also repr

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18

Uzcategui, Omar. "2-D depth migration in transversely isotropic media using explicit operators." GEOPHYSICS 60, no. 6 (1995): 1819–29. http://dx.doi.org/10.1190/1.1443914.

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Stable, explicit depth‐extrapolation filters can be used to propagate plane waves corresponding to the qP and qSV (quasi‐P and quasi‐SV propagation) modes for transversely isotropic (TI) media. Here, I discuss and compare results of two different methods for obtaining the filters for TI media with a vertical axis of symmetry (VTI). The first, a modified Taylor series method, is used to calculate the N‐coefficients of a finite‐length filter such that the Taylor expansion around vertical propagation matches the spatial Fourier transform of the downward‐continuation operator for VTI media. Second

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19

Liu, Xianbo, and Jun Zhu. "First-principles study of the structure, elastic constants, electronic and thermodynamic properties of C15 laves phase ZrMo2." International Journal of Modern Physics B 34, no. 18 (2020): 2050170. http://dx.doi.org/10.1142/s0217979220501702.

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The structure, elastic constants and electron state density of ZrMo2 in [Formula: see text]15 phase are investigated by pseudopotential plane-wave method based on density functional theory (DFT). The thermodynamic properties are studied with the quasi-harmonic Debye model. The calculated results are in good agreement with the previous experimental results and theoretical simulations. The calculated phonon spectra and elastic constants show that [Formula: see text]15 phase of ZrMo2 is mechanically stable. Through the analysis of [Formula: see text]/[Formula: see text] value and Poisson’s ratio,

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20

Tahar Belarbi, W., Abdelkarim Rouabhia, F. Tair, Bouhalouane Amrani, and Nadir Sekkal. "Low symmetry phases of (Al, Ga)Sb under low pressure." International Journal of Modern Physics B 29, no. 09 (2015): 1550056. http://dx.doi.org/10.1142/s0217979215500563.

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The interesting problem of the first phase transition which is induced by pressure in AlSb and GaSb antimonide binaries is revisited. Then, the case of the AlGaSb ternary has been investigated too. The choice of ternary AlGaSb is due to the particular attention which is given actually to it and to the quasi-absence of investigations of the phase transitions in it. We found that low pressures applied to GaSb and AlSb induce transitions from zinc-blende to Imm2 and from zinc-blende to Cmcm, respectively. Our result for AlSb is in agreement with literature, and in the case of GaSb which poses the

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21

Neyolov, V. V., E. L. Kapylov, A. A. Samorodov, and B. A. Samorodov. "Wavefront distortion analysis of a microwave collimator system with complex horn feed." Radio industry (Russia) 29, no. 4 (2019): 8–17. http://dx.doi.org/10.21778/2413-9599-2019-29-4-8-17.

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Phase structure distortion of the probe field that occurs when the collimator-type assemblies of irradiators used in measuring the polarization scattering matrices of location objects are used as part of the radar measuring complex was discussed. It is shown that, due to the specific design, the phase centers of the irradiators in the assembly are removed from the collimator focus, resulting in the appearance of longitudinal-transverse defocusing, which is expressed in the slope and curvature of the wavefront of the probe field. For a quantitative analysis of these distortions, a method for ca

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22

Qian, Bo, Shi Jing Wu, Hong Wu Li, and Jin Xu. "The Research on Nonlinear Vibration Characteristic of Ravingneaux Compound Planetary Gear Sets." Applied Mechanics and Materials 105-107 (September 2011): 62–69. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.62.

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The nonlinear dynamic model of Ravingneaux compound planetary gear sets has been built. The model includes time-varying mesh stiffness of gears, backlash as well as comprehensive mesh errors nonlinearities. By introducing relative displacements of components as the new generalized coordinates, uniform nonlinear differential equations of compound planetary gear sets are built. Then the nondimensional dynamic differential equations are derived. The nonlinear differential equations have been solved utilizing ariable step size Gill method. By changing system nondimensional excitation frequency, mo

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23

Middleton, M. J., P. C. Fragile, A. Ingram, and T. P. Roberts. "The Lense–Thirring timing-accretion plane for ULXs." Monthly Notices of the Royal Astronomical Society 489, no. 1 (2019): 282–96. http://dx.doi.org/10.1093/mnras/stz2005.

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ABSTRACT Identifying the compact object in ultraluminous X-ray sources (ULXs) has to date required detection of pulsations or a cyclotron resonance scattering feature (CRSF), indicating a magnetized neutron star. However, pulsations are observed to be transient and it is plausible that accretion on to the neutron star may have suppressed the surface magnetic field such that pulsations and CRSFs will be entirely absent. We may therefore lack direct means to identify neutron star systems whilst we presently lack an effective means by which to identify black hole ULXs. Here we present a possible

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24

Li, Lei, Ji Ping Hao, and Yi Huang. "Nonlinear Mechanical Characters of Shallow Reticulated Spherical Shells with Initial Damage." Advanced Materials Research 446-449 (January 2012): 366–69. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.366.

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Based on theory of Lematire’s equivalent strain of the damage and with the damage of bars of the shallow reticulated spherical shell, on the basis of the nonlinear dynamical foundational equations and introducing dimensionless quantity of shells with uniform thickness, the nonlinear dynamic equation of the shallow spherical shells with initial damage were established by the method of quasi-shells. Then, the critical conditions of that chaos motion of the structure with initial damage are given by the Melnikov function. Finally, further using the digital simulation plotted the plane phase and i

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25

Yang, Juping, Junguo Wang, and Yongxiang Zhao. "Dynamics simulation of rolling bearing system with pedestal looseness in speed-up train." Journal of Physics: Conference Series 2285, no. 1 (2022): 012042. http://dx.doi.org/10.1088/1742-6596/2285/1/012042.

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Abstract The paper mainly studies the dynamics characteristics of the roller bearing system with pedestal looseness in speed-up train. Considering eccentricity, damping coefficient, stiffness of shaft, and support forces of roller bearing, a centralized mass model of roller bearing system of speed-up train is presented. Moreover, numerical analysis method is adopted to solve the dynamics responses. Based on the trajectory cures, phase plane portraits, Poincaré maps, and amplitude spectrum cures, the dynamics characteristics are analysed when the motor rotating speed and gap of the looseness ar

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26

N*, Satyavani, Dr C. Kamal Basha, and Dr N. Visali. "A Critical analysis of Non-ideal Quasi Z Source Inverter considering with parasitic resistances." International Journal of Recent Technology and Engineering (IJRTE) 8, no. 4 (2019): 2061–69. http://dx.doi.org/10.35940/ijrte.a6985.118419.

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This paper describes the perfect small signal mathematical modeling of a non-ideal quasi-Z-source inverter (q-ZSI) by considering the parasitic resistances of capacitors and inductors. In this work, the detailed transfer function model of the system is derived mathematically by using state-space averaging method under continuous conduction mode (CCM). The deduced transfer function model exhibits the non-minimum phase of a system in the capacitor voltage-to-control transfer function due to the presence of Right-Half-Plane (RHP) zeros. The RHP zeros could impose a limitation on the controller de

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Normatov, Alexander, Boris Spektor, and Joseph Shamir. "Analysis of Phase Distribution of Focused Light in High Numerical Aperture Systems." Key Engineering Materials 437 (May 2010): 616–20. http://dx.doi.org/10.4028/www.scientific.net/kem.437.616.

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High numerical aperture focusing is becoming increasingly important for nanotechnology related applications. Rigorous, vector evaluation of the focused field, in such cases, is usually performed using the Richards-Wolf method which is based on the Debye approach. The resulting field is known to have a piecewise quasi planar phase. A corresponding result, produced by a Fresnel-Kirchhoff integral for aplanatic optical systems of medium and low numerical apertures, leads to the well known physical fact that a quadratic phase exists when the entrance pupil is not located at the front focal plane.

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28

Chowdhury, P., Heon-Jung Kim, and Sung-Ik Lee. "Flux Dynamics and Vortex Phase Diagram in Tl2Ba2CaCu2O8 System." International Journal of Modern Physics B 17, no. 18n20 (2003): 3423–26. http://dx.doi.org/10.1142/s0217979203021113.

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Experimental data on the field and time dependencies of the isothermal magnetization hysteresis for Tl 2 Ba 2 CaCu 2 O 8 single crystals with fields applied parallel to the c-axis are reported. From the M–H measurements, we determined the first peak field (Hp), the onset field of the second peak (Hon), the second peak field (Hsp), and the irreversible field (Hirr). Using these physical parameters, we have drawn a vortex phase diagram for this system. As observed in BSCCO(2212) system, below the irreversibility line, the H–T plane is divided into three distinct phases: the vortex lattice, the e

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29

McDONALD, N. ROBB. "The decay of cyclonic eddies by Rossby wave radiation." Journal of Fluid Mechanics 361 (April 25, 1998): 237–52. http://dx.doi.org/10.1017/s0022112098008696.

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It is argued that because shallow water cyclones on a β-plane drift westward at a speed equal to an available Rossby wave phase speed, they must radiate energy and cannot, therefore, be steady. The form of the Rossby wave wake accompanying a quasi-steady cyclone is calculated and the energy flux in the radiated waves determined. Further, an explicit expression for the radiation-induced northward drift of the cyclone is obtained. A general method for determining the effects of the radiation on the radius and amplitude of the vortex based on conservation of energy and potential vorticity is give

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Bykov, K. Y., I. V. Kachanov, and I. M. Shatalov. "Power Mode of High-Speed Combined Extrusion of Flat Bimetallic Road Milling Picks." Science & Technique 20, no. 4 (2021): 287–95. http://dx.doi.org/10.21122/2227-1031-2021-20-4-287-295.

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The paper presents a mathematical model developed for calculating the force effect on the punch in the process of high-speed combined hot extrusion of bimetallic road milling picks under plane deformation conditions. To solve the problem, the process is divided into two phases: acceleration phase and braking phase, which consists of two stages. A distinctive feature of the acceleration phase is that it allows the analysis of reverse extrusion, in the process of which the metal flows in the opposite direction to the punch stroke. A method for calculating the force acting on the punch at each ph

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31

Li, L. "Half-metallic behavior Co2YAl (Y= Mo,Tc) compounds." Experimental and Theoretical NANOTECHNOLOGY 7, no. 1 (2023): 55–66. http://dx.doi.org/10.56053/7.1.55.

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The present manuscript reports structural stability, half-metallic behavior, thermophysical and thermoelectric properties of Co2MoAl and Co2TcAl full Heusler compounds using first-principle calculations. The full-potential linearized augmented plane wave method within the framework of density functional theory is implemented and WIEN2k code is incorporated in the stable Fm- 3m phase to attain the desired results. The L21 phase is found as the most stable phase for both compounds. The optimized equilibrium lattice parameters in the stable phase are 5.89Å, 5.86Å for Co2MoAl and Co2TcAl respectiv

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Ali, M. S., M. Roknuzzaman, R. Parvin, A. K. M. A. Islam, and K. Ostrikov. "Electronic, optical and thermal properties of TiCr2 and TiMn2 by ab initio simulations." International Journal of Modern Physics B 29, no. 31 (2015): 1550223. http://dx.doi.org/10.1142/s0217979215502239.

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A theoretical study of TiX2 (X = Cr, Mn) with C14 Laves phase compounds has been performed by using the first-principles pseudopotential plane-wave method within the generalized gradient approximation (GGA). The electronic properties (Fermi surface and charge density) have been calculated and analyzed. The optical characteristics (dielectric functions, absorption spectrum, conductivity, energy-loss spectrum and reflectivity) are calculated and discussed. The calculated large positive static dielectric constant indicates good dielectric properties. The reflectivity of TiX2 (X = Cr, Mn) is high

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Yang, Jianwei, Ran Sun, Dechen Yao, Jinhai Wang, and Chuan Liu. "Nonlinear Dynamic Analysis of high speed multiple units Gear Transmission System with Wear Fault." Mechanical Sciences 10, no. 1 (2019): 187–97. http://dx.doi.org/10.5194/ms-10-187-2019.

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Abstract. The helical gear system is an important form of transmission in high-speed trains, and helical gear failure has a great impact on the transmission performance. To investigate the influence of wear parameters on the nonlinear dynamics of gear systems, the wear fault parameters of a bending-torsion-shaft coupling mode with six degrees of freedom are established. Using the variable step fourth-order Runge-Kutta numerical integration method, the gear dynamics model with fault parameters is analyzed to get the dynamic response of the helical gear system. The system excitation frequency, e

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Pothérat, Alban, and Kacper Kornet. "The decay of wall-bounded MHD turbulence at low." Journal of Fluid Mechanics 783 (October 26, 2015): 605–36. http://dx.doi.org/10.1017/jfm.2015.572.

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We present direct numerical simulations of decaying magnetohydrodynamic (MHD) turbulence at low magnetic Reynolds number. The domain considered is bounded by periodic boundary conditions in the two directions perpendicular to the magnetic field and by two plane Hartmann walls in the third direction. Regimes of high magnetic fields (Hartmann number of up to 896) are reached thanks to a new spectral method using the eigenvectors of the dissipation operator. The decay is found to proceed through two phases: first, energy and integral length scales vary rapidly during a two-dimensionalisation phas

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Okatev, Roman S., and Peter G. Frick. "Recurrence time statistics for chaos analysis in dynamical systems." Вестник Пермского университета. Физика, no. 3 (2024): 19–27. http://dx.doi.org/10.17072/1994-3598-2024-3-19-27.

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We propose a method of delimiting the existence domains of periodic, quasi-periodic and chaotic solutions of dynamical systems in the parameter space. The method is based on an analysis of the sampling of the times of passing a phase point from the previous intersection of the Poincaré plane to the next one (or from one local maximum to the next). An algorithm for generating a sample of recurrence times with subsequent analysis of the histogram of the obtained sample is constructed. A simple measure of histogram filling allows us to separate periodic and chaotic modes, as well as to estimate t

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Polshchikov, Henrikh, and Pavlo Zhukov. "Construction of a generalized mathematical model and fast calculations of plane-parallel rotating magnetic fields in process reactors with longitudinal currents of cylindrical inductors on a graphical calculator." Technology audit and production reserves 5, no. 1(79) (2024): 38–49. http://dx.doi.org/10.15587/2706-5448.2024.313937.

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The object of research is a quasi-stationary rotating magnetic field (RMF) generated by cylindrical inductors with longitudinal windings in the working space of process reactors, in particular reactors designed to work with magnetic particles (MP). The RMF theory in the working space of reactors has not yet been sufficiently developed, which hinders the widespread introduction of the considered, rather complex technologies into practice. The RMF of a specific reactor can be calculated accurately and completely using modern programs based on the finite element method, but it does not replace th

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Khanlo, H. M., M. Ghayour, and S. Ziaei-Rad. "Disk Position Nonlinearity Effects on the Chaotic Behavior of Rotating Flexible Shaft-Disk Systems." Journal of Mechanics 28, no. 3 (2012): 513–22. http://dx.doi.org/10.1017/jmech.2012.61.

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AbstractThis study investigates the effects of disk position nonlinearities on the nonlinear dynamic behavior of a rotating flexible shaft-disk system. Displacement of the disk on the shaft causes certain nonlinear terms which appears in the equations of motion, which can in turn affect the dynamic behavior of the system. The system is modeled as a continuous shaft with a rigid disk in different locations. Also, the disk gyroscopic moment is considered. The partial differential equations of motion are extracted under the Rayleigh beam theory. The assumed modes method is used to discretize part

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Sunada, S., K. Kawachi, I. Watanabe, and A. Azuma. "PERFORMANCE OF A BUTTERFLY IN TAKE-OFF FLIGHT." Journal of Experimental Biology 183, no. 1 (1993): 249–77. http://dx.doi.org/10.1242/jeb.183.1.249.

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The flight of a butterfly, Pieris melete, was observed in the take-off phase and was analyzed theoretically from aerodynamic and kinetic viewpoints. A vortex method, which was recently developed by the present authors, was used in this analysis. During the downstroke, the butterfly generates mainly a vertical force. The acceleration of the butterfly's body during the first half of the downstroke is especially large, and this acceleration is mainly caused by a large unsteady pressure drag acting on the wings. This large unsteady pressure drag is generated by the vortices shed into the flow from

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Yalçın, Muhammet Muaz, and Mehmet İskender Özsoy. "Enhanced Crashworthiness Parameters of Nested Thin-Walled Carbon Fiber-Reinforced Polymer and Al Structures: Effect of Using Expanded Polypropylene Foam." Applied Sciences 14, no. 21 (2024): 9635. http://dx.doi.org/10.3390/app14219635.

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The in-plane loading conditions of carbon fiber/epoxy composite (CFRP) and aluminum nested-tube-reinforced expanded polypropylene (EPP) blocks were empirically examined. This study used crashworthiness metrics to estimate the best design configuration under quasi-static loading rates. The experimental phase began with lateral loading testing of single and nested aluminum and CFRP specimen. In-plane crushing experiments were performed on EPP foam blocks reinforced with nested tubes. Both single and nested aluminum tubes had comparable force–response curves and maintained their load-bearing capa

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Bagno, O. M. "On the influence of finite initial deformations on the surface instability of the incompressible elastic layer interacting with the half-space of an ideal fluid." Reports of the National Academy of Sciences of Ukraine, no. 1 (February 2021): 24–32. http://dx.doi.org/10.15407/dopovidi2021.01.024.

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The problem of the propagation of quasi-Lamb waves in a pre-deformed incompressible elastic layer that interacts with the half-space of an ideal compressible fluid is considered. The study is conducted on the basis of the three-dimensional linearized equations of elasticity theory of finite deformations for the incompressible elastic layer and on the basis of the three-dimensional linearized Euler equations for the half-space of an ideal compressible fluid. The problem is formulated, and the approach based on the utilization of representations of the general solutions of the linearized equatio

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Ravve, Igor, and Zvi Koren. "Slowness vector versus ray direction in polar anisotropic media." Geophysical Journal International 225, no. 3 (2021): 1725–54. http://dx.doi.org/10.1093/gji/ggab061.

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SUMMARY The inverse problem of finding the slowness vector from a known ray direction in general anisotropic elastic media is a challenging task, needed in many wave/ray-based methods, in particular, solving two-point ray bending problems. The conventional resolving equation set for general (triclinic) anisotropy consists of two fifth-degree polynomials and a sixth-degree polynomial, resulting in a single physical solution for quasi-compressional (qP) waves and up to 18 physical solutions for quasi-shear waves (qS). For polar anisotropy (transverse isotropy with a tilted symmetry axis), the re

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Knyazev, Boris, Valery Cherkassky, and Oleg Kameshkov. "“Perfect” Terahertz Vortex Beams Formed Using Diffractive Axicons and Prospects for Excitation of Vortex Surface Plasmon Polaritons." Applied Sciences 11, no. 2 (2021): 717. http://dx.doi.org/10.3390/app11020717.

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Transformation of a Bessel beam by a lens results in the formation of a “perfect” vortex beam (PVB) in the focal plane of the lens. The PVB has a single-ring cross-section and carries an orbital angular momentum (OAM) equal to the OAM of the “parent” beam. PVBs have numerous applications based on the assumption of their ideal ring-type structure. For instance, we proposed using terahertz PVBs to excite vortex surface plasmon polaritons propagating along cylindrical conductors and the creation of plasmon multiplex communication lines in the future (Comput. Opt. 2019, 43, 992). Recently, we demo

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NEMIRI, O., S. GHEMID, Z. CHOUAHDA, H. MERADJI, and F. EL HAJ HASSAN. "STRUCTURAL, ELECTRONIC, THERMODYNAMIC AND THERMAL PROPERTIES OF ZINC-BLENDE InP, InAs AND THEIR InAsx P1-x TERNARY ALLOYS VIA FIRST PRINCIPLES CALCULATIONS." International Journal of Modern Physics B 27, no. 27 (2013): 1350166. http://dx.doi.org/10.1142/s021797921350166x.

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First-principles calculations are performed to study the structural, electronic, thermodynamic and thermal properties of the InP and InAs bulk materials and InAs x P 1-x ternary alloys using the full potential-linearized augmented plane wave method (FP-LAPW) within the density functional theory (DFT). The dependence of the lattice constant, bulk modulus, band gap, Debye temperature, heat capacity and mixing entropy on the composition x was analyzed. The lattice constant for InAs x P 1-x alloys exhibits a marginal deviation from the Vegard's law. A large deviation of the bulk modulus from linea

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Goh, Ryan, Tasso J. Kaper, and Theodore Vo. "Delayed Hopf Bifurcation and Space–Time Buffer Curves in the Complex Ginzburg–Landau Equation." IMA Journal of Applied Mathematics 87, no. 2 (2022): 131–86. http://dx.doi.org/10.1093/imamat/hxac001.

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Abstract In this article, the recently discovered phenomenon of delayed Hopf bifurcations (DHB) in reaction–diffusion partial differential equations (PDEs) is analysed in the cubic Complex Ginzburg–Landau equation, as an equation in its own right, with a slowly varying parameter. We begin by using the classical asymptotic methods of stationary phase and steepest descents on the linearized PDE to show that solutions, which have approached the attracting quasi-steady state (QSS) before the Hopf bifurcation remain near that state for long times after the instantaneous Hopf bifurcation and the QSS

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Maack, Jonathan, and Bruce Turkington. "Reduced Models of Point Vortex Systems." Entropy 20, no. 12 (2018): 914. http://dx.doi.org/10.3390/e20120914.

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Nonequilibrium statistical models of point vortex systems are constructed using an optimal closure method, and these models are employed to approximate the relaxation toward equilibrium of systems governed by the two-dimensional Euler equations, as well as the quasi-geostrophic equations for either single-layer or two-layer flows. Optimal closure refers to a general method of reduction for Hamiltonian systems, in which macroscopic states are required to belong to a parametric family of distributions on phase space. In the case of point vortex ensembles, the macroscopic variables describe the s

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Villalón, Mario, Hugo Vega, Nahary Montoya, et al. "Comparative Study on the Effect that Coir Fibers Have on the Dynamic or Quasi-Static Elastic Moduli of Glass Fiber Laminates Obtained by the Vacuum Bag Technique." Key Engineering Materials 668 (October 2015): 137–44. http://dx.doi.org/10.4028/www.scientific.net/kem.668.137.

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The use of natural fibers has a great interest due to their damping properties, low density and moderate strength. The effect of incorporating chopped natural fibers, as disperse reinforced phase, on the dynamic or quasi-static elastic modulus of glass fiber laminates is presented. Squares of 32 cm2 plain wave glass fiber prepreg with epoxy resin were used in a stacking sequence [0]4. Short length chopped (1-3 mm) natural coir fiber was placed in between of each glass fiber prepreg sheet (4) and laminates were prepared by the vacuum bag technique. The volume fraction of natural fiber was 30% (

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CHELLI, S., H. MERADJI, S. AMARA KORBA, S. GHEMID, and F. EL HAJ HASSAN. "FIRST PRINCIPLES CALCULATIONS OF STRUCTURAL, ELECTRONIC, THERMODYNAMIC AND THERMAL PROPERTIES OF BaxSr1-xTe TERNARY ALLOYS." International Journal of Modern Physics B 28, no. 04 (2014): 1450041. http://dx.doi.org/10.1142/s0217979214500416.

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The structural, electronic thermodynamic and thermal properties of Ba x Sr 1-x Te ternary mixed crystals have been studied using the ab initio full-potential linearized augmented plane wave (FP-LAPW) method within density functional theory (DFT). In this approach, the Perdew–Burke–Ernzerhof-generalized gradient approximation (PBE-GGA) was used for the exchange-correlation potential. Moreover, the recently proposed modified Becke Johnson (mBJ) potential approximation, which successfully corrects the band-gap problem was also used for band structure calculations. The ground-state properties are

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Rotkin, Slava V. "(Invited) Multiphysics Model of the sSNOM Spectroscopy: Can Near-Field Probes Report the Spectrum of Nanomaterials?" ECS Meeting Abstracts MA2023-01, no. 10 (2023): 1180. http://dx.doi.org/10.1149/ma2023-01101180mtgabs.

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Last decade has been celebrated with a substantial increase of publications on imaging of nanomaterials with near-field probes. The latter include Tip-Enhanced Raman and/or Photoluminescence Spectroscopy (TERS/TEPL), various near-infrared (NIR) Atomic Force Microscopy (AFM) based methods, and several scattering Scanning Near-field optical methods (sSNOM). Using various coherent sources, often tunable in terms of excitation, these methods produce high spatial resolution images – near-field scanning maps, in terms of a pixel size claimed to be limited only by the size of the scanning tip. By des

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Mishchenko, Andrey, Maxim Veshkin, Vladimir Mondrus, and Leonid Stupishin. "RATIONAL DESIGN OF NONLINEAR-DEFORMABLE STRUCTURALLYHETEROGENEOUS ELEMENTS OF STRUCTURES." International Journal for Computational Civil and Structural Engineering 20, no. 3 (2024): 97–115. https://doi.org/10.22337/2587-9618-2024-20-3-97-115.

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The article deals with the problem of rational design of a nonlinearly deformable heterogeneous composite Timoshenko rod under force impact. The rod has a structure that is symmetrical relative to the force plane, formed by the connection of quasi-homogeneous parts (phases, layers) with different physical properties, taking any geometric shape in space. The structural materials that form the rod have nonlinear elastic properties. To describe the main component of the stress tensor – the normal stress in the longitudinal direction – in each phase, the same type of approximation by entire ration

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Zhou, Lei, Li-Yong Zhou, Rudolf Dvorak, and Jian Li. "Systematic survey of the dynamics of Uranus Trojans." Astronomy & Astrophysics 633 (January 2020): A153. http://dx.doi.org/10.1051/0004-6361/201936332.

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Context. The discovered Uranus Trojan (UT) 2011 QF99 and several candidate UTs have been reported to be in unstable orbits. This implies that the stability region around the triangular Lagrange points L4 and L5 of Uranus should be very limited. Aims. In this paper, we aim to locate the stability region for UTs and find out the dynamical mechanisms responsible for the structures in the phase space. The null detection of primordial UTs also needs to be explained. Methods. Using the spectral number as the stability indicator, we constructed the dynamical maps on the (a0, i0) plane. The proper fre

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