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Journal articles on the topic 'Oscillation mode transition'

Author: Grafiati

Published: 6 September 2023

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1

LEONTINI, JUSTIN S., M. C. THOMPSON, and K. HOURIGAN. "Three-dimensional transition in the wake of a transversely oscillating cylinder." Journal of Fluid Mechanics 577 (April 19, 2007): 79–104. http://dx.doi.org/10.1017/s0022112006004320.

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A Floquet stability analysis of the transition to three-dimensionality in the wake of a cylinder forced to oscillate transversely to the free stream has been undertaken. The effect of varying the oscillation amplitude is determined for a frequency of oscillation close to the natural shedding frequency. The three-dimensional modes that arise are identified, and the effect of the oscillation amplitude on their structure and growth rate quantified.It is shown that when the two-dimensional wake is in the 2S configuration (which is similar to the Kármán vortex street), the three-dimensional modes t

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2

Ren, Linyuan, Yanan Wang, Weidong Ding, et al. "Discharge characteristics and mode transition of a ring-cusp magnetically confined plasma bridge neutralizer." Journal of Applied Physics 132, no. 8 (2022): 083301. http://dx.doi.org/10.1063/5.0101904.

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The discharge mode characteristics of cathodes may strongly influence the discharge stability and performance of electrostatic thrusters. In this article, discharge characteristics and mode transition phenomenon of the ring-cusp magnetically confined plasma bridge neutralizer (RCM-PBN) were experimentally studied using argon as the working gas. The dependences of anode current and oscillation amplitude on anode voltage, argon flow rate, heater power, and cathode-to-anode distance were investigated. Plasma properties were measured and plasma plume images were taken under different discharge mod

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Boriskov, Petr, Andrei Velichko, Nikolay Shilovsky, and Maksim Belyaev. "Bifurcation and Entropy Analysis of a Chaotic Spike Oscillator Circuit Based on the S-Switch." Entropy 24, no. 11 (2022): 1693. http://dx.doi.org/10.3390/e24111693.

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This paper presents a model and experimental study of a chaotic spike oscillator based on a leaky integrate-and-fire (LIF) neuron, which has a switching element with an S-type current-voltage characteristic (S-switch). The oscillator generates spikes of the S-switch in the form of chaotic pulse position modulation driven by the feedback with rate coding instability of LIF neuron. The oscillator model with piecewise function of the S-switch has resistive feedback using a second order filter. The oscillator circuit is built on four operational amplifiers and two field-effect transistors (MOSFETs

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Cai, M. L., Z. D. Liu, Y. Jiang, et al. "Probing a Dissipative Phase Transition with a Trapped Ion through Reservoir Engineering." Chinese Physics Letters 39, no. 2 (2022): 020502. http://dx.doi.org/10.1088/0256-307x/39/2/020502.

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Dissipation is often considered as a detrimental effect in quantum systems for unitary quantum operations. However, it has been shown that suitable dissipation can be useful resources in both quantum information and quantum simulation. Here, we propose and experimentally simulate a dissipative phase transition (DPT) model using a single trapped ion with an engineered reservoir. We show that the ion’s spatial oscillation mode reaches a steady state after the alternating application of unitary evolution under a quantum Rabi model Hamiltonian and sideband cooling of the oscillator. The average ph

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KANO, HIDEAKI, TAKASHI SAITO, AKIKATSU UEKI, and TAKAYOSHI KOBAYASHI. "FIRST OBSERVATION OF DYNAMIC INTENSITY BORROWING INDUCED BY COHERENT MOLECULAR VIBRATIONS IN J-AGGREGATES REVEALED BY SUB-5-FS SPECTROSCOPY." International Journal of Modern Physics B 15, no. 28n30 (2001): 3817–20. http://dx.doi.org/10.1142/s0217979201008743.

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Sub-5-fs spectroscopy of porphyrin J-aggregates reveals for the first time coherent molecular vibration coupled to the Frenkel exciton. The oscillations with the frequency of 244cm-1 are described by a plus-cosine function for bleaching and a minus-cosine function for induced absorption. The coherent oscillation is explained by a modulated transition dipole moment, which is due to the transfer of an oscillator strength from the intense B-band to the weak Q-band through the ruffling mode with 244cm-1-frequency.

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Kikteva V. R., Kiseleva K. V., Kichin G. A., Skirdkov P. N., and Zvezdin K. A. "Impact of the mutual direction of Polarizer and Free Layer on the auto-oscillation mode of magnetic tunnel junctions (MTJs) of different geometry." Physics of the Solid State 65, no. 6 (2023): 893. http://dx.doi.org/10.21883/pss.2023.06.56097.03h.

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In this work we studied the auto-oscillation mode of structures based on magnetic tunnel junctions. During the experiment we studied how different values and orientation of the magnetic field affect the efficiency of the auto-oscillations regime for samples of various shapes. The auto-oscillation mode in samples was observed near the transition from one state of magnetization of the free layer to another. It was found that the maximum value of the power spectral density and its position relative to the frequency axis can be controlled by changing the magnitude and orientation of the external m

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Smirnov, Alexey, and Boris Smolnikov. "COLLINEAR CONTROL OF OSCILLATION MODES OF SPATIAL DOUBLE PENDULUM WITH VARIABLE GAIN." Cybernetics and Physics, Volume 10, 2021, Number 2 (October 1, 2021): 88–96. http://dx.doi.org/10.35470/2226-4116-2021-10-2-88-96.

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This article is devoted to the study of controlled movements of spatial double pendulum with non-parallel cylindrical joints axes. The collinear control is used to swinging of the system by feedback. The most important property of collinear control is the ability of increasing system oscillations only on one oscillation mode. A modification of the collinear control law with variable gain depending on the energy level is investigated. It allows to control the system motions more flexible than in the case of constant gain. As a result, it is possible to observe a smooth transition from a linear

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8

HASEGAWA, YOSHITAKA, RYUICHIRO TANAKA, and YOSHISUKE UEDA. "ON RATIONAL PHASE-LOCKING OSCILLATIONS OF A SIMPLE SAWTOOTH OSCILLATOR WITH UJT." International Journal of Bifurcation and Chaos 11, no. 12 (2001): 3003–32. http://dx.doi.org/10.1142/s0218127401004121.

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There are some reports about sawtooth oscillations on various systems. The authors constructed the sawtooth oscillator circuit exploiting a Uni-Junction Transistor (UJT), and investigated various nonautonomous-like oscillations induced by an external sinusoidal input. Different from the cases of ordinary differential equation (ODE) systems driven with some periodic oscillation, this input periodically alternates only the threshold of the mode transition. Many systems in various fields of electrical circuits, biology and so on utilize threshold variation or modulation between operational modes,

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9

Iga, Keita. "Transition modes of rotating shallow water waves in a channel." Journal of Fluid Mechanics 294 (July 10, 1995): 367–90. http://dx.doi.org/10.1017/s002211209500293x.

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Normal modes of shallow water waves in a channel wherein the Coriolis parameter and the depth vary in the spanwise direction are investigated based on the conservation of the number of zeros in an eigenfunction. As a result, it is generally shown that the condition for transition modes (Kelvin modes and mixed Rossby-gravity modes) to exist, besides Rossby and Poincaré modes, is determined only by boundary conditions. A Kelvin mode is interpreted as a modification of a Kelvin wave or a boundary wave along a closed boundary, and a mixed Rossby-gravity mode as a modification of an inertial oscill

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10

Aoyagi, Toshio, Takashi Takekawa, and Tomoki Fukai. "Gamma Rhythmic Bursts: Coherence Control in Networks of Cortical Pyramidal Neurons." Neural Computation 15, no. 5 (2003): 1035–61. http://dx.doi.org/10.1162/089976603765202659.

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Much evidence indicates that synchronized gamma-frequency (20–70 Hz) oscillation plays a significant functional role in the neocortex and hippocampus. Chattering neuron is a possible neocortical pacemaker for the gamma oscillation. Based on our recent model of chattering neurons, here we study how gamma-frequency bursting is synchronized in a network of these neurons. Using a phase oscillator description, we first examine how two coupled chattering neurons are synchronized. The analysis reveals that an incremental change of the bursting mode, such as from singlet to doublet, always accompanies

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11

Zhang, Chao, Zhenhua Wan, and Dejun Sun. "Mode transition and oscillation suppression in supersonic cavity flow." Applied Mathematics and Mechanics 37, no. 7 (2016): 941–56. http://dx.doi.org/10.1007/s10483-016-2095-9.

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Serykh, Ilya V., and Dmitry M. Sonechkin. "El Niño–Global Atmospheric Oscillation as the Main Mode of Interannual Climate Variability." Atmosphere 12, no. 11 (2021): 1443. http://dx.doi.org/10.3390/atmos12111443.

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The interannual variability of the global mean monthly anomalies of near-surface air temperature, sea-level pressure, wind speed near the surface, amount of precipitation and total cloudiness was investigated. The amplitudes of the anomalies of these hydrometeorological characteristics between opposite phases of the Global Atmospheric Oscillation (GAO) were calculated. The regional element of the GAO in the tropics of the Indian and Pacific Oceans is the Southern Oscillation. The results show that the oscillations of these characteristics are associated with the GAO not only in the tropical be

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13

VÁSQUEZ FLORES, C., C. H. LENZI, and G. LUGONES. "RADIAL PULSATIONS OF HYBRID NEUTRON STARS." International Journal of Modern Physics: Conference Series 18 (January 2012): 105–8. http://dx.doi.org/10.1142/s201019451200829x.

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In this work we investigate the adiabatic radial oscillations of hybrid stars. We use a relativistic-mean-field model equation of state (EOS) to describe the hadron phase and the Nambu-Jona-Lasinio (NJL) model for the quark matter phase. We integrate the equations of relativistic radial oscillations using different parameterizations for the NJL model and investigate the effect of a first order hadron-quark phase transition on the fundamental oscillation mode. The results show that the period τ of the fundamental mode is characterized by a cusp on the maximum mass and is finite for some configu

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14

Luo, Jianqiang, Siqi Bu, and Jiebei Zhu. "Transition from Electromechanical Dynamics to Quasi-Electromechanical Dynamics Caused by Participation of Full Converter-Based Wind Power Generation." Energies 13, no. 23 (2020): 6270. http://dx.doi.org/10.3390/en13236270.

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Previous studies generally consider that the full converter-based wind power generation (FCWG) is a “decoupled” power source from the grid, which hardly participates in electromechanical oscillations. However, it was found recently that strong interaction could be induced which might incur severe resonance incidents in the electromechanical dynamic timescale. In this paper, the participation of FCWG in electromechanical dynamics is extensively investigated, and particularly, an unusual transition of the electromechanical oscillation mode (EOM) is uncovered for the first time. The detailed math

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15

Hill, Sean, and Giulio Tononi. "Modeling Sleep and Wakefulness in the Thalamocortical System." Journal of Neurophysiology 93, no. 3 (2005): 1671–98. http://dx.doi.org/10.1152/jn.00915.2004.

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When the brain goes from wakefulness to sleep, cortical neurons begin to undergo slow oscillations in their membrane potential that are synchronized by thalamocortical circuits and reflected in EEG slow waves. To provide a self-consistent account of the transition from wakefulness to sleep and of the generation of sleep slow waves, we have constructed a large-scale computer model that encompasses portions of two visual areas and associated thalamic and reticular thalamic nuclei. Thousands of model neurons, incorporating several intrinsic currents, are interconnected with millions of thalamocor

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16

Peppa, Sofia, Lambros Kaiktsis, Christos E. Frouzakis, and George S. Triantafyllou. "Computational Study of Three-Dimensional Flow Past an Oscillating Cylinder Following a Figure Eight Trajectory." Fluids 6, no. 3 (2021): 107. http://dx.doi.org/10.3390/fluids6030107.

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The paper presents a computational study of three-dimensional flow past a cylinder forced to oscillate in a uniform stream, following a figure-eight trajectory. Flow simulations were performed for Re = 400, for different cases, defined in terms of the oscillation mode (‘counter-clockwise’ or ‘clockwise’), for values of the ratio, F, of the transverse oscillation frequency to the Strouhal frequency close to 1.0. The results demonstrate that, for F ≤ 1.0, counter-clockwise cylinder motion is associated with positive power transfer from the flow to the cylinder, corresponding to excitation; for t

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17

Konenkov, NV, MA Korzhavchikov, VA Stepanov, and OE Trunina. "Quadrupole mass filter acceptance in stability island created by double-frequency quadrupole excitation." European Journal of Mass Spectrometry 24, no. 4 (2018): 315–21. http://dx.doi.org/10.1177/1469066718760164.

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Increase in quadrupole mass filter resolution at separation in narrow band stability island (X-band) formed by biharmonic resonance excitation of ion oscillation is discussed. X-band and the normal working quadrupole mass filter modes are compared at theoretical resolution of 10,000 and different separation times. Transmission curves, acceptance ellipses parameters, and acceptance characteristics are obtained by numerical simulation. Transmission coefficients are approximately the same in both modes. Dependence of acceptance ellipses parameters on ion inlet phases has a complicated oscillating

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18

Абдуллина, Г. И., Л. Г. Аскинази, А. А. Белокуров та ін. "Определение локализации альфвеновских колебаний в плазме токамака ТУМАН-3М". Письма в журнал технической физики 44, № 3 (2018): 47. http://dx.doi.org/10.21883/pjtf.2018.03.45578.17063.

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AbstractThe Alfvén oscillations have been studied in ohmically heated deuterium discharges with LH-transition in the TUMAN-3M tokamak in order to clarify their location in a plasma column. The Alfvén oscillation location was determined by comparison of the oscillation frequency measured with magnetic probes and that calculated from local density assuming the typical dispersion relation for Alfvén waves f = (2π)^−1 k _|| v _ A , where v _ A is the Alfvén velocity and k _|| is the the parallel wave number in the direction of the magnetic field. It was found that they are localized in central par

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19

Yu, Z. B., Q. Li, X. Chen, F. Z. Guo, X. J. Xie, and J. H. Wu. "Investigation on the oscillation modes in a thermoacoustic Stirling prime mover: mode stability and mode transition." Cryogenics 43, no. 12 (2003): 687–91. http://dx.doi.org/10.1016/s0011-2275(03)00183-8.

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20

Yeh, Sang-Wook, Yune-Jung Kang, Yign Noh, and Arthur J. Miller. "The North Pacific Climate Transitions of the Winters of 1976/77 and 1988/89." Journal of Climate 24, no. 4 (2011): 1170–83. http://dx.doi.org/10.1175/2010jcli3325.1.

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Abstract This paper examines characteristic changes in North Pacific sea surface temperature (SST) variability during the boreal winter (December–February) for two subperiods (1956–88 and 1977–2009) during which the 1976/77 and the 1988/89 climate transitions occurred. It is found that the Pacific decadal oscillation (PDO)-like SST variability plays a dominant role in the 1976/77 climate transition, while both the North Pacific Gyre Oscillation (NPGO)-like and PDO-like SST variability contribute to the 1988/89 climate transition. Furthermore, the leading mode changes from PDO-like SST variabil

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21

Lindsay, Christopher J., J. M. Joel Ong, and Sarbani Basu. "Near-core Acoustic Glitches Are Not Oscillatory: Consequences for Asteroseismic Probes of Convective Boundary Mixing." Astrophysical Journal 950, no. 1 (2023): 19. http://dx.doi.org/10.3847/1538-4357/acccf5.

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Abstract Asteroseismology has been used extensively in recent years to study the interior structure and physical processes of main-sequence stars. We consider prospects for using pressure modes (p-modes) near the frequency of maximum oscillation power to probe the structure of the near-core layers of main-sequence stars with convective cores by constructing stellar model tracks. Within our mass range of interest, the inner turning point of p-modes as determined by the Jeffreys–Wentzel–Kramers–Brillouin (JWKB) approximation evolves in two distinct phases during the main sequence, implying a sud

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22

Pihnastyi, Oleh, and Svіtlana Chernіavska. "Using the asymptotic approximation of the Maxwell element model for the analysis of stress in a conveyor belt." Eastern-European Journal of Enterprise Technologies 6, no. 7 (114) (2021): 77–84. http://dx.doi.org/10.15587/1729-4061.2021.247526.

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The features of the propagation of dynamic stresses in a conveyor belt, the material properties of which correspond to the Maxwell element model, are considered. Analytical expressions are presented for calculating the dynamic elastic modulus, the loss modulus, and the angle of mechanical loss depending on the frequency of longitudinal oscillations in the belt of an extended transport conveyor. To analyze the dynamic stress propagation process, dimensionless parameters are introduced that characterize the specific features of the viscoelastic process in a conveyor belt, the material properties

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23

TATENO, KATSUMI, HIDEYUKI TOMONARI, HATSUO HAYASHI, and SATORU ISHIZUKA. "PHASE DEPENDENT TRANSITION BETWEEN MULTISTABLE STATES IN A NEURAL NETWORK WITH RECIPROCAL INHIBITION." International Journal of Bifurcation and Chaos 14, no. 05 (2004): 1559–75. http://dx.doi.org/10.1142/s0218127404010138.

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We studied multistable oscillatory states of a small neural network model and switching of an oscillatory mode. In the present neural network model, two pacemaker neurons are reciprocally inhibited with conduction delay; one pacemaker neuron inhibits the other via an inhibitory nonpacemaker interneuron, and vice versa. The small network model shows bifurcations from quasi-periodic oscillation to chaos via period 3 with increase in the synaptic weight of the reciprocal inhibition. The route to chaos in the network model is different from that in the single pacemaker neuron. The network model ex

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24

Zhileykin, Mikhail M., Pavel V. Sirotin, Sergey S. Nosikov, and Nikolay N. Pulyaev. "Method for detecting the loss of stability of the movement of tractors when towing a trailer or a coupled unit." Tractors and Agricultural Machinery 90, no. 1 (2023): 39–48. http://dx.doi.org/10.17816/0321-4443-321266.

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BACKGROUND:Currently, combines and tractors, being the most energy-intensive transport and technological machines for agricultural purposes, largely determine the possibility of transition to an efficient and environmentally friendly agricultural economy, and also provide the technical aspect of the transformation of the agro-industrial complex into the leading sector of the countrys industry. One of the sources of dynamic loads in the units and subsystems of tractor equipment are self-oscillating modes. AIMS:Study of the conditions for the occurrence of self-oscillating processes in the

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25

LO JACONO, DAVID, JUSTIN S. LEONTINI, MARK C. THOMPSON, and JOHN SHERIDAN. "Modification of three-dimensional transition in the wake of a rotationally oscillating cylinder." Journal of Fluid Mechanics 643 (December 24, 2009): 349–62. http://dx.doi.org/10.1017/s0022112009992370.

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A study of the flow past an oscillatory rotating cylinder has been conducted, where the frequency of oscillation has been matched to the natural frequency of the vortex street generated in the wake of a stationary cylinder, at Reynolds number 300. The focus is on the wake transition to three-dimensional flow and, in particular, the changes induced in this transition by the addition of the oscillatory rotation. Using Floquet stability analysis, it is found that the fine-scale three-dimensional mode that typically dominates the wake at a Reynolds number beyond that at the second transition to th

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26

Iwagami, Sho, Ryoya Tabata, Taizo Kobayashi, Yuji Hattori, and Kin’ya Takahashi. "Numerical study on edge tone with compressible direct numerical simulation: Sound intensity and jet motion." International Journal of Aeroacoustics 20, no. 3-4 (2021): 283–316. http://dx.doi.org/10.1177/1475472x211003296.

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A two-dimensional model of the edge tone is studied by a highly accurate and reliable method of direct numerical simulation of the compressible Navier-Stokes equations, and used to verify key features observed in previous experimental and numerical studies, and to discover new features related to the jet motion and the edge tone generation mechanism. The first and second modes of the edge tone that are numerically reproduced agree well with Brown’s equation. In the mode transition region, dynamical mode transition is observed at a fixed jet velocity. For both first and second modes, the pressu

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27

Li, Yang, Jifan Shi, and Kazuyuki Aihara. "Mean-field analysis of Stuart–Landau oscillator networks with symmetric coupling and dynamical noise." Chaos: An Interdisciplinary Journal of Nonlinear Science 32, no. 6 (2022): 063114. http://dx.doi.org/10.1063/5.0081295.

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This paper presents analyses of networks composed of homogeneous Stuart–Landau oscillators with symmetric linear coupling and dynamical Gaussian noise. With a simple mean-field approximation, the original system is transformed into a surrogate system that describes uncorrelated oscillation/fluctuation modes of the original system. The steady-state probability distribution for these modes is described using an exponential family, and the dynamics of the system are mainly determined by the eigenvalue spectrum of the coupling matrix and the noise level. The variances of the modes can be expressed

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28

Гинзбург, Н. С., А. С. Сергеев, Е. Р. Кочаровская, А. М. Малкин, Е. Д. Егорова та В. Ю. Заславский. "Дифракционная селекция мод в гетеролазерах с планарными брэгговскими структурами". Физика и техника полупроводников 54, № 9 (2020): 974. http://dx.doi.org/10.21883/ftp.2020.09.49842.38.

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Within the coupled waves method complemented by quasi-optical approach, we investigate a possibility of diffraction mode selection with respect to the transverse mode index in lasers with planar Bragg resonators. Allowable values of the Fresnel parameter are determined which provide for establishment of stationary single-mode oscillation regime with narrow angle spectrum due to diffraction losses from the edges of the Bragg structure. We show that at larger values of the Fresnel parameter, oscillation stability can be improved by shifting the operating transition frequency to the eigenfrequenc

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29

Palies, Paul, Milos Ilak, and Robert Cheng. "Transient and limit cycle combustion dynamics analysis of turbulent premixed swirling flames." Journal of Fluid Mechanics 830 (October 5, 2017): 681–707. http://dx.doi.org/10.1017/jfm.2017.575.

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Premixed low swirling flames (methane–air and hydrogen–methane–air) are experimentally investigated for three different regimes. Stable, local transient to instability and limit cycle regimes corresponding to three distinct equivalence ratios are considered. Dynamic mode decomposition is applied to the hydrogen–air–methane flame to retrieve the modes frequencies, growth rates and spatial distributions for each regime. The results indicate that a vortical wave propagating along the flame front is associated with the transition from stability to instability. In addition, it is shown that a key e

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30

Kravtsov, S., P. Berloff, W. K. Dewar, M. Ghil, and J. C. McWilliams. "Dynamical Origin of Low-Frequency Variability in a Highly Nonlinear Midlatitude Coupled Model." Journal of Climate 19, no. 24 (2006): 6391–408. http://dx.doi.org/10.1175/jcli3976.1.

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Abstract A novel mechanism of decadal midlatitude coupled variability, which crucially depends on the nonlinear dynamics of both the atmosphere and the ocean, is presented. The coupled model studied involves quasigeostrophic atmospheric and oceanic components, which communicate with each other via a constant-depth oceanic mixed layer. A series of coupled and uncoupled experiments show that the decadal coupled mode is active across parameter ranges that allow the bimodality of the atmospheric zonal flow to coexist with oceanic turbulence. The latter is most intense in the regions of inertial re

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Neverova, G. P., O. L. Zhdanova, and E. Ya Frisman. "Modeling the Dynamics of Predator-Prey Community with Age Structures." Mathematical Biology and Bioinformatics 14, no. 1 (2019): 77–93. http://dx.doi.org/10.17537/2019.14.77.

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A model of the predator-prey community has been proposed with specific stages of individual development and the seasonality of breeding processes. It is assumed each of the species has an age structure with two stages of development. The case typical for the community “Arctic fox – rodents” is modeled. An analytical and numerical study of the model proposed is made. It is shown that periodic, quasi-periodic and chaotic oscillations can occur in the system, as well as a shift in the dynamics mode as a result of changes in the current sizes of the community’s populations. The model proposed demo

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Bejarano, Luis, and Fei-Fei Jin. "Coexistence of Equatorial Coupled Modes of ENSO*." Journal of Climate 21, no. 12 (2008): 3051–67. http://dx.doi.org/10.1175/2007jcli1679.1.

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Abstract To study the regimes of leading ocean–atmosphere coupled modes of relevance to the El Niño–Southern Oscillation (ENSO) phenomenon, a comprehensive eigenmode analysis of an intermediate coupled model linearized with respect to an array of basic states is performed. Different kinds of leading modes are found to coexist and become unstable under wide ranges of basic states and parameter conditions. In particular, the two most important modes have periods of around 4 and 2 yr. They are referred to as the quasi-quadrennial (QQ) and the quasi-biennial (QB) modes, respectively. The positive

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33

Verma, Suyash, Muhammad S. U. Khalid, and Arman Hemmati. "On association of lift generation, wake topology and kinematics of oscillating foils." International Journal of Micro Air Vehicles 14 (January 2022): 175682932110739. http://dx.doi.org/10.1177/17568293211073959.

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The association of lift generation and evolution of wake topology behind an oscillating foil with combined heaving and pitching motion is investigated numerically at a range of bluereduced frequency (0.16 [Formula: see text] 0.48), phase offset (0[Formula: see text] [Formula: see text] 315[Formula: see text]) and Reynolds number (1000 [Formula: see text] 4000). The pitch-dominated kinematics that coincide with the range of [Formula: see text] 120[Formula: see text] and [Formula: see text] 225[Formula: see text] suggests that leading edge vortices are suppressed while trailing edge vortices dom

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Sourav, Kumar, Pavan Kumar Yadav, Phanindra Tallapragada, and Deepak Kumar. "Simultaneous streamwise and cross-stream oscillations of a diamond oscillator at low Reynolds numbers." Physics of Fluids 34, no. 6 (2022): 063601. http://dx.doi.org/10.1063/5.0096416.

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A two-dimensional stabilized space-time finite-element-based in-house solver is used to explore flow around an elastically mounted rigid diamond oscillator undergoing undamped vortex-induced vibrations in transverse and stream-wise directions simultaneously. The computations are carried over a reduced velocity ([Formula: see text]) range of 1–12 keeping the Reynolds number ( Re) and the mass ratio ([Formula: see text]) fixed at 100 and 10, respectively. In the current investigation, a five-branch response behavior with the presence of an “upper branch” is identified, which is absent for transv

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Li, Tianming. "Phase Transition of the El Niño–Southern Oscillation: A Stationary SST Mode." Journal of the Atmospheric Sciences 54, no. 24 (1997): 2872–87. http://dx.doi.org/10.1175/1520-0469(1997)054<2872:ptoten>2.0.co;2.

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Rodriguez-Vera, Geidy, Rosario Romero-Centeno, Christopher L. Castro, and Víctor Mendoza Castro. "Coupled Interannual Variability of Wind and Sea Surface Temperature in the Caribbean Sea and the Gulf of Mexico." Journal of Climate 32, no. 14 (2019): 4263–80. http://dx.doi.org/10.1175/jcli-d-18-0573.1.

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Abstract This work describes dominant patterns of coupled interannual variability of the 10-m wind and sea surface temperature in the Caribbean Sea and the Gulf of Mexico (CS&GM) during the period 1982–2016. Using a canonical correlation analysis (CCA) between the monthly mean anomalies of these fields, four coupled variability modes are identified: the dipole (March–April), transition (May–June), interocean (July–October), and meridional-wind (November–February) modes. Results show that El Niño–Southern Oscillation (ENSO) influences almost all the CS&GM coupled modes, except the trans

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Kang, Qi, Di Wu, Li Duan, et al. "The effects of geometry and heating rate on thermocapillary convection in the liquid bridge." Journal of Fluid Mechanics 881 (October 25, 2019): 951–82. http://dx.doi.org/10.1017/jfm.2019.757.

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The experimental study on thermocapillary convection in liquid bridges of large Prandtl number has been carried out on Tiangong-2 in space. The purpose of these experiments is to study the oscillation instability of thermocapillary convection, and to discover and recognize the mechanism of destabilization of thermocapillary convection in the microgravity environment in space. In this paper, the geometry of a half-floating-zone liquid bridge is featured by the aspect ratio Ar and volume ratio Vr, and its influence on critical conditions of oscillatory thermocapillary convection is studied. More

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ROWLEY, CLARENCE W., TIM COLONIUS, and AMIT J. BASU. "On self-sustained oscillations in two-dimensional compressible flow over rectangular cavities." Journal of Fluid Mechanics 455 (March 25, 2002): 315–46. http://dx.doi.org/10.1017/s0022112001007534.

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Numerical simulations are used to investigate the resonant instabilities in two-dimensional flow past an open cavity. The compressible Navier–Stokes equations are solved directly (no turbulence model) for cavities with laminar boundary layers upstream. The computational domain is large enough to directly resolve a portion of the radiated acoustic field, which is shown to be in good visual agreement with schlieren photographs from experiments at several different Mach numbers. The results show a transition from a shear-layer mode, primarily for shorter cavities and lower Mach numbers, to a wake

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KIM, HWA-MIN, and YOUNG-DAE JUNG. "Transitions in the surface dust-ion-acoustic mode in a self-gravitating semi-bounded magnetized dusty plasma." Journal of Plasma Physics 73, no. 5 (2007): 785–91. http://dx.doi.org/10.1017/s0022377806006283.

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AbstractThe transitions and the self-gravitational effects on the surface dust-ion-acoustic mode are investigated in semi-bounded magnetized dusty plasmas. We find that there is a dust-ion-acoustic resonance mode in small wave number regions. Furthermore, we find that the self-gravitational effects enhance the resonance frequency. However, the surface wave starts to propagate as the wave number increases. The transition position between the resonance oscillation and the wave propagation is shifted to the smaller wave number domain as self-gravitational effects increase. In addition, the resona

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Киктева, В. Р., К. В. Киселева, Г. А. Кичин, П. Н. Скирдков та К. А. Звездин. "Влияние взаимного направления поляризатора и свободного слоя на автогенерацию магнитных туннельных переходов (МТП) разной геометрии". Физика твердого тела 65, № 6 (2023): 932. http://dx.doi.org/10.21883/ftt.2023.06.55646.03h.

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In this work we studied the auto-oscillation mode of structures based on magnetic tunnel junctions. During the experiment we studied how different values and orientation of the magnetic field affect the efficiency of the self-generation regime for samples of various shapes. The auto-oscillation mode in samples was observed near the transition from one state of magnetization of the free layer to another. It was found that the maximum value of the power spectral density and its position relative to the frequency axis can be controlled by changing the magnitude and orientation of the external mag

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Zhan, Feibiao, Yingteng Zhang, Jian Song, and Shenquan Liu. "Canard Mechanism and Rhythm Dynamics of Neuron Models." Mathematics 11, no. 13 (2023): 2874. http://dx.doi.org/10.3390/math11132874.

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Canards are a type of transient dynamics that occur in singularly perturbed systems, and they are specific types of solutions with varied dynamic behaviours at the boundary region. This paper introduces the emergence and development of canard phenomena in a neuron model. The singular perturbation system of a general neuron model is investigated, and the link between the transient transition from a neuron model to a canard is summarised. First, the relationship between the folded saddle-type canard and the parabolic burster, as well as the firing-threshold manifold, is established. Moreover, th

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Brekhov, K. A., N. A. Ilyin, E. D. Mishina, P. A. Prudkovskii, and G. Kh Kitaeva. "The temperature dependence of the photoinduced soft mode in Sn2P2S6 crystal." International Journal of Modern Physics B 33, no. 08 (2019): 1950061. http://dx.doi.org/10.1142/s0217979219500619.

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In this paper, we present the results of the temperature dependence studies of the photoinduced phonon mode which appears in a ferroelectric-semiconductor Sn2P2S6 (SPS) crystal under the influence of femtosecond laser pulses. We show that its behavior reminds the soft mode one near the phase transition. However, the observed decrease in the oscillation frequency in the vicinity of Curie temperature Tc is much weaker than previously reported. This can be explained by the shadowing of the pure soft mode by its interaction with other photoinduced modes.

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Chen, Tao, Songbai Xue, Bo Wang, Peizhuo Zhai, and Weimin Long. "Study on Short-Circuiting GMAW Pool Behavior and Microstructure of the Weld with Different Waveform Control Methods." Metals 9, no. 12 (2019): 1326. http://dx.doi.org/10.3390/met9121326.

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In order to study internal relation among the behavior of the weld pool, the microstructure of weld bead and the waveform of short-circuiting gas metal arc welding (S-GMAW), a high speed photograph-images analysis system was formed to extract characteristics of weld pool behavior. Three representative waveform control methods were used to provide partly and fully penetrated weld pools and beads. It was found that the behavior of the weld pool was related to the instantaneous power density of the liquid bridge at the break-up time. Weld pool oscillation was triggered by the explosion of the liq

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Nabatian, Negar, Xiaofei Xu, and Njuki Mureithi. "POD ANALYSIS OF THREE-DIMENSIONAL HARMONICALLY FORCED WAKE FLOW OF A CIRCULAR CYLINDER." Transactions of the Canadian Society for Mechanical Engineering 39, no. 4 (2015): 789–803. http://dx.doi.org/10.1139/tcsme-2015-0063.

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A 3D numerical simulation of a circular cylinder wake is presented in this paper. The cylinder is harmonically forced in the stream-wise direction. The objective of the present work is to investigate the effect of the oscillation amplitude on the secondary transition of the wake. The frequency of the lift force is then linked to the form of the vortex shedding mode. The relation between these vortex shedding modes using POD analysis of the transverse velocity and the unsteady lift coefficient of 3D simulation is in good agreement with the 2D model. Results show that the 3D spanwise effect, whi

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Hud, V., I. Hevko, O. Lyashuk, O. Hevko, I. Shust, and M. Sokol. "Research of resonance vibrations of the system «Telescopic screw — bulk medium» caused by torsional vibrations." Bulletin of the Karaganda University. "Physics" Series 98, no. 2 (2020): 119–26. http://dx.doi.org/10.31489/2020ph2/119-126.

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The article outlines the relevance of using the principle of telescopy in the process of creation screw conveyors, which nowadays are folded to obtain significant lengths, which makes their designs expensive and structurally unreasonably complicated. It has been shown an experimental equipment, which provides measurement results of the research process in a wide range with high accuracy in an automated control mode with the necessary data capture. Based on the constructed mathematical model, the dependences of the angular perturbation velocity on the physicomechanical and geometric parameters

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Anwar, Muhammad Usman, Maha M. A. Lashin, Niaz B. Khan, et al. "Effect of Variation in the Mass Ratio on Vortex-Induced Vibration of a Circular Cylinder in Crossflow Direction at Reynold Number = 104: A Numerical Study Using RANS Model." Journal of Marine Science and Engineering 10, no. 8 (2022): 1126. http://dx.doi.org/10.3390/jmse10081126.

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This study reports on the numerical analysis of the impact of mass ratio on the Vortex-Induced Vibration (VIV) phenomenon of an elastically rigid cylinder, oscillating freely in a crossflow direction. Reynolds-averaged Navier–Stokes (RANS) equations with (k-ω SST) model were used to analyze the flow behavior, amplitude ratio and vortex shedding patterns. The study was performed at constant Reynold number (Re) = 104 with reduced velocity (Ur) ranging from 2 to 14 and mass ratio (m*) of 2.4 and 11. The mass ratio was defined as the ratio between mass of the vibrating cylinder and mass of the flu

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Dyks, J., P. Weltevrede, and C. Ilie. "Circular polarization in radio pulsar PSR B1451−68: coherent mode transitions and intrabeam interference." Monthly Notices of the Royal Astronomical Society 501, no. 2 (2020): 2156–73. http://dx.doi.org/10.1093/mnras/staa3762.

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ABSTRACT The radio emission of pulsar B1451−68 contains two polarization modes of similar strength, which produce two clear orthogonal polarization angle tracks. When viewed on a Poincaré sphere, the emission is composed of two flux patches that rotate meridionally as a function of pulse longitude and pass through the Stokes V poles, which results in transitions between orthogonal polarization modes (OPMs). Moreover, the ratio of power in the patches is inversed once within the profile window. It is shown that the meridional circularization is caused by a coherent OPM transition (COMT) produce

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Feszty, D., K. J. Badcock, and B. E. Richards. "Utilising CFD in the investigation of high-speed unsteady spiked body flows." Aeronautical Journal 106, no. 1058 (2002): 161–74. http://dx.doi.org/10.1017/s0001924000012963.

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AbstractUnsteady spiked body flows were simulated by a second order time-accurate CFD method. Laminar, axisymmetric flow was considered at Mach 2.21 and Mach 6 freestreams and Reynolds’ numbers based on the blunt body diameter of 0.12 million and 0.13 million, respectively. A spiked forward facing cylinder with spike lengths between LID = 1.00 and LID = 2.40 was used as the model geometry. Following the numerical method’s verification, the individual flow modes of oscillation and pulsation were examined. The frequency of the events was found in good agreement with the experiment, while the pre

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Zhang, Yin, Guodong Ren, Aatef Hobiny, Bashir Ahmad, and Jun Ma. "Mode transition in a memristive dynamical system and its application in image encryption." International Journal of Modern Physics B 34, no. 27 (2020): 2050244. http://dx.doi.org/10.1142/s0217979220502446.

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Chaotic systems can be used for secure communication and image encryption by applying a variety of encryption algorithms. While most of the low-dimensional chaotic systems and maps can be estimated by using phase reconstruction and thus the safety in signal processing and propagation is attacked. In this paper, an initial-dependent dynamical system, which is developed from the Rössler system by adding memristive function and disturbance function on the memristive variable [Formula: see text], is presented for realizing image encryption and bifurcation analysis is supplied in detail. Time-varyi

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Miraval Zanon, A., S. Campana, A. Ridolfi, P. D’Avanzo, and F. Ambrosino. "X-ray study of high-and-low luminosity modes and peculiar low-soft-and-hard activity in the transitional pulsar XSS J12270−4859." Astronomy & Astrophysics 635 (March 2020): A30. http://dx.doi.org/10.1051/0004-6361/201936356.

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XSS J12270−4859 (henceforth J12270) is the first low-mass X-ray binary to exhibit a transition, taking place at the end of 2012, from an X-ray active state to a radio pulsar state. The X-ray emission based on archival XMM-Newton observations is highly variable, showing rapid variations (∼10 s) from a high X-ray luminosity mode to a low mode and back. A flaring mode has also been observed. X-ray pulsations have been detected during the high mode only. In this work we present two possible interpretations for the rapid swings between the high and low modes. In the first scenario, this phenomenon

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