Results 21 to 30 of about 136,212 (303)

Oscillation results for a fractional partial differential system with damping and forcing terms

open access: yesAIMS Mathematics, 2023
In this paper, we study the forced oscillation of solutions of a fractional partial differential system with damping terms by using the Riemann-Liouville derivative and integral.
A. Palanisamy   +4 more
doaj   +1 more source

Transitional Characteristics of Phase Shift in Lock-in Phenomena of an Oscillating Cylinder

open access: yesJournal of Fluid Science and Technology, 2009
In this study, characteristics of phase lag between displacement of forcibly oscillating test body and velocity fluctuation caused by vortex formation behind the test body were investigated.
Hiroyuki HANIU   +4 more
doaj   +1 more source

Forced Oscillation Source Location via Multivariate Time Series Classification

open access: yes, 2017
Precisely locating low-frequency oscillation sources is the prerequisite of suppressing sustained oscillation, which is an essential guarantee for the secure and stable operation of power grids. Using synchrophasor measurements, a machine learning method
Bian, Desong   +4 more
core   +1 more source

Using Effective Generator Impedance for Forced Oscillation Source Location

open access: yes, 2018
Locating the sources of forced low-frequency oscillations in power systems is an important problem. A number of proposed methods demonstrate their practical usefulness, but many of them rely on strong modeling assumptions and provide poor performance in ...
Chevalier, Samuel   +2 more
core   +1 more source

Duffing revisited: Phase-shift control and internal resonance in self-sustained oscillators [PDF]

open access: yes, 2015
We address two aspects of the dynamics of the forced Duffing oscillator which are relevant to the technology of micromechanical devices and, at the same time, have intrinsic significance to the field of nonlinear oscillating systems.
Arroyo, Sebastián I.   +1 more
core   +2 more sources

Amplification of Quantum Meson Modes in the Late Time of Chiral Phase Transition

open access: yes, 2004
It is shown that there exists a possibility of amplification of amplitudes of quantum pion modes with low momenta in the late time of chiral phase transition by using the Gaussian wave functional approximation in the O(4) linear sigma model.
Nishiyama, S., Tsue, Y., Watanabe, K.
core   +2 more sources

Time-Evolution of Collective Meson Fields and Amplification of Quantum Meson Modes in Chiral Phase Transition [PDF]

open access: yes, 2002
The time evolution of quantum meson fields in the O(4) linear sigma model is investigated in a context of the dynamical chiral phase transition. It is shown that amplitudes of quantum pion modes are amplified due to both mechanisms of a parametric ...
Hiro-Oka   +8 more
core   +3 more sources

Numerical investigation of vortex shedding and vortex-induced vibration for flexible riser models

open access: yesInternational Journal of Naval Architecture and Ocean Engineering, 2010
The numerical study about the vortex-induced vibration and vortex shedding in the wake has been presented. Prior to the numerical simulation of flexible riser systems concerning engineering conditions, efficiency validating of the proposed FSI solution ...
Zheng-Shou Chen, Wu-Joan Kim
doaj   +1 more source

Nonlinear gas oscillations in pipes. Part 1. Theory [PDF]

open access: yes, 1973
The problem of forced acoustic oscillations in a pipe is studied theoretically. The oscillations are produced by a moving piston in one end of the pipe, while a variety of boundary conditions ranging from a completely closed to a completely open mouth at
Jimenez, J.
core   +1 more source

Tunable Oscillations in the Purkinje Neuron

open access: yes, 2011
In this paper, we study the dynamics of slow oscillations in Purkinje neurons in vitro, and derive a strong association with a forced parametric oscillator model.
A. L. Hodgkin   +14 more
core   +1 more source

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