Results 91 to 100 of about 18,994,398 (235)

The Fractional Orthogonal Derivative

Mathematics, 2015
This paper builds on the notion of the so-called orthogonal derivative, where an n-th order derivative is approximated by an integral involving an orthogonal polynomial of degree n.
Enno Diekema
doaj   +1 more source

Analysis of a duffing oscillator that exhibits hysteresis with varying excitation frequency and amplitude [PDF]

, 2007
Hysteresis, or jump phenomenon, are a common and severe nonlinear behaviour associated with the Duffing oscillator and the multi-valued properties of the response solution.
Billings, S.A., Li, L.M.
core   +1 more source

Power System Frequency Response From the Control of Bitumen Tanks

IEEE Transactions on Power Systems, 2016
Bitumen tanks were tested to investigate the capability of industrial heating loads to provide frequency response to an electric power system. A decentralized control algorithm was developed enabling the tanks to alter their power consumption in ...
Meng Cheng, Jianzhong Wu, Stephen J. Galsworthy, C. E. Ugalde-Loo, N. Gargov, W. Hung, N. Jenkins   +6 more
semanticscholar   +1 more source

A Study on Improving Switching Characteristics According to a Circuit Analysis Technique in Converter Applications Using Gallium Nitride Field Effect Transistors

Energies, 2019
In this paper, we studied how the switching characteristics of a power conversion system could be improved using gallium nitride (GaN) devices.
Tae-Kue Kim
doaj   +1 more source

A finite element-analytical method for modeling a structure in an infinite fluid [PDF]

, 1976
A method is described from which the interaction of an elastic structure with an infinite acoustic fluid is determined. The displacements of the structure and the pressure field of the immediate surrounding fluid are modeled by finite elements, and the ...
Zarda, P. R.
core   +1 more source

Low frequency response of a collectively pinned vortex manifold

, 2001
A low frequency dynamic response of a vortex manifold in type-II superconductor can be associated with thermally activated tunneling of large portions of the manifold between pairs of metastable states (two-level systems).
A.E. Koshelev, A.I. Larkin, D.S. Fisher, D.S. Fisher, D.S. Fisher, D.S. Fisher, E. Pytte, G. Blatter, J. Pearl, K.H. Fischer, L. Balentz, L. Lundgren, L.B. Ioffe, M. Calame, M. Kardar, M. Mézard, M. Mézard, M.P.A. Fisher, M.V. Feigel’man, M.V. Feigel’man, S. E. Korshunov, T. Halpin-Healy, T. Halpin-Healy, U. Schulz, V.M. Vinokur, V.M. Vinokur, Vik.S. Dotsenko   +26 more
core   +1 more source

Characterisation of Harmonic Resonance Phenomenon of Multi-Parallel PV Inverter Systems: Modelling and Analysis

Energies
Solar PV inverters require output filters to reduce unwanted harmonics in their output, where LCL filters are a more economical choice than larger inductance-only filters. A drawback of these filters is that they can introduce power quality disturbances,
Kasun Peiris, Sean Elphick, Jason David, Duane Robinson   +3 more
doaj   +1 more source

Low Frequency Nonlinear Magnetic Response of an Unconventional Superconductor

, 1998
We consider an unconventional superconductor in a low frequency harmonic magnetic field. In the Meissner regime at low T a nonlinear magnetic response arises from quasiparticle excitations near minima in the energy gap.
A. V. Balatsky, B. P. Stojković, D. A. Bonn, D. F. Agterberg, D. J. Scalapino, D. J. Van Harligen, D. Xu, D. Zech, F. London, G. Kotliar, H. Mayaffre, I. Žutić, I. Žutić, I. Žutić, I. Žutić, Igor Žutić, J. A. Sauls, J. F. Annett, J. J. Betouras, J. R. Kirtley, K. A. Kouznetsov, K. A. Musaelian, K. A. Müller, K. Ishida, K. Kanoda, K. Maki, M. Covington, M. Fogelström, M. H. S. Amin, M. Sigrist, N. Schopohl, Oriol T. Valls, P. A. Lee, P. J. Hirschfeld, P. Kumar, Q. P. Li, S. K. Yip, S. R. Bahcall, T. Dahm, T. Dahm, T. P. Orlando, V. G. Kogan, V. G. Kogan, W. Xu, Y. Nakatawa   +44 more
core   +1 more source

A simplified method for estimating bridge frequency effects considering train mass

Frontiers in Built Environment
The dynamic response of a railway bridge depends on several parameters; the primary parameter is the fundamental natural frequency of vibration of the bridge itself.
Aminur K. Rahman, Boulent Imam, Donya Hajializadeh   +2 more
doaj   +1 more source

A loudspeaker response interpolation model based on one-twelfth octave interval frequency measurements [PDF]

, 2005
A practical loudspeaker frequency response interpolation model is developed using a modification of the Tuneable Approximate Piecewise Linear Regression (TAPLR) model that can provide a complete magnitude and phase response over the full frequency range ...
Zaknich, A.
core   +1 more source