Results 101 to 110 of about 18,994,398 (235)

Vibrational ratchets

open access: yes, 2006
Transport in a one-dimensional symmetric device can be activated by the combination of thermal noise and a bi-harmonic drive. For the study case of an overdamped Brownian particle diffusing on a periodic one-dimensional substrate, we distinguish two ...
Borromeo, M., Marchesoni, F.
core   +1 more source

Frequency-dependent ratchet effect in superconducting films with a tilted washboard pinning potential

open access: yes, 2011
The influence of an ac current of arbitrary amplitude and frequency on the mixed-state dc-voltage-ac-drive ratchet response of a superconducting film with a dc current-tilted uniaxial cosine pinning potential at finite temperature is theoretically ...
K. K. Likharev   +3 more
core   +1 more source

Blending HVDC-Link Energy Storage and Offshore Wind Turbine Inertia for Fast Frequency Response

open access: yesIEEE Transactions on Sustainable Energy, 2015
This paper explores the benefits of combining the dc-link energy storage of a voltage source converter-based high-voltage dc (VSC-HVDC) link and the kinetic energy storage from wind turbines to facilitate in fast primary frequency control and system ...
A. Junyent‐Ferré   +2 more
semanticscholar   +1 more source

Dynamic Analysis of AFM in Air and Liquid Environments Considering Linear and Non-linear Interaction Forces by Timoshenko Beam Model [PDF]

open access: yesInternational Journal of Advanced Design and Manufacturing Technology, 2015
The atomic force microscopy of the cantilever beam frequency response behaviour in the liquid environment is different in comparison with air environment.
P. Maleki Moghadam Abyaneh   +3 more
doaj  

X-ray-frequency modulation via periodic switching of an external magnetic field

open access: yes, 2018
Single x-ray photons can be resonantly scattered and stored with the help of suitable transitions in the atomic nucleus. Here, we investigate theoretically means of mechanical-free modulation for the frequency spectra of such x-ray photons via periodic ...
Gunst, Jonas   +3 more
core   +1 more source

An analytical approach for power system frequency stability evaluation

open access: yesIET Generation, Transmission & Distribution
Recent years have seen high penetration of renewable energies, which have significantly reduced the inertia of bulk power systems. As a result, the frequency behaviour of power systems is becoming more complex.
Zhenyao Li, Jing Li, Deqiang Gan
doaj   +1 more source

Frequency response in short thermocouple wires [PDF]

open access: yes
Theoretical expressions are derived for the steady state frequency response of a thermocouple wire. In particular, the effects of axial heat conduction are demonstrated for a nonuniform wire with unequal material properties and wire diameters across the ...
Forney, L. J.   +3 more
core   +1 more source

Negative high-frequency differential conductivity in semiconductor superlattices

open access: yes, 2002
We examine the high-frequency differential conductivity response properties of semiconductor superlattices having various miniband dispersion laws. Our analysis shows that the anharmonicity of Bloch oscillations (beyond tight-binding approximation) leads
Andronov A. A.   +10 more
core   +1 more source

Phase and frequency response theory for chaotic oscillators

open access: yes, 2017
While phase response theory for limit cycle oscillators is a well established tool for the study of synchronization with predictive powers beyond simple linear response, an analogous, unified approach for the study of phase synchronization for autonomous
Kori, Hiroshi, Tönjes, Ralf
core  

Quantum critical response: from conformal perturbation theory to holography

open access: yes, 2017
We discuss dynamical response functions near quantum critical points, allowing for both a finite temperature and detuning by a relevant operator. When the quantum critical point is described by a conformal field theory (CFT), conformal perturbation ...
Lucas, Andrew   +2 more
core   +1 more source

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