Results 61 to 70 of about 112,798 (305)

Adaptive Determination of Damping Coefficient for Torsional Vibration Mitigation in Type-4 Wind Turbines Under LVRT Conditions

Energies
With the increasing grid integration of wind turbines, mechanical reliability issues have become more critical. In particular, two-mass drivetrains undergo severe torsional vibrations due to abrupt torque fluctuations during low-voltage ride-through ...
Min-Jun Jo, Ye-Chan Kim, Seung-Ho Song
doaj   +1 more source

Vertical axis wind turbine drive train transient dynamics [PDF]

, 1982
Start up of a vertical axis wind turbine causes transient torque oscillations in the drive train with peak torques which may be over two and one half times the rated torque of the turbine.
Carne, T. G., Clauss, D. B.
core   +1 more source

Nonequilibrium Dynamics of Charged Particles in an Electromagnetic Field: Causal and Stable Dynamics from 1/c Expansion of QED

, 2011
We derive from a microscopic Hamiltonian a set of stochastic equations of motion for a system of spinless charged particles in an electromagnetic (EM) field based on a consistent application of a dimensionful 1/c expansion of quantum electrodynamics (QED)
Fleming, C. H., Hu, B. L., Johnson, P. R.   +2 more
core   +1 more source

Polariton excitation in epsilon-near-zero slabs: transient trapping of slow light [PDF]

, 2013
We numerically investigate the propagation of a spatially localized and quasi-monochromatic electromagnetic pulse through a slab with Lorentz dielectric response in the epsilon-near-zero regime, where the real part of the permittivity vanishes at the ...
Biancalana, Fabio, Ciattoni, Alessandro, Marini, Andrea, Rizza, Carlo, Scalora, Michael   +4 more
core   +2 more sources

Thickness‐Dependent Skyrmion Evolution in Fe3GeTe2 During Magnetization Reversal

Advanced Functional Materials, EarlyView.
Thickness‐ and field‐dependent magnetic domain behavior in 2D van der Waals Fe3GeTe2 is studied using Lorentz TEM and micromagnetic simulations. A patch‐like domain phase evolves from skyrmions during magnetization reversal, and step edges between thickness regions act as pinning sites.
Jennifer Garland, John Fullerton, PeiYu Cai, Rabindra Basnet, Santosh Karki Chhetri, Jin Hu, Elton J. G. Santos, Yue Li, Charudatta Phatak, Amanda Petford‐Long   +9 more
wiley   +1 more source

A Novel VSG Control Strategy With Droop Compensation for Improved Oscillation Damping and Guaranteed Steady-State Performance in Microgrids

IEEE Access
The Virtual Synchronous Generator (VSG) is a widely studied control strategy for Grid-Forming (GFM) converters, enabling frequency support by implementing virtual inertia and damping.
Erico Gurski, Roman Kuiava, Gilney Damm
doaj   +1 more source

Application of fuzzy logic to power system stabilizer [PDF]

, 2008
Power systems stability is a complex problem which was first recognised in 1920 and has been widely investigated by power system engineers ever since.
Abdullah, Shahrum Shah
core  

Near-bandgap wavelength-dependent studies of long-lived traveling coherent longitudinal acoustic phonon oscillations in GaSb/GaAs systems

, 2007
We report first studies of long-lived oscillations in optical pump-probe measurements on GaSb-GaAs heterostructures. The oscillations arise from a photogenerated coherent longitudinal acoustic phonon wave, which travels from the top surface of GaSb ...
A. Wood, I. Perakis, J. K. Furdyna, J. K. Miller, J. Qi, N. Tolk, T. V. Shahbazyan, X. Liu, Y. Xu, Y.-J. Cho   +9 more
core   +1 more source

A MEMS viscometer for unadulterated human blood [PDF]

, 2010
The design and theoretical modelling of an oscillating micro-mechanical-viscometer designed for the measurement of whole unadulterated human blood, is described. The proposed device utilises the dependence of the squeeze-film damping ratio on properties
Andrews, Bandey, Blech, Boskovic, Burg, C.R. Chatwin, Chu, Cross, de Simone, Den Hartog, Fertis, Gabrielson, Hausler, Jones, Kajima, Kim, Kim, Macosko, Oden, O’Neil, P.D. Smith, Petersen, Puers, R.C.D. Young, Roark, Romoscanu, Rosenson, Saulson, Shin, Shin, Singer, Steidel, Vellekoop, Vidic, Wang, Winther   +35 more
core   +1 more source

Unusual Swelling Behavior of Hydrogels Modified with Spiropyran as Appendage or Crosslinker

Advanced Functional Materials, EarlyView.
Not so innocent after all—spiropyran crosslinkers in methylenebisacrylamide‐crosslinked poly(acrylamide‐co‐acrylic acid) hydrogels increase crosslinking density, but also, counterintuitively, increase swelling. Charge complexation, cooperative chemo‐mechanical effects, and aggregation may explain these observations.
Michael M. Lerch, Ankita Shastri, Thomas B. H. Schroeder, Amos Meeks, Shucong Li, Anna V. Shneidman, Michael Aizenberg, Joanna Aizenberg   +7 more
wiley   +1 more source