Results 31 to 40 of about 674,821 (271)

Optimization of constant power control of wind turbines to provide power reserves [PDF]

, 2013
In several countries, the wind power penetration increased tremendously in the last years. As the current wind turbines do not participate in frequency control nor reserve provision, this may compromise the proper functioning of the primary control and ...
De Kooning, Jeroen, Meersman, Bart, Van de Vyver, Jan, Vandevelde, Lieven, Vandoorn, Tine   +4 more
core   +1 more source

Frequency Coordinated Control Strategy for an HVDC Sending-End System with Wind Power Integration Based on Fuzzy Logic Control

Energies, 2021
Under the background of high wind power permeability, the frequency regulation capability of high voltage direct current (HVDC) sending-end system tends to deteriorate.
Yuhong Wang, Jie Zhu, Qi Zeng, Zongsheng Zheng, Guangyuan Yu, Aihui Yin   +5 more
doaj   +1 more source

Sensored and sensorless speed control methods for brushless doubly fed reluctance motors [PDF]

, 2009
The study considers aspects of scalar V/f control, vector control and direct torque (and flux) control (DTC) of the brushless doubly fed reluctance machine (BDFRM) as a promising cost-effective alternative to the existing technological solutions for ...
Abad, Abad, Abad, Arnalte, Bauer, Betz, Betz, Betz, Brassfield, Datta, Dorrell, Jovanović, Jovanović, Jovanović, Jovanović, Jovanović, Jovanović, Jovanović, Jovanović, Liang, Liao, Liao, Liao, Lorenz, M. Jovanovic, McMahon, Morel, Ojo, Poza, Roberts, Saifkhani, Schulz, Takahashi, Takahashi, Wallace, Wang, Williamson, Xu, Xu, Xu, Zhi   +40 more
core   +1 more source

Lower limb muscle fatigue after uphill walking in children with unilateral spastic cerebral palsy

PLoS ONE, 2022
Fatigue during walking is a common complaint in cerebral palsy (CP). The primary purpose of this study is to investigate muscle fatigue from surface electromyography (sEMG) measurements after a treadmill-based fatigue protocol with increasing incline and
I. Moll, J. M. N. Essers, R. G. J. Marcellis, R. H. J. Senden, Y. J. M. Janssen-Potten, R. J. Vermeulen, K. Meijer   +6 more
doaj   +2 more sources

Simplified dc to dc converter [PDF]

, 1984
A dc to dc converter which can start with a shorted output and which regulates output voltage and current is described. Voltage controlled switches directed current through the primary of a transformer the secondary of which includes virtual reactance ...
Gruber, R. P.
core   +1 more source

Relaxation and breakup of an initially extended drop in an otherwise quiescent fluid [PDF]

, 1989
In this paper we examine some general features of the time-dependent dynamics of drop deformation and breakup at low Reynolds numbers. The first aspect of our study is a detailed numerical investigation of the ‘end-pinching’ behaviour reported in a ...
Leal, L. G., Stone, H. A.
core   +1 more source

By dawn or dusk—how circadian timing rewrites bacterial infection outcomes

FEBS Letters, EarlyView.
The circadian clock shapes immune function, yet its influence on infection outcomes is only beginning to be understood. This review highlights how circadian timing alters host responses to the bacterial pathogens Salmonella enterica, Listeria monocytogenes, and Streptococcus pneumoniae revealing that the effectiveness of immune defense depends not only
Devons Mo, Catherine S. Palmer, Jacqueline M. Kimmey   +2 more
wiley   +1 more source

A Two-Stage Coordinated Frequency Regulation Strategy for Wind Turbines Considering Secondary Frequency Drop and Rotor Speed Recovery

Energies
The capability of wind turbines (WTs) to provide frequency response is crucial for future power systems with high wind power penetration. Existing strategies primarily focus on mitigating initial and secondary frequency drop (SFD), often overlooking the ...
Yufei Han, Yibo Zhou, Kexin Li
doaj   +1 more source

Level of adherence to prescribed exercise in spondyloarthritis and factors affecting this adherence: a systematic review [PDF]

, 2019
Adherence is a primary determinant of the effectiveness of any intervention. Exercise is considered essential in the management of spondyloarthritis (SpA); however, the overall adherence to exercise programmes and factors affecting adherence are unknown.
Coulter, EH, McDonald, DA, McDonald, MT, Paul, L, Siebert, S   +4 more
core   +2 more sources

Disordered but rhythmic—the role of intrinsic protein disorder in eukaryotic circadian timing

FEBS Letters, EarlyView.
Unstructured domains known as intrinsically disordered regions (IDRs) are present in nearly every part of the eukaryotic core circadian oscillator. IDRs enable many diverse inter‐ and intramolecular interactions that support clock function. IDR conformations are highly tunable by post‐translational modifications and environmental conditions, which ...
Emery T. Usher, Jacqueline F. Pelham
wiley   +1 more source