Results 1 to 10 of about 12,193 (210)

Mutual Aerodynamic Interference Mechanism Analysis of an “X” Configuration Quadcopter

Aerospace, 2021
This paper studies the quadcopter’s mutual interference phenomenon. The flow field of the quadcopter at different flight speeds is simulated by solving the three-dimensional unsteady Reynolds averaged Navier-Stokes equations with sliding mesh methods ...
Jianchuan Ye, Jiang Wang, Peijian Lv
doaj   +1 more source

Panoramic Endocardial Optical Mapping Demonstrates Serial Rotors Acceleration and Increasing Complexity of Activity During Onset of Cholinergic Atrial Fibrillation

Journal of the American Heart Association: Cardiovascular and Cerebrovascular Disease, 2021
Background Activation during onset of atrial fibrillation is poorly understood. We aimed at developing a panoramic optical mapping system for the atria and test the hypothesis that sequential rotors underlie acceleration of atrial fibrillation during ...
Óscar Salvador‐Montañés, Rafael J. Ramirez, Yoshio Takemoto, Steven R. Ennis, Daniel Garcia‐Iglesias, Sicong Wang, Patrick J. Wolfer, Jiang Jiang, Sergey V. Mironov, Sandeep V. Pandit, José Jalife, Omer Berenfeld   +11 more
doaj   +1 more source

AF driver detection in pulmonary vein area by electropcardiographic imaging: Relation with a favorable outcome of pulmonary vein isolation

Frontiers in Physiology, 2023
Pulmonary vein isolation (PVI) is the most successful treatment for atrial fibrillation (AF) nowadays. However, not all AF patients benefit from PVI.
Carlos Fambuena-Santos, Ismael Hernández-Romero, Rubén Molero, Felipe Atienza, Felipe Atienza, Andreu M. Climent, M S. Guillem   +6 more
doaj   +1 more source

Evaluating spatial disparities of rotor sites and high dominant frequency regions during catheter ablation for PersAF patients targeting high dominant frequency sites using non-contacting mapping

Frontiers in Physiology, 2022
Purpose: Several studies have emphasised the significance of high dominant frequency (HDF) and rotors in the perpetuation of AF. However, the co-localisation relationship between both attributes is not completely understood yet.
Mahmoud Ehnesh, Xin Li, Xin Li, Tiago P. Almeida, Tiago P. Almeida, Gavin S. Chu, Gavin S. Chu, Nawshin Dastagir, Peter J. Stafford, Peter J. Stafford, G. André Ng, G. André Ng, Fernando S. Schlindwein, Fernando S. Schlindwein   +13 more
doaj   +1 more source

Fault tolerant control of a three‐phase PMSM by limiting the heat of an inter‐turn fault

IET Electric Power Applications, 2022
Inter‐turn faults are most commonly the initial stator winding fault in power trains with Voltage Source Inverters. Without counteractions, these faults can propagate and cause catastrophic failures in safety critical applications like all‐electric ...
Simon Foitzik, Martin Doppelbauer
doaj   +1 more source

Competitive Drivers of Atrial Fibrillation: The Interplay Between Focal Drivers and Multiwavelet Reentry

Frontiers in Physiology, 2021
BackgroundThere is debate whether human atrial fibrillation is driven by focal drivers or multiwavelet reentry. We propose that the changing activation sequences surrounding a focal driver can at times self-sustain in the absence of that driver. Further,
Richard T. Carrick, Richard T. Carrick, Bryce E. Benson, Oliver R. J. Bates, Peter S. Spector, Peter S. Spector   +5 more
doaj   +1 more source

Baseline-Free Adaptive Crack Localization for Operating Stepped Rotors Based on Multiscale Data Fusion

Sensors, 2020
Crack localization in running rotors is very important and full of challenges for machinery operation and maintenance. Characteristic deflection shapes or their derivatives based methods seem to be promising for crack localization in rotors.
Zhiwen Lu, Shancheng Cao, Rui Yuan, Yong Lv   +3 more
doaj   +1 more source

Predictors of recurrence of atrial tachyarrhythmias after pulmonary vein isolation by functional and structural mapping of nonparoxysmal atrial fibrillation

Journal of Arrhythmia, 2022
Background This study aimed to evaluate the predictors of recurrence of atrial tachyarrhythmias by structural and functional mapping: voltage, dominant frequency (DF), and rotor mapping after a pulmonary vein isolation (PVI) in nonparoxysmal atrial ...
Koji Kumagai, Tsukasa Sato, Yuki Kurose, Takenori Sumiyoshi, Kaoru Hasegawa, Yuko Sekiguchi, Minoru Yambe, Tatsuya Komaru   +7 more
doaj   +1 more source

PWM-based Flux linkage estimation for permanent magnet synchronous machines

The Journal of Engineering, 2019
Monitoring of rotor temperature in permanent magnet synchronous machines (PMSM) is of great importance as high temperature could cause partial or even irreversible demagnetisation of the permanent magnets (PMs).
Shuai Xiao, Antonio Griffo
doaj   +1 more source

Study on the fault ride through critical elements and coordinated control of DFIG's converters

The Journal of Engineering, 2019
The increasing of large-scale wind power integration capacity brings great challenges to the safe operation and management of power grid.
Bingjie Tang, Yongning Chi, Yongning Chi, Xinshou Tian, Yan Li   +4 more
doaj   +1 more source