Results 61 to 70 of about 16,712,159 (288)

Measurement of High-Frequency Voltage Harmonics above 2 kHz in High-Voltage Networks

Energies
Large-scale renewable energy plants, flexible AC (alternating current) and high voltage DC (direct current) transmission systems, and modern consumer devices utilize power electronics that tend to increase harmonic emissions.
Imanka Dewayalage, Duane A. Robinson, Sean Elphick, Sarath Perera   +3 more
doaj   +1 more source

The WRHE-PWM Strategy With Minimized THD to Suppress High-Frequency Resonance Instability in Railway Traction Power Supply System

IEEE Access, 2019
Aiming at the high-frequency resonance instability phenomenon in high-speed railways and traction network (simplified as “train-network”) system, a new modulation strategy is proposed.
Xinyu Zhang, Jie Chen, Gang Zhang, Ruichang Qiu, Zhigang Liu   +4 more
doaj   +1 more source

Modular Multilevel Converter Switching Frequency Harmonics Analysis and Suppression Through Cell Voltage Control

IEEE Open Journal of Power Electronics, 2020
This paper investigates the impact of reference's bias on the high frequency voltage spectrum for the modular multilevel converters (MMC). Analytical solution of the voltage spectrum under carrier Phase Shifted Pulse Width Modulation (PSPWM) is derived ...
Lu Wang, Yanjun Shi, Matthew Bosworth, Dionne Soto, Michael Steurer   +4 more
doaj   +1 more source

High Frequency Harmonic Cancellation in Ball-screw Drives

Procedia CIRP, 2012
AbstractIn many machining processes cutting forces are of harmonic nature. The frequency content of these forces may extend far beyond the closed-loop bandwidth of the commonly used feed drive controllers. In ball screw drives, high–frequency disturbances may also originate from repetitive errors synchronized with the rotation of the ball screw.
Hosseinkhani, Yasin, Erkorkmaz, Kaan
openaire   +1 more source

Tracking Battery Microstructural Degradation Through Directional Thermal Transport Signatures

Advanced Functional Materials, EarlyView.
In lithium‐ion batteries, heat conduction varies between the through‐plane and in‐plane directions because of the cell's layered structure. Therefore, cell degradation influences thermal conductivity in each direction uniquely due to detailed microstructural and compositional changes.
Mohammad Shoghi Tekmedash, Rituparna Mohanty, Jack Leber, David Nageb, Mirella Richard, Sharan Singh, Amin Reihani   +6 more
wiley   +1 more source

Amplification of high-order harmonics using weak perturbative high-frequency radiation [PDF]

Physical Review A, 2008
8 pages, 2 ...
Fleischer, Avner, Moiseyev, Nimrod
openaire   +2 more sources

Modal Analysis of Light Propagation, Polarization and Diffraction by Cholesteric Liquid Crystal Layers

Advanced Functional Materials, EarlyView.
The analysis of optical eigenmodes in chiral liquid crystal with perpendicular or tilted helical axis, and their correspondence with the external medium, leads to an intuitive understanding of the angle and wavelength dependency of transmissive and reflective diffraction.
Ke Xu, Pouya Nosratkhah, Le Zhou, Shengzhu Yi, Giorgio Manzoni, Kristiaan Neyts   +5 more
wiley   +1 more source

Thermoresponsive Liquid Crystalline Polymer Coatings Programmed by Field‐Induced Topological Defects for Tunable Optical and Topographical Responses

Advanced Functional Materials, EarlyView.
Resonant standing waves generate large‐area lattices of liquid‐crystal topological defects that are permanently encoded into polymer coatings by photopolymerization. The preserved director architecture produces thermally reconfigurable surface topographies while maintaining programmable optical functionality, demonstrating a scalable strategy for ...
Jacques A. Peixoto, Mufeeduzaman Chavilkkadan, Alexander Fusi, Marko Beslać, Dirk J. Broer, Etienne Brasselet, Danqing Liu   +6 more
wiley   +1 more source

Low-frequency harmonics in inlet flow rate play a crucial role in inducing flow instabilities in terminal cerebral aneurysms

Journal of Biomechanical Science and Engineering, 2016
Prediction of rupture status in cerebral aneurysms remains challenging for clinicians, and the important rupture indicator (wall shear stress, WSS) is controversially discussed.
Lijian XU, Atsushi SAITO, Yoko YOKOYAMA, Kenya SATO, Tatsuya SASAKI, Ryuhei YAMAGUCHI, Michiko SUGAWARA, Hao LIU   +7 more
doaj   +1 more source

Microscale Patterning of Ultrahigh‐Viscosity Metallic‐Polymer Composites via Embedded Droplet Writing

Advanced Functional Materials, EarlyView.
A hybrid additive manufacturing platform integrates direct droplet writing of metallic composite with VAT photopolymerization to fabricate architected soft magnetic composites. This approach enables microscale patterning of high‐viscosity materials for programmable actuators, adaptive fluidic devices, and switchable adhesives, offering tunable ...
Yeowon Yoon, Jian Ni, Sungmo Park, Yang Xu, Yong Chen   +4 more
wiley   +1 more source