Results 71 to 80 of about 13,287 (308)

Improvement Of Power Quality In Hvdc Transmission Systems With Auxiliary Converters

Eletrônica de Potência, 2007
This paper intends to discuss some practical results of the reverse-use of the harmonic distortion energy from idle periods in conventional HVDC converters.
J. B Parizzi, F. A Farret, A. B. Serdotte   +2 more
doaj   +1 more source

Optical Signature of Moiré Superlattices Formed by Twisted SrTiO3 Membranes

Advanced Functional Materials, EarlyView.
We discover optical signatures from bonded interfaces in twisted SrTiO3 moiré superlattices, including low‐frequency Raman vibrational modes and strong second‐harmonic generation, consistent with strong interlayer coupling inferred from cross‐sectional electron microscopy and ab initio calculations. ABSTRACT Moiré superlattices formed at the interfaces
T. A. M. Ragib Shahriar, Fumikazu Murakami, Xing He, Konnor Koons, Xinyan Li, Bumseop Kim, Shihan Qin, Varun Harbola, Jochen Mannhart, Yimo Han, Ruijuan Xu, Shengxi Huang, Andrew M. Rappe, Hanyu Zhu   +13 more
wiley   +1 more source

Engineering of Crystallinity to Amplify Chiroptical Activity of TiO2 Nanohelices for Enhancing Dissymmetric Circularly Polarized Photocatalysis

Advanced Functional Materials, EarlyView.
Enhancing crystallinity through thermal annealing leads to amplifying the chiroptical activity of TiO2 nanohelices (NHs) fabricated by glancing angle deposition, ascribed to the suppression of charge trapping. The enhanced chiroptical activity can be converted into pronounced dissymmetric photocatalytic kinetics of circularly polarized photocatalysis ...
Ying Wang, Lin Yang, Junjun Liu, Zhifeng Huang   +3 more
wiley   +1 more source

Active Power Filter With Automatic Control Circuit For Neutral Current Harmonic Minimization Technique [QC446.3.H37 I98 2007 f rb]. [PDF]

, 2007
Disertasi ini bertujuan untuk membangun penuras kuasa aktif yang cekap dan boleh dipercayai bagi meminimumkan lebihan harmonik arus neutral dan juga masalah harmonik di dalam talian neutral untuk sistem tiga fasa empat dawai. The aim of this thesis
A Bakar, Mohd Izhar
core  

Robust Interlayer Exciton Interplay in a Twisted van der Waals Heterotrilayer on a Broadband Bragg Reflector up to Room Temperature

Advanced Functional Materials, EarlyView.
In this work, we highlight a unique material platform capable of producing three distinct room temperature (RT) photoluminescence (PL) resonances from spatially separated regions composed of a heterobilayer (HBL), a homobilayer (HoBL), and an heterotrilayer (HTL) transition metal dichalcogenide (TMD) heterostructures configuration on a highly ...
Bhabani Sankar Sahoo, Shachi Machchhar, Avijit Barua, Martin Podhorský, Seth Ariel Tongay, Takashi Taniguchi, Kenji Watanabe, Chirag Chandrakant Palekar, Stephan Reitzenstein   +8 more
wiley   +1 more source

High power pulsed ytterbium doped fibre lasers and their applications [PDF]

, 2011
The aim of my project is to develop pulsed Ytterbium (Yb) doped fibre master oscillator power amplifier (MOPA) systems seeded by semiconductor lasers. I was principally focused on two specific projects aligned to sponsored programs of research within the
Chen, Kang Kang
core  

Assessing the efficiency of measures to enhance electric power quality in variable-frequency drive for scraper conveyors

Горные науки и технологии
The intensive implementation of variable-frequency drive machines and installations in underground mining processes necessitates addressing several issues, with a primary focus on ensuring the quality of electric power.
V. L. Petrov, A. V. Pichuev
doaj   +1 more source

Comparison of Active Power Filter and Passive Power Filter in Harmonic Mitigation in Power System Network

ELEKTRIKA- Journal of Electrical Engineering
The power quality of an electrical system is greatly impacted by harmonics, which are undesirable voltage and current waveforms that distort the sinusoidal waveform of the fundamental frequency. Harmonics, if not filtered, can damage electrical equipment, raise electric bills, and impair product quality and productivity.
MUHAMMAD ZAKARIA ROZMAN, RASYIDAH BINTI IDRIS   +1 more
openaire   +1 more source

Giant Electrostriction in Halide Perovskites Revisited With Double‐Modulation Interferometry

Advanced Functional Materials, EarlyView.
A giant electrostrictive effect in lead halide perovskites had been reported previously. This work uses sensitive interferometry to measure the electromechanical response of various halide perovskite samples. The results reveal no intrinsic electrostrictive compression. Instead, the materials expand primarily under an applied electric field as a result
Philipp Ramming, Markus Griesbach, Ralf Moos, Lothar Kador, Anna Köhler   +4 more
wiley   +1 more source

Controlling harmonic distortion in power electronics using active power filters [PDF]

, 2013
University of Minnesota M.S. thesis. May 2013. Major: Electrical Engineering. Advisor: Ned Mohan. 1 computer file (PDF); vi, 44 pages.Power electronics are used in power systems extensively for power conversion and control, but can generate harmonic ...
Reinhart, John
core