Results 141 to 150 of about 34,963 (304)

Perspective: Hollow Core Optical Fibres for Ultraviolet and Visible Wavelengths

Advanced Science, EarlyView.
Hollow core optical fibres bypass material constraints that limit optical fibres at ultraviolet and visible wavelengths. However, their challenging fabrication has limited their development, and significant gains in performance remain possible. In this perspective we outline approaches to enable the next generation of fibres for shorter wavelengths ...
Robbie Mears, Kerrianne Harrington, Jonathan C. Knight, William J. Wadsworth, James M. Stone, Tim A. Birks   +5 more
wiley   +1 more source

Higher-Order Dynamic Mode Decomposition to Identify Harmonics in Power Systems

Energies
The proliferation of renewable energy sources and distributed generation systems interfaced to the grid by power electronics systems is forcing us to better understand the issues arising due to the quality of electrical signals generated through these ...
Aboubacar Abdou Dango, Innocent Kamwa, Himanshu Grover, Alexia N’Dori, Alireza Masoom   +4 more
doaj   +1 more source

Determining Additional Power Losses in the Electricity Supply Systems Due to Current's Higher Harmonics

, 2019
The paper reports results of research into the influence of higher harmonics of the power source voltage and the load current on power losses in an electric network.
Hordiienko, D. (Denys), Ryshchenko, I. (Igor), Nerubatskyi, V. (Volodymyr), Plakhtii, O. (Oleksandr), Zinchenko, O. (Olena), Tykhonravov, S. (Sergiy)   +5 more
core  

Effect of Alkyl Chain Length on the Bandgap, Ferroelectric, and Photoelectric Properties of Lead‐Based Molecular Ferroelectrics

Advanced Science, EarlyView.
This study develops a novel 2D molecular ferroelectric [C6N2H18]PbI4 with polarization enhanced photovoltaics. It systematically investigates the effect of alkylamine spacer cation chain lengths on the band gap, ferroelectric, and photoelectric properties, offering new design strategies.
Ganghua Zhang, Jinrong Wen, Ping Chen, Zhibo Chen, Pingying Tang, Dezeng Li, Jingshan Hou, Yongzheng Fang   +7 more
wiley   +1 more source

Operating Properties of the Inductive Current Transformer and Evaluation of Requirements for Its Compliance with the IEC 61869-1 WB2 Class Extension for Frequency up to 20 kHz

Energies
Nanocrystalline material provides an opportunity to improve the wideband performance of inductive current transformers and enables the possibility of ensuring their transformation accuracy for distorted and sinusoidal current from 50 Hz up to 20 kHz ...
Michal Kaczmarek
doaj   +1 more source

Evaluation of ambisonics decoding methods with experimental measurements

Ambisonics is a sound reproduction technique based on the decomposition of the sound field using spherical harmonics. The truncation in the number of coefficients used to recreate the sound field leads to reproduction artifacts which depend on the ...
Fazi, Filippo Maria, Shin, Mincheol, Murillo Gomez, Diego M.   +2 more
core  

3D Large‐Scale Subwavelength‐Resolution Sound Sheet Tomography Based on an Active and Programmable Circular Meta‐Array

Advanced Science, EarlyView.
A programmable 2048‐element circular ultrasound array combined with a compact acoustic lens produces a thin “sound sheet” over a large field of view, and records echoes with wide angular diversity across the ring aperture. Coherence‐enhanced beamforming converts full‐matrix data into high‐contrast tomographic slices, delivering near‐diffraction‐limited
Qiu‐De Zhang, Zi‐Bin Lin, Zhuo Chen, Zhao‐Hui Liu, Jin‐Lian He, Jun‐Jie Song, Long‐Sheng Zeng, Liang Zhou, Ming‐Yue Ding, Yu‐Gui Peng, Ming Yuchi, Xue‐Feng Zhu   +11 more
wiley   +1 more source

Reactive Power Compensation for Single-Phase AC Motors Using Integral Power Theory

Energies
The paper investigates an alternative approach to measuring and compensating reactive power in electric machines, particularly under non-sinusoidal voltage and current waveforms.
Grzegorz Kosobudzki, Daniel Dusza, Marek Pawel Ciurys, Aleksander Leicht   +3 more
doaj   +1 more source

Harmonization and networking in higher education

, 2013
This report is the outcome from joint efforts of SEAMEO RIHED and the Asian Development Bank in looking for new strategies to facilitate harmonisation of regional higher education. With view to the upcoming setting of the ASEAN Community and the increasing pressures brought on most societies by globalization and the rapid regional integration ...
openaire   +1 more source

On the higher approximations of the K-harmonics method

Journal of Mathematical Physics, 1978
Exact formulas for the calculation of two-body central interactions in the K-harmonics method are derived. These formulas hold for any approximations and account for diagonal and off-diagonal matrix elements as well.
openaire   +3 more sources