Results 101 to 110 of about 66,116 (307)

Qualitative properties of a third-order differential equation with a piecewise constant argument

open access: yesElectronic Journal of Differential Equations, 2017
We consider a third order differential equation with piecewise constant argument and investigate oscillation, nonoscillation and periodicity properties of its solutions.
Huseyin Bereketoglu   +2 more
doaj  

A Functional 2D Carbon Allotrope Combining Nanoporous Graphene and Biphenylene Segments

open access: yesAdvanced Materials, EarlyView.
The synthesis of a novel nanoporous graphene (NPG) is reported with biphenylene segments via thermal fusion of 12‐armchair porous graphene nanoribbons grown on gold surfaces. Characterization using STM, AFM, and DFT reveals low‐defect semiconducting behaviour and tunable band gaps.
Paula Angulo‐Portugal   +14 more
wiley   +1 more source

An Improved Method of MPPT of Photovoltaic Array

open access: yesGong-kuang zidonghua, 2011
In view of problems existed in common control methods of constant voltage method, disturbance observation method and conductance adding method in MPPT of photovoltaic array, the paper proposed a fast MPPT control method which combines constant voltage ...
XU Rui-dong, HU Yi-hua, CHEN Hao, ZUO La
doaj  

Opportunities of Semiconducting Oxide Nanostructures as Advanced Luminescent Materials in Photonics

open access: yesAdvanced Materials, EarlyView.
The review discusses the challenges of wide and ultrawide bandgap semiconducting oxides as a suitable material platform for photonics. They offer great versatility in terms of tuning microstructure, native defects, doping, anisotropy, and micro‐ and nano‐structuring. The review focuses on their light emission, light‐confinement in optical cavities, and
Ana Cremades   +7 more
wiley   +1 more source

Intelligent Acousto‐Electrical Metamaterials (IAM) for Sound Source Detection

open access: yesAdvanced Materials, EarlyView.
Our proposed metamaterial concept enables sound source detection using a single material, in contrast to conventional arrays that require dozens or even hundreds of transducers. We show that the coupled acoustic–vibrational–electrical responses in piezoelectric metamaterials give rise to topology‐governed charge transport, producing distinct voltage ...
Victor Couëdel   +7 more
wiley   +1 more source

Self-excited flow oscillation in an abruptly expanding circular duct as the noise source

open access: yesArchives of Acoustics, 2016
The behaviour of oscillations in subsonic flow in a duct with a sudden enlargement of cross-section has been investigated experimentally. The mechanism of one type of oscillation has been found and explained.
Andrzej P. SZUMOWSKI, Janusz PIECHNA
doaj  

constant oscillation-amplitude method

open access: yes
Citation: 'constant oscillation-amplitude method' in the IUPAC Compendium of Chemical Terminology, 5th ed.; International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.12753 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for ...
openaire   +1 more source

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