Results 11 to 20 of about 368,669 (336)
Noise filter using a periodic system of dual Helmholtz resonators
Scientific ReportsThis study investigates noise reduction using a periodic arrangement of dual Helmholtz resonators and explores the introduction of defects within this periodic structure. The transfer matrix method was employed to carry out theoretical research.
Mohamed El Malki +3 more
doaj +2 more sources
Design, Manufacturing, and Acoustical Analysis of a Helmholtz Resonator-Based Metamaterial Plate
Acoustics, 2021 Acoustic metamaterials are materials artificially engineered to control sound waves, which is not possible with conventional materials. We have proposed a design of an acoustic metamaterial plate with inbuilt Helmholtz resonators.
Sourabh Dogra, Arpan Gupta
doaj +2 more sources
Plate-type acoustic metamaterials with integrated Helmholtz resonators
Applied Acoustics, 2022 Plate-type acoustic metamaterials (PAM) consist of a thin film with periodically added masses. These metamaterials can be designed to be very lightweight and exhibit narrow bands at low frequencies with high sound transmission loss values that can exceed ...
F. Langfeldt, A.J. Khatokar, W. Gleine
semanticscholar +1 more source
Influence of riblet shapes on the occurrence of Kelvin–Helmholtz rollers
Journal of Fluid Mechanics, 2021 We investigate turbulent flow over streamwise-aligned riblets (grooves) of various shapes and sizes. Small riblets with spacings of typically less than $20$ viscous units are known to reduce skin-friction drag compared to a smooth wall, but larger ...
S. Endrikat +4 more
semanticscholar +1 more source
Acoustic multi-layer Helmholtz resonance metamaterials with multiple adjustable absorption peaks
Applied Physics Letters, 2021 The single Helmholtz resonator obtains only one absorption peak in the broad frequency range, which limits its application in reducing the noise with multiple spectra. This paper reports an acoustic multi-layer Helmholtz resonance metamaterial, which can
H. Duan +5 more
semanticscholar +1 more source
Science Advances, 2020 Change in water chemisorption in response to electrode potential leads to negative capacitance in electric double layer. Electrified solid/liquid interfaces are the key to many physicochemical processes in a myriad of areas including electrochemistry and
Jia-Bo Le +3 more
semanticscholar +1 more source
Kelvin-Helmholtz instability governs the cavitation cloud shedding in Venturi microchannel
, 2021 The paper shows visualization of cavitation inside a micro-Venturi channel. While the initial aim of the study was to establish supercavitating conditions inside a micro-Venturi, yet we found that this regime is suppressed due to the formation of a ...
D. Podbevšek +3 more
semanticscholar +1 more source
KNH2 - KH: a metal amide - hydride solid solution [PDF]
, 2016 We report for the first time the formation of a metal amide-hydride solid solution. The dissolution of KH into KNH2 leads to an anionic substitution, which decreases the interaction among NH2 - ions.
Baricco, Marcello +15 more
core +4 more sources
Design of a Nanometric AlTi Additive for MgB2-Based Reactive Hydride Composites with Superior Kinetic Properties [PDF]
, 2018 Solid-state hydride compounds are a promising option for efficient and safe hydrogen-storage systems. Lithium reactive hydride composite system 2LiBH4 + MgH2/2LiH + MgB2 (Li-RHC) has been widely investigated owing to its high theoretical hydrogen-storage
Akiba, Etsuo +17 more
core +2 more sources