Results 11 to 20 of about 1,550,252 (358)
Journal of Natural FibersThis study investigates the synthesis and characterization of composite materials, pigeon pea stem, and cotton fibers blended in different ratios such as 100/0, 70/30, 60/40, 50/50, 30/70, and 0/100.
Ariharasudhan Subramanian +6 more
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Tunable Perforated Panel Sound Absorbers for Variable Acoustics Room Design
Applied SciencesVariable acoustics systems are promising engineering developments for multi-purpose rooms and workspaces in many buildings. However, due to space requirements associated with most of the tuning devices used for that purpose, these solutions are hardly ...
Jesús Carbajo +7 more
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Optimal Absorption of Acoustic Waves by a Boundary [PDF]
SIAM Journal on Control and Optimization, 2021 In the aim to find the simplest and most efficient shape of a noise absorbing wall to dissipate the acoustical energy of a sound wave, we consider a frequency model described by the Helmholtz equation with a damping on the boundary. The well-posedness of the model is shown in a class of domains with d-set boundaries (N -- 1 $\le$ d < N).
Magoulès, Frédéric +3 more
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Absorption and impedance boundary conditions for phased geometrical-acoustics methods [PDF]
Journal of the Acoustical Society of America, 2012 Cheol-Ho Jeong
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Microwave and Acoustic Absorption Metamaterials
Physical Review Applied, 2022 Wave absorption metamaterials have been an enduring topic over the past two decades, propelled not only by novel scientific advances, but also by their extensive application potential. In this review, we aim to provide some general insights into the absorption mechanism common to both microwave and acoustic systems.
Sichao Qu, Ping Sheng
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Absorption characteristics of large acoustic metasurfaces
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2022 Metasurfaces formed of arrays of subwavelength resonators are often tuned to ‘critically couple’ with incident radiation, so that at resonance dissipative and radiative damping are balanced and absorption is maximized. Such design criteria are typically derived assuming an infinite metasurface, whereas the absorption characteristics of ...
O. Schnitzer, R. Brandão
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An Archaeoacoustics Analysis of Cistercian Architecture: The Case of the Beaulieu Abbey
Acoustics, 2021 The Cistercian order is of acoustic interest because previous research has hypothesized that Cistercian architectural structures were designed for longer reverberation times in order to reinforce Gregorian chants.
Sebastian Duran +2 more
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Coherent perfect absorption at an exceptional point [PDF]
Science, 2021 Description Absorbingly exceptional Most oscillating systems have a resonance or multiple resonances at which they ring out and are most sensitive to excitation. In non-Hermitian systems, open systems with gain and loss, the resonances have been found to
Changqing Wang +3 more
semanticscholar +1 more source
FROM SEA TO SURGERIES, FROM BABBLING BROOKS TO BABY SCANS: BUBBLE ACOUSTICS AT ISVR
Spring Conference Acoustics 2004, 2023 Ultrasound is passed through liquids and tissue both for diagnostic reasons, and in order to produce a material change. The most familiar diagnostic application is the external foetal scanning that is routine in many pregnancies.
TG Leighton
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