Results 61 to 70 of about 2,694 (304)

Geometrical Acoustics in a Heterogeneous Anisotropic Elastic Solid: Application to a Wavy Composite

, 1998
Karal and Keller [1] developed the geometrical acoustics for wave propagation in a heterogeneous isotropic medium, generally adopting the methods used in geometrical optics [2,3].
Wolfgang Sachse, Kwang Yul Kim, Wei Zou, Kim, Kwang Yul, Zou, Wei, Sachse, Wolfgang   +5 more
core   +1 more source

Geometrical acoustics of Lamb waves [PDF]

, 2019
In the present work, an overview of the developments of the geometrical acoustics (GA) theory of Lamb waves in plates of variable thickness is given, based mainly on the original results of the present author.
Victor V. Krylov (1252356)
core   +1 more source

Ultrasmall High‐Entropy Materials: Nanoscale Effects, Synthesis, and Mechanistic Insights

Advanced Functional Materials, EarlyView.
This review article focuses on sub‐10 nm high‐entropy materials that combine nanoscale design with complex compositions for next‐generation applications. ABSTRACT Ultrasmall high‐entropy nanomaterials (USHENMs, <10 nm) merge multicomponent chemistry with size‐dependent effects, forming a distinct class of materials with unprecedented properties.
Yueyue He, Wenbo Wang, Simon Schweidler, Yanjiao Ma, Ben Breitung, Torsten Brezesinski   +5 more
wiley   +1 more source

Conformally Mapped Multifunctional Acoustic Metamaterial Lens for Spectral Sound Guiding and Talbot Effect

Research, 2019
We demonstrate a conformally mapped multifunctional acoustic metamaterial Mikaelian lens. Mikaelian lens is a gradient medium with a hyperbolic secant refractive index profile that can realize functions like beam self-focusing.
He Gao, Xinsheng Fang, Zhongming Gu, Tuo Liu, Shanjun Liang, Yong Li, Jie Zhu   +6 more
doaj   +1 more source

Verification of the acoustic path mathematical model of the ultrasonic method for measuring distances to a heated vertical plate in conditions of natural convection

Известия высших учебных заведений. Поволжский регион:Технические науки, 2021
Background. This article describes a mathematical model of the acoustic path of the ultrasonic method for measuring distances to a heated vertical plate, developed in the geometrical-acoustics approximation.
A.V. Voronina, S.V. Pavlov
doaj   +1 more source

Fractional Wavelet Transform Using an Unbalanced Lifting Structure [PDF]

, 2011
In this article, we introduce the concept of fractional wavelet transform. Using a two-channel unbalanced lifting structure it is possible to decompose a given discrete-time signal x[n] sampled with period T into two sub-signals x1[n] and x2[n] whose ...
Y. H. Habiboğlu, Habiboglu, Y. Hakan, Cetin, A. Enis, A. E. Çetin, Kivanc Kose, Kose, Kivanc, Köse, Kıvanç   +6 more
core   +1 more source

Twin Crystal Moiré Metasurfaces for Crossing Flat‐Band Transport

Advanced Functional Materials, EarlyView.
This study introduces twin crystal moiré metasurfaces, breaking in‐plane symmetry to enable reconfigurable acoustic wave manipulation. By adjusting the twin angle and interlayer twist angle, various combinations of hyperbolic, flat bands, and elliptic states can be synthesized in the system.
Shida Fan, Chenglin Han, Kuan He, Chadi Ellouzi, Yunlong Wang, Li‐Qun Chen, Jie Sun, Zhaodong Xu, Chen Shen, Tianzhi Yang   +9 more
wiley   +1 more source

Comparison of Impulse Response Generation Methods for a Simple Shoebox-Shaped Room

Acoustics
Simulated room impulse responses (RIRs) are important tools for studying architectural acoustics. Many methods exist to generate RIRs, each with unique properties that need to be considered when choosing an RIR synthesis technique.
Lloyd May, Nima Farzaneh, Orchisama Das, Jonathan S. Abel   +3 more
doaj   +1 more source

Geometrization of the Leading Term in Acoustic Gaussian Beams

Journal of Nonlinear Mathematical Physics, 2021
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +1 more source

Applicability of multi-objective optimization in classroom acoustics design using analytical and geometrical acoustic models [PDF]

, 2020
The purpose of this study is to improve the acoustic quality of classrooms for a better teaching-learning process by the development of a routine which aids in the optimization of typology, extension and position of acoustic materials.
Lombardo, Angelo, Shtrepi, Louena, Astolfi, Arianna, Louena, Shtrepi   +3 more
core   +1 more source