Results 81 to 90 of about 129,142 (267)
Non-Riemannian geometry of turbulent acoustic flows and analog gravity [PDF]
arXiv, 2004 Non-Riemannian geometry of acoustic non-relativistic turbulent flows is irrotationally perturbed generating a acoustic geometry model with acoustic metric and acoustic Cartan contortion. The contortion term is due to nonlinearities in the turbulent fluid. The acoustic curvature and acoustic contortion are given by Dirac delta distributions.
arxiv
Buildings, 2014 For architects, real-time 3D visual rendering of CAD-models is a valuable tool. The architect usually perceives the visual appearance of the building interior in a natural and realistic way during the design process.
Sönke Pelzer +3 more
doaj +1 more source
Modelling Underwater Acoustic Propagation using One-way Wave Equations [PDF]
arXiv, 2022 The primary contribution of this paper is to characterize the propagation of acoustic signal carrying information through any medium and the interaction of the travelling acoustic signal with the surrounding medium. We will use the concept of damped harmonic oscillator to model the medium and Milne's oscillator technique to map the interaction of the ...
arxiv
Accessing the exceptional points of parity-time symmetric acoustics
Nature Communications, 2016 Parity-time (PT) symmetric systems experience phase transition between PT exact and broken phases at exceptional point. These PT phase transitions contribute significantly to the design of single mode lasers, coherent perfect absorbers, isolators, and ...
Chengzhi Shi +6 more
semanticscholar +1 more source
Flat acoustics with soft gradient-index metasurfaces
Nature Communications, 2019 Recently, metasurfaces have been proven to be effective and compact devices for the design of arbitrary wavefronts. Metasurfaces are planar metamaterials with a subwavelength thickness that allows wavefront shaping by introducing in-plane variations ...
Yabin Jin +4 more
semanticscholar +1 more source
Applied SciencesSparse Bayesian learning (SBL) is widely used for sound field reconstruction (SFR). Among various SBL approaches, pattern-coupled SBL has been demonstrated to achieve superior performance.
Simiao Chen +4 more
doaj +1 more source
Influence of Classroom Acoustics on Noise Disturbance and Well-Being for First Graders
Frontiers in Psychology, 2019 Several studies have shown so far that poor acoustics inside classrooms negatively affects the teaching and learning processes, especially at the lowest grades of education.
A. Astolfi +6 more
semanticscholar +1 more source
SensorsIn order to improve the detection range and imaging resolution of dipole remote detection logging, an optimal nonlinear frequency modulation (ONLFM) excitation method is proposed in this paper.
Xueshen Cao +5 more
doaj +1 more source
Acoustic pressure modulation driven by spatially non-uniform flow [PDF]
The recent identification of a modulation of acoustic waves that is driven by spatial velocity gradients, using acoustic black and white hole analogues [Schenke et al., J. Acoust. Soc. Am. 154 (2023), 781-791], has shed new light on the complex interplay of acoustic waves and non-uniform flows.
arxiv +1 more source
The Journal of the Acoustical Society of America, 1965 Nonlinear acoustics (NLA), within the framework of physical acoustics, has come of age over the past 30 years, yet new phenomena continue to be observed, so that the subject is not yet exhausted. The session will begin with a review of the mathematics of describing NLA (part 1).
openaire +2 more sources