Results 21 to 30 of about 9,903 (254)
Data-driven acoustic impedance inversion with reweighted L1 norm sparsity constraint
Frontiers in Earth Science, 2023 Acoustic impedance (AI) inversion is widely used in geophysics and reservoir prediction. But the traditional impedance inversion method cannot fully exploit the sparse characteristics of geological attributes. There are problems with multiplicity and low
Lian Zhao +7 more
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Medidas de reflectância acústica na otosclerose: estudo de caso
Audiology: Communication Research, 2014 O objetivo deste trabalho foi analisar as medidas de reflectância em uma paciente com otosclerose. A paciente, do gênero feminino, 51 anos, apresentava queixa de hipoacusia bilateral e a hipótese diagnóstica de otosclerose.
Letícia Cortez Neto +3 more
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Effect of Plastic Fibers on Properties of Foamed Concrete [PDF]
Engineering and Technology Journal, 2013 The main objective of this work is to study the effect of adding plastic fibers on Lightweight Aggregate Foamed Concrete (LWAFC) using mix proportion of 1:2.6:0.4 by volume (cement: fine Porcelanite: coarse Porcelanite) with 2% foaming agent by weight of
Hisham K. Ahmed +2 more
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Real ear unaided gain and its relation with the equivalent volume of the external and middle ear
International Archives of Otorhinolaryngology, 2012 Introduction: Old age is associated with changes in the characteristics of the middle ear transmission system and in external ear resonance, and these carry implications for the hearing aid (HA) verification process for which targets and measures of the ...
Bastos, Bárbara Guimarães +2 more
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Acoustic transmission loss in Hilbert fractal metamaterials
Scientific Reports, 2023 Acoustic metamaterials are increasingly being considered as a viable technology for sound insulation. Fractal patterns constitute a potentially groundbreaking architecture for acoustic metamaterials.
Gianni Comandini +3 more
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Micromachines, 2022 The study of impedance matching between a transducer and its working medium is an important part of acoustic transducer design. The traditional quarter wavelength matching (Q-matching) scheme is not suitable for broadband capacitive micromachined ...
Bizhen Gao +9 more
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Mechanical and Acoustic properties of Bagasse – Coconut Coir based Hybrid Reinforced Composites
Journal of Natural Fibers, 2022 In this paper, a hybrid composite is developed from natural fibers of bagasse and coconut coir. The mechanical and acoustic properties of the hybrid composites are investigated.
M.K. Marichelvam +2 more
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Advanced Engineering Materials, EarlyView.This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal +2 more
wiley +1 more source
THE EFFECT OF COARSE AGGREGATE RATIO ON THE PROPERTIES OF NO FINE LIGHT WEIGHT CONCRETE
Journal of Engineering, 2009 The main object of this work is to study the effect of coarse aggregate/cement ratio (A/C) on the property of no fine concrete. In this work, three ratio of A/C were used (6, 9 and 12 by weight).The cement content is maintained constant (125kg/m3) while
Hind.H. HAMAD +1 more
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Karl Popper and the Mechanisms of Hydrogen Embrittlement
Advanced Engineering Materials, EarlyView.Representation of the beginning of loss of ductility rather than embrittlement. Small concentrations of hydrogen in a diffusible form within iron are well‐established to harm the mechanical integrity of steels. There are theories that attempt to explain the pernicious role of hydrogen.
H. K. D. H. Bhadeshia
wiley +1 more source