Results 51 to 60 of about 45,161 (201)
Experimental validation of a two-dimensional shear-flow model for determining acoustic impedance [PDF]
Tests were conducted to validate a two-dimensional shear-flow analytical model for determining the acoustic impedance of a liner test specimen in a grazing-incidence, grazing-flow environment.
Jones, Michael G. +2 more
core +1 more source
Turbofan noise generation and suppression in aircraft engines are reviewed. The chain of physical processes which connect unsteady flow interactions with fan blades to far field noise is addressed.
Groeneweg, J. F., Rice, E. J.
core +1 more source
Journal of Marine Science and EngineeringWith the rapid advancement of underwater communication and unmanned aerial vehicle (UAV) technologies, the potential applications of cross-medium communication in environmental monitoring, maritime Internet of Things (IoTs), and rescue operations, in ...
Shaojian Yang +6 more
doaj +1 more source
TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 2011 The accurate evaluation of the ground reflection effect is of importance for acoustic measurement conducted during static-firing tests of rocket motors. The effectiveness of existing acoustic impedance models was examined by comparing experimental data collected from acoustically hard surfaces. Through these comparisons and the subsequent evaluation of
Kota FUKUDA +5 more
openaire +2 more sources
Application of Cellulose and Paper-Based Products in Building Acoustics
Archives of AcousticsThis article presents a comprehensive acoustic study of paper-based building products: cellulose wool,paperboard, corrugated cardboard, and honeycomb panels. The material configurations included the intact form as well as the various modifications, i.e.,
Aleksandra KLIMEK +3 more
doaj +1 more source
Experimental and mathematical survey of sound absorption performance of date palm fibers
Heliyon, 2019 The present study examines the acoustic behavior sample composites made of date palm natural fibers and polyvinyl alcohol. It also provides the comparison between the sound absorption coefficients obtained from the experimental tests and the ones ...
Ebrahim Taban +4 more
doaj +1 more source
New absorbent material acoustic based on kenaf’s fibre
Materiales de Construccion, 2010 Acoustic Standards in the building are responsible for, companies and individuals, propose new acoustic materials for the sound isolation. This paper presents a new sound-absorbent material, it is based on natural fibres, particularly fibres of kenaf. It
J. Ramis +4 more
doaj +1 more source
Advances in test and measurement of the interface adhesion and bond strengths in coating-substrate systems, emphasising blister and bulk techniques [PDF]
, 2019 In this paper, recent advances in the minimum-destructive testing of the adhesion of coating-substrate systems are reviewed, focusing on key techniques such as micro- and nano-scale levels of indentation, scratching, laser-induced wave shock, as well as ...
Chen, X. +3 more
core +2 more sources
Applied SciencesThe seismic image produced by pre-stack depth migration is more accurate and has clearer geological significance than the time image. However, the waveform of the depth-domain seismic image is affected not only by depth-dependent velocity variation but ...
Chengyu Sun, Ruiqian Cai, Zhen’an Yao
doaj +1 more source
European Radiology Experimental, 2020 Background To examine in vitro acoustic property of nonalcoholic fatty disease in mouse and human liver to identify nonalcoholic steatohepatitis (NASH). Methods The acoustic impedance (× 106 kg/m2/s) was measured in 35 free fatty acids (FFAs, 500 mmol/L)
Hitoshi Maruyama +8 more
doaj +1 more source