Results 11 to 20 of about 253,865 (262)

Measurement of the diffuse field sound absorption using a sound field synthesis method

Acta Acustica, 2023
A method for measuring the diffuse field sound absorption coefficient of a material using sound field synthesis is proposed. A planar loudspeaker array is first used to generate acoustic plane waves with variable incidence angle on the surface of a ...
Dupont Samuel, Sanalatii Maryna, Melon Manuel, Robin Olivier, Berry Alain, Le Roux Jean-Christophe   +5 more
doaj   +1 more source

Fiber Weight Fraction Effect to Acoustic Properties of RHDPE Cantula Composite

Mekanika, 2017
In this study, composites made from recycled HDPE and Cantula fiber have been done and the absorption coefficient have been measured. Composites rHDPE-Cantula were made using hot press for approximately 60 minutes with 170oC temperature while pressure ...
Muhammad Taufik Burhany Hendrowarsito, Wijang Wisnu Raharjo, Dwi Aries Himawanto   +2 more
doaj   +1 more source

Concept study of sustainable noise control solution for HVAC systems based on microperforated elements [PDF]

Proceedings of the Estonian Academy of Sciences, 2021
Recently fibreless solutions have become a trend in the design of sustainable and environmentally friendly duct silencers. In this respect microperforated panels have been proved to provide adequate performance for the substitution of unfavourable ...
Margus Villau, Hans Rämmal, Jüri Lavrentjev   +2 more
doaj   +1 more source

Absorption-based algorithm for satellite estimating the particulate organic carbon concentration in the global surface ocean

Frontiers in Marine Science, 2023
Particulate organic carbon (POC) in the surface ocean contributes to understanding the global ocean carbon cycle system. The surface POC concentration can be effectively detected using satellites.
Qiang Li, Lingling Jiang, Yanlong Chen, Junwu Tang, Siwen Gao   +4 more
doaj   +1 more source

Acoustic Absorption Coefficient of Oil Palm Midrib Composite

Jurnal Fisika Flux
Composite from oil palm midrib waste is one of the natural fiber materials that can reduce noise. Its material sample composite with gypsum was placed inside an impedance tube, which fitted with the mass of palm midrib mill, i.e., 0.1 kg, 0.15 kg, and 0 ...
Defrianto Defrianto, Muhammad Ahlunnazah, Saktioto Saktioto, Nuraina Fika Lubis   +3 more
doaj   +1 more source

Ab Initio Study of Optical Properties of Hybrid Films Based on Bilayer Graphene and Single-Walled Carbon Nanotubes

C, 2023
In recent years, the possibility of combining graphene and carbon nanotubes has attracted much attention from researchers attempting to obtain new multifunctional hybrid materials with promising properties.
Michael M. Slepchenkov, Pavel V. Barkov, Dmitry A. Kolosov, Olga E. Glukhova   +3 more
doaj   +1 more source

THE ABSORPTION COEFFICIENTS OF URANIUM COMPOUNDS. [PDF]

Journal of the American Chemical Society, 1906
n ...
openaire   +2 more sources

Development of sound absorption coefficient prediction technique of ultrafine fiber

Nihon Kikai Gakkai ronbunshu, 2016
This report deals with sound absorption coefficient prediction technique of ultrafine fiber. As the sound absorption material used for the interior noise reduction of the automobile, the fiber with a diameter of several μm is considered.
Yoshio KUROSAWA
doaj   +1 more source

Optimization of Sound Absorption Performance of OGFC Asphalt Mixture Based onAcoustic Parameters [PDF]

Zhengzhou Daxue xuebao. Gongxue ban
In the phenomenological model, the sound absorption coefficient of porous materials was used to explaintakes into account the energy dissipation generated by the propagation of sound waves in the void structure.
WU Wenliang, LI Chenyue, DAI Shenglin
doaj   +1 more source

Effects of Applied Magnetic Field on the Optical Properties and Binding Energies Spherical GaAs Quantum Dot with Donor Impurity

Nanomaterials, 2022
The screened modified Kratzer potential (SMKP) model is utilized to scrutinize the impacts of an applied magnetic field (MF) on the binding energies and linear and nonlinear optical properties spherical GaAs quantum dot with donor impurity (DI).
Collins Okon Edet, Emre Bahadir Al, Fatih Ungan, Norshamsuri Ali, Nursalasawati Rusli, Syed Alwee Aljunid, Rosdisham Endut, Muhammad Asjad   +7 more
doaj   +1 more source