Results 31 to 40 of about 2,194,277 (301)

sound absorption coefficient [PDF]

, 2012
The accuracy of a method [Wijnant et al., “Development and applica- tion of a new method for the in-situ measurement of sound absorption”, ISMA 31, Leuven, Belgium (2010).], for measurement of the effective area-averaged in situ sound absorption ...
Wijnant, Ysbrand H., Kuipers, E.R., Erwin R. Kuipers, André de Boer, de Boer, A, Ysbrand H. Wijnant   +5 more
core   +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

Measurement of Wavelength-Resolved Light Absorption by Aerosols Utilizing a UV-VIS Extinction Cell [PDF]

, 2005
The principle, technical details, and performance of the long path extinction spectrometer (LOPES), a new folded-path extinction cell with a spectral range from the mid-UV (200 nm) to the near infrared (1015 nm), is presented.
Schurath, Ulrich, Klein, Karl-Friedrich, Thielmann, Axel, Schurath, U., Möhler, Ottmar, Schmid, O., Gimmler, M., Schmid, Otmar, Fritzsche, L., Andreae, M. O., Petzold, Andreas, Fritzsche, Lutz, Schnaiter, M., Mohler, O. M., Thielmann, A., Helas, Günther, Andreae, Meinrat O., Petzold, A., Helas, G., Schnaiter, Martin, Gimmler, Melanie, Linke, Claudia, Klein, K. F., Linke, C.   +23 more
core   +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

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

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

High absorption coefficient cyclopentadithiophene donor-free dyes for liquid and solid-state dye-sensitized solar cells [PDF]

, 2016
We report a series of "donor-free" dyes featuring moieties of oligo(4,4-dihexyl-4H-cyclopenta[1,2-b:5,4-b′]dithiophene) (CPDT) functionalized with cyanoacrylic end groups for mesoscopic titania solar cells based on I-/I3 - or Co(II)/Co(III) redox couple ...
Robertson, Neil, Cao, Yiming, Grätzel, Michael, Ivaturi, Aruna, Zakeeruddin, Shaik Mohammed, Hu, Yue, Abate, Antonio   +6 more
core   +2 more sources

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