Results 41 to 50 of about 45,161 (201)

The effect of using synthetic fibers on some properties of modified juss

MATEC Web of Conferences, 2018
This paper examines the mechanical properties of a composite material made of modified Iraqi gypsum (juss) reinforced with polypropylene fibers. The modified juss was prepared by adding two percentages of cement (5, 10) %.
Fawzi Nada Mahdi, Zghair Luma Abdul Ghani, Hamad Hind Hussein   +2 more
doaj   +1 more source

Noise Reduction in Tractor Cabs Using Coupled Resonance Acoustic Materials

IEEE Access, 2022
The noise level in a tractor cab directly affects the driving experience. Reducing the noise level in a tractor cab is an important means of improving the image of the product brand and protecting the physical and psychological health of employees.
Zhipeng Wang, Yanyan Zuo, Liming Sun, Xiaohe Zhao   +3 more
doaj   +1 more source

3D-printed multifunctional chiral metamaterial with invariant sound absorption under large deformation and low-frequency vibration control

Virtual and Physical Prototyping
Acoustic metamaterials provide a distinctive route for reducing low-frequency noise and vibration; however, most are characterised by their singular functionality, e.g. sound absorption or vibration suppression.
Jingjian Xu, Xiang Song, Boyang Zhao, Hanjie Yang, Dan Sui, Jie Zhou, Heye Xiao   +6 more
doaj   +1 more source

Prospective Evaluation of the Efficacy of Isolated Balloon Eustachian Tuboplasty: Short- and Medium-term Follow-up Results Based on Tubomanometry, ETDQ-7, Tympanometry, and Valsalva Maneuver

International Archives of Otorhinolaryngology
Introduction Balloon eustachian tuboplasty (BET) allows the treatment of the main etiology of eustachian tube disfunction (ETD).
Cátia Azevedo, Filipa Moreira, António Fontes Lima, Fernando Milhazes Mar, Sérgio Vilarinho, Luís Dias   +5 more
doaj   +1 more source

An Acoustic Impedance Model for Evaluating Ground Effect of Static-Firing Tests on Rocket Motors

JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 2010
Evaluation of ground effect is important for acoustic measurement in static-firing tests on rocket motors. The effectiveness of existing acoustic impedance models is examined by comparing with some experimental results. Through the comparison and evaluation of effect of meteorological condition, it is confirmed that the existing impedance models are ...
Kota FUKUDA, Seiji TSUTSUMI, Kyoichi UI, Tatsuya ISHII, Ryoji TAKAKI, Kozo FUJII   +5 more
openaire   +2 more sources

Accounting for convective effects in zero-Mach-number thermoacoustic models [PDF]

, 2014
This paper presents a methodology to account for some mean-flow effects on thermo-acoustic instabilities when using the zero-Mach-number assumption. It is shown that when a computational domain is represented under the M=0 assumption, a nonzero-Mach ...
Bloxsidge, Boij, Candel, Candel, Cantrell, Chu, Davies, DeGoey, Doak, Dowling, Dowling, Duran, Durrieu, E. Motheau, F. Nicoud, Ffowcs Williams, Goh, Gullaud, Hield, Howe, Huang, Karlsson, Kotake, L. Selle, Lamarque, Leyko, Lieuwen, Lighthill, Macquisten, Marble, Morfey, Morfey, Motheau, Motheau, Myers, Nicoud, Nicoud, Peters, Pitsch, Polifke, Polifke, Rao, Rayleigh, Sattelmayer, Schmitt, Selle, Wolf, Wolf, Yu   +48 more
core   +5 more sources

The high strain-rate behaviour of three molecular weights of polyethylene examined with a magnesium alloy split-Hopkinson pressure bar

, 2013
A traditional split-Hopkinson pressure bar system has been modified by the addition of ZK60A magnesium alloy pressure bars in order to increase the resolution of data when examining specimens of low-density, high-density and ultra-high molecular weight ...
Hughes, Foz, Prudom, Andrew, Swallowe, Gerry   +2 more
core   +1 more source

Viscosity measurement in thin lubricant films using shear ultrasonic reflection [PDF]

, 2008
When a shear ultrasonic wave is incident on a solid and liquid boundary, the proportion that is reflected depends on the liquid viscosity. This is the basis for some instruments for on-line measurement of bulk liquid viscosity.
Dwyer-Joyce R. S., Dwyer-Joyce R. S., Lian G.   +2 more
core   +1 more source

Meta-structure based on coupled resonators for low-frequency broadband sound absorption

Acta Scientiarum: Technology
This work investigates and explains the behavior of an acoustic meta-structure based on different coupled Helmholtz resonators (HR). The analytical formulation of the Maa model is used to represent both the acoustic impedance and the sound absorption ...
Lucas Adelmo Santos, Gildean do Nascimento Almeida, Erasmo Felipe Vergara, Leandro Rodrigues Barbosa, Linconl César Bastos Farias   +4 more
doaj   +1 more source

Validation of working of acoustic sensor for fission gas release characterization devoted to Jules Horowitz reactors in harsh condition up to 350°C and 120 bar [PDF]

EPJ Web of Conferences
For several years, the IES laboratory has been collaborating with the CEA to develop acoustic instrumentation for nuclear applications. As part of this collaboration, the IES acoustic team is designing a miniaturized sensor capable of measuring gas ...
Baudry F., Galeron G., Rosenkrantz E., Combette P., Bonzom P.V., Destouches C., Martin F., You D., Abadie R., Ferrandis J.Y.   +9 more
doaj   +1 more source