Search results for "Perforated plates"

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Acoustic properties of plates with unevenly distributed macro perforations backed by woven meshes

2012

A hybrid model describing the acoustic properties of plates with macro-perforations that can be unevenly distributed on the plate surface and backed by woven or precision woven meshes with microscopic perforations is proposed. The plate perforations may be of circular or rectangular shapes. Since the perforated plate may not necessarily be considered as an equivalent fluid, its surface impedance is calculated by the Maa model [Noise Control Eng. J. 29, 77-84 (1987)], whereas the Johnson-Champoux-Allard model [J. Appl. Phys. 70, 1975-1979 (1991)] is used for the mesh. It is observed that the absorption of the carrying plate seems to depend on the hydraulic diameter of the perforations and no…

[SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph][SPI.ACOU] Engineering Sciences [physics]/Acoustics [physics.class-ph][ SPI.ACOU ] Engineering Sciences [physics]/Acoustics [physics.class-ph]Physics::Instrumentation and Detectorssound absorptionelementary cell modeleffective resistivitywoven meshesPerforated plates4355Ev Sound absorption properties of materials: theory and measurement of sound absorption coeffi 4350Gf Noise control at source: redesign application of absorptive materials and reactive element 4320Hq Velocity and attenuation of acoustic waves[PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]Physics::Fluid Dynamics[PHYS.MECA.ACOU] Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph][ PHYS.MECA.ACOU ] Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
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Iron Age craftworks in the southeast of the Iberian Peninsula. An approach based in Cultural Inheritance Theory

2021

Este trabajo tiene por objeto realizar una aproximación a las artesanías sobre materias duras de origen animal durante la Edad del Hierro en la PI y al estudio de los materiales como un medio para acercarnos a la sociedad que los produjo.  La problemática abordada contempla los procesos de la producción artesanal, la transmisión del conocimiento y la circulación de algunos de estos bienes. Hemos elegido dos tipos de piezas singulares: los peines de marfil y las placas de telar de hueso. Consideramos que este tipo de producciones constituye un fenómeno complejo y conforma una práctica cultural que recrea con códigos propios los gustos y la demanda de la época. A nivel metodológico, la Théori…

perforated platesArcheologyUNESCO::HISTORIAArt ibèriccraftspeopleIberian culturecultura ibéricaartesanostransmission of cultural knowledgeArchaeologyplacas perforadasCAnthropologyAuxiliary sciences of historyivory combspeines de marfil:HISTORIA [UNESCO]transmisión cultural del conocimientoiberian cultureCC1-960Munibe Antropologia-Arkeologia
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