Acoustic properties of unconsolidated granular mixes

Voronina, Victoria; Horoshenkov, Kirill V.

doi:10.1016/j.apacoust.2003.12.002

Cited by 25 publications

(17 citation statements)

References 11 publications

(35 reference statements)

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“…Assuming that diffusion coefficient (distance/time) is 0.00025 m 2 s -1 , the oxygen diffusion coefficient is 0.00197 m 2 s -1 (Bird et al, 1960), and the porosity is 0.258, then the tortuosity is calculated to be 2.03. This compares favorably with estimates of tortuosity in other volcanic glasses that range from 1.47 (perlite) to 1.63 (vermiculite) (Voronina and Horoshenkov, 2004), which shows that the rock is certainly permeable. When the experiment was repeated in water, the rate of equilibration depended on the rate of stirring in the water bath (achieved by using a magnetic stirrer) and, hence, the rate of flow in and out of the pore spaces.…”

Section: Sensing Microbial Habitats In Volcanic Glassmentioning

confidence: 58%

The Microbial Habitability of Weathered Volcanic Glass Inferred from Continuous Sensing Techniques

Bagshaw

Cockell²,

Magan

et al. 2011

Astrobiology

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Basaltic glasses (hyaloclastite) are a widespread habitat for life in volcanic environments, yet their interior physical conditions are poorly characterized. We investigated the characteristics of exposed weathered basaltic glass from a surface outcrop in Iceland, using microprobes capable of continuous sensing, to determine whether the physical conditions in the rock interior are hospitable to microbial life. The material provided thermal protection from freeze-thaw and rapid temperature fluctuations, similar to data reported for other rock types. Water activity experiments showed that at moisture contents less than 13% wet weight, the glass and its weathering product, palagonite, had a water activity below levels suitable for bacterial growth. In pore spaces, however, these higher moisture conditions might be maintained for many days after a precipitation event. Gas exchange between the rock interior and exterior was rapid (< 10 min) when the rocks were dry, but when saturated with water, equilibration took many hours. During this period, we demonstrated the potential for low oxygen conditions within the rock caused by respiratory stimulation of the heterotrophic community within. These conditions might exist within subglacial environments during the formation of the rocks or in micro-environments in the interior of exposed rocks. The experiments showed that microbial communities at the site studied here could potentially be active for 39% of the year, if the depth of the community within the outcrop maintains a balance between access to liquid water and adequate protection from freezing. In the absence of precipitation, the interior of weathered basaltic glass is an extreme and life-limiting environment for microorganisms on Earth and other planets.

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Section: Sensing Microbial Habitats In Volcanic Glassmentioning

confidence: 58%

The Microbial Habitability of Weathered Volcanic Glass Inferred from Continuous Sensing Techniques

Bagshaw

Cockell²,

Magan

et al. 2011

Astrobiology

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“…However, sound absorption coefficients increased in high frequency range since there were numerous fine interspaces and reflectors formed inside sand particles in the perforations and cavities. The interspaces and reflectors generated sound absorption [18] similar to porous materials in high frequency range.…”

Section: Interfering Resultsmentioning

confidence: 99%

Characterization of a novel sound absorption material derived from waste agricultural film

Wang

Zhang

2017

Construction and Building Materials

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“…Absorption models are of the empirical, phenomenological or microstructural types. Voronina and Horoshenkov [8] proposed an empirical absorption model that depends on four non-acoustical parameters (porosity, tortuosity, specific density of the grain base, and characteristic dimension of particles), and have been applied to loose granular materials. Currently, however, more sophisticated M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 5 phenomenological and microstructural models have been proposed [9].…”

Section: Introductionmentioning

confidence: 99%

Inverse estimation of the non-acoustical parameters of loose granular absorbers by Simulated Annealing

Cobo

Moraes²,

Simón

2015

Building and Environment

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Acoustic properties of unconsolidated granular mixes

Cited by 25 publications

References 11 publications

The Microbial Habitability of Weathered Volcanic Glass Inferred from Continuous Sensing Techniques

The Microbial Habitability of Weathered Volcanic Glass Inferred from Continuous Sensing Techniques

Characterization of a novel sound absorption material derived from waste agricultural film

Inverse estimation of the non-acoustical parameters of loose granular absorbers by Simulated Annealing

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