Sound absorption based on ocean measurements. Part II: Boric acid contribution and equation for total absorption

1982 ◽  
Vol 72 (6) ◽  
pp. 1879-1890 ◽  
Author(s):  
R. E. Francois ◽  
G. R. Garrison
Keyword(s):  
Boric Acid ◽  
Sound Absorption ◽  
Total Absorption ◽  
Ocean Measurements

scholarly journals SOUND ABSORPTION CALCULATION IMPEDANCE METHOD FOR RESONATOR CEILING/IMPEDANSINIS REZONANSINIŲ KABAMŲJŲ LUBŲ GARSO ABSORBCIJOS SKAIČIAYTMO METODAS

1996 ◽  
Vol 2 (5) ◽  
pp. 92-100 ◽  
Author(s):  
V. Stauskis
Keyword(s):  
Theoretical Model ◽  
Computer Program ◽  
Sound Absorption ◽  
Plane Surface ◽  
Impedance Method ◽  
Acoustic Absorption ◽  
Total Absorption ◽  
Absorption Effect ◽  
Calculation Results

The theoretical model of the suspended ceiling interspaced between the plane surfaces along and across the hall is analysed. The impedance method is used. A computer program has been developed to calculate, using the obtained formula, the sound absorption factors of the suspended interairspaced ceiling for the reading hall, the total absorption of this hall and the time of reverberation with varying width of the airspaces and their distance from the stiff plane surface. The obtained calculation results show the significant increase of the total hall absorption for the falling down wavre frequency. For a suitably selected width, number and distance from the stiff plane surface of the airspaces, it is possible to get the same acoustic absorption effect as for the special sound absorbing structures.

Boric Acid

1889 ◽  
Vol 27 (690supp) ◽  
pp. 11021-11021
Keyword(s):  
Boric Acid

PENGAWETAN ROTAN KURANG DIKENAL SEBAGAI BAHAN BAKU MEBEL MENGGUNAKAN RENDAMAN DINGIN

2012 ◽  
Vol 4 (2) ◽  
pp. 11
Author(s):  
Saibatul Hamdi
Keyword(s):  
Boric Acid ◽  
Central Kalimantan

This research used the lesser known species as much 5 types rattan, consisted of i.e marau (Calamus Mettanensis Becc), toho (Calamus Spp), galang (Daemonorops Verticilaris Griff Mart), hijau (Calamus Spp) and simpurut (Calamus Panajuga Becc) from Central Kalimantan. Preservative used the mixture of boric acid with the borax and copper-8 by  the concentration of 1,0 %, 2,0 % and 3,0 %. Soaked time during 2 day, 4 day and 6 day by immersion chilled. Result of research indicated that the retention value varied, the greater of concentration condensation and soaking period, the greater average the value of retention while penetration result at all of treatment showed the value 100 %.Keywords:  rattan, preservation, retention, penetration, cold soaking.

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