Biomass from Paddy Waste Fibers as Sustainable Acoustic Material

<table>Measured absorption coefficient of samples with the same thickness, <svg height="11.125" id="M20" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 44.5 11.125" width="44.5" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,10.862)"><path d="M324 430l-26 -36l-112 -4l-55 -265q-13 -66 7 -66q13 0 44.5 20t50.5 40l17 -24q-38 -40 -85.5 -73.5t-87.5 -33.5q-50 0 -21 138l55 262h-80l-2 8l25 34h66l25 99l78 63l10 -9l-37 -153h128z" id="x1D461"></path></g><g transform="matrix(.017,-0,0,-.017,10.568,10.862)"><path d="M535 323h-483v50h483v-50zM535 138h-483v50h483v-50z" id="x3D"></path></g><g transform="matrix(.017,-0,0,-.017,25.272,10.862)"><path d="M412 140l28 -9q0 -2 -35 -131h-373v23q112 112 161 170q59 70 92 127t33 115q0 63 -31 98t-86 35q-75 0 -137 -93l-22 20l57 81q55 59 135 59q69 0 118.5 -46.5t49.5 -122.5q0 -62 -29.5 -114t-102.5 -130l-141 -149h186q42 0 58.5 10.5t38.5 56.5z" id="x32"></path></g><g transform="matrix(.017,-0,0,-.017,33.431,10.862)"><path d="M241 635q53 0 94 -28.5t63.5 -76t33.5 -102.5t11 -116q0 -58 -11 -112.5t-34 -103.5t-63.5 -78.5t-94.5 -29.5t-95 28t-64.5 75t-34.5 102.5t-11 118.5q0 58 11.5 112.5t34.5 103t64.5 78t95.5 29.5zM238 602q-32 0 -55.5 -25t-35.5 -68t-17.5 -91t-5.5 -105
q0 -76 10 -138.5t37 -107.5t69 -45q32 0 55.5 25t35.5 68.5t17.5 91.5t5.5 105t-5.5 105.5t-18 92t-36 68t-56.5 24.5z" id="x30"></path></g>
</svg>mm: —<svg height="7.9625001" id="M21" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 8.0500002 7.9625001" width="8.0500002" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,7.9)"><path d="M439 255l-206 -206l-206 206l206 206zM368 255l-135 135l-135 -135l135 -135z" id="x22C4"></path></g>
</svg>— 2 grams and —<svg height="11.2625" id="M22" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 14.1625 11.2625" width="14.1625" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.2)"><path d="M799 12l-7 -12h-758l-7 12l381 643h10zM711 50l-298 503l-298 -503h596z" id="x25B3"></path></g>
</svg>— 4 grams.</table>

Advances in Acoustics and Vibration

Biomass from Paddy Waste Fibers as Sustainable Acoustic Material

Figure 6