"6"^^ . . "Journal of Sound and Vibration" . "We present an experimental and theoretical analysis of the hot chocolate effect. The sound effect is evaluated using time-frequency signal processing, resulting in a quantitative visualization by spectrograms. This method allows us to capture the whole phenomenon, namely, to quantify the dynamics of the rising pitch. A general form of the time dependence volume fraction of the bubbles is proposed. We show that the effect occurs due to the nonlinear dependence of the speed of sound in the gas/liquid mixture on the volume fraction of the bubbles and the nonlinear time dependence of the volume fraction of the bubbles."@en . "hot chocolate effect; gas-liquid mixture; speed of sound"@en . . . "Visualization of the hot chocolate sound effect by spectrograms"@en . "We present an experimental and theoretical analysis of the hot chocolate effect. The sound effect is evaluated using time-frequency signal processing, resulting in a quantitative visualization by spectrograms. This method allows us to capture the whole phenomenon, namely, to quantify the dynamics of the rising pitch. A general form of the time dependence volume fraction of the bubbles is proposed. We show that the effect occurs due to the nonlinear dependence of the speed of sound in the gas/liquid mixture on the volume fraction of the bubbles and the nonlinear time dependence of the volume fraction of the bubbles." . "RIV/61388998:_____/12:00379958" . . "000309296500001" . "Fedorchenko, Alexander I." . "25" . . "P(GCP101/11/J019), P(IAA200760801), Z(AV0Z20760514)" . . "Visualization of the hot chocolate sound effect by spectrograms" . . . "4"^^ . "4"^^ . "Hrub\u00FD, Jan" . "Visualization of the hot chocolate sound effect by spectrograms" . . "Tr\u00E1vn\u00ED\u010Dek, Zden\u011Bk" . . "GB - Spojen\u00E9 kr\u00E1lovstv\u00ED Velk\u00E9 Brit\u00E1nie a Severn\u00EDho Irska" . "10.1016/j.jsv.2012.07.038" . . "Pavelka, Miroslav" . . . "[049C2567B47B]" . . . "177587" . . . . "331" . "Visualization of the hot chocolate sound effect by spectrograms"@en . "0022-460X" . . "RIV/61388998:_____/12:00379958!RIV13-AV0-61388998" . . . .