Impossible BM oscillation? ("reinifrosch@xxxxxxxx" )


Subject: Impossible BM oscillation?
From:    "reinifrosch@xxxxxxxx"  <reinifrosch@xxxxxxxx>
Date:    Mon, 2 May 2011 16:07:22 +0000
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

------=_Part_3634_25193377.1304352442948 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Dear colleagues, I have submitted to the upcoming Forum Acusticum 2011 in Aalborg (June 27-J= uly 1) a contribution "Cochlear evanescent liquid sound-pressure waves near= localized oscillations of the basilar membrane". I derived the correspondi= ng liquid-sound pressure function above and below the BM (in a cochlear box= model) by superposition of the evanescent liquid sound-pressure waves gene= rated by three miniaturized tuning-fork prongs; that sound-pressure functio= n fulfils the Laplace equation. The corresponding (standing) BM oscillation= has a central antinode and two adjacent shallower antinodes. Today I (fina= lly) calculated the BM stiffness function S(x) which agrees with that oscil= lation. The stiffness at the central antinode is plausible: S =3D 1.7* S_re= s, where S_res =3D M * omega^2; M =3D BM surface mass density =3D 0.1 kg/m^= 2; f =3D 1 kHz. At distance-from-base x different from x_peak, however, the= resulting BM stiffness differs strongly from the just mentioned value. Now= I fear that "my" localized BM oscillation may be impossible. I plan to ret= ire the mentioned Forum-Acusticum contribution; but before doing so, I woul= d like to ask whether list members are willing to look at my manuscript and= at the excel file of the mentioned new calculation, and to send me comment= s. With many thanks and best wishes, Reinhart. =20 =20 Reinhart Frosch, Dr. phil. nat., CH-5200 Brugg. reinifrosch@xxxxxxxx . ------=_Part_3634_25193377.1304352442948 Content-Type: text/html;charset="UTF-8" Content-Transfer-Encoding: quoted-printable <html><head><style type=3D'text/css'> <!-- div.bwmail { background-color:#ffffff; font-family: Trebuchet MS,Arial,Helv= etica, sans-serif; font-size: small; margin:0; padding:0;} div.bwmail p { margin:0; padding:0; } div.bwmail table { font-family: Trebuchet MS,Arial,Helvetica, sans-serif; f= ont-size: small; } div.bwmail li { margin:0; padding:0; } --> </style> </head><body><div class=3D'bwmail'><P><FONT size=3D2>Dear colleagues,<BR>I = have submitted to the upcoming Forum Acusticum 2011 in Aalborg (June 27-Jul= y 1) a contribution "Cochlear evanescent liquid sound-pressure waves near l= ocalized oscillations of the basilar membrane". I derived the corresponding= liquid-sound pressure function above and below the BM (in a cochlear box m= odel) by superposition of the evanescent liquid sound-pressure waves genera= ted by three miniaturized tuning-fork prongs; that sound-pressure function = fulfils the Laplace equation. The corresponding (standing) BM oscillation h= as a central antinode and two adjacent shallower antinodes. Today I (finall= y) calculated the BM stiffness function S(x) which agrees with that oscilla= tion. The stiffness at the central antinode is plausible: S =3D 1.7* S_res,= where S_res =3D M * omega^2; M =3D BM surface mass density =3D 0.1 kg/m^2;= f =3D 1 kHz. At distance-from-base x different from x_peak, however, the r= esulting BM stiffness differs strongly from the just mentioned value. Now I= fear that "my" localized BM oscillation&nbsp;may be impossible. I plan to = retire the mentioned Forum-Acusticum contribution; but before doing so, I w= ould like to ask whether list members are willing to look at my manuscript = and at the excel file of the mentioned new calculation, and to send me comm= ents.<BR>With many thanks and best wishes,<BR>Reinhart.&nbsp; </FONT></P> <P><FONT size=3D2></FONT>&nbsp;</P> <P><FONT size=3D2>Reinhart Frosch,<BR>Dr. phil. nat.,<BR>CH-5200 Brugg.<BR>= reinifrosch@xxxxxxxx . </FONT></P></div></body></html> ------=_Part_3634_25193377.1304352442948--


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