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标题：Anomalous Dispersion of the <svg style="vertical-align:-4.32007pt;width:19.0375px;" id="M1" height="20.450001" version="1.1" viewBox="0 0 19.0375 20.450001" width="19.0375" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"> <g transform="matrix(.022,-0,0,-.022,.062,15.012)"><path id="x1D446" d="M457 488l-30 -3q-17 148 -131 148q-53 0 -84.5 -34.5t-31.5 -82.5q0 -42 25.5 -72t74.5 -62l33 -22q63 -42 95 -85t32 -102q0 -84 -67 -137t-163 -53q-58 0 -113 22t-70 43l-4 152l27 4q4 -32 15 -62.5t31 -59.5t53.5 -47t76.5 -18q56 0 92 35t36 96q0 39 -25 70t-78 68
l-31 22q-32 23 -53.5 41.5t-45 57t-23.5 77.5q0 82 58 132.5t156 50.5q46 0 101 -17l18.5 -6t17 -6t8.5 -3q-4 -55 0 -147z" /></g> <g transform="matrix(.016,-0,0,-.016,10.825,20.388)"><path id="x31" d="M384 0h-275v27q67 5 81.5 18.5t14.5 68.5v385q0 38 -7.5 47.5t-40.5 10.5l-48 2v24q85 15 178 52v-521q0 -55 14.5 -68.5t82.5 -18.5v-27z" /></g> </svg> Lamb Mode
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作者：Faiz Ahmad ; Takasar Hussain
期刊名称：Advances in Acoustics and Vibration
印刷版ISSN：1687-6261
电子版ISSN：1687-627X
出版年度：2013
卷号：2013
DOI：10.1155/2013/903934
出版社：Hindawi Publishing Corporation
摘要：The mode of the Lamb spectrum of an isotropic plate exhibits negative group velocity in a narrow frequency domain. This anomalous behavior is explained analytically by examining the slope of each mode first in its initial state and then near its turning points.