{"id":187,"date":"2017-08-24T09:32:07","date_gmt":"2017-08-24T01:32:07","guid":{"rendered":"http:\/\/sheng.people.ust.hk\/?p=187"},"modified":"2017-09-13T00:30:47","modified_gmt":"2017-09-12T16:30:47","slug":"generic-wave-characteristics-in-heterogeneous-materials","status":"publish","type":"post","link":"http:\/\/sheng.people.ust.hk\/?p=187","title":{"rendered":"Generic wave characteristics in heterogeneous materials"},"content":{"rendered":"<ul>\n<li>Formulated a theoretical framework for the quantitative prediction of wave phenomena in the intermediate frequency regime. The theory resolves the classical problem concerning the definition and calculation of group velocity in a strongly scattering medium, and gives quantitative explanation of observed multiple acoustic modes in colloidal systems.<\/li>\n<\/ul>\n<p><!--more--><\/p>\n<figure id=\"attachment_188\" aria-describedby=\"caption-attachment-188\" style=\"width: 660px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" class=\"size-large wp-image-188\" src=\"http:\/\/sheng.people.ust.hk\/wp-content\/uploads\/2017\/08\/fig1-3-1024x772.jpg\" alt=\"\" width=\"660\" height=\"498\" srcset=\"http:\/\/sheng.people.ust.hk\/wp-content\/uploads\/2017\/08\/fig1-3-1024x772.jpg 1024w, http:\/\/sheng.people.ust.hk\/wp-content\/uploads\/2017\/08\/fig1-3-300x226.jpg 300w, http:\/\/sheng.people.ust.hk\/wp-content\/uploads\/2017\/08\/fig1-3-768x579.jpg 768w, http:\/\/sheng.people.ust.hk\/wp-content\/uploads\/2017\/08\/fig1-3.jpg 1898w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><figcaption id=\"caption-attachment-188\" class=\"wp-caption-text\">Magnitude of the spectral function plotted as a function of normalized frequency and wave vector<\/figcaption><\/figure>\n<p dir=\"ltr\"><strong>Key publications:<\/strong><\/p>\n<ol>\n<li>&#8220;<strong><a style=\"color: #1252ba\" href=\"http:\/\/sheng.people.ust.hk\/wp-content\/uploads\/2017\/08\/Theory-of-Acoustic-Excitations-in-Colloidal-Suspensions.pdf\">Theory of Acoustic Excitations in Colloidal Suspensions<\/a><\/strong>&#8220;, X. Jing, Ping Sheng and Minyao Zhou, <em>Phys. Rev. Lett.<\/em> 66, 1240 (1991).<\/li>\n<li>&#8220;<strong><a style=\"color: #1252ba\" href=\"http:\/\/sheng.people.ust.hk\/wp-content\/uploads\/2017\/08\/Acoustic-and-Electromagnetic-Quasimodes-in-Dispersed-Random-Media.pdf\">Acoustic and Electromagnetic Quasi-Modes in Dispersed Random Media<\/a><\/strong>&#8220;, X. Jing, Ping Sheng and M. Zhou, <em>Phys. Rev. A<\/em>46, 6513 (1992).<\/li>\n<li>&#8220;<strong><a style=\"color: #1252ba\" href=\"http:\/\/sheng.people.ust.hk\/wp-content\/uploads\/2017\/08\/Group-Velocity-in-Strongly-Scattering-Media.pdf\">Group Velocity in Strongly Scattering Media<\/a><\/strong>&#8220;, J. Page, Ping Sheng, H. Schriemer, I. Jones, X. Jing, and D. Weitz, <em>Science<\/em> 271, 634 (1996).<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ul>\n<li>Wave localization is usually characterized by exponential decay of the wave function in space.\u00a0\u00a0However, for pulse reflection from a random medium there can also be a signature of wave localization manifest statistically in the power spectrum of the reflected wave time series.\u00a0\u00a0This signifies a wave localization signature in the time domain.<\/li>\n<\/ul>\n<p><strong>Key publications:<\/strong><\/p>\n<ol>\n<li>&#8220;<strong><a style=\"color: #1252ba\" href=\"http:\/\/sheng.people.ust.hk\/wp-content\/uploads\/2017\/08\/Multiple-Scattering-Noise-in-One-Dimension-Universality-through-Localization-Length-Scaling.pdf\">Multiple-Scattering Noise in One Dimension: Universality through Localization-Length Scaling<\/a><\/strong>&#8220;, Ping Sheng, Z. Q. Zhang, B. White and G. Papanicolaou, <em>Phys. Rev. Lett.<\/em> 57, 1000 (1986).<\/li>\n<li>&#8220;<strong><a style=\"color: #1252ba\" href=\"http:\/\/sheng.people.ust.hk\/wp-content\/uploads\/2017\/08\/Wave-Localization-Characteristics-in-the-Time-Domain.pdf\">Wave Localization Characteristics in the Time Domain<\/a><\/strong>&#8220;, B. White, Ping Sheng, Z. Q. Zhang and G. Papanicolaou, <em>Phys. Rev. Lett.<\/em> 59, 1918 (1987).<\/li>\n<li>&#8220;<strong><a style=\"color: #1252ba\" href=\"http:\/\/sheng.people.ust.hk\/wp-content\/uploads\/2017\/08\/Wave-Localization-and-Multiple-Scattering-in-Randomly-Layered-Media.pdf\">Wave Localization and Multiple Scattering in Randomly-Layered Media<\/a><\/strong>&#8220;, Ping Sheng, B. White, Z. Q. Zhang, and G. Papanicolaou, in &#8220;Scattering and Localization of Classical Waves in Random Media&#8221;, edited by P. Sheng (World Scientific Publishing Co., Inc. Singapore, 1990), p. 563.<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ul>\n<li>Clarified the relationship between the generic phenomenon of heat conductivity plateau in disordered materials and phonon scattering, phonon localization, and the Ioffe-Regel criterion; the first to point out the criterion of critical index of refraction (or wave impedance) contrast for 3D classical wave localization.<\/li>\n<\/ul>\n<p><strong>Key publications:<\/strong><\/p>\n<ol>\n<li>&#8220;<strong><a style=\"color: #1252ba\" href=\"http:\/\/sheng.people.ust.hk\/wp-content\/uploads\/2017\/08\/Scalar-Wave-Localization-in-a-Two-Component-Composite.pdf\">Scalar-Wave Localization in a Two-Component Composite<\/a><\/strong>&#8220;, Ping Sheng and Zhao-Qing Zhang, <em>Phys. Rev. Lett.<\/em> 57, 1879 (1986).<\/li>\n<li>&#8220;<strong><a style=\"color: #1252ba\" href=\"http:\/\/sheng.people.ust.hk\/wp-content\/uploads\/2017\/08\/Heat-Conductivity-of-Amorphous-Solids-Simulation-Results-on-Model-Structures.pdf\">Heat Conductivity of Amorphous Solids: Simulation Results on Model Structures<\/a><\/strong>&#8220;, Ping Sheng and M. Y. Zhou, <em>Science<\/em> 253, 539 (1991).<\/li>\n<li>&#8220;<strong><a style=\"color: #1252ba\" href=\"http:\/\/sheng.people.ust.hk\/wp-content\/uploads\/2017\/08\/Phonon-Transport-in-Strong-Scattering-Media.pdf\">Phonon Transport in Strong-Scattering Media<\/a><\/strong>&#8220;, Ping Sheng, M. Zhou and Z. Q. Zhang, <em>Phys. Rev. Lett.<\/em> 72, 234 (1994).<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ul>\n<li>Patented a non-plane wave, focused-energy electromagnetic wave solution that can propagate indefinitely without distortion and invented a practical way for its approximate realization.<\/li>\n<\/ul>\n<p><strong>Key publication:<\/strong><\/p>\n<ol>\n<li>&#8220;Optical Playback System Having Increased Depth of Field&#8221;, U.S. Patent #4,179,708 Ping Sheng and A. H. Firester.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Formulated a theoretical framework for the quantitative prediction of wave phenomena in the intermediate frequency regime. The theory resolves the classical problem concerning the definition and calculation of group velocity in a strongly scattering medium, and gives quantitative explanation of observed multiple acoustic modes in colloidal systems.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[],"_links":{"self":[{"href":"http:\/\/sheng.people.ust.hk\/index.php?rest_route=\/wp\/v2\/posts\/187"}],"collection":[{"href":"http:\/\/sheng.people.ust.hk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/sheng.people.ust.hk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/sheng.people.ust.hk\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/sheng.people.ust.hk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=187"}],"version-history":[{"count":10,"href":"http:\/\/sheng.people.ust.hk\/index.php?rest_route=\/wp\/v2\/posts\/187\/revisions"}],"predecessor-version":[{"id":994,"href":"http:\/\/sheng.people.ust.hk\/index.php?rest_route=\/wp\/v2\/posts\/187\/revisions\/994"}],"wp:attachment":[{"href":"http:\/\/sheng.people.ust.hk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=187"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/sheng.people.ust.hk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=187"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/sheng.people.ust.hk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=187"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}