{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/87722"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/87722","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Coupled Acoustic and Electromagnetic Disturbances in a Granular Material Saturated by a Fluid Electrolyte","abstract":"160 p.","abstract_html":"160 p.","abstract_has_math":false,"creators":["Block, Gareth Ian"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Theoretical and Applied Mechanics","degree_department":null,"school":null,"contributors":["Harris, John G."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-28T16:23:40Z","date_published":"2015-09-28T16:23:40Z","updated_at":"2026-07-22T22:26:30Z","subjects":["Physical Oceanography"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3153250"],"render_values":[{"text":"(MiAaPQ)AAI3153250","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/87722","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Harris, John G."]},{"key":"dc:creator","label":"Author","values":["Block, Gareth Ian"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-28T16:23:40Z","10000-01-01","2004"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Theoretical and Applied Mechanics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physical Oceanography"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/87722","(MiAaPQ)AAI3153250"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["160 p.","\"We devised two reciprocal experiments to study these phenomena. \"\"EK transmission\"\" occurs when an applied voltage creates an electro-acoustic wave; in practice, this leads to thermoelastic motion, as well as electrokinetics, so that we have had to account for both effects. Conversely, \"\"EK reception\"\" occurs when a pressure wave generates a measurable voltage in electrolyte-saturated sediments. The EK reception apparatus made use of a submerged, acoustic transducer to insonify a water-sediment interface with short, 50 kHz sine-wave bursts and chirped pulses from 10--800 kHz. The resulting wave motion was monitored using Ag/AgCl electrodes fixed in a vertical array above and below the sediment interface. We measured the conductivity dependence of two kinds of EK behavior: (1) voltages generated within the samples that were localized around the transmitted \"\"fast\"\" waves, and (2) electromagnetic (EM) waves produced at the water-sediment interface. Fast-wave voltages were often greater than 500 muV, while the EM-wave potentials were usually 100 muV in magnitude. A model of plane-wave reflection from a water-EK-Biot interface leads to theoretical predictions that compare very well to experimental data for sand and glass microspheres. Both EM- and fast-wave voltages are caused by relative fluid motion in the sediment, a feature that is characteristic of poroelastic media---but not predicted by either fluid or solid models.\"","Made available in DSpace on 2015-09-28T16:23:40Z (GMT). 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Conversely, \"\"EK reception\"\" occurs when a pressure wave generates a measurable voltage in electrolyte-saturated sediments. The EK reception apparatus made use of a submerged, acoustic transducer to insonify a water-sediment interface with short, 50 kHz sine-wave bursts and chirped pulses from 10--800 kHz. The resulting wave motion was monitored using Ag/AgCl electrodes fixed in a vertical array above and below the sediment interface. We measured the conductivity dependence of two kinds of EK behavior: (1) voltages generated within the samples that were localized around the transmitted \"\"fast\"\" waves, and (2) electromagnetic (EM) waves produced at the water-sediment interface. Fast-wave voltages were often greater than 500 muV, while the EM-wave potentials were usually 100 muV in magnitude. A model of plane-wave reflection from a water-EK-Biot interface leads to theoretical predictions that compare very well to experimental data for sand and glass microspheres. Both EM- and fast-wave voltages are caused by relative fluid motion in the sediment, a feature that is characteristic of poroelastic media---but not predicted by either fluid or solid models.\"","Made available in DSpace on 2015-09-28T16:23:40Z (GMT). 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