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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 7 of 7 (0.072 seconds)Spelling suggestions: "subject:"< i> inn site< /i> "" "subject:"< i> iin site< /i> ""
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<i>In situ</i> measurement of the coefficient of molecular diffusion in fine-grained tillReifferscheid, Laura Jean 31 July 2007
Diffusion dominated systems, including naturally occurring aquitards and engineered barrier systems, are important components for long-term waste containment. Diffusive transport can be quantified using the effective coefficient of diffusion (De) and the effective porosity (ne). These are empirical parameters that are commonly measured in a laboratory setting. The purpose of this research was to develop a field-based technique to perform <i>in situ</i> measurement of diffusive transport rates. Results from this measurement technique were evaluated by comparison with the results of conventional laboratory testing and back-analysis of a previously determined large-scale field diffusion profile.<p>
<i>In situ</i> diffusion testing was performed on two wells completed in diffusion-dominated zone of a till aquitard. Laboratory diffusion cell tests were conducted on core samples obtained from the screened zones of the diffusion wells. Diffusion testing was completed using conservative isotopes of water as tracers.<p>A finite element model was used to back-analyze results of laboratory and field experiments to determine the De values that best describe each system. Comparison of the field results with the laboratory results obtained from this study as well as previous studies indicate the field system is a useful method for measurement of De.<p>Back-analysis of a previously determined large-scale field deuterium profile for this aquitard showed very precise measurement of De is not required for estimation of contaminant transport in thick till aquitard systems. More accurate measurement may be more useful for barrier systems such as clay liners or slurry walls, where the characteristics of the diffusion-dominated zone are easier to define and the transport path is shorter relative to the transport time.
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<i>In situ</i> measurement of the coefficient of molecular diffusion in fine-grained tillReifferscheid, Laura Jean 31 July 2007 (has links)
Diffusion dominated systems, including naturally occurring aquitards and engineered barrier systems, are important components for long-term waste containment. Diffusive transport can be quantified using the effective coefficient of diffusion (De) and the effective porosity (ne). These are empirical parameters that are commonly measured in a laboratory setting. The purpose of this research was to develop a field-based technique to perform <i>in situ</i> measurement of diffusive transport rates. Results from this measurement technique were evaluated by comparison with the results of conventional laboratory testing and back-analysis of a previously determined large-scale field diffusion profile.<p>
<i>In situ</i> diffusion testing was performed on two wells completed in diffusion-dominated zone of a till aquitard. Laboratory diffusion cell tests were conducted on core samples obtained from the screened zones of the diffusion wells. Diffusion testing was completed using conservative isotopes of water as tracers.<p>A finite element model was used to back-analyze results of laboratory and field experiments to determine the De values that best describe each system. Comparison of the field results with the laboratory results obtained from this study as well as previous studies indicate the field system is a useful method for measurement of De.<p>Back-analysis of a previously determined large-scale field deuterium profile for this aquitard showed very precise measurement of De is not required for estimation of contaminant transport in thick till aquitard systems. More accurate measurement may be more useful for barrier systems such as clay liners or slurry walls, where the characteristics of the diffusion-dominated zone are easier to define and the transport path is shorter relative to the transport time.
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<i>In Situ</i> Studies of Sensor Film Dynamics by Spectroscopic EllipsometryZudans, Imants 02 September 2003 (has links)
No description available.
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<i>IN SITU</i> PREPARATION AND STRUCTURE - PROPERTY STUDIES OF FILLER PARTICLES IN POLY(DIMETHYLSILOXANE) ELASTOMERSMURUGESAN, SURESH 04 September 2003 (has links)
No description available.
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Purification and crystallization of spliceosomal snRNPs / Reinigung und Kristallisation von spleißosomalen snRNPsWeber, Gert 01 July 2008 (has links)
No description available.
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Characterization of olfactory receptor gene expression in the olfactory epithelium of larval Xenopus laevis / Charakterisierung der Expression von olfaktorischen Rezeptoren im olfaktorischen Epithel vom larvalen Xenopus laevisGliem, Sebastian 25 October 2010 (has links)
No description available.
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Rural Homegardens in Central Sulawesi, Indonesia: An Example for a Sustainable Agro-Ecosystem? / Ländliche Hausgärten in Zentral-Sulawesi, Indonesien: Ein Beispiel für ein nachhaltiges Agrar-Ökosystem?Kehlenbeck, Katja 15 May 2007 (has links)
No description available.
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