Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"bruggeman"”.
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Review of random media homogenization using effective medium theories
… nature of the medium. The Maxwell-Gamet and Bruggeman effective medium theories are widely used but their limitations are not always well understood. In this thesis, some of the more complex homogenization theories will only be partially derived or heuristically constructed in order to avoid …
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Microwave Impedance Microscopy Of Nanostructured Carbon
… the well-known effective medium approximation of Bruggeman is considered as a means of estimating the volume fractions of the constituents in inhomogeneous two-phase systems. Specifically, we consider the estimation of porosity in nanostructured carbons often used in charge storage devices, such …
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Characterization of gold black and its application in un-cooled infrared detectors
… medium theories such as Maxwell-Garnett, Bruggeman, Landau-Lifshitz-Looyenga and Bergman Formalism were utilized to calculate refractive index (n) and extinction coefficient (k). The aging induced changes on electrical and optical properties were studied in regular laboratory conditions …
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Characterization of Ferroelectric Films by Spectroscopic Ellipsometry
… models were developed by sequentially testing Bruggeman effective-media approximation (EMA) layers designed to simulate microstructural effects such as surface roughness, porosity, secondary phases, and substrate interaction. Cross-sectional analysis by atomic force microscopy (AFM), …
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Design guidelines and synthesis of a low dielectric constant inorganic composite for high performance microelectronic packaging
… a minimum loss in strength. A layered sphere Bruggeman effective-medium model was developed, which describes well, the expected dielectric constant of the composite. The model incorporates the aspect ratio of the microsphere and takes into account the dielectric constant of the hollow sphere …
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Single-molecule orientation estimation using a polarisation camera
This thesis presents the development of a new optical imaging method for measuring the orientation and position of single fluorescent molecules. The method - named POLCAM - is based on the use of a polarisation camera. Current methods for single-molecule orientation estimation require optical …
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One Step Ahead: The Police Transnational Firearms Intelligence Network (The 'Network').
… accompanied by their increasing use of firearms (Bruggeman 2008, Jojarth 2009 and Rollins 2010) and my epistemological standpoint (Corbin-Dwyer and Buckle 2009) relates to the development of policing and intelligence gathering on the firearms threat. Therefore, this professional doctorate thesis …
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Morphologic and Transcriptomic Response to Weed Pressure in Multiple Maize (Zea mays L.) Selections and Teosinte (Zea mays L. ssp parviglumis) Lines
<p>Sweet corn <em>(Zea mays</em> L. convar.<em> saccharata</em> var. <em>rugosa</em>) and modern dent variants (field maize, <em>Zea mays</em> L. <em>indentata</em>) have varying degrees of weed tolerance (ability to maintain yield under weed stress). Maize retains ~30% of its ancestral teosinte’s …
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Preferential movement of solutes through soils
Detection of unexpectedly high concentrations of agricultural pollutants in ground water have inspired investigations of the role of preferential movement of chemicals through agricultural soils. This research focuses on preferential flow and solute transport processes and the effects of …
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Growth and Characterisation of Spray Pyrolytic Doped Zinc and Aluminium Oxide Spectral-Selective thin Films
… of these thin films have been modeled using the Bruggeman and Maxwell-Garnett effective medium theories obtaining effective values for the permeability constants and using these to calculate the effective values of refractive indices. The film sheet resistance values of 0.75 , 9.5 and …
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Growth and Characterisation of Spray Pyrolytic Doped Zinc and Aluminium Oxide Spectral-Selective thin Films
… of these thin films have been modeled using the Bruggeman and Maxwell-Garnett effective medium theories obtaining effective values for the permeability constants and using these to calculate the effective values of refractive indices. The film sheet resistance values of 0.75 , 9.5 and …
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Computational fluid dynamics modelling of PEM fuel cells to investigate transport limitations.
… at high current density of 1.0 Acm-2. Bruggeman correlation was used in most of previous modelling work for explaining the diffusion of species though porous GDL and CL, but this thesis considered other types of effective diffusion models and investigated the effect of diffusion models …