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 14 of 14 for “"Cavity model"”.
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A Coupled Tire Structure-Acoustic Cavity Model
… shown that the vibration induced by the tire air cavity resonance is transmitted into the vehicle cabin and may be responsible for significant interior noise. The tire acoustic cavity is excited by the road surface through the contact patch on the rotating tire. The effect of the cavity resonance …
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Development and applications of the cavity model and FDTD for power integrity and EMI problems
"This dissertation discusses four topics relevant to power integrity and EMC."--Abstract, page iv.
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Novel feeds for microstrip and slot antennas: Theory and experiment
… both experimentally and theoretically, using the cavity model as well as a full-wave analysis. The input impedance of a microstrip antenna fed by an arbitrarily oriented slot in the ground plane is computed using the cavity model theory. This study is extended to the calculation of the feed locus …
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An Improved dipole-moment model based on near-field scanning for characterizing near-field coupling and far-field radiation from an IC
… in wireless platform design. The accurate noise model of integrated circuits (ICs) is needed to help designers to diagnose and predict RFI problems. In this dissertation, an improved IC radiated emission model based on near-field measurements is proposed. The regularization technique and the …
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Estimation of GMRFs by recursive cavity modeling
… thesis develops the novel method of recursive cavity modeling as a tractable approach to approximate inference in large Gauss-Markov random fields. The main idea is to recursively dissect the field, constructing a cavity model for each subfield at each level of dissection. The cavity model …
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Cavity flow past an obstacle including gravity effects
… the relaxation method to find the solution of cavity flow past a two-dimensional roughness element in an open channel with gravity effect included. The method developed is based on an inviscid, irrotational and incompressible flowfield, using a finite-difference representation with stream …
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Numerical Study of Fully Developed Laminar and Turbulent Flow Through Microchannels with Longitudinal Microstructures
… structures, the liquid is unable to wet the cavity and a liquid meniscus is formed between ribs. This creates a liquid-vapor interface at the cavity regions and renders surfaces with alternating regions of no-slip and of reduced shear on the microscale. This thesis reports the numerical study …
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Surface-emitting lasers for communications: novel metal-cavity microlasers and high-contrast-grating tunable VCSELs
… optical confinement is discussed. Theoretical modeling of quantum-well and quantum-dot emission properties, as well as experimental characterization of their coupling with optical cavities, are presented. Lasing behavior of our designed and fabricated devices is demonstrated at room temperature …
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Bandwidth enhancement techniques for low-profile antennas: Theory and experiment
… use of coupled resonators. In particular, two cavity-backed slot antennas are coupled through an aperture in a common wall. One cavity-backed slot antenna, of the coupled antenna system, is driven. This coupled antenna system is analyzed using two different approaches. The first approach …
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Selective electro-magnetic absorbers based on metal-dielectric-metal thin-film cavities
… invented for radar absorption. A Fabry-Perot cavity model depending on the thickness of the dielectric, but also the effective permittivity of the semi-transparent top metal gives calculated spectra that agree well with experiment. Secondly, we fabricated long-wave IR and far-IR MDM absorbers …
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Computational Modelling and Experimental Verifcation of Quasioptical Components at Millimetre Wavelengths
… of the modes present in the resonant Fabry-Perot cavity. Detailed analysis was performed using CST, a full electromagnetic modelling package on resonant metallic cavities related to describing a waveguide coupled bolometer for the SAFARI instrument on the proposed SPICA space telescope mission. A …
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Ice shelf-ocean interactions in a general circulation model : melt-rate modulation due to mean flow and tidal currents
… speeds of marine ice sheets around Antarctica. Modeling these interactions requires parameterizing the turbulent boundary layer processes to infer melt rates from the oceanic state at the ice-ocean interface. Here we explore two such parameterizations in the context of the MIT ocean general …
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Ice shelf-ocean interactions in a general circulation model : melt-rate modulation due to mean flow and tidal currents
… speeds of marine ice sheets around Antarctica. Modeling these interactions requires parameterizing the turbulent boundary layer processes to infer melt rates from the oceanic state at the ice-ocean interface. Here we explore two such parameterizations in the context of the MIT ocean general …
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Configurable multi-port radiators
… configurable apertures based on an abstract modeling and representation of multi-port coupled antennas. As proof of concept, we design, fabricate, and measure an 11-port wire antenna based on the proposed approach. The prototype shows both frequency and beam reconfigurability and reasonably …