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 20 of 37 for “"1D Model"”.
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Vertical Structure And Surface Interactions Of Nitrous Acid Using A 1D Model
… and vertical Transport in One Dimension (PACT-1D) model. This work builds on a previous 0D modelling study from the NACHTT campaign, where the greatest unknown source rate of HONO was found during the early morning when a morning burst of HONO were observed and a stable nocturnal boundary layer …
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Multinozzle printheads for 3D printing of viscoelastic inks
… of 3D printed structures. An iterative 1D model was developed that predicts the relative volumetric flow rates of power-law fluids in individual channels of a microfluidic network. The model utilized a modified Hagen-Poiseuille equation and the hydraulic-electric analogy. The model was …
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Spectral properties of planar helium under periodic driving
… confirmation of earlier calculations on a 1D model atom, though with important enhancements of the decay rate of these atomic eigenstates in the field, due to the transverse decay channel. The latter is already found to enhance the decay rates of the unperturbed frozen planet as compared to …
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Mathematical models for bistable nematic liquid crystal displays
… needed. This dissertation focuses on theoretical models of a possible bistable nematic device, whose operating principle relies on controlling surface anchoring conditions. Switching between the two stable steady states is achieved by application of a transient electric field. A 1D model is …
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The impact of environment on the evolution of protoplanetary discs
… protoplanetary discs is well described by simple 1D wave equations, by testing such 1D model with 3D SPH simulations. I also apply the 1D model to transition discs, and show that a massive planet orbiting within the central cavity can be inferred by a small warp in the outer disc, which can be …
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Návrh výfukového potrubí zážehového motoru Nissan SR20DE
… výkonovej charakteristike validovaný referenčný 1D model motora. Na tomto základe boli navrhnuté, iteračne optimalizované a vzájomne porovnané dve konštrukčné koncepcie zberného potrubia – usporiadanie typu 4-1 a 4-2-1. Výsledky simulácií preukázali, že obe navrhnuté koncepcie s prehľadom …
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MRI Studies of Gas Hydrodynamics in Automotive Particulate Filters
… velocity. This provides data for comparison with 1D and 3D CFD models at a range of flow rates. The 3D CFD model is validated for modest Reynolds numbers and allowed parameters such as flow profile shape and wall friction to be explored. The 1D model shows agreement with the measured data when …
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Nitrogen cycling in oxygen deficient zones : insights from δ15N and δ18O of nitrite and nitrate
… in the Costa Rica Upwelling Dome using a simple 1D model. Overall, this thesis describes new nitrogen and oxygen isotopic tracers and uses them to elucidate the complicated nitrogen biogeochemistry in oxygen deficient zones.
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A biomass-fueled combined steam and sCO2 heat and power cycle for Southern African conditions
… African bagasse fuel. A quasi-steady state 1D thermofluid network-based process model of the sCO2, steam and flue gas cycles was developed for nominal and partial load analysis. It accounts for the detailed component characteristics for the Rankine and Brayton cycles, as well as the biomass …
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One Dimensional Approach to Modeling Damage Evolution in Galvanic Corrosion
A one-dimensional mathematical model is developed to describe damage evolution in galvanic corrosion for a variety of geometries. An asymptotic procedure taking advantage of disparity in length scales is used to derive the model. The focus of this thesis is to detail the formulation and solution of …
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Numerical and analytical modelling of battery thermal management using passive cooling systems
… the battery thermal management systems (BTMS) modelling of Li-ions batteries and investigates the design and modelling of different passive cooling management solutions from single battery to module level. A simplified one-dimensional transient computational model of a prismatic lithium-ion …
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Design of wind turbines with Ultra-High Performance Concrete
… Then, the comparison with a similar steel model demonstrates that UHPC is both an economical and sustainable design solution for towers. This work is based on a combination of the UHPC 1D model developed at MIT and the interim recommendations provided by Association Franqaise de Genie …
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Nonlinear ion transport at high electric currents in shock electrodialysis and ion-intercalation memories
… contribution of this thesis to shock ED is the modeling of multicomponent ion separation. In addition, in this thesis, it is proposed that the CP in multiphase ion-intercalation materials can lead to phase re-distribution and can be used for non-volatile memories. A general phase-field model has …
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Ignition by Nanosecond Repetitively Pulsed Discharges
… pulse energy, or discharge size. Therefore, a model allowing for parametric explorations is needed to separate the influence of each variable on plasma-assisted ignition. This work presents the development of both (i) a zero-dimensional (0D) chemical model for plasma-assisted combustion …
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Simulation of suspended sediment and contaminant transport in shallow water using two-dimensional depth-averaged model with unstructured meshes
… In 2008, Dr. Liu developed a two-dimensional model HydroSed which solves for 2D shallow water equations and sediment bedload transport equation at Hydrosystems Laboratory, UIUC. In this thesis, the author further modifi es and improves the HydroSedv1.0 model so that the model is able to deal …
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Solidification in a thin liquid film : growing Alq₃ needles via methanol-vapor annealing
… we explore this system through experiments, modeling, and analytical scaling laws. The first part of this thesis describes the growth of single-crystal Alq₃ needles from amorphous, thin films of Alq₃ annealed in methanol vapor. Micrographs captured during annealing reveal needle lengths that …
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Framework for a Unified Macroscale Model of Magnetostriction
… of a framework for a unified mutliscale model of magnetostriction. The lack of accurate models of macroscale hysteretic magnetostriction has inhibited the development of novel devices and savings. This thesis presents a framework for such a model. After motivating and providing the …
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Comparison and Investigation of Solar Spectral Irradiance with Solar Aspect Monitor
… infrared (NIR). A single-scattering Rayleigh model is developed to eliminate the scattered brightness below 90 km and an inversion technique is applied on limb-scanned radiance profiles at 236.5 nm, NO (0,1) gamma band. The ISS orbit allows observations from 7:00 to 16:00 local hours over a …
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Spatial Variability in Seepage from Unlined, Open Channels
… or one-, two-, or even three-dimensional (1D, 2D, or 3D) numerical models that combine heat transport and fluid flux equations. This work compared the advantages and limitations of one- vs. two-dimensional numerical models and the applicability of the Stallman analytical solution for use in …
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The design and thermal measurement of III-V integrated micro-coolers for thermal management of microwave devices
… due to cooling or probe loading was developed. A 1D model for the integrated micro-cooler was developed and the results indicated that when the micro-cooler was used as a cooling element in a monolithic microwave integrated circuit, the supporting substrate thickness was very important. Simulation …
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