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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 31 for “"semi-empirical models"”.
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Development of semi-empirical models to measure mass flow rate of solids in an air seeder
… was chosen as the dependent variable. An earlier empirical model for mass flow measurement was developed prior to this research. But that model was only valid under its test condition and did not provide any insight on the flow mechanism. Hence, this investigation developed models based on …
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Rain attenuation and depolarization along 10 to 30 GHz earth space links predicted from s-band dual-polarized radar measurements
… data collected along the path. Then, two semi-empirical models are developed which predict attenuation from radar measured reflectivity and differential reflectivity. These two semi-empirical models are used to evaluate FORWP. Finally, attenuation predictions of FORWP are compared to the …
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Modelling of Wall Pressure Fluctuations Induced by Turbulent Boundary Layer Flow
Semi-empirical models are used to predict the power spectral density of wall pressure fluctuations in the turbulent boundary layer. From the analysis of current semi-empirical models and a large survey of experimental data, it was found that the models proposed by Goody and Smol'yakov have the …
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Combined Modeling and Experimental Validation of Boiling Curve and Critical Heat Flux
… which equals or supersedes most available semi-empirical models or correlations. This model captures and correctly describes the stochastic nature of the flow and thermal variations, as well as the tightly coupled bubble motion in the flow and thermal fields. This suggests that to extend …
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Calibration of empirical, semi-empirical, and physics-based material models for the prediction of creep and tensile behaviour of Alloy 617
Material models are powerful analytical tools for predicting material behaviour under various loading conditions. These models vary in complexity, progressing from empirical models that rely solely on fitting experimental data, to semi-empirical models that incorporate simplified physical concepts, …
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Simple Techniques for the Implementation of the Mechanics of Unsaturated Soils into Engineering Practice
… soils and (ii) development of (numerical, empirical or semi-empirical) models to estimate the variation of mechanical properties of unsaturated soils with respect to suction based on the experimental results. Implementation of the mechanics of unsaturated soils in conventional geotechnical …
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Learning hydrodynamic coefficient databases for vortex induced vibration prediction of marine risers using sparse sensor measurements
Semi-empirical models are currently the state-of-the-art technology for flexible cylinder vortex induced vibrations (VIV) predictive modelling. Accurate prediction of the structural response relies heavily on the accuracy of the acquired hydrodynamic coefficient database. Due to the large number of …
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Effect of exposure on the erodibility of intertidal mudflats
… to 21.5 times compared with 6 h of exposure. Semi-empirical models fitted datasets from Exp.1 and Exp. 2 were used to predict the variations of Ƭ𝒸ᵣ and ER as functions of air temperature, T (°C) and exposure duration, D (h). These semi-empirical models were used to extend a Delft3D numerical …
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Approaches to modeling pathogen and natural organic matter removals in slow-rate biofilters
… This research addresses the problem by deriving semi-empirical models that predict pathogen and natural organic matter removals within these natural and engineered sand filters. The more complex pathogen model, or phenomenological colloidal filtration theory (pCFT), applies the 1937 Iwasaki …
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Modeling event-based coupled hydrologic and mass transport in small urban watersheds
… systems or distributed systems, physically-based semi-empirical models were developed to simulate particulate mass delivery process during rainfall-runoff events. The use of measured particle size distributions (PSDs) as compared to a single particle index such as a d50 was found to have a …
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Kinematic and Thermodynamic Effects on Liquid Lithium Sputtering
… cases. In addition to simulations analytical and semi-empirical models have been developed to help explain lithium-sputtering reductions by deuterium treatment and lithium-sputtering enhancement by possible thermal or displacement spike effects, among other mechanisms.
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Characterisation of cross-linking and moisture ingress detection in an epoxy/amine resin using fibre-optic sensors
… and conventional transmission spectroscopy. Semi-empirical models were used successfully to describe the cross-linking behaviour of the epoxy/amine resin system that was used in this study. Subsequent to monitoring the cross-linking reactions, the fibre-optic sensors were used to study the …
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Development of differential scheme micromechanics modeling framework for predictions of hot-mix asphalt (HMA) complex modulus and experimental validations
… HMA mixtures be estimated for this purpose. Empirical and semi empirical models have been proposed and used. However, these non-fundamental approaches have significant drawbacks, particularly with application of the model for materials that vary from those used in the calibration of the …
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Emitting Wall Boundary Conditions in Continuum Kinetic Simulations: Unlocking the Effects of Energy-Dependent Material Emission on the Plasma Sheath
… relevant physics. A novel implementation of semi-empirical models for electron-impact secondary electron emission into the boundary conditions of a continuum kinetic code is presented here. The features of both high and low energy regimes of emission are represented self-consistently, and the …
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Advancing the computational exploration for thermoelectric materials
… new thermoelectric materials, high-throughput, semi- empirical models have proven to be one of the more fruitful approaches. The best models take into account both electronic and thermal properties since good thermoelectric materials must maintain a difficult balance between the two to achieve …
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Modeling the flow of non-Newtonian fluids in packed beds at the pore scale
… such processes is at the continuum scale. Semi-empirical expressions, such as Darcy's law, are substituted for velocity in the continuity equation, which is then coupled with a momentum, mass, and energy balance. While a continuum approach is acceptable in some cases, additional modeling is …
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Corn root growth and distribution as influenced by soil physical properties
… stimulated suggesting other unknown factors. Two semi-empirical models were developed. One was based on the exponential growth rate of the root system and the other based on the linear growth rate of each root member. These models accounted for the reduction in root growth rate due to the soil …
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Methodology development and evaluation of automotive LiDAR performance in rain
… interactions and develop phenomenological and semi-empirical models to explain the sensor soiling behaviors. In this thesis, a novel realistic rain simulation system was developed to conduct parametric studies on driving speeds, rain intensities, and sensor cover material properties using a …
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Modeling multiphase solid transport velocity in long subsea tiebacks: numerical and experimental methods.
… flow patterns. Minimum transport velocity (MTV) models for suspension and rolling were developed by combining the numerically-developed particle velocity profile models with semi-empirical models for solid particle transport. The models took into account the critical parameters that influence …
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Modeling on single-sided wind-driven natural ventilation
… first part of this study is to develop a simple empirical model for buildings with simple openings. The model is able to accurately predict the mean ventilation rate and fluctuating ventilation rate caused by the pulsating flow and eddy penetration. This new model calculated the eddy penetration …
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