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 165 for “"Mechanistic Model"”.
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A mechanistic model for mid-latitude mean temperature structure
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1979.
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Development of a Predictive and Mechanistic Model for Capacitive Deionization
The objective of this research was to develop a mechanistic and predictive model for capacitive deionization (CDI). The commonly-known Gouy Chapman Stern (GCS) model was modified to account for finite ion size and pore geometry by including the Carnahan-Starling (CS) equation of state and …
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Development of a Mechanistic Model for Geogrid Reinforced Flexible Pavements
This dissertation describes the development of a mechanistic response model for the analysis of geogrid base reinforced flexible pavements and to investigate the response benefit of geogrid-reinforcement. This is an axisymmetric finite element structural model that considers the nonlinear, stress …
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A fogging scrubber to treat diesel exhaust: field testing and a mechanistic model
… DPM removal was aided by the development of a mechanistic model of the fogging scrubber. The model uses the inlet data from the experimental tests as input parameters, and it outputs the outlet concentration of DPM for comparison to the experimental outlet data. Results provided support for the …
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Functional analysis and modelling of vegetation: plant functional types in a mesocosmos experiment and a mechanistic model
… this thesis lies on the functional analysis and modelling of vegetation. A statistical method for the optimisation of plant functional types is developed in the first part. The fourth corner method by Pierre Legendre et al. was adapted to the task of grouping of plant functional types. New null …
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Developing a mechanistic model for flow through a perforated plate with application to screening of particulate materials
… is employed in most mineral processing plants. Models of screening performance have been developed previously with the aim of improving process efficiency. Different methods have been used, such as physical modelling, empirical modelling, and mathematical modelling including the discrete element …
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Developing a novel mechanistic model for four-phase oil-water-gas-sand stratified flow in a horizontal pipe.
… this research aimed to develop and verify a mechanistic model for the stratified four-phase (gas-oil-water-sand) flow in a horizontal pipe. This model takes into account some aspects of the existing multi-layer liquid-liquid and liquid-solid models. The entire stratified flow structure …
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The development of a pseudo-mechanistic model of solar irradiation-induced inactivation of viruses in wastewater and natural waters
… process. To achieve this, however, a predictive model is needed. There have been attempts at modeling a subset of mechanisms of virus inactivation in natural waters and wastewaters but none have addressed exogenous inactivation, which has been demonstrated to be a key contributor to inactivation. …
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Mechanistic modeling of cutting forces in wavy-edge bull-nose helical end-milling of Inconel 718 under different cooling-lubrication strategies
… presents the results of the development of a mechanistic cutting force prediction model for the wavy-edge bull-nose helical endmill (WEBNHE). The mechanistic model was developed to predict cutting force components and the resultant cutting force in high-speed end-milling of Inconel 718 under …
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Discrete modeling of sculptured surface machining for robust automatic feedrate selection
… consists of three distinct portions: a discrete mechanistic model, a discrete geometric model, and a CNC machine model. The mechanistic model estimates cutting forces as a function of cut geometry, cutter/stock relative velocity, and material constants. The geometric model keeps track of the …
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Human Perception of Transient Longitudinal Vehicle Motion
… autonomy. It is therefore desirable to develop a mechanistic model of the vehicle occupant for the prediction of objective and subjective responses to transient longitudinal motion. A measurement system capable of providing the data required for identification of a mechanistic model of the …
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Modeling of non-uniform hydrodynamics and catalytic reaction in a solids-laden riser
… is critical to the development of riser reaction models. The local gas-solids flow structure in riser reactors is highly heterogeneous both in axial and radial direction with back-mixing of catalyst. The radial non-uniform gas-solid flow structure is presented as core-annulus regime, with up-flow …
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Mechanistic analysis of concrete crosstie and fastening system using field-validated finite element model
… tests for the fastening system, rather than a mechanistic design approach. To improve the current design approach, the vertical and lateral load path through the track structure and the component demand within the concrete crosstie and fastening system should be further investigated. In …
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Modeling Manganese Sorption and Surface Oxidation During Filtration
… oxide. This research builds on a previous model developed by Merkle et al. (1997) by either neglecting the empirically determined available fraction of sorption sites (referred to as the "simple" model), which took into account the fact that some adsorption sites in the porous media were …
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A Plasticity Theory of Metals Based on the Dislocation Substructures
A cyclic plasticity model developed from the microscopic deformation mechanism of metals is suggested. In the development of such a mechanistic model, the dislocation substructure of metals under different loadings is studied. Based on the observed substructure, the deformation mechanism of metals …
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Description et analyse d'un modèle de respiration hétérotrophe appliqué à un sol agricole.
This work aimed to describe a mechanistic model for soil heterotrophic respiration, to apply it to an agricultural soil and to specify its important parameters, in order to define future research fields. A complete description of the model structure is given. It uses a daily time step and is …
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A Mechanistic Force Model and Stability Analysis for Contour Turning
… and the cutting stiffness variations. A mechanistic model based force-feedback scheme for disturbance rejection and tracking control in radial contour turning is proposed. The stability issues for the force-feedback design are addressed and the relative tracking performance of …
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Modeling methylmercury in Maine's tribal meres
… 2035 under three different policy scenarios. A mechanistic model of Hg fate and transport was calibrated for Maine's environment using four parameters: volumetric outflow rate, settling velocity, burial velocity, and Hg(II) biotic solids partitioning coefficient. The model was evaluated through …
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Organic reactions catalyzed by copper(I) hydride complexes
… in the linear-selective reaction. Finally, a mechanistic model for the regiodivergence is proposed on the basis of density functional theory calculations. Chapter 3. Enantioselective Ketone Allylation Using Allene, a Petroleum Cracking Byproduct Allene gas is produced and separated on …
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Atomistic modeling and simulations of 2D materials : chemical vapor deposition, nanoporous defects, force-field development, wetting, and friction
… In this thesis: First, I construct a generalized mechanistic model for the growth of TMD monolayers using chemical vapor deposition (CVD). Combining kinetic Monte Carlo (KMC) simulations and a chemical engineering transport model, I am able to predict the experimentally-observed shape and size …
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