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 169 for “"mechanistic model"”.
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A Mechanistic Model for Flooding in Vertical Tubes
… a universally accepted rigorous physics-based model of flooding, even for the simple case of flooding in adiabatic, vertical tubes. This can be attributed to a lack of conclusive understanding of the physics of two-phase counter-current flow, specifically the mechanism of flooding, and the …
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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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Determination of Energy Efficiency of Beef Cows under Grazing Conditions Using a Mechanistic Model and the Evaluation of a Slow-Release Urea Product for Finishing Beef Cattle
… The objective of study 1 was to utilize a mechanistic nutrition model to estimate metabolizable energy requirement (MER) of grazing cows based on changes in cow body weight (BW) and fatness measurements (body condition score, BCS) along with calf age and BW, as well as forage quality and …
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Assessing the Impact on Hydrocarbon Production from Tight and Shale Plays by Depletion and Injection Using Thermodynamic and Transport Properties from Confined Spaces
… and of great importance. In this study, a mechanistic model of both depletion and injection for well performance prediction of unconventional reservoirs was developed, incorporating capillary pressure and pore size distribution, to provide a comprehensive approach to simulate the effect of …
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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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