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 15 of 15 for “"Phase Models"”.
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Numerical simulation of multi-scale transport processes and reactions in pem fuel cells using two-phase models
… The modeling approach utilized the two-phase models involving water phase change for PEM fuel cells i.e. two-phase current (solid and membrane), two-phase flow (gas and liquid water) and two-phase temperature (fluid and solid). The catalyst layer has been modeled using the microscale …
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Modeling phase synchronization of interacting neuronal populations : from phase reductions to collective behavior of oscillatory neural networks
… is hypothesized to underlie the concept of phase synchronization. Accordingly, phase models have found their way into neuroscience. The concepts of neural synchrony and oscillations are introduced in Chapter 1 and linked to phase synchronization phenomena in oscillatory neural networks. …
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Modelling of an industrial fluidised bed dryer
… performance accurately as no general application models have been published. To investigate the coupled relationship between the operating parameters, fluidisation regimes and drying performance, the drying of industrial nylon-6.6 polymer particles (Geldart Type D) was studied both at laboratory …
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Development and validation of a novel hybrid CFD slurry model
… computational fluid dynamics (CFD), using a two phase model: one phase for the fluid, one phase for the particles.;The two phase models can, broadly speaking, be separated into two categories: Euler-Euler (EE), and Euler-Lagrange (EL). EE models the fluid and particles as two continua, is fast to …
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Studies in Vapour-Liquid Equilibria
… and thus both the addition of new liquid phase models and "debugging" have been made easier. An additional vapour pressure equation, the Harlacher equation, was introduced into the data reduction program to investigate whether its use improved data-fitting. This equation was compared with …
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A General Modeling Framework for Cost Benefit Analysis of Remanufacturing
… modeling framework consists of three phases: take back, disassembly & reassembly, and resale. The first phase considers the process of buying back the used product from the customers, the second phase focused on modeling the disassembly of the taken back product into its cores and …
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Circadian disruption causes deficits in attention and response inhibition in adult Long-Evans rats
… LAN). Our study investigated the effects of 2 models of circadian disruption on response inhibition, which has previously been unaddressed, and attention using a 5-choice serial reaction time task (5-CSRTT). Adult Long-Evans rats of both sexes were maintained on a 12h:12h light:dark cycle and …
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Structure and Mechanical Properties of Cement and Intermetallic Compounds via ab-initio Simulations
… is immense since they are the primary binding phases for Portland cement derived construction materials. Efforts spanning centuries have been devoted to understand the structural aspects of cohesion in these minerals. In recent years, the focus has progressively turned to atomic level …
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Two-phase modelling of debris flow over composite topography: theoretical and numerical aspects
… Good and reliable mathematical and numerical models, able to accurately describe these phenomena are therefore necessary. Debris flows and hyper-concentrated flows can be adequately represented by means of a mixture of a fluid (usually water) and a solid phase (granular sediment, e.g. sand, …
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Optimal Control of Weakly Forced Nonlinear Oscillators
… the optimal control strategies derived using the models of phase reduction by applying them to the corresponding original full state-space models. This validation is largely missing in the literature. Moreover, the derived optimal controls have been experimentally applied to control the …
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Use of computational fluid dynamics in the design of bubble column reactors
… techniques that depict the transport of discrete phases (gas bubbles or solid particles) and model biochemical reactions in a bubble column reactor are discussed here. The mixture model was used to calculate gas-liquid, solid-liquid and gasliquid-solid interactions. Multiphase flow is a difficult …
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Experimental and Simulation Study of Relative Permeabilities in Heavy Oil/Water/Gas Systems
… and relative permeabilities of the involved phases were determined. Athabasca bitumen was used as the oil phase and distilled water and nitrogen were used as the water and gas phases respectively. A vertical sand-pack core-holder of 1.5 inch diameter and 2 feet long was designed and …
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JOINT MODELING OF MULTIVARIATE LONGITUDINAL DATA AND COMPETING RISKS DATA
… types). Our joint model consists of two sub-models: a system of non-linear mixed effects sub-models for the multiple longitudinal responses; and a system of cause-specific hazards frailty submodels for competing risks, with associations among multiple longitudinal responses andmultiple …
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Measurements and analysis of the microwave dielectric properties of tissues
… to describe the dielectric properties of two-phase mixtures in terms of the dielectric properties and volume fractions of the component phases. Biological tissues are very much more complex than these two phase models. However, comparisons of the observed dielectric properties as a function of …
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Well balanced Arbitrary-Lagrangian-Eulerian Finite Volume schemes on moving nonconforming meshes for non-conservative Hyperbolic systems
… equations to complex free surface flows in two-phase models. In the last case, studied on fixed Cartesian grids, the new well balanced methods have been implemented in parallel exploiting a GPU-based platform and reaching the very high efficiency of ten million of volumes processed per seconds. …