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 32 for “"Two-Layer Model"”.
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Gas Transport In Two-Layer Proton Exchange Membranes
… is to use a thin, low-permeability anode prelayer (LPAP) film with significant resistance to SO2 transport supported on a membrane with high proton conductivity. However, it is difficult to measure the properties of the LPAP film since this layer is not free standing. Hence, we have developed …
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Geostrophic vortex dynamics
… of contour dynamics to the quasigeostrophic two layer model, we have proposed and solved a number of fundamental problems in the dynamics of rotating and stratified vorticity fields. A variety of rotating and translating potential vorticity equilibria (V-states) in one and two layers have …
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Baroclinic instability of a meridionally varying basic state
… in a meridionally varying version of Phillips' two-layer model. It is shown in chapter four that interactions between neutral modes and the unstable mode strongly influence the evolution of the latter and are capable of stabilising it before significant changes occur in the zonally averaged …
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The thermocline and current structure in subtropical/subpolar basins
… the thermocline and the current pattern within a two-layer model. The corresponding flow field is explored as the amount of water in the upper layer is gradually reduced (or as the wind stress is gradually increased). In the model, when the amount of water in the upper layer is less than a first …
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Cerebral Hemodynamics and Its Oxygenation: Study of Their Baseline and Spontaneous Oscillation
… on the adult forehead were analyzed using a two-layer model of the adult head. The average values of the hemodynamic parameters and their fluctuations were determined for a group of 30 subjects. In addition to base line, we also investigated cerebral vasomotion which results in spontaneous …
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Pipeline flow of coarse particle slurries
… investigation and a presentation of improved modelling techniques for determining pipeline design parameters. The experimental investigation was carried out to obtain an improved database for modelling the flow of coarse-particle slurries. Tests were conducted using sand slurries and coal …
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A machine learning model for vehicle crash type prediction
… the occurrence of different types of crashes. A two-layer model is proposed. The first layer is used to distinguish potential crashes from crash-free observations and the second layer is used for crash type recognition. The results show that the proposed model can detect the potential accident …
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The vertical structure of the bottom boundary layer on the southern flank of the George Bank during late winter
The bottom boundary layer structure on the southern flank of Georges Bank was investigated for the period February 19 to March 20, 1995. During this time, vertical stratification was weak and the near bottom waters were almost homogeneous. Georges Bank is a region of strong tidal currents, with the …
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Mechanistic models of oceanic nitrogen fixation
… employ simple analytical theories and numerical models of ecosystems and biogeochemical cycles, and closely refer to direct observations of the phytoplanktonic community and geochemical tracers of the marine nitrogen cycle. Time-series observations of geochemical tracers and abundances of …
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Effects of surface roughness on the flow characteristics in a turbulent boundary layer
… the structure and dynamics of turbulent boundary layers on aerodynamically smooth walls has been clarified over the last decade or so. However, the dynamics of turbulent boundary layers over rough surfaces is much less well known. Nevertheless, there are many industrial and environmental flow …
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The influence of a steady baroclinic deep ocean on the shelf
… shelf is examined using steady, boundary forced models which incorporate bottom friction. One set of models, for a vertically well mixed shelf, includes the horizontal advection of density. The second set of models comprises a three-layer model without and a two-layer model with interfacial …
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Stability of a coastal upwelling front over topography
A two-layer shallow water equation model is used to investigate the linear stability of a coastal upwelling front. The model features a surface front near a coastal boundary and bottom topography which is an arbitrary function of the cross-shelf coordinate. By combining the various conservation …
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New turbulence models for indoor airflow simulation
… The CFD technique requires a turbulence model to correctly calculate indoor air distribution. However, the currently available turbulence models in the literature are either inaccurate or inefficient for the indoor environment predictions. To solve the problem, this thesis proposes two …
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Ridge waves
… the effects of stratification, represented by a two-layer model, are explored by a perturbation procedure for weak stratification. The 0(1) barotropic basic state is accompanied by an 0(E2) baroclinic perturbation. The frequencies of the barotropic modes are increased and the velocities are …
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Estimation of Driver Behavior for Autonomous Vehicle Applications
… estimation through the unified development of two theoretical concepts, namely: Graphical models, and Hybrid State Systems. Hybrid State Systems (HSS) provide the qualitative relationship between driver/vehicle couplings through a two layer model. Pattern recognition techniques in conjunction …
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Digital Simulative Test of Asphalt Mixtures Using Finite Element Method and X-Ray Tomography Images
… different material properties. Aggregates are modeled as an elastic material, and air voids are removed during the loading steps. The adopted two-layer model is only used to represent the rate and temperature dependent behavior of the mastics. The parameters are obtained with inverse methods. …
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The structure and transport of the Brazil Current between 27⁰ and 26⁰ South
… estimates farther north. Downstream, surface layer transport increases, the current deepens, and the transport reaches a maximum of 80 Sv at 36°S. Part of the growth comes from the tight recirculation found just offshore of the Brazil Current. The recirculation strengthens and deepens to the …
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Studies of Warm-Core Rings Using a Particle-in-Cell Method
<p>A particle-in-cell (PIC) model is developed and applied to problems involving the evolution of warm-core rings. Such models are a hybrid of conventional Eulerian and Lagrangian models. They are ideally suited for problems in which a lower layer outcrops to the surface, such as at the boundary of …
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Sedimentation on a mixed siliciclastic/carbonate continental margin over decadal to millennial timescales: Gulf of Papua
… downslope through a combination of nepheloid-layer flow and possible turbidity-currents. For the cores located between shelf edge and lower slope, biodiffusion coefficients and mixing depths exhibit a decreasing trend with increasing water depth. Using a two-layer model, biodiffusion …
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Electromagnetic methods for measuring material properties of cylindrical rods and array probes for rapid flaw inspection
… drop on the surface of a homogeneous rod, a two-layered and a three-layered rod. By fitting model results to multi-frequency ACPD experimental data, estimates of conductivity, permeability and case depth are found. Although the estimated case depth by the two-layer model is in reasonable …
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