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 19 of 19 for “"mesoscale model"”.
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Multi-scale investigation of vacancy-mediated diffusion of Si in Ni near an edge dislocation
… solutes. In this work, we develop a multi-scale model which is able to simulate the diffusion of point-defects and solute atoms in the dislocation strain field. We first use kinetic Monte Carlo simulations to investigate the strain effects on the transport coefficients for vacancies and Si in FCC …
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Cell dynamical system approach to block copolymers
In this thesis we discuss a mesoscale model of block-copolymer (BCP) microphase separation dynamics based on a cell dynamics system (CDS) model. The model suggests a partial differential equation (PDE) model that allows us to find a close relation between the block copolymer and spinodal …
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Classification of summertime West Coast fog and stratus events and the development of fog and stratus forecast techniques
… synoptic-scale weather patterns as well as the mesoscale coastal regime were then associated with a type of stratus evolution. The Navygass mesoscale model, coupled ocean/atmosphere mesoscale prediction system (COAMPS), provided detailed simulation of 11 events to highlight the boundary layer …
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Air pollution modeling
Three air pollution models are presented which address themselves to the specific problems of 1) pinpointing locations of relative maxima, 2) producing air quality maps efficiently, and 3) presenting. graphic representation of patterns of pollution over a mesoscale region. MAXPOL-A is a …
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Forecasting the nighttime evolution of radio wave ducting in complex terrain using the MM5 numerical weather model
This study tests the effectiveness of using mesoscale models to forecast operationally those atmospheric conditions that cause anomalous propagation of radio waves. Providing early warning about where and when such conditions will develop would be particularly useful for military communications. To …
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An observational and modeling study of a heavy orographic precipitation event over the Oregon Cascades
… provided a unique chance to isolate errors in a mesoscale scale model's microphysical parameterization which may be contributing to errors in quantitative precipitation forecasting. The Fifth Generation Penn State/NCAR Mesoscale Model (MM5) version 3.5 was run at various resolutions to simulate …
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Tropical observability and predictability
… data assimilation in the context of global models or specifically for tropical cyclones, but relatively few have focused on the mesoscale predictability and observability of the general tropical environment. This work constructs an ensemble data assimilation system for the tropics using a …
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Temporal and Geographical Variation in Martian Surface Dust Lifting Processes
… investigated using a Martian Global Circulation Model. The geographical representation of Martian dust lifting by wind stress was used to explore the experimental impact of changes in model resolution. It was found that increasing the resolution improved the model's geographical representation of …
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Modelling the impact of urbanisation on the regional climate of the Greater London area
… and regional climate by means of the numerical mesoscale model METRAS (Schlünzen 1988) coupled for the first time with the sophisticated urban canopy scheme BEP, developed by Martilli et al. (2002). The robustness of the new model is demonstrated through a series of simulations and sensitivity …
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Effect of Chemistry on Electrodynamics in the Martian Dynamo Region
… are still mostly magnetized. We adopt a mesoscale model to simulate dynamics of electrons and ions in the upper atmosphere (100–400 km). Our approach focuses on numerical studies using the Martian Multifluid Magnetohy drodynamic (MF-MHD) Model (M4). The dynamo is a region which varies in …
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Atmospheric dispersion modelling of particulate and gaseous pollutants affecting the trans-Manche region
… to identify pollution sources using dispersion modelling with the assistance of ground level measurements from British, French and other monitoring stations and remote sensing technology. Lagrangian Particle Dispersion (LPD) models compute trajectories of a large number of notional particles and …
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Application of the Weather Research and Forecasting (WRF) Model to Simulate a Squall Line: Implications of Choosing Parameterization Scheme Combinations and Model Initialization Data Sets
… of accurate forecasting for public safety. Mesoscale Modeling plays an important role in any forecast of a potential squall line. The focus of this study was to examine the performance of several parameterization scheme combinations in the Weather Research and Forecasting Model version three …
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Improvement of MM5 Model Forecast by Ingesting Newly Archived Satellite Data and Estimation of Forest Fire Emissions Contribution to Ozone Peaks Using CMAQ Modeling System
Meteorological and air quality modeling present many challenges in regards to accuracy and verification. This dissertation focuses on three major challenges and provides a discussion of the modeling results. The Fifth-Generation Penn State University-National Center for Atmospheric Research (NCAR) …
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Flash Flooding in Eastern Kentucky: An Analysis of the 3-4 August 2001 Event
… for flash flooding. Numerical forecasting models also help forecasters, especially when necessary data does not exist for the forecast area. One such model is the Penn State/ NCAR Mesoscale Model MM5. This model consists of several options allowing for variations in climate and terrain. MM5 …
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On the plastic deformation behaviour of nickel-based superalloys: low cycle fatigue and stress orientation effects
… of stacking faults. A series of experimental and modelling techniques are employed throughout the thesis. Low cycle fatigue is investigated with the motivation of understanding how slip bands form and develop prior to crack initiation. Electron microscopy techniques are used in alloy RR1000 to …
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Entropy, Energy and Dynamics of Coalescing Spherical and 1D Aerosols
… their potential for detachment. The current mesoscale model of single-walled carbon nanotubes (SWCNTs) is extended to multi-walled carbon nanotubes (MWCNTs) with a new force field and force constants. The general adhesion energy of all the cylindrical MWCNTs, independent of the layer number, …
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Atmospheric controls on soil moisture-boundary layer interactions
… index, proved most effective. A one-dimensional model of the planetary boundary layer (BL) and surface energy budget has been modified to allow the growing BL to entrain air from an observed atmospheric sounding. The model is used to analyze the impact of soil saturation on BL development and the …
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Effect of concrete heterogeneity on FRP-to-concrete bond behaviour
… FRP-to-concrete bonded joint with the focus on mesoscale mechanical behaviour of concrete and the effect of concrete heterogeneity. <br/>A 2D mesoscale modelling framework is proposed, integrating the capabilities of generating mesoscale geometric structures with Matlab programming, …
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The use of gamma distributions to quantify the dependence of cloud particle size distributions in hurricanes on cloud and environmental conditions
Mesoscale models that predict the temporal evolution of tropical cyclones (TCs) are sensitive to the representation of cloud microphysical processes through their effect on modeled latent heat release. The cloud parameterizations used in such models make assumptions about the size distributions …