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 326 for “"transport model"”.
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Theoretical transport model for tokamaks
In the present thesis work a theoretical transport model is suggested to study the anomalous transport of plasma particles and energy across the axisymmetric equilibrium toroidal magnetic flux surfaces in tokamaks. The model suggests a linear combination of two transport mechanisms; drift waves, …
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One dimensional pollutant transport model
… thesis presents the development of a numerical model for one-dimensional pollutant transport in a porous medium. A computer program POLUTE1D has been developed. The numerical model is based on the flow and mass transport equations and the finite element method has been used for its formulation. …
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Development of an analytical groundwater contaminant transport model
… professionals consist of complex mathematical models that are neither widely available nor easy to use. An analytical groundwater contaminant transport model (the aquifer model) was developed to provide professionals with robust simple-to-use tools to evaluate the performance of an OWS. The …
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A coarse grained transport model for nanofluidic systems
… the interest in efficient coarse-grained (CG) models. Although many existing CG models for various fluids are able to capture structure and dynamics of the bulk fluid accurately, these models are not suited to describe transport phenomena involving explicit walls in nano-channels. Previous …
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Formulation of a full dynamic transport model for heterojunction devices
In this thesis a Full Dynamic Transport Model is presented which consists of the Momentum Conservation Equation (MCE), Energy Conservation Equation (ECE), Particle Conservation Equation (PCE), and Poisson's Equation. In our model carrier velocity and electron energy are taken as variables and have …
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A ballistic transport model for HEMTs and III-V MOSFETs
… allow a more thorough exploration into the basic transport physics of a quantum-well III-V device. We know from HEMT experimental data that electrons travel ballistically at gate lengths of 30- 40 nm, suggesting that a ballistic transport model will only become more accurate as channel lengths are …
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Tearing-mode transport model in the reversed field pinch concept
In this thesis, a self-consistent model for analyzing the transport performance of a Reversed Field Pinch (RFP)-type of thermonuclear fusion reactor has been developed. The study has been focused on determining equilibrium configurations which describe a plasma evolution dominated by particular …
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Calibration and Application of a Tokamak Transport Model in JT-60
Made available in DSpace on 2017-07-06T18:55:56Z (GMT). No. of bitstreams: 3 Qiang_Ji_MS.pdf: 35343136 bytes, checksum: 8ce13f4efd0ee142481f85546a2da681 (MD5) Qiang_Ji_MS_ABS.pdf: 564375 bytes, checksum: 1078b3fa5ba98935f52ddec51f0dfcc3 (MD5) license.txt: 4813 bytes, checksum: …
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Systematic calibration of a theory-based transport model of tokamak plasmas
A time-dependent theoretical model of flux-surface-averaged radial transport in tokamaks has been constructed and calibrated against a well documented set of temperature and density profiles from a pre-defined set of twelve discharges from seven different tokamaks. The transport theory includes …
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Investigating uranium mobility using groundwater 238U/235U data and a reactive transport model
… chemical reactions affecting the subsurface transport of the widespread contaminant uranium (U), we present a numerical reactive transport model which explicitly incorporates variations in the 238U/235U isotope ratio. Bioremediation, the microbial reductive immobilization of aqueous U(VI) to …
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Coupled Sediment Yield And Sediment Transport Model To Support Navigation Planning In Northeast Brazil
… obstacle to maintaining sustainable riverine transportation of bulk goods (primarily agricultural and mining commodities). The rate of aggradation of sediment in a waterway is directly related to both the rate of sediment erosion from upland and river bank sources (sediment yield) and the …
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Investigation of a stochastic solute transport model and development of inverse methods in hydrogeology
… encompasses two aspects of stochastic solute transport modelling in porous media. One part is dedicated to investigating a stochastic transport model. In the second part, two types of inverse methods are developed to solve the inverse problem in stochastic contaminant transport modelling of …
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A kinetic transport model of uranium molecular species formation in a laser ablated plasma plume
… former problem by developing a plasma-chemistry model of uranium molecular species formation during the early stages of nuclear fireball expansion. The model features a newly constructed U$_x$O$_y$ reaction mechanism that consists of 30 reaction channels for 11 uranium molecular species, …
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The MEso-SCAle Particle Transport model (MESCAPT) for studying sediment dynamics during storms and tsunamis
… tackle the problem with the MEso-SCAle Particle Transport model (MESCAPT) that combines the advantages of concentration-based Eulerian methods and particle-based method. The advantage of the former is efficiency and the latter is detailed sediment transport and deposit information. Instead of …
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Development of Measurement Methods for Application to a Wind Tunnel Test of an Advanced Transport Model
… will complete a wind tunnel test on the Advanced Model for Extreme Lift and Improved Aeroacoustics (AMELIA) in the National Full-Scale Aerodynamics Complex (NFAC) 40 foot by 80 foot wind tunnel at NASA Ames Research Center in the summer of 2011. The development of two measurement techniques is …
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Groundwater flow and mass transport model of the main base landfill a the Massachusetts Military Reservation
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1996.
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From traffic to transmission: adapting an agent-based transport model to simulate the spreading of infectious diseases
… in 2020, driven by the need for computer models to assist policymakers in making decisions about mitigation strategies. The thesis presents an approach to simulate the spreading of infectious diseases, such as COVID-19, by integrating transport modeling with epidemiological methods. The …
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Estimation of methane and carbon dioxide surface fluxes using a 3-D global atmospheric chemical transport model
… we describe our participation in a CO₂ inverse-modeling intercomparison. The available methane time-series data used in this work include observations from 13 high-frequency stations (in-situ) and 74 low-frequency sites (flask). We also construct an annually-repeating reference emissions field …
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