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 16 of 16 for “"Charge Model"”.
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A compact transport and charge model for GaN-based high electron mobility transistors for RF applications
… a rapidly evolving technology, compact device models are essential. In this thesis, a physics-based compact model is developed for short channel GaN HEMTs. The model is based on the concept of virtual source (VS) transport originally developed for scaled silicon field effect transistors. …
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Evaluation of microwave microscopy for dielectric characterisation
A widely used analytical, image charge, model of the SNMM was analysed for the first time in terms of its ability to predict the response of the SNMM to both bulk and thin film dielectrics. For the first time it was shown that the uncertainty in fitting to the model reduces from 10% to 5% when the …
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Fast, efficient generation of high-quality atomic charges
The novel AM1-BCC charge model quickly and efficiently generates high-quality atomic charges for organic molecules suitable for computer simulations in the solution phase. The concept of the AM1-BCC charge model is to produce atomic charges that emulate the HF/6-31G* electrostatic potential (ESP). …
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Local energy management through mathematical modeling and optimization
(cont.) Extensions to the core TOTEM model include a demand charge model, used for making daily optimal control decisions when the electric bill includes a charge based on the monthly maximum power draw. The problem of heating, ventilation, and air conditioning (HVAC) control is treated separately …
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Grain boundary chemistry and morphology of heavily doped cerium dioxide
Ceria is a model system for oxygen ion conducting ceramics of the cubic fluorite structure, in which grain boundaries are known to limit the overall ionic conductivity of polycrystals. Measurements of grain boundary segregation of the aliovalent dopants Gd3+ and Ta5+ in heavily doped ceria have …
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Matsubara Dynamics and its Practical Implementation
… Poulsen $\textit{et al}$. called the planetary model. We show that the planetary model is based on a harmonic approximation to Matsubara dynamics that is engineered to maintain the conservation of the quantum Boltzmann distribution, so quantum statistics and classical dynamics remain harmonised. …
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High frequency phonon propagation and detection in III-V semiconductors
… calculations incorporating Rigid Ion and Bond-Charge lattice dynamics models. The Bond-Charge model more accurately predicts the evolution of the phonon-focusing pattern in the frequency range investigated. Predictions of the focusing pattern for very high frequency phonons ( v > 1012 Hz) are …
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Thermodynamics of Buried Water in Protein Cavities and Revised Algorithms for Introducing Polarizability to Molecular Dynamics Simulations
… is also analyzed. Changes to the fluctuating charge algorithm that handles polarizability in molecular dynamics simulations were performed to allow for longer time steps. The fluctuating charge model treats partial charges as variables which are propagated using Lagrangian dynamics. A …
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Optimal staffing recommendation for inbound operations
… operations are staffed following a 'staffing-to-charge' model in which labor is planned to match the incoming volume capacity required by the weekly Sales Operations Planning (S&OP) forecast. Staffing-to-charge is a lean model of staffing that attempts to maximize labor utilization by minimizing …
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A Study of Dynamics and Stability of Two-Craft Coulomb Tether Formations
… controlled using electrostatic Coulomb forces. A charge feedback law is introduced to stabilize the relative distance between the satellites to a constant value. Compared to previous Coulomb thrusting research, this is the first feedback control law that stabilizes a particular formation shape. …
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Quantum Mechanical Study of Spin-Forbidden Reactions in Organometallic Catalysis and Astrochemistry
… Morse empirical potential from an electrostatic model. In the first part, the role of triplet electronic state in spin-accelerated iron-catalyzed C(sp2)-H bond activation in a-benzoquinoline molecule is studied. The C-H activation facilitated by the electron donation from the sigma-bond to the …
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TRANSVERSE CHARACTERIZATION AND CONTROL OF BEAMS WITH SPACE CHARGE
… by interparticle forces known as the space charge forces. Therefore, it is increasingly important to take space charge into account in studying the beam dynamics. In this thesis, two novel approaches are presented for measurement of transverse emittance for beams with space charge, an …
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Improvement and validation of a thermodynamic S.I. engine simulation code
… for a cycle. Although generated principally for model validation, the experimental results proved interesting in their own right. Middle, slow and fast cycles were defined for each condition. Analysis of these cycles suggested that there was no correlation between the initial flame centroid …
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Interactions between polyhedral permanent magnets
… primary aim of this thesis is to investigate and model the magnetic fields produced by generalised polyhedral permanent magnets, and the forces and torques between them. To achieve this aim, two main objectives were identified. The first objective was to analytically solve the magnetic charge …
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The Design of a Power System For a Wireless Sensor Network For Long-Term Operation
… One of the central resource constrains is the charge consumption of WSN nodes. With finite energy supplies, low charge consumption is needed to ensure long lifetimes and success of WSNs. This thesis details the design of a power system to support long-term operation of WSNs. The power system’s …
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Electrical, Magnetic, Thermal Modeling and Analysis of a 5000A Solid-State Switch Module and Its Application as a DC Circuit Breaker
… used to symmetrical ETOs. An accurate device model of the ETO is needed for the development of the high-current DC switch module. In this dissertation a novel physics-base lumped charge model is developed for the ETO thyristor for the first time. This model is verified experimentally and used …