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 49 for “"Semi-empirical Model"”.
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Simulation of dynamic response of Self-Powered-Inconel-Neutron-Detector lead cables using a semi-empirical model
The work presented here was devoted to the modelling and simulation of the dynamic response of lead cables of Inconel self-powered neutron detectors in a CANDUpower reactor. The main goal was to develop a semi-empirical dynamic model of theInconel lead-cables in Ontario Power Generation’s …
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Processing Dependent Mechanical Behavior and Molecular Structure of Electrospun Polymeric Nanofibers
Finally, a semi-empirical model was proposed to capture the viscous response of PAN nanofibers. At small viscoelastic deformations, the model is composed of a set of linear springs and dashpots, appropriately assembled to capture the strain rate sensitive elastic modulus and creep behavior of the …
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Estocagem por estratificação térmica de líquido em reservatório
… it is proposed a transient one-dimensional semi-empirical model to the storage system, describing the temperature profile history of.the liquid and the vessel wall, during the normal operating conditions (charging, discharging and static node). The theoretical results are compared to the …
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Thermal Degradation of PC and PA6 During Laser Transmission Welding (LTW)
… (k_0), activation energy (E), and reaction model (f(α))) of the materials using a non-linear model-fitting method. These kinetic triplets were combined with temperature-time data obtained from a Finite Element Method (FEM) simulation of the LTW process to predict material degradation during …
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An analytical investigation of the effect of blade profile variations on the erosion of coal-fired turbine blades
… field was determined for each blade passage. A semi-empirical model of erosion was combined with available experimental data to predict erosion on the blade surfaces. Maximum erosion was found to be at the trailing edge of the stator and rotor and at the leading edge of the rotor. The trailing …
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Chemically Enhanced Physical Vapor Deposition (Cepvd) of Tantalum Nitride-Based Films for Diffusion Barrier Layers Used in ULSI Devices
A zero-order semi-empirical model is established allowing the attachment of physical understanding and CEPVD experimental phenomena. The model stems from the knowledge of reactive sputtering and PECVD processes as well as the acquired CEPVD experiment results. It correlates the processing …
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Pre-ionization studies on the modular theta-pinch experiment for field-reversed configuration applications
A new semi-empirical model is introduced for the quantification of inductively-coupled breakdown systems. The model is informed by breakdown studies conducted on the Modular Theta-pinch eXperiment (MTX). Observations made of inductively-coupled breakdown behaviour are consistent with the model's …
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Electronic and structural properties of rare gas cation clusters
… The Hamiltonian of the system is based on a semi-empirical model whose parameters are obtained through the fitting of experimental and calculated properties such as bond length and dissociation energy of small clusters (N < 6). Since rare gas cation clusters are formed by closed shell atoms …
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Modeling Vortex -Induced Vibration of Long -Span Bridges
… goal of this research was to develop a suitable model, complementary to those existing for flutter and buffeting, which improves current techniques for the prediction of vortex-induced vibration of non-circular sections representative of bridge decks. Wind tunnel experiments of six spring-mounted …
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An investigation into the origin, measurement and application of chemiluminescent light emissions from premixed flames
… is clarified and an accurate chemical kinetic model predicting OH* chemiluminescence emission is developed using GRIMECH 3.0 as a starting point for methane oxidation. CH* chemiluminescence is also modeled but difficulties in obtaining quenching data make the modeling efforts somewhat less …
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Ecological site quality, site index, and height growth of white spruce stands in the sub-boreal spruce zone of British Columbia
… classification, statistical analysis, and growth modelling. Using vegetation classification, the study stands were organized into eight seral plant associations on the basis of differences in the floristic composition of understory vegetation. The ratio of actual/potential evapotranspiration and …
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Performance of RC Bridge Columns under Cyclic Combined Loading including Torsion
… loading by unifying the decoupled damage index models for flexure and torsion. Moreover, a semi-empirical model was established to predict the interaction between bending, shear and torsional loads. It was found that the strength and stiffness degradation and progression of damage were amplified …
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Studies On Copper Extraction With Hydroxyoxime Extractants For The Design Of Hollow Fibre Membrane Based Extraction Processes
… of measurement techniques and mathematical models proposed in the literature to assess the equilibrium and mass transfer data of metal extraction by the use of chelating agents. The limitations of these techniques and models have been highlighted.<br/><br/>Three chelating extractants diluted …
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Mathematical modelling of the development of cyanobacteria (blue-green algae) in an eutrophical lake, including aspects of toxicology
… population is described by a dynamical model which accounts for a number of factors including algal growth, degradation and light driven buoyancy. The work in this thesis describes the development of a cyanobacterial cell buoyancy function which is then used, in conjunction with the …
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Análise crítica de um modelo fenomenológico de vibrações induzidas por vórtices via análise de sensibilidade global e quantificação de incertezas
… offshore industry. Therefore, phenomenological models continue to be developed and popularised to the prediction of VIV, allowing its low computational time to be explored via global sensitivity analysis (GSA) and uncertainty analysis, which could result in the model enhancement, allowing it to …
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Oil retention and pressure drop of R1234yf and R134a with POE ISO 32 in suction lines
… lines retain more oil than vertical lines. A semi-empirical model for prediction of oil retention and pressure drop in vertical suction lines in annular flow regime is presented. The model predicts 90% of the oil retention and pressure drop within ± 20% and ± 30% of the experimental data. The …
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Integration of Satellite Remote Sensing and Ground-based Measurement for Modelling the Spatiotemporal Distribution of Fine Particulate Matter at a Regional Scale
… to spatial-temporal scale changes. Further, a semi-empirical model has been developed for a more accurate prediction of GL-[PM2.5]. The model employs MODIS AOD data, assimilated meteorological fields, and ground-based meteorological measurements and is able to explain 65% of the variability in …
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Aerosol Filtration And Separation
… transition behavior are explored. Moreover, an empirical model for predicting the loading curves for particles coated with liquids of different viscosity is proposed. For the second part, Inertial Separation, a cascade multistage axial cyclone which is capable of classifying particles from 10 μm …
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Developments in the Theory of X-ray Absorption and Compton Scattering.
… spectra. In this thesis I present a simplified, semi-empirical model which describes charge-transfer excitations in XAS, thus extending the formulations of Lee, Gunarson, and Hedin. I model the XAS by a localized three-state system coupled to a photoelectron, and implemented using FEFF real space …
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MODELLING CRYSTALLIZATION FOULING IN LIQUID-TO-AIR MEMBRANE ENERGY EXCHANGERS
… and air-conditioning (HVAC) systems. A semi-permeable hydrophobic membrane is used in LAMEEs to separate an air stream from an aqueous solution stream while allowing simultaneous heat and moisture transfer between the streams. However, the membrane of LAMEEs may be subjected to …
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