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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 70 for “"rate equations"”.
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Solving the system of atomic rate equations during recombination
… present a new method for solving the system of equations throughout the period of recombination. This method allows us to show the effect of individual processes on the total ionization fraction.
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Effectiveness factors in spherical catalyst particles: Langmuir-Hinshelwood rate equations.
Thesis: M.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1965
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Circuit-Level Modeling and Simulation of Semiconductor Lasers
… SABER, is a simple thermal model which incorporates a temperature-dependent offset current into the standard laser rate equations in order to describe thermally dependent threshold current and output-power rollover in the LI characteristics. The second model is a comprehensive circuit level …
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Numerical modeling of chemical recovery from black liquor char
… reactions occurring in dynamic flow conditions. Rate equations for the different chemical reactions are incorporated into a multiphase CFD code MFIX. Rate equations for sulfate reduction by carbon, gasification of carbon by CO2 and H2O, and, COS and H2S formation, are incorporated into MFIX, to …
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Evaluation of off normal temperature events in stored nuclear fuel cladding on storage limits utilizing a modified dating code
… allowed for the development of updated creep rate equations with the forms utilized in past studies by Mayuzumi and Matsuo to be fit. These fit equations along with the original mechanistic creep equations from the DATING code were used to evaluate the effects of off normal temperature events …
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Relaxation of the 1-2 and 2-3 transitions in ruby
… system is described by a set of simultaneous rate equations for the populations of the various energy levels of the system. In the pulse method a quantity proportional to the difference between the populations of two energy levels is measured as a function of time. Since solutions of the rate …
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Ic-Rest(2): A Time-to-Market Driven IC Reliability Statistics Tool
… to the SiO2 and Si-SiO2 defect generation rate equations (in time and space) under static and dynamic operation. The predicted failure statistics are best described by the generalized Gamma-distribution (or more accurately the generalized B-distribution) and on a Gumbel plot look more …
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A Mathematical Model of the Dynamics of an Optically Pumped Codoped Solid State Laser System
… order, nonlinear, coupled, ordinary differential equations which describe the temporal evolution of the dopant electron populations in the laser crystal as well as the photon density in the laser cavity. The analysis of the model is conducted in three parts.</p> <p>First, a detailed explanation of …
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Web-Based On-Line Simulations For Semiconductor Lasers and Their Chirping Problems
… a theoretical model which is based on the rate equations of the earner density, photon density, electron temperature, hole temperature, populations of nonequilibrium longitudinal (LO) and transverse optical (TO) phonons at different wave vectors, and lattice temperatures in semiconductor …
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Applied molecular quantum electrodynamics: geometric aspects of the efficiency of photonic interactions
… are predictions for the efficiency or observable rate. The relative positions and orientations of the molecules and fields are the key variables, so the rate equations are typically complicated functions thereof. Where rate equations depend on molecular orientation, it is often appropriate to …
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Systems Biology in an Imperfect World: Modeling Biological Systems with Incomplete Information
… and when it takes the role of unknown kinetic rate laws. These studies yield interesting results. We show that when metabolism is isolated from gene expression, the effects are not limited to those reactions under strong control by gene expression. Thus, incomplete understanding of molecular …
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CU-CATALYZED CHEMICAL VAPOUR DEPOSITION OF GRAPHENE: SYNTHESIS, CHARACTERIZATION AND GROWTH KINETICS
… large area graphene. By establishing the novel rate equations for graphene nucleation and growth, this study has revealed the essential kinetic characteristics of general Cu-CVD processes. For both the edge-attachment-controlled and the surface-diffusion-controlled growth, the rate equations for …
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An Optimization Method for the Preliminary Design of Interplanetary Aerobraking Missions (Spacecraft, Orbit Mechanics)
… pressure. Hypersonic aerodynamic heating rate equations for two different shield configurations are discussed and their performances are compared. Illustrative numerical examples for a Venus and a Mars mission are included.
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Propagation of radiation in astrophysical media: Gravitational lenses and astrophysical masers
… time dependent non-linear partial differential equations of radiative transfer through a masing gas. The calculations demonstrate for the first time how oscillations, with periods which are comparable to the light travel time through the maser, might develop as a result of radiative …
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The oxidation rates of arsenopyrite and chalcopyrite in acidic ferric chloride solutions at 0 to 60°C
The rates of oxidation of arsenopyrite and chalcopyrite by Fe³⁺ at concentrations of 10⁻² to 10⁻⁵ molal with a pH near 2 and temperatures of 0 to 60°C, conditions similar to those found in weathering sulfide ore deposits, have been determined. The rate equations for 25°C are: dn<sub>Fe</sub>3+/dt = …
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Characterization of VCSELs for Circuit Simulation
… surface emitting lasers (VCSELs) modeled by rate equations are emphasized. Measurements are used to determine the parameters of two specific rate equation models. The first model includes the nonlinear gain and carrier recombination characteristics. Rate equation parameters are extracted from …
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Halogen-induced modification of silicon surfaces: etching roughening, and step transformations
… that is accessed upon exposing nearly-saturated Cl-Si(100)-(2x1) to a flux of Cl2, whereby dangling bonds of the nearly-saturated surface mediate the insertion of Cl adsorbates into non-equilibrium adsorption sites. The adsorbates are kinetically trapped within these sites due to energy …
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Enhanced digital modulation of coherently coupled vertical cavity laser arrays: theory and application
… sources. An ideal laser source would have data-rates exceeding 100 Gb/s, energy-per-bit ratios reaching less than 1 pJ/bit, and be fabricated/integrated using conventional methods. In this dissertation, monolithic 2x1 mutually phase-locked 850 nm VCSEL arrays, based on ion-implantation and …
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The modelling of a falling sludge bed reactor using AQUASIM
… and biological sulfate reduction, to select rate equations from the literature that would simulate the various interactions taking place in the FSBR being fed a mixture of organic matter and acid mine drainage, and to investigate the trends obtained from the an AQUASIM model of the system. …
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Effects of a vibrationally excited gas on viscous shock-layer flows
… vibrationally excited gas results are more accurate than perfect gas, and computationally much faster than equilibrium. The vibrationally excited gas also shows potential for use in the nonequilibrium flow regime where the chemical reaction rates are too high for the "stiff" finite-rate …
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