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Showing 1 to 20 of 73 for “"Rate equation"”.
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Development of a Flotation Rate Equation from First Principles under Turbulent Flow Conditions
A flotation model has been proposed that is applicable in a turbulent environment. It is the first turbulent model that takes into account hydrodynamics of the flotation cell as well as all relevant surface forces (van der Waals, electrostatic, and hydrophobic) by use of the Extended DLVO theory. …
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Experimental characterization of Cr4+:YAG passively Q-switched Cr:Nd:GSGG lasers and comparison with a simple rate equation model
… a study on the comparison and anlysis of a laser rate equation model and the laboratory performance of passively Q-switched microlasers. The laser rate equation model describes the development of a top hat gain distribution taking into account the excited state absorption of the passive Q-switch. …
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Deriving a rate equation for the removal of manganese from solution using a gas mixture of sulphur dioxide and oxygen
… oxygen gas mixture, a need arose to describe the rate at which the manganese is precipitated from solution, not in terms of the exact species responsible for the oxidation, but rather as a function of the easily measurable operating parameters. From the literature, the operating parameters …
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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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Coupled -Cavity Surface -Emitting Lasers: Modulation Concepts, Performance and Applications
… characteristics of the CRVCL are studied with rate-equation analysis. The rate-equation theory shows not only that the CRCVL can engineer and/or optimize the modulation response, but also that it has an inherent advantage in achieving higher modulation bandwidth than a conventional VCSEL. In …
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The effects of solution conditions on the kinetics of microbial ferrous-iron oxidation by Leptospirillum ferriphilum in continuous culture
… with a view to developing a comprehensive rate equation.
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Threshold current and modulation response of semiconductor lasers
… active region of quantum well lasers is demonstrated (in contrast to the usual presumption of charge neutrality in the region), and the resulting effect on the threshold current is examined. The investigations are performed with a simple rate equation simulator, as well as with a self-consistent …
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Temperature-Dependent High-Speed Modulation and Wavelength Conversion Using Quantum-Well Lasers
… study the cross-gain modulation response, a new rate equation model is developed for cross-gain modulation with an optical pump at 1.48 mum and 1.538 mum. Optical modulation experiments are performed to demonstrate the cross-gain modulation response, including pump-wavelength dependence and …
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An Ultrasonic Study of Impurity-Interstitial Complexes in Electron Irradiated Aluminum-Silicon and Aluminum-Silver
… II, of this defect species follows a first order rate equation which has a prefactor proportional to the solute concentration. The diaelastic effect associated with this defect is found to be comparable in magnitude and anisotropy to that attributed to -self interstitial dumbbells in pure …
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Understanding Allosteric Arginine Mutations Using Macromolecular Rate Theory
Enzyme catalysed reaction rates have been traditionally modelled with the Arrhenius and Eyring-Polanyi equations. These models assume that the reaction rate is exponential with temperature, and thus the natural log of the reaction rate versus 1/T is linear. Significant deviations from these models …
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An Optimal Pipe Replacement Scheduling Model for Water Distribution Systems
While the idea of critical break rate of water distribution pipeline (defined as the break rate after which it is no longer economical to continuously repair) has been accepted in the literature and among the practicing engineers, the formula to obtain the critical break rate has remained elusive. …
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Optical and Electrical Properties of Novel Quantum Dot Lasers and Amplifiers
… carrier redistribution with the coupled rate equation model is proposed to explain this unique optical gain evolution behavior. To experimentally demonstrate the proposed polarization-dependent photon-mediated carrier redistribution, the TE modal optical gain spectra of the tunneling …
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An ultrasonic study of impurity-interstitial complexes in electron irradiated Al-Si and Al-Ag
… II, of this defect species follows a first order rate -equation which has a prefactor proportional to the solute concentration. The diaelastic effect associated with this defect is found to be comparable in magnitude and anisotropy to that attributed to <100>-self interstitial dumbbells in pure …
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Modeling of gallium nitride molecular beam epitaxy growth
… these materials are incomplete. In this study, a rate equation approach is proposed based on physically sound surface processes to investigate the molecular beam epitaxy growth of GaN using ammonia and ECR plasma source. A surface riding layer of Ga and ammonia or N plasma species are included in …
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Density measurement of OH radicals in non-thermal plasmas by laser induced fluorescence and time-resolved absorption spectroscopy
… In addition, we have developed a new rate-equation model to rationalize LIF spectra, by taking into account the electronic quenching, the vibrational and rotational energy transfers, and the spatial profile of the laser beam. Finally, the electrical power dissipated in the discharge …
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Low-temperature molecular beam epitaxy of gallium arsenide Antisite incorporation and Rheed oscillations: A theoretical study
… (100) gallium arsenide (GaAs). A comprehensive rate equation model is proposed based on the presence and dynamics of a physisorbed arsenic (PA) riding the growth surface which dictates the incorporation and concentration of antisites and the RHEED oscillations (ROs) behavior. The dependence of …
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One-dimensional simulation of vertical-cavity surface-emitting lasers including energy transport
… simulator has been developed. The model incorporates drift-diffusion with carrier-capture and thermionic emission in the quantum regions. Microcavity effects on the stimulated and spontaneous emission are carefully included via the enhancement of the vacuum and radiating electromagnetic fields …
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Multiple thresholds and many-atom dynamics in the cavity QED microlaser
… and number of atoms. Data is compared with a rate equation model and fully quantized treatment based on micromaser theory. Good agreement between theory and experiment is found when the cavity is resonant with atoms of the most probable velocity, but long lifetimes of metastable states …
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Thixotropic-viscoelastic rheological fingerprints in large amplitude oscillatory shear
In this work we demonstrate the use of large-amplitude oscillatory shear (LAOS) as a tool to characterize the behavior of constitutive models that exhibit both thixotropic and viscoelastic phenomena. We demonstrate this use of LAOS by first examining the strain controlled LAOS (LAOStrain) response …
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Theoretical and experimental studies of optically pumped molecular gas lasers
… potentials for energy and power scaling. This rate equation model was applied to explore the performance of a second-overtone (pulsed) and a first-overtone (CW) pumped HBr laser. Experimental improvements concerning temperature spectral tuning and frequency stabilization of a Nd:YAG laser that …
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