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 72 for “"Mixing Process"”.
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Quantum beat observations in rubidium vapor
… energy states were observed by a four-wave mixing process. The difference frequency between the 5D–5P_{3/2} and the 5P_{3/2}–5S transitions was also observed for interpulse delays up to 180 ps. The temporal evolution of the beat amplitude indicates the existence of a superfluorescent process …
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Modeling and Simulation of Large Scale Stirred Tank
… record of the evaluation performed on the DWPF mixing process by the construction of numerical models that resemble the geometry of this process. There were seven numerical models constructed to evaluate the DWPF mixing process and four pilot plants. The models were developed with Fluent …
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Ultrafast Dynamics and Nonlinear Interactions in Alkali Atoms and Diatomics
… atomic wavepackets interact with a four-wave mixing process in Rb and K to produce spatially and temporally coherent pulses of UV radiation. Wave packets are produced by coherently exciting an ensemble of states using the broad bandwidth of a femtosecond pulse. Oscillations corresponding to …
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Nonlinear optical effects in nematic liquid crystals
… liquid crystals including degenerate four-wave mixing are presented. The optically induced Freedericksz transition which is essential for these effects is also described. Experimental investigations are performed using a homeotropically aligned MBBA thin film. Good agreement is obtained between …
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Develop a Laboratory Mixing Procedure For Hot Mix Asphalt Containing RAP Materials
… primary objective of this study is to develop a mixing procedure for the laboratory that best simulates the plant-produced samples after their mixing and production process. Three distinct methods for incorporating the RAP material into the mixing process will be examined and compared to the …
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Characterization of Fluoropolymer Powders Made By Supercritical Assisted Mixing With Crystalline Additives
… impregnation by the additive. At the end of the mixing process, a free flowing powder is produced consisting of the additive coated with fluoropolymer. The additives were extracted from the powders and intrinsic viscosity measurements were done on the remnant fluoropolymer. Viscosity studies …
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Origin of geochemical heterogeneity in the mantle : constraints from volcanism associated with Hawaiian and Kerguelen mantle plumes
… information of mantle compositions and the processes that created the geochemical heterogeneity within the mantle. Kerguelen and Hawaii are two long-lived mantle plumes and lavas associated with them have very different geochemical characteristics. In this thesis I studied the geochemical …
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Computational fluid dynamics (CFD) and physical modelling of a metal refining process
Impeller-stirred mixing is one of the most important processes employed throughout the chemical, metallurgical and allied industries. The research reported in this thesis is focused on impeller stirred mixing associated with the refining of lead bullion. The aim of this process is to sequentially …
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A Study of Processing-Structure-Property Correlations in Novel Inorganic Phosphate Glass/Polyamide 66 Hybrid Materials with Enhanced Benefits
… be tailored because Pglass becomes liquid under processing conditions of the most plastic materials. Recent study found that polar thermoplastic polymers seem to have a good interaction with the Pglass. In this study, the Pglass was introduced into a commodity thermoplastic polymer matrix, …
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The brown muck of b^0 and b^0_s mixing: beyond the standard model
Standard Model contributions to neutral B meson mixing begin at the one loop level where they are further suppressed by a combination of the GIM mechanism and Cabibbo suppression. This combination makes B meson mixing a promising probe of new physics, where as yet undiscovered particles and/or …
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Application of the Vortex Fluid Device (VFD) in Polysulfone Synthesis and Ultra-filtration Membrane Fabrication for water treatment purposes
… membranes via controlling the fabrication process conditions as well as physical and/or chemical modification of the polymers used in membrane fabrication. The Vortex Fluid Device (VFD) is a newly invented platform which has found many applications in materials science and clean technology. …
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Mixing of Liquids in Large Tanks
A 1.2 m diameter tank has been used to model the mixing process in large storage tanks equipped with side-entry mixers.Terminal mixing times have been measured as a function of impeller speed, impeller diameter, liquid depth and impeller angle. it is shown that the indicator method for measuring …
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Jet mixing: the role of numerical flow visualization
… fluid. The extent to which this process occurs depends heavily upon the geometry of the shear layer, with an elliptical jet, for example, exhibiting much greater entrainment than a circular one. It was desired to characterize the entrainment process and to explore the means by …
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Measurement of Internal Movements of the Escherichia Coli Ribosome Using Forster Resonance Energy Transfer and Microsecond, Continuous -Flow Turbulent Mixing in Micro-Fabricated Devices
… of micro-fabricated, continuous-flow, turbulent mixing devices that can mix two or three fluids to complete homogeneity on the molecular scale in the microsecond range. The prototypical designs are compact, portable, simple to fabricate and consume smaller sample volumes than current technology. …
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Characterisation of turbulent mixing and its influence on antisolvent crystallisation
Mixing is a fundamental part of many processes in chemical engineering. In order for molecular processes to proceed there is an implicit requirement for molecular scale mixing. Many processes are so slow that they are effectively independent of mixing as mixing is fast relative to the process. …
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Emission characteristic of small diesel engine fuelled by preheat biodiesel
… atomization, vaporization and fuel–air mixing process, thus influencing the exhaust emissions and performance parameters of the engine. The higher viscosity has effect on combustion and proper mixing of fuel with air in the combustion chamber. The aim of this present research was to …
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CORRELATED PHOTON PAIRS AND MULTIPHOTON STATES FROM A COLD ATOMIC ENSEMBLE
… The source is based on a spontaneous four-wave mixing process implemented in a double-Λ energy-level configuration. By systematically varying the pump intensities, detunings, and optical depth, we optimized the photon-pair generation and demonstrated a tunable spectral bandwidth governed …
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Compressible Flow Analysis of Thrust Augmenting Ejectors
… augmenting characteristics of jet ejectors. The mixing process in ejectors can be analyzed using either the control volume approach, or detailed models based on the Navier -Stokes Equations and the theory of turbulent jets. The control volume approach uses integrated forms of the conservation …
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Experimental and Numerical Investigations into Terahertz Time-Domain Spectroscopy
… of the THz pulses generated from the optical mixing process of optical rectification. A numerical simulation based on the theory presented in this work helps present the physical intuition behind our use of these nonlinear optical processes and is furthermore used to complement our …
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Current velocity profiling from an autonomous underwater vehicle with the application of Kalman filtering
The thesis presents data processing schemes for extracting Earth-referenced current velocity from relative current velocity measurement made by an Acoustic Doppler Current Profiler (ADCP) borne by an Autonomous Underwater Vehicle (AUV). Compared with conventional approaches, current profiling from …
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