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 26 for “"mixing times"”.
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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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Integral geometry, Hamiltonian dynamics, and Markov Chain Monte Carlo
… demanding situations, since their mixing times need not grow exponentially with the dimension of [pi]. However, if [pi] has many modes, MCMC algorithms may still have very long mixing times. It is therefore crucial to understand and reduce MCMC mixing times, and there is currently a …
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A novel reactor with two independently-driven impellers for gas-liquid processing
… to fully characterise the system, important mixing aspects such as mass transfer (hold-up, k\(_L\)a) and bulk blending (mixing times, circulation time distributions) were investigated and related to the power input from each impeller. At low gas rates, moderately increased hold-up and …
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Introduction to the Glauber dynamics for the Curie-Weiss Potts model
… their convergence behavior and related mixing times. Furthermore, special emphasis is placed on a consistent and comprehensive presentation of the Curie-Weiss Potts model and its analysis. Finally, the Glauber dynamics is studied in general and applied afterwards in an exemplary way to …
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Comparative Analysis of Geometric Random Walks for Sampling in High-Dimensional Convex Polytopes
… διατριβή εστιάζει στη σύγκριση των χρόνων μίξης (mixing times) και της συνολικής χρονικής αποδοτικότητας (time efficiency) των αλγορίθμων. Τα αποτελέσματα καταδεικνύουν ρητά ότι, στην πράξη, οι αλγόριθμοι αυτοί επιτυγχάνουν ταχύτερη παραγωγή ανεξάρτητων δειγμάτων σε σχέση με τις ιδιαίτερα …
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Characterization of mixing in a coaxial jet mixer for nanoparticle fabrication
Mixing in a micro-scale coaxial turbulent jet mixer for the fabrication of nanoparticles for drug delivery was experimentally characterized. Rapid mixing due to turbulence offers improved control of nanoparticle production over conventional bulk nanoprecipitation methods. Mixing time was determined …
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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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Spin dynamics in solids
… calculation and experiment for relatively small mixing times. Motional averaging of 13C- 1H dipolar coupling is found to be responsible for the unusually efficient 13C spin-diffusion in adamantane. Further enhancement of 13C spin-diffusion should be possible by carrying out mixing in the rotating …
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Design of the aerobic hail reactor - towards improved energy efficiency
… can attain high mass transfer rates and short mixing times; however, their energy efficiency remains a concern. Many studies have attempted to further optimise these reactors, but they are ultimately limited by their high aspect ratios. These lead to large pressure heads that the air compressor …
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Universality of Cutoff for Random Walks on Random Cayley Graphs
… T(k, |G|) was shown to be an upper bound on mixing for arbitrary groups. First we extend the conjecture to 1 ≪ k ≲ log |G|. Write d(G) for the minimal size of a generating set of G. We establish cutoff (for the random walk on) all Abelian group under the condition k - d(G) ≫ 1, verifying the …
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In situ observation of the distribution and location of gliadin as a function of mixing time in wheat flour dough using quantum dots
… and location of gliadins as a function of mixing time in model wheat flour dough were investigated for the first time using confocal laser scanning microscopy. In this research we tagged gliadin proteins with Quantum Dots (QDs) to increase the clarity and specificity of imaging and then …
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Influences of the internal residual on combustion instabilities in the misfire and partial burn regimes of a dilute spark-ignition engine
… model that accounts for both chemical and mixing times along with residual effects was used to see if the complex dynamics seen experimentally could be captured. Results showed the model was capable of capturing differences between regimes, but was unable to capture the complexity of the …
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Low-dimensional Models for Real-time Simulation of Internal Combustion Engines and Catalytic After-treatment Systems
… differential equation model is based on two mixing times that capture the reactant diffusional limitations inside the cylinder and mixing limitations caused by the input and exit stream distribution. For given fuel inlet conditions, the model predicts the exhaust composition of regulated …
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Scale-up of oscillatory flow mixing
Oscillatory Flow Mixing is a recent development in mixing technology which has evolved over the past decade. It has a number of similarities to other mixing technologies, particularly pulsed and reciprocating plate columns, but at the laboratory scale has demonstrated a number of advantageous …
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Evaluating the combined use of three-dimensional hydrodynamic modeling and polyethylene passive sampling in the Lower Duwamish Waterway
… and freshwater downstream, influencing residence times, mixing times, and the resulting concentration distributions of potential sources. The dependence of simulated, unit strength concentration distributions on source location was evaluated by spatially comparing EFDC-simulated sources introduced …
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Novel methods for manipulating ion types in the solution and gas phases for the structural analysis of biomolecules using Mass Spectrometry
… capillaries. These nESI emitters enable the mixing of two solutions as they are sprayed into the mass spectrometer. This technique has been used to manipulate protein charge states (i.e. protein folding and unfolding) and to demonstrate peptide/protein analyte-reagent complex formation and …
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Using Nd Isotopes to understand changes in continental weathering flux in Mid-Pennsylvanian (Desmoinesian) carbonate cycles
… its short residence time (less than ocean mixing times). This study focuses on cyclic Middle Pennsylvanian (Desmoinesian) marine successions from the Pedregosa (Arizona) and Bird Spring (southern Nevada) basin to address the interbasin and intrabasin response of Nd. Two types of …
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Experimental investigation of mixing time in a stirred, torispherical-bottomed tank equipped with a retreat-blade impeller
… tank a single baffle mounted from the top. The mixing performance of such reactors has not received significant attention in the literature, despite their ubiquitous presence in the pharmaceutical industry. In particular, mixing time, i.e., the time required by the system to achieve a predefined …
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Finite Sample Bounds and Path Selection for Sequential Monte Carlo
… of SMC interpolating distributions and the warm mixing times of the Markov kernels, explicitly relating the algorithmic choices to the error of the SMC estimate. This allows us to provide finite-sample complexity bounds for SMC in a variety of settings, including finite state-spaces, product …
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Enhanced anaerobic digestion of combined wastewater sludges through solubilization of waste activated sludge
… hydroxide and sodium hydroxide and mechanical mixing times for waste activated sludge (WAS) solubilization; the second, pilot-scale phase monitored the performance of anaerobic digestion, using mixtures of solubilized WAS and primary sludge as a feed. The first phase results showed that …
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