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 74 for “"Particle trajectories"”.
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Hidden Markov model analysis of subcellular particle trajectories
How do proteins, vesicles, or other particles within a cell move? Do they diffuse randomly or ow in a particular direction? Understanding how subcellular particles move in a cell will reveal fundamental principles of cell biology and biochemistry, and is a necessary prerequisite to synthetically …
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Investigation of Particle Trajectories for Wall Bounded Turbulent Two-Phase Flows
… more than 40 years of research, operation with a particle-laden inlet flow remains a significant problem for modern turbomachines. The purpose, therefore, is to develop experimental methods for investigating multi-phase flows relevant to the cooling of gas turbine components. Initially, several …
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Investigation of Particle Trajectories in the Near-Earth Night-Side Magnetosphere Using Riometers
… historically been studied primarily by data from particle detectors on satellites, causing gaps in our knowledge because these events are spatially large and highly structured and satellites provide only point measurements. It has been shown that injections can be identified in ground-based …
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Quantifying particle sorting in microbubble streaming flows
… and model the size-dependent behaviour of microparticles in a bubble streaming flow. We show that in microchannels, the steady streaming flow generated by an ultrasonically driven semicylindrical microbubble can be combined with a Poiseuille flow to achieve tunable, high throughput, …
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A Computational Framework for Dimensionally Reduced Particle Dynamics in Magnetic Nozzle Fields: An Adiabatic Invariant Approach
… reduction strategy for modeling charged particle trajectories in electromagnetic fields representative of magnetic nozzle expansion regions. By employing Julia’s DifferentialEquations.jl and Python’s scientific libraries, particle trajectories are integrated with high precision (achieving …
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Numerical models for rotating Lagrangian particles in turbulent flows
… dissertation introduces high fidelity Lagrangian particle models to account for the rotational effects of particles in complex turbulent flows. Part of the focus of the research is to provide novel techniques to model particle-surface collision induced rotation as well as develop correlations for …
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Numerical and Experimental Study of Volumetric Particle Tracking Velocimetry in a Spatial and Temporal Domain
… for the purpose of demonstration. Fluorescent particles were employed to trace the fluid motion. An argon-iron laser was employed as the illumination system. The tube is immersed in a water tank to compensate for the light refraction occurring at the tube boundary. A method was proposed to …
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Solids motion in fluidised beds of fine particles
… for the past 70 years, the interaction between particles and rising bubbles and the general solids motion in bubbling fluidised beds are still not fully understood. The work presented in this thesis uses the method known as Positron Emission Particle Tracking (PEPT) to track the motion of a …
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Study of the dynamics of transport and mixing using set oriented methods
… in flows where turbulence is absent, if the trajectories of passively advected particles in the flow are chaotic. The chaotic nature of particle trajectories results in exponential stretching of material lines in the flow. Thus the interface along which diffusion occurs is stretched …
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Validation and Characterization of a Laboratory Ion Source for Testing Thermal Space-Plasma Instruments
… simulations of the potentials and charged particle trajectories in and around the source, and vacuum chamber measurements of the emitted ion beam. Once the ion source is understood, it is successfully used to test a typical ion instrument. Further aspects of the ion source, efficiency, …
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Long-range video motion estimation using point trajectories
… in which motion is represented using a set of particles. Each particle is an image point sample with a long-duration trajectory and other properties. To optimize these particles, we measure point-based matching along the particle trajectories and distortion between the particles. The resulting …
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On Steady Water Waves and Their Properties
… waves with vorticity: rotational features and particle paths. Steady linear gravity waves of small amplitude travelling on a current of constant vorticity are found. For negative vorticity we show the appearance of internal waves and vortices, wherein the particle trajectories are not any more …
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Tools for electromagnetic field simulation in the KATRIN experiment
… defined electric and magnetic fields for particle transport and mass spectroscopy. In order to simulate particle trajectories in the experiment, it is essential to have methods for calculating these fields quickly and accurately. The application of the methods of direct elliptic integral …
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Magnetic Field Shielding For the Forward Time of Flight Upgrade At Jefferson National Lab
… varying lengths, record the time of flight for particles inside the Continuous Electron Beam Accelerator Facility (CEBAF) Large Acceptance Spectrometer (CLAS). These detectors must be properly shielded from magnetic fields used in the manipulation of the particle trajectories during experiments. …
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Particle manipulation by attractive and repulsive forces in 2-D streaming flows
… to study the variation in the trajectory of microparticles as they move in flows which are characterized by the superposition of microbubble streaming and transport flows. Our experimental setup uses steady streaming flow generated by ultrasonically driven semi-cylindrical microbubble combined …
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Instability Waves in the Gulf Stream Front and Its Thermocline Layer
… to those observed. The eigenfunctions and particle trajectories reveal large cross-frontal excursions in the thermocline layer, and a large, if weak, cyclonic eddy in the surface slopewater in a meander trough.</p>
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Three-dimensional particle tracking velocimetry study of marine organism wake behavior
Three-dimensional particle tracking velocimetry (3D-PTV) is a flow measurement technique that tracks Lagrangian trajectories of passive tracer particles using stereoscopic imaging. The technique allows for detailed analysis of the velocities along particle trajectories in unsteady flows. The …
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Microfluidic Transverse AC Electrophoresis Systems for Multiparameter Characterization of Single Particles and Cells
Particle characterization techniques are essential in a wide range of fields, including biological sciences, material science, environmental studies, pharmaceutical, and clinical research. Despite the availability of numerous characterization methods, spanning both ensemble and single particle …
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Simulations of Nanoparticle Synthesis in Laminar Stagnation Flames
… of a multidimensional solver for studying nanoparticle synthesis in laminar flames is presented. The governing equations are convective-diffusive-reactive partial differential equations that are discretised using the finite volume method. Detailed chemical source terms and transport …
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Lagrangian techniques for particle flux and concentration
… new technique is proposed for computing Eulerian particle concentration and fluxes based on Lagrangian particle trajectories. In particular, a Lagrangian concentration differential equation is solved along a particle path using Eulerian derivatives for the particle velocity divergence field. This …
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