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 67 for “"Particle distribution"”.
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A high-order Legendre-WENO numerical scheme for the non-conservative kernel density equations modeling particle-laden flows
… integrate the kernel density equations for the particle phase of disperse flows. The kernel density equations arise from least squares minimization of the approximation of the position-velocity phase-space particle distribution by a sum of kernel density functions. For concreteness in this work, …
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Controlled formation of nanostructures with desired geometries : robust dynamic paths to robust desired structures
… of the nanoscale constituents, driven by interparticle interactions (short- and long-range) and interactions with the external controls (e.g., electrical, magnetic, chemical). The desired nanoscale structure must be locally stable and robust to a desired level of robustness, and it should be …
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Die Fragmentierung hochviskoser Magmen
… experiments permit analysis of the primary particle distribution above the fragmentation level of an eruption. Further analyses were aimed at the influence of crystals on the particle distribution. An experimental set-up was used to investigate the speed of the propagating fragmentation …
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Inverse problems in elliptic charged-particle beams
… for the design of elliptic cross-section charged-particle beam formation and transport systems. An effective mathematical formalism for describing accelerating elliptic cross-section beams is developed in which the particle distribution function for an elliptic beam is associated with a …
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Simulation studies of Brownian motors
… ratchet rectifies the motion of diffusive particles using a time dependent, asymmetric potential energy landscape, and the transport speed of the ratchet can be increased if information about the particle distribution is incorporated as feedback in the time dependency of the landscape. …
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An experimental study of solid propellant deflagration using high speed motion pictures and postfire residue analysis
… bomb at 500 psi and 1000 psi. Postfire particle residues were analyzed with a scanning electron microscope and found to have bi-modal size distributions. The mean diameter of the fine particle distribution was approximately 10um in all cases while the mean diameters of the coarse …
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Stabilizing energy reconstructions of the surface detector at the Pierre Auger Observatory
… are empirical approximations of the true particle distribution and thus, different models should return similar energy reconstructions. However, differing models, particularly at high energies and low zenith angles, do not yield the same energy. The focus of this thesis is to remedy these …
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Quantum electrodynamic model for production amplitudes at infinite momentum
… sections generated by these diagrams. The number distribution P(n), the average number of pairs produced, the,two particle and one particle momentum distributions and the total cross section are obtainec1,. The two particle distribution is expressed in terms of the invariant, mass, total …
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DYNAMICAL TESTS OF A PARTICLE-MESH COMPUTER SIMULATION MODEL WITH APPLICATIONS IN ASTROPHYSICS
The theory of Particle-Mesh simulation of astrophysical systems is presented in the first three chapters. Chapter 4 contains the results of extensive tests of our two-dimensional computer model on a circular binary system. These tests assisted us in obtaining the best mix of parameters, …
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Magnetohydrodynamic turbulence: The development of lattice Boltzmann methods for dissipative systems
… of the Boltzmann equation to temporally evolve particle distribution functions on a discrete spatial lattice. We will begin with a development of LBMs from basic kinetic theory and will then show how one can construct LBMs to model incompressible resistive magnetohydrodynamic (MHD) conservation …
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Modeling Magnetic Field Amplification in Nonlinear Diffusive Shock Acceleration
… to efficient shock acceleration of charged particles. Based on a Monte Carlo simulation of particle transport and acceleration in nonlinear shocks, the model describes magnetic field amplification using the state-of-the-art analytic models of instabilities in magnetized plasmas in the …
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Hydrodynamic Focused Passive Separation Under Continuous Flow in a Microfluidic Chip
… sample inlet connection into the reservoir, the particle position was influenced significantly, which enabled desired separations. Additionally it was noted that the relative, horizontal position of the inlet also had a significant influence on particle position within the device. A dimensionless …
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Effects of buoyancy source composition on multiphase plume behavior in stratification
… of the initial buoyancy flux can be dense brine, particles, or a mixture of the two in a prescribed ratio. The resulting trapping heights and peeling depths are recorded by visual acquisition and from dye fluorescence measurements. Also, the radial concentration distribution of the dispersed phase …
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Effect of mobile phase additives on linearity in particle beam lc/ms
Although Particle Beam Liquid Chromatography/Mass Spectrometry (PB LC/MS) has been shown to be useful for the identification and confirmation of nonvolatile and thermally labile compounds, evidence has been reported of response nonlinearity at low concentrations. Addition of a mobile phase additive …
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The Effects of Vertical Diel Thermocline Movement on the Settling of Marine Snow in a River Influenced Marine Environment
… water column in marine snow settling processes, particle distribution data from 15 marine snow camera casts were analyzed to examine variations in aggregate abundance, ellipsoidal volume, and particle elongation with depth. Data were collected during two cruises aboard R/V Endeavor in the Gulf of …
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Fully-kinetic PIC simulations for Hall-effect thrusters
… was predicated upon the notion that the energy distributions of the various species remained Maxwellian at all times. The next generation of simulations used the fully-kinetic particle-in-cell (PIC) model. Although much more computationally expensive than the fluid codes, the full-PIC codes …
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Stereological techniques for synthesizing solid textures from images of aggregate materials
… techniques to independently solve for the shape, distribution, and color of the embedded particles, as well as the residual noise. To approximate particle shape, I consider four methods-including two algorithms of my own contribution. I compare these methods under a variety of input conditions …
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Sedimentation in a stratified ambient
We study the interaction between settling particles and a stratified ambient in a variety of contexts. We first study the generation of large scale fluid motions by the localised release of a finite mass of particles in the form of plumes or gravity currents. We present the results of a combined …
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Scalable parallel simulation of small-scale structures in cold dark matter
We present a parallel implementation of the particle-particle/particle-mesh (P³M) algorithm for distributed memory clusters. The llp3m-hc code uses a hybrid method for both computation and domain decomposition. Long-range forces are computed using a Fourier transform gravity solver on a regular …
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Advances in fully-kinetic PIC simulations of near-vacuum Hall thruster and other plasma systems
… was predicated upon the notion that the energy distributions of the various species remained Maxwellian at all times. The next generation of simulations used the fully-kinetic particle-in-cell (PIC) model. Although much more computationally expensive than the fluid codes, the full-PIC codes …
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