Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 4 of 4
Full-Text Articles in Physics
Measurements Of Gravity Driven Granular Channel Flows, Kevin Facto
Measurements Of Gravity Driven Granular Channel Flows, Kevin Facto
Open Access Dissertations
This dissertation presents experiments that studied two gravity driven granular channel flows. The first experiment used magnetic resonance imaging to measure the density and displacement distributions of poppy seeds flowing in a rough walled channel. Time-averaged measurements of normalized velocity and density showed little flow speed dependence. Instantaneous measurements, however, showed marked velocity dependence in the displacement distributions. There was evidence of aperiodic starting and stopping at lower flow speeds and the onset of density waves on a continuous flow at higher speeds. The second experiment measured forces in all three spatial directions at the boundary of a flow of …
Capillary Interactions Among Microparticles And Nanoparticles At Fluid Interfaces, Chuan Zeng
Capillary Interactions Among Microparticles And Nanoparticles At Fluid Interfaces, Chuan Zeng
Open Access Dissertations
Particles can be adsorbed to liquid-fluid interface to minimize interfacial energy. The adsorbed particles interact in many ways. There has been a lot of theoretical predictions as well as experimental measurements of the interaction potential between particles confined at interfaces. Experimentally, we track multiple particles using optical microscope image processing of isolated pairs of particles and of more concentrated systems. Statistical methods were implemented to compute microparticle interaction forces from tracking data. The accuracy of different methods were tested with Monte Carlo simulation, which showed that care is needed to avoid artifacts. Our measurements confirmed the absence of significant pair-interactions …
Search For Contact Interactions With Dimuons At The Atlas Detector, Emily Thompson
Search For Contact Interactions With Dimuons At The Atlas Detector, Emily Thompson
Open Access Dissertations
The Standard Model has been very successful over the last few decades in its agreement with experimental evidence; however there are some remaining puzzles in our understanding of the Universe which have yet to be solved. Even if the Higgs boson and Super Symmetry are discovered, questions still arise, such as why Nature is primarily made of matter when antimatter should have been produced in equal amounts at the beginning of the Universe, why the fundamental particles have the mass hierarchy that they do, what the nature of dark matter is, or whether or not quarks and leptons are themselves …
Experiments And Simulations On Granular Gases, Hongqiang Wang
Experiments And Simulations On Granular Gases, Hongqiang Wang
Open Access Dissertations
In this thesis we report experimental and simulation study of granular gases. As a non-equilibrium system composed of macroscopic particles, a granular gas often shows a picture similar to a molecular gas in that the system is dilute and particles interact with each other through instantaneous collisions. Unlike in molecular gases, the collisions are inelastic so that the interactions are a continuous sink of kinetic energy. The study of granular gases is not only of theoretical interest as an important example of non-equilibrium physics, but also of practical value since granular materials play an important role in many industrial processes …