Bulletin of the American Physical Society
2014 Annual Fall Meeting of the APS Prairie Section
Volume 59, Number 19
Friday–Saturday, November 21–22, 2014; Monmouth, Illinois
Session AB1: Interdisciplinary |
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Chair: Timothy Stiles, Monmouth College Room: CSB 100 - Pattee |
Saturday, November 22, 2014 8:00AM - 8:36AM |
AB1.00001: Super-Resolved Microscopy: Brief History and Recent Results Invited Speaker: Kishor T. Kapale |
Saturday, November 22, 2014 8:36AM - 8:48AM |
AB1.00002: Experimental investigation of the Malkus-Lorenz waterwheel George Rutherford, Richard Martin The Malkus waterwheel is well-known as a simple mechanical system that can exhibit chaotic behavior. Our experimental version of this wheel consists of 36 cylindrical cells placed around the edge of the tilted wheel. Water leaks from each cell through a long outlet of small diameter. A thin aluminum ring at the periphery of the wheel passes through variable gap magnets, allowing for adjustable eddy-current braking that is used as the control parameter. We acquire angular time series data with a rotary encoder, and we then smooth the data and calculate angular velocity and acceleration using Fourier transforms. Experimental results are compared with a model by Strogatz, and significant differences will be discussed. We will also show the results of the application of Gottwald's 0-1 test for chaos to the data, which indicate that all data at brake strengths higher than the period doubling cascade are chaotic. Preliminary data will also be presented that indicate that the total mass of water in the wheel does not approach a constant as assumed in the model. [Preview Abstract] |
Saturday, November 22, 2014 8:48AM - 9:00AM |
AB1.00003: Exact solution to kinetic Monte Carlo simulations and its application to energy materials Angel Yanguas-Gil In many circumstances kinetic Monte Carlo simulations are used to determine the probabilistic outcome of a process. However, one of the challenges of this method is the need to accumulate enough statistics to reduce errors to a manageable level. Here we show how for this set of problems it is possible to formally extract the exact solution for the probabilistic outcome of a kinetic Monte Carlo process by presenting the kinetic Monte Carlo problem in terms of a master equation. This reduces the solution method to the inversion of a single sparse matrix, from which all the relevant data can be extracted. We have applied this method to tackle two cross-cutting problems in the area of energy applications: the simulation of particle-surface interaction during wide band gap semiconductor epitaxy and the transport of charged species in nanostructured electrodes. [Preview Abstract] |
Saturday, November 22, 2014 9:00AM - 9:12AM |
AB1.00004: Analysis of gravity wave perturbations observed in the centroid profiles of polar mesospheric clouds during tomographic reconstruction of AIM satellite imagery Vern Hart, Michael Taylor, Timothy Doyle, Yucheng Zhao NASA's Aeronomy of Ice in the Mesosphere (AIM) satellite is the first with a sole commission of studying polar mesospheric clouds (PMCs). These clouds, which are being observed with increasing frequency, are of interest due to their sensitivity to climate changes. Three-dimensional (3D) tomographic reconstructions of PMCs will be presented which were rendered from a series of AIM satellite images. An intensity-weighted centroid was calculated to form surface plots showing altitude variability of the mean albedo. Evident in these plots were coherent wave fronts propagating through the layer, suggesting the presence of gravity wave perturbations in the data. FFT analysis was performed and results showed a strong contribution from $\sim $60-90km wavelengths. It was also found that high centroid altitudes generally corresponded well with low-intensity regions in the albedo images. This correlation indicates that the presented method could be applied to particle size investigations as denser particles are found at lower altitudes and scatter light more strongly than lighter particles. Results from five different AIM orbits will be presented and discussed as they apply to investigating wave-induced dynamics when resolution is limited. [Preview Abstract] |
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