Bulletin of the American Physical Society
Joint Fall 2017 Meeting of the Texas Section of the APS, Texas Section of the AAPT, and Zone 13 of the Society of Physics Students
Volume 62, Number 16
Friday–Saturday, October 20–21, 2017; The University of Texas at Dallas, Richardson, Texas
Session N8: SPS III |
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Chair: Bob Glosser, University of Texas at Dallas Room: JSOM 1.212 |
Saturday, October 21, 2017 2:30PM - 2:42PM |
N8.00001: Demonstrating Transitions between Chaos and Order in Chua's Circuit Edward Hamilton, Luke Grosh Chua's circuit and the associated equation have been widely studied as a model for chaotic dynamics since their introduction in 1983. Since this circuit uses only inexpensive electronic components common in an undergraduate laboratory, it serves as an appealing introduction to the emergence of nonlinear dynamics out of a system of coupled differential equations. We constructed a Chua circuit using op-amps and resistors, and then modeled the associated behavior using computer code over a wide range of parameter space. This talk will both present the experimental circuit itself, with the intent of promoting greater use of this as an undergraduate demonstration system for nonlinear electronics, and will also explore interesting regions of the parameter space of computational results. In particular, since the numerical implementation allows for effectively infinite resolution of the physical observables, it becomes possible to demonstrate effectively fractal behavior in certain parameter regimes. [Preview Abstract] |
Saturday, October 21, 2017 2:42PM - 2:54PM |
N8.00002: Comparing models with new data sets Craig Nakutis Cosmology seeks to find an understanding for the dynamical accelerated expansion of the universe. In order to help understand the universe a proper model must be found that matches the current observable data. For this report, the models tested were $\omega$CDM, CPL parameterization, Modified Polytropic Cardassian, and Slow roll dark energy. These models were tested using \texttt{cosmoMC} with data from the latest cosmic microwave background measurement of the Planck satellite, baryon acoustic oscillations, supernovae type Ia, Hubble Parameter H(z) measurements, and redshift space distortions that could be found. The results will be compared to the accepted $\Lambda$CDM to check for a better fit to the observed data. [Preview Abstract] |
Saturday, October 21, 2017 2:54PM - 3:06PM |
N8.00003: Investigation of Multilayers for Magnetic Thermometry using Micro-Magnetic Computer Simulations Nicholas Terranova No reliable method exists for measuring temperature variations throughout a volume. A possible solution to this problem, bi-magnetic nanoparticles, requires the development of new material systems which have a strong dependence of magnetic behavior on temperature. This study tests the viability of using iron and gadolinium multilayers as sensitive thermometers for monitoring small regions via the simulation of Fe/Gd thin films.The modeling software known as the Object Oriented Micro-Magnetic Framework (OOMMF) was used to simulate the change in magnetization (M) of Fe/Gd multilayers with a change in applied magnetic field (H). We determined the optimal parameters for simulation of the magnetization of 4x4 mm samples of single-layer and multilayer thin films.For the simulated multilayer samples, the negative interfacial exchange interaction between the layers produced secondary features in the M vs. H curves. Spatial variations of magnetization in the simulation results show that the Fe/Gd interface is key to the M vs. H behavior. Simulation results were compared with M vs. H curves measured experimentally.Our study has helped identify promising configurations for fabricating additional thin films and nanoparticles with strongly temperature-dependent magnetization. [Preview Abstract] |
Saturday, October 21, 2017 3:06PM - 3:18PM |
N8.00004: Electric Field Simulations for Proto-DUNE Field Cage Components Mathew Rapp The Deep Underground Neutrino Expirement (DUNE) is an international project hosted by Fermilab. The objective of DUNE is to study neutrino oscillation properties, as well as the 40kt Liquid Argon Time Projection Chamber (LArTPC). There are two current prototypes of the LArTPC which are being prepared for testing at CERN. The LArTPC requires a uniform electric field within its active volume. This field is provided by the field cage, a cubic structure composed of insulative I-beams that support 98 aluminum profile rings. The properties of specific field cage components that have been manufactured can cause undesired changes in the electric field. To better understand how flaws on specific field cage components affect the electric field, simulations are conducted. The purpose of simulating the flaws is to understand how the active electric field can be affected, and identify any critical flaws in manufactured parts. [Preview Abstract] |
Saturday, October 21, 2017 3:18PM - 3:30PM |
N8.00005: Investigation of Profiles Scales in Reducing the Uncertainty in the Theoretical Predictions of Thrust Campbell Saint-Vincent, Calvin Berggren Investigation into particle collisions provides insight into the building blocks of nature. Many interesting observables arise from these collisions. Quantum field theory (QFT) calculations are used to make theoretical predictions for these observables. Significant uncertainty in the prediction of the observables is produced from the QFT calculation, however. In this work, novel methods are employed to improve uncertainty in the theoretical predictions. [Preview Abstract] |
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