Bulletin of the American Physical Society
2017 Annual Spring Meeting of the APS Ohio-Region Section
Volume 62, Number 6
Friday–Saturday, May 5–6, 2017; Ypsilanti, Michigan
Session B2: Contributed Posters: Applied and Computational Physics, Materials Science, and Soft Matter |
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Chair: Jonathan Skuza, Eastern Michigan University Room: Pray-Harrold 203 |
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B2.00001: The Study of Zinc Tin Nitride for Possible Thermoelectric and Photovoltaic Applications John W. Cenker, Jeffrey S. Dyck, Robert A. Makin, Nathaniel Feldberg, Steven M. Durbin Zinc Tin Nitride (ZnSnN$_{\mathrm{2}})$ is the II-IV-V$_{\mathrm{2}}$ semiconductor analog to the III-V semiconductor Indium Nitride (InN), and the two are predicted to have similar properties that make them attractive for thermoelectric and photovoltaic applications. Replacing the costly and rare indium with more Earth-abundant and inexpensive zinc and tin makes ZnSnN$_{\mathrm{2}}$ a potentially valuable alternative to InN. In this work, temperature dependence of Seebeck coefficient, Hall coefficient, and electrical resistivity were measured in a range of 7-300K. The Hall and resistivity measurements enabled the determination of Hall mobility and carrier concentration. Using the solutions to the Boltzmann transport equations in the relaxation time approximation and assuming a parabolic band, bounds on density of states effective mass are determined corresponding to different possible electron scattering mechanisms. The results show that samples with carrier concentrations in the narrow range 6-9\texttimes 10$^{\mathrm{19}}$ cm$^{\mathrm{-3}}$ are consistent with the model, but not samples with a higher concentration of 1\texttimes 10$^{\mathrm{21}}$ cm$^{\mathrm{-3}}$. [Preview Abstract] |
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B2.00002: Developing an Opyical System for Laser Tattoo Removal Alexandra Montesano, Silas Ifeanyi, Peifang Tian Tattoo removal is a big market in the US. Doctors choose a laser with the peak wavelength matching the color of the tattoo; use it to locally heat the tattoo, breaking it into small pieces and then removing from the skin. However, tattoos of the same color may have very different absorption peaks, thus using visual inspection to determine the optimal wavelength sometimes fails to work. We developed an optical reflectance spectroscopic system to detect the peak absorption wavelength in 2015. Here, we reduced the footprint of the system making it portable and controllable with a smartphone. The absorption peaks obtained from the portable system are consistent with those from 2015. The next step is to test human subjects to see if real skin produces similar data to the phantoms. [Preview Abstract] |
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B2.00003: The Concept Of Metastability For One-Legged Standing Ulrich Zurcher, Neal Carr, Lauren Moore, Paul Sung Standing on one foot has been characterized by a continuum between static equilibrium (standing) and dynamic equilibrium (walking). This suggests that sways of the body are important for a person to maintain the upright position and prevent a fall. We examine the center of pressure (COP) changes with and without visual input, and find that the character of the COP dynamics is different on different timescales; it is random (stochastic) on short timescales ($0< t< 20 \, \mbox{ms}$), ballistic (deterministic) on intermediate timescales ($20 \, \mbox{ms} < t < 200 \, \mbox{ms}$), and random on long timescales. [Preview Abstract] |
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B2.00004: Embryonic metabolism in ornithischian dinosaurs and implications for calculations of dinosaur egg incubation times. Scott Lee The embryonic metabolisms of the ornithischian dinosaurs \textit{Protoceratops andrewsi} and \textit{Hypacrosaurus stebingeri} have been determined and are in the range observed in extant reptiles. The average value of the measured embryonic metabolic rates for \textit{P. andrewsi} and \textit{H. stebingeri} are then used to calculate the incubation times for twenty-one dinosaurs from both Sauischia and Ornithischia using a mass growth model based on conservation of energy. The calculated incubation times vary from about 70 days for \textit{Archaeopteryx lithographica} to about 180 days for \textit{Alamosaurus sanjuanensis}. Such long incubation times seem unlikely, particularly for the sauropods and large theropods. Incubation times are also predicted with the assumption that the saurischian dinosaurs had embryonic metabolisms in the range observed in extant birds. [Preview Abstract] |
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B2.00005: Analysis of the Sensitivity of Mars's Neutral Atmosphere in Response to Solar Input Matthew Burton NASA’s MAVEN mission has been studying the upper atmosphere of Mars and its evolution for the past two years. The focus of this research is on using MAVEN data to better understand how solar activity affects the atmospheric density. Solar input is thought to be the primary driver of the variation in the upper atmosphere. However, with locally dependent variation due to day/night effects, lower atmospheric driving, and other phenomena, we are interested in what time periods the solar input does, in fact, have the strongest effect. We present initial results which show there are time periods when a strong correlation between solar input and density exists but there were also many time periods with no correlation, indicating something else was the primary driver of density variation. [Preview Abstract] |
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B2.00006: The External Field Effect on Milky Way Dwarf Spheroidal Galaxies Benjamin Blankartz, Justin Messinger, Joshua Schussler, Stephen Alexander MOdified Newtonian Dynamics is an alternative to the dark matter paradigm which can be used to explain the missing mass problem. The External Field Effect is a feature unique to MOND that has no counterpart in the dark matter paradigm. The EFE comes about when a gravitationally bound system is under the influence of an external gravitational field. We embed several Milky Way dwarf spheroidal galaxies in an external field similar to what they would feel from their host galaxy, the Milky Way. We then calculate the time evolution of the stellar motion under the effects of MOND as well as the EFE. The dispersion profiles are calculated statistically and then compared to observational data and a best fit is estimated. [Preview Abstract] |
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