Bulletin of the American Physical Society
2018 Joint Spring Meeting of the Texas Sections of APS, AAPT, and Zone 13 of the SPS
Volume 63, Number 8
Thursday–Saturday, March 22–24, 2018; Stephenville, Texas
Session C5: SPS Talks |
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Chair: Michael Hibbs, Tarleton State University Room: Science 105 |
Friday, March 23, 2018 2:30PM - 2:42PM |
C5.00001: The Twisted Future of Linear Actuators Michael Lynn By twisting common polymer fibers, like Nylon 6,6 into dense helix structures, a process known as super coiling, one can create a cheap, thermally driven, pliable, lightweight, compact, and long lived actuator. In PHASE I of the research at SFA, actuators were hand made by twisting fibers via stepper motor on a physics test stand. While multiple examples of TCPAs have been constructed using this technique, the process has proven to be difficult and inefficient. The constant breakage, ``birds nesting,'' and ``side coiling'' have proven that mass production or precision characterization of TCPAs will be impossible with the current fabrication techniques. The research team devised an automated muscle twister, employing a strain gauge, automatic PID twist control and micro-controller system, to untangle the problem of rapidly and precisely manufacturing TCPAs. The muscle twisting system was modeled in SolidWorks and its function simulated before manufacturing. The sub-assemblies, such as the right and left end plates, coiling carriage and motor mounts will be shown and a discussion of design and possible improvements will be provided. One of the major advantages of the system is the precise tuning of number of twists, tension, and final actuator length. As a result, rapid precision production of TCPAs to any desired specification can be performed at much greater speed. [Preview Abstract] |
Friday, March 23, 2018 2:42PM - 2:54PM |
C5.00002: A Photometric Study of Eclipsing Binary Stars Skyler Self, Chloe Lanning The changing brightness of an eclipsing binary star can reveal stellar properties such as mass, temperature, and luminosity. The targets of our research were the binary star systems V1073 Hercules and V0384 Serpentis. Multiband photometric observations were acquired in June 2016 and June 2017 using the 14-inch robotic Ritchey-Chretien telescope at the Waffelow Creek Observatory. Calibration of the images and ensemble photometry were performed using Mira software. The observations resulted in complete light curves for each star in three passbands: Sloan g', r' and i'. The light curves indicate both stars are W-type contact eclipsing binaries. New times of minima were determined and a period study performed. [Preview Abstract] |
Friday, March 23, 2018 2:54PM - 3:06PM |
C5.00003: Bragg's Law and Diffraction Linda Hughes A brief look into diffraction and how it produces Bragg's law. Application of Bragg's Law with respect to X-ray diffraction for three samples is shown and discussed. [Preview Abstract] |
Friday, March 23, 2018 3:06PM - 3:18PM |
C5.00004: Simulating the Precession of Venus Pradeep Ojha, Krista Chanaritthichai, Nathan Redmon, James Espinosa The orbit of Venus precesses at a total rate of 204 arc seconds per century. The gravitational forces from the other 7 planets produce a rate of 1075'' according to Newtonian gravity. In 1908, Walter Ritz published a modified law of gravity. We will use his theory to simulate the precession of Venus and demonstrate that his theory gives the correct amount. [Preview Abstract] |
Friday, March 23, 2018 3:18PM - 3:30PM |
C5.00005: Stable Orbits for Exomoons in Earth's Cousin (Kepler-452b) Orbiting a Sun-like Star Niyousha Davachi, Marialis Rosario-Franco, Sergio Garza, Zdzislaw Musielak Kepler 452b, also nicknamed Earth's cousin, was discovered orbiting the habitable zone (HZ) of a G2 Star (Jenkins et al. 2015). This exoplanet is considered a super Earth, with a mass of 5 \textpm 2 Mass of Earth and a radius of 1.11 Radius of Earth; and is arguably the first rocky, habitable exoplanet to orbit a sun-like star. With a period of 385 days, conditions are prompt to be similar to those of Earth, and while Kepler-452b orbits the HZ of its parent star, its habitability could also be affected by the presence of an exomoon. Motivated by the need to understand conditions of habitability and orbital stability of Kepler-45b, we have performed a series of N-body integrations to examine the possibility of the exoplanet hosting an exomoon(s). Our results give a range of physical parameters leading to stable orbits for exomoons around this habitable super Earth. [Preview Abstract] |
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