Bulletin of the American Physical Society
Joint Fall 2021 Meeting of the Texas Sections of APS, AAPT, and SPS
Volume 66, Number 10
Thursday–Saturday, October 21–23, 2021; Houston; Central Time
Session T04: SPS,General Physics & Physics Education II |
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Chair: James Clarage, University of St. Thomas Room: STEM 3133 |
Saturday, October 23, 2021 10:00AM - 10:12AM |
T04.00001: A Big Data Analysis display tool for teaching undergraduate research. Muhammad Saleem In the era of Big Data, with the increasing use of large-scale data-driven applications, visualization of very large high-resolution images and extracting useful information searching for specific targets or rare signal events) from these images can pose challenges the current display wall technologies. At Bellarmine University, we have set an Advanced Visualization and Computational Lab using a state-of-the-art next display wall technology, called Hiperwall (Highly Interactive Parallelized Display Wall). The 16 ft x 4.5 ft Hiperwall visualization system has a total resolution of 16.5(MP) which consists of eight display-tiles that are arranged in a 4 x 2 tile. This system can perform interactive visual data analytics of large by comparative views of multiple large images in Astronomy and event displays in experimental High Energy Physics. Users can display a single image across all the display-tiles, or view many different images simultaneously multiple display tiles. Hiperwall enables simultaneous visualization of multiple high images and their contents on the entire display wall without loss of clarity and. Hiperwall's middleware also allows researchers geographically diverse to collaborate on large scientific experiments. This setup provides a new generation of display wall setup and is based on the Hiperwall technology, which is a robust visualization system for Big Data research. [Preview Abstract] |
Saturday, October 23, 2021 10:12AM - 10:24AM |
T04.00002: Explaining Relativity with Globes, Cylinders and Balloons Arno Vigen I present a visual method to explains the abstract physics concept of relativity. Part 1 explains the physical model where changes in radial distance impacts other dimensions -- blowing up a balloon. When I blow up a balloon, the radius changes, but the longitude and latitude distance scale also increases pro rata (covariant). Yet, when I move on the surface, the radial distance does not change (invariant). This provides a physical causation model for visual students to understand those relativity concepts. Part 2 explains the Einstein 4x4 as springs connecting spheres and cylinders to generate tension in that physical system. Energy if the cylinder (longitudinal rings of electrons) changes until the globe catches up. The spring gets stressed until the sphere, really hemispheres as the critical axis is on a globe, moves to match a cylinder change (rotation). [Preview Abstract] |
Saturday, October 23, 2021 10:24AM - 10:36AM |
T04.00003: Explaining Quantum Numbers as Hemispherical Coordinates Arno Vigen I present a visual method to explain the abstract concept of quantum numbers. It maps the quantum numbers to hemispherical coordinates and thereafter to the distributions of electron shells as longitudinal rings. The electron rings at same energy and angle, so longitudinal, become a useful 3D atomic model. \begin{itemize} \item 1$^{\mathrm{st}}$ - Radial Count starting with 1 \item 2$^{\mathrm{nd}}$ -- Inclination / Longitudinal Count Starting with 0 at the Poles in 2 hemispheres (subshell-s) \item 3$^{\mathrm{rd}}$ -- Latitude distribution with a 0 meridian with -1, $+$1, and so on from that. Remember that the other hemisphere, and a 2$^{\mathrm{nd}}$ layer at the same count, offset by \textonehalf phase (180-degrees) for tightest fit \item 4$^{\mathrm{th}}$ -- Hemisphere which is -1/2 and $+$1/2 as only \textonehalf the energy in the equation. \end{itemize} The 3D mechanics is compelling and a different path than abstract formulas to reach more students. [Preview Abstract] |
Saturday, October 23, 2021 10:36AM - 10:48AM |
T04.00004: Explaining Exaggeration of Graphic Scale for Fuzzy Balls and Electron Distributions Arno Vigen Today's textbooks have fuzzy balls and fuzzy longitudinal rings. This presentation walks through the calculation of radial electrostatic versus `extra 1/r' pendulum calculations to show the vast exaggeration. The effective range for electron movement is 1/1,000 less than the textbook, so \textless 20*r$_{\mathrm{e}}$, not 10{\%} or 20{\%} of 18,778*r$_{\mathrm{e}}$ ($\alpha^{\mathrm{2}})$. By calculating the net acceleration of positions at 1-radius, 2-radius off `center', the pendulum size gets so limited. [Preview Abstract] |
Saturday, October 23, 2021 10:48AM - 11:00AM |
T04.00005: Explaining Planck's Equation Hump Via Rubber Ball Max Penetration Fun Stuff Arno Vigen The concepts of Planck's constant and the Boltzmann constant are abstract. However, when presented as huge rubber ball collisions with max penetration, the abstract becomes physical understanding. The balls compress as in PV$=$Nk$_{\mathrm{B}}$T. There is a stress that causes photons. However, if the max penetration goes to the electron shell, then an electron ejects instead, and no photon. This presentation splits the Planck equation into two superpositions, Boltzman for photon generation and Planck as the reduction of photons now. I explain the a) ratio, b) the minus one, and c) the relationship of h to Rydberg, then to max penetration distance. Planck's hv is not photons generated, but the reduction of photons that Boltzmann photons would produce if balls can compress to point-equations. The minus in the equation become physical understanding -- with lots of fun. [Preview Abstract] |
Saturday, October 23, 2021 11:00AM - 11:12AM |
T04.00006: Can Lenz's Law be wrong? Lianxi Ma, Sheng Wang The answer to this question is ``No''; Lenz's law is correct in all situations. The essence of Lenz's law is ``Nature abhors a change in flux. The induced current will flow in such a direction that the flux it produces tends to cancel the change''. I quote Griffiths here while acknowledging there are several different expressions. While Lenz's law is always correct, we should be cautious to use it when an inductor is involved; otherwise we may get an incorrect answer. I use problem 7.26 from Griffiths' book to make the point. [Preview Abstract] |
Saturday, October 23, 2021 11:12AM - 11:24AM |
T04.00007: HyFlex-ish Evan Richards With the return to on campus instruction in the time of COVID, we are all faced with questions on how can we provide on campus instruction, while at the same time supporting the progression of students who are required to quarantine. I’ll discuss my solution to this challenge as implemented in both a small, studio lab as well as in a larger, SCALE-UP facility, neither of which were formally designed for a true HyFlex modality. [Preview Abstract] |
Saturday, October 23, 2021 11:24AM - 11:36AM |
T04.00008: Physics Illustrates all Seven of the Classical Liberal Arts James Clarage Although considered a highly technical subject, physics as actually practiced, communicated and taught, often uses all seven of the classical liberal arts: grammar, rhetoric, dialectic (logic), arithmetic, geometry, astronomy, and harmony. Furthermore, no other academic discipline at the contemporary university can make a similar boast, at least to the same degree as physics. Examples from Galileo’s scientific works are used to demonstrate this thesis. In fact, one possibly overlooked factor in the 17th century Scientific Revolution may be the creative and radical blending of the seven classical liberal arts, and not simply the use of controlled experimentation. [Preview Abstract] |
Saturday, October 23, 2021 11:36AM - 11:48AM |
T04.00009: Multiple resonance in coupled Duffing oscillators and Nonlinear Normal Modes Rosty Martinez, Carlos Vasquez We study the dynamical behavior of chains of linearly coupled Duffing oscillators, driven by a sinusoidal force acting on the first slab. General analytical solutions for resonance curves for a chain of $N$ coupled Duffing oscillators are presented and discussed. For a system of two coupled oscillators, analytical resonance curves are completely depicted for high values of stiffness ($\gamma > 20$). Furthermore, resonant nonlinear normal modes (NNM) of quasi-periodic oscillations, are found within hysteresis regions, and theoretically characterized through a suitable closed expression. [Preview Abstract] |
Saturday, October 23, 2021 11:48AM - 12:00PM |
T04.00010: Simulation of two particles colliding in a vertically shaken channel Kai Yang, Jeffrey Olafsen Previously, we experimentally studied the dynamics of two particles free to collide in a vertically shaken channel. Here, we present a simulation of the system in an event driven numerical simulation written in IDL to compare with the experimental results. We considered two cases with different values of coefficient of restitution. First, we keep the coefficient of restitution constant with a value of e$=$0.9. Second, we adopted a normal distribution of values for the coefficient of restitution with a mean of 0.9 and a standard deviation $\sigma =$0.1. The same driving frequencies of the experiment, f, ranging from 23 to 32 Hz and the acceleration magnitudes, $\Gamma $, from 1.78 to 3.53 g are used. In the case of the normal distributed coefficient of restitution, the dependence on the impact velocity is similar to the experimental results. The dependence of coefficient of restitution on the driving frequency and amplitude are also examined and the results have the same trends with that of the experiment. The simulation enables us to probe the dynamics of the two bouncing particles in a much more thorough way and provides useful insights in understanding both the particle-particle and particle-plate collision processes in the experiment. [Preview Abstract] |
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