Bulletin of the American Physical Society
82nd Annual Meeting of the APS Southeastern Section
Volume 60, Number 18
Wednesday–Saturday, November 18–21, 2015; Mobile, Alabama
Session L1: Instrumentation, Applied Physics and Physics Education |
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Chair: Mary Ellen Zvanut, University of Alabama-Birmingham Room: Riverview Plaza Hotel Bon Secour Bay Ballroom I |
(Author Not Attending)
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L1.00001: Quantifying the Risk of Damage to Integrated circuits to Space Radiation and Mitigation Methods William Atkinson The risk that electronics face in space from energetic charged particles emitted by the sun can be large. The risk varies from transient Single Event Upsets (SEUs) to permanent damage in Single Event Burnouts (SEBs). All of these single event effects are produced by an energetic particle striking a transistor. In space the particle may be a proton, alpha particle, or an ion as heavy as iron. In the atmosphere, the offending particle is a neutron produced by cosmic ray reacting at the nuclear level with air molecules. This presentation discusses software analysis tools designed to help quantify the risk space weather can pose to electronics and methods to mitigate the risk to the electronics. One such tool is TSAREME (Total Space and Atmospheric Radiation Effects on Microelectronics).The TSAREME results shown agree well with satellite measurements taken over four years for various integrated Circuit (IC) designs with feature sizes varying from a couple of microns to 15 nanometers. Major findings using TSAREME were that there are a number of alternatives to conventional CMOS ICs that significantly reduce the risk of electronic disruptions in space. Among these alternatives are silicon-on-insulator, and silicon-on-sapphire. [Preview Abstract] |
Saturday, November 21, 2015 8:42AM - 8:54AM |
L1.00002: Using Statistical Analysis to Extract Meaningful Beam Position Monitor Data Eric Thompson BPM data taken from rayTrace measurement at CEBAF consist of betatron orbits, BPM noise, residual dispersions, and malfunctioned BPM signals. To extract meaningful betatron orbits from the noise, as well as identify contributions of different noise sources and their behaviors, model independent analysis (MIA) was conducted on the rayTrace data. Singular value decomposition (SVD, a method of statistical analysis) was used to identify principle components of the BPM data. Our results clearly demonstrate dominant betatron orbits, less dominant residual dispersion, signals from malfunctioned BPMs, and BPM noises. Here the residual dispersion appears as the spatial dependence of the horizontal orbit, which is comparable with Elegant generated dispersion based on the design model. SVD also reveals the temporal dependence related to each principle component, such as kicker strength and energy variation. Finally, convergence checks were performed by varying the number of BPM orbits and number of BPMs used for SVD analysis. [Preview Abstract] |
Saturday, November 21, 2015 8:54AM - 9:06AM |
L1.00003: Single-molecule recycling in a nanochannel Bo Wang, Brian K Canfield, Lloyd M Davis Use of a confocal fluorescence microscope for prolonged observation of a single fluorescently labelled molecule in solution can be accomplished by confining the solution to a nanochannel and alternating the flow so that the molecule is ``recycled'' in that it returns to pass again through the focused laser spot. To accomplish recycling experimentally, we have developed a custom microscope and LabVIEW real-time control system, which processes the stream of single-photon detection events to determine the transit time of a molecule and alternates the voltage that drives electrokinetic motion along the nanochannel after a set delay. We use fluidic devices that are themselves recycled from prior experiments and we describe methods for preparing the nanochannels. In initial investigations with fluorescently labeled proteins, sticking of molecules to the walls of the nanochannel limits experiments and we discuss studies on procedures for mitigating sticking. We give details on ongoing experiments using To-Pro-3 labeled dsDNA molecules in a pH 8.0 buffer. We also present Monte Carlo simulations to determine favorable experimental conditions for determining single-molecule diffusivities from the fluctuations in the intervals between successive detections. This provides a potentially accurate measure of molecular binding interactions for applications in pharmaceutical drug discovery research. [Preview Abstract] |
(Author Not Attending)
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L1.00004: Single Event Effects from Ions Produced in Nuclear Reactions of Transistors with Cosmic Rays William Atkinson Single Event Effects (SEEs), disruptions in a microelectronic device caused by the passage of an energetic particle through the sensitive region of the device, are an increasing problem with advances in technologies. Two trends are responsible for the increased number of SEEs over the last decade. First, with the reduction of the operating voltages, devices have are susceptible to smaller amounts of radiations. Secondly, the data densities (bits per device) increased dramatically to meet the demand for more memory and faster processing time. This paper presents models for generating typical near earth radiation environments in space as well as in the atmosphere, a model for transporting these radiations across the various materials of the device, and programs to compute the SEE rate of the device from data generated by the transport model using detailed structures available for the devices modeled. The results show that with the continued trends, nano size circuits become especially vulnerable to direct and indirect ionization (ions produced as a result of nuclear reactions with the circuit materials. [Preview Abstract] |
Saturday, November 21, 2015 9:18AM - 9:30AM |
L1.00005: Analysis of thin-film system with Michelson interferometer David Didie, Daniel Didie, Haesung Park, Sanichiro Yoshida, Ik-keun Park A Michelson interferometer was used to characterize the adhesion of thin-film systems. A thin-film specimen was configured as an end-mirror of the interferometer with the film surface facing the beam splitter and oscillated with an acoustic transducer from the rear. The film-surface oscillation amplitude was evaluated as the relative optical path difference of the two arms behind the beam splitter. With the beams slightly tilted with each other, the path difference was observed as parallel interference fringes. The oscillation amplitude was quantified as the reduction in the fringe contrast in the spatial-frequency domain. Our specific interest was to test specimens in an oscillation frequency range of actual uses of thin-film products. Thus, audible acoustic frequency was used. 100 nm-thick platinum (Pt) films coated on a silicon (Si) substrate were used as sample specimens. A Pt-film coated on a surface-treated Si substrate and Pt-film coated on an untreated Si substrate specimens were tested for comparison. The treated and untreated specimens indicated resonance-like behavior around 8 kHz and 13 kHz, respectively. The base-line test on an uncoated Si specimen confirmed that the observed behavior represents dynamics of the film-substrate interface. [Preview Abstract] |
Saturday, November 21, 2015 9:30AM - 9:42AM |
L1.00006: ABSTRACT WITHDRAWN |
Saturday, November 21, 2015 9:42AM - 9:54AM |
L1.00007: Randomizing Homework and Exams with Python, LaTeX, and RandAssign Geoffrey Poore Randomization is common in online homework systems, since it discourages copying and can encourage mastery by allowing students to attempt several variations on a problem. Paper-based homework and exams could also benefit from randomization in many cases. Over the past three years, I have developed a workflow for creating randomized paper-based assignments using Python and LaTeX. This has culminated in the RandAssign package for Python, which simplifies the creation of assignments and has the potential to automate much of the grading process. I will present examples from physical science and introductory physics classes. [Preview Abstract] |
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