Bulletin of the American Physical Society
2018 Annual Spring Meeting of the APS Ohio-Region Section and the AAPT Michigan Section
Volume 63, Number 7
Friday–Saturday, March 23–24, 2018; East Lansing, Michigan
Session B1: Contributed Posters: Poster Session |
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Room: Biomedical and Physical Sciences Building Atrium |
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B1.00001: Spectroscopic Study of Variable Hydrogen Line Emission in Be Stars Elijah Lupardus, Craig Howald, Ann Bragg This senior project uses a spectrometer built by previous Marietta College seniors to study Be stars, which are characterized by variable emission in their hydrogen lines. The spectrometer is attached to a 16 inch reflecting telescope and raw images are obtained using the Artemis CAPTURE program. A Python program was created to translate these images into spectra and to quantify the amount of emission or absorption in the hydrogen lines. We will present spectra of omicron Cassiopeia, V442 Andromeda, HD6343, and an analysis of the changing spectral lines in gamma Cassiopeia. [Preview Abstract] |
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B1.00002: Two-Dimensional Mapping of Non-Linear Emission from Superconducting Devices Anna Wormmeester, Sthephen Remillard Superconducting devices distort signals because of the nonlinear response of the superconductors to the signal current. Multiple signals will mix, generating local intermodulation tones which enable a nondispersive investigation into superconductor nonlinearity. In this work, local points of signal distortion in a superconducting device are detected by a raster probe, which generates an image of the nonlinearity throughout the device, and highlights distortion hotspots. This gives engineers a better sense of the limitations in a device design and gives physicists insight into the intrinsic and extrinsic causes of nonlinearity. A distortion raster scan was made using a wide linewidth folded superconducting YBa$_{\mathrm{2}}$Cu3O$_{\mathrm{7}}$ structure. Refinements in the probe design improved the resolution to less than 250 $\mu $m allowing narrow linewidth devices to be imaged. Besides device characterization, this method is being used to investigate the superconducting device physics. As an example, the influence of magnetic fluxons on the nonlinear distortion will be described. [Preview Abstract] |
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B1.00003: Assessment of non-local similarity methods for electron microscopy image denoising. Petru Fodor, Alina Lazar Electron microscopy imaging has been one of the critical material characterization tools, when very high spatial resolution is required. However, when the electron doses used have to be kept small due to the possibility of sample damage or to speed-up the acquisition process, the image quality tends to be poor. This is due to both the typically low signal levels, as well as the complex noise profile associated with this type of instrumentation. In this work we explore the use of state-of-the-art image reconstruction techniques based on exploiting non-local similarities in the acquired images to extract high quality data from low electron exposure acquisitions. The viability of the methods are evaluated by comparing reconstructed results from noisy images acquired at low electron doses with imaging data obtained at high electron doses (i.e. with high signal-to-noise-ratios). The assessment is based both on standard image processing analysis measures, such as peak-signal-to-noise-ratios (PSNR), as well as the ability of automatic algorithms to extract the features of interest from denoised images. Our results indicate that this type of post-processing is a viable strategy to improve feature recognition from noisy electron microscopy image data. [Preview Abstract] |
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B1.00004: Automated Characterization of Fluxon Electrodynamics in a Superconducting Microwave Device Alexander Medema, Stephen Remillard Superconducting electronic resonators serve a wide variety of industrial and scientific applications such as MRI receiver coils and wireless transceiver filters. Characterization of fluxon electrodynamics in these devices allows for better understanding of the physical properties of superconductors and improvements to the design of cellular networking components by providing insight into how superconductors distort signals. Signal mixing through intermodulation distortion (IMD) is affected by the flow of supercurrent around fluxons modulated by the Meissner Effect. The Hope College Microwave Group has developed a method to measure the time relaxation of radio signal mixing in superconducting circuits upon the removal of an applied magnetic field. The automation in this project increased the measurement rate by two orders of magnitude revealing a previously undetectable fast process during the first second of relaxation. This work will contribute to the understanding of fluxon dynamics in superconductors and its role in signal distortion. This material is based upon work supported by the National Science Foundation under Grant Number DMR-1505617. [Preview Abstract] |
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B1.00005: Electric Fields of 2-Dimensional Current Carrying Surfaces Nikhil Watsa, Brett Bolen, Ben Holder The equations of electromagnetism describe how electric fields are produced by charge distributions in 3D space and how electric fields drive current in matter. If current is constrained to a 2D surface, the driving electric field effectively becomes a 2D field. By studying these 2D fields, we find that they have different properties than their 3D counterparts. For example, electric field strength of a point source is inversely proportional to radius in a 2D field, whereas it is inversely proportional to the radius squared in 3D fields. Moreover, the relationship between field strength and radius is depends on the spatial curvature of the surface. Therefore, with 2D analogs, we can study the influence of spatial curvature on effective field strength. In this project, we theoretically and experimentally study electric fields driving current on flat, conical, and spherical surfaces in order to evaluate the effect of curvature on field strength. [Preview Abstract] |
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B1.00006: Tests of Shrouded Wind Turbines in a Wind Tunnel Thomas Korda, Dennis Kuhl It has been predicted that a flanged shroud around a horizontal axis wind turbine will significantly enhance the production of electricity by the turbine. To test this, wind tunnel experiments were performed at three different air speeds with a model turbine positioned at the center of the test section. The air pressure in front of and behind the model turbine was measured, and the speed of the turbine was monitored by recording the voltage produced as the turbine turned. Preliminary measurements show that the presence of a shroud does increase the air flow through the turbine. Future work will test multiple designs to investigate what shroud and flange characteristics most contribute to the improvement. [Preview Abstract] |
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B1.00007: Electrical properties of Mo/SiC Schottky barrier diodes Sai Bhargav Naredla, Tom Oder Molybdenum has been recognized as a refractory metal suitable for high temperature applications. It has been used as a barrier material in processing silicon carbide devices. In this investigation, molybdenum Schottky contacts were deposited on SiC at different temperatures ranging from 26 $^{\mathrm{o}}$C to 900 $^{\mathrm{o}}$C using dc magnetron sputtering. The electrical properties of the Schottky barrier diodes were characterized using current-voltage, capacitance-voltage and current-voltage-temperature measurements. The as-deposited diodes exhibited ideality factor varying from 1.03 to 1.71 and barrier height ranging from 1.04 to 1.58 eV. Additional results from the characterization will be provided in this presentation. [Preview Abstract] |
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B1.00008: Probing Phase Transitions in Ceramic Nanofibers Nenad Stojilovic In this study we employ sol-gel and electrospinning methods, followed by annealing at different temperatures, in order to produce ceramic titania and alumina nanofibers. Titania nanofibers display anatase, rutile and anatase-rutile structures, and we make an attempt to better understand complex competition of these phases during annealing process. Alumina nanofibers, due to the coexistence of various structural phases with overlapping Bragg's peaks, are especially challenging to study using X-ray diffraction method. With the goal to better understand crystal phase formations and transitions in these nanofibers, and to ultimately produce materials with desired crystal structures, we vary annealing temperatures and heating rates and perform measurements using powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray energy dispersive spectroscopy (XEDS). [Preview Abstract] |
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B1.00009: Study Of Electron Traps In $\beta $-Ga$_{\mathrm{2}}$O$_{\mathrm{3}}$ Single Crystals Using Thermoluminescence Spectroscopy Md Minhazul Islam, Dhan Rana, Armando Hernandez, Farida Selim The presence of electronic defects in Gallium oxide (Ga$_{\mathrm{2}}$O$_{\mathrm{3}})$ single crystals greatly affects the transport of electrons and excitons. The origin of these electronic defects could be the anion/cation vacancies or the incorporation of impurities into the crystals during the growth process. The defects can act as electron traps that can affect the optical and electrical properties of Ga$_{\mathrm{2}}$O$_{\mathrm{3}}$ crystals by introducing intermediate energy levels in the bandgap. Identification of the nature of the defects is crucial for the successful application of $\beta $-Ga$_{\mathrm{2}}$O$_{\mathrm{3}}$ in optoelectronics. Shallow and deep trap levels associated with oxygen vacancies and iron impurities in doped (Mg-doped, Fe-doped, Sn-doped) and undoped $\beta $-Ga$_{\mathrm{2}}$O$_{\mathrm{3\thinspace }}$single crystals were studied using temperature and wavelength resolved thermoluminescence spectroscopy. Thermal activation energies of trap levels have been calculated using multiple heating rates and/or initial rise method depending on the kinetics and suitability. Ultraviolet to visible (UV-VIS) spectroscopy was performed on the samples to determine the bandgap (\textasciitilde 4.51 eV) that did not show any significant change due to the incorporation of dopants. Hall effect measurements were carried out at room temperature to determine the electrical parameters. [Preview Abstract] |
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B1.00010: Characterzation Of Defects In $\beta $- Ga$_{\mathrm{2}}$O$_{\mathrm{3}}$ Thin Film Grown By Metal Organic Chemical Vapor Deposition Armando Hernandez, Sahil Agarwal, David Winarski, Pooneh Saadatkia, Farida Selim $\beta -$Gallium(III)oxide (Ga$_{\mathrm{2}}$O$_{\mathrm{3}})_{\mathrm{\thinspace }}$is emerging as a semiconducting material of great interest for fabrication and advancement of high powered devices because of its very wide bandgap, excellent electrical properties and high breakdown voltage. In this work, epitaxial films of as-grown and Si doped $\beta $-Ga$_{\mathrm{2}}$O$_{\mathrm{3}}$ were fabricated by Metalorganic Chemical Vapor Deposition (MOCVD) and were characterized by X-Ray Diffraction (XRD), Thermoluminescence (TL) and Hall Effect measurements. The XRD patterns revealed formation of pure epitaxial $\beta $-Ga$_{\mathrm{2}}$O$_{\mathrm{3\thinspace }}$phase. Luminescence was recorded in the range of 200-800nm using TL between -190 $^{\mathrm{o}}$C to 360$^{\mathrm{\thinspace o}}$C to detect all emission centers. An electron trap was identified at very low temperatures. Electrical properties including resistivity, density and mobility were determined using Hall Effect measurements. This study illustrates an efficient method to grow pure epitaxial $\beta $-Ga$_{\mathrm{2}}$O$_{\mathrm{3\thinspace }}$as well as identify its fundamental properties and investigate the role of defects. [Preview Abstract] |
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B1.00011: Effects Of Dopants on the Electrical Transport Properties of Czochralski (CZ) and Edge-Defined Film-FED (EFG) Growth Grown $\beta $\textbf{-GA}$_{\mathrm{\mathbf{2}}}$\textbf{O}$_{\mathrm{\mathbf{3}}}$ Dhan Rana, Pooneh Saadatkia, Sahil Agarwal, Farida Selim Gallium oxide (Ga$_{\mathrm{2}}$O$_{\mathrm{3}})$ is the widest band gap (4.8-5.0 eV) semiconducting oxide known so far transparent up to UV-C range. Due to wide band gap and high Baliga's Figure of Merit (FOM), it possesses excellent material properties for high power device applications. It exists in five different polymorphs ($\alpha $, $\beta $, $\gamma $, $\delta $ and ), with $\beta $ being the most stable at all temperatures. Electrical transport properties of Czochralski (CZ) grown and Edge-Defined Film-Fed Growth (EFG) grown samples were evaluated by using Hall effect and Van der Pauw techniques. The conductivity of samples was found to be highly dependent on doping material. Un-doped $\beta $-Ga$_{\mathrm{2}}$O$_{\mathrm{3}}$ single crystal is highly resistive ( 10$^{\mathrm{7\thinspace }}\Omega $.cm), but the Sn-doped $\beta $-Ga$_{\mathrm{2}}$O$_{\mathrm{3}}$ has significantly lower resistivity. The resistivity of Mg-doped and Fe-doped samples were relatively higher than the un-doped samples. Positron annihilation measurements were conducted to investigate the effect of compensating defects on conductivity. [Preview Abstract] |
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B1.00012: Pulsed laser deposition of high quality rutile and anatase TiO$_{\mathrm{\mathbf{2\thinspace }}}$\textbf{films}. Prabin Dulal, Sahil Agarwal, Dave Winarski, Farida Selim Titanium oxide (TiO$_{\mathrm{2}})$ is one of the highly sought semiconducting oxide and due to its chemical and thermal stability and broad applicability, it has shown great potential for thin film applications in photo-catalysis, microelectronic devices, optical coatings, etc. In this work, we investigate the dependence of substrate type and growth parameters on TiO$_{\mathrm{2}}$ phase formation for thin films synthesized by pulsed laser deposition method (PLD) under variable growth conditions and we show how to control TiO$_{\mathrm{2}}$ structure in PLD process and obtain both pure Anatase and Rutile phases. Thin films of TiO$_{\mathrm{2}}$ were fabricated by PLD on sapphire and silicon substrates and were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), optical absorption spectroscopy and Hall-effect measurements. XRD patterns revealed that a sapphire substrate is more suitable for formation of the rutile phase in TiO$_{\mathrm{2}}$ while silicon substrate yields a pure anatase phase, even at a high temperature growth. AFM images show that the rutile TiO$_{\mathrm{2}}$ films grown at 805$^{\mathrm{o}}$C on sapphire substrate have a smoother surface than anatase films grown at 620$^{\mathrm{o}}$C. Optical absorption spectra confirmed the band gap energy of 3.08 eV for rutile phase and 3.29 eV for anatase phase. All the deposited films exhibit the usual high resistivity of TiO$_{\mathrm{2.\thinspace }}$ [Preview Abstract] |
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B1.00013: A Computational Simulation of Belousov-Zhabotinsky Wave Behavior around Obstacles Nathaniel Smith, Niklas Manz, John Lindner We developed an Objective-C model to analyze the propagation behavior of reaction-diffusions waves around obstacles in a two-dimensional, narrow channel. By comparing the wave behavior with experimental results under known conditions, the program was verified to correctly simulate their propagation. Objects placed in the path of an initially planar propagating wave, impeded the wave's movement due to the decreased speed of positively curved fronts after passing an object. We investigated the effect of various obstacle shapes (n-sided polygons, diamonds, ellipses) and extensions parallel (x-dimension) and perpendicular (y-dimension) to the channel and their influence on the total propagation time within the channel. We will also report on the effect of location of a defined number of obstacles within the channel, i.e., evenly spread or closer packing. [Preview Abstract] |
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B1.00014: Transition to Chaos in an Unforced, Undamped Double Pendulum using Numerical Simulations Noah Lenz, Cavendish McKay We study the transition to chaos in an unforced, undamped double pendulum using numerical simulations. Two properties, the Lyapunov exponent and the dimension of the invariant manifold, are used to determine the presence of chaotic behavior for a given set of initial conditions. Since the system is Hamiltonian, care must be taken in computing and interpreting the Lyapunov exponent. We find that the path from linear behavior to chaotic behavior depends on the initial distribution of energy in the system, and that for certain initial conditions spontaneous symmetry breaking and islands of nonchaotic behavior appear. [Preview Abstract] |
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B1.00015: Improved sky subtraction for galaxy kinematics: application to Magellan spectroscopy of NGC 7727 Noah Pinkney, Jason Pinkney The Earth's atmosphere contributes light to galaxy spectra taken from the ground and this contamination can corrupt measurements of absorption line strengths and stellar velocity dispersions. We develop a method of scaling a non-contemporary sky exposure for use with galaxy spectra for which the galaxy light fills the entire slit. The method relies on the comparison of the spectral light profile (SLP) with a light profile taken from an independent, sky-subtracted image (ILP). The method is applied to longslit spectra of NGC 7727 (Arp 222) taken with the Magellan I (Baade) 6.5-m telescope. We demonstrate the improvement of stellar kinematical measurements with the new method. NGC 7727 is particularly interesting because it is undergoing a merger and our slit crosses the remnant of the secondary nucleus. [Preview Abstract] |
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B1.00016: Stellar and gas kinematics in the elliptical galaxy NGC 2434 Bradley Lockhart, Jason Pinkney We observed the E0 elliptical galaxy NGC 2434 in 2001 using the B&C spectrograph on the Magellan I 6.5-m telescope. The slit was not long enough to sample the sky spectrum without including galaxy light and so a new approach was developed for sky subtraction. We describe the approach elsewhere (see poster on NGC 7727) and report here on the findings for NGC 2434. The sky contamination in the NGC 2434 data was primarily airglow since it was observed in dark sky conditions. Our new sky subtraction method reveals that a little less than half of the counts at the ends of the slit (R=35") are attributable to sky and the rest are galaxy. The new method allows stellar kinematics measurements beyond 25" from the galaxy's center at two different position angles. Our kinematics help clarify the galaxy's major axis, which is ambiguous from surface photometry alone. Subtraction of a stellar template allows us to also measure extended gas kinematics in NGC 2434 from the residual [OIII] emission. We are aware of no other published gas kinematics for this galaxy. [Preview Abstract] |
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B1.00017: Stellar and gas kinematics in the lenticular galaxy NGC 3489 Matthew Sibila, Jason Pinkney We observed the S0$_3$ lenticular galaxy NGC 3489 using the B$\&$C spectrograph on the Magellan I, 6.5-m telescope in 2001. The slit was not long enough to sample the sky spectrum without including galaxy light and so a new approach was developed for sky subtraction. We describe the approach elsewhere (see poster on NGC 7727) and report here on the findings for NGC 3489. The sky contamination in the NGC 3489 data was primarily airglow since it was observed in dark sky conditions. Our new sky subtraction method reveals that about half of the counts at the ends of the slit (R=35") are attributable to sky and the rest are galaxy. The absolute galaxy counts are greater than the other two galaxies presented here, improving the reliability of kinematics beyond 25". We measure stellar velocity dispersions significantly lower than Caon et al (2000) but consistent with the results of SAURON (Emsellem et al. 2004). Subtraction of a stellar template allows us to also measure gas kinematics in NGC 3489 from the residual [OIII] emission. [Preview Abstract] |
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B1.00018: Electrostatics at the Molecular Level Ulrich Zurcher We use electrostatics and simple description of electronic repulsion to describe intra- and inter-molecular interactions of molecules. We describe hydrogen-bonding and relate the bonding energies to thermal properties, including the temperature of melting of ice. [Preview Abstract] |
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B1.00019: Optical properties of SrTiO$_3$ and LaSrAlO$_4$ N.J. Gantzler, S.V. Dordevic We report on the optical properties of SrTiO$_3$ and LaSrAlO$_4$, both of which are materials currently used as substrates for superconducting thin films. Their role in the superconductivity of these structures is not fully understood. In this work, we evaluate room temperature spectra collected from far-infrared to near-ultraviolet for both SrTiO$_3$ and LaSrAlO$_4$. Overall, the transmission and the reflection spectra of both materials are found to be less than 25 $\%$, and above the bandgap the materials are completely opaque. The values for the band gaps, obtained from transmission spectra, are 3.21 eV for SrTiO$_3$ and 5.03 eV for LaSrAlO$_4$.The reflection spectra, also less than 25 $\%$, reveals signatures of interband transitions. After fitting the transmission and reflection spectra simultaneously using the Tauc-Lorentz model, we generate the optical conductivity along with other optical functions. [Preview Abstract] |
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B1.00020: Molecular Organization of Vapor Deposited Rod-Like Molecules Andrew Audley, Jutta Luettmer-Strathmann Thiophenes are $\pi$-conjugated organic molecules with applications in electronic devices. Alpha-sexithiophene ($\alpha$-6T) is a rod-like molecule consisting of six thiophene rings. Previous experimental research has shown that vapor deposition of rod-like organic molecules onto substrates of varying temperatures yields varying material phases. These include smectic liquid crystalline phases, which have been shown to promote anisotropic charge carrier mobility. In this work, we use a course-grained model for $\alpha$-6T, representing it as a chain of discotic particles with fixed bond lengths and fixed bond angles. We perform Monte Carlo simulations of multiple chains introduced at varying rates in vacuum near two adsorbing surfaces. These simulations are not chemically realistic, instead focusing on the general features of the physical systems. The goal of this work is to simulate vapor deposition of materials on a substrate under varying temperatures and deposition rates and investigate the resulting phases. [Preview Abstract] |
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B1.00021: Two-Stream Instability in Graphene Mitchell Duffer, Ben Yu-Kuang Hu We investigate the unstable modes of the two-stream instability in graphene. This instability occurs when a population of electrons streams past another inside graphene. We obtain unstable modes by numerically determining the zeros of the non-equilibrium graphene dielectric function using MATLAB. The dielectric function used in this study, in contrast to previous studies, includes the effects of the particle-hole excitation continuum (PHEC) that normally quells the evolution of unstable plasmons. MATLAB's built in zero solver is employed to solve the sixth order polynomial and determine its roots. For some range of parameters, the zeros are found to exist in upper half of the complex plane. This indicates that there is a range of unstable modes that exists even with the incorporation of PHEC. The presence of these unstable modes signifies that the plasmons' amplitudes increase with time. [Preview Abstract] |
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B1.00022: Evidence for Time-Reversal Symmetry breaking in 4f-doped Bismuth Selenide Stephen Hofer, Dipanjan Mazumdar Time-Reversal Symmetry (TRS) is a hallmark of Topological Insulator (TI) systems. TRS in conjuction with the strong Spin-Orbit Coupling (SOC) present in Bismuth Selenide is responsible for the uniquely robust surface states shown in this material. Breaking TRS in these systems in order to achieve strong spin polarization requires the presence of a magnetic field throughout the material. We achieve this effect by doping the system with 4f elements whereby the magnetic field is provided by the local magnetic moments of the dopants manifesting ferromagnetic behavior. In this work we show high quality crystal growth using X-Ray Diffraction, ferromagnetic behavior in our doped system using SQUID, and Electronic Bandstructure using Resonant ARPES. [Preview Abstract] |
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B1.00023: Measuring adsorbate-induced resistivity changes on Au (111) thin films Jiang Hong Wan, Dennis Kuhl Theoretical predictions for the relationship between broad-band adsorbate-induced changes in the resistivity and the reflectance of thin metal films have been shown in the literature to fail quantitatively in all experimental tests, and to fail qualitatively in some experimental tests. We are building an experiment that will enable both resistivity change and reflectance change to be measured simultaneously on the same sample, which should enable clarification of some issues of disagreement between experiment and theory. The experiment requires ultra-high vacuum, four-probe resistance measurements, a lock-in amplifier technique, and gas dosing methods. Preliminary measurements of resistivity change for dibutyl sulfide adsorption on a 150 nm thick, polycrystalline gold (111) film will be presented. [Preview Abstract] |
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B1.00024: Building a three-dimensional model of kinesin stepping on a microtubule Matthew Murrow, Jutta Luettmer-Strathmann The motor protein kinesin plays an integral role in cell function, transporting, for example, vesicles and proteins. Kinesins are composed of two heads, two neck linkers, and a coil connecting these parts to the carried cargo. Kinesin molecules, upon ATP binding, have been shown experimentally to walk along tubulin-based protein structures called microtubules in a hand-over-hand stepping motion, carrying their cargo eight nanometers per step. A number of kinesin models for computer simulations have been developed but none are able to replicate the observed stepping efficiency. Atomistic models provide insight into details of the moving motor protein but are computationally too expensive to simulate stepping. Abstract models are more efficient but can be difficult to relate to the biological system. The goal of this work is to build a coarse-grained 3D protein model of the kinesin-microtubule complex that can be simulated economically and replicate the stepping efficiency of the motor protein. To this end we are developing an interaction site model for the protein heads and neck-linker domain that will be combined with an existing microtubule model for Brownian dynamics simulations. [Preview Abstract] |
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B1.00025: Rotating Dust Rings in a Complex Plasma William Theisen A ring shaped plasma potential was generated inside a complex plasma using a carved out ring shaped metal anode. A simple dust ring formed inside the circular potential trough. Occasionally the ring would start to rotate due to the unbalanced forces generated by the flow of charges in the plasma. Particle position data was taken and analyzed using standard techniques. Results were compared with predictions of normal mode calculations. [Preview Abstract] |
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B1.00026: Super Soft Particle Which Arises from Dimension of Information Hassan Gholibeigian, Kazem Gholibeigian It seems that there is dimension of information which is nested with space-time. Density of information \textbraceleft Super Soft (i.e. zero energy) Particles\textbraceright (SSP) is proportionate with corresponding density of matter and energy in space-time. Because of particles in matter and energy need information to know their next quantum state. Therefore, the SSP which arise from dimension of information should be much near/matched with fundamental particles. Because particles in their motion can't delay for receiving and analyzing SSP for finding their next quantum state. Therefore, photons and gravitons are which inside the black hole can't delay for receiving soft hair (soft photons and gravitons) from horizon for analyzing and understanding their next quantum state. Therefore, this is a lack in Hawking and their co-workers' paper under title of ``Soft Hair on Black Holes''. Soft particles (sub-particles) are as a door to the dimension of information, for receiving and analyzing SSP for finding the particles' next quantum state. Therefore, soft quarks involving quark, get the SSP (information for quarks), for analyzing and understanding quark's next quantum state. Also the soft gluons receive SSP (information for gluons) for finding their pathway for interaction with quarks. [Preview Abstract] |
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B1.00027: BLiSS Physics: A Studio Physics Course for Life Science Students Vashti Sawtelle, Kathleen Hinko Introductory Physics for the Life Sciences (IPLS) courses are gaining momentum in the physics education community, with the creation of multiple curricula for a variety of implementation strategies. At Michigan State University, we have designed an integrated lab-lecture (studio style) introductory physics course that meets the needs of life science students. Our design of this course focused on (1) connecting the disciplines of physics, biology, and chemistry through designing authentic tasks for students in collaboration with biophysicists, (2) incorporating computational simulations that model complex biological phenomenon, and (3) building positive relationships for life science students with physics. This poster will describe our overarching approach to the design of this course, share example curricular materials for manifesting these design goals in the classroom and describe some of the ongoing research on this course. [Preview Abstract] |
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B1.00028: What counts in laboratories: Developing a practice-based identity survey Kelsey Funkhouser, Marcos Caballero, Paul Irving, Vashti Sawtelle An essential step in the process of developing a physics identity is the opportunity to engage in authentic physics practices. Physics laboratory courses are generally structured as a place for students to gain experience with physics practices. This makes laboratory courses an ideal place to look at the impact these authentic science practices have on students’ physics identity. As part of the development of a practice based identity survey, we have interviewed students in a variety of physics lab classes, from intro algebra based to advanced lab, to gain insight into their interpretations of different commonly discussed practices. To ground our survey in students’ experiences, we have asked questions about what these practices mean to the students. We present our findings on how students interpret these practices and situate themselves with respect to the practices as an indicator of their physics identity. [Preview Abstract] |
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B1.00029: Teaching at African Institutes for Mathematical Sciences Pawel Danielewicz African Institutes for Mathematical Sciences (AIMS) runs one-year residential Masters Programs at 6 Institutes across Africa under their Next Einstein Initiative (NEI). The goal of AIMS NEI is to bring the best students getting bachelor’s degrees at African universities to the level where they can succeed in the graduate programs at universities outside of Africa. Danielewicz taught at the AIMS Institutes in Tanzania and Rwanda. He discusses day-to-day operation of AIMS NEI, their funding, recruiting of students, lecturers and tutors and his personal experiences in teaching at the Institutes. [Preview Abstract] |
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B1.00030: Life After VPython: Developing E\&M Computer Labs Using Matplotlib \& Bokeh Thomas Finzell The \emph{Developers of Instructions, Assessments, and Lessons for Undergraduate Physics} (DIALUP) team at the University of Michigan has developed a suite of three novel computational labs for second semester introductory physics. Eschewing the oft used VPython package, we have instead incorporated components from popular Python visualization packages that students could potentially utilize in their future work; specifically, Matplotlib and Bokeh. Using these more modern packages allows us to incorporate many new tools, including Widgets, which can give students a new layer of information feedback. All of this lab material will be made available through the \emph{Partnership for Integration of Computation into Undergraduate Physics} (PICUP) webpage. \noindent The DIALUP team is composed of: Chelsea Hendrus, Grace Kerber, Gle Leung, Jordan Roth, and Alec Tewsley-Booth. [Preview Abstract] |
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B1.00031: Using machine learning to predict integrating computation into physics courses Nicholas Young, Marcos D. Caballero We recently completed a national survey of faculty in physics departments to understand the state of computational instruction and the factors that underlie that instruction. We then used supervised learning to explore the factors that are most predictive of whether a faculty member decides to include computation in their physics courses. We find that personal, attitudinal, and departmental factors vary in usefulness for predicting whether faculty include computation in their courses. We will present the least and most predictive personal, attitudinal, and departmental factors. [Preview Abstract] |
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B1.00032: Exploring Performance Differences in Science, Technology, Engineering, and Math Courses Nita Kedharnath Performance differences in science, technology, engineering, and mathematics (STEM) courses are an unfortunate reality at many large universities throughout the country. Despite entering STEM classes with the same cumulative GPA, major, ACT math scores, and other relevant academic factors, often times women and minorities underperform. After examining different aspects of the classes, we conclude that stereotype threat, where a person experiences a fear of confirming a negative stereotype about their identity when in an evaluative environment, is a likely cause for these performance differences since the extra anxiety often leads to underperformance. [Preview Abstract] |
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