Bulletin of the American Physical Society
APS April Meeting 2015
Volume 60, Number 4
Saturday–Tuesday, April 11–14, 2015; Baltimore, Maryland
Session H5: Computional Physics-General Methods |
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Sponsoring Units: DCOMP Room: Key 1 |
Sunday, April 12, 2015 8:30AM - 8:42AM |
H5.00001: Role of weak interactions in phase transitions of layered transition metal dichalcogenides: An ab initio study Niladri Sengupta, Adrienn Ruzsinszky, John P. Perdew Phase transitions of layered materials are not often clearly explained and captured by the GGA level density functional calculations. Weak interactions might play an important role in these phase transitions. Now GGA can not describe well weak interactions. So we intend to use several new meta GGAs (TPSS, RevTPSS, MS family etc.), many body VDW corrected meta GGAs and RPA to study phase transitions of layered transition metal dichalcogenides (ME$_{2}$ ; M $=$ Ti, V, Cr, Ta, Mo, W ; E $=$ Se, S, Te) and investigate the role of weak interactions in those cases. [Preview Abstract] |
Sunday, April 12, 2015 8:42AM - 8:54AM |
H5.00002: An intrinsic poperty of memory of the Cellular automaton infrastructure of Nature leading to the organization of the physical world as an Internet o things; TOE$=$IOT Simon Berkovich The undamental advantage of a Cellular automaton construction foris that it can be viewed as an undetectable absolute frame o reference, in accordance with Lorentz-Poincare's interpretation.. The cellular automaton model for physical poblems comes upon two basic hurdles: (1) How to find the Elemental Rule that, and how to get non-locality from local transformations. Both problems are resolved considering the transfomation rule of mutual distributed synchronization [1] Actually any information proessing device starts with a clocking system. and it turns out that ``All physical phenomena are different aspects of the high-level description of distributed mutual synchronization in a network of digital clocks'' [1]. Non-locality comes from two hugely different time-scales of signaling.. The universe is acombinines information and matter processes, These fast spreading diffusion wave solutions create the mechanism of the Holographic Universe. And thirdly Disengaged from synchronization, circular counters can perform memory functions by retaining phases of their oscillations, an idea of Von Neumann' [2]. Thus, the suggested model generates the necessary constructs for the physical world as an Internet of Things. Life emerges due to the specifics of macromolecules that serve as communication means, with the holographic memory... [1] Jingzheng Qin, ``Elementary Particles of Matter in a Cellular Automaton Framework'',GWU, Master thesis, May 2012, http://pqdtopen.proquest.com/{\#}abstract?dispub$=$1510409 [2] Von Neumann, \textbf{Patent 2815488, 1954.} [Preview Abstract] |
Sunday, April 12, 2015 8:54AM - 9:06AM |
H5.00003: Initial Results of Coupling the Output of a Regional Weather Model and a Localized Computational Fluid Dynamics Model at the Atlantic City International Airport Joseph Trout, J. Russell Manson, Manny Rios, David King, Nicholas DeCicco Wake Vortex Turbulence is the turbulence generated by an aircraft in flight. This turbulence is created by vortices at the tips of the wing that may decay slowly and persist for several minutes after creation. The strength, formation and lifetime of the turbulence and vortices are effected by many things including the weather. Here we present the preliminary results of an investigation of low level wind fields generated by the Weather Research and Forecasting Model and an analysis of historical data. The simulations are used as inputs for the computational fluid dynamics model (OpenFoam) that will be used to investigate the effect of weather on wake turbulence. The initial results of the OpenFoam model are presented elsewhere. Presented here are the initial results from a research grant, ``A Pilot Project to Investigate Wake Vortex Patterns and Weather Patterns at the Atlantic City Airport by the Richard Stockton College of NJ and the FAA'' [Preview Abstract] |
Sunday, April 12, 2015 9:06AM - 9:18AM |
H5.00004: Computational methods in the exploration of the classical and statistical mechanics of celestial scale strings: Rotating Space Elevators Steven Knudsen, Leonardo Golubovic With the advent of ultra-strong materials, the Space Elevator has changed from science fiction to real science. We discuss computational and theoretical methods we developed to explore classical and statistical mechanics of rotating Space Elevators (RSE)[1,2]. An RSE is a loopy string reaching deep into outer space. The floppy RSE loop executes a motion which is nearly a superposition of two rotations: geosynchronous rotation around the Earth, and yet another faster rotational motion of the string which goes on around a line perpendicular to the Earth at its equator. Strikingly, objects sliding along the RSE loop spontaneously oscillate between two turning points, one of which is close to the Earth (starting point) whereas the other one is deeply in the outer space. The RSE concept thus solves a major problem in space elevator science which is how to supply energy to the climbers moving along space elevator strings. The exploration of the dynamics of a floppy string interacting with objects sliding along it has required development of novel finite element algorithms described in this presentation.\\[4pt] [1] L. Golubovic and S. Knudsen, EPL 86, 34001 (2009); \\[0pt] [2] S. Knudsen and L. Golubovic, EPJP 129, 242 (2014). [Preview Abstract] |
Sunday, April 12, 2015 9:18AM - 9:30AM |
H5.00005: Study of the Focusing Horns Performance Through Pion Flux Distribution Amit Bashyal Beamline design is an essential part of accelerator-based neutrino experiments. The Long-Baseline Neutrino Facility (LBNF) hosted by Fermilab, in which a high intensity proton beam will be used to generate an intense beam of neutrinos, requires a detailed and optimized beamline design. One of the most important parts of the optimization is that of the focusing system, where parameters such as the horn currents, horn shape, target size and location of the target and horns have a strong impact on the neutrino flux. This study uses the momentum and position distributions of pions at the end of the focusing horns to understand the effect of the horns as a function of pion energy. This talk presents a comparison of pion fluxes between a NuMI-style configuration and several new configurations optimized to LBNF physics goals. The pion flux distributions are compared against one another as a function of position, energy and momentum, in order to understand the performance of these different designs. [Preview Abstract] |
Sunday, April 12, 2015 9:30AM - 9:42AM |
H5.00006: ABSTRACT WITHDRAWN |
Sunday, April 12, 2015 9:42AM - 9:54AM |
H5.00007: ABSTRACT WITHDRAWN |
Sunday, April 12, 2015 9:54AM - 10:06AM |
H5.00008: Quantum-Inspired Genetic Algorithm or Quantum Genetic Algorithm: Which Is It? Erika Jones Our everyday work focuses on genetic algorithms (GAs) related to quantum computing where we call ``related'' algorithms those falling into one of two classes: (1) GAs run on classical computers but making use of quantum mechanical (QM) constructs and (2) GAs run on quantum hardware. Though convention has yet to be set with respect to usage of the accepted terms quantum-inspired genetic algorithm (QIGA) and quantum genetic algorithm (QGA), we find the two terms highly suitable respectively as labels for the aforementioned classes. With these specific definitions in mind, the difference between the QIGA and QGA is greater than might first be appreciated, particularly by those coming from a perspective emphasizing GA use as a general computational tool irrespective of QM aspects (1) suggested by QIGAs and (2) inherent in QGAs. We offer a theoretical standpoint highlighting key differences--both obvious, and more significantly, subtle--to be considered in general design of a QIGA versus that of a QGA. [Preview Abstract] |
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