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  • Astrophysics  (60)
  • Computational Physics
  • Dynamics, dynamical systems, lattice effects
  • 1
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    Smoothed dissipative particle dynamics model for mesoscopic multiphase flows in the presence of thermal fluctuations (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-08-06
    Description: Author(s): Huan Lei, Nathan A. Baker, Lei Wu, Gregory K. Schenter, Christopher J. Mundy, and Alexandre M. Tartakovsky Thermal fluctuations cause perturbations of fluid-fluid interfaces and highly nonlinear hydrodynamics in multiphase flows. In this work, we develop a multiphase smoothed dissipative particle dynamics (SDPD) model. This model accounts for both bulk hydrodynamics and interfacial fluctuations. Interfac… [Phys. Rev. E 94, 023304] Published Fri Aug 05, 2016
    Keywords: Computational Physics
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Effect of long- and short-range order on SiGe alloy thermal conductivity: Molecular dynamics simulation (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-05-15
    Description: Author(s): Christopher H. Baker and Pamela M. Norris We report the role of long- and short-range order on the thermal conductivity and mode relaxation times of a model Si 0.5 Ge 0.5 alloy using molecular dynamics simulation. All interactions used the Stillinger-Weber potential and the Si and Ge atoms differed only by their mass. The simulated alloys were... [Phys. Rev. B 91, 180302(R)] Published Tue May 12, 2015
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Mapping the chemical potential landscape of a triple quantum dot (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-08-27
    Description: Author(s): M. A. Broome, S. K. Gorman, J. G. Keizer, T. F. Watson, S. J. Hile, W. J. Baker, and M. Y. Simmons We investigate the nonequilibrium charge dynamics of a triple quantum dot and demonstrate how electron transport through these systems can give rise to nontrivial tunneling paths. Using a real-time charge sensing method, we establish tunneling pathways taken by particular electrons under well-define… [Phys. Rev. B 94, 054314] Published Fri Aug 26, 2016
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Magnetoelastic coupling in bulk and nanoscale MnO (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-07-06
    Description: Author(s): Q.-C. Sun, S. N. Baker, A. D. Christianson, and J. L. Musfeldt Phonons are exquisitely sensitive to finite length scale effects because they are intimately connected to charge, structure, and magnetism, and a quantitative analysis of their behavior can reveal microscopic aspects of spin-lattice interaction. To investigate these effects in a model correlated oxi... [Phys. Rev. B 84, 014301] Published Tue Jul 05, 2011
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Application of the wavelet transform to nanoscale thermal transport (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-09-21
    Description: Author(s): Christopher H. Baker, Donald A. Jordan, and Pamela M. Norris The continuous wavelet transform is employed to analyze the dynamics and time-dependent energy distribution of phonon wave-packet propagation and scattering in molecular dynamics simulations. The equations of the one-dimensional continuous wavelet transform are presented and then discretized for imp... [Phys. Rev. B 86, 104306] Published Thu Sep 20, 2012
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 6
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    Isotropic model for cluster growth on a regular lattice (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-08-17
    Description: Author(s): Christian A. Yates and Ruth E. Baker There exists a plethora of mathematical models for cluster growth and/or aggregation on regular lattices. Almost all suffer from inherent anisotropy caused by the regular lattice upon which they are grown. We analyze the little-known model for stochastic cluster growth on a regular lattice first int... [Phys. Rev. E 88, 023304] Published Fri Aug 16, 2013
    Keywords: Computational Physics
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    GRAVITATIONAL WAVE EXTRACTION FROM AN INSPIRALING CONFIGURATION OF MERGING BLACK HOLES (2005)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: We present new techniques for evolving binary black hole systems which allow the accurate determination of gravitational waveforms directly from the wave zone region of the numerical simulations. Rather than excising the black hole interiors, our approach follows the "puncture" treatment of black holes, but utilizing a new gauge condition which allows the black holes to move successfully through the computational domain. We apply these techniques to an inspiraling binary, modeling the radiation generated during the final plunge and ringdown. We demonstrate convergence of the waveforms and and good conservation of mass-energy, with just over 3% of the system s mass converted to gravitational radiation.
    Keywords: Astrophysics
    Format: application/pdf
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  • 8
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    Autonomous Sciencecraft Experiment (ASE) Test Operations in 2003 (2003)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: NASA has identified the development of an autonomously operating spacecraft as a necessity for an expanded program of missions exploring the Solar System. The Autonomous Sciencecraft Experiment (ASE) has been selected for flight demonstration by NASA s New Millennium Program (NMP) as part of the Space Technology 6 (ST6) mission. ASE is scheduled to fly on the US Air Force Research Laboratory (AFRL) Techsat-21 constellation in 2006. Tech- Sat-21 consists of three satellites flying in a variable-geometry formation in Earth orbit. Each satellite is equipped with X-band Synthetic Aperture Radar, yielding high spatial resolution images (approx. 3 m) of the Earth s surface. The constellation will fly at an altitude of 550 km, in a 35.4 inclination circular orbit, yielding exact repeat-track observations every 13 days. Prior to full deployment, elements of the versatile ASE spacecraft command and control software, image formation software and science processing software will be utilized and tested on two very different platforms in 2003: AirSAR and EO-1 (described below). Advantages of Autonomous Operations: ASE will demonstrate advanced autonomous science data acquisition, processing, and product downlink prioritization, as well as autonomous spacecraft command and control, and fault detection. The advantages of spacecraft autonomy are to future missions include: (a) making the best use of reduced downlink; (b) the overcoming of communication delays through decisionmaking in situ, enabling fast reaction to dynamic events; (c) an increase of science content per byte of returned data; and (d) an avoidance of return of null (no-change/no feature) datasets: if there is no change detectable between two scenes of the same target, there is no need to return the second dataset.
    Keywords: Astrophysics
    Type: Lunar and Planetary Science XXXIV; LPI-Contrib-1156
    Format: text
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  • 9
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    Impact of LISA's Low Frequency Sensitivity on Observations of Massive Black Hole Mergers (2005)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: LISA will be able to detect gravitational waves from inspiralling massive black hole (MBH) binaries out to redshifts z 〉 10. If the binary masses and luminosity distances can be extracted from the Laser Interferometer Space Antenna (LISA) data stream, this information can be used to reveal the merger history of MBH binaries and their host galaxies in the evolving universe. Since this parameter extraction generally requires that LISA observe the inspiral for a significant fraction of its yearly orbit, carrying out this program requires adequate sensitivity at low frequencies, f 〈 10(exp -4) Hz. Using several candidate low frequency sensitivities, we examine LISA's potential for characterizing MBH binary coalescences at redshifts z 〉 1.
    Keywords: Astrophysics
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  • 10
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    HI Absorption in Merger Remnants (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: It has been proposed that ultraluminous infrared galaxies (ULIRGs) pass through a luminous starburst phase, followed by a dust-enshrouded AGN phase, and finally evolve into optically bright "naked" quasars once they shed their gas/dust reservoirs through powerful wind events. We present the results of our recent 21- cm HI survey of 21 merger remnants with the Green Bank Telescope. These remnants were selected from the QUEST (Quasar/ULIRG Evolution Study) sample of ULIRGs and PG quasars; our targets are all bolometrically dominated by AGN and sample all phases of the proposed ULIRG -〉 IR-excess quasar -〉 optical quasar sequence. We explore whether there is an evolutionary connection between ULIRGs and quasars by looking for the occurrence of HI absorption tracing neutral gas outflows; our results will allow us to identify where along the sequence the majority of a merger's gas reservoir is expelled.
    Keywords: Astrophysics
    Type: GSFC.ABS.6691.2012
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