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  • Electronics and Electrical Engineering  (8)
  • Space Communications, Spacecraft Communications, Command and Tracking  (8)
  • Condensed Matter: Electronic Properties, etc.  (5)
  • 2010-2014  (21)
  • 2000-2004
  • 1935-1939
  • 1
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    Majorana Fermions in Vortex Lattices (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-09-26
    Description: Author(s): Rudro R. Biswas We consider Majorana fermions tunneling among an array of vortices in a 2D chiral p -wave superconductor or equivalent material. The amplitude for Majorana fermions to tunnel between a pair of vortices is found to necessarily depend on the background superconducting phase profile; it is found to be p... [Phys. Rev. Lett. 111, 136401] Published Wed Sep 25, 2013
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Two-Dimensional Superfluid Density in an Alkali Metal-Organic Solvent Intercalated Iron Selenide Superconductor Li(C_{5}H_{5}N)_{0.2}Fe_{2}Se_{2} (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-03-29
    Description: Author(s): P. K. Biswas, A. Krzton-Maziopa, R. Khasanov, H. Luetkens, E. Pomjakushina, K. Conder, and A. Amato We report the low-temperature electronic and magnetic properties of the alkali metal-organic solvent intercalated iron selenide superconductor Li(C 5 H 5 N) 0.2 Fe 2 Se 2 using muon-spin-spectroscopy measurements. The zero-field muon spin relaxation ( μ SR) results indicate that nearly half of the sample is ma... [Phys. Rev. Lett. 110, 137003] Published Thu Mar 28, 2013
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    STM Imaging of Impurity Resonances on Bi_{2}Se_{3} (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-05-16
    Description: Author(s): Zhanybek Alpichshev, Rudro R. Biswas, Alexander V. Balatsky, J. G. Analytis, J.-H. Chu, I. R. Fisher, and A. Kapitulnik In this Letter we present detailed study of the density of states near defects in Bi 2 Se 3 . In particular, we present data on the commonly found triangular defects in this system. While we do not find any measurable quasiparticle scattering interference effects, we do find localized resonances, which ... [Phys. Rev. Lett. 108, 206402] Published Tue May 15, 2012
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    First-Order Reorientation Transition of the Flux-Line Lattice in CaAlSi (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-02-14
    Description: Author(s): P. K. Biswas, M. R. Lees, G. Balakrishnan, D. Q. Liao, D. S. Keeble, J. L. Gavilano, N. Egetenmeyer, C. D. Dewhurst, and D. McK. Paul The flux-line lattice in CaAlSi has been studied by small-angle neutron scattering. A well-defined hexagonal flux-line lattice is seen just above H c 1 in an applied field of only 54 Oe. A 30° reorientation of this vortex lattice has been observed in a very low field of 200 Oe. This reorientation tran... [Phys. Rev. Lett. 108, 077001] Published Mon Feb 13, 2012
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Magnetic Nonuniformity and Thermal Hysteresis of Magnetism in a Manganite Thin Film (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-02-18
    Description: Author(s): Surendra Singh, M. R. Fitzsimmons, T. Lookman, J. D. Thompson, H. Jeen, A. Biswas, M. A. Roldan, and M. Varela We measured the chemical and magnetic depth profiles of a single crystalline (La 1-x Pr⁡ x ) 1-y Ca y MnO 3-δ ( x =0.52±0.05 , y =0.23±0.04 , δ =0.14±0.10 ) film grown on a NdGaO 3 substrate using x-ray reflectometry, electron microscopy, electron energy-loss spectroscopy, and polarized neutron reflectometry. Our da... [Phys. Rev. Lett. 108, 077207] Published Fri Feb 17, 2012
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    A Model-based Prognostics Methodology for Electrolytic Capacitors Based on Electrical Overstress Accelerated Aging (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-27
    Description: A remaining useful life prediction methodology for electrolytic capacitors is presented. This methodology is based on the Kalman filter framework and an empirical degradation model. Electrolytic capacitors are used in several applications ranging from power supplies on critical avionics equipment to power drivers for electro-mechanical actuators. These devices are known for their comparatively low reliability and given their criticality in electronics subsystems they are a good candidate for component level prognostics and health management. Prognostics provides a way to assess remaining useful life of a capacitor based on its current state of health and its anticipated future usage and operational conditions. We present here also, experimental results of an accelerated aging test under electrical stresses. The data obtained in this test form the basis for a remaining life prediction algorithm where a model of the degradation process is suggested. This preliminary remaining life prediction algorithm serves as a demonstration of how prognostics methodologies could be used for electrolytic capacitors. In addition, the use degradation progression data from accelerated aging, provides an avenue for validation of applications of the Kalman filter based prognostics methods typically used for remaining useful life predictions in other applications.
    Keywords: Electronics and Electrical Engineering
    Type: ARC-E-DAA-TN3987 , Annual Conference of the PHM Society 2011; 25-29 Sept. 2011; Montreal/Canada; United States
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  • 7
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    Optical Communications Telescope Laboratory (OCTL) Support of Space to Ground Link Demonstrations (2014)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The NASA/JPL Optical Communication Telescope Laboratory (OCTL) was built for dedicated research and development toward supporting free-space laser communications from space. Recently, the OCTL telescope was used to support the Lunar Laser Communication Demonstration (LLCD) from the Lunar Atmospheric Dust Environment Explorer (LADEE) spacecraft and is planned for use with the upcoming Optical Payload for Lasercomm Science (OPALS) demonstration from the International Space Station (ISS). The use of OCTL to support these demonstrations is discussed in this report. The discussion will feed forward to ongoing and future space-to-ground laser communications as it advances toward becoming an operational capability.
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: SpaceOps 2014; May 05, 2014 - May 09, 2014; Pasadena, CA; United States
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  • 8
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    Physics Based Electrolytic Capacitor Degradation Models for Prognostic Studies under Thermal Overstress (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Electrolytic capacitors are used in several applications ranging from power supplies on safety critical avionics equipment to power drivers for electro-mechanical actuators. This makes them good candidates for prognostics and health management research. Prognostics provides a way to assess remaining useful life of components or systems based on their current state of health and their anticipated future use and operational conditions. Past experiences show that capacitors tend to degrade and fail faster under high electrical and thermal stress conditions that they are often subjected to during operations. In this work, we study the effects of accelerated aging due to thermal stress on different sets of capacitors under different conditions. Our focus is on deriving first principles degradation models for thermal stress conditions. Data collected from simultaneous experiments are used to validate the desired models. Our overall goal is to derive accurate models of capacitor degradation, and use them to predict performance changes in DC-DC converters.
    Keywords: Electronics and Electrical Engineering
    Type: ARC-E-DAA-TN5005 , First European Conference of the Prognostics and Health; Jul 03, 2012; Dresden; Germany
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  • 9
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    Prognostics of Power Electronics, Methods and Validation Experiments (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Abstract Failure of electronic devices is a concern for future electric aircrafts that will see an increase of electronics to drive and control safety-critical equipment throughout the aircraft. As a result, investigation of precursors to failure in electronics and prediction of remaining life of electronic components is of key importance. DC-DC power converters are power electronics systems employed typically as sourcing elements for avionics equipment. Current research efforts in prognostics for these power systems focuses on the identification of failure mechanisms and the development of accelerated aging methodologies and systems to accelerate the aging process of test devices, while continuously measuring key electrical and thermal parameters. Preliminary model-based prognostics algorithms have been developed making use of empirical degradation models and physics-inspired degradation model with focus on key components like electrolytic capacitors and power MOSFETs (metal-oxide-semiconductor-field-effect-transistor). This paper presents current results on the development of validation methods for prognostics algorithms of power electrolytic capacitors. Particularly, in the use of accelerated aging systems for algorithm validation. Validation of prognostics algorithms present difficulties in practice due to the lack of run-to-failure experiments in deployed systems. By using accelerated experiments, we circumvent this problem in order to define initial validation activities.
    Keywords: Electronics and Electrical Engineering
    Type: ARC-E-DAA-TN7926 , IEEE Autotestcon; Sep 10, 2012 - Sep 12, 2012; Anaheim, CA; United States
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  • 10
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    Mars Mission Scenario: Data Volume and PDT Notes (2012)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Objectives of this work are: (1) Investigate methods for quantifying the value of interoperability for deep space missions: A network of optical receive stations Each one potentially owned by a different space agency. Reduces overall cost to any individual agency Provides geographically diverse locations to mitigate weather problems (clouds, wind, rain, dust, etc.) (2) Metrics: a. Total data volume returned over mission duration b. Percent data transferred (PDT) or something similar.
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: European Space Agency Optical Link Study Group; Apr 01, 2012; Darmstadt; Germany
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