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  • ENERGY PRODUCTION AND CONVERSION  (6)
  • Atomic and molecular structure and dynamics  (3)
  • 1
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    Excited atomic energy levels in protactinium by resonance ionization spectroscopy (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-08-11
    Description: Author(s): Pascal Naubereit, Tina Gottwald, Dominik Studer, and Klaus Wendt We present high-resolution data of the single-excitation spectrum of protactinium, reaching slightly beyond the first-ionization threshold. Within this work, more than 1500 energy levels are recorded in different excitation energy ranges below 50 000 cm − 1 . Our experimental results show that the tabula... [Phys. Rev. A 98, 022505] Published Fri Aug 10, 2018
    Keywords: Atomic and molecular structure and dynamics ; high-precision measurements
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Intrinsic quantum chaos and spectral fluctuations within the protactinium atom (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-08-11
    Description: Author(s): Pascal Naubereit, Dominik Studer, Anna V. Viatkina, Andreas Buchleitner, Barbara Dietz, Victor V. Flambaum, and Klaus Wendt Recently, spectroscopic investigations of the protactinium atom applying resonant laser ionization spectroscopy revealed high-resolution data of the single-excitation spectrum of protactinium, reaching slightly beyond the first ionization potential [P. Naubereit et al. , preceding paper, Phys. Rev. ... [Phys. Rev. A 98, 022506] Published Fri Aug 10, 2018
    Keywords: Atomic and molecular structure and dynamics ; high-precision measurements
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Laser spectroscopy of the 1001-nm ground-state transition in dysprosium (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-10-11
    Description: Author(s): D. Studer, L. Maske, P. Windpassinger, and K. Wendt We present a direct excitation of the presumably ultranarrow 1001 − nm ground-state transition in atomic dysprosium. By using resonance ionization spectroscopy with pulsed Ti:sapphire lasers at a hot cavity laser ion source, we were able to measure the isotopic shifts in the 1001 − nm line between all s... [Phys. Rev. A 98, 042504] Published Wed Oct 10, 2018
    Keywords: Atomic and molecular structure and dynamics ; high-precision measurements
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Flywheel energy storage. II - Magnetically suspended superflywheel (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: This article, the second of a two part paper, describes the general design requirements for a flywheel energy storage system. A new superflywheel energy storage system, using a spokeless, magnetically suspended, composite material pierced disk rotor is proposed. The new system is configured around a permanent magnet ('flux biased') magnetic suspension system with active control in the radial direction and passive control in the axial direction. The storage ring is used as a moving rotor and electronic commutation of stationary armature coils is proposed. There is no mechanical contact with the rotating ring and long life and low run down losses are projected. A discussion of major components for a 10 kwh system is presented.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: International Journal of Mechanical Sciences; 19; 4, 19; 1977
    Format: text
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  • 5
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    Reaction wheels for kinetic energy storage (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: In contrast to all existing reaction wheel implementations, an order of magnitude increase in speed can be obtained efficiently if power to the actuators can be recovered. This allows a combined attitude control-energy storage system to be developed with structure mounted reaction wheels. The feasibility of combining reaction wheels with energy storage wwheels is demonstrated. The power required for control torques is a function of wheel speed but this energy is not dissipated; it is stored in the wheel. The I(2)R loss resulting from a given torque is shown to be constant, independent of the design speed of the motor. What remains, in order to efficiently use high speed wheels (essential for energy storage) for control purposes, is to reduce rotational losses to acceptable levels. Progress was made in permanent magnet motor design for high speed operation. Variable field motors offer more control flexibility and efficiency over a broader speed range.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Langley Research Center An Assessment of Integrated Flywheel System Technol.; p 329-340
    Format: application/pdf
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  • 6
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    Stirling cycle cryogenic cooler (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A long lifetime Stirling cycle cryogenic cooler particularly adapted for space applications is described. It consists of a compressor section centrally aligned end to end with an expansion section, and respectively includes a reciprocating compressor piston and displacer radially suspended in interconnecting cylindrical housings by active magnetic bearings and has adjacent reduced clearance regions so as to be in noncontacting relationship therewith and wherein one or more of these regions operate as clearance seals. The piston and displacer are reciprocated in their housings by linear drive motors to vary the volume of respectively adjacent compression and expansion spaces which contain a gaseous working fluid and a thermal regenerator to effect Stirling cycle cryogenic cooling.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: application/pdf
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  • 7
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    Mechanical capacitor (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A new energy storage system (the mechanical capacitor), using a spokeless magnetically levitated composite ring rotor, is described and design formulas for sizing the components are presented. This new system is configured around a permanent magnet (flux biased) suspension which has active servo control in the radial direction and passive control in the axial direction. The storage ring is used as a moving rotor and electronic commutation of the stationary armature coils is proposed. There is no mechanical contact with the rotating spokeless ring; therefore, long life and near zero rundown losses are projected. A 7-kW h system is sized to demonstrate feasibility. A literature review of flywheel energy storage systems is also presented and general formulas are developed for comparing rotor geometries.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TN-D-8185 , G-7639
    Format: application/pdf
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  • 8
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    Energy storage apparatus (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A high efficiency, flywheel type energy storage device which comprises an electronically commutated d.c. motor/generator unit having a massive flywheel rotor magnetically suspended around a ring shaped stator is presented. During periods of low energy demand, the storage devices were operated as a motor, and the flywheel motor was brought up to operating speed. Energy was drawn from the device functioning as a generator as the flywheel rotor rotated during high energy demand periods.
    Keywords: ENERGY PRODUCTION AND CONVERSION
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  • 9
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    Design of a motor-generator for an energy storage flywheel (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper examines motor/generator designs in which the rotor is integrated into the flywheel. Rotational loss considerations tend to dominate the design tradeoffs to maintain high system storage efficiency with a directly coupled unit. Some of the design alternatives are described as a guide to the experimental and analytical program needed to finalize a design.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: 1988 IECEC; Jul 31, 1988 - Aug 05, 1988; Denver, CO; United States
    Format: text
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