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  • ENERGY PRODUCTION AND CONVERSION  (1)
  • Electronic structure and strongly correlated systems  (1)
  • 1
    facet.materialart.
    Unknown
    Anomalous bulk modulus in vanadate spinels (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-10-25
    Description: Author(s): Z.-Y. Li, X. Li, J.-G. Cheng, L. G. Marshall, X.-Y. Li, A. M. dos Santos, W.-G. Yang, J. J. Wu, J.-F. Lin, G. Henkelman, T. Okada, Y. Uwatoko, H. B. Cao, H. D. Zhou, J. B. Goodenough, and J.-S. Zhou All single-valent oxide spinels are insulators. The relatively small activation energy in the temperature dependence of resistivity in vanadate spinels led to the speculation that the spinels are near the crossover from localized to itinerant electronic behavior, and the crossover could be achieved … [Phys. Rev. B 94, 165159] Published Mon Oct 24, 2016
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
    facet.materialart.
    Unknown
    Performance and aerodynamic braking of a horizontal-axis wind turbine from small-scale wind tunnel tests (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Wind tunnel tests of three 20" diameter, zero twist, zero pitch wind turbine rotor models were conducted in a 7' x 10' wind tunnel to determine the performance of such rotors with NACA 23024 and NACA 64 sub 3-621 airfoil sections. Aerodynamic braking characteristics of a 38% span, 30% chord, vented aileron configuration were measured on the NACA 23024 rotor. Surface flow patterns were observed using fluorescent mini-tufts attached to the suction side of the rotor blades. Experimental results with and without ailerons are compared to predictions using airfoil section data and a momentum performance code. Results of the performance studies show that the 64 sub 3-621 rotor produces higher peak power than the 23024 rotor for a given rotor speed. Analytical studies, however, indicate that the 23024 should produce higher power. Transition strip experiments show that the 23024 rotor is much more sensitive to roughness than the 64 sub 3-621 rotor. These trends agree with analytical predictions. Results of the aileron test show that this aileron, when deflected, produces a braking torque at all tip speed ratios. In free wheeling coastdowns the rotor blade stopped, then rotated backward at a tip speed ratio of -0.6.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-180812 , DOE/NASA/3277-4 , NAS 1.26:180812
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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