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  • FLUID MECHANICS AND HEAT TRANSFER  (3)
  • Condensed Matter: Electronic Properties, etc.  (2)
  • RESEARCH AND SUPPORT FACILITIES (AIR)  (2)
  • 1
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    Novel Electronic Behavior Driving NdNiO_{3} Metal-Insulator Transition (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-07-15
    Description: Author(s): M. H. Upton, Yongseong Choi, Hyowon Park, Jian Liu, D. Meyers, J. Chakhalian, S. Middey, Jong-Woo Kim, and Philip J. Ryan We present evidence that the metal-insulator transition (MIT) in a tensile-strained NdNiO 3 (NNO) film is facilitated by a redistribution of electronic density and that it neither requires Ni charge disproportionation nor a symmetry change [U. Staub et al. , Phys. Rev. Lett. 88 , 126402 (2002); R. Jara… [Phys. Rev. Lett. 115, 036401] Published Mon Jul 13, 2015
    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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    Orbital Engineering in Nickelate Heterostructures Driven by Anisotropic Oxygen Hybridization rather than Orbital Energy Levels (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-10-01
    Description: Author(s): G. Fabbris, D. Meyers, J. Okamoto, J. Pelliciari, A. S. Disa, Y. Huang, Z.-Y. Chen, W. B. Wu, C. T. Chen, S. Ismail-Beigi, C. H. Ahn, F. J. Walker, D. J. Huang, T. Schmitt, and M. P. M. Dean Resonant inelastic x-ray scattering is used to investigate the electronic origin of orbital polarization in nickelate heterostructures taking LaTiO 3 − LaNiO 3 − 3 × ( LaA l O 3 ) , a system with exceptionally large polarization, as a model system. We find that heterostructuring generates only minor changes in th… [Phys. Rev. Lett. 117, 147401] Published Fri Sep 30, 2016
    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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    The transfer of carbon fibers through a commercial aircraft water separator and air cleaner (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The fraction of carbon fibers passing through a water separator and an air filter was determined in order to estimate the proportion of fibers outside a closed aircraft that are transmitted to the electronics through the air conditioning system. When both devices were used together and only fibers 3 mm or larger were considered, a transfer function of .001 was obtained.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-159183
    Format: application/pdf
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  • 4
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    Correlation of laser velocimeter measurements over a wing with results of two prediction techniques (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The flow field at the center line of an unswept wing with an aspect ratio of eight was determined using a two dimensional viscous flow prediction technique for the flow field calculation, and a three dimensional potential flow panel method to evaluate the degree of two dimensionality achieved at the wing center line. The analysis was made to provide an acceptable reference for comparison with velocity measurements obtained from a fringe type laser velocimeter optics systems operating in the backscatter mode in the Langley V/STOL tunnel. Good agreement between laser velocimeter measurements and theoretical results indicate that both methods provide a true representation of the velocity field about the wing at angles of attack of 0.6 and 4.75 deg.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TP-1168 , L-11980
    Format: application/pdf
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  • 5
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    Laser velocimeter survey about a NACA 0012 wing at low angles of attack (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An investigation was conducted in the Langley V/STOL tunnel with a laser velocimeter to obtain measurements of airflow velocities about a wing at low angles of attack. The applicability of the laser velocimeter technique for this purpose in the V/STOL tunnel was demonstrated in this investigation with measurement precision bias calculated at -1.33 percent to 0.91 percent and a random uncertainty calculated at + or - 0.47 percent. Free stream measurements were obtained with this device and compared with velocity calculations from pitot static probe data taken near the laser velocimeter measurement location. The two measurements were in agreement to within 1 percent. Velocity measurement results about the centerline at 0.6 degrees angle of attack were typically those expected. At 4.75 degrees, the velocity measurements indicated that a short laminar separation bubble existed near the leading edge with an oscillating shear layer.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: NASA-TM-74040
    Format: application/pdf
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  • 6
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    Preliminary rotor wake measurements with a laser velocimeter (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A laser velocimeter (LV) was used to determine rotor wake characteristics. The effect of various fuselage widths and rotor-fuselage spacings on time averaged and detailed time dependent rotor wake velocity characteristics was defined. Definition of time dependent velocity characteristics was attempted with the LV by associating a rotor azimuth position with each velocity measurement. Results were discouraging in that no apparent time dependent velocity characteristics could be discerned from the LV measurements. Since the LV is a relatively new instrument in the rotor wake measurement field, the cause of this lack of periodicity is as important as the basic research objectives. An attempt was made to identify the problem by simulated acquisition of LV-type data for a predicted rotor wake velocity time history. Power spectral density and autocorrelation function estimation techniques were used to substantiate the conclusion that the primary cause of the lack of time dependent velocity characteristics was the nonstationary flow condition generated by the periodic turbulence level that currently exists in the open throat configuration of the wind tunnel.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-83246 , L-15080 , NAS 1.15:83246 , AVRADCOM-TR-82-B-7
    Format: application/pdf
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  • 7
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    Development of a controllable particle generator for LV seeding in hypersonic wind tunnels (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper describes the considerations that went into the development of a controllable particle generator for laser velocimeter seeding in a hypersonic wind tunnel operating at 3.45 million N/sq m, 533 K, and stream speed of about 1000 m/sec. Operating conditions determined the choice of a silicone oil as the material, and the requirement that the particle follow the flow within a certain accuracy range put constraints on the allowable particle size range. The principle of the particle generating device chosen was that of the LaMer generator, in which a liquid is first vaporized, mixed with the carrier gas, and then condensed under carefully controlled conditions. Preliminary results of studies on the effect of various apparatus parameters on the particle median diameter are given.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: Minnesota Symposium on Laser Anemometry; Oct 22, 1975 - Oct 24, 1975; Bloomington, MN
    Format: text
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