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  • Other Sources  (5)
  • 2000-2004  (5)
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  • 1
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    The Physical Origin of Galaxy Morphologies and Scaling Laws (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: We propose a numerical study designed to interpret the origin and evolution of galaxy properties revealed by space- and ground-based imaging and spectroscopical surveys. Our aim is to unravel the physical processes responsible for the development of different galaxy morphologies and for the establishment of scaling laws such as the Tully-Fisher relation for spirals and the Fundamental Plane of ellipticals. In particular, we plan to address the following major topics: (1) The morphology and observability of protogalaxies, and in particular the relationship between primordial galaxies and the z approximately 3 'Ly-break' systems identified in the Hubble Deep Field and in ground-based searches; (2) The origin of the disk and spheroidal components in galaxies, the timing and mode of their assembly, the corresponding evolution in galaxy morphologies and its sensitivity to cosmological parameters; (3) The origin and redshift evolution of the scaling laws that link the mass, luminosity size, stellar content, and metal abundances of galaxies of different morphological types. This investigation will use state-of-the-art N-body/gasdynamical codes to provide a spatially resolved description of the galaxy formation process in hierarchically clustering universes. Coupled with population synthesis techniques. our models can be used to provide synthetic 'observations' that can be compared directly with observations of galaxies both nearby and at cosmologically significant distances. This study will thus provide insight into the nature of protogalaxies and into the formation process of galaxies like our own Milky Way. It will also help us to assess the cosmological significance of these observations within the context of hierarchical theories of galaxy formation and will supply a theoretical context within which current and future observations can be interpreted.
    Keywords: Astrophysics
    Format: application/pdf
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  • 2
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    Aircraft engine with inter-turbine engine frame supported counter rotating low pressure turbine rotors (2003)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: An aircraft gas turbine engine assembly includes an inter-turbine frame axially located between high and low pressure turbines. Low pressure turbine has counter rotating low pressure inner and outer rotors with low pressure inner and outer shafts which are at least in part rotatably disposed co-axially within a high pressure rotor. Inter-turbine frame includes radially spaced apart radially outer first and inner second structural rings disposed co-axially about a centerline and connected by a plurality of circumferentially spaced apart struts. Forward and aft sump members having forward and aft central bores are fixedly joined to axially spaced apart forward and aft portions of the inter-turbine frame. Low pressure inner and outer rotors are rotatably supported by a second turbine frame bearing mounted in aft central bore of aft sump member. A mount for connecting the engine to an aircraft is located on first structural ring.
    Keywords: Aircraft Propulsion and Power
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  • 3
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    Pilot-Induced Oscillation Research: Status at the End of the Century (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The workshop "Pilot-Induced Oscillation Research: The Status at the End of the Century," was held at NASA Dryden Flight Research Center on 6-8 April 1999. The presentations at this conference addressed the most current information available, addressing regulatory issues, flight test, safety, modeling, prediction, simulation, mitigation or prevention, and areas that require further research. All presentations were approved for publication as unclassified documents with no limits on their distribution. This proceedings includes the viewgraphs (some with author's notes) used for thirty presentations that were actually given and two presentations that were not given because of time limitations. Four technical papers on this subject are also included.
    Keywords: Aircraft Stability and Control
    Type: NASA/CP-2001-210389/VOL2 , H-2407/VOL2 , NAS 1.55:210389/VOL2 , Pilot-Induced Oscillation Research: Status at the End of the Century; Apr 06, 1999 - Apr 08, 1999; Edwards, CA; United States
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  • 4
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    Pilot-Induced Oscillation Research: Status at the End of the Century (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The workshop "Pilot-Induced Oscillation Research: The Status at the End of the Century," was held at NASA Dryden Flight Research Center on 6-8 April 1999. The presentations at this conference addressed the most current information available, addressing regulatory issues, flight test, safety, modeling, prediction, simulation, mitigation or prevention, and areas that require further research. All presentations were approved for publication as unclassified documents with no limits on their distribution. This proceedings includes the viewgraphs (some with author's notes) used for thirty presentations that were actually given and two presentations that were not given because of time limitations. Four technical papers on this subject are also included.
    Keywords: Aircraft Stability and Control
    Type: NASA/CP-2001-210389/VOL3 , H-2407/VOL3 , H-2419/VOL3 , NAS 1.55:210389/VOL3 , Pilot-Induced Oscillation Research: Status at the End of the Century; Apr 06, 1999 - Apr 08, 1999; Edwards, CA; United States
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  • 5
    facet.materialart.
    Unknown
    Pilot-Induced Oscillation Research: The Status at the End of the Century (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The workshop "Pilot-Induced Oscillation Research: The Status at the End of the Century," was held at NASA Dryden Flight Research Center on 6-8 April 1999. The presentations at this conference addressed the most current information available, addressing regulatory issues, flight test, safety, modeling, prediction, simulation, mitigation or prevention, and areas that require further research. All presentations were approved for publication as unclassified documents with no limits on their distribution. This proceedings includes the viewgraphs (some with author's notes) used for thirty presentations that were actually given and two presentations that were not given because of time limitations. Four technical papers on this subject are also included.
    Keywords: Aircraft Stability and Control
    Type: NASA/CP-2001-210389/VOL1 , NAS 1.55:210389/VOL1 , H-2407 , Pilot-Induced Oscillation (PIO); Apr 06, 1999 - Apr 08, 1999; Edwards, CA; United States
    Format: application/pdf
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