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  • 1
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    Simple analytical Green's functions for ray perturbations in layered media (1993)
    In:  Geophys. J. Int., Edmonton, Conseil de l'Europe, vol. 115, no. 3, pp. 1137-1142, pp. B10410, (ISSN: 1340-4202)
    Details
    Publication Date: 1993
    Keywords: Seismology ; Layers ; Source ; Wave propagation ; GJI
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Thermodynamic evaluation of transonic compressor rotors using the finite volume approach (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Research at NASA Lewis Research Center gave the opportunity to incorporate new control volumes in the Denton 3-D finite-volume time marching code. For duct flows, the new control volumes require no transverse smoothing and this allows calculations with large transverse gradients in properties without significant numerical total pressure losses. Possibilities for improving the Denton code to obtain better distributions of properties through shocks were demonstrated. Much better total pressure distributions through shocks are obtained when the interpolated effective pressure, needed to stabilize the solution procedure, is used to calculate the total pressure. This simple change largely eliminates the undershoot in total pressure down-stream of a shock. Overshoots and undershoots in total pressure can then be further reduced by a factor of 10 by adopting the effective density method, rather than the effective pressure method. Use of a Mach number dependent interpolation scheme for pressure then removes the overshoot in static pressure downstream of a shock. The stability of interpolation schemes used for the calculation of effective density is analyzed and a Mach number dependent scheme is developed, combining the advantages of the correct perfect gas equation for subsonic flow with the stability of 2-point and 3-point interpolation schemes for supersonic flow.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-176428 , NAS 1.26:176428 , JM/85-11
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    An Overview of Electrodynamic Tether Performance in the Jovian System (1998)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The Jovian magnetosphere with its strong magnetic field and the rapid rotation of the planet present new opportunities and challenges for the use of electrodynamic tethers. An overview of the basic plasma physics properties of an electrodynamic tether moving through the Jovian magnetosphere is examined. Tether use for both propulsion and power generation are considered. Close to the planet, tether propulsive forces are found to be as high as 50 Newtons and power levels as high as 1 million Watts.
    Keywords: Spacecraft Design, Testing and Performance
    Type: Tether Technology Interchange Meeting; 335-344; NASA/CP-1998-206900
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Combustion Synthesis of Advanced Porous Materials in Microgravity Environment (1999)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Combustion synthesis, otherwise known as self-propagating high temperature synthesis (SHS), can be used to produce engineered advanced porous material implants which offer the possibility for bone ingrowth as well as a permanent structure framework for the long-term replacement of bone defects. The primary advantage of SHS is based on its rapid kinetics and favorable energetics. The structure and properties of materials produced by SHS are strongly dependent on the combustion reaction conditions. Combustion reaction conditions such as reaction stoichiometry, particle size, green density, the presence and use of diluents or inert reactants, and pre-heating of the reactants, will affect the exothermicity of the reaction. A number of conditions must be satisfied in order to obtain high porosity materials: an optimal amount of liquid, gas and solid phases must be present in the combustion front. Therefore, a balance among these phases at the combustion front must be created by the SHS reaction to successfully engineer a bone replacement material system. Microgravity testing has extended the ability to form porous products. The convective heat transfer mechanisms which operate in normal gravity, 1 g, constrain the combustion synthesis reactions. Gravity also acts to limit the porosity which may be formed as the force of gravity serves to restrict the gas expansion and the liquid movement during reaction. Infiltration of the porous product with other phases can modify both the extent of porosity and the mechanical properties.
    Keywords: Materials Processing
    Type: Fifth International Microgravity Combustion Workshop; 145-148; NASA/CP-1999-208917
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Topographic Evaluation of Mars 2001 Candidate Landing Sites: A MGS-Viking Synergistic Study (1999)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: One of the greatest unresolved issues concerns the evolution of Mars early in its history; during the time period that accretion was winding down but the frequency of impacting debris was still heavy. Ancient cratered terrain that has only been moderately modified since the period of heavy bombardment covers about a quarter of the planet's surface but the environment during its formation is still uncertain. This terrain was dominantly formed by cratering. But unlike on the airless Moon, the impacting craters were strongly modified by other contemporary surface processes that have produced distinctive features such as 1) dendritic channel networks, 2) rimless, flatfloored craters, 3) obliteration of most craters smaller than a few kilometers in diameter (except for post heavy-bombardment impacts), and 4) smooth intercrater plains. The involvement of water in these modification processes seems unavoidable, but interpretations of the surface conditions on early Mars range from the extremes of 1) the "cold" model which envisions a thin atmosphere and surface temperatures below freezing except for local hydrothermal springs; and 2) the "warm" model, which invokes a thick atmosphere, seasonal temperatures above freezing in temperate and equatorial regions, and at least occasional precipitation as part of an active hydrological cycle. The nature of hydrologic cycles, if they occurred on Mars, would have been critically dependent on the environment. The resolution of where along this spectrum the actual environment of early Mars occurred is clearly a major issue, particularly because the alternate scenarios have much different implications about the possibility that life might have evolved on Mars.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Second Mars Surveyor Landing Site Workshop; 67-68
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    RAPID ALGEBRAIC TECHNIQUES FOR SOLVING AUTOMATIC CONTROL EQUATIONS (1962)
    In:  CASI
    Details
    Publication Date: 2009-11-16
    Description: Rapid techniques for solving automatic control equations
    Keywords: MATHEMATICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Magnetic properties of materials (1965)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Direct current induction method for measuring magnetic permeabilities of certain alloy samples
    Keywords: MATERIALS, METALLIC
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Impact Cratering: A Critical Jovian Icy Moons Science Objective (2003)
    In:  CASI
    Details
    Publication Date: 2004-10-30
    Description: Impact craters perform two vital functions in planetary history and evolution. They date the surface. They probe the interior. Voyager and Galileo based studies reveal that impact crater morphology is fundamentally different on icy and rocky bodies. Also, differences have been discovered among the icy satellites that are probably related to thermal state of the ice shell. Much of this is related to the strong temperature dependence of ice rheology on temperature, and the much weaker strength of ices in general. Depth diameter studies of impact craters show very clear breaks associated with morphologic transitions. In fact, some larger craters appear to be shallower than smaller craters. These transitions may be related to rheologic transitions at depth within the outer icy shells. Unfortunately, only a few of the larger impact craters can be mapped topographically and some of these were not observed at high resolution. It is therefore highly desirable to determine the shapes of larger impact features on these satellites.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Forum on Concepts and Approaches for Jupiter Icy Moons Orbiter; 69; LPI-Contrib-1163
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Genesis of Atlantic Lows Experiment (GALE) - An overview (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The field phase of the Genesis of Atlantic Lows Experiment (GALE) was conducted from 15 January to 15 March 1986. The objectives of GALE were to study mesoscale and air-sea interaction processes in East Coast winter storms, with particular emphasis on their contributions to cyclogenesis. This project area, specail observing systems, and field operations are described. There were thirteen special observing periods during the field phase including eight cases of cyclogenesis. Meterological and oceanographic phenomena on which special observations were collected include: cyclogenesis, rainbands, cold fronts, coastal fronts, cold-air damming, jets streaks, tropopause folding, low-level jets, cold-air outbreaks, lightning and marine boundary layer interactions with Gulf Stream and mid-shelf oceanic fronts. Preliminary research findings and operational implications are presented. GALE data documents are listed. The GALE data set is open to all interested scientists.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: American Meteorological Society, Bulletin (ISSN 0003-0007); 69; 148-160
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Correlation of the deply technique with the ultrasonic imaging of impact damage in graphite/epoxy composites (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A quantitative ultrasonic technique for the nondestructive assessment of impact damage is described. The method, which involves digitizing the entire backscattered ultrasonic wave from a sample, was applied to two test panels removed from a 16-ply graphite/epoxy laminate and impacted with an aluminum ball fired at a velocity of 150 ft/sec. The results of the ultrasonic NDE were compared with the results obtained using the destructive deply technique of Freeman (1984). The NDE method provides through-the-thickness information on damage and only requires access to a single side of the material, while the deply technique gives exact information on the actual damage. Good quantitative agreement between the two techniques was obtained.
    Keywords: QUALITY ASSURANCE AND RELIABILITY
    Format: text
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