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  • 1
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    Observation of shear wave splitting from natural events: south moat of Long Valley Caldera, California, June 29 to August 12, 1982 (1990)
    In:  J. Geophys. Res., Washington, D.C., AGU, vol. 95, no. 5, pp. 11179-11195, pp. 1489, (ISSN: 1340-4202)
    Details
    Publication Date: 1990
    Keywords: AnisotropyS ; Shear waves ; Earthquake ; Earthquake precursor: prediction research ; Earthquake precursor: stresses ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Effect of simulated weightlessness on the postural response of microvascular cutaneous blood flow (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The effect of simulated weightlessness (1 week of bed rest) on the response of cutaneous microcirculatory blood flow to postural changes was investigated by measuring rates of the cutaneous blood flow in the central forehead and in the dorsum of the left foot in subjects who were tested in -6 deg head-down tilt (HDT) and 60-deg head-up tilt (HUT) before and after the week of bed rest. It was found that, when the subjects were moved from HUT to HDT before the bed rest period, the forehead cutaneous blood flow increased (in comparison to no-tilt baseline), due to increased arterial pressure, by about 26 percent, and that the response was the same on the first and the second day after 1 week of bed rest. The cutaneous blood flow in the dorsum of the foot decreased by about 46 percent in response to tilting from HDT to HUT both before and after bedrest.
    Keywords: AEROSPACE MEDICINE
    Type: Physiologist, Supplement (ISSN 0031-9376); 33; S-54
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    3-D components of a biological neural network visualized in computer generated imagery. II - Macular neural network organization (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Computer-assisted reconstructions of small parts of the macular neural network show how the nerve terminals and receptive fields are organized in 3-dimensional space. This biological neural network is anatomically organized for parallel distributed processing of information. Processing appears to be more complex than in computer-based neural network, because spatiotemporal factors figure into synaptic weighting. Serial reconstruction data show anatomical arrangements which suggest that (1) assemblies of cells analyze and distribute information with inbuilt redundancy, to improve reliability; (2) feedforward/feedback loops provide the capacity for presynaptic modulation of output during processing; (3) constrained randomness in connectivities contributes to adaptability; and (4) local variations in network complexity permit differing analyses of incoming signals to take place simultaneously. The last inference suggests that there may be segregation of information flow to central stations subserving particular functions.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Acta Oto-Laryngologica (ISSN 0001-6489); 109; 235-244
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Aircraft automatic flight control system with model inversion (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A simulator study was conducted to verify the advantages of a Newton-Raphson model-inversion technique as a design basis for an automatic trajectory control system in an aircraft with highly nonlinear characteristics. The simulation employed a detailed mathematical model of the aerodynamic and propulsion system performance characteristics of a vertical-attitude takeoff and landing tactical aircraft. The results obtained confirm satisfactory control system performance over a large portion of the flight envelope. System response to wind gusts was satisfactory for various plausible combinations of wind magnitude and direction.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Post-launch operations and data production (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Postlaunch operations scheduled in connection with the October 5, 1990, launch of Space Shuttle Discovery with the Ulysses payload are detailed. A summary is presented of postlaunch events up to and including the separation of Ulysses from Discovery, providing a timeline for the upper-stage burn and spacecraft separation. A timeline is also provided for the payload switch-on. Initial in-orbit and routine operations are discussed and missions-operations organization, the data ground segment, and Ulysses data production are considered.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: ESA Bulletin (ISSN 0376-4265); 63, A
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    3-D components of a biological neural network visualized in computer generated imagery. I - Macular receptive field organization (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Computer-assisted, 3-dimensional reconstructions of macular receptive fields and of their linkages into a neural network have revealed new information about macular functional organization. Both type I and type II hair cells are included in the receptive fields. The fields are rounded, oblong, or elongated, but gradations between categories are common. Cell polarizations are divergent. Morphologically, each calyx of oblong and elongated fields appears to be an information processing site. Intrinsic modulation of information processing is extensive and varies with the kind of field. Each reconstructed field differs in detail from every other, suggesting that an element of randomness is introduced developmentally and contributes to endorgan adaptability.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Acta Oto-Laryngologica (ISSN 0001-6489); 109; 83-92
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    The Cosmic Background Explorer (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The Cosmic Background Explorer (CBE), NASA's cosmological satellite which will observe a radiative relic of the big bang, is discussed. The major questions connected to the big bang theory which may be clarified using the CBE are reviewed. The satellite instruments and experiments are described, including the Differential Microwave Radiometer, which measures the difference between microwave radiation emitted from two points on the sky, the Far-Infrared Absolute Spectrophotometer, which compares the spectrum of radiation from the sky at wavelengths from 100 microns to one cm with that from an internal blackbody, and the Diffuse Infrared Background Experiment, which searches for the radiation from the earliest generation of stars.
    Keywords: SPACE RADIATION
    Type: Scientific American (ISSN 0036-8733); 262; 132-139
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Contact angle determination procedure and detection of an invisible surface film (1990)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: The contact angle value, i.e., the tangent angle of liquid resting on a planar solid surface, is a basic parameter which can be applied to a wide range of applications. The goal is to provide a basic understanding of the contact angle measurement technique and to present a simple illustration that can be applied as a quality control method; namely, detection of a surface contaminant which exists on a surface that appears clean to the unaided eye. The equipment and experimental procedures are detailed.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA, Langley Research Center, National Educators' Workshop: Update 1988. Standard Experiments in Engineering Materials Science and Technology; p 13-26
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Additive evaluation criteria for aircraft noise (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The occurrence of unexpected aircraft noise events will frequently evoke intense complaints about annoyance over such events. It is recognized that the relationship between the volume of complaints and the corresponding maximum noise levels does in fact depend on the circumstances of the complainants and the time of year. The frequency of occurrence of the respective noise events is also a factor. The possible practical value of the addition of the maximal noise level, to the well-known cumulative noise descriptors L(sub eq), L(sub dn), etc. may be considered. One might start by considering the difference between the L(sub eq) and the average maximal noise level of the twenty loudest single noise events on an average day. A somewhat less sharply focused consideration of the maximum noise levels was adopted. In that standard the scope of noise-mitigation measures is defined generally with reference to L(sub eq). If the average maximal noise level L(sub max) of the entire aircraft fleet mix exceeds the L(sub eq) by more than 20 dB(A) and if more than 20 daily aircraft noise events exceed the L(sub eq) than the difference L(sub max)-20 becomes the key criterion for noise-mitigation measures. A statistical correlation of a large number of data from aircraft-noise-monitoring sensors located both directly underneath and laterally disposed to an aircraft flight-path has supplied a basis for the determination of the distribution of the maximal noise levels about the average value, L(sub max), of each type of aircraft. This distribution is given for the takeoff climb and for the landing approach.
    Keywords: ACOUSTICS
    Type: NASA, Langley Research Center, FAA(NASA En Route Noise Symposium; p 223-226
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Development of a versatile laser light scattering instrument (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A versatile laser light scattering (LLS) instrument is developed for use in microgravity to measure microscopic particles of 30 A to above 3 microns. Since it is an optical technique, LLS does not affect the sample being studied. A LLS instrument built from modules allows several configurations, each optimized for a particular experiment. The multiangle LLS instrument can be mounted in the rack in the Space Shuttle and on Space Station Freedom. It is possible that a Space Shuttle glove-box and a lap-top computer containing a correlator card can be used to perform a number of experiments and to demonstrate the technology needed for more elaborate investigations. This offers simple means of flying a great number of experiments without the additional requirements of full-scale flight hardware experiments.
    Keywords: LASERS AND MASERS
    Type: NASA-CR-182474 , NAS 1.26:182474
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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