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  • 1
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    ABSORPTION OF THERMAL RADIATION IN V-GROOVE CAVITIES (1961)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Thermal radiation absorption in v-groove cavities
    Keywords: NAVIGATION
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    ABSORPTION OF THERMAL RADIATION IN A V-GROOVE CAVITY (1962)
    In:  Other Sources
    Details
    Publication Date: 2011-08-10
    Description: Analysis of energy absorbed when radiation from an external source enters a v-groove cavity
    Keywords: GEOPHYSICS
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    NASA TECHNICAL REPORTS
  • 3
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    Flow formed by spanwise gaps between roughness elements (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Measurements of the three mean velocity components and the three Reynolds shear stresses were made in the region downstream of gaps between wall-mounted roughness elements of square cross section and high aspect ratio in a thick turbulent boundary layer. The effect of small and large gaps was studied in a wind tunnel at a Reynolds number of 3600, based on obstacle height and free-stream velocity. The small gap produces retardation of the gap flow as with a two-dimensional roughness element, but a definite interaction between gap and wake flows is observed. The interaction is more intense for the large gap than for the small. Both gaps generate a secondary crossflow which moves fluid away from the centerline in the wall region and toward the centerline in the outer (y greater than 1.5H) region.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: ASME, Transactions, Journal of Fluids Engineering (ISSN 0098-2202); 107; 385-391
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  • 4
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    SHORTER COMMUNICATION. ABSORPTION OF THERMAL RADIATION IN A V-GROOVE CAVITY (1962)
    In:  CASI
    Details
    Publication Date: 2019-05-11
    Description: Absorption of thermal radiation in v-groove cavity
    Keywords: PHYSICS, GENERAL
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    NASA TECHNICAL REPORTS
  • 5
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    Wakes from arrays of buildings (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Experiments were carried out in a small wind tunnel in which atmospheric flow around buildings was simulated. Arrays of one, two, three, and four model buildings were tested, and wake profiles of velocity and turbulence were measured. The data indicate the effect of the buildings on the wind environment encountered by aircraft during landing or takeoff operations. It was possible to use the results to locate the boundaries of the air regions affected by the obstacles and to recommend preferred arrangements of buildings to maximize light safety.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-170666 , NAS 1.26:170666
    Format: application/pdf
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  • 6
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    Wind tunnel measurements of three-dimensional wakes of buildings (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Measurements relevant to the effect of buildings on the low level atmospheric boundary layer are presented. A wind tunnel experiment was undertaken to determine the nature of the flow downstream from a gap between two transversely aligned, equal sized models of rectangular cross section. These building models were immersed in an equilibrium turbulent boundary layer which was developed on a smooth floor in a zero longitudinal pressure gradient. Measurements with an inclined (45 degree) hot-wire were made at key positions downstream of models arranged with a large, small, and no gap between them. Hot-wire theory is presented which enables computation of the three mean velocity components, U, V and W, as well as Reynolds stresses. These measurements permit understanding of the character of the wake downstream of laterally spaced buildings. Surface streamline patterns obtained by the oil film method were used to delineate the separation region to the rear of the buildings for a variety of spacings.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-CR-3565 , M-379 , NAS 1.26:3565
    Format: application/pdf
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  • 7
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    Monolithically integrated two-dimensional arrays of optoelectronic threshold devices for neural network applications (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A monolithic 10 x 10 two-dimensional array of 'optical neuron' optoelectronic threshold elements for neural network applications has been designed, fabricated, and tested. Overall array dimensions are 5 x 5 mm, while the individual neurons, composed of an LED that is driven by a double-heterojunction bipolar transistor, are 250 x 250 microns. The overall integrated structure exhibited semiconductor-controlled rectifier characteristics, with a breakover voltage of 75 V and a reverse-breakdown voltage of 60 V; this is attributable to the parasitic p-n-p transistor which exists as a result of the sharing of the same n-AlGaAs collector between the transistors and the LED.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Laser Diode Technology and Applications Meeting; Jan 18, 1989 - Jan 20, 1989; Los Angeles, CA; United States
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  • 8
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    Wakes from arrays of buildings (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Experiments were carried out in a small wind tunnel in which atmospheric flow around buildings was simulated. Arrays of one, two, three, and four model buildings were tested, and wake profiles of velocity and turbulence were measured. The data indicate the effect of the buildings on the wind environment encountered by aircraft during landing or takeoff operations. It was possible to use the results to locate the boundaries of the air regions affected by the obstacles and to recommend preferred arrangement of buildings to maximize light safety. Previously announced in STAR as N83-14430
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Conference on Aerospace and Aeronautical Meteorology; Jun 06, 1983 - Jun 09, 1983; Omaha, NE
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  • 9
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    Optoelectronic Integrated Circuits For Neural Networks (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Many threshold devices placed on single substrate. Integrated circuits containing optoelectronic threshold elements developed for use as planar arrays of artificial neurons in research on neural-network computers. Mounted with volume holograms recorded in photorefractive crystals serving as dense arrays of variable interconnections between neurons.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-17652 , NASA Tech Briefs (ISSN 0145-319X); 14; 5; P. 28
    Format: text
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