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  • Other Sources  (135)
  • METALLIC MATERIALS  (68)
  • INSTRUMENTATION AND PHOTOGRAPHY  (67)
  • 1985-1989  (135)
  • 1
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    The vector magnetograph of the Sayan Solar Observatory (1985)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The problem of choosing an optimum scheme for the electrooptical analyzer of polarization and related control principles are discussed. An electrooptical deflector, which is advantageously used to employ a single photodetector and to remove systematic errors inherent in magnetographs with two photodetectors in the wings of the line is discussed, as well as adjustment errors of optical elements of the polarization analyzer and errors of control voltages. A method for measuring the telescope's polarization matrix, reduction of magnetographic measurements for instrumental polarization and calibration of magnetograph channels are examined. Questions of evaluating scattered light and of reducing magnetic field measurements are also considered as a computational procedure for the magnetic field vector parameters is briefly outlined. Computer control of the solar magnetograph and of the processing and control system software is discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Marshall Space Flight Center Meas. of Solar Vector Magnetic Fields; p 231-256
    Format: text
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  • 2
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    Analysis of NiAlTa precipitates in beta-NiAl + 2 at. pct Ta alloy (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Results are reported from experiments performed to identify the precipitates, and their orientation in the matrix, in a beta-NiAl alloy containing 2 at. pct. Ta after undergoing creep test at 1300 K. Test specimens formed by extruding hot powders were compressed at 1300 K for about 50 hr at a strain rate averaging 6/1 million per sec. The specimens were then thinned and examined under an electron microscope and by X-ray diffractometry. An intermetallic NiAlTa compound with a hexagonal Cl4 structure appeared as second phase precipitates in the samples, exhibiting plate-like shapes and a habit plane close to (012). The prism planes of the hexagonal NiAlTa precipitates paralleled the closest packed planes in the cubic beta-NiAl matrix.
    Keywords: METALLIC MATERIALS
    Type: Scripta Metallurgica (ISSN 0036-9748); 21; 283-288
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  • 3
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    Influence of precipitate morphology on intermediate temperature creep properties of a nickel-base superalloy single crystal (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The relative creep behavior of cuboidal (as-heat treated) and rafted (precrept at 1000 C) gamma-prime microstructures in the single-crystal Ni-based superalloy NASAIR 100 at 760 C was investigated using SEM and TEM examinations of materials at various stages of creep. It was found that, at high applied stresses, the crystals with cuboidal gamma-prime structure had both lower minimum creep rates and longer rupture lives than the crystals with lamellar gamma-prime. At lower stress levels, the initially cuboidal gamma-prime microstructure maintained a lower creep rate, but exhibited a similar rupture life compared to the prerafted crystals.
    Keywords: METALLIC MATERIALS
    Type: Metallurgical Transactions A - Physical Metallurgy and Materials Science (ISSN 0360-2133); 20A; 133-141
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  • 4
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    Automatic processing system for shadowgraph and interference patterns (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The design and operation of an automatic system for the processing of shadowgraph and interference images are described. The system includes a two-coordinate processing table with an optical system for the projection of transparent images onto the photodetector, an image filter in the photodetector field, and a device for controlling the movement of the table and transmitting information to the minicomputer.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-88525 , NAS 1.15:88525
    Format: application/pdf
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  • 5
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    Side branch morphology and coarsening in directionally solidified Pb-8.4 at. pct Au (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The scaling relationships among the morphological features associated with the formation of perturbations (side branches) in the intercellular regions of a directionally solidified Pg-8.4 at. pct Au alloy were investigated. It is shown that the ratio between the initial side-branch spacing near dendrite tips, lambda-2, and the dendrite-tip radius, r(t), equals 2 to 2.5. The ratio between the distance from the dendrite tip to the location of the first side branch formation, lambda(p), and the t(r) equals 8 to 10. It was found that the model proposed by Kirkwood (1985) for the secondary dendrite arm coarsening shows a very good quantitative fit to the experimentally observed secondary arm coarsening kinetics during directional solidification.
    Keywords: METALLIC MATERIALS
    Type: Metallurgical Transactions A - Physical Metallurgy and Materials Science (ISSN 0360-2133); 20A; 1889-189
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  • 6
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    High temperature creep behavior of single crystal gamma prime and gamma alloys (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The creep behavior of single crystals of gamma-prime and gamma alloys were investigated and compared to the response of two-phase superalloys tested previously. High temperature deformation in the gamma alloys was characteristic of a climb-controlled mechanism, whereas the gamma-prime based materials exhibited glide-controlled creep behavior. The superalloys were much more creep resistant than their constituent phases, which indicates the importance of the gamma/gamma-prime interface as a barrier for dislocation motion during creep.
    Keywords: METALLIC MATERIALS
    Type: Symposium on High-Temperature Ordered Intermetallic Alloys III; Nov 29, 1988 - Dec 01, 1988; Boston, MA; United States
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  • 7
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    Photothermoplastic films for holographic recording (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The electrophotographic and sensitometric characteristics of poly-N-vinyl carbazole photothermoplastic films, sensitized by an amorphous-Se sublayer are examined. It is shown that the photosensitivity of the material can be improved and its spectral range can be expanded by sensitization of amorphous Se with additions of Te, As, and Sb; this can be accomplished without a significant reduction in diffraction efficiency and resolving power.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-88574 , NAS 1.15:88574
    Format: application/pdf
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  • 8
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    Balloon-borne cryogenic spectrometer for measurement of lower stratospheric trace constituents (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A liquid-nitrogen cooled, multidetector Fourier transform spectrometer has been constructed to measure minor stratospheric constituents via high resolution, earth-limb emission spectroscopy from a balloon-borne platform. Cryogenic cooling, combined with the use of extrinsic silicon photoconductor detectors cooled to liquid-helium temperature, allows the detection of weak emission features of gaseous species. The spectrometer has two basic scan modes: the first mode records the continuous spectrum from 650-2100/cm with 0.2/cm resolution; the second simultaneously records four preselected narrow intervals (about 175/cm bandpass each) with 0.02/cm resolution, unapodized. Filtering of the interferogram signal is done by real-time, digital signal processing. The most important feature of this flat mirror Michelson system, with respect to remote balloon-borne operation, is the dynamic alignment system which maintains the relative parallelism of the two flat reflectors of the interferometer. Species identified to date in data obtained during a Nov. 6, 1984, flight include: CO2, O3, H2O, CH4, HNO3, N2O, NO2, NO, CCl3F (Freon-11) and CF2Cl2 (Freon-12).
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 9
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    Droplet field visualization and characterization via digital image analysis (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: This paper describes techniques that have been developed at JPL for visualization and measurements of droplet fields in a moving airstream. The techniques have been applied to a variety of problems which include simulation of heavy rain conditions in a wind tunnel, engine ingestion of wheel spray, analysis of fuel nozzle sprays and aerodynamic breakup of non-Newtonian liquids. The approach pursued here is direct imaging using a pulsed laser illumination source, followed by digital processing of photographic images. A laser double pulse technique has been used for determination of droplet velocities. Laser induced fluorescence has been used to enhance droplet definition in photographic images. The image processing software developed is capable of distinguishing between out-of-focus and in-focus drops, retaining only the latter for size determination.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 10
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    A critical examination of the dendrite growth models Comparison of theory with experimental data (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Three dendrite growth models for directionally solidified succinonitrile-acetone, succinonitrile-salol, aluminum-copper, and lead-paladium alloys are evaluated. The characteristics of the Burden and Hunt (1974) model, the Laxmanan (1985) model, and the Trivedi (1980) model are described. The dendrite tip temperature, tip radius, liquid composition, and primary arm spacing for the alloys are analyzed in terms of growth speed, alloy composition, and temperature gradient. It is observed that the Burden and Hunt model accurately predicts the proper behavior of the parameters, but does not provide good quantitative predictions. A good fit between the experimental data and the Trivedi and Laxmanan models is detected. The advantages of the Trivedi marginal stability analysis and the Laxmanan minimum dendrite tip undercooling approaches are discussed.
    Keywords: METALLIC MATERIALS
    Type: Acta Metallurgica (ISSN 0001-6160); 35; 175-183
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