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  • 1
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    Automated ultrasonic scanning by triangulation method (1967)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Acoustic spectrometer system for ultrasonic nondestructive testing by triangulation method
    Keywords: MACHINE ELEMENTS AND PROCESSES
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  • 2
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    Automated ultrasonic scanning by triangulation methods - The Dickinson system (1966)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Flaw detection by ultrasonic scanning using triangulation methods
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 3
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    Confining hot spots in 3C 196 - Implications for QSO-companion galaxies (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: VLBI observations of the extremely compact hot spot in the northern radio lobe of the QSO 3C 196 reveal the angular size of its smallest substructure to be 0.065 arcsec x 0.045 arcsec or about 300 pc at the redshift distance. The morphology of the hot spot and its orientation relative to the more diffuse radio emission suggest that it is formed by an oblique interaction between the nuclear QSO jet and circum-QSO cloud. The inferred density in this cloud, together with its apparent size, imply that the cloud contains a galactic mass, greater than a billion solar masses of gas. The effect of the jet will be to hasten gravitational collapse of the cloud. If many QSOs such as 3C 196 are formed or found in gas-rich environments, the QSO radio phase may commonly stimulate the metamorphosis of circum-QSO gas to QSO-companion galaxies or it may play a significant part in catalyzing star formation in existing companions.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 306; 107-109
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  • 4
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    Advanced radiographic imaging techniques. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Examination of the nature and operational constraints of conventional X-radiographic and neutron imaging methods, providing a foundation for a discussion of advanced radiographic imaging systems. Two types of solid-state image amplifiers designed to image X rays are described. Operational theory, panel construction, and performance characteristics are discussed. A closed-circuit television system for imaging neutrons is then described and the system design, operational theory, and performance characteristics are outlined. Emphasis is placed on a description of the advantages of these imaging systems over conventional methods.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 5
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    Calculation of activation energies for hydrogen-atom abstractions by radicals containing carbon triple bonds (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Activation energies are calculated by the bond-energy-bond-order (BEBO) and the bond-strength-bond-length (BSBL) methods for the reactions of C2H radicals with H2, CH4, and C2H6 and for the reactions of CN radicals with H2 and CH4. The BSBL technique accurately predicts the activation energies for these reactions while the BEBO method yields energies averaging 9 kcal higher than those observed. A possible reason for the disagreement is considered.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: Journal of Physical Chemistry; 85; Dec. 10
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  • 6
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    Operating systems (1984)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: A counter operating system creates a hierarchy of levels of abstraction, so that at a given level all details concerning lower levels can be ignored. This hierarchical structure separates functions according to their complexity, characteristic time scale, and level of abstraction. The lowest levels include the system's hardware; concepts associated explicitly with the coordination of multiple tasks appear at intermediate levels, which conduct 'primitive processes'. Software semaphore is the mechanism controlling primitive processes that must be synchronized. At higher levels lie, in rising order, the access to the secondary storage devices of a particular machine, a 'virtual memory' scheme for managing the main and secondary memories, communication between processes by way of a mechanism called a 'pipe', access to external input and output devices, and a hierarchy of directories cataloguing the hardware and software objects to which access must be controlled.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Scientific American (ISSN 0036-8733); 251; 94
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  • 7
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    Quality and reliability assurance research at MSFS (1968)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Quality and reliability assurance research reviews at Marshall Space Flight Center
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: RES. ACHIVEMENTS REV., VOL. 2 1968 (SEE N69-18059 07-34)
    Format: application/pdf
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  • 8
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    Energetic secondary electrons and the nonthermal galactic radio background - A probe of the magnetic field in interstellar clouds (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A previous analysis of the manifestations of charged-pion-decay secondary electrons in interstellar cloud material is extended to include those contributions to the Galactic radio and soft gamma-ray backgrounds that are directly attributable to energetic secondaries. The equilibrium distribution of secondary electrons in dense interstellar clouds is calculated, synchrotron emissivity from isolated interstellar clouds is examined, and it is shown how the value of the magnetic field in these clouds may be determined by observing the radio emission in their directions. The contribution that such clouds make to the integrated radio background is evaluated, and the Galactic distribution of bremsstrahlung gamma rays that arise from interactions of secondary electrons with thermal material in dense clouds is computed. The results indicate that a magnetic field of no more than 80 microgauss is characteristic of dense clouds and that the integrated synchrotron radiation from secondary electrons in interstellar clouds will contribute a significant fraction of the nonthermal brightness along the Galactic equator even if the mean cloud field is as low as 35 microgauss.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 221
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  • 9
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    Are supernovae radio sources - A search for radio emission from young supernova remnants (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A search has been conducted for radio emission at 11 and 3.7 cm from 46 recent supernovae having accurately determined positions and ages of a few months to 79 years. None of these supernovae was detected at a flux density greater than 5-10 mJy. These negative results cannot be explained by internal absorption and are thus due to intrinsically weak synchrotron emission in young supernova remnants. There are two possibilities: either (1) relativistic particles are accelerated not by the supernova outburst but by processes occurring much later (at least about 75 years) in the remnant or (2) the magnetic field in the young remnants evolves very slowly, in proportion to the inverse square root of time, so that its value in the remnants observed was no more than about 0.002 gauss. The constraints the observations place on these possibilities and on the energy in cosmic rays in young remnants are discussed. Gamma-ray observations at times of no more than about 1 year following an outburst will allow one to discriminate between the two alternative explanations of the radio results.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 220
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  • 10
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    Origin and evolution of the radio emission from immediate postoutburst supernovae (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Several models for the radio emission from immediate postoutburst supernovae are examined under the assumption that the expanding remnant consists of a homogeneously mixed distribution of relativistic particles, magnetic field, and thermal plasma. The evolutionary models are: (1) an adiabatic expansion model; (2) a model incorporating the existence of a central pulsar; and (3) variations on the first two models in which relativistic electrons are accelerated either instantaneously or over an extended period of time and in which ionization, bremsstrahlung, synchrotron, Compton, and expansion losses are explicitly included. The character of the radio emission expected from these models is quite dissimilar. Whereas in adiabatic expansion models the emission is expected to increase slowly and become most intense at high frequencies, in models involving a central pulsar the emission should increase rapidly with a maximum flux density that is the same at all frequencies. The theoretical evolution of the radio emission for each model is compared with observations of SN 1970g.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 220
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