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  • 1
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    Structural alignment sensor (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: Comparative Michelson interferometers are discussed as well as the operating range potential of a structural alignment sensor (SAS) which requires only one laser mode. Schematics are presented for the distance measurement logic, the basic SAS system, the SAS optical layout, the coarse measurement signal processor, and the measured range resolution.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: NASA. Langley Res. Center Large Space Systems Technol., Vol. 1; p 491-505
    Format: text
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  • 2
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    Apollo gastrointestinal analysis (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Fecal bile acid patterns for the Apollo 17 flight were studied to determine the cause of diarrhea on the mission. The fecal sterol analysis gave no indication of an infectious diarrhea, or specific, or nonspecific etiology occurring during the entire flight. It is assumed that the gastrointestinal problems encountered are the consequences of altered physiology, perhaps secondary to physical or emotional stress of flight.
    Keywords: AEROSPACE MEDICINE
    Type: NASA-CR-144437
    Format: application/pdf
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  • 3
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    Applications of hybrid and digital computation methods in aerospace-related sciences and engineering (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The computing equipment in the engineering systems simulation laboratory of the Houston University Cullen College of Engineering is described and its advantages are summarized. The application of computer techniques in aerospace-related research psychology and in chemical, civil, electrical, industrial, and mechanical engineering is described in abstracts of 84 individual projects and in reprints of published reports. Research supports programs in acoustics, energy technology, systems engineering, and environment management as well as aerospace engineering.
    Keywords: NUMERICAL ANALYSIS
    Type: NASA-CR-157364
    Format: application/pdf
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  • 4
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    Cargo transportation by airships: A systems study (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A systems engineering study of a lighter than air airship transportation system was conducted. The feasibility of the use of airships in hauling cargo was demonstrated. Social, legal, environmental and political factors were considered as well as the technical factors necessary to design an effective airship transportation system. In order to accomplish an effective airship transportation program two phases of implementation were recommended. Phase I would involve a fleet of rigid airships of 3.5 million cubic feet displacement capable of carrying 25 tons of cargo internal to the helium-filled gas bag. The Phase I fleet would demonstrate the economic and technical feasibility of modern-day airships while providing a training capability for the construction and operation of larger airships. The Phase II portion would be a fleet of rigid airships of 12 million cubic feet displacement capable of carrying a cargo of 100 tons a distance of 2,000 miles at a cruising speed of 60 mph. An economic analysis is given for a variety of missions for both Phase I and Phase II airships.
    Keywords: AERONAUTICS (GENERAL)
    Type: NASA-CR-2636 , S-452 , JSC-10655
    Format: application/pdf
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  • 5
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    Two-electron bond-orbital model, 1 (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Harrison's one-electron bond-orbital model of tetrahedrally coordinated solids was generalized to a two-electron model, using an extension of the method of Falicov and Harris for treating the hydrogen molecule. The six eigenvalues and eigenstates of the two-electron anion-cation Hamiltonian entering this theory can be found exactly general. The two-electron formalism is shown to provide a useful basis for calculating both non-magnetic and magnetic properties of semiconductors in perturbation theory. As an example of the former, expressions for the electric susceptibility and the dielectric constant were calculated. As an example of the latter, new expressions for the nuclear exchanges and pseudo-dipolar coefficients were calculated. A simple theoretical relationship between the dielectric constant and the exchange coefficient was also found in the limit of no correlation. These expressions were quantitatively evaluated in the limit of no correlation for twenty semiconductors.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: NASA-TM-X-72889
    Format: application/pdf
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  • 6
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    Two-electron bond-orbital model, 2 (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The two-electron bond-orbital model of tetrahedrally-coordinated solids is generalized and its application extended. All intrabond matrix elements entering the formalism are explicitly retained, including the direct overlap S between the anion and cation sp3 hybrid wavefunctions. Complete analytic results are obtained for the six two-electron eigenvalues and eigenstates of the anion-cation bond in terms of S, one-electron parameters V2 and V3, and two-electron correlation parameters V4, V5 and V6. Refined formulas for the dielectric constant and the nuclear exchange and pseudodipolar coefficients, as well as new expressions for the valence electron density, polarity of the bond and the cohesive energy, are then derived. The theory gives a good account of the experimentally observed trends in all properties considered and approximate quantitative agreement is achieved for the pseudodipolar coefficient.
    Keywords: NUCLEAR AND HIGH-ENERGY PHYSICS
    Type: NASA-CR-148830
    Format: application/pdf
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  • 7
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    Airport laser-Doppler (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Laser system remotely senses and tracks aircraft-wake turbulence. Other potential applications include long-range (remote) detection of airflow, monitoring smokestack exit flow velocities, and observing winds at altitude.
    Keywords: PHYSICAL SCIENCES
    Type: MFS-23423 , NASA Tech Briefs (ISSN 0145-319X); 1; 2; P. 183
    Format: text
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  • 8
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    Three-body association reactions of H/+/ and H3/+/ ions in hydrogen from 135 to 300 K (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics; 65; Aug. 15
    Format: text
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  • 9
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    Two-electron bond-orbital model. I (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The one-electron bond-orbital model of Harrison (1973) for tetrahedrally coordinated solids is modified to a two-electron model using a generalization of Falicov and Harris' (1969) method for treating the hydrogen molecule. Expressions for nuclear-exchange and pseudodipolar interactions are obtained in terms of bond-orbital model parameters. The eigenfunctions and eigenvalues of the Hamiltonian are employed along with standard perturbation theory to calculate the energy shifts resulting from the application of an external electric field and induced by the magnetic interaction between the nuclear spins and the bond-electron spins. The quantitative predictions of the derived formulas are examined for real semiconductors involving elements and compounds from periodic groups III, IV, and V. It is concluded that the present two-electron model makes it possible to assess the quantitative effects of electron correlation in the anion-cation bond for both nonmagnetic properties (electric susceptibility, dielectric constant) and magnetic properties (nuclear-exchange and pseudodipolar interactions) of various materials.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Physical Review B - Solid State; vol. 12
    Format: text
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  • 10
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    Energy recovery from solid waste. Volume 2: Technical report (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A systems analysis of energy recovery from solid waste demonstrates the feasibility of several current processes for converting solid waste to an energy form. The social, legal, environmental, and political factors are considered in depth with recommendations made in regard to new legislation and policy. Biodegradation and thermal decomposition are the two areas of disposal that are considered with emphasis on thermal decomposition. A technical and economic evaluation of a number of available and developing energy-recovery processes is given. Based on present technical capabilities, use of prepared solid waste as a fuel supplemental to coal seems to be the most economic process by which to recover energy from solid waste. Markets are considered in detail with suggestions given for improving market conditions and for developing market stability. A decision procedure is given to aid a community in deciding on its options in dealing with solid waste, and a new pyrolysis process is suggested. An application of the methods of this study are applied to Houston, Texas.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-2526 , S-443-VOL-2
    Format: application/pdf
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