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  • 1
    Electronic Resource
    Electronic Resource
    Conformation of ethylene glycol: Isometric group,ab initio study of internal H bonding and ir-matrix spectra of the species CH2OHCH2OH, CD2OHCD2OH and CH2ODCH2OD (1974)
    Springer
    Theoretical chemistry accounts 34 (1974), S. 277-292 
    Details
    ISSN: 1432-2234
    Keywords: Ethylene glycol ; conformation of ∼ ; bonding ; Isometric group of glycol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The isometric group of a semirigid model of the ethylene glycol molecule with 3 internal degrees of freedom is derived. Results of extensiveab initio computation of the electronic potential function with a Gaussian lobe basis set are presented from which two differentr e conformations are predicted. Both feature one single internal H bond in which one of the lone electron pairs of the acceptor O atom is involved. Symmetry sets of isometricr e-conformations and of transition points of the potential function are discussed. Infrared matrix spectra of glycol and 2 deuterated modifications are presented and discussed on the basis of two internally bonded conformations predicted byab initio calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553753
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Conformation of ethylene glycol: Isometric group,ab initio study of internal H bonding and ir-matrix spectra of the species CH2OHCH2OH, CD2OHCD2OH and CH2ODCH2OD (1974)
    Springer
    Theoretical chemistry accounts 34 (1974), S. 277-292 
    Details
    ISSN: 1432-2234
    Keywords: Ethylene glycol ; conformation of ∼ ; bonding ; Isometric group of glycol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The isometric group of a semirigid model of the ethylene glycol molecule with 3 internal degrees of freedom is derived. Results of extensiveab initio computation of the electronic potential function with a Gaussian lobe basis set are presented from which two differentr e conformations are predicted. Both feature one single internal H bond in which one of the lone electron pairs of the acceptor O atom is involved. Symmetry sets of isometricr e-conformations and of transition points of the potential function are discussed. Infrared matrix spectra of glycol and 2 deuterated modifications are presented and discussed on the basis of two internally bonded conformations predicted byab initio calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02399015
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Flight-Measured Aerodynamic Loads on a 0.92 Aspect Ratio Lifting Surface (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Ventral fin loads, expressed as normal force coefficients, bending moment coefficients, and torque coefficients, were measured during flight tests of a YF-12A airplane. Because of the proximity of the ventral fin to the ailerons, the aerodynamic loads presented were the result of both sideslip loads and aileron crossflow loads. Aerodynamic data obtained from strain gage loads instrumentation and some flight pressure measurements are presented for several Mach numbers ranging from 0.70 to 2.00. Selected wind tunnel data and results of linear theoretical aerodynamic calculations are presented for comparison.
    Keywords: AERODYNAMICS
    Type: YF-12 Experiments Symp., Vol. 1; p 73-91
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Effect of winglets on a first-generation jet transport wing. 4: Stability characteristics for a full-span model at Mach 0.30 (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The static longitudinal and lateral directional characteristics of a 0.035 scale model of a first generation jet transport were obtained with and without upper winglets. The data were obtained for take off and landing configurations at a free stream Mach number of 0.30. The results generally indicated that upper winglets had favorable effects on the stability characteristics of the aircraft.
    Keywords: AERODYNAMICS
    Type: NASA-TP-1119 , L-11705
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Drag reductions obtained by modifying a box-shaped ground vehicle (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A box-shaped ground vehicle was used to simulate the aerodynamic drag of high volume transports, that is, delivery vans, trucks, or motor homes. The coast-down technique was used to define the drag of the original vehicle, having all square corners, and several modifications of the vehicle. Test velocities ranged up to 65 miles per hour, which provided maximum Reynolds numbers of 1 times 10 to the 7th power based on vehicle length. One combination of modifications produced a reduction in aerodynamic drag of 61 percent as compared with the original square-cornered vehicle.
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-56027
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Drag reduction obtained by rounding vertical corners on a box-shaped ground vehicle (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A box-shaped ground vehicle was used to simulate the aerodynamic drag of delivery vans, trucks, and motor homes. A coast-down method was used to define the drag of this vehicle in a configuration with all square corners and a modified configuration with the four vertical corners rounded. The tests ranged in velocity from 30 miles per hour to 65 miles per hour, and Reynolds numbers ranged from 4.4 x 1,000,000 to 1.0 x 10 to the 7th power based on vehicle length. The modified configuration showed a reduction in aerodynamic drag of about 40 percent as compared to the square cornered configuration.
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-56023
    Format: application/pdf
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  • 7
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    The use of oil for in-flight flow visualization (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Oil was used to visualize inflight aerodynamic characteristics such as boundary layer transition, shock wave location, regions of separated flow, and surface flow direction. The technique, which is similar to wind tunnel oil-flow testing, involves an oil mixture to test aircraft before takeoff. After takeoff, the airplane climbs immediately to the test altitude and photographs are taken. The developmental experience is summarized, several examples of inflight oil-flow photographs are presented and discussed, and an approach for potential users of the technique is presented.
    Keywords: AERODYNAMICS
    Type: NASA-TM-84915 , H-1195 , NAS 1.15:84915 , Ann. Symp. of the Soc. of Flight Test Engr.; Aug 15, 1983 - Aug 19, 1983; Newport Beach, Ca; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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