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  • Other Sources  (270)
  • PROPULSION SYSTEMS  (147)
  • CHEMISTRY
  • 1970-1974  (270)
  • 1965-1969
  • 1974  (270)
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  • Other Sources  (270)
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  • 1970-1974  (270)
  • 1965-1969
Year
  • 1
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    Reduction of diesel engine exhaust noise in the petroleum mining industry (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: An important noise source in a drilling plant is Diesel engine exhaust. In order to reduce this noise, a reactive silencer of the derivative resonator type was proposed, calculated from the acoustic and design point of view and applied. As a result of applying such a silencer on the exhaust conduit of a Diesel engine the noise level dropped down to 18 db.
    Keywords: PROPULSION SYSTEMS
    Type: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 156-162
    Format: text
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  • 2
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    Electric propulsion - Now (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The state of the art of electric propulsion technology is discussed with a review of the many difficult engineering problems which must be resolved before the incorporation of electric propulsion in space missions. Interferences with the spacecraft and its scientific instrumentation, conducted and radiated electromagnetic interferences during the switching and processing of large electrical loads, and mercury and other eroded materials deposition on the spacecraft are indicated among the engineering and design challenges to be overcome and resolved.
    Keywords: PROPULSION SYSTEMS
    Type: AIAA Student Journal; 12; Apr. 197
    Format: text
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  • 3
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    Quantum chemical study of the thermodynamics, kinetics of formation and bonding of H2CN - Relevance to prebiotic chemistry (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: CHEMISTRY
    Type: Journal of Molecular Evolution; 3; 3, 19; 1974
    Format: text
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  • 4
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    GC-MS in the analysis of organic compounds in meteorites (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The application of an analytical approach combining gas chromatography with mass spectrometry (GC-MS) has shown that the amino acid composition of meteorite extracts is quite complex. A computer was used in the evaluation of the data obtained in the investigations. The computer programs developed have been concerned solely with the mass spectra of amino acids. Specialized programs have been written to determine the number of carbon atoms in an amino acid which is a member of any of three subclasses.
    Keywords: CHEMISTRY
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  • 5
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    Quiet engine from NASA (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Engine designs resulting from the NASA sponsored quiet engine program are described in terms of their possible use on the DC-8. These engines have high bypass ratios for low jet noise and low-speed, low-noise fans. Experiments were carried out on various fan designs with different tip speeds. The advantage of low tip speeds and high lift coefficients has been demonstrated. The engines are equipped with flight-standard nacelles with acoustic suppression. It is estimated that these improvements will reduce DC-8 noise by about 26EPNdB-29EPNdB.
    Keywords: PROPULSION SYSTEMS
    Type: Flight International; 106; July 25
    Format: text
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  • 6
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    A flash photolysis-resonance fluorescence kinetics study of the reaction S/3P/ + OCS (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Using the technique of flash photolysis-resonance fluorescence, the reaction of ground-state atomic sulfur with carbonyl sulfide has been investigated over the temperature range from 233 to 445 K. Over this temperature range, the experimental data were fitted to an Arrhenius equation of the form k sub 1 = (1.52 plus or minus 0.20) x 10 to the minus 12th power exp(-3.63 plus or minus 0.12 kcal/mol/RT) cu cm/molecule/sec. A comparison of these results with previous investigations on this reaction system is presented.
    Keywords: CHEMISTRY
    Type: Journal of Physical Chemistry; 78; June 6
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  • 7
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    Enhanced oxidative vaporization of Cr2O3 and chromium by oxygen atoms (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Rates of oxidative vaporization of Cr2O3 have been found to be markedly enhanced in the presence of oxygen atoms. Investigations were conducted over the temperature range 200-1250 C. For Cr2O3 the enhancement was about 10 to the 9th power at 550 C in oxygen containing 2.5% atoms. Rapid oxidative vaporization of bare chromium was observed below 800 C, the rate being about one-half that of Cr2O3. Results are interpreted in terms of thermochemical analysis.
    Keywords: CHEMISTRY
    Type: Electrochemical Society; vol. 121
    Format: text
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  • 8
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    Sticking probabilities for the adsorption of hydrogen on clean Ni/111/, Ni/100/, Ni sheet and evaporated Ni films (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Determination of the sticking probability for hydrogen adsorption on clean Ni(111), Ni(100), polycrystalline nickel sheet, and polycrystalline evaporated nickel films, using a modification of the reflection detector technique of Horgan and King (1970) for metal films. The initial sticking probability for hydrogen adsorption on a nickel film at 300 K by the proposed method is found to be 0.25 in comparison to 0.35 for hydrogen adsorption on a nickel film using the reflection detector technique. Also, the sticking probabilities on smooth single-crystal (111) and (100) planes and polycrystalline sheets are found to be lower than those on the rougher polycrystalline nickel films.
    Keywords: CHEMISTRY
    Type: Surface Science; 41; 2, Fe; Feb. 197
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  • 9
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    Photo-induced free radicals on a simulated Martian surface (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Results of an electron spin resonance study of free radicals in the ultraviolet irradiation of a simulated Martian surface suggest that the ultraviolet photolysis of CO or CO2, or a mixture of both, adsorbed on silica gel at minus 170 C involves the formation of OH radicals and possibly of H atoms as the primary process, followed by the formation of CO2H radicals. It is concluded that the photochemical synthesis of organic compounds could occur on Mars if the siliceous surface dust contains enough silanol groups and/or adsorbed H2O in the form of bound water.
    Keywords: CHEMISTRY
    Type: Nature; 248; Apr. 12
    Format: text
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  • 10
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    Major and trace elements in the Allende meteorite (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The Allende samples analyzed include seven Ca, Al-rich aggregates, ten melilite chondrules, an olivine chondrule, and two olivine-rich aggregates. The Allende meteorite has been described as a type III carbonaceous chondrite. Major element abundances were determined with the electron microprobe technique reported by Reed and Ware (1972). An MS7 spark source mass spectrometer was used for the determination of trace element abundances.
    Keywords: CHEMISTRY
    Type: Nature; 249; May 24
    Format: text
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