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  • Weitere Quellen  (1.393)
  • CHEMISTRY  (1.193)
  • Industrial Chemistry
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  • 1970-1974  (1.302)
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  • 1
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    Near-field observations and source parameters of Central California earthquakes (1974)
    In:  Bull. Seism. Soc. Am., San Francisco, Schweizerbart'sche Verlagsbuchhandlung, vol. 65, no. B10, pp. 1855-1886, pp. B10404, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publikationsdatum: 1974
    Schlagwort(e): Nearfield ; Source parameters ; Seismology ; Nuclear explosion ; BSSA
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    BIBLIOGRAFIE SEISMOLOGIE
  • 2
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    Reflections, rays and reverberations (1974)
    In:  Bull. seism. Soc. Am., New York, Allerton Press, vol. 64, no. 1, pp. 1685-1696, pp. L01606, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1974
    Schlagwort(e): Reflectivity ; Ray seismics ; Multiples ; Seismology ; Seismics (controlled source seismology) ; BSSA
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    BIBLIOGRAFIE SEISMOLOGIE
  • 3
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    Seismic observations in Germany of a 10 t explosion off Scotland (1974)
    In:  J. Geophys., Luxembourg, Conseil de l'Europe, vol. 40, no. 6, pp. 259-264, pp. L15S17, (ISBN: 0-12-018847-3)
    Details
    Publikationsdatum: 1974
    Schlagwort(e): Seismology ; Deep seismic sounding (espec. cont. crust) ; Project report/description
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    BIBLIOGRAFIE SEISMOLOGIE
  • 4
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    Body waves as normal and leaking modes (1974)
    In:  Bull. seism. Soc. Am., Jena, Scientific American, vol. 64, no. B9, pp. 301-307, pp. B09309, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1974
    Schlagwort(e): Body waves ; Seismology ; NOModelling ; Synthetic seismograms ; Leaking modes ; Layers ; BSSA ; Bremaecker
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    BIBLIOGRAFIE SEISMOLOGIE
  • 5
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    Systematische Untersuchungen der kurzperiodischen seismischen Bodenunruhe in der Bundesrepublik Deutschland (1974)
    In:  Geologisches Jahrbuch Reihe E Geophysik - geophysics, Würzburg, Pergamon, vol. 37, no. E3, pp. 1-59, pp. B05S01, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1974
    Schlagwort(e): Seismology ; NOISE ; background ; Germany
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    BIBLIOGRAFIE SEISMOLOGIE
  • 6
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    Spectral Analysis in Geophysics (1974)
    Elsevier
    In:  Amsterdam, Elsevier, vol. 8, pp. 415, (ISBN 0-471-95596-5)
    Details
    Publikationsdatum: 1974
    Schlagwort(e): Textbook of geophysics ; Data analysis / ~ processing ; Spectral analysis ; Spectrum ; Seismology ; Seismics (controlled source seismology) ; Bath
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    BIBLIOGRAFIE SEISMOLOGIE
  • 7
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    Seismic source function for an underground nuclear explosion (1974)
    In:  Bull. Seism. Soc. Am., Tokyo, Inst. f. Theoret. Geodäsie, vol. 64, no. 3, pp. 131-148
    Details
    Publikationsdatum: 1974
    Schlagwort(e): Nuclear explosion ; Source ; Seismology ; BSSA
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    BIBLIOGRAFIE SEISMOLOGIE
  • 8
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    Recorded strong motion on the Hsinfengkiang-dam, China (1974)
    In:  Bull. Seism. Soc. Am., Warszawa, Elsevier, vol. 64, no. 1, pp. 1337-1342, pp. 2091, (ISBN: 0-12-018847-3)
    Details
    Publikationsdatum: 1974
    Schlagwort(e): Induced seismicity ; Earthquake precursor: chemical (Rn, water(-level,...) ; Earthquake precursor: stresses ; Seismology ; Waves ; BSSA
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    BIBLIOGRAFIE SEISMOLOGIE
  • 9
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    An automatic event detector at the Tonto Forest seismic observatory (1974)
    In:  Geophys., Warszawa, Elsevier, vol. 39, no. 2, pp. 63-643, pp. 2382, (ISBN: 0-12-018847-3)
    Details
    Publikationsdatum: 1974
    Schlagwort(e): Seismology ; Detectors ; sta
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  • 10
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    Automatic analysis of tape-recordings from seismic networks (1974)
    In:  Geophys. J. R. astr. Soc., Roma, Acad. Roy. des Sciences, vol. 39, no. 1, pp. 155-168, pp. B04102, (ISBN: 0-12-018847-3)
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    Publikationsdatum: 1974
    Schlagwort(e): Seismology ; Seismic networks ; GJRaS
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    BIBLIOGRAFIE SEISMOLOGIE
  • 11
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    Relations between different kinds of magnitude determination and their regional variations (1974)
    Central Earth Physics Institute, Academy of Sciences of the G.D.R.
    In:  Proc. XIV General Assembly of the European Seismological Commission, Trieste, September 16-22, 1974, Rome, Central Earth Physics Institute, Academy of Sciences of the G.D.R., vol. 10, no. 464, pp. 27-39
    Details
    Publikationsdatum: 1974
    Schlagwort(e): Magnitude ; Data analysis / ~ processing ; Seismology ; noksp
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    BIBLIOGRAFIE SEISMOLOGIE
  • 12
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    Getriggerte Bruchvorgänge als Modell für die Entstehung von Tieferdbeben (1974)
    Institut f. Meteorol. und Geophys., Univ. Frankfurt am Main
    In:  Dissertation, San Antonio, Institut f. Meteorol. und Geophys., Univ. Frankfurt am Main, vol. 11, no. CUED/C/Mats/Tr 51, pp. 426-439
    Details
    Publikationsdatum: 1974
    Schlagwort(e): Source mechanics ; SModelling ; Source ; Laboratory measurements ; Seismology
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    BIBLIOGRAFIE SEISMOLOGIE
  • 13
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    A precise, continuous measurement of seismic velocity (1974)
    In:  J. Geophys. Res., Tübingen, Europ. Ass. Exploration Geophys., vol. 79, no. 2, pp. 399-406, pp. 2017, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1974
    Schlagwort(e): Velocity ; Seismology ; Earthquake precursor: prediction research ; Earthquake precursor: Vp/Vs anomalies ; JGR ; Body waves
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    BIBLIOGRAFIE SEISMOLOGIE
  • 14
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    Automatic phase identification with one and two large aperture seismic arrays (1974)
    In:  Bull. Seism. Soc. Am., Washington, D.C., AGU, vol. 64, no. 5, pp. 221-233, pp. 1489, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1974
    Schlagwort(e): Seismology ; Detectors ; AUD ; Seismic arrays ; Toksoez ; Toksoz ; BSSA
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    BIBLIOGRAFIE SEISMOLOGIE
  • 15
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    Global Tectonics and Earthquake Risk (1974)
    Elsevier
    In:  Amsterdam, London, New York, xiv+320 pp., Elsevier, vol. 5, no. 22, pp. 662-664, (ISBN 1-4020-1244-6)
    Details
    Publikationsdatum: 1974
    Schlagwort(e): Earthquake risk ; Earthquake hazard ; Earthquake engineering, engineering seismology ; Seismicity ; Plate tectonics ; Tectonics ; Seismology
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    BIBLIOGRAFIE SEISMOLOGIE
  • 16
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    Magnitude recurrence relation for central Mississippi Valley earthquakes (1974)
    In:  Bull. Seism. Soc. Am., Dordrecht, Martinus Nijhoff Publishers, vol. 64, no. 3, pp. 1189-1207, pp. L11307, (ISSN: 1340-4202)
    Details
    Publikationsdatum: 1974
    Schlagwort(e): Seismicity ; Recurrence of earthquakes ; Seismology ; BSSA
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  • 17
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    Brunnen als seismische Übertragungssysteme (1974)
    Fachbereich Geowissenschaften der Johann Wolfgang von Goethe-Universität Frankfurt am Main
    In:  Dissertation, Yaroslavl, U.S.S.R., Fachbereich Geowissenschaften der Johann Wolfgang von Goethe-Universität Frankfurt am Main, vol. C 560, 183 pp., no. PL-TR-91-2130, pp. 5-7, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1974
    Schlagwort(e): Seismology ; Fluids ; Instruments
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  • 18
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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
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    Publikationsdatum: 2011-08-16
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Molecular Evolution; 3; 3, 19; 1974
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  • 19
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    GC-MS in the analysis of organic compounds in meteorites (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: 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.
    Schlagwort(e): CHEMISTRY
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  • 20
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    A flash photolysis-resonance fluorescence kinetics study of the reaction S/3P/ + OCS (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: 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.
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Physical Chemistry; 78; June 6
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  • 21
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    Enhanced oxidative vaporization of Cr2O3 and chromium by oxygen atoms (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: 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.
    Schlagwort(e): CHEMISTRY
    Materialart: Electrochemical Society; vol. 121
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  • 22
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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
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    Publikationsdatum: 2011-08-16
    Beschreibung: 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.
    Schlagwort(e): CHEMISTRY
    Materialart: Surface Science; 41; 2, Fe; Feb. 197
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  • 23
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    Photo-induced free radicals on a simulated Martian surface (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: 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.
    Schlagwort(e): CHEMISTRY
    Materialart: Nature; 248; Apr. 12
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  • 24
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    Major and trace elements in the Allende meteorite (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: 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.
    Schlagwort(e): CHEMISTRY
    Materialart: Nature; 249; May 24
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  • 25
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    Evidence for two immunologically distinct acetyl-coenzyme A synthetases in yeast (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Evidence is presented that clearly establishes the presence of two acetyl-CoA synthetases in Saccharomyces cerevisiae, one elaborated under 'aerobic' conditions, the other under 'nonaerobic' conditions. The antibody produced by each enzyme is immunologically specific.
    Schlagwort(e): CHEMISTRY
    Materialart: Biochimica et Biophysica Acta; 341; 1974
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  • 26
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    Thermochemical water decomposition processes (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Thermochemical processes which lead to the production of hydrogen and oxygen from water without the consumption of any other material have a number of advantages when compared to other processes such as water electrolysis. It is possible to operate a sequence of chemical steps with net work requirements equal to zero at temperatures well below the temperature required for water dissociation in a single step. Various types of procedures are discussed, giving attention to halide processes, reverse Deacon processes, iron oxide and carbon oxide processes, and metal and alkali metal processes. Economical questions are also considered.
    Schlagwort(e): CHEMISTRY
    Materialart: I & EC - Industrial and Engineering Chemistry; vol. 13
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  • 27
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    The determination of soil moisture by extraction and gas chromatography (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Soil moisture content was determined by extracting soil with methanol and subsequently analyzing the extract for water by gas chromatography. With air-dried mineral soils, this method gave slightly higher moisture content values than those obtained by the oven-dry method. Moisture content was determined quantitatively in soils to which various amounts of water had been added. The complete procedure, including extraction and analysis, requires less than one hour and gives results that closely compare to the oven-dry method.
    Schlagwort(e): CHEMISTRY
    Materialart: Soil Science; 117; 2, 19; 1974
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  • 28
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    The chemical composition of cosmic ray nuclei above 1.3 GeV per nucleus and 23 GeV per nucleus (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Measurements made with a balloon-borne counter telescope are reported. The telescope was flown from Palestine, Tex., during the fall of 1971 for a total of 10 hours under an average residual atmospheric depth of 4.4 g per sq cm. The data analysis indicates that the integral flux ratios above 1.3 GeV per nucleus and 23 GeV per nucleus are consistent with energy independence.
    Schlagwort(e): CHEMISTRY
    Materialart: Astrophysics and Space Science; 28; May 1974
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  • 29
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    The chemisorption of H2O, HCOOH and CH3COOH on thin amorphous films of Al2O3 (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Investigation of the irreversible chemisorption of water, formic acid and acetic acid on a thin amorphous aluminum oxide film, using inelastic tunneling spectroscopy. All of the tunnel junctions employed were Al-Al2O3-Pb junctions with the adsorbate on the Al2O3 surface between the Al2O3 and the Pb electrode. The results obtained include the finding that all Al2O3 surfaces prepared by oxidation of Al have free CH groups present on them.
    Schlagwort(e): CHEMISTRY
    Materialart: Surface Science; 41; 1, Ja; Jan. 197
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  • 30
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    Oxygen and hydrogen atom concentration profiles in the premixed propane/oxygen flame (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The oxygen and hydrogen free radical (atom) concentration profiles in the premixed propane/oxygen flame at 92.5% oxygen were determined using electron spin resonance (ESR) spectroscopy techniques. The ESR instrument was specially modified so that the flame can be probed for determining the oxygen and hydrogen atom population densities during the actual combustion process of propane burning in oxygen. The technique used for propane is similar to that suggested by Fristrom and Westenberg to measure the free radical concentration profiles in C-C hydrocarbon/oxygen combustion.
    Schlagwort(e): CHEMISTRY
    Materialart: Thermochimica Acta; 8; Apr. 197
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  • 31
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    The physical interaction of nitrogen with Pyrex, stainless steel, and nickel at very low pressure (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Vacuum Science and Technology; 11; Jan
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  • 32
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    Production of organic molecules by proton irradiation (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Preliminary experiments were carried out to investigate the effectiveness of proton irradiation for producing organic chromophores. The source of the 2 MeV protons used in the experiments was a model Van de Graaff accelerator. The gas cells used were hollow aluminum cylinders. The test results show that energetic protons can be an effective energy source for the formation of complex molecules from simple ones. With the exception of sulfide compounds none of the molecules that were identified are colored. However, coloring agents could be contained in unresolvable fractions.
    Schlagwort(e): CHEMISTRY
    Materialart: Nature; 247; Jan. 11
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  • 33
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    Internal pressures and molecular dimensions in aqueous solutions of some chlorides (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: On the basis of measurements of the velocity of ultrasounds in aqueous solutions of some alkaline-earth chlorides (MgCl2, CaCl2, BaCl2) the concentration and temperature dependences of the internal pressure were determined. Using these results, as well as surface tension measurements, the mean diameters of the molecular species as a function of concentration and temperature, were determined.
    Schlagwort(e): CHEMISTRY
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 2, B (NASA-TT-F-15663); p 172-176
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  • 34
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    Checking the statistical theory of liquids by ultraacoustic measurements (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The manner of theoretically obtaining radial distribution functions 9(r) for n-hexane as a function of temperature is described. With the aid of function g(r) the coefficient of dynamic viscosity and the coefficient of volumetric viscosity for temperatures ranging from 213 K to 273 K were calculated. With the aid of the two coefficients of viscosity the coefficient of absorption of ultrasounds in n-hexane referred to the square of the frequency was determined. The same values were measured experimentally. Comparison of theory with experiments resulted in satisfactory agreement.
    Schlagwort(e): CHEMISTRY
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 2, B (NASA-TT-F-15663); p 166-171
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  • 35
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    Molecular compressibility of some halides in alcohols (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: After measuring ultrasonic velocity and density, the molecular compressibility values from Wada's formula were calculated, for alkali metal halide solutions in methyl, ethyl, butyl, and glycol alcohol. The temperature and concentration dependence were studied, finding deviations due to the hydrogen bonds of the solvent.
    Schlagwort(e): CHEMISTRY
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 2, B (NASA-TT-F-15663); p 158-161
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  • 36
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    Detection of dilute organic acids in water by inelastic tunneling spectroscopy (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Study of inelastic electron tunneling spectroscopy (IETS) spectra obtained from junctions exposed to dilute solutions of organic molecules in both liquid and vapor phases. The results indicate that it is possible in principle to detect the presence and to measure the concentration of at least some organic molecules in dilute aqueous solution by means of the IETS technique. Some fine points pertaining to the application of this technique are discussed, and it is pointed out that through appropriate refinements IETS may become a valuable tool for analytical water chemistry.
    Schlagwort(e): CHEMISTRY
    Materialart: Surface Science; 43; 2, Ju; June 197
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  • 37
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    Studies of aircraft wake chemistry and dispersion (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Use of aerospace technology to study aircraft wakes is reviewed. It is shown how aerospace vehicles can be used to provide data for increased understanding of the atmosphere and of aircraft exhaust trails where knowledge is inadequate to evaluate fully the potential impact of the engine emissions. Models of aircraft near-field exhaust wakes are characterized by jet, vortex, and dispersion regimes. Wake growth in the jet regime is self-determined and rapid, whereas further spreading is inhibited in the vortex regime because of circulating vortex motion. Wake diffusion in the dispersion regime is initially influenced by aircraft induced turbulence but is dominated later by small-scale atmospheric turbulence. Computed fluid mechanical results show the importance of effects such as wake buoyancy, wind shear, turbulence, and traffic corridor exhaust buildup on dispersion of the wake. In the jet regime the exhaust characteristics and thermochemistry serve to illustrate initial chemical changes involving potential pollutant species.
    Schlagwort(e): CHEMISTRY
    Materialart: Acta Astronautica; 1; Jan
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  • 38
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    Ultrasonic filtration of industrial chemical solutions (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The practical results obtained as a result of filtering industrial chemical solutions under continuous flow conditions with the aid of an ultrasonic filter are presented. The main part of the assembly consists of an ultrasonic generator with an output power of about 400 W and the filtration assembly, in which there is a magnetostrictive amplifier constructed for 20.5 kHz. In addition to ensuring a continuous flow of filtered solution, ultrasonic filters can be replaced or cleaned at intervals of time that are 8-10 times greater than in the case of mechanical filters. They yield considerably better results as far as the size of the filtered particles is concerned. The parameters on which filtration quality depends are also presented.
    Schlagwort(e): CHEMISTRY
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 2, B (NASA-TT-F-156631); p 153-157
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  • 39
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    Effects of ultrasonic fields in the phosphoric acid process (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: A process of apatite decomposition with sulfuric acid was studied under the influence of ultrasound in the phosphoric acid production process. The studies were carried out with and without ultrasonic fields in the reaction mixture, which resembled the mixing ratio used in technical production processes. Ultrasound with a frequency of 20 kHz and an intensity of 1 W/sq cm was used in the studies. A very favorable ultrasonic effect upon the degree of apatite decomposition was observed. The ultrasonic field affects the shape of byproduct gypsum crystals. In the H3PO4 production process without ultrasound, the byproduct gypsum crystallizes as long, thin needles which cause problems in filtration. In the trials involving the application of wound, gypsum crystallized in the form of small platelets possessing a favorable ratio of length to width.
    Schlagwort(e): CHEMISTRY
    Materialart: The 4th Natl. Conf. on acoustics, Vol. 2, B (NASA-TT-F-15663); p 148-152
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  • 40
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    Acoustic properties of organic acid mixtures in water (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The variation of the rate of propagation of ultrasounds in organic acid mixtures in water points to structural changes caused by interactions that take place under conditions of thermal agitation, at different acid concentrations. At the same time, a difference is found in the changes in velocity as a function of the length of the carbon chain of the acids in the mixture as a result of their effect on the groups of water molecules associated by hydrogen bonds.
    Schlagwort(e): CHEMISTRY
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 2, B (NASA-TT-F-15663); p 183-188
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  • 41
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    Gas chromatographic separation of water from cryogenically collected air samples - Enhanced concentration of trace organic volatiles prior to GC-MS analyses (1974)
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    Publikationsdatum: 2011-08-16
    Schlagwort(e): CHEMISTRY
    Materialart: Analytical Chemistry; 46; Apr. 197
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  • 42
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    Natural evidence for chemical and early biological evolution (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Oparin (1924) and Haldane (1929) have independently hypothesized that life arose under reducing conditions through an evolutionary sequence of events involving increasingly complex organic substances. The natural evidence for this hypothesis of chemical evolution is considered, giving particular attention to tangible samples which have been chemically analyzed in earth-bound laboratories. It is found that meteorites provide naturally occurring evidence in support of chemical evolution, but not of biological evolution. Studies on the early Precambrian Swaziland Sequence and the Bulawayan System of southern Africa provide evidence for very early biological evolution.
    Schlagwort(e): CHEMISTRY
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  • 43
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    Oxidative vaporization kinetics of Cr2O3 in oxygen from 1000 to 1300 C (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Rates of oxidative vaporization of Cr2O3 on preoxidized resistively heated chromium were determined in flowing oxygen at a pressure of 0.115 Torr for temperatures from 1000 to 1300 C. Reaction controlled rates were obtained from experimental rates by a gold calibration technique, and these rates were shown to agree with those predicted by thermochemical analysis. The activation energy obtained for the oxidative vaporization reaction corresponded numerically with the thermochemical enthalpy of the reaction. A theoretical equation is given for calculating the rate from thermodynamic data using boundary-layer theory.
    Schlagwort(e): CHEMISTRY
    Materialart: Electrochemical Society; vol. 121
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  • 44
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    Ultrasonic velocity and adiabatic compressibility in dioxane-water mixtures (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Using a method of diffraction of light on an ultrasonic beam, the velocity of ultrasounds and the adiabatic compressibility in dioxane-water mixtures were determined. The dependence of these quantities on the temperature (in the 15-50 C range) and on the concentration (0-100%) were studied. For each temperature there was found a velocity maximum and a compressibility minimum for a given value of the dioxane concentration. The different behavior of these mixtures is due to intense interactions between the molecules of the two liquids composing the mixture.
    Schlagwort(e): CHEMISTRY
    Materialart: the 4th Natl. Conf. on Acoustics, Vol. 2, B (NASA-TT-F-15663); p 189-193
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  • 45
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    The lower ionosphere of Venus (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Galactic cosmic ray bombardment provides a permanent background ionosphere in planetary atmospheres. A transport technique is used to compute the cosmic ray ionization rate profile in a model of the Venusian atmosphere at altitudes between 55 and 100 km. These ionization rates are then applied to a model of ion chemistry to predict equilibrium electron and ion density profiles. Ionization rates for typical solar flare proton events are available from earlier calculations and have been included.
    Schlagwort(e): CHEMISTRY
    Materialart: Planetary and Space Science; 22; Apr. 197
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  • 46
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    Approximate spin projection of three-component UHF wavefunctions - The states of the pentachlorocyclopentadienyl cation and the croconate dianion, C5O5/2-/ (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The approximate spin projection method of Amos et al. is extended to handle UHF wave functions having three significant components of differing multiplicity. An expression is given for the energy after single annihilation which differs from that of Amos and Hall. The new expression reproduces the results obtained from a previous exact calculation for which the weights and energies of the components are known. The extended approximate projection method is applied to the pi-electron UHF wave functions for the ground states of the pentachlorocyclopentadienyl cation and the croconate dianion, C5O5(2-). The results indicate a triplet ground state for the former and a singlet ground state for the latter, in agreement with experimental ESR susceptibility measurements for these molecular ions. C5C15(-) cannont be treated by restricted Hartree-Fock theory, due to its open-shell ground state. Incorrect results are obtained for the croconate dianion, if restricted Hartree-Fock theory and singly excited configuration interactions are utilized.
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Chemical Physics; 60; Feb. 15
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  • 47
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    Thin-layer assay of chlorophyll and analogous dry-column separation with effluent fluorometry (1974)
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    Publikationsdatum: 2011-08-16
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Chromatography; 88; 1974
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  • 48
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    Restudy of pyroxene-pyroxene equilibration temperature for ordinary chondrite meteorites (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Experimental verification of the conclusions of Van Schmus and Koffman (1967) that the equilibration temperatures of ordinary chondrites are roughly the same regardless of classification, and that these temperatures range from 770 to 860 C. The higher average relative equilibrium temperatures found are attributed to improvements in microprobe techniques, and better standards and correction procedures introduced over the last six years. Agreement is expressed with their conclusion that ordinary chondrites embody equilibria achieved within the metamorphic temperature regime and not under igneous temperatures as postulated earlier by Craig (1964) and Mueller (1964).
    Schlagwort(e): CHEMISTRY
    Materialart: Contributions to Mineralogy and Petrology; 43; 1974
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  • 49
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    Identification and dissociation energy of gaseous hafnium mononitride (1974)
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    Publikationsdatum: 2011-08-16
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Physical Chemistry; 78; Jan. 31
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  • 50
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    Quantitation and detection of vanadium in biologic and pollution materials (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: A review is presented of special considerations and methodology for determining vanadium in biological and air pollution materials. In addition to descriptions of specific analysis procedures, general sections are included on quantitation of analysis procedures, sample preparation, blanks, and methods of detection of vanadium. Most of the information presented is applicable to the determination of other trace elements in addition to vanadium.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-TM-X-71497 , E-7853
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  • 51
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    Developable images produced by X-rays using the nickel-hypophosphite system. 3: The latent image and trapped hydrogen (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: The hydrogen trapped in X-irradiated hypophosphites, phosphites, formates, oxalates, a phosphate, and some organic compounds was vacuum extracted and measured quantitatively with a mass spectrometer. After extraction, normally developable salts were found to be still developable. Thus, the latent image is not the trapped hydrogen but a species of the type HPO(-)2. The amplification factor for irradiated hypophosphites is about 100. A narrow range of wavelengths (at about 0.07 nm, 0.7 A) is responsible for the formation of the latent image.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-TN-D-7412 , E-7502
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  • 52
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    Trapping of hydrogen atoms in X-irradiated salts at room temperature and the decay kinetics (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: The salts (hypophosphites, formates, a phosphite, a phosphate, and an oxalate) were X-irradiated, whereby hydrogen formed chemically by a radiolytic process becomes trapped in the solid. By room temperature vacuum extraction, the kinetics for the evolution of this trapped hydrogen was studied mass spectrometrically. All salts except two exhibited second-order kinetics. The two exceptions (NaH2PO2(H2O) and K2HPO4) showed first-order kinetics. Based on experimental results, the escape of hydrogen involves three steps: the diffusion of hydrogen atoms from the bulk to the surface, association of these atoms on the surface (rate controlling step for second-order hydrogen evolution), and the desorption of molecular hydrogen from the surface. The hydrogen does not escape if the irradiated salt is stored in air, apparently because adsorbed air molecules occupy surface sites required in the escape mechanism.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-TN-D-7413 , E-7540
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  • 53
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    Photoionization and ion cyclotron resonance studies of the reaction of vibrationally excited C2H2/+/ ions with H2 (1974)
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    Publikationsdatum: 2019-06-27
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Chemical Physics; 61; Sept. 1
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  • 54
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    ICR study of nonreactive ion-molecule collision rate constants for Cl/-/ and Cr/CO/5/-/ (1974)
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    Publikationsdatum: 2019-06-27
    Beschreibung: Determination of experimental momentum transfer rate constants for systems of Cl(-) and Cr(CO)5(-) ions by means of an ion cyclotron resonance (ICR) line-broadening technique. It is found that in the pure polarization limit of small ion/large neutral collisions the Langevin ion mobility theory gives good agreement with experimental results. A comparison of isotropic and anisotropic neutral systems suggests that a correction for the anisotropic systems is necessary. Beyond the pure polarization limit the Langevin theory gives poor predictions for ion mobilities. The adjustable parameter, gamma, of the Mason-Schamp (12-6-4) potential function permits unique solution of the ion mobility for Cr(CO)5(-) in a wide range of neutral gases. The large values of gamma obtained for most of these systems imply, in terms of the Mason-Schamp theory, that the r to the minus 6th power contribution to the potential function is significant.
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Chemical Physics; 61; July 1
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  • 55
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    Three-dimensional tertiary structure of yeast phenylalanine transfer RNA (1974)
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    Publikationsdatum: 2019-06-27
    Beschreibung: Results of an analysis and interpretation of a 3-A electron density map of yeast phenylalanine transfer RNA. Some earlier detailed assignments of nucleotide residues to electron density peaks are found to be in error, even though the overall tracing of the backbone conformation of yeast phenylalanine transfer RNA was generally correct. A new, more comprehensive interpretation is made which makes it possible to define the tertiary interactions in the molecule. The new interpretation makes it possible to visualize a number of tertiary interactions which not only explain the structural role of most of the bases which are constant in transfer RNAs, but also makes it possible to understand in a direct and simple fashion the chemical modification data on transfer RNA. In addition, this pattern of tertiary interactions provides a basis for understanding the general three-dimensional folding of all transfer RNA molecules.
    Schlagwort(e): CHEMISTRY
    Materialart: Science; 185; Aug. 2
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  • 56
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    Drift mobility of holes in phenanthrene single crystals (1974)
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    Publikationsdatum: 2019-06-27
    Beschreibung: The temperature dependence of drift mobilities of holes in single crystals of phenanthrene was measured in the range from 203 to 353 K in three crystallographic directions. Below the anomaly temperature of 72 C, the mobility temperature dependences are consistent with the Munn and Siebrand slow-phonon hopping process in the b direction and the Munn and Siebrand slow-phonon coherent mode in the a and c prime directions. The drift mobility temperature dependences in crystals that have been cooled through the anomaly temperature in the presence of illumination and an electric field are consistent with the model of Spielberg et al. (1971), in which the hindered vibration of the 4,5 hydrogens introduces a new degree of freedom above 72 C.
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Chemical Physics; 60; Feb. 15
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  • 57
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    Direct synthesis of polypeptides - Polycondensation of alpha-amino acids by polymetaphosphate esters (1974)
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    Publikationsdatum: 2019-06-27
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Molecular Evolution; 3; 1, 19; 1974
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  • 58
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    On the asymmetric polymerization of aspartic acid enantiomers by Kaolin (1974)
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    Publikationsdatum: 2019-06-27
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Molecular Evolution; 3; 1, 19; 1974
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  • 59
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    The mechanism of the H2O-catalyzed chain photodecomposition of O3 and the reaction of HO with O3 (1974)
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    Publikationsdatum: 2019-06-27
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Photochemistry; 2; 1973-197
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  • 60
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    Hydrocarbons identified in extracts from estuarine water accommodated no. 2 fuel oil by gas chromatography-mass spectrometry (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: Results are presented on a computerized gas chromatograph-mass spectrometer analysis of methylene chloride and n-heptane extracts of a No. 2 fuel oil accommodated estuarine water sample. The analytical method is briefly described, and the limitations on the identifications are categorized. Some attempt was made to determine major and trace constituents in the water accommodate. Altogether 66 hydrocarbon compounds were identified specifically, and 75 compounds were partially identified. Seven compounds could be recognized as major constituents of the water accommodated oil and ten were present only as traces. The aromatic compounds found were alkyl benzenes, naphthalene, tetralin, indane, biphenyl, fluorene, anthracene, and some of their alkyl substituted isomers in the range of carbon numbers C7 to C15. Four n-alkanes, C10 to C13, were found along with four other assorted hydrocarbons.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-TM-X-72009
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    Interaction of gases with lunar materials (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: Quantitative efforts to assess the surface properties of lunar fines, particularly water induced porosity are discussed. Data show that: (1) changes induced in lunar fines are not visible in high energy electron micrographs, (2) scanning micrographs show no change in particle size distribution as a result of reaction with water, (3) water induced changes are internal to the particles themselves, (4) normal laboratory atmosphere blocks alteration reaction with water, and (5) surface properties of mature lunar soils appear to be almost independent of chemical composition and mineralogy, but there are some variations in their reactivity toward water.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-CR-140194
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  • 62
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    Kinetics of homogeneous nucleation in many component systems (1974)
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    Publikationsdatum: 2019-06-27
    Beschreibung: Reiss's classical treatment of the kinetics of homogeneous nucleation in a system containing two chemical components is extended to many-component systems. The formulation is analogous to the pseudo-stationary state theory of chemical reaction rates with the free energy as a function of the composition of the embryo taking the place of the potential energy as a function of interatomic distances.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-CR-139529 , WIS-TCI-510
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    Compatibility testing of spacecraft materials and space-storable liquid propellants (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: Compatibility measurements were made for aluminum 2219-T87 alloy and titanium 6Al-4V alloy in the presence of liquid fluorine and flox. Results of post test characterization after exposure durations of 61 and 70 weeks are presented. Results of the total test program are analyzed.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-CR-139281 , TRW-23162-6023-RU-00
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    An implicit semianalytic numerical method for the solution of nonequilibrium chemistry problems (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: The first order differential equation form systems of equations. They are solved by a simple and relatively accurate implicit semianalytic technique which is derived from a quadrature solution of the governing equation. This method is mathematically simpler than most implicit methods and has the exponential nature of the problem embedded in the solution.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-TM-X-71985
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    The prebiotic synthesis of deoxythymidine oligonucleotides (1974)
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    Publikationsdatum: 2019-06-27
    Beschreibung: Deoxythymidine 5 prime-triphosphate in the presence of deoxythymidine 5 prime-phosphate, cyanamide and 4-amino-5-imidazole carboxamide polymerizes under drying conditions at moderate temperatures (60 to 90 C) to yield oligonucleotides of up to four units in length. Enzymatic analysis indicated that the majority of these oligomers contained natural 3 prime-5 prime phosphodiester bonds. This reaction offers a possible method for the formation of deoxyoligonucleotides under primitive earth conditions.
    Schlagwort(e): CHEMISTRY
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    Microwave spectrum, structure, dipole moment, and Coriolis coupling of 1,1-difluoroallene (1974)
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    Publikationsdatum: 2019-06-27
    Beschreibung: Microwave spectra from 12.4 to 40.0 GHz were recorded for five isotopic species of 1,1-difluoroallene. A-type transitions were observed and R-branch assignments were made for the ground state and two vibrationally excited states. Several structural parameters of the compounds were determined. The dipole moment value obtained from Stark splitting was 2.07 plus or minus 0.03 D. A Coriolis coupling was observed between the two-low-frequency C = C = C bending modes.
    Schlagwort(e): CHEMISTRY
    Materialart: American Chemical Society; vol. 96
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    Isothermal transitions of a thermosetting system (1974)
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    Beschreibung: A study of the curing reactions of a cycloaliphatic epoxy resin/anhydride system by torsional braid analysis showed the existence of two critical isothermal temperatures - namely, the maximum glass transition temperature of the thermoset system and the glass transition temperature of the material at its gel point. Two rheologically active kinetic transitions occur during isothermal cure which correspond to gelation and vitrification. Three types of isothermal behavior occur. Methods for determining the time to gel and the time to vitrify, and also the two above-mentioned critical isothermal temperatures, have been developed. The time to gel obeyed the Arrhenius relationship, whereas the time to vitrify passed through a minimum. Application of these results to thermosetting systems in general is discussed in terms of the influence of molecular structure on the values of the critical isothermal temperatures.
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Applied Polymer Science; 18; 1974
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    Pyrolysis of amino acids - Mechanistic considerations (1974)
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    Beschreibung: Pyrolysis of several structurally different amino acids in a column at 500 C showed differences in the mechanisms and final products. The aliphatic protein amino acids decompose mainly by simple decarboxylation and condensation reactions, while the beta amino acids undergo deamination to unsaturated acids. Alpha amino acids with alpha alkyl substituents undergo an unusual intramolecular SN1 reaction with the formation of an intermediate alpha lactone which decomposes to yield a ketone. The alpha alkyl substituents appear to stabilize the developing negative charge formed by partial heterolytic cleavage of the alpha carbon - NH3 bond. The gamma and delta amino acids give 2-pyrrolidinone and 2-piperidone respectively, while the epsilon acids yield mixed products.
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Organic Chemistry; 39; 11, 1; 1974
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    Dicarboxylic acids in the Murchison meteorite (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: A large suite of aliphatic dicarboxylic acids was found in extracts from the carbonaceous chondrite. This suite includes many of the branched and straight chained isomers with up to nine carbon atoms. The large number of compounds and the isomeric distribution suggest that the acids are the product of an abiotic synthesis. The dicarboxylic acids found have been identified by their gas chromatography retention values and by comparison of their mass spectra with those of authentic standards.
    Schlagwort(e): CHEMISTRY
    Materialart: Nature; 251; Sept. 6
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  • 70
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    Photodissociative formation of ion pairs from molecular hydrogen and the electron affinity of the hydrogen atom (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Schlagwort(e): CHEMISTRY
    Materialart: AD-785789 , AROD-10831-2-C , Chemical Physics Letters; 25; Apr. 1
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  • 71
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    Fundamental investigation of ultraviolet radiation effects in polymeric film-forming materials (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A literature search from 1958 to present was conducted on the effect of ultraviolet radiation on polymeric materials, with particular emphasis on vacuum photolysis, mechanisms of degradation, and energy transfer phenomena. The literature from 1958 to 1968 was searched manually, while the literature from 1968 to present was searched by using a computerized keyword system. The primary objective was to provide the necessary background information for the design of new or modified materials with improved stability to the vacuum-radiation environment of space.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-CR-132493 , IITRI-C6295-10
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  • 72
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    Rock 14318 - A polymict lunar breccia with chondritic texture (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Rock 14318 is a complex microbreccia consisting of lithic fragments, chondrules, glass spherules, and glass and mineral fragments that are embedded into a fine-grained, partly glassy matrix. Compositions of lithic fragments, glasses and chondrules, in terms of compositional rock and rock suite equivalents, represent members of the ANT (anorthositic-noritic-troctolite) suite; the alkalic high-alumina basalt (KREEP) group; high-alkali quartz basalt; basalt; and dunite. The polymict nature of many lithic fragments suggests that rock 14318 requires at least two, and probably more, impact episodes for its formation. Final agglomeration took place while part of the material was hot, as is indicated by the welded texture, suggesting that the final impact event was a large one, producing a fiery cloud similar to a nuee ardente. The close similarity in texture of lunar rock 14318 to certain polymict-brecciated meteorites such as Siena suggests that meteorites of this type were also formed by complex and successive impact events on the surface of the meteorite parent body, rather than during agglomeration of the parent body.
    Schlagwort(e): CHEMISTRY
    Materialart: Geochimica et Cosmochimica Acta; 38; July 197
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  • 73
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    Mass spectrometry (1974)
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    Publikationsdatum: 2019-06-27
    Beschreibung: Review of the present status of mass spectrometry in the light of pertinent recent publications spanning the period from December 1971 to January 1974. Following an initial survey of techniques, instruments, and computer applications, a sharp distinction is made between the chemistry of organic (radical-)ions and analytical applications in biorganic chemistry and medicine. The emphasis is on the chemistry of organic (radical-)ions at the expense of inorganic, organometallic, and surface ion chemistry. Biochemistry and medicine are chosen because of their contemporary importance and because of the stupendous contributions of mass spectroscopy to these fields in the past two years. In the review of gas-phase organic ion chemistry, special attention is given to studies making significant contributions to the understanding of ion chemistry.
    Schlagwort(e): CHEMISTRY
    Materialart: Analytical Chemistry; 46; 5, Ap; Apr. 197
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  • 74
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    Apparent charge localization effects in the McLafferty rearrangement of acetate esters - Field ionization kinetic measurements (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Schlagwort(e): CHEMISTRY
    Materialart: Organic Mass Spectrometry; 8; 1974
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  • 75
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    Chemical evolution. XXI - The amino acids released on hydrolysis of HCN oligomers (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Major amino acids released by hydrolysis of acidic and basic HCN oligomers are identified by chromatography as Gly, Asp, and diaminosuccinic acid. Smaller amounts of Ala, Ile and alpha-aminoisobutyric acid are also detected. The amino acids released did not change appreciably when the hydrolysis medium was changed from neutral to acidic or basic. The presence of both meso and d, l-diaminosuccinic acids was established by paper chromatography and on an amino acid analyzer.
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Molecular Evolution; 3; 3, 19; 1974
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  • 76
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    Dual photon effects in nitrogen dioxide photolysis (1974)
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    Publikationsdatum: 2019-06-27
    Beschreibung: A previous study demonstrated two-photon consecutive absorption as being the most probable mechanism for the photodissociation of NO2 using a pulsed ruby laser at 6943 A. Additional data discussed here confirmed this and also examined an associated phenomenon, that of multiphoton induced fluorescence. The dissociation of NO2 by ON-O bond cleavage requires 3.4 eV, while the laser energy corresponds to 1.785 eV. The pooling of the energy of two photons would give more than enough energy to dissociate the NO2 into NO + O. Several mechanisms including (1) simultaneous absorption of two photons; (2) reaction of two singly excited NO2; (3) reaction of a singly excited NO2 with a ground state NO2; and (4) consecutive absorption of two photons were examined.
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Physical Chemistry; 78; Aug. 1
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  • 77
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    Trapped xenon in meteorites (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Xenon in meteorites can be resolved into a mixture of component X and trapped xenon with the following composition, Xe-124 : Xe-126 : Xe-128 : Xe-130 : Xe-131 : Xe-132 : Xe-134 : Xe-136 = 0.0276 : 0.0248 : 0.501 : 1.00 : 5.04 : 6.19 : 2.31 : 1.90. This trapped meteoritic xenon is distinct from xenon trapped in the average carbonaceous chondrite which is shown to represent the average composition of the total xenon in meteorites containing various mixtures of component X and trapped meteoritic xenon.
    Schlagwort(e): CHEMISTRY
    Materialart: Nature; 251; Sept. 6
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  • 78
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    Photoelectron spectroscopy of N2 and CO with dispersed NeI radiation (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: High resolution photoelectron spectra recorded from molecular nitrogen and carbon monoxide with a fully calibrated energy analyzer at both the 736 and 744 A Ne I lines are presented. The relative intensities of all vibrational peaks appearing in each spectrum are given.
    Schlagwort(e): CHEMISTRY
    Materialart: Chemical Physics Letters; 26; May 15
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  • 79
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    Comment on determination of the interaction potential between Ar and HCl (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: To test the accuracy of the Gordon-Kim theory of intermolecular forces, predicted and experimental values are compared for Ar-HCl. The method appears to accurately predict the short-range repulsive forces and also the position (but possibly not the depth) of the potential well.
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Chemical Physics; 60; Apr. 1
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  • 80
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    Reaction of HO2 with NO and NO2 (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: A kinetic study is made of the reaction of HO2 with NO2, and relative rate coefficients are derived for this reaction and for the reaction of HO2 with NO. It is shown that irradiation of mixtures of N2O-O2-H2 in the presence of small amounts of NO2 at 2139 A and 25 C leads to the consumption of NO2. The results clearly indicate that NO2 is consumed during irradiation to form a product which thermally decomposes to regenerate NO2 thermally and that this product is undoubtedly HONO. In the case of mixtures of N2O-O2-H2 and N2O-O2-H2-CO in the presence of small amounts of both NO and NO2 the NO2 pressure increases initially, reaches a maximum, and then decreases at a constant rate.
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Physical Chemistry; 78; Mar. 28
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  • 81
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    3 nu/sub 3/ band of C-13H4 (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Chemical Physics; 60; Jan. 15
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  • 82
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    Absolute rate parameters for the reaction of ground state atomic oxygen with carbonyl sulfide (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The rate parameters for the reaction of O(3P) with carbonyl sulfide, O(3P) + OCS yields CO + SO have been determined directly by monitoring O(3P) using the flash photolysis-resonance fluorescence technique. The value for k sub 1 was measured over a temperature range of 263 - 502 K and the data were fitted to an Arrhenuis expression with good linearity.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-TM-X-70749 , X-691-74-249
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  • 83
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    Matrix isolation technique for the study of some factors affecting the partitioning of trace elements (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: The factors that affect the preferred positions of cations in ionic solid solutions were investigated utilizing vibrational spectroscopy. Solid solutions of the sulfate and chromate ions codoped with La(+3) and Ca(+2) in a KBr host lattice were examined as a function of the polyvalent cation concentration. The cation-anion pairing process was found to be random for Ca(+2), whereas the formation of La(+3)-SO4(-2) ion pairs with a C2 sub v bonding geometry is highly preferential to any type of La(+3)-CrO4(-2) ion pair formation. The relative populations of ion pair site configurations are discussed in terms of an energy-entropy competition model which can be applied to the partition of trace elements during magmatic processes.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-CR-139618
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  • 84
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    Composition surveys of test gas produced by a hydrogen-oxygen-air burner (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: As a result of the need for a uniform hot gas test stream for fuel injector development for hydrogen fueled supersonic combustion ramjet engines, an experimental study of injector configuration effect on exit flow uniformity of a hydrogen fueled oxygen replenished, combustion burner was made. Measurements used to investigate the burner nozzle exit profiles were pitot and gas sample measurements. Gas composition and associated temperature profiles were reduced to an acceptable level by burner injector modifications. The effect of the injector modifications was to redistribute the hydrogen fuel, increase the air pressure drop, promote premixing of the oxygen and air, and establish a uniform flow pattern where the oxygen-air mixture comes into contact with the hydrogen fuel. The most sensitive phenomenon which affected the composition profiles was the uniformity of the air distribution supplied to the combustion chamber.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-TM-X-71964
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  • 85
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    Catalytic oxidation of trace levels of methane in oxygen in a tubular reactor (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: An experimental investigation of catalytic oxidation of trace levels of methane in oxygen was conducted in a tubular reactor. Two noble metal solid catalysts were explored: a 1-percent platinum on gamma alumina and a 0.5-percent rhodium on gamma alumina. For each catalyst the activity was determined as a function of temperature, pressure, space velocity, and methane concentration. The rhodium catalyst was considerably more active than the platinum catalyst. For each catalyst mass transfer had a pronounced effect upon activity at low space velocity.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-TN-D-7687 , E-7595
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  • 86
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    Enhancement of oxidative vaporization of chromium (III) oxide and chromium by oxygen atoms (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Rates of oxidative vaporization of Cr2O3 were found to be markedly enhanced in the presence of O atoms. Investigations were conducted over the temperature range 470 to 1520 K. For Cr2O3 the enhancement was about 10 to the 9th power at 820 K in oxygen containing 2.5 percent atoms. Rapid oxidative vaporization of bare chromium was observed below 1070 K, the rate being about one-half that of Cr2O3. Results are interpreted in terms of thermochemical analysis.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-TN-D-7629 , E-7789
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  • 87
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    Isomer effects on polyimide properties (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The polymerization of 2,4'-methylene-dianiline with benzophenone tetracarboxylic acid dianhydride yields high molecular weight polyamic acid. Polyimide is formed when films of the polyamic acid are cured between 200 - 300 C. A lower molecular weight polyamic acid is obtained from 2,2'-MDA with BTDA, but it appears that a lowering of the reaction temperature will yield high molecular weight polymer. Evaluation of these polymers is underway. Continued efforts to synthesize 2,3'- MDA and 2,3'-diaminobenzophenone have met with little success.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-CR-137413 , AR-1
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  • 88
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    High-temperature mass spectrometry - Vaporization of group 4-B metal carbides (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The high temperature vaporization of the metal-carbon systems TiC, ZrC, HfC, and ThC was studied by the Knudsen effusion - mass spectrometric method. For each system the metal dicarbide and tetracarbide molecular species were identified in the gas phase. Relative ion currents of the carbides and metals were measured as a function of temperature. Second- and third-law methods were used to determine enthalpies. Maximum values were established for the dissociation energies of the metal monocarbide molecules TiC, ZrC, HfC, and ThC. Thermodynamic functions used in the calculations are discussed in terms of assumed molecular structures and electronic contributions to the partition functions. The trends shown by the dissociation energies of the carbides of Group 4B are compared with those of neighboring groups and discussed in relation to the corresponding oxides and chemical bonding. The high temperature molecular beam inlet system and double focusing mass spectrometer are described.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-TN-D-7613 , E-7510
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  • 89
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    The photodetachment cross-section and threshold energy of negative ions in carbon dioxide (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: Threshold energy and sunlight photodetachment measurements on negative carbon dioxide ions, using a 2.5 kw light pressure xenon lamp, show that: (1) Electron affinity of CO3(+) is larger than 2.7 e.V. and that an isomeric form of CO3(+) is likely an error; (2) The photodetachment cross section of CO3(-) will roughly be like a step function across the range of 4250 to 2500A, having its threshold energy at 4250A; (3) Sunlight photodetachment rate for CO3(-) is probably much smaller than elsewhere reported; and (4) The probability of having photodetached electrons re-attach to form negative ions is less than 1%. Mass identifying drift tube tests confirm that the slower ion is CO3(-), formed through the O(-) + 2CO2 yields CO3(-) + CO2 reaction.
    Schlagwort(e): CHEMISTRY
    Materialart: NASA-CR-138025
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  • 90
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    Measurement of the effects of temperature and partial pressure of oxygen on the oxidation states of europium in silicate glasses (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Schlagwort(e): CHEMISTRY
    Materialart: Geochimica et Cosmochimica Acta; 38; Sept
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  • 91
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    EPR measurement of the effect of glass composition on the oxidation states of europium (1974)
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    Publikationsdatum: 2019-06-27
    Beschreibung: An investigation was conducted concerning the dependence of the concentration ratio of Eu(2+) to Eu(3+) on composition for silicate liquids whose compositional end members are CaAl2Si2O8 and MgSiO3, MG2SiO4, CaMgSi2O6, CaMgSiO4, CaSiO3, or Ca2SiO4. The liquids were quenched to produce glasses. An electron paramagnetic resonance spectrometer was used to determine the concentration ratios of Eu(2+) to Eu(3+) in the glasses.
    Schlagwort(e): CHEMISTRY
    Materialart: Geochimica et Cosmochimica Acta; 38; Sept
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  • 92
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    Interaction of gases with ablative composites. II - Water (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: An investigation was conducted to study the sorption of water on two ablative composites and their components as a function of pressure and temperature. A pressure range from 0.001 to 10 torr and a temperature range from 25 to 35 C were considered in the investigation. It was found that the sorption of water vapor by the ablative composites and their components varied directly with pressure. The components of the ablative composites included phenolic spheres, cork, a carbon-glass fiber mixture, glass spheres, silica fibers, and a silicone elastomer.
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Applied Polymer Science; 18; 1974
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  • 93
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    The bonding of ferrous iron to sulfur and oxygen in tetrahedral coordination - A comparative study using SCF X alpha scattered wave molecular orbital calculations (1974)
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    Publikationsdatum: 2019-06-27
    Schlagwort(e): CHEMISTRY
    Materialart: Geochimica et Cosmochimica Acta; 38; July 197
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  • 94
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    Chemical evolution. XXII - The hydantoins released on hydrolysis of HCN oligomers (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: The isolation of three hydantoins from HCN oligomers is described. One of these hydantoins, 5-carboxymethylidine hydantoin (5-CMH), rearranges to pyrimidine orotic acid in basic solution. The isolation of 5-CMH suggests the possibility that pyrimidines were formed directly from HCN on the primitive earth.
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Molecular Evolution; 3; Sept. 10
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  • 95
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    Kinetics of the reaction of OH with HCl (1974)
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    Publikationsdatum: 2019-06-27
    Beschreibung: Measurements results are presented for the rate constant of the reaction OH + HCl yields H2O + Cl determined in a flow tube over the temperature range of 224 to 460 K using resonance fluorescence detection of OH. Stratospheric and reaction kinetic implications are briefly discussed.
    Schlagwort(e): CHEMISTRY
    Materialart: Chemical Physics Letters; 27; Aug. 15
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  • 96
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    Beam maser measurements of CH3OH rotational transitions (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Precise measurements of rotational transitions in methanol are reported that were made by means of beam maser spectrometers. No hyperfine structure was resolved at a resonance line width of 8 kHz. Accurate center frequencies for the transitions measured are useful for determining Doppler shifts for observed interstellar lines.
    Schlagwort(e): CHEMISTRY
    Materialart: Astrophysical Journal; 191; July 15
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  • 97
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    Temperature dependence of the reactions of OH and HO2 with O3 (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Recent steady-state experiments involving the photolysis of O2-H2O mixtures at 1849 A conducted by DeMore (1973) have provided direct evidence for the catalytic cycle involving a reaction of ozone with OH in the first step and a reaction of ozone with HO2, which is produced in the first reaction, in the second step. The measurements of the rate constants for these reactions which had first been conducted at room temperature are now extended to the temperature range from 0 to 69 C.
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Physical Chemistry; 78; July 18
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  • 98
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    Shock-tube study of carbon monoxide dissociation kinetics (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Carbon monoxide dissociation-rate data were obtained over the temperature range 5600-12,000 K. The experiments were conducted with undiluted CO to emphasize rate constants applicable to molecular gas systems. Data were obtained as time-resolved pressure measurements on the end wall of a shock tube and, in some cases, as emission histories of the C2 Swan system (0-0 band) behind incident shock waves. Results confirm the presence of C2 as an intermediate species in CO decomposition.
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Chemical Physics; 60; June 15
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  • 99
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    Analysis of multiple pulse NMR in solids. II (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: A systematic method, an extension of the average Hamiltonian formalism, is presented for calculating the effects of pulse errors and imperfections in the multiple pulse nuclear magnetic resonance experiments. Application of this method to account for effects of pulse nonidealities such as phase errors, phase transient effects, pulse size errors, and rf inhomogeneity is found to agree with experimental observation, and the results furnish a basis for understanding the complex couplings between the pulse errors and other interactions such as the dipolar and the chemical shift Hamiltonians.
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Chemical Physics; 60; June 1
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  • 100
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    Foreign inclusions in stony meteorites. II - Rare gases and oxygen isotopes in a carbonaceous chondritic xenolith in the Plainview gas-rich chondrite (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Foreign inclusions in stony meteorites. II - Rare gases and oxygen isotopes in a carbonaceous chondritic xenolith in the Plainview gas-rich chondrite
    Schlagwort(e): CHEMISTRY
    Materialart: Geochimica et Cosmochimica Acta; 38; June 197
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