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  • 1
    Digitale Medien
    Digitale Medien
    Second ionization of carbonic acid in NaCl media to 250°C (1984)
    Springer
    Journal of solution chemistry 13 (1984), S. 647-661 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Ionization ; carbonic acid ; equilibrium ; high temperature ; thermodynamics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The equilibrium quotients for the first ionization of aqueous carbon dioxide were previously determined at this laboratory. A similar potentiometric technique has now been employed to determine the second ionization quotients in NaCl media to 5m and from 50 to 250°C. The results have been combined with selected information in the literature and modeled to derive thermodynamic parameters including equilibrium constants, activity coefficient quotients, changes in enthalpies and changes in heat capacity along the saturation pressure curve. Approximate values for pressure coefficients were obtained to permit the short extrapolations from experimental conditions to the saturation pressure condition. The results demonstrate that log K2/Kw, when plotted vs. 1/T, gives nearly a straight line as has been observed for a number of other such processes. This provides the best means of extrapolation beyond the temperature of the measurements. The results have been applied to an examination of the solubility of calcite (calcium carbonate) as a function of hydrogen ion molality (in a given NaCl medium) for the condition where the calcium ion molality equals the total carbonate molality (in all forms).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00650372
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Strawberry foliage headspace vapor components at periods of susceptibility and resistance toTetranychus urticae Koch (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 789-796 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Fragaria ananassa ; two-spotted spider mite ; Tetranychus urticae ; Acari ; Tetranychidae ; headspace compounds ; methyl salicylate ; seasonal resistance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Headspace components from strawberry foliage have been isolated by nitrogen entrainment and Tenax trapping. Traps were eluted with hexane, and components were analyzed by gas chromatography-mass spectrometry. Fifteen compounds were identified by comparison with authentic standards,trans-2-hexenal, 1-hexanol,trans-2-hexen-1-ol,cis-3-hexen-1-ol, hexyl acetate,cis-3-hexenyl acetate, 6-methyl-5-hepten-2-ol, 1-octanol, 1-octen-3-ol, linalool, α-terpineol, methyl salicylate, ethyl saiicylate, benzyl alcohol, and 2-phenylethanol. The relative amounts of these components were compared at flowering and after fruit harvest when plants were more resistant to the two-spotted spider mite,Tetranychus urticae Koch. The predominant components,cis-3-hexen-1-ol and its acetate, did not change markedly between the sampling periods, but methyl salicylate increased approximately 10-fold after fruit harvest. Methyl salicylate at low concentrations under bioassay conditions did not affect mite behavior. The biosynthetic relationship of this compound to other phenols which have been implicated in plant resistance is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01018773
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    A regular boundary element method for fluid flow (1982)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 2 (1982), S. 239-251 
    Details
    ISSN: 0271-2091
    Schlagwort(e): Regular ; Discontinuous Boundary Elements ; Fluid Flow ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: The Boundary Element Method is now well established as a valid numerical technique for the solution of field problems, equal to the Finite Element Method in generality and surpassing it in computational efficiency in some cases.1 In this paper is presented a 'Regular Boundary Element Method' as applied to inviscid laminar fluid flow problems. It involves the formation of a system of regular integral equations obtained by moving the singularity outside the domain of the given problem. It is also shown that non-conforming elements may be used whereby freedoms are not defined at the geometric nodes under the boundary element discretization. A linear element is developed here; higher order variants could easily be defined. Satisfactory numerical results have been obtained using the proposed regular method with both conventional (continuous across the boundary) and non-conforming boundary elements for two-dimensional inviscid laminar fluid flow problems having regular and singular solutions.
    Zusätzliches Material: 14 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/fld.1650020303
    Standort Signatur Erwartet Verfügbarkeit
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