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  • General Chemistry  (3)
  • ACOUSTICS  (2)
  • enthalpy  (2)
  • 5'-O-demethyl-8-O-methyl-dioncophylline A
  • 1
    Electronic Resource
    Electronic Resource
    5'-O-demethyl-8-O-methyl-7-epi-dioncophylline a and its 'regularly' configurated atropisomer from Triphyophyllum peltatum
    Amsterdam : Elsevier
    Phytochemistry 36 (1994), S. 1057-1061 
    Details
    ISSN: 0031-9422
    Keywords: 5'-O-demethyl-8-O-methyl-7-epi-dioncophylline A ; 5'-O-demethyl-8-O-methyl-dioncophylline A ; Dioncophyllaceae ; Triphyophyllum peltatum ; atropisomerism. ; biaryls ; naphthylisoquinoline alkaloids ; stem bark
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)90491-6
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of DCl in D2O solution from 5 to 50°C (1986)
    Springer
    Journal of solution chemistry 15 (1986), S. 675-692 
    Details
    ISSN: 1572-8927
    Keywords: Deuterium chloride ; deuterium oxide ; electrochemical cell ; emf ; enthalpy ; entropy ; free energy ; heat capacity ; isotope effect ; standard potential ; thermodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The themodynamic properties of solutions of deuterium chloride (DCl) in deuterium oxide (D2O) have been determined from emf measurements of the electrochemical cell without transference from 5 to 50°C, and from 0.002 to 1.0 mol-kg−1. The standard potential of the silver/silver chloride electrode relative to the platinum/deuterium electrode has been determined. An equation for the Gibbs energy as a function of temperature has been derived from which the enthalpy, entropy, and heat capacity have been computed. Equations for the activity coefficient and the osmotic coefficient of DCl in D2O have been developed. The excess Gibbs energy of the solution and the excess partial molar free energy as a function of temperature have been calculated, from which the other excess thermodynamic properties have been computed. The values for the heat capacity and the apparent molar heat capacity have been compared with calorimetric data in the literature. The relative partial molar enthalpy has been calculated. The solvent isotope effect on the excess thermodynamic functions is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644599
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Thermodynamics of the Second Dissociation Constant and Standards for pH of 3-(NMorpholino) Propanesulfonic Acid (MOPS) Buffers from 5 to 55°C (1998)
    Springer
    Journal of solution chemistry 27 (1998), S. 73-87 
    Details
    ISSN: 1572-8927
    Keywords: Dissociation constant ; buffers ; NaMOPS ; temperature dependence ; emf ; Gibbs energy ; enthalpy ; entropy ; heat capacity ; zwitterion ; liquid junction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The second dissociation constant pK2 of 3-(N-morpholino)propanesulfonic acid (MOPS) has been determined at eight temperatures from 5 to 55°C by measurements of the emf of cells without liquid junction, utilizing hydrogen electrodes and silver–silver chloride electrodes. The pK2 has a value of 7.18 ± 0.001 at 25°C and 7.044 ± 0.002 at 37°C. The thermodynamic quantities ΔG°, ΔH°, ΔS°, and ΔC p o have been derived from the temperature coefficients of the pK 2. This buffer at ionic strength I = 0.16 mol-kg−1 close to that of blood serum, has been recommended as a useful secondary pH standard for measurements of physiological fluids. Five buffer solutions with the following compositions were prepared: (a) equimolal mixture of MOPS (0.05 mol-kg−1) + NaMOPS, (0.05 mol-kg−1); (b( MOPS (0.05 mol-kg−1) + NaMOPS (0.05 mol-kg−1) + NaCl (0.05 mol-kg−1); (c) MOPS (0.05 mol-kg−1) + NaMOPS (0.05 mol-kg−1); + NaCl (0.11mol-kg−1); (d) MOPS (0.08 mol-kg−1) + NaMOPS (0.08 mol-kg−1); and (e)MOPS (0.08 mol-kg−1) + NaMOPS (0.08 mol-kg−1) + NaCl (0.08 mol-kg−1).The pH values obtained by using the pH meter + glass electrode assembly are compared with those measured from a flow–junction calomel cell saturated with KCl (cell B), as well as those obtained from cell (A) without liquid junction at 25 and 37°C. The conventional values of the liquid junction potentials E j have been obtained at 25 and 37°C for the physiological phosphate reference solution as well as for the MOPS buffers (d) and (e) mentioned above.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022692629289
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  • 4
    Electronic Resource
    Electronic Resource
    Fortschritte in der MikrochemieBeitrag I dieser Reihe: Roth, „Quantitative organische Mikroanalyse“ s. diese Ztschr. 53, 44 [1940].. II. Mikroanalytische Prüfverfahren zur Untersuchung von Eisen und StahlErscheint. gleichzeitig in Techn. Mitt. Krupp, Forschungsber. 3, 255 [1940].. Bestimmung von Kohlenstoff, Eisen, Silicium, Mangan, Phosphor, Schwefel, Aluminium, Stickstoff, Chrom, Nickel, Molybdän, Wolfram, Titan, Vanadin und ihre Trennung (1940)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 53 (1940), S. 537-549 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19400534702
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  • 5
    Electronic Resource
    Electronic Resource
    Spektrochemische Untersuchungen zur Mikroanalyse des Stahlgefüges (1956)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 68 (1956), S. 296-302 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Spektralanalytisch sind in isolierten Gefügebestandteilen des Stahls noch Spuren erfaßbar, die mikroanalytisch nicht bestimmt werden können. Spektralunempfindliche Elemente müssen zusätzlich mikroanalytisch erfaßt werden. Die sehr stark wechselnde Zusammensetzung der isolierten Teilchen erforderte ein leitprobenfreies spektralanalytisches Verfahren. Analysenmethoden für Einwaagen von 0,05 mg Substanz und eine dazugehörige Mikromanipulation wurden ausgearbeitet. Der Zeitaufwand ist gegenüber der Mikroanalyse gering. Die Verfahren sind nicht auf Stahl beschränkt, sondern können für viele analytische Arbeiten nützlich sein.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19560680807
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  • 6
    Electronic Resource
    Electronic Resource
    Mikroanalytische Aufgaben in Metallkunde und Metallurgie (1952)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 64 (1952), S. 187-195 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Microanalytical Problems in Metallography and MetallurgyMicroanalysis has become increasingly important in metallographic analyses during recent years. This paper shows the particular problems with reference to the investigation of the structure of iron and steel. It has been possible to determine important new information concerning carbide and oxide occlusions, as well as those of nitrides, sulphides and intermetallic compounds. Particular attention is paid to the problems arising in taking the samples.
    Notes: Die Mikroanalyse hat in den letzten Jahren für die metallkundliche Analyse sehr an Bedeutung gewonnen. Es wird hier gezeigt, welche Aufgaben ihr besonders bei der Gefügeforschung an Stahl und Eisen gestellt werden. Es ist gelungen, wesentliche neue Erkenntnisse über Carbide und oxydische Einschlüsse und solche von Nitriden, Sulfiden und intermetallischen Verbindungen zu erhalten. Besondere Sorgfalt wird den bei den Probenahmen auftretenden Problemen gewidmet.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19520640704
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  • 7
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    Unknown
    On eigensolutions for discontinuous liners in a duct containing uniform mean flow (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Sound attenuation in a rectangular acoustically lined duct containing uniform mean flow is analytically investigated using the generalized Wiener-Hopf technique. Uniqueness of the solution is enforced for lined sections of the finite axial extent by imposing edge conditions at the liner interface. Possible edge conditions are considered, including the Kutta condition, and the causal solution corresponding to edge conditions is considered the best choice. Solution methods such as the mode matching and singularity methods imply differing edge conditions, and results show that power attenuation is insensitive to the imposed edge conditions, although significant differences are observed for the reflection coefficient. The amplitude of the exponentially increasing instability mode in the lined section must be set to zero as a first approximation to the nonlinear situation, and results indicate that measurements of the reflection factor can be used to make a more definite decision about physically appropriate edge conditions.
    Keywords: ACOUSTICS
    Type: AIAA PAPER 81-2017 , Aeroacoustics Conference; Oct 05, 1981 - Oct 07, 1981; Palo Alto, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
    facet.materialart.
    Unknown
    On the attenuation of sound by three-dimensionally segmented acoustic liners in a rectangular duct (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Axial segmentation of acoustically absorbing liners in rectangular, circular or annual duct configurations is a very useful concept for obtaining higher noise attenuation with respect to the bandwidth of absorption as well as the maximum attenuation. As a consequence, advanced liner concepts are proposed which induce a modal energy transfer in both cross-sectional directions to further reduce the noise radiated from turbofan engines. However, these advanced liner concepts require three-dimensional geometries which are difficult to treat theoretically. A very simple three-dimensional problem is investigated analytically. The results show a strong dependence on the positioning of the liner for some incident source modes while the effect of three-dimensional segmentation appears to be negligible over the frequency range considered.
    Keywords: ACOUSTICS
    Type: NASA-TM-80118
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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