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  • 1
    Digitale Medien
    Digitale Medien
    Review of electrolytic conductance standards (1987)
    Springer
    Journal of solution chemistry 16 (1987), S. 985-997 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Aqueous solution ; cell constant ; conductance ; electrolytic conductivity ; potassium chloride ; primary ; resistance ; resistivity, secondary, standards, and temperature scale
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Measurements of aqueous electrolytic conductance are performed routinely in a variety of disciplines and industries. Conductivity is a measure of the ionic content in solution and thus has applications in pharmaceuticals, power plants, rainwater, lake surveys, and oceanography, to name a few. A thorough review of the measurement of and standards for aqueous electrolytic conductance is herein presented. At present, the most precise and accurate standards have been set forth by the International Organization of Legal Metrology (OIML), and have been adopted by most other standards organizations. However, the uncertainty assigned to these standards, especially the secondary standards, is somewhat larger than would be expected from the physical aspects of the measurement. Several changes in the units and measurement scales, including temperature, volume, molar mass, resistance, and concentration obfuscate the accuracy of these standards. In addition to the review, research is proposed, using a conductance cell with variable length, to establish new standards for aqueous electrolytic conductance.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00652583
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  • 2
    Digitale Medien
    Digitale Medien
    Determination of the absolute specific conductance of primary standard KCl solutions (1989)
    Springer
    Journal of solution chemistry 18 (1989), S. 515-528 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Absolute standard ; conductivity cell ; demal ; electrolyte ; molality ; potassium chloride ; primary standard ; specific conductance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A determination of the absolute specific conductance of KCl solutions is demonstrated. The measurement is based on the conductance cell with a well defined geometry, having a difference in the removable center tube of accurately measured dimensions. The specific conductance of the solution is obtained from the measured resistances of the cell with and without the center tube and the measured l/A ratio of the center tube. Specific conductances obtained using the cell agree with the previously accepted standards for 0.1 demal and 0.01 demal solutions within 0.02%. Results are also presented for solutions based on molality. The temperature control, bridge, and detector technology used to obtain results of this accuracy are described.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00664234
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Deuterium chloride ; deuterium oxide ; electrochemical cell ; emf ; enthalpy ; entropy ; free energy ; heat capacity ; isotope effect ; standard potential ; thermodynamics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00644599
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  • 4
    Digitale Medien
    Digitale Medien
    77Se and125Te nuclear magnetic resonance investigations in II–VI and IV–VI compounds (1978)
    Springer
    The European physical journal 289 (1978), S. 17-20 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The NMR signals of77Se or125Te have been measured in II–VI and IV–VI-compounds ZnSe, CdSe, HgSe, PbSe and ZnTe, CdTe, HgTe, PbTe relative to aqueous solutions of Na2SeO3 or K2TeO3. The chemical shifts of about −600 ppm for77Se and of about −2700 ppm for125Te have been compared with theoretical calculations. For77Se in hexagonal CdSe an anisotropic chemical shift has been observed and for125Te in CdTe and PbTe linesplittings have been found. The linewidths of the77Se and125Te NMR signals increase with the atomic number of the counterions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01408490
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  • 5
    Digitale Medien
    Digitale Medien
    Results from DASP one + e − annihilation between 3.1 and 5.2 GeV (1979)
    Springer
    The European physical journal 1 (1979), S. 233-256 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract This paper summarizes the measurements one + e − annihilation performed by the DASP Collaboration in the energy range between 3.1 and 5.2 GeV. The following topics are covered: total cross section, production and two body decays of the narrow resonances, radiative decays of theJ/ψ and ψ′ resonances and evidence for theX(2.82), ψ′ cascade decays, inclusive η production and evidence for theF meson, semileptonic decays of charmed mesons and properties of the heavy lepton.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01440224
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  • 6
    Digitale Medien
    Digitale Medien
    Verzeichnis der Sammlung von Algenkulturen am Pflanzenphysiologischen Institut der Universität Göttingen (1964)
    Springer
    Archives of microbiology 47 (1964), S. 402-432 
    Details
    ISSN: 1432-072X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00406362
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  • 7
    Digitale Medien
    Digitale Medien
    Direct resonances in Orr-Sommerfeld problems (1986)
    Springer
    Acta mechanica 59 (1986), S. 11-29 
    Details
    ISSN: 1619-6937
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Summary This paper deals with possible modal degeneracies between spatial Orr-Sommerfeld model in plane Poiseuille and boundary-layer type mean flows. In analogy to the Benney-Gustavsson resonance mechanism exact modal coalescences can be observed for three-dimensional disturbances. At these direct resonances linear theory implies a locally algebraic growth and the corresponding potentially, large amplitudes may initiate the nonlinear state.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01177057
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  • 8
    Digitale Medien
    Digitale Medien
    Buchbesprechungen (1961)
    Springer
    Colloid & polymer science 177 (1961), S. 162-165 
    Details
    ISSN: 1435-1536
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01521203
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  • 9
    Digitale Medien
    Digitale Medien
    Magnetic susceptibility of a one-dimensional Fermi system and dielectric function of a two-dimensional Coulomb gas (1977)
    Springer
    The European physical journal 28 (1977), S. 117-127 
    Details
    ISSN: 1434-6036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A relation between the magnetic susceptibilityχ(k, ω) of an interacting 1-D Fermi system and the dielectric functionε(q) of a 2-D Coulomb gas is established. By applying a cluster-expansion technique and by using known results for the pair-correlation function of the Coulomb gas we obtain a number of expressions forε(q) which apply in different regions of theq-plane and in different temperature intervals. These results supplement the existing picture of the transition from non-metallic to metallic behaviour occurring in the 2-D Coulomb gas as the temperature increases. The relation betweenε(q) andχ(k, ω) is then used to derive explicit expressions forχ(k, ω) from these results forε(q). The change in the dielectric response of the 2-D Coulomb gas is reflected by a change in the magnetic response of the 1-D Fermi system: as a function of the spin non-flip coupling constantγ ∥ the susceptibility of the Fermi system changes from normal paramagnetic behaviour to non-magnetic behaviour characteristic of a bound singlet-spin ground state, asγ ∥ decreases. Our result for the gap in the spin excitation spectrum of the Fermi system is in agreement with the results of other authors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01325450
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  • 10
    Digitale Medien
    Digitale Medien
    Correlations between the orientation of magnetic recording media determined by Mössbauer Spectroscopy and magnetic methods (1986)
    Springer
    Hyperfine interactions 29 (1986), S. 1499-1502 
    Details
    ISSN: 1572-9540
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The orientation of the easy magnetization axis of magnetic particles is a key parameter of the recording performance of magnetic recording media. Usually the orientation is measured by magnetic methods, but the applicability of the Mössbauer Spectroscopy has also been shown in the past. We show up and discuss the correlations between the results obtained by magnetic and Mössbauer measurements for the example of several magnetic tapes. We demonstrate that by a combination of both methods we are even able to estimate the mean canting angles distribution width of the easy axis of magnetization.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02399519
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