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  • Springer  (14)
  • 1990-1994  (10)
  • 1985-1989  (4)
  • 1
    Electronic Resource
    Electronic Resource
    IR-diode laser measurements on the decomposition of NO behind shock waves (1992)
    Springer
    Experiments in fluids 13 (1992), S. 299-304 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The decomposition of NO diluted in Ar was measured in the temperature range 2,500 K ⩽ T ⩽ 3,500 K at pressures between 0.5 and 1.9 bar using the shock tube method. The gas mixtures containing 10 to 25% NO in Ar were shock heated and the time-dependent NO concentrations were monitored by using a tunable IR-diode laser. The measured NO concentration profiles in the post-shock reaction zone were interpreted by means of computer simulations. With a reaction mechanism developed by Thielen and Roth (1984) nearly complete agreement between calculated and measured NO concentration profiles was obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00209501
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  • 2
    Electronic Resource
    Electronic Resource
    First observations on break-up of particle agglomerates in shock waves (1987)
    Springer
    Experiments in fluids 5 (1987), S. 86-94 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The destruction of solid agglomerates suspended in argon by means of shock waves (1 〈M s 〈 5) has been studied experimentally using a conventional shock tube apparatus. The change in particle size was measured by time-dependent in situ laser light scattering of the particle ensemble in the shock wave. The test facilities used are given in details, and the principle of the Mie-theory, necessary for complete understanding of the data reduction, is described. In this paper data reduction and first analysis employing two independent trial solutions involving the Mie-theory for polydisperse, spherical particle-ensembles are presented. Three types of agglomerates suspended in argon with a mean initial size of about 1 gm were exposed to the shock wave and different size reduction behaviours were observed. The deagglomeration effect depends largely on the wave intensity and on the physico-chemical structure of the particle aggregates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00776178
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  • 3
    Electronic Resource
    Electronic Resource
    Stoßwellen in Gas-Partikel-Gemischen mit Massenaustausch zwischen den Phasen (1985)
    Springer
    Heat and mass transfer 19 (1985), S. 101-111 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Die Nichtgleichgewichts-Austauschprozesse, die in einem Gas-Partikel-Gemisch hinter einer Stoßwelle ablaufen, werden in dieser Arbeit untersucht. Sie werden sowohl mit den Erhaltungsgleichungen für zwei interaktive Kontinua als auch mit den vereinfachten Gleichungen für Einzelpartikel in einem Gaskontinuum beschrieben. Der besondere Akzent liegt auf den Transportvorgängen sehr kleiner Partikel, die im Übergangsbereich zwischen Kontinuumsbedingungen und freier Molekülströmung stattfinden. Sie werden durch einfache Knudsenzahlansätze berücksichtigt. Beispiele zeigen die Geschwindigkeits-, Temperatur- und Partikelgrößenrelaxation hinter Stoß-wellen in Argon mit DOP-Tröpfchen und mit festen NaCl-Salzpartikeln.
    Notes: Abstract The nonequilibrium transfer processes, which take place in a gas-particle mixture behind shock waves, are investigated in this study. They will be described both by the conservation equations of two interactiv continua and by the simplified equations of a single particle in a gas continuum. The special accent is on exchange processes of very small particles, which take place in the transition regime between continuum and free molecular conditions. They are taken into account by simple Knudsen number corrections. Examples show the velocity, the temperature and the particle size relaxation behind shock waves in argon containing DOP droplets or solid NaCl particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01682553
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  • 4
    Electronic Resource
    Electronic Resource
    A shock tube study on the thermal decomposition of CS2 based on S(3P) and S(1D) concentration measurements (1994)
    Springer
    Shock waves 4 (1994), S. 95-99 
    Details
    ISSN: 1432-2153
    Keywords: ARAS ; Chemical shock tube ; Thermal decomposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract The thermal decomposition of CS2 highly diluted in Ar was studied behind reflected shock waves by monitoring time-dependent absorption profiles of S(3P) and S(1D) using atomic resonance absorption spectroscopy (ARAS). The rate coefficient of the reaction: (R1) $$\begin{gathered} CS_2 + M\mathop \to \limits^{k_1 } CS + S + M, \hfill \\ k_1 = 5.1 \times 10^{14} \exp \left( {\frac{{ - 38150K}}{T}} \right)cm^3 mol^{ - 1} s^{ - 1} \hfill \\ \end{gathered} $$ . was determined in experiments with initial concentrations of CS2 between 5 and 50 ppm at post-shock conditions of 2300 K≤T≤3360 K and total densities between 2.2×1018 cm−3 and 3.9×1018 cm−3. In experiments with higher initial concentrations of 100 ppm CS2 in Ar, the S(3P) concentrations were found to reach quasi-stationary values. From the steady state assumption a value for the rate coefficient of the most probable S consuming reaction: (R2) $$\begin{gathered} CS_2 + S\mathop \rightleftharpoons \limits^{k_2 } CS + S_2 , \hfill \\ k_2 \approx 1.2 \times 10^{13} cm^3 mol^{ - 1} s^{ - 1} \hfill \\ \end{gathered} $$ . was estimated at temperatures between 2100 K and 2340 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01418572
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  • 5
    Electronic Resource
    Electronic Resource
    Chromosome banding study of European catfish, Silurus glanis (Pisces, Siluridae) (1991)
    Springer
    Genetica 83 (1991), S. 153-157 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The karyotype of European catfish (Silurus glanis L.) was analyzed sequentially by means of silver staining and the chromomycin A3 (CMA3)/distamycin A (DA)/DAPI fluorescence technique and by C-banding, respectively. The nucleolus organizer regions (NORs) were localized on the submetacentric pair No. 14. Brilliant CMA3 fluorescent heterochromatin blocks corresponded to the NORs visualized by silver staining. No DA/DAPI-bright positive fluorescent patterns were detected while C-banding led to the detection of specific banding patterns on several chromosome pairs.—Using these banding data, the karyotype of S. glanis was redescribed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00058532
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  • 6
    Electronic Resource
    Electronic Resource
    Intestinal absorption of tellurium studied with stable tracers (1993)
    Springer
    Journal of radioanalytical and nuclear chemistry 170 (1993), S. 433-442 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract An investigation on tellurium metabolism by administration of stable tellurium isotopes124Te and126Te has been performed. Fractional intestinal absorption was determined in rabbits by the double tracer technique. The investigated subjects were given an enriched solution of one tellurium isotope orally and a few minutes later an enriched solution of the other isotope intravenously. The124Te and126Te contents in plasma samples were determined by proton nuclear activation. The methodology described offers a means to study tellurium metabolism in humans without radiation risk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02041479
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  • 7
    Electronic Resource
    Electronic Resource
    Stable and radioactive tracers in Ru biokinetic studies (1994)
    Springer
    Journal of radioanalytical and nuclear chemistry 178 (1994), S. 407-415 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The feasibility of ruthenium metabolism studies by stable tracer administration, with a methodology based on proton nuclear activation, is presented. In order to test that the amount of stable tracer administered does not perturb significantly the mechanism investigated, a series of comparative experiments with administration of both radioactive and stable tracers has been performed on animals. As the most critical pathway seems to be the intravenous injection, four male rabbits were given an intravenous injection of radioactive106Ru. Successively, the rabbits were given either a further injection of radioactive106Ru or injection of different quantities of natural Ru. The activity of106Ru and the concentration of natural Ru were measured in plasma samples withdrawn at different time intervals from the injections and the results were compared. Some biokinetic parameters and tissue distribution of Ru in rabbits were determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02039734
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  • 8
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    First observations on break-up of particle agglomerates in shock waves (1987)
    Springer
    Details
    Publication Date: 1987-01-01
    Print ISSN: 0723-4864
    Electronic ISSN: 1432-1114
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 9
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    IR-diode laser measurements on the decomposition of NO behind shock waves (1992)
    Springer
    Details
    Publication Date: 1992-09-01
    Print ISSN: 0723-4864
    Electronic ISSN: 1432-1114
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 10
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    Chromosome banding study of European catfish, Silurus glanis (Pisces, Siluridae) (1991)
    Springer
    Details
    Publication Date: 1991-01-01
    Print ISSN: 0016-6707
    Electronic ISSN: 1573-6857
    Topics: Biology
    Published by Springer
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