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  • 1
    Electronic Resource
    Electronic Resource
    Jet characteristics in confined swirling flow (1985)
    Springer
    Experiments in fluids 3 (1985), S. 221-230 
    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 Jets in confined swirling flow are investigated in a facility where the swirling flow in the tube is produced by a vane-type swirler. The jet is located centrally in the swirler, and the diameter ratio of the tube to the jet is ∼ 14. Both the jet and the swirling flow are fully turbulent. Results show that the confined jet is highly dissipative in nature. Consequently, the flow in the tube does not resemble a free jet with axial pressure gradient. The presence of swirl increases the rate of dissipation and the jet decays even faster. A fairly isotropic turbulence field is observed in the confined swirling flow. However, the introduction of the jet does not significantly affect this behavior and near isotropy of the turbulence field is again observed at ∼ 30 jet diameters downstream.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265105
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  • 2
    Electronic Resource
    Electronic Resource
    Concentration distributions in a model combustor (1986)
    Springer
    Experiments in fluids 4 (1986), S. 107-113 
    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 A hot-wire concentration probe with a spatial resolution of 0.13 mm is used to measure concentration in a model cylindrical combustor. The flow inside the combustor is simulated by injecting a helium jet into a cylindrical confinement with or without swirling air flow present. Mean concentrations are essentially zero outside of the jet region, indicating complete confinement of the scalar field by the swirling flow. Consequently, concentration fluctuations are found to be relatively weak compared to velocity fluctuations, and are maximum off-axis at a point which corresponds to the interface between helium and air flows. However, in the absence of a swirling air flow, the helium diffuses quickly to fill the combustor. The resulting helium concentrations are constant and do not resemble the jet-like behavior of the velocity field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00266567
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Examination of a generalized model for radiationless energy transfer in dyes. Comparisons of theory and experiments (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 2892-2897 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A modified general model for radiationless energy transfer is examined. The model does not rely on selection criteria and is intended to apply over the range of diffusion and resonance energy transfer parameters normally encountered in quenching experiments. Experimental data is compared with theoretical predictions and found to confirm the model's validity for a wide range of physical conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456959
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  • 4
    Electronic Resource
    Electronic Resource
    Comprehensive examination of radiationless energy transfer models in dyes: Comparisons of theory and experiment (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 1484-1491 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Experimental data on radiationless energy transfer, covering a wide range of physical conditions, was compared with predictions developed from three different theoretical models, to define and determine their respective validities and range of applicability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456091
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  • 5
    Electronic Resource
    Electronic Resource
    Optical refractive and reflective properties of resonantly absorbing media (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 3838-3845 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Experiments on the reflection of polarized monochromatic laser light at the planar interface of resonantly absorbing medium and the air were made for a variety of situations, including Brewster's angle in the spectral vicinity of the resonance wavelength. An ethanolic solution of Rhodamine B, an organic laser dye luminofor with a well defined resonance absorption spectrum, was chosen as the absorbing medium. The tunable polarized output of a cw dye laser was used to provide the collimated monochromatic beam. To compare the experimental results with theory, the Fresnel reflectivity equations combined with the Kramers–Kronig relations were used to predict the reflectance in terms of the known absorption coefficient. The experimental results generally confirm the theoretical predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456869
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  • 6
    Electronic Resource
    Electronic Resource
    Density effects on jet characteristics in confined swirling flow (1985)
    Springer
    Experiments in fluids 3 (1985), S. 231-238 
    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 Density effects on isothermal jet mixing in confined swirling flow are investigated. The experiment is carried out with helium/air as the jet fluid in the same facility as that used by So et al. (1984a, b) and the test conditions are chosen to be the same as before. Contrary to the homogeneous mixing results, the helium jet is preserved up to 40 jet diameters downstream. The behavior of the mean and turbulence field depends highly on the initial jet velocity. Since the jets are fully turbulent and the jet momentum fluxes for inhomogeneous mixing are less than those for homogeneous mixing, the cause of this difference in behavior is directly attributed to the combined action of density difference and swirl. In spite of this, near isotropy of the turbulence field is again observed at ∼ 40 jet diameters downstream.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265106
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  • 7
    Electronic Resource
    Electronic Resource
    Helium jets discharging normally into a swirling air flow (1987)
    Springer
    Experiments in fluids 5 (1987), S. 255-262 
    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 characteristics of helium jets injected normally to a swirling air flow are investigated experimentally using laser Doppler and hot-wire anemometers. Two jets with jet-to-crossflow momentum flux ratios of 0.28 and 12.6 are examined. The jets follow a spiral path similar to that found in the swirling air flow alone. Swirl acts to decrease jet penetration, but this is being counteracted by the lighter jet fluid density which is being pressed towards the tube center by the inward pressure gradient. Consequently, in spite of the large variation in momentum flux ratio, jet penetration into the main flow for the two jets investigated is about the same. The presence of the jet is felt only along the spiral path and none at all outside this region. Upstream of the jet, the oncoming swirling flow is essentially unaffected. These characteristics are quite different from jets discharging into a uniform crossflow at about the same momentum flux ratios, and can be attributed to the combined effects of swirl and density difference between the jet fluid and the air stream. Finally, the jets lose their identity in about fifteen jet diameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279739
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  • 8
    Electronic Resource
    Electronic Resource
    Reduction of incubation time in citric acid fermentation by vermiculite (1966)
    Springer
    Cellular and molecular life sciences 22 (1966), S. 806-808 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung In Gegenwart des exfolierten Tonminerals Vermikulit wird die Zitronensäurebildung durchAspergillus niger besonders stimuliert. Dabei wird die Induktionsphase verkürzt sowie die gesamte Gärgeschwindigkeit im messbaren Bereich der Zitronensäurebildungsphase erhöht. Die Stimulierung scheint einzig auf verbesserten Haushalt der Spurenelemente zurückzuführen zu sein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01897428
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  • 9
    Electronic Resource
    Electronic Resource
    A transformation method of generating exact analytic solutions of the Schrödinger equation (1997)
    Springer
    International journal of theoretical physics 36 (1997), S. 1893-1905 
    Details
    ISSN: 1572-9575
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A transformation method is presented which consists of a coordinate transformation and a functional transformation that allow generation of normalized exact analytic bound-state solutions of the Schrödinger equation, starting from an analytically solved quantum problem. The coordinate transformation is the basic transformation, which is supplemented by the functional transformation so that one can choose the dimension of the space of the transformed system. By repeated application of the method, it is possible to generate a number of solved quantum problems in the case that the original quantum system has a multiterm potential. It is shown that the eigenfunction of the transformed system can be easily normalized in most cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02435851
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  • 10
    Electronic Resource
    Electronic Resource
    Composition and stability constants of iron- and copper-oxytetracycline chelates (1984)
    Springer
    Microchimica acta 84 (1984), S. 165-175 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Spektrophotometrische Methoden und pH-Messung ermöglichten die Bestimmung der im Titel angeführten Größen. Die Stabilitätskonstanten für die Eisen- bzw. Kupfer-Chelate sind: log/gb1 9,79; logβ 2 7,08; logβ 3 5,92; bzw. logβ 1 7,28; logβ 2 5,59. Die thermodynamischen Parameter dieser Reaktionen und die Art der Chelatbildung des Oxytetracyklin-Moleküls wurden ebenfalls untersucht. Die Reaktion mit Eisen(III) wurde für die Bestimmung von Oxytetracyklin verwendet. Ergebnisse mit einem Variationskoeffizienten 1,6% und einer mittleren Wiederfindungsrate von 98,6% wurden erzielt.
    Notes: Summary The composition and stability constants of iron and copper oxytetracycline chelates are determined by spectrophotometric and pH-metric methods. The stepwise stability constants are logβ 1 9.79, logβ 2 7.08, logβ 3 5.92 and logβ 1 7.28 and logβ 2 5.29 for iron and copper chelates, respectively. The thermodynamic parameters of these reactions and the site of chelation in oxytetracycline are also investigated. The reaction of iron(III) has been used for the spectrophotometric determination of oxytetracycline in some pharmaceutical preparations. Results with a coefficient of variation in the range of 1.6% and a mean recovery of 98.6% are obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01212382
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