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  • Springer  (18)
  • Wiley-Blackwell  (18)
  • American Geophysical Union  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of tribromo(pyridine-N-oxide)thallium(III) (1991)
    Springer
    Journal of chemical crystallography 21 (1991), S. 93-96 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01158982
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  • 2
    Electronic Resource
    Electronic Resource
    Die Erdbeben im nördlichen Schwarzwald am 30. Dezember 1935 (1936)
    Springer
    International journal of earth sciences 27 (1936), S. 207-209 
    Details
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01804836
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  • 3
    Electronic Resource
    Electronic Resource
    A pulsed light generator for high speed photography (1987)
    Springer
    Experiments in fluids 5 (1987), S. 141-144 
    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 pulsed light generator for stroboscopic photography which makes use of LED's has been developed. The maximum light power which may be extracted from a single LED is approximately 1 Watt. The pulse repetition rate ranges up to 1 MHz and the length of the pulses is adjustable between 0.05 and 1 μs. The light emitted from the diodes is especially suited for the observation of phase objects by interferometric methods due to its pronounced coherence. Results of the electrical and optical performance of the generator are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00776185
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  • 4
    Electronic Resource
    Electronic Resource
    Computer-aided discrimination of slow and fast tracer paths (1992)
    Springer
    Experiments in fluids 13 (1992), S. 239-248 
    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 An optical method for the discrimination between slow and fast tracer particles convected within a flow is proposed. It is based on the dependence of the brightness of a trace on the velocity of the corresponding tracer. The images of the traces are captured by a CCD-camera and processed on-line. A practical application of this technique to the visualization of the low velocity streamlines in a rotating duct is presented. The possibilities to develop this technique into a quantitative tool for velocity measurements is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00189016
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  • 5
    Electronic Resource
    Electronic Resource
    An experimental study of the lateral migration of a droplet in a creeping flow (1986)
    Springer
    Experiments in fluids 5 (1986), S. 43-48 
    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 distribution of droplets in a plane Hagen-Poiseuille flow of dilute suspensions has been measured by a special LDA technique. This method assumes a well defined relation between the velocity of the droplets and their lateral position in the channel. The measurements have shown that the droplet distribution is non-uniform and depends on the viscosity ratio between the droplets and the carrier liquid. The results have been compared with a theory by Chan and Leal describing the lateral migration of suspended droplets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00272424
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  • 6
    Electronic Resource
    Electronic Resource
    Measurement of dynamic surface tension by the oscillating droplet method (1993)
    Springer
    Experiments in fluids 15 (1993), S. 332-340 
    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 An optical measuring method has been applied to determine the dynamic surface tension of aqueous solutions of heptanol. The method uses the frequency of an oscillating liquid droplet as an indicator of the surface tension of the liquid. Droplets with diameters in the range between 100 and 200 μm are produced by the controlled break-up of a liquid jet. The temporal development of the dynamic surface tension of heptanol-water solutions is interpreted by a diffusion controlled adsorption mechanism, based on the “three-layer” model of Ward and Tordai. Measured values of the surface tension of bi-distilled water, and the pure dynamic and static (asymptotic) surface tensions of the surfactant solutions are in very good agreement with values obtained by classical methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223411
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  • 7
    Electronic Resource
    Electronic Resource
    Die Erdbebentätigkeit in Südwestdeutschland (1948)
    Springer
    Naturwissenschaften 35 (1948), S. 58-60 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626792
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  • 8
    Electronic Resource
    Electronic Resource
    Über die Funkenverzögerung (1924)
    Springer
    The European physical journal 23 (1924), S. 129-134 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Es werden die Bedingungen untersucht, unter denen sich an einer Funkenstrecke in reproduzierbarer Weise die Verzögerungszeit in Abhängigkeit von dem Überschuß der Spannung über die wahre Entladespannung aufnehmen läßt. Für vollkommen fettfreie Elektroden in weitgehend getrockneter Luft ist dies der Fall. Für zwei Drucke werden die entsprechenden Kurven mitgeteilt. Als ein weiteres bemerkenswertes Resultat ergibt sich, daß in ganz trockener Luft die Verzögerungszeit durch einen äußeren Ionisator nur sehr wenig vermindert wird.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01327581
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  • 9
    Electronic Resource
    Electronic Resource
    On the theory of the effective nuclear magnetic relaxation time T2e and its application to polymer melts (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 28 (1990), S. 1001-1014 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A general expression for the magnetization decay of a multipulse group is derived. This formula is applied to a three-component model of molecular motions in polymer melts. The influence of the several components on the magnetization decay is discussed. The relation of the effective nuclear magnetic relaxation time T2e to the Anderson-Weiss formula is also shown, and an analytical expression for the transverse relaxation in melts is derived. Finally T2e is compared with the relaxation time in the rotating frame T1ρ in the melt. The theoretical results for T2e are tested with measurements of frequency dependence in polyethylene melts.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1990.090280702
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  • 10
    Electronic Resource
    Electronic Resource
    Frequency and molecular-mass-dependent nonexponential proton NMR relaxation in polymer melts (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 931-942 
    Details
    ISSN: 0887-6266
    Keywords: nuclear magnetic resonance (NMR) relaxation in polymer melts ; relaxation of proton NMR processes in melts (theory) ; chain motions and NMR relaxation in melts ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A theoretical treatment of the nonexponential relaxation behavior of the different proton nuclear magnetic resonance (NMR) relaxation processes in polymer melts is presented. Formulas are derived for a three-component model given by two versions and a homogeneous distribution of correlation times. The theoretical results were tested with measurements of T1, T2e, and T2 as functions of frequency and molecular mass in linear fractionated polyethylene samples. While the T1 relaxation always yields exponential magnetization decays, the T2e and T2 measurements show biexponential relaxation behavior. From the calculations it was found that the correlation time of the local motion is independent of the molecular mass, whereas the correlation time of the slowest motional process increases with M2.8w for the three-component model and with M2.2w for the distribution of correlation times, respectively. © 1992 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1992.090300901
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