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  • Electronic Resource  (3)
  • 1985-1989  (3)
  • 1989  (2)
  • 1985  (1)
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  • Electronic Resource  (3)
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  • 1985-1989  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Piston-driven, unsteady separation at a sudden expansion in a tube: Flow visualization and LDA measurements (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1249-1260 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Flow visualization studies and laser-Doppler anemometry (LDA) measurements have been performed on the flow field generated at a sudden expansion in a cylindrical pipe during the intake stroke of a piston. The range of piston Reynolds numbers investigated, based on piston diameter and velocity, was 18–125 and covered a laminar and a transition-to-turbulence regime. A detailed study of the parameters influencing the structure of the flow, i.e., the clearance volume and the piston velocity, was carried out and is presented, and the mechanism for the creation of flow instabilities at low Reynolds numbers is outlined. One of the striking features of the flow relates to the formation of vortex structures during the intake flow. It is found that under some circumstances these structures become unstable, despite the relatively low Reynolds number of the flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857348
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of mixed function oxidase inhibitors on the toxicity of chlortoluron and isoproturon to wheat (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 25 (1985), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Growth responses of wheat plants to combined treatments of four mixed function oxidase (MFO) inhibitors and chlortoluron were determined. Analysis of interactions showed that piperonyl-butoxide and especially ABT (1-aminobenzotriazole) increased the toxicity of chlortoluron. Metyrapone and 2,4-dichlorophenoxypropyne were phytotoxic and did not exert any clear interaction. ABT also increased the toxicity of isoproturon to wheat.Our results suggest that ABT Strongly inhibits the breakdown of chlortoluron and isoproturon in wheat. Since ABT is known to act as a suicide substrate for plant cytochrome P-450, wheat enzymes involved in the metabolism of these two herbicides are likely to belong to this class. It thus appears that compounds designed to inhibit plant cytochrome P-450 enzymes may interact with herbicide metabolism and are potential synergists of herbicide activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1985.tb00661.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Measurement of the shear viscosity using a newly developed GRLDA-viscometer (1989)
    Springer
    Rheologica acta 28 (1989), S. 473-481 
    Details
    ISSN: 1435-1528
    Keywords: Shearviscosity ; gradient laser Doppler anemometry ; polymersolutions ; surfactant solutions ; structuralturbulence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract A two-point laser-Doppler anemometer is used to determine velocity gradients. Measuring additionally the pressure drop in channel flow allows one to use this instrument as a viscometer. This is demonstrated by measuring two polymer solutions as well as water. Besides the velocity gradient, the system also furnishes the velocity as well as velocity fluctuations. For surfactant solutions the sudden increase in these fluctuations go hand-in-hand with the sudden shear thickening reported. This behavior thus seems to be caused by a change in type of flow field (structural turbulence) rather than a change in the rheology of the surfactant solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01332918
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    Paper (German National Licenses)
    Fulltext
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