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  • 1
    Electronic Resource
    Electronic Resource
    Wave flow of rivulets on the outer surface of an inclined cylinder (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 3288-3299 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper we present the results of an experimental study of wavy rivulet flow along the lower side of an inclined cylinder. The influence of the inclination angle of the cylinder, mode of irrigation and flow rate on the hydrodynamical characteristics is investigated. It is shown that the rivulet flow is unstable. As a consequence the nonlinear waves appear on a rivulet surface. The different types of surface waves are described. For the purpose of a detailed study of the wave characteristics, a method of superimposed oscillations is applied. New regularities of wave motion were found in comparison to the case of liquid film flow. The critical conditions for liquid ejection from the rivulet are determined. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869118
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  • 2
    Electronic Resource
    Electronic Resource
    Electrodiffusion diagnostics of wall shear stresses in impinging jets (1994)
    Springer
    Journal of applied electrochemistry 24 (1994), S. 626-631 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The electrodiffusion method of flow diagnostics was applied to the measurement of the wall shear stresses and turbulent characteristics in the vicinity of the stagnation point in impinging jets. The wall shear stress vector was determined by a double electrochemical probe consisting of two electrodes separated by a thin insulation gap. The impingement of an axisymmetric jet on a flat plate at normal incidence and the reattachment of the plane jet to an adjacent solid surface due to the Coanda effect were studied. The influence of injection and suction on the two-dimensional jet reattachment is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00252087
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Suppression of large-scale structures in a gas-saturated impact jet (1999)
    Springer
    Technical physics letters 25 (1999), S. 374-376 
    Details
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The suppression of large-scale vortex formations under gas-saturation conditions is detected on the basis of measurements of the pulsation component of the surface friction when an axisymmetric hot jet of a fluid impinges on an obstacle. The conditions for the resonant enhancement of coherent structures and the suppression of broad-band turbulence are determined for single-phase and gas-saturated impact jets. The evolution of various pulsation components in the gradient region of an impact jet is analyzed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1262487
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  • 4
    Electronic Resource
    Electronic Resource
    Traveling vortex breakdown (1997)
    Springer
    Technical physics letters 23 (1997), S. 868-869 
    Details
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new type of propagating perturbations on a vortex filament-traveling vortex breakdown-has been observed experimentally. A method of controlled external action on a vortex flow with known parameters is used. Data are obtained on the absolute propagation velocity of the perturbations as a function of the conditions in the vortex chamber, which determine the vortex characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1261914
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  • 5
    Electronic Resource
    Electronic Resource
    Spiral waves in dispersive media (1994)
    Springer
    Acta mechanica 105 (1994), S. 143-160 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The Lighthill kinematic approach is applied for the description of standing waves generated at circular motion of a point source in a dispersive medium. A single nonlinear ordinary differential equation is derived. Numerical calculations are performed for different dispersion relations. The spiral shape of waves and the existence of special points for wave crests are the main peculiarities of solutions obtained. A possible application of the kinematic approach to the description of spiral galaxies and other physical phenomena is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01183948
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Reattachment of a plane turbulent jet to a wall upon injection and suction (1997)
    Springer
    Journal of applied mechanics and technical physics 38 (1997), S. 417-422 
    Details
    ISSN: 1573-8620
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467843
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  • 7
    Electronic Resource
    Electronic Resource
    Rivulet flow of liquid on the outer surface of an inclined cylinder (1997)
    Springer
    Journal of applied mechanics and technical physics 38 (1997), S. 649-653 
    Details
    ISSN: 1573-8620
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02468110
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  • 8
    Electronic Resource
    Electronic Resource
    Asymmetry of the internal connections of the striate cortex of the cat in the projection zone of the center of the field of vision (1998)
    Springer
    Neuroscience and behavioral physiology 28 (1998), S. 211-217 
    Details
    ISSN: 1573-899X
    Keywords: Cat ; striate cortex ; internal connections ; horseradish peroxidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Studies were carried out on the organization of the internal connections of the striate cortex in cats in the projection zone of the center (0–5°) of the field of vision by microintophoretic application of horseradish peroxidase to electrophysiologically identified orientational columns. The area containing neurons showing retrograde labeling in most cases extended in the mediolateral direction. Labeled cells were located in the upper (II, III) and lower (V, VI) layers of the cortex, and the shapes and orientations of the areas containing labeled neurons in these layers coincided. Spatial asymmetry was detected in the distribution of labeled neurons relative to the orientational column studied. Labeled cells were located predominantly medial to the columns, regardless of the distance from the projection of the area centralis. Considering the visuotopical map of field 17, the asymmetry detected here provides evidence that neurons in orientational columns have more extensive connections with neurons of the peripheral part of the cortex. An asymmetrical distribution of “silent” zones around the receptive fields of neurons in orientational columns is suggested, and that these appear to receive influences from the periphery of the visual field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02461970
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  • 9
    Electronic Resource
    Electronic Resource
    Assessment of contrast sensitivity in kittens after the critical developmental period (1998)
    Springer
    Neuroscience and behavioral physiology 28 (1998), S. 198-200 
    Details
    ISSN: 1573-899X
    Keywords: Development ; kitten ; contrast sensitivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Spatial contrast sensitivity was measured in kittens aged 6, 9, and 12 months and in adult cats. Cats had to open one of two small windows, which had a photograph of a grid, in order to obtain food reinforcement. The nonreinforced stimulus was a photograph of a uniform field of the same mean luminance. Visual acuity was constant in kittens aged 6 to 12 months. However, six-month-old kittens had low contrast sensitivity at low spatial frequencies (〈0.6 cycles/degree). At the age of nine months, contrast sensitivity over this range increased, though the level seen in adult cats was reached only at the age of 12 months. It is suggested that the increase in contrast sensitivity occurring after the critical developmental period in kittens reflects maturation of higher-order cortical fields involved in the process of recognition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02461967
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  • 10
    Electronic Resource
    Electronic Resource
    Mechanism of directional selectivity of neurons with complex receptive fields in the cat visual cortex (1984)
    Springer
    Neurophysiology 16 (1984), S. 401-407 
    Details
    ISSN: 1573-9007
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Spatio-temporal interactions within complex receptive fields in the cat visual cortex were investigated by sequential presentation of two stationary stimuli. When two stimuli were presented in phase (on-on or off-off) in the order corresponding to preferred direction of movement, facilitation or weak inhibition of the response to the second stimulus was observed, whereas if it corresponded to zero direction of movement, the response was strongly inhibited. In the case of stimulation out of phase (on-off or off-on), in the order corresponding to the preferred direction of movement, considerable inhibition of the response to the second stimulus was observed, whereas in the opposite order, facilitation or weak inhibition was observed. The strength of interaction between different parts of the field depended on the distance between them and the duration of the interval between stimuli. Directional selectivity of "complex" neurons is thus ensured by asymmetry of spatio-temporal interactions between receptive field inputs of the same type. Interactions between inputs of different types, arising when a multiedge stimulus (bar, grating) can be used by the visual system to distinguish an object from the background and to assess changes in size of objects and the relative velocity of their movement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01053496
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