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  • 1
    Electronic Resource
    Electronic Resource
    Laplace pressure driven drop spreading (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 24-33 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This work concerns the spreading of viscous droplets on a smooth rigid horizontal surface, under the condition of complete wetting (spreading parameter S(approximately-greater-than)0) with the Laplace pressure as the dominant force. Owing to the self-similar character foreseeable for this flow, a self-similar solution is built up by numerical integration from the center of symmetry to the front position to be determined, defined as the point where the free-surface slope becomes zero. Mass and energy conservation are invoked as the only further conditions to determine the flow. The resulting fluid thickness at the front is a small but finite (≈10−7) fraction of the height at the center. By comparison with experimental results the regime is determined in which the spreading can be described by this solution with good accuracy. Moreover, even within this regime, small but systematic deviations from the predictions of the theory were observed, showing the need to add terms modifying the Laplace pressure force.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868072
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  • 2
    Electronic Resource
    Electronic Resource
    Pattern formation in the flow of thin films down an incline: Constant flux configuration (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 13 (2001), S. 3168-3184 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present fully nonlinear time-dependent simulations of a thin liquid film flowing down an inclined plane. Within the lubrication approximation, and assuming complete wetting, we find that varying the inclination angle considerably modifies the shape of the emerging patterns: Finger-shaped patterns result for the flow down a vertical plane, while saw-tooth patterns develop for the flows down an inclined plane. However, in all of our simulations, the roots always move, indicating that the shape of the patterns is not necessarily related to the surface coverage, a technologically important feature of the flow. Furthermore, we find that triangular steady-state patterns may be produced for the flow down an incline, while the fingers typically grow in length for all explored times. We find quantitative agreement with reported experiments, and suggest new ones. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1409965
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  • 3
    Electronic Resource
    Electronic Resource
    Free expansion of a gas against a rigid wall (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 285-288 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The flow behind the shock wave produced when a freely expanding gas strikes a rigid wall is studied. The shock speed is known within an early stage after the shock onset, when the flow is self-similar and, also, as is pointed out, when the shock decays into a sonic disturbance, propagating in an almost uniform gas. On this basis, an approximate differential equation can be written for the shock position, whose solution is analytic, and therefore, the flow magnitudes are given by simple relationships. Comparison with numerical simulations shows that the flow is well described by this approximation. This work also includes a brief review of the equations for the self-similar regime, because corrections to previously published results were found necessary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857444
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  • 4
    Electronic Resource
    Electronic Resource
    A numerical study on the transition to self-similar flow in collapsing cavities (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 676-679 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the collapse of a spherical cavity surrounded by a perfect gas initially at rest, the velocity R(overdot) of the free gas boundary has an initial valve of −2c0/(γ−1) (c0 is the speed of sound in the undisturbed gas and γ is the adiabatic exponent). Hereafter R(overdot) remains practically constant until R becomes a certain fraction ξ(γ) of the initial radius R0. Finally, for R〈ξR0, R(overdot) approaches the asymptotic behavior R(overdot)∼R−τ(γ) predicted by self-similar solutions. The function ξ(γ), which has been obtained numerically, decreases as γ decreases and vanishes for a certain value of γ near 1.5. This fact, together with the analogous behavior of τ(γ), suggests that there exists a certain value γcr≈1.5 of the adiabatic exponent such that, for 1〈γ〈γcr the velocity R(overdot) of the free boundary is strictly a constant during the entire collapse. This behavior seems to be closely related to the results obtained by Lazarus [Phys. Fluids 25, 1146 (1982)] who demonstrates that a degenerate stable, asymptotic solution, with R(overdot)=const, exists for γ〈3/2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865917
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  • 5
    Electronic Resource
    Electronic Resource
    Instantaneous viscous flow in a corner bounded by free surfaces (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 2269-2274 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We study the instantaneous Stokes flow near the apex of a corner of angle 2α formed by two plane stress free surfaces. The fluid is under the action of gravity with g↘ parallel to the bisecting plane, and surface tension is neglected. For 2α(approximately-greater-than)126.28°, the dominant term of the solution as the distance r to the apex tends to zero does not depend on gravity and has the character of a self-similar solution of the second kind; the exponent of r cannot be obtained on dimensional grounds and the scale of the coefficient depends on the far flow field. Within this angular domain, the instantaneous flow is deeply related to the (steady) flow in a rigid corner known since Moffatt [J. Fluid Mech. 18, 1 (1964)] and, as in that case, there may be eddies in the flow. The situation is substantially different for 2α〈126.28°, as the dominant term is related to gravity and not to the far flow. It has the character of a self-similar solution of the first kind, with the exponent of r being given by dimensional analysis. The solution cannot be continued in time since it leads to the curling of the boundaries. Nevertheless, it provides information on how such a cornered contour may evolve. When 2α〈180°, the corner angle does not vary as the flow develops; on the other hand, if 2α(approximately-greater-than)180° the corner must round or tend to a narrow cusp, depending on the far flow. These predictions are supported by simple experiments. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869042
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  • 6
    Electronic Resource
    Electronic Resource
    Acceleration of a slab driven by a constant pressure piston (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1426-1429 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The sequence of shock and rarefaction waves, which occur in a plane layer of ideal gas initially at rest when it is driven toward the vacuum by a very high constant pressure piston, is studied. In the rarefaction flow that relaxes the layer compressed by the first strong shock, a second shock is generated. The time and position of its formation are obtained by an exact analytical expression. The subsequent motion and intensity of the shock wave are approximated by the Chester–Chisnell–Whitham (CCW) method. Then, the Lagrangian distribution of entropy in the layer is analytically derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857320
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  • 7
    Electronic Resource
    Electronic Resource
    Genetic characterization of Gremmeniella abietina var. abietina isolates from Spain (2005)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 54 (2005), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The taxonomic placement of Spanish isolates of Gremmeniella abietina var. abietina (Gaa) (race and biotype) was determined, for the first time, using RAPD markers and comparison of RAPD patterns for Spanish isolates and those originating from different regions of Europe and North America. Fifteen Spanish isolates of Gaa were isolated from recently dead shoots of 10 Pinus halepensis trees. Additionally, 17 isolates of Gaa from Canada, Finland, Switzerland and the USA, previously characterized according to race and biotype, were used. Five primers, previously reported to yield readable, reproducible and polymorphic fragments, were used in PCR reactions. The results showed that the Spanish isolates represent the European race and not the Alpine or northern biotypes. Spanish isolates appear to be clearly separated from all other biotypes within the EU race and preliminary data suggest that Spanish isolates have low genetic variability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.2005.01184.x
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  • 8
    Electronic Resource
    Electronic Resource
    Occurrence of Pestalotia stevensonii on Pinus pinea in Spain (2004)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 53 (2004), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0032-0862.2004.00978.x
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of Ophiostoma ulmi and Ophiostoma novo-ulmi culture filtrates on elm cultures from genotypes with different susceptibility to Dutch elm disease (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Forest pathology 28 (1998), S. 0 
    Details
    ISSN: 1439-0329
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Cell cultures of callus tissue cultures obtained from four elm genotypes (Ulmus minor; Ulmus minor×Ulmus pumila; [Ulmus carpinifolia×Ulmus glabra] × [Ulmus wallichiana×Ulmus glabra]; and Ulmus pumila), either susceptible or resistant to Dutch elm disease (DED) were exposed to culture filtrates of Ophiostoma ulmi and Ophiostoma novo-ulmi. Elm cells were largely affected by crude culture filtrate incorporated into the media. However, the correlation between ‘in vivo’ cell resistance and growth in the presence of culture filtrate was poor: the effects of fungal media components were greater than that exerted by fungal exotoxins. Therefore, it is concluded that these ‘in vitro’ assays cannot be used to evaluate resistance sources to DED in elms, or to assess specific pathogenicity of fungal isolates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0329.1998.tb01194.x
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  • 10
    Electronic Resource
    Electronic Resource
    Clinical manifestations of allergy to Anisakis simplex (2000)
    Copenhagen : Munksgaard International Publishers
    Allergy 55 (2000), S. 0 
    Details
    ISSN: 1398-9995
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1398-9995.2000.03405.x
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