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  • 1995-1999  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Capillary instabilities in solid thin films: Lines (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 7604-7611 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The linear morphological instability of a line of film on a substrate has been examined for contact angles between 0 and π. The base state of the line is an infinitely long cylinder with cross-sectional shape a segment of a circle. We assume that mass flows by diffusion along the film surface and that local equilibrium holds. We find that for non-zero contact angles there is a finite range of perturbation wavenumbers in the axial direction which correspond to instability and will potentially lead to agglomeration of the line of film. All unstable perturbations are of the varicose (sausage) type. The presence of the substrate is stabilizing; the range of unstable wavelengths is always less than that of a freely-suspended circular cylinder with the same volume and decreases to zero width at zero contact angle. The maximum growth rate of the instability varies strongly with the contact angle and approaches zero as the contact angle approaches zero. Our results agree qualitatively with the experimentally observed wavelength and growth rates of the instability. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362343
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal singularities in film rupture (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 3433-3435 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Long-wave approximation for the spatiotemporal evolution of thermal and evaporative instabilities of a thin liquid film lying on a "thick'' solid substrate is considered. It is shown that accounting for a nonzero thermal resistance of the solid eliminates the emergence of temperature, heat and mass flux singularities at the rupture point. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869127
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The Politics of Principal Evaluation (1999)
    Springer
    Journal of personnel evaluation in education 13 (1999), S. 383-403 
    Details
    ISSN: 1573-0425
    Source: Springer Online Journal Archives 1860-2000
    Topics: Education
    Notes: Abstract This article examines the politics of principal evaluation through both an extensive review of the literature and in-depth interviews with principals and superintendents. The findings reveal that the format and processes used in principal evaluation often vary from one district to another and that principals and superintendents frequently hold different perspectives about the purposes and usefulness of evaluation. Most principals felt their evaluations were not useful and were unduly influenced by political forces beyond their control. Superintendents believed that evaluations were well developed and useful in assessing principal competence. Principals should take an active role in the development and implementation of evaluation processes, while superintendents need to clearly communicate evaluation processes, purposes, and sources of information.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008161417522
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    Paper (German National Licenses)
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