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  • 1
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    The oblique ascent of a viscous vortex pair toward a free surface (1992)
    Cambridge University Press
    Details
    Publication Date: 1992-03-01
    Description: The problem of a vortex pair, rising obliquely at an angle of 45° toward a deformable free surface in a viscous, incompressible fluid, is solved with the aid of the Navier-Stokes equations. The full nonlinear boundary conditions at the free surface are applied. The oblique interaction of the vortex pair with the free surface results in a number of novel features that have not been observed for the special case of a vertical rise, reported earlier. These features include the directional change of trajectories near the free surface and the occurrence of waves driven by the vortex pair. Moreover, surface tension can completely change the flow characteristics such as the direction of the trajectories and the generation of secondary vortices. Numerical solutions are presented for selected Reynolds, Froude, and Weber numbers. © 1992, Cambridge University Press. All rights reserved.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Cambridge University Press
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  • 2
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    Interaction of a viscous vortex pair with a free surface (1991)
    Cambridge University Press
    Details
    Publication Date: 1991-06-01
    Description: A vortex pair in a viscous, incompressible fluid rises vertically toward a deformable free surface. The mathematical description of this flow situation is a time-dependent nonlinear free-surface problem that has been solved numerically for a two-dimensional laminar flow with the aid of the Navier-Stokes equations by using boundary-fitted coordinates. For a number of selected flow parameters, results are presented on the decay of the primary vortices and their paths, the generation of surface vorticity and secondary vortices, the development and final stage of the disturbed free surface, and the influence of surface tension. High and low Froude numbers represent the two extremes of free-surface yielding and stiffness, respectively. For an intermediate Froude number, a special rebounding due to the presence of secondary vortices has been observed: the path of the primary vortex centre portrays a complete loop. © 1991, Cambridge University Press. All rights reserved.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Cambridge University Press
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    PAPER CURRENT
  • 3
    Electronic Resource
    Electronic Resource
    The Roots of America's China Policy (1962)
    Cambridge : Cambridge University Press
    The @China quarterly 10 (1962), S. 45-50 
    Details
    ISSN: 0305-7410
    Source: Cambridge Journals Digital Archives
    Topics: Linguistics and Literary Studies , History , Political Science , Sociology , Economics
    Notes: In order to understand the policy of the United States towards China it is necessary to go back to die Chinese civil war. It is at this point that the confusion over ‘the real issue obscured the thinking and frustrated the policies of the United States. When it became obvious that the Nationalist régime was unable to cope with the revolutionary situation even if supported by American arms and advice, only two courses, which General Wedemeyer's report of 1947 clearly envisaged, were logically open to American policy. One was military intervention on such a scale as to be sufficient not only to crush the Communist armies but also to keep discontent permanently in check. Military intervention of this kind would have entailed military and political commitments of incalculable magnitude. This course of action was rejected by the framers of the United States' foreign policy on the advice, among others, of the then-Secretary of State, George Marshall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0305741000002745
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