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  • Articles  (2)
  • Cambridge University Press  (2)
  • American Association for the Advancement of Science
  • Geological Society of America (GSA)
  • Institute of Physics
  • 1990-1994
  • 1975-1979  (2)
  • 1970-1974
  • 1930-1934
  • Economics  (1)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (1)
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  • Articles  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Cambridge : Cambridge University Press
    Journal of American studies 9 (1975), S. 189-197 
    ISSN: 0021-8758
    Source: Cambridge Journals Digital Archives
    Topics: English, American Studies , History , Political Science , Sociology , Economics
    Notes: While the question of geographic mobility has long been a mainstay of American historical writing and American myth-making – as evidenced by Turner and his disciples and the general obsession widi the frontier – until recently most historians have done little systematic investigation into it. Nor, indeed, have they been aware either of the enormous degree of movement within the country, or of the complex issues involved in determining why people have moved as they have. However, with the rise of what generally is termed the ‘ new urban ’ or ‘ new social ’ history, historians have begun to view migration as a question central to their analysis. Social scientists recognized the importance of migratory behaviour for many years and have employed sophisticated analytical techniques in their efforts to explain migration patterns, but recently historians approached the problem from another direction.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 1975-12-01
    Description: Measurements of velocity fluctuations u (axial) and v (radial) and temperature fluctuations θ averaged over the turbulent zone have been made in a turbulent heated jet with a co-flowing stream and compared with the conventionally averaged results. The zone-averaged mean temperature and temperature fluctuation intensity appear to be nearly homogeneously distributed in the outer, intermittent region of the jet. This homogeneity does not apply to the u and v fluctuations. The flatness factor of the temperature within the turbulent part of the flow is remarkably constant throughout the intermittent region. Although the skewness of the turbulent θ fluctuations is non-zero, it is smaller than the skewness of the turbulent u and v fluctuations. The average [Formula ommited] of the heat flux over the turbulent zone increases in the intermittent region whereas the zone-averaged momentum flux [Formula ommited] and zone-averaged heat flux [Formula ommited] continuously decrease. This leads to the Prandtl number of the turbulent fluid being smaller than the conventional Prandtl number in the outer part of the flow. A budget for the square of the temperature fluctuations within the turbulent part of the flow indicates a constant distribution of temperature dissipation. The transport of heat by the large-scale structure of the flow is briefly discussed in the light of available experimental information on other turbulent shear flows. © 1975, 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
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