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  • 1
    Electronic Resource
    Electronic Resource
    Emma Marshall and Longfellow: Some Additions to Hilen's Letters (1974)
    Cambridge : Cambridge University Press
    Journal of American studies 8 (1974), S. 81-90 
    Details
    ISSN: 0021-8758
    Source: Cambridge Journals Digital Archives
    Topics: English, American Studies , History , Political Science , Sociology , Economics
    Notes: In the Introduction to the first volume of The Letters of Henry Wadsworth Longfellow (Cambridge, Mass., Belknap Press, 1966– ), Andrew Hilen recognizes that his edition can make no claim to completeness: there are still likely to come to light some of the early letters known to have been written but which he has been unable to trace. Though he considers it improbable that the rinding of lost correspondence will necessitate any fundamental reassessment of the poet's character or of his literary work, Hilen thinks it ‘nevertheless obvious that many of these unrecovered letters contained information that would interest both Longfellow's biographer and the critic of his poetry’ (pp. 4–5). These comments are perfectly applicable to the letters from Longfellow to Mrs Emma Marshall, nee Martin, which are to be found in Beatrice Marshall's memorial of her mother, Emma Marshall, a biographical sketch (London, Seeley & Co., 1900).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0021875800013761
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Evenson, Norma: Two Brazilian Capitals: Architecture and Urbanism in Rio de Janeiro and Brasília : New Haven and London, Yale University Press, 1973 (1976)
    Cambridge : Cambridge University Press
    Urban history 3 (1976), S. 92-94 
    Details
    ISSN: 0963-9268
    Source: Cambridge Journals Digital Archives
    Topics: Architecture, Civil Engineering, Surveying , History , Sociology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0963926800002182
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  • 3
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    Experimental study on low-speed streaks in a turbulent boundary layer at low Reynolds number (2020)
    Cambridge University Press
    Details
    Publication Date: 2020-09-18
    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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  • 4
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    Quantitative characteristics of a laminar, unsteady necklace vortex system at a rectangular block-flat plate juncture (1995)
    Cambridge University Press
    Details
    Publication Date: 1995-03-10
    Description: The unsteady laminar necklace vortex system formed at the junction of a rectangular bluff body and a flat plate was studied experimentally using hydrogen bubble flow visualization and particle image velocimetry (PIV). The vortex system was found to exhibit unsteady behaviour similar to that described by other investigators for cylinder-flat plate junctures, and is characterized by the periodic formation of necklace vortices upstream of the body that subsequently break away and advect towards the block. Detailed analysis of PIV measurements on the plane of symmetry indicates that the dominant mechanism for vorticity balance in the vortex system is the cross-cancellation of the vorticity of the necklace vortex with vorticity of opposite sign generated by interaction of the necklace vortex with the approach surface to the body. © 1995, 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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  • 5
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    Visualization of a mechanism for three-dimensional interaction and near-wall eruption (1999)
    Cambridge University Press
    Details
    Publication Date: 1999-09-10
    Description: An experimental configuration has been found which allows detailed observation of three-dimensional vortex-vortex and associated vortex-surface interactions which appear similar to those observed in fully turbulent flow. Hydrogen bubble visualization illustrates a complicated intertwining, or braiding, of two initially co-rotating vortices. It is observed that the three-dimensional interactions of the braided vortices induces a pair of local surface-fluid eruptions reminiscent of the 'bursting' behaviour characteristic of the near-wall regeneration process of fully turbulent boundary layers.
    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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  • 6
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    A study of hairpin vortices in a laminar boundary layer. Part 1. Hairpin vortices generated by a hemisphere protuberance (1987)
    Cambridge University Press
    Details
    Publication Date: 1987-02-01
    Description: It has been suggested that hairpin vortices may play a key role in developing and sustaining the turbulence process in the near wall region of turbulent boundary layers. To examine this suggestion, a study was done of the hairpin vortices generated by the interaction of a hemisphere protubferancee within a developing laminar boundary layer. Under the proper conditions, hairpin vortices are shed extremely periodically, which allows detailed examination of their behaviour. Shedding characteristics of the hemispheres were determined using hot-film-anemometry techniques. The flow patterns created by the presence of the hairpin vortices have been documented using flow visualization and hot-film-anemometry techniques, and cross-compared with the patterns observed in the near-wall of a fully turbulent boundary layer. In general, it has been observed that many of the visual patterns observed in the near-wall region Of a turbulent boundary layer can also be observed in the wake of the hairpimsheddihg hemisphere, which appears supportive of the importance of hairpin vortices in the near-wall turbulence production process. Furthermore, velocity measurements indicate the presence of strong inflexional profiles just downstream of the hairpin-vortex generation region which evolve into fuller profiles with downstream distance, eventually developing a remarkable similarity to a turbulent-boundary-layer velocity profile. © 1987, 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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  • 7
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    Turbulent spot flow topology and mechanisms for surface heat transfer (2008)
    Cambridge University Press
    Details
    Publication Date: 2008-10-10
    Description: The properties of artificially initiated turbulent spots over a heated plate were investigated in a water channel. The instantaneous velocity field and surface Stanton number were simultaneously established using a technique that combines particle image velocimetry and thermochromic liquid crystal thermography. Several characteristics of a spot are found to be similar to those of a turbulent boundary layer. The spacing of the surface heat transfer streak patterns within the middle or 'body' of a turbulent spot are comparable to the low-speed streak spacing within a turbulent boundary layer. Additionally, the surface shear stress in the same region of a spot is also found to be comparable to a turbulent boundary layer. However, despite these similarities, the heat transfer within the spot body is found to be markedly less than the heat transfer for a turbulent boundary layer. In fact, the highest surface heat transfer occurs at the trailing or calmed region of a turbulent spot, regardless of maturity. Using a modified set of similarity coordinates, instantaneous two-dimensional streamlines suggest that turbulent spots entrain and subsequently recirculate warm surface fluid, thereby reducing the effective heat transfer within the majority of the spot. It is proposed that energetic vortices next to the wall, near the trailing edge of the spot body, are able to generate the highest surface heat transfer because they have the nearest access to cooler free-stream fluid. © 2008 Cambridge University Press.
    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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  • 8
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    The generation and regeneration of single hairpin vortices (1994)
    Cambridge University Press
    Details
    Publication Date: 1994-10-25
    Description: The generation and growth of single hairpin vortices created by controlled surface fluid injection were examined experimentally within a laminar boundary layer over a range of Reynolds numbers. Flow visualization, using both dye and hydrogen bubbles, was employed in conjunction with hot-film anemometry to investigate the growth characteristics and evolution of these single hairpin vortices. Hydrogen-bubble visualization results reveal that the passage of a hairpin vortex can give rise to a low-speed streak pattern adjacent to the surface, and a turbulent pocket-like pattern farther removed from the surface. When the displacement and injection Reynolds numbers exceed critical levels, regeneration processes occur, which result in the development of new hairpin-like vortices by both (i) lateral deformation of the vortex lines comprising the initial hairpin vortex and (ii) a process of vortex-surface interaction, which causes the ejection of surface fluid and subsequent hairpin formation by viscous-inviscid interactions. The combination of these processes results in both lateral and streamwise growth of the initial hairpin-vortex structure, yielding a symmetric turbulent-spot type of behaviour. © 1994, 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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  • 9
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    Radiation hazard to man and animals from fallout in the Arctic (1965)
    Cambridge University Press
    Details
    Publication Date: 1965-09-01
    Description: The radiation hazards to humans in certain northern regions, and to reindeer, caribou and moose, due to radioactive materials from fallout in their diets, have been discussed recently in numerous publications. The following factors make this problem of particular interest:i. The peculiarity of lichens to absorb and retain larger quantities of radioactive fallout than other plants. This peculiarity of lichens is exemplified by some measurements of Paakkiola and Miettinen made during 1960 and 1961. They found that the strontium-90 content of lichens in northern Finland varied between 350 and 4500 SU, whereas for grass and other plants from the same area the figures varied between 43 and 273 SU.
    Print ISSN: 0032-2474
    Electronic ISSN: 1475-3057
    Topics: Ethnic Sciences , Geography
    Published by Cambridge University Press
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  • 10
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    A study of hairpin vortices in a laminar boundary layer. Part 2. Hairpin vortices generated by fluid injection (1987)
    Cambridge University Press
    Details
    Publication Date: 1987-02-01
    Description: It has been suggested that hairpin vortices are a major sustaining flow structure involved in the perpetuation of turbulent boundary layers, although their origin within the boundary layer is unclear. One hypothesis is that hairpin structures are formed by the breakdown of the low-speed streak structures which develop adjacent to the surface beneath turbulent boundary layers. To examine this hypothesis, a water-channel study has been done which utilizes injection through surface slots in a flat plate to create artificial low-speed streak-type regions beneath a laminar boundary layer. Under appropriate conditions, these synthesized low-speed streaks develop a three-dimensional, shear-layer instability which breaks down to form a hairpin-vortex street. Employing both flow visualization and anemometry measurements, the characteristics of these hairpin structures and the parameters influencing their generation have been examined. The hairpin streets were determined to develop in a very periodic and repeatable manner within a definite range of flow parameters. Detailed flow patterns obtained using dye and hydrogen bubbles, both individually and collectively, indicate a remarkable similarity with previously observed patterns in the near-wall region of turbulent boundary layers. In addition, the development of the hairpin structures is observed to be quite sensitive to external forcing, as well as exhibiting a tendency for organized development of larger, more complex structures through a pairing-type process. Velocity measurements indicate the initial presence of strong inflexional profiles which evolve rapidly to velocity and turbulence-intensity profiles commensurate with those associated with turbulent boundary layers, but which do not exhibit the marked spreading associated with turbulence. © 1987, 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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