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  • International Union of Crystallography (IUCr)  (3)
  • Cambridge University Press  (2)
  • 1975-1979  (5)
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Publisher
Years
Year
  • 1
    facet.materialart.
    Unknown
    Former Ice Shelves in the Canadian High Arctic (1978)
    Cambridge University Press
    Details
    Publication Date: 1978-01-01
    Description: Moraines deposited by the outermost ice advance across Judge Daly Promontory, northeastern Ellesmere Island, reflect thin, topographically controlled ice lobes extending to sea-level. The termini of two ice lobes were investigated and both produced ice shelves where they flowed into isostatically depressed embayments along western Kennedy Channel. Morphological evidence for these ice shelves occurs at the entrance to these valleys where steeply descending lateral moraines become abruptly horizontal for 2 km. In addition, both the horizontal moraines and associated pro-glacial terraces are fossiliferous down-valley from the apparent grounding line. Based on the differences in elevation between the horizontal moraines and the valley bottoms, the two ice shelves had estimated thicknesses ofc. 110 and 150 m. A proglacial outwash terrace at 175 m a.s.l. is considered to represent the approximate relative sea-level during the formation and break-up of the ice shelves. This relative sea-level is consistent with the water depths required to float the calculated ice thicknesses in both valleys. Associated with these ice margins are finite14C dates of 28 000-30 000 B.P. and amino-acid age estimates of 〉35 000 B.P. The importance and likelihood of additional past ice shelves in the Canadian High Arctic is discussed.
    Print ISSN: 0022-1430
    Electronic ISSN: 1727-5652
    Topics: Geography , Geosciences
    Published by Cambridge University Press on behalf of International Glaciological Society.
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  • 2
    facet.materialart.
    Unknown
    Former Ice Shelves in the Canadian High Arctic (1978)
    Cambridge University Press
    Details
    Publication Date: 1978-01-01
    Description: Moraines deposited by the outermost ice advance across Judge Daly Promontory, northeastern Ellesmere Island, reflect thin, topographically controlled ice lobes extending to sea-level. The termini of two ice lobes were investigated and both produced ice shelves where they flowed into isostatically depressed embayments along western Kennedy Channel. Morphological evidence for these ice shelves occurs at the entrance to these valleys where steeply descending lateral moraines become abruptly horizontal for 2 km. In addition, both the horizontal moraines and associated pro-glacial terraces are fossiliferous down-valley from the apparent grounding line. Based on the differences in elevation between the horizontal moraines and the valley bottoms, the two ice shelves had estimated thicknesses of c. 110 and 150 m. A proglacial outwash terrace at 175 m a.s.l. is considered to represent the approximate relative sea-level during the formation and break-up of the ice shelves. This relative sea-level is consistent with the water depths required to float the calculated ice thicknesses in both valleys. Associated with these ice margins are finite 14C dates of 28 000-30 000 B.P. and amino-acid age estimates of 〉35 000 B.P. The importance and likelihood of additional past ice shelves in the Canadian High Arctic is discussed.
    Print ISSN: 0022-1430
    Electronic ISSN: 1727-5652
    Topics: Geography , Geosciences
    Published by Cambridge University Press on behalf of International Glaciological Society.
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    PAPER CURRENT
  • 3
    Electronic Resource
    Electronic Resource
    A phase transition in a 3D growth-disorder model (1978)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 34 (1978), S. 120-123 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: It is shown that a model of growth disorder, describing the way in which substitutional disorder can be introduced into binary solid solutions at growth, exhibits a phase transition. In a particular case it is shown that the distribution in 2D sections of the crystal corresponds to the simple pair-interaction Ising model on a triangular lattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739478000212
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A phase transition in a 3D growth-disorder model; erratum (1978)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 34 (1978), S. 1030-1030 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The following corrections should be made in Welberry & Miller [Acta Cryst. (1978). A34, 120-123]. 1. Equation (2) on p. 121 should read: E(σ) = - \sum_{{\rm all_{sites}}} σi,j,k [J(σi - 1, j, k + 1 + σ i,j + 1, k - 1 + σi + 1 j - 1, k) + K (σi - 1, j,k + σi,j - 1,k + σi,j,k - 1) + L(σi - 1, j,kσi,j - 1, kσi,j,k - 1)]. 2. The expression for J on p. 121 should be J = 1/8 In [a(1 - a)/b(1 - b)]. 3. In the second paragraph of the second column on p. 121 'J and - K' should be replaced by 'K and -J'. All information is given in the Abstract.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739478002132
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  • 5
    Electronic Resource
    Electronic Resource
    A three-dimensional model of crystal-growth disorder (1979)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 35 (1979), S. 391-400 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The relationship between nearest-neighbour growth-disorder models and Ising models is described in detail. The growth model with only two-body interactions is shown to be equivalent, in section perpendicular to the growth direction, to a simple Ising model. Two approximate solutions for the growth model are compared with exact solutions of equivalent Ising models, where possible, and also with computer realizations; the behaviour of these approximate solutions is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056773947900098X
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