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  • 1990-1994  (2)
  • 1960-1964
  • 1994  (2)
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  • 1990-1994  (2)
  • 1960-1964
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  • 1
    Electronic Resource
    Electronic Resource
    Exact conditional distribution of a three-phase invariant in space group P1. IV. Further improvements of Cochran-like approximations (1994)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 633-636 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A new approximate method of computing the conditional probability density function (c.p.d.f.) of a three-phase invariant is investigated, the results being compared to accurate calculations [Shmueli, Rabinovich & Weiss (1989). Acta Cryst. A45, 361–367]. A direct dependence on N, the number of atoms in the unit cell, is incorporated into the new approximation and its performance in the equal-atom case appears to be excellent over a large range of N values. The polynomial approximation of the recently published method [Posner, Shmueli & Weiss (1993). Acta Cryst. A49, 260–265] has been improved in both accuracy and range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767394002382
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of noncrystallographic symmetry on the Σ1 relationship. I. Bicentric arrangements in Pl (1994)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 605-608 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: An exact Fourier representation of the probability for the Σ1 relationship is derived, which takes into account the presence of noncrystallographic centrosymmetry in the asymmetic unit of the space group P{\bar 1}. Illustrative examples show that the main effect of noncrystallographic symmetry is to decrease the probability that E2h is positive, as compared to the corresponding probability in the absence of such symmetry. The effect appears to be more pronounced in the equal-atom case than it is for a structure having a heterogeneous atomic composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767394002400
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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