Acta Crystallographica Section A
Acta Crystallographica
Section A FOUNDATIONS AND ADVANCES

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FOUNDATIONS
ADVANCES

Volume 50| Part 4

ISSN: 2053-2733

July 1994 issue

Highlighted illustration

Cover illustration: A computer-simulated Fourier transform of the following object symbolizing a small bidimensional crystal: Courtesy of A. Soyer and M. Pilard.

lead articles

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The control of difficult refinements

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research papers

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Crystallography, geometry and physics in higher dimensions. XIII. Tri-incommensurate crystal phases

T. Phan and R. Veysseyre

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Crystallography, geometry and physics in higher dimensions. XIV. `Filiation' from one-, two- and three-dimensional crystal families and point groups to the mono-, di- and tri-incommensurate crystal families in four-, five- and six-dimensional spaces

D. Weigel and R. Veysseyre

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The centrosymmetric–noncentrosymmetric ambiguity: some more examples

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Strip-projection approach to a new model of the AlMnSi icosahedral quasicrystal

Y. F. Cheng and J. Gjønnes

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The temperature dependence of the reflection intensities of the modulated composite structure Hg_0.776(BEDT-TTF)SCN

M. R. Pressprich, C. van Beek and P. Coppens

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Patterson-oriented automatic structure determination. Deconvolution techniques in space group P1

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Dynamical diffraction in the Laue case with Borrmann absorption

T. Fukamachi, R. Negishi and T. Kawamura

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Dirac–Fock calculations of X-ray scattering factors and contributions to the mean inner potential for electron scattering

D. Rez, P. Rez and I. Grant

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Use of tilted Bragg reflections in X-ray standing-wave experiments and X-ray optics applications

A. Taccoen, C. Malgrange, Y. L. Zheng, J. C. Boulliard and B. Capelle

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The ab initio crystal structure solution of proteins by direct methods. I. Feasibility

C. Giacovazzo, D. Siliqi and A. Ralph

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Direct methods for incommensurate intergrowth compounds. II. Determination of the modulation using only main reflections

B.-D. Sha, H.-F. Fan, S. van Smaalen, E. J. W. Lam and P. T. Beurskens

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Quasicrystals and their approximants: dodecahedral local ordering versus canonical-cell description

V. E. Dmitrienko

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The heavy-atom problem: a statistical analysis. I. A priori determination of best scaling, level of substition, lack of isomorphism and phasing power

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The heavy-atom problem: a statistical analysis. II. Consequences of the a priori knowledge of the noise and heavy-atom powers and use of a correlation function for heavy-atom-site determination

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short communications

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On uncertainty in maximum-entropy maps and the generalization of `classic MaxEnt'

S. Hansen and S. W. Wilkins

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Determination of quasicrystalline structures: a refinement program using symmetry-adapted parameters. Erratum

L. Elcoro, J. M. Perez-Mato and G. Madariaga

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Dynamical X-ray diffraction from imperfect crystals: a solution based on the Fokker–Planck equation. Erratum

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Pseudo-Gaussian peak integrals for Fourier-map interpretation

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book reviews

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Crystallography edited by W. Borchardt-Ott

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Advances

Recently published Advances articles are given below.

Interpretation of angular symmetries in electron nanodiffraction patterns from thin amorphous specimens. A. C. Y. Liu, G. R. Lumpkin, T. C. Petersen, J. Etheridge & L. Bourgeois (2015). Acta Cryst. A71, doi:10.1107/S2053273315011845.

Identification of inversion domains in KTiOPO₄ via resonant X-ray diffraction. F. Fabrizi, P. A. Thomas, G. Nisbet & S. P. Collins (2015). Acta Cryst. A71, 361-367.

Partial order among the 14 Bravais types of lattices: basics and applications. H. Grimmer (2015). Acta Cryst. A71, 143-149.

SHELXT - Integrated space-group and crystal-structure determination. G. M. Sheldrick (2015). Acta Cryst. A71, 3-8.

Special issues

Mathematical Crystallography

Bragg centennial issue

Laue centennial issue

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