Acta Crystallographica Section A
Acta Crystallographica
Section A FOUNDATIONS AND ADVANCES

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FOUNDATIONS
ADVANCES

Volume 33| Part 1

ISSN: 2053-2733

January 1977 issue

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research papers

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The early history of the International Union of Crystallography

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Computer science and crystallography

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Algorithms and computational complexity

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A correlation between crystallographic computing and artificial intelligence research

E. A. Feigenbaum, R. S. Engelmore and C. K. Johnson

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Automated diffractometry

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Criteria for selecting and interconnecting micro, mini, midi and maxi computers

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Study of a mixed-polytype crystal of silver iodide containing a new 12H polytype

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On the diffraction of X-rays by face-centred cubic crystals containing extrinsic stacking faults

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A charge-density study of crystalline beryllium

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Errors in atomic parameters and in electron density distributions due to thermal diffuse scattering of X-rays

R. B. Helmholdt and A. Vos

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Systematic variations of Bragg peak position in neutron diffraction patterns

G. E. Bacon, N. Cowlam and A. G. Self

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On different probabilistic approaches to quartet theory

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X-ray intensity measurements on large crystals by energy-dispersive diffractometry. III. Fine structures of integrated intensities and anomalous scattering factors near the K absorption edges in GaAs

T. Fukamachi, S. Hosoya, T. Kawamura and M. Okonuki

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Transformation characteristics of 6H-based cadmium iodide polytypes

A. K. Rai and O. N. Srivastava

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The molecular replacement method. II. The translation function problem; a new translation function

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Phase refinement by a Fourier transformation of difference electron density peaks

T. Ito and I. Shibuya

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An improved method for combining isomorphous replacement and anomalous scattering diffraction data for macromolecular crystals

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The crystal structure of α-1,2,4,5-tetrachlorobenzene based on spectroscopic evidence and packing and lattice frequency calculations

E. B. Halac, E. M. Burgos, H. Bonadeo and E. A. D'Alessio

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Simultaneous four-beam Borrmann diffraction

B. Post, S. L. Chang and T. C. Huang

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The closest packing of equal spheres on a spherical surface

A. L. Mackay, J. L. Finney and K. Gotoh

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The use of structural information in the phase probability of a triple product

J. J. L. Heinerman

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The derivation of joint probability distributions of structure factors for space group P $\overline{1}$ from the corresponding distributions for space group P1

J. J. L. Heinerman

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Approximations for the calculation of high-resolution electron-microscope images of thin films

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Quadratic electrostrictive effects in LiF, NaF, NaBr, KCl, KBr, KI, RbCl, RbBr and RbI

L. Bohatý and S. Haussühl

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New algebraic and probabilistic relations between structure factors and direct space information

M. Knossow, C. de Rango, Y. Mauguen, M. Sarrazin and G. Tsoucaris

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Identification of enantiomorphously related space groups by electron diffraction

P. Goodman and T. W. Secomb

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Extinction-free measurements with plane-polarized X-rays

A. McL Mathieson

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Determination of strain distributions from X-ray Bragg reflexion by silicon single crystals

A. Fukuhara and Y. Takano

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Neutron powder diffraction and constrained refinement. The structures of p-dibromo- and p-diiodotetrafluorobenzene

G. S. Pawley, G. A. Mackenzie and O. W. Dietrich

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Lattice dynamics, thermal expansion and bulk modulus of erbium

R. R. Rao and A. Ramanand

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The structure of NaTaO₃ by X-ray powder diffraction

M. Ahtee and L. Unonius

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The crystal structures of cerium metal at high pressure

W. H. Zachariasen and F. H. Ellinger

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The intensity distribution of X-ray Pendellösung fringes

M. Wada and N. Kato

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Orientations and twinning in the structural transformation aragonite-type to calcite-like in potassium nitrate crystals

S. W. Kennedy and M. Odlyha

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Analysis of the layer sequence for crystals with stacking faults by the method of structural models: comparison with the direct method of Farkas-Jahnke

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Symmetrical cases of simultaneous X-ray diffraction and the Borrmann effect. I. The analysis of photoelectric absorption

A. M. Afanas'ev and V. G. Kohn

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Martensitic phase transitions in molecular crystals – p-dichlorobenzene

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Representation of the fast-rotation function in a polar coordinate system

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The role of Coulombic interactions in explaining the anomalous structure of pentaphenylantimony

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Radiation damage of an organic crystal

Y. Murata, J. R. Fryer, T. Baird and H. Murata

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Etude théorique de la visibilité des plans atomiques en microscopie électronique

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Ordering of hydrogen in niobium hydride phases

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The generalized inverse and inverse structure

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Prediction of density in organic crystals

A. Immirzi and B. Perini

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On the application of phase relationships to complex structures. X. MAGLIN – a successor to MULTAN

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short communications

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A definition of coordination and its relevance in the structure types AlB₂ and NiAs

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Values of ε for obtaining normalized structure factors

H. Iwasaki and T. Ito

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Dispersion corrections for X-ray atomic scattering factors

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Could acetic acid crystallize as dimers?

J. L. Derissen and P. H. Smit

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international union of crystallography

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International Union of Crystallography. Commission on Crystallographic Apparatus and Commission on Charge, Spin and Momentum Densities. A critique of Zachariasen's theory of extinction

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International Union of Crystallography. Commission on Crystallographic Apparatus and Commission on Charge, Spin and Momentum Densities. Extinction corrections: theory and experiment. Results of γ-ray diffractometry

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International Union of Crystallography. Commission on Crystallographic Apparatus and Commission on Charge, Spin and Momentum Densities. The theoretical models of extinction. Their domain of applicability

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Eleventh General Assembly and International Congress of Crystallography

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Structure Reports

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World Directory of Crystallograhers

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notes and news

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Notes and News

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book reviews

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Liquid crystals. (Proceedings of the International Conference, the Raman Institute, Bangalore, India, December 1973) edited by S. Chandrasekhar

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NMR basic principles and progress. Vol. 9. Lyotropic liquid crystals by C. L. Khetrapal, A. C. Kunwar, A. S. Tracey and P. Diehl

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Advances in liquid crystals. Vol. 1 edited by G. H. Brown

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Technische Mineralogie. Bd.8. Auflösung von Kristallen by R. B. Heimann

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Electronic structure of polymers and molecular crystals edited by J.-M. Andre and J. Ladik

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Crystal growth and characterization. (Proceedings of the Second International Spring School on Crystal Growth, Japan, 1974) edited by R. Ueda and J. B. Mullin

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Advances in structure research by diffraction methods edited by W. Hoppe and R. Mason

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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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