forthcoming articles

The following articles are a selection of those recently accepted for publication in Acta Crystallographica Section A: Foundations and Advances.

See also Forthcoming articles in all IUCr journals.

Accepted 8 June 2017

High-resolution X-ray diffraction with no sample preparation

A novel, high-resolution X-ray diffraction (XRD) technique that provides completely non-destructive, high-quality XRD analyses of unprepared samples is demonstrated. The method shows great potential in the characterization of cultural heritage artefacts.

Accepted 27 May 2017

Three-dimensional single-cell imaging with X-ray waveguides in the holographic regime

Phase-contrast X-ray imaging of biological cells in two and three dimensions can be carried out with a low dose, based on free propagation and a setting of optimized wavefronts in cone-beam geometry. In order to reach the required contrast level, images have to be recorded in the holographic regime. The main result of this work is holographic recordings of a quality that is fully amenable to quantitative phase retrieval, beyond previous approximations. Different approaches to sample preparations, data recording and phase retrieval are compared.

Accepted 9 May 2017

Close-packed structures with finite-range interaction: computational mechanics of layer pair interaction

Computational mechanics is used to solve the Ising next-nearest-neighbour model in the context of close-packed polytype analysis. The stacking arrangement is seen as an information processing system generating symbols. A general method for solving the stochastic matrix of the random Gibbs field is described and applied. The ∊-machine of the process is built which allows one to describe the system statistically. The occurrence of higher-order polytypes at the borders of the phase diagram is discussed.

Accepted 8 May 2017

Wavevector substar group in reciprocal-lattice space and its representation

This paper establishes a new conception of the wavevector substar group and its representation.

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