issue contents

ISSN: 2053-2733

September 2013 issue

Highlighted illustration

Cover illustration: Influence of Bragg diffraction on the phase shift of neutrons passing through a perfect silicon crystal. Depending on the crystal orientation, various Bragg conditions can be fulfilled resulting in an increase (red) or decrease (blue) of the ordinary refractive phase shift. [Lemmel (2013). Acta Cryst. A69, 459-474].

research papers

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The theory and measurement of the neutron phase shift, index of refraction or coherent scattering length of perfect crystal samples in a neutron interferometer are described. Residual phase corrections far off-Bragg are identified as local field corrections.

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Within the scope of the classical theoretical models, the diffuse scattering intensities (caused by the short-range atomic order) near the Bragg reflection in a (para)magnetic bulk face-centred cubic Ni3Fe-type permalloy are investigated, taking into account the long-range magnetic order and `strain-induced' effects. The analytic azimuthal and nonanalytic `radial' behaviours of the diffuse intensities as well as the `mixing' energy Fourier components are analysed in detail.

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It is shown that the 15 minimal nets can serve as the labyrinth graph of one or other of the five known minimal surfaces of genus 3 and that the enumeration of such surfaces is likely to be complete.

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A semi-transparent central stop has been used for ptychographic coherent diffractive imaging to increase the effective dynamic range in the recording of the far-field diffraction patterns. In this way, the high flux density provided by nano-focusing Kirkpatrick–Baez mirrors can be fully exploited for high resolution and quantitative phase reconstructions.

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A model of the face-centred-cubic to body-centred-cubic martensitic transformation based on Pitsch distortion explains the continuum of martensite variant orientations observed in electron backscatter diffraction.

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The cone of positive-definite quadratic forms is subdivided into subcones of combinatorial types of primitive parallelohedra in Ed, 2 ≤ d ≤ 6. An efficient algorithm is described.

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A general class of iterative projection algorithms is proposed as a tool for phase determination in protein crystallography. The main iterative projection algorithms are described as well as their potential application to protein crystallography.


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