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January 2018 issue
Cover illustration: SAXS tensor tomography can probe three-dimensional nanostructure in relatively large volumes, offering the unique chance to correlate spatial nanoscale features over several millimetres [Liebi et al. (2018). Acta Cryst. A74, 12-24]. The image shows a small-angle X-ray scattering pattern (left) from a human bone sample. Around 1 000 000 single SAXS patterns were used to reconstruct the 3D orientation of the mineralized collagen fibrils (right).
advances
topical reviews
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access
The state of the art of quasicrystal research is critically reviewed. Fundamental questions that are still unanswered are discussed and experimental limitations are considered.
research papers
Open access
access
The mathematical framework and reconstruction algorithm for small-angle scattering tensor tomography are introduced in detail, as well as strategies which help to reduce the amount of data and therewith the measurement time required. Experimental validation is provided for the application to trabecular bone.
foundations
research papers
A method for constructing weavings of (mixed) overlapping nets in the plane is discussed.
It is demonstrated that, by inputting the reflection data in an incremental fashion starting with low- and medium-resolution reflections, the convergence rate of the hybrid input–output ab initio phasing algorithm can be significantly increased.
A geometric model of {
} and {
} twinning modes in magnesium and titanium alloys is proposed.
} and {} twinning modes in magnesium and titanium alloys is proposed.
Study of the limit of applicability of the Scherrer equation has found it is approximately 11.9% of the extinction length and has a maximum value because of absorption.
A method for nondestructively visualizing multisection nanostructures of integrated circuits by X-ray ptychography with a multislice approach is proposed.
book reviews
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