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Search query: nonuniform strain

20 articles match your search "nonuniform strain"

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A theoretical formulation for the diffraction from nonuniformly strained helical molecular assemblies is presented. The predictions of this theory are discussed in the context of double-stranded DNA and actin filaments in the presence and absence of nonuniform strains.

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A novel regression method for estimating intragranular strain in polycrystalline materials from three-dimensional X-ray diffraction data is presented and evaluated. The method incorporates an equilibrium constraint to the reconstructed strain field by using a Gaussian process.

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High-resolution X-ray diffraction in an Si wafer with vertical Al-doped micrometre-wide channels was studied experimentally and theoretically. The calculated reciprocal space maps of the channel and near it corroborate the experimentally obtained ones and prove their high sensitivity to structural distortions, as well as the possibility of retrieving the impurity concentration in the channel in the Bragg geometry.

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Data from several radiation-damage studies using protein crystals are reanalyzed to determine the local dose- and resolution-dependent decay of diffracted intensity at T = 100 K. The results are inconsistent with long-accepted models and with a proposed linear scaling between maximum tolerable dose and resolution, but are reproduced by a simple, physics-based model.

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DATAD, a Python-based X-ray diffraction simulation code, has been developed for simulating one- and two-dimensional diffraction patterns of a polycrystalline specimen with an arbitrary texture under an arbitrary deformation state and an arbitrary detection geometry

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Using a three-dimensional finite element analysis approach, a stress-relaxation mechanism was identified to account for the slow, nonequilibrium dynamics of a composite material observed using X-ray photon correlation spectroscopy.

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High-resolution X-ray Laue diffraction in an Si wafer patterned with vertically aligned Al-doped 100 µm-wide channels extending through the whole wafer was studied experimentally and simulated using the Takagi–Toupin dynamical diffraction theory. The calculated angular dependences of the intensities of both the diffracted and the transmitted X-ray beams corroborate the experimentally measured rocking curves and demonstrate their high sensitivity to the structural distortions in the channel.

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Simulated X-ray diffraction patterns of shock-compressed single-crystal tantalum for polychromatic synchrotron undulator sources at different shock velocities and detection geometries are presented, along with their interpretation.

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A high-resolution synchrotron X-ray diffraction study of a YCrO3 single crystal has allowed the structural parameters of the noncentrosymmetric P1211 space group to be obtained. The pathway of spin interactions was found for the formation of antiferromagnetism in YCrO3. Ferroelectricity in YCrO3 may originate from the strain-balanced Cr1—O3(O4) and Cr2—O5(O6) bonds and the local distortion modes of CrO6 octahedra in the P1211 space group. The relationship between microscopic and macroscopic properties has been revealed.

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A method to obtain the deformation profile to be imparted to an X-ray mirror in order to turn a Gaussian intensity distribution into any assigned point spread function, and how to easily check the result using physical optics.
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