The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform
Tetsuya Ogita - One of the best experts on this subject based on the ideXlab platform.
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Effects of Molecular Orientation and Crystallinity on Measurement by X-Ray Diffraction of the Crystal Lattice Modulus of Poly(vinyl alcohol) Prepared by Gelation/Crystallization from Solution
Polymer Journal, 1993Co-Authors: Masaru Matsuo, Yuko Harashina, Tetsuya OgitaAbstract:The Crystal Lattice modulus of poly(vinyl alcohol) was measured by X-ray diffraction using films which were prepared by gelation/Crystallization from solution and elongated in a silicon oil after evaporating solvent. The measured Crystal Lattice modulus of specimen with Young’s modulus 13–20 GPa was in the range 200–220 GPa. These values were lower than that for polyethylene measured by using ultradrawn films. To check the morphology dependence of the measured Crystal Lattice modulus of poly(vinyl alcohol), a numerical calculation was carried out by considering molecular orientation and Crystallinity. In this calculation, a three-dimensional model was employed, in which oriented Crystalline layers are surrounded by oriented amorphous phase and the strains of the two phases at the boundary are identical. The theoretical results indicate that the difference between the Crystal Lattice modulus as measured by X-ray diffraction and the intrinsic value becomes less pronounced and Young’s modulus of a sample becomes lower when a series coupling between Crystalline and amorphous phases is predominant. A series of numerical calculations for the system with low Crystallinity and orientational degree of amorphous chain segments indicates that the real value of the Crystal Lattice modulus is slightly higher than 200–220 GPa measured by X-ray diffraction.
G. W. Crabtree - One of the best experts on this subject based on the ideXlab platform.
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Crystal-Lattice coupling to the vortex-melting transition in YBa(2)Cu(3)O(7-delta).
Physical review letters, 2003Co-Authors: Rolf Walter Lortz, Christoph Meingast, Ulrich Welp, Wai-kwong Kwok, G. W. CrabtreeAbstract:Distinct discontinuities in the thermal expansion of the Crystal Lattice are observed at the melting transition of the vortex Lattice in a naturally untwinned reversible YBa(2)Cu3O(7-delta) single Crystal using high-resolution dilatometry. This coupling between the vortex transition and the Crystal Lattice demonstrates that the Crystal Lattice is more than a mere host for the vortices, and it is attributed to a strong pressure dependence of the superconducting transition temperature and thus to the condensation energy at the vortex-melting temperature.
Masaru Matsuo - One of the best experts on this subject based on the ideXlab platform.
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Effects of Molecular Orientation and Crystallinity on Measurement by X-Ray Diffraction of the Crystal Lattice Modulus of Poly(vinyl alcohol) Prepared by Gelation/Crystallization from Solution
Polymer Journal, 1993Co-Authors: Masaru Matsuo, Yuko Harashina, Tetsuya OgitaAbstract:The Crystal Lattice modulus of poly(vinyl alcohol) was measured by X-ray diffraction using films which were prepared by gelation/Crystallization from solution and elongated in a silicon oil after evaporating solvent. The measured Crystal Lattice modulus of specimen with Young’s modulus 13–20 GPa was in the range 200–220 GPa. These values were lower than that for polyethylene measured by using ultradrawn films. To check the morphology dependence of the measured Crystal Lattice modulus of poly(vinyl alcohol), a numerical calculation was carried out by considering molecular orientation and Crystallinity. In this calculation, a three-dimensional model was employed, in which oriented Crystalline layers are surrounded by oriented amorphous phase and the strains of the two phases at the boundary are identical. The theoretical results indicate that the difference between the Crystal Lattice modulus as measured by X-ray diffraction and the intrinsic value becomes less pronounced and Young’s modulus of a sample becomes lower when a series coupling between Crystalline and amorphous phases is predominant. A series of numerical calculations for the system with low Crystallinity and orientational degree of amorphous chain segments indicates that the real value of the Crystal Lattice modulus is slightly higher than 200–220 GPa measured by X-ray diffraction.
Daniel E Otzen - One of the best experts on this subject based on the ideXlab platform.
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promoting protein self association in non glycosylated thermomyces lanuginosus lipase based on Crystal Lattice contacts
Biochimica et Biophysica Acta, 2015Co-Authors: Jens Kvist Madsen, Thomas Sorensen, Jorn Dovling Kaspersen, Maria Silow, Jesper Vind, Jan Skov Pedersen, Allan Svendsen, Daniel E OtzenAbstract:Abstract We have used the Crystal structure of Thermomyces lanuginosus lipase (TlL) to identify and strengthen potential protein–protein interaction sites in solution. As wildtype we used a deglycosylated mutant of TlL (N33Q). We designed a number of TlL mutants to promote interactions via interfaces detected in the Crystal-Lattice structure, through strengthening of hydrophobic, polar or electrostatic contacts or truncation of sterically blocking residues. We identify a mutant predicted to lead to increased interfacial hydrophobic contacts (N92F) that shows markedly increased self-association properties on native gradient gels. While wildtype TlL mainly forms monomer and 2 M) of urea to dissociate. We conclude that Crystal Lattice contacts are a good starting point for design strategies to promote protein self-association.
Paul R Dawson - One of the best experts on this subject based on the ideXlab platform.
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formulation and characterization of a continuous Crystal Lattice orientation finite element method lofem and its application to dislocation fields
Journal of The Mechanics and Physics of Solids, 2019Co-Authors: Robert Carson, Paul R DawsonAbstract:Abstract Since the 1950s, a large body of work has been published on connecting the curvature of a Crystal Lattice to geometrically necessary dislocations densities of a Crystal Lattice. Studying dislocation transmission through grains and across their boundaries requires the Lattice curvature to be preserved. However, traditional Crystal plasticity models and their numerical implementations do not formally preserve Lattice curvature. In this paper, a continuous Crystal Lattice orientation finite element method (LOFEM) is proposed to rectify this impediment to the inclusion of dislocation-based constitutive models. The methodology is first presented, and then it is demonstrated for tension and compression deformations of a copper polyCrystal. It is shown that under the same deformation histories, the Lattice continuity constraint alters the evolving state in comparison to the traditional approach, including retarding the rate at which the Crystallographic texture strengthens under monotonic deformation. Taking advantage of the finite element representation of the Lattice orientation, the Nye tensor is computed on Lattices misoriented by deformation and is subsequently used to compute evolving dislocation density distributions.
