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L I Slepyan - One of the best experts on this subject based on the ideXlab platform.
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brittle fracture in a Periodic Structure with internal potential energy spontaneous crack propagation
Proceedings of The Royal Society A: Mathematical Physical and Engineering Sciences, 2014Co-Authors: M V Ayzenbergstepanenko, Gennady Mishuris, L I SlepyanAbstract:Ayzenberg-Stepanenko, M., Mishuris, G., Slepyan, L. (2014). Brittle fracture in a Periodic Structure with internal potential energy. Spontaneous crack propagation. Proceedings of the Royal Society A: Mathematical, Physical & Engineering Sciences, 470 (2167), [20140121].
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brittle fracture in a Periodic Structure with internal potential energy spontaneous crack propagation
arXiv: Soft Condensed Matter, 2014Co-Authors: M V Ayzenbergstepanenko, Gennady Mishuris, L I SlepyanAbstract:Spontaneous brittle fracture is studied based on the recently introduced model (Mishuris and Slepyan, Brittle fracture in a Periodic Structure with internal potential energy. Proc. Roy. Soc. A, in press). A Periodic Structure is considered, where only the prospective crack-path layer is specified as a discrete set of alternating initially stretched and compressed bonds. A bridged crack destroying initially stretched bonds may propagate under a certain level of the internal energy without external sources. The general analytical solution with the crack speed $-$ energy relation is presented in terms of the crack-related dynamic Green's function. For the anisotropic two-line chain and lattice considered earlier in quasi-statics, the dynamic problem is examined in detail. The crack speed is found to grow unboundedly as the energy approaches its upper limit. It is revealed that the spontaneous fracture can occur in the form of a pure bridged, partially bridged or fully open crack depending on the internal energy level. Generally, the steady-state mode of the crack propagation is found to be realised, whereas an irregular growth, clustering and the crack speed oscillations are detected in a vicinity of the lower bound of the energy.
M V Ayzenbergstepanenko - One of the best experts on this subject based on the ideXlab platform.
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brittle fracture in a Periodic Structure with internal potential energy spontaneous crack propagation
Proceedings of The Royal Society A: Mathematical Physical and Engineering Sciences, 2014Co-Authors: M V Ayzenbergstepanenko, Gennady Mishuris, L I SlepyanAbstract:Ayzenberg-Stepanenko, M., Mishuris, G., Slepyan, L. (2014). Brittle fracture in a Periodic Structure with internal potential energy. Spontaneous crack propagation. Proceedings of the Royal Society A: Mathematical, Physical & Engineering Sciences, 470 (2167), [20140121].
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brittle fracture in a Periodic Structure with internal potential energy spontaneous crack propagation
arXiv: Soft Condensed Matter, 2014Co-Authors: M V Ayzenbergstepanenko, Gennady Mishuris, L I SlepyanAbstract:Spontaneous brittle fracture is studied based on the recently introduced model (Mishuris and Slepyan, Brittle fracture in a Periodic Structure with internal potential energy. Proc. Roy. Soc. A, in press). A Periodic Structure is considered, where only the prospective crack-path layer is specified as a discrete set of alternating initially stretched and compressed bonds. A bridged crack destroying initially stretched bonds may propagate under a certain level of the internal energy without external sources. The general analytical solution with the crack speed $-$ energy relation is presented in terms of the crack-related dynamic Green's function. For the anisotropic two-line chain and lattice considered earlier in quasi-statics, the dynamic problem is examined in detail. The crack speed is found to grow unboundedly as the energy approaches its upper limit. It is revealed that the spontaneous fracture can occur in the form of a pure bridged, partially bridged or fully open crack depending on the internal energy level. Generally, the steady-state mode of the crack propagation is found to be realised, whereas an irregular growth, clustering and the crack speed oscillations are detected in a vicinity of the lower bound of the energy.
Mark Birkinshaw - One of the best experts on this subject based on the ideXlab platform.
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Periodic Structure in the megaparsec scale jet of pks 0637 752
The Astrophysical Journal, 2012Co-Authors: L Godfrey, J E J Lovell, Sarah Burkespolaor, R D Ekers, G V Bicknell, Mark BirkinshawAbstract:Wepresent 18GHzAustraliaTelescope Compact Arrayimagingof themegaparsec-scale quasar jetPKS0637−752 with angular resolution ∼0. �� 58. We draw attention to a spectacular train of quasi-Periodic knots along the inner 11 �� of the jet, with average separation ∼1.1 arcsec (7.6 kpc projected). We consider two classes of model to explain the Periodic knots: those that involve a static pattern through which the jet plasma travels (e.g., stationary shocks) and those that involve modulation of the jet engine. Interpreting the knots as re-confinement shocks implies the jet kinetic power Qjet ∼ 10 46 erg s −1 , but the constant knot separation along the jet is not expected in a realistic external density profile. For models involving modulation of the jet engine, we find that the required modulation period is 2 ×10 3 yr <τ <3 ×10 5 yr. The lower end of this range is applicable if the jet remains highly relativistic on kiloparsec scales, as implied by the IC/CMB model of jet X-ray emission. We suggest that the Periodic jet Structure in PKS 0637−752 may be analogous to the quasi-Periodic jet modulation seen in the microquasar GRS 1915+105, believed to result from limit cycle behavior in an unstable accretion disk. If variations in the accretion rate are driven by a binary black hole, the predicted orbital radius is 0. 7p c a 30 pc, which corresponds to a maximum angular separation of ∼0.1‐5 mas.
Gennady Mishuris - One of the best experts on this subject based on the ideXlab platform.
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brittle fracture in a Periodic Structure with internal potential energy spontaneous crack propagation
Proceedings of The Royal Society A: Mathematical Physical and Engineering Sciences, 2014Co-Authors: M V Ayzenbergstepanenko, Gennady Mishuris, L I SlepyanAbstract:Ayzenberg-Stepanenko, M., Mishuris, G., Slepyan, L. (2014). Brittle fracture in a Periodic Structure with internal potential energy. Spontaneous crack propagation. Proceedings of the Royal Society A: Mathematical, Physical & Engineering Sciences, 470 (2167), [20140121].
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brittle fracture in a Periodic Structure with internal potential energy spontaneous crack propagation
arXiv: Soft Condensed Matter, 2014Co-Authors: M V Ayzenbergstepanenko, Gennady Mishuris, L I SlepyanAbstract:Spontaneous brittle fracture is studied based on the recently introduced model (Mishuris and Slepyan, Brittle fracture in a Periodic Structure with internal potential energy. Proc. Roy. Soc. A, in press). A Periodic Structure is considered, where only the prospective crack-path layer is specified as a discrete set of alternating initially stretched and compressed bonds. A bridged crack destroying initially stretched bonds may propagate under a certain level of the internal energy without external sources. The general analytical solution with the crack speed $-$ energy relation is presented in terms of the crack-related dynamic Green's function. For the anisotropic two-line chain and lattice considered earlier in quasi-statics, the dynamic problem is examined in detail. The crack speed is found to grow unboundedly as the energy approaches its upper limit. It is revealed that the spontaneous fracture can occur in the form of a pure bridged, partially bridged or fully open crack depending on the internal energy level. Generally, the steady-state mode of the crack propagation is found to be realised, whereas an irregular growth, clustering and the crack speed oscillations are detected in a vicinity of the lower bound of the energy.
Takashi Hayashi - One of the best experts on this subject based on the ideXlab platform.
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supramolecular hemoprotein assembly with a Periodic Structure showing heme heme exciton coupling
Journal of the American Chemical Society, 2018Co-Authors: Koji Oohora, Nishiki Fujimaki, Ryota Kajihara, Hiroki Watanabe, Takayuki Uchihashi, Takashi HayashiAbstract:A supramolecular assembly of units of cytochrome b562 with externally attached heme having intermolecular linkages formed via the heme–heme pocket interaction was investigated in an effort to construct a well-defined Structure. The engineered site for surface attachment of heme at Cys80 in an N80C mutant of cytochrome b562 provides the primary basis for the formation of the Periodic assembly Structure, which is characterized herein by circular dichroism (CD) spectroscopy and high-speed atomic force microscopy (AFM). This assembly represents the first example of the observation of a split-type Cotton effect by heme–heme exciton coupling in an artificial hemoprotein assembly system. Molecular dynamics simulations validated by simulated CD spectra, AFM images, and mutation experiments reveal that the assembly has a Periodic helical Structure with 3 nm pitches, suggesting the formation of the assembled Structure is driven not only by the heme–heme pocket interaction but also by additional secondary hydrogen b...
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Supramolecular Hemoprotein Assembly with a Periodic Structure Showing Heme–Heme Exciton Coupling
2018Co-Authors: Koji Oohora, Nishiki Fujimaki, Ryota Kajihara, Hiroki Watanabe, Takayuki Uchihashi, Takashi HayashiAbstract:A supramolecular assembly of units of cytochrome b562 with externally attached heme having intermolecular linkages formed via the heme–heme pocket interaction was investigated in an effort to construct a well-defined Structure. The engineered site for surface attachment of heme at Cys80 in an N80C mutant of cytochrome b562 provides the primary basis for the formation of the Periodic assembly Structure, which is characterized herein by circular dichroism (CD) spectroscopy and high-speed atomic force microscopy (AFM). This assembly represents the first example of the observation of a split-type Cotton effect by heme–heme exciton coupling in an artificial hemoprotein assembly system. Molecular dynamics simulations validated by simulated CD spectra, AFM images, and mutation experiments reveal that the assembly has a Periodic helical Structure with 3 nm pitches, suggesting the formation of the assembled Structure is driven not only by the heme–heme pocket interaction but also by additional secondary hydrogen bonding and/or electrostatic interactions at the protein interfaces of the assembly
