181 research outputs found
Temporal characterization of rock dynamic destruction
Dynamic strength tests published in literature have been analysed by structuraltemporal damage criteria. Parameter τ - incubation time - describing material stability behaviour under high-rate influences have been estimated for Kimachi sandstone, Inada granite and Tage tuff. Two types of dynamic tensile experiments have been used: split Hopkinson pressure bar and spalling. Purely dynamic effect of fracture delay have been observed in the case of Kimachi sandstone and discussed
Pionic atoms probing pi-NN resonances
The pion optical potential generated by the hypothetical pi-NN-coupled
NN-decoupled dibaryon resonance d'(2065) is calculated to the lowest order in
nuclear matter density. The contribution to the pion optical potential is found
to be within the empirical errors, so the d'(2065) existence currently does not
contradict to the observed properties of the pi-nucleus bound states. Future
progress in the pionic X-ray spectroscopy can reveal contributions of pi-NN
resonances to energy levels and widths of the pionic atoms.Comment: 3 pages REVTEX, 1 ps figur
Nanostructural features of anodic zirconia synthesized using different temperature modes
Nanotubular and nanoporous structures of ZrO 2 were synthesized by potentiostatic anodization with varying the temperatures of anode in the range of T A = 0 - 90 °C and electrolyte in the range of T El = 20 - 50 °C. It was shown that difference between T A and T El had significant influence on growth rate and morphology type of zirconia nanostructures. Optimal parameters of thermal modes for nanotubular ZrO 2 synthesis were discussed. © 2018 Institute of Physics Publishing. All rights reserved.Act 211 Government of the Russian Federation, contract № 02.A03.21.0006, supported the study. R.V.K. thanks RFBR research project № 18-33-01072 for support. A.S.V. and I.A.W. thank Minobrnauki initiative research project № 16.5186.2017/8.9 for support
Calorons and monopoles from smeared SU(2) lattice fields at non-zero temperature
In equilibrium, at finite temperature below and above the deconfining phase
transition, we have generated lattice SU(2) gauge fields and have exposed them
to smearing in order to investigate the emerging clusters of topological
charge. Analysing in addition the monopole clusters according to the maximally
Abelian gauge, we have been able to characterize part of the topological
clusters to correspond either to non-static calorons or static dyons in the
context of Kraan-van Baal caloron solutions with non-trivial holonomy. We show
that the relative abundance of these calorons and dyons is changing with
temperature and offer an interpretation as dissociation of calorons into dyons
with increasing temperature. The profile of the Polyakov loop inside the
topological clusters and the (model-dependent) accumulated topological cluster
charges support this interpretation. Above the deconfining phase transition
light dyons (according to Kraan-van Baal caloron solutions with almost trivial
holonomy) become the most abundant topological objects. They are presumably
responsible for the magnetic confinement in the deconfined phase.Comment: 11 pages, 7 figures, Paper has been thoroughly revised, 1 section and
1 figure have been added, corresponds to the published versio
Antineutrino-Deuteron Experiment at Krasnoyrsk
This report is represented the results of some experiments, which carried out
at the neutrino underground laboratory of Kranoyarsk nuclear plant.Comment: 8 pages, 3 figure
Calorons and dyons at the thermal phase transition analyzed by overlap fermions
In a pilot study, we use the topological charge density defined by the
eigenmodes of the overlap Dirac operator (with ultraviolet filtering by
mode-truncation) to search for lumps of topological charge in SU(2) pure gauge
theory. Augmenting this search with periodic and antiperiodic temporal boundary
conditions for the overlap fermions, we demonstrate that the lumps can be
classified either as calorons or as separate caloron constituents (dyons).
Inside the topological charge clusters the (smeared) Polyakov loop is found to
show the typical profile characteristic for calorons and dyons. This
investigation, motivated by recent caloron/dyon model studies, is performed at
the deconfinement phase transition for SU(2) gluodynamics on 20^3 x 6 lattices
described by the tadpole improved L\"uscher-Weisz action. The transition point
has been carefully located. As a necessary condition for the caloron/dyon
detection capability, we check that the LW action, in contrast to the Wilson
action, generates lattice ensembles, for which the overlap Dirac eigenvalue
spectrum smoothly behaves under smearing and under the change of the boundary
conditions.Comment: 17 pages, 8 figures, minor changes (typos, grants, ..
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