1,987 research outputs found
Self-organization of adatom adsorption structure at interaction with tip of dynamic force microscope
The formation of an adatom adsorption structure in dynamic force microscopy
experiment is shown as a result of the spontaneous appearance of shear strain
caused by external supercritical heating. This transition is described by the
Kelvin-Voigt equation for a viscoelastic medium, the relaxation
Landau-Khalatnikov equation for shear stress, and the relaxation equation for
temperature. It is shown that these equations formally coincide with the
synergetic Lorenz system, where the shear strain acts as the order parameter,
the conjugate field is reduced to the stress, and the temperature is the
control parameter. Within the adiabatic approximation, the steady-state values
of these quantities are found. Taking into account the sample shear modulus vs
strain dependence, the formation of the adatom adsorption configuration is
described as the first-order transition. The critical temperature of the tip
linearly increases with the growth of the effective value of the sample shear
modulus and decreases with the growth of its typical value.Comment: 10 pages, 3 figure
Development of natural underground ore mining technologies in energy distributed massifs
The object of research is the technology and facilities for underground mining of ores in the disrupted massifs. One of the most problematic places is the formation of man-made voids; which influence the occurrence and redistribution of stress-strain state (SSS) of the rock massif. Their existence in the earth's crust provokes the influence of geomechanical and seismic phenomena; up to the level of earthquakes.
The study used:
– data from literature sources and patent documentation in the field of technologies and facilities for underground mining of ores in the energy-disrupted massifs of substantiation of technological parameters of operating units;
– laboratory and production experiments;
– physical modeling and selection of compositions of solidifying mixtures.
Analytical researches; comparative analysis of theoretical and practical results by standard and new methods with the participation of the authors were performed.
The questions of seismogeodynamic monitoring of the SSS of the rock massif during the safe development of rock-type ore deposits are considered. The interaction of natural and man-made systems providing geomechanical balance of ore-bearing massifs is shown. Possibilities of controlling the geomechanics of a massif with filling of man-made voids with various solid mixtures and tails of underground leaching of metals from substandard ores are investigated. The typification of processes is given and the distinctive features of underground block leaching of metals from rock ores are formulated in the aspect of controlling the geodynamics of the massif. The principle estimation of the combined technologies with rationalization of use of the SSS of the rock massif for regulation of the sign and magnitude of stresses in natural and artificial conditions is shown. The conclusions about the effectiveness of the controlled interaction of natural and man-made systems; ensuring the geomechanical balance of massifs and the earth's surface in the area of subsoil development over a long period of time. The research results can be used in the underground development of ore deposits of complex structure of Ukraine; the Russian Federation; the Republic of Kazakhstan and other developed mining countries of the world
Dynamics of the vortex line density in superfluid counterflow turbulence
Describing superfluid turbulence at intermediate scales between the
inter-vortex distance and the macroscale requires an acceptable equation of
motion for the density of quantized vortex lines . The closure of such
an equation for superfluid inhomogeneous flows requires additional inputs
besides and the normal and superfluid velocity fields. In this paper
we offer a minimal closure using one additional anisotropy parameter .
Using the example of counterflow superfluid turbulence we derive two coupled
closure equations for the vortex line density and the anisotropy parameter
with an input of the normal and superfluid velocity fields. The
various closure assumptions and the predictions of the resulting theory are
tested against numerical simulations.Comment: 7 pages, 5 figure
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