We measure ^{2}H(e,e^{'}p)n cross sections at 4-momentum transfers of Q^{2}=4.5±0.5 (GeV/c)^{2} over a range of neutron recoil momenta p_{r}, reaching up to ∼1.0 GeV/c. We obtain data at fixed ...neutron recoil angles θ_{nq}=35°, 45°, and 75° with respect to the 3-momentum transfer qover →. The new data agree well with previous data, which reached p_{r}∼500 MeV/c. At θ_{nq}=35° and 45°, final state interactions, meson exchange currents, and isobar currents are suppressed and the plane wave impulse approximation provides the dominant cross section contribution. We compare the new data to recent theoretical calculations, where we observe a significant discrepancy for recoil momenta p_{r}>700 MeV/c.
This paper discusses the problems of interpreting the study results obtained for metal and mineral microinclusions by the scanning electron microscopy with energy-dispersive X-ray microanalysis, ...which are related to the matrix material effect. The method was shown to work well when studying “relatively large” (5–10 μm) microinclusions for the purpose of phase identification and semi-quantitative determination of their composition normalized to 100%. The potential for “cleaning” analysis results from “additives” caused by matrix elements, as well as the criteria for assessing a distance from boundaries of a micro-object at which the matrix effect becomes minimum, are considered. The results we obtained by means of these approaches are illustrated by examples of petrology and metallogeny of igneous rocks studied in the Kamchatka region and the Stanovoy fold belt. This study made it possible to obtain new data on petrological processes in the mantle–crust substrate under the active volcanic arc and on the ore–magmatic system evolution under the ancient active continental margin.
Abstract
The crystallization process on a cooled disk located on the free surface of a water layer is studied numerically. The influence of thermal gravitational-capillary and mixed convection on the ...shape of the crystallization front is investigated. In mixed convection modes, the speed of uniform rotation of the disk is set. The calculations were carried out in an axisymmetric formulation of the problem by the finite element method using an adaptive triangular grid and taking into account the latent heat of crystallization and the inverse dependence of density on temperature.
Abstract
Numerical studies of the convective flow of heptadecane in a horizontal layer with a suddenly applied longitudinal temperature gradient at the lower high-thermal conductivity boundary have ...been carried out by the finite element method. A system of nonstationary dimensionless equations of free convection containing stream function, velocity vortex, and temperature as variables was solved. The calculations were carried out with a free upper boundary with and without taking into account the influence of the thermocapillary effect.
The effect of crucible rotation on the evolution of the melt flow structure at a Prandtl number 16 on the temperature and velocity fields and on convective heat transfer in the Czochralski method is ...simulated numerically in the mixed convection regimes at a given crystal rotation rate. The ranges of similarity parameters corresponding to stationary and unsteady melt flows and heat transfer regimes, as well as regimes with the most uniform radial distributions of local heat fluxes are determined. In the initial regime Reynolds, Grashof and Marangoni numbers are set to ReK = 95, Gr = 4870 and Ma = 5835.
Abstract
The evolution of the flow structure and heat transfer with an increase in the characteristic temperature drop in the ranges of Grashof and Marangoni numbers 3558 ≤ Gr ≤ 7116 and 2970 ≤ Ma ≤ ...5939 are investigated numerically. The boundary of the transition to unsteady flow and heat transfer regimes has been determined.
Abstract
The process of crystallization of silicon melt on a monotonically cooled disk located on the free surface of the melt is studied numerically. The influence of thermogravitational, thermal ...gravitational-capillary and mixed convection on the shape of the crystal-melt interface is investigated. In mixed convection modes, the speed of uniform rotation of the disk is set. The calculations were carried out in an axisymmetric formulation of problems by the finite element method using an adaptive triangular mesh and taking into account the latent heat.
The non-stationary conjugate heat transfer in a rectangular model of a fully filled thin-walled tank, divided by an internal vertical partition wall into two compartments of 1/3 and 2/3 of the tank ...volume is studied numerically in the conjugate formulation. The outer surfaces of the end walls and the upper wall of the tank are heat-insulated. The lower wall suddenly warms up under the influence of a uniform heat flux. The calculations are performed at the ratio of the thermal conductivity of solid walls to the thermal conductivity of fuel λs/λf = 1041.3 and λs/λf = 1 (low-heat partition wall) and thermal parameters of fuel T1 (Prandtl number Pr = 25.66). The influence of internal vertical partitions wall on the spatial shape of convective flows and the regularities of non-stationary conjugate heat exchange is studied. The temperature fields in the liquid and in the tank walls are calculated.
Abstract
A swarm of mobile robots, as a system of relatively simple interconnected controlled objects, performs a common task simultaneously and in a distributed manner. When planning swarm ...operations associated with the creation in the service area through the frontal band of the zones of operation of the target equipment there is a need to consider the possibility of its operational regrouping, since at the time of planning the exact purpose of the swarm operation has not yet been determined, or is a secret, or is determined by a number of random circumstances. The execution of the swarm operation is advisable to carry out in two phases. The first phase starts even before the resolution of these uncertainties by creating a basic random network with a relatively small concentration of robots. In the second phase, after resolving the uncertainty, a programmable percolation route is formed by local rearrangement of the swarm objects, which provides a predetermined coverage of the target equipment of the robots with a certain service zone. A modified ant algorithm with evolutionary learning is considered in order to quickly solve the swarm problem of two-phase operation. In this case, you can significantly reduce the time for the operation.
Abstract
A swarm of robots, as a system of relatively simple interconnected managed objects, performs a common task simultaneously and in a distributed manner. When planning swarm operations ...associated with the creation in the service area through the front strip of the zones of the trust instrument - payload objects swarm, there is a problem of transmitting a signal from one robot to another for operational rearrangement of the swarm, as at the time of planning the exact purpose of the swarm operation has not yet been determined, or is a secret, or is determined by a number of random circumstances. The execution of the swarm operation is advisable to carry out in two phases, and the first phase to start even before the resolution of these uncertainties by creating a basic random network with a small concentration of robots in it. In the second phase of the operation, a programmable percolation route is formed by local rearrangement of the robots, which provides target coverage of the target equipment of the swarm objects of a certain service zone. In this case, you can significantly reduce the time of the operation. The corresponding analytical dependences were obtained.
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