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Vol 44, No 2 (2017)
- Year: 2017
- Articles: 6
- URL: https://journals.rcsi.science/1068-3356/issue/view/14092
Article
Apparatus for visualizing the energy release in a water phantom irradiated with the proton beam of the radiotherapeutic accelerator
Abstract
An apparatus for visualizing the energy release region in a water phantom is developed and tested on the proton beam of the radiotherapeutic accelerator. The shape and sizes of the emission region during pulsed irradiation of the phantom with the proton beam is experimentally determined in the form of Bragg curves. The results are compared with model calculations.
29-32
33-35
On a partial solution of the diffusion equation
Abstract
The process is considered of establishing the equilibrium spatial distribution of the concentration of particles in a one-dimensional bounded space region, subjected to a constant force normal to impermeable region boundaries. This process is described by the solution of the third boundary-value problem with homogeneous boundary conditions for the two-dimensional parabolic equation. It is shown that the found solution to the seemingly well-known problem of mathematical physics, but being of great importance in applications, cannot be obtained using theGreen’s function of this problem, known in the literature.
36-39
Properties of the difference method for searching for anisotropy of primary cosmic rays
Abstract
Methodical properties and features of the original difference method for searching for the anisotropy in the knee region of the primary cosmic ray energy spectrum are analyzed. It is shown that the method in which properties of particle fluxes, rather than intensities, are studied is stable to randomexperimental errors andmakes it possible to separate anomalies associatedwith the laboratory coordinate system from anomalies in the celestial coordinates. The method uses multiple scattering of charged particles in galactic magnetic fields for studying the entire celestial sphere, including sky regions beyond the installation line of sight.
40-45
Multifrequency stimulated Raman scattering of light in liquid nitrogen infiltrated into 3D photonic crystals
Abstract
Spectral characteristics of stimulated Raman scattering at least in synthetic opal matrices infiltrated with liquid nitrogen upon excitation by nanosecond laser pulses are studied. The effect of the stop band position on the generation efficiency of anti-Stokes components of stimulated Raman scattering up to the third order is demonstrated. The excitation threshold of stimulated Raman scattering in liquid nitrogen infiltrated into opals is significantly lower in comparison with the generation in bulk samples.
46-49
Computational simulation of thermal hydraulic processes in the core and fuel assembly in the liquid-metal fast-breader reactor in the porous medium approximation
Abstract
The results of numerical simulation of the sodium coolant flow in the fuel assembly with partial blocking of its cross section are presented. A comparison of the results obtained with experimental data confirmed the operability of the APMod module intended for simulating heat exchange processes in cores and heat exchange equipment of promising nuclear reactors.
50-52