IKBFU's Vestnik

2018 Issue №4

Dipole antenna with stabilized input impedance

Abstract

The article is devoted to the development of a small-sized antenna system characterized by uniform input impedance over the entire operating frequency range, and structurally implemented on the basis of the fractal structure, as well as the optimization of its parameters in order to improve the basic opera­tional characteristics of the system.

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Numerical study of distribution of an impurity on watercourse with diffuse pollution

Abstract

The diffuse pollution is considered taking into account the lateral inflow. In the calculation scheme, the impurity has a small inertia, the deposition of particles is steady. Background values are set as initial conditions for the con­centration and in the initial section of the watercourse, and the intensity of the diffuse discharge along the shoreline is set. The results of solving the boundary value problem by numerical method in Mathcad are presented. The results of the study of the profiles of dimensionless concentration of the precip­itating admixture are shown. Graphs are presented in dimensionless varia­bles.

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