We study the topology of 3-D symmetric tensor elds. The goal is to represent their complex structure by a simple set of carefully chosen points and lines analogous to vector eld topology. The basic constituents of tensor topology are the degenerate points, or points where eigenvalues are equal to each other. First, we introduce a new method for locating 3-D degenerate points. We then extract th...

Possibilities and realization of system for control of more entry doors and ventilation in industry based on using wireless computer network technology are considered and described in the paper. Described solution has possibility to monitor, control and perform diagnostic of system using wireless computer network. The system is consisted of set of sensors, actuators and control devices (PLCs). ...

A three-dimensional (3D) Dirac semimetal (SM) is the 3D analogue of graphene having linear energy dispersion around Fermi points. Owing to the nontrivial topology of electronic wave functions, the 3D Dirac SM shows nontrivial physical properties and hosts various exotic quantum states such as Weyl SMs and topological insulators under proper external conditions. There are several kinds of Dirac ...