Abstract: This paper constructs discrete-event models for the basic elements of railway networks, i.e., a station-to-station block with a passing track, a segment (as a part of a station-tostation block), a segment section (a block section), a railway point, as well as train operation models. All models represent Petri nets with bounding arcs. The group control of the models under the parallel-conveyor movements of trains is implemented by special control elements (the so-called supervisors) that ensure railway traffic safety requirements.

We consider the fundamentals of the energy-based approach to spatial motion control. The resulting energy balance equation establishes quantitative relations between all energy sources and consumers in the system of objects “flying vehicle—thrust system—external environment.” We establish the structure and further modification of an energy-based flight control system. The energy balance equation lets us estimate the level of atmospheric disturbances and formulate the commanding control index for engine thrust under winds of complex structure. For ground-based stages, we show a prediction method for the takeoff energy possibilities with air traffic obstacles; for situations of interrupted takeoff, the possibilities to stop inside the runway.

Приведены результаты исследования магниторезистивной головки-градиометра для измерения приповерхностных магнитных полей.

This paper studies estimation methods for the statistical characteristics of stochastic processes with measuring the number of crossings of a certain level by a stochastic process and overshoot durations. The authors present approximate computing formulas for mathematical expectation and variance.