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Том 74, № 6 (2019)
- Год: 2019
- Статей: 4
- URL: https://journals.rcsi.science/0027-1330/issue/view/10045
Article
137-146
Oil Displacement by Water-Gas Mixtures with Heat Release
Аннотация
Some numerical results obtained by modeling the thermogas displacement of oil from a porous reservoir are discussed. The displacement is performed by a heated water-gas mixture. The injected two-component gas consists of nitrogen and oxygen. Heat, carbon dioxide, and water vapors are released during the reaction process. The heat release decreases the oil viscosity and accelerates the displacement process.
147-152
Inertial Reference Frames for Subsystems of Deformable Bodies
Аннотация
It is assumed that a certain reference frame is inertial for a system of moving and interacting bodies called a large system. In the framework of classical continuum mechanics, some necessary and sufficient conditions are obtained for the existence of a reference frame for a subsystem of this large system considered as an independent large system. The motion of such a new reference frame with respect to the old reference frame (with the accuracy up to the Galilean transformations) is specified.
153-158
Minimax Optimization for a System of Line-of-Sight Stabilization
Аннотация
The minimax problem of stabilization is solved for a line of sight near a programmed trajectory. The motion of this line is described by a system of fourth-order linear differential equations. In this problem, the perturbations are considered as the deviations of the initial position from zero and as time-varying perturbations. The stabilization is performed by a linear feedback. The feedback coefficients are obtained as optimal for the worst possible perturbations.
159-163