Optimization of Automatic Support Systems of Air Objects Based on Local Quadratic-biquadratic Functionals. I. Synthesis of Optimum Control

Journal of Computer and Systems Sciences International - The features of the functioning of the systems of automatic tracking of air objects, optimized according to the classical quadratic...     

Thermal conductivity of a multicomponent gas mixture in the presence of equilibrium chemical reactions

Using methods of the thermodynamics of irreversible processes, an expression is obtained for the thermal conductivity of multicomponent gas mixtures.     

Linear-Cubic Locally Optimal Control of Linear Systems and Its Application for Aircraft Guidance

Journal of Computer and Systems Sciences International - In the paper, the requirements for aircraft guidance methods are considered. It is noted that the existing methods of optimization of linear...     

Guidance Method on a Target within a Dense Group

Journal of Communications Technology and Electronics - The guidance method on a separate target within a dense group for the implementation of trajectory control is proposed. This control technique...     

Optimization of Control of Unmanned Aircraft,Providing Their Consistent Movement Along the Route with a Prescribed Topology

Journal of Communications Technology and Electronics - Variants of group use of unmanned aerial vehicles (UAVs) in various fields are briefly considered. Among them, the features of a group flight...     

Activity of the raw material and the firing conditions as factors in the sintering and growth of calcium titanate grains

Conclusions An investigation was carried out of the sintering of perovskite during its synthesis and of perovskite synthesized beforehand.It was established that the degree of activity of the original components is a significant factor in the synthesis and sintering of perovskite, and the relation between these processes was established. The sintering of the perovskite begins when the synthesis nears completion, i. e., above 1300°C. The application of a load of 0.6 kgf/cm² accelerates the synthesis and sintering of the perovskite.The use of perovskite synthesized at 1300°C beforehand accelerates the sintering process to a significant degree and gives a dense sintered refractory at 1400°C.The kinetics of the sintering of perovskite is expressed by the equation l/l^1/2. The recrystallization of the perovskite begins in the final stage of sintering when the open porosity of the specimens is about 6–8%.Translated from Ogneupory, No. 1, pp. 39–44, January, 1978.     

Rheological and technological properties of titanium dioxide slips and the properties of the castings

Conclusions An investigation of the rheological and technological properties of titanium dioxide slips and slip castings demonstrated the presence of two castability regions. The properties of the slip and castings are optimal in the alkaline castability region (pH 8).A study of the influence of the firing temperature of the titanium dioxide starting material on the properties of the slip and castings showed that the properties are optimal when the TiO₂ had been fired at 1550° C.An analysis of the sintering of titanium dioxide slip castings showed that the properties of the sintered castings are optimal when the castings were produced from slip with pH 8 because in this case the density of the castings is at maximum.The strength of TiO₂ castings in the sintering process depends on their porosity and that of the sintered castings on the size of the crystals.Titanium dioxide fired at 1550°C yielded castings with open porosity 1.8–2.0%, apparent density 3.90–3.92 g/cm³, _b 1020–1050 kgf/cm², acid resistance 97.5%, specific inductive capacitance 90–100, and tangent of the dielectric loss angle at 20°C and 1 MHz 8·10^–4–9·10^–4 Translated from Ogneupory, No. 3, pp. 28–33, March, 1978.