Conceptual analysis of the "ramjet-in-tube" accelerator capabilities for the small projectiles acceleration up to velocities of 10-12 km/s has been performed. Result of calculations in one-dimensional quasy-steady approximation have clearly shown, that, even if the most favourable high energy mixture "hydrogen + oxygen" and optimum modes of the combustion are used, maximum velocity, which one can reach in this device, does not exceed 7.6 km/s, because of energy limit. Another techniques for attainable velocities offered with the help of the pushing piston, which. is following the accelerated projectile with not so large velocity 

Plane motion of rotary system is being viewed at this paper. Rotary system includes disk wing, inner drum and retractable blades that are connected by cables to the drum. Disk wing and inner drum are rotation around common axis. Axis of rotor is fixed elastically. Equations of motion are written for case, when all bodies are absolutely rigid. Results of numerous calculations for developed mathematical model are presented 

В 1916 году по постановлению Российского Совета министров каждые 2-3 месяца производились призывы в действующую армию студентов младших курсов. В Центральном Государственном Историческом архиве в фонде Петроградского политехнического института хранится именной список студентов, призванных в октябре 1916 г., в котором под номером 19 числится Шаргей Александр Игнатьевич, родившийся 9 июня 1897 года, мещанин, православный, студент 1 курса механического отделения. А в 1973 году вышел 13-й том Большой Советской Энциклопедии, и в нем родившийся 9 июня 1897 года Кондратюк Юрий Васильевич назван “одним из пионеров разработки основ космонавтики”. Казалось бы, какая связь (кроме даты рождения) между этимя двумя людьми? Однако эту связь на протяжении многих лет устанавливали отдельные исследователи жизни Кондратюка, организации, союзные ведомства и, наконец, прессбюро КГБ СССР.

Статья построена следующим образом.

In article the approach to the analysis of safety of the ground space infrastructure elements operation is stated. Its originality quantitatively enables to estimate safety in view of monitoring results of a technical condition parameters of the specified objects, to define the most suitable for management of safety parameters and to prove of maintenance its required level methods 

In article the optimization problem of works duration on pumping out space cryogenic systems heat insulation is solved. The criterion of a minimum of the total explotation cost is used. Expenses physical models of processes in heat insulation are fixed in a basis of modelling. The offered approach allows to plan operatively (at a level of engineering techniques) works on maintenance of readiness of space cryogenic systems at essential economy of expenses for explotation 

Results of an experimental study of the transformation plasticity and shape memory effects in Ti-Ni specimens tested in torsion after preliminary plastic deformation by tension or torsion are presented. It is shown that a plastic deformation by torsion (i. e. of the same type as for the tests on shape memory effect) suppresses the ability of the alloy to accumulate strain in cooling and recover it in heating, while a plastic deformation by tension first (for its small values) enhances and then suppresses the shape memory effect. Numerical modelling of these phenomena based on a microstructural approuch has given similar results 

One and two sections split mufflers are presented. The stand for realizing the model experiments is elaborated. Acoustic and aerodynamic characteristics of different split muffler designs are obtained. It is arcertained that the split mufflers provide the broad-band noise reduction and the insertion of acceptable pressure loss. Splits orientation influence on mufflers' acoustic and aerodynamic characteristics is shown 

The problems of building of averaging time-pulse converters (TPC) for signal processing are discussed in the article. The original classification of the averaging TPCs is made, and the history of their evolution and development is traced back. Enclosed there are schemes of the best designed averaging TPCs. The principle of time separation as a way of further development of the averaging TPCs 

The possible ways of increasing of the urban sawage refinement against organic substances, nitrogen and phosphorus are considered. The estimation are based on the original mathematical model of the biology refinement process in the airtank-secondary settling tank system. This model allows to get values of the exit parameters (expenditures of the back and surplus silt, oxygen concentration) and refinement effect at control parameters changing. The original way of the denitrofication process calculation are used in the model