Samara State Technical University
Samara, Russia

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Samara State Technical University | Date: 2016-09-15

Method for compensating aberrations of an active optical system by a deformable mirror, comprising:

Samara State Technical University | Date: 2017-03-22

The invention relates to a method for compensating aberrations of an active optical system by a deformable mirror (1), comprising:(a) formation of a matrix N, binding the optical system aberrations with the displacements of the surface of a deformable mirror (1), presented as a superposition of natural frequency modes of a mirror simulator (3) having the same geometric shape and the same elasticity characteristics as the deformable mirror (1) but having zero density except for concentrated masses attached at points corresponding to the places of action of force actuators (4) onto the deformable mirror (1);(b) formation of a matrix M, binding the coefficients of the natural frequency modes of the mirror simulator (3) with the forces or displacements of the force actuators (4) that deform the mirror (1);(c) generation of a matrix F of forces or displacements for loading the deformable mirror (1) on the basis of the aberration measurement, using the matrices N and M.

Somov S.,Samara State Technical University
AIP Conference Proceedings | Year: 2017

We consider an information satellite which may be placed on an orbit with altitude from 600 up to 1000 km. We study problems on control of eight electro-reaction engines for a station-keeping of a land-survey satellite on sun-synchronous orbit. © 2017 Author(s).

Somova T.,Samara State Technical University
AIP Conference Proceedings | Year: 2017

We consider problems of synthesis of the vector spline attitude guidance laws for a land-survey satellite and an in-flight support of the satellite attitude control system with the use of computer animation of its motion. We have presented the results on the efficiency of the developed algorithms. © 2017 Author(s).

Volokitin A.I.,Jülich Research Center | Volokitin A.I.,Samara State Technical University | Persson B.N.J.,Jülich Research Center
Physical Review Letters | Year: 2011

We investigate the van der Waals friction between graphene and an amorphous SiO2 substrate. We find that due to this friction the electric current is saturated at a high electric field, in agreement with experiment. The saturation current depends weakly on the temperature, which we attribute to the quantum friction between the graphene carriers and the substrate optical phonons. We calculate also the frictional drag between two graphene sheets caused by van der Waals friction, and find that this drag can induce a voltage high enough to be easily measured experimentally. © 2011 American Physical Society.

An easy-to-use method for quantitative analysis of bacterial exopolysaccharides (EPS) was developed. The acid treatment was resultant in removing proteins and lactose and allowed to avoid long-term operation as dialysis. It was shown that, as opposed to anthron and phenol-sulphuric acid methods, reducing sugars method after EPS hydrolysis with glucose as standard provided reliable results, no matter to the EPS monosaccharide composition. EPS quantity in kefir of different brands was varied greatly, approximately at 50-200 mg/l, showing potential to enhance kefiran production by alteration of technological process. The temperature optimum for EPS production by kefir grains and kefir starter was about 30 °C, while the rise of temperature increased soluble EPS in culturing media by means of extraction from kefir grain body. © 2012 Elsevier Ltd. All rights reserved.

Saifutdinov B.R.,Samara State Technical University
Russian Journal of Physical Chemistry A | Year: 2013

The relationships that associate the equilibrium distribution constant and retention factor in high-performance liquid chromatography are analyzed critically. The K c = kV M/v a + 1 relationship suggested by Yu.A. El'tekov is derived without using the relationship between the Henry adsorption constant and the retention factor. The incorrectness of using another relationship, K c = k/φ, to calculate the distribution constant, which is determined by ignoring the excess character of the retention factor measured experimentally when deriving it, is demonstrated. It is proposed that the retention factor be determined by the ratio of the excess amount of adsorbate in an adsorption layer to the amount of adsorbate in bulk solution. © 2013 Pleiades Publishing, Ltd.

Rapoport E.Ya.,Samara State Technical University
Journal of Computer and Systems Sciences International | Year: 2013

The minimization problem for deviations of the stationary state of a system with distributed parameters from a desired state estimated in the uniform metric is considered. A constructive method for its solution using a successive parameterization of controls and the alternance properties of optimal spatial distributions of the controlled variable is proposed. Examples of the use of the proposed computational scheme of the organization of computational algorithms in optimization problems of stationary thermal conductivity processes are discussed. © 2013 Pleiades Publishing, Ltd.

Shiryaev A.K.,Samara State Technical University
Current Organic Chemistry | Year: 2012

This review is devoted to the design of new salen type ligands and its applications in the asymmetric catalysis. The main achievements in this field include development of recyclable catalysts, investigation of the mechanism of the secondary alcohols oxidative resolution and the asymmetric Henry reaction, and a study of the synthetic advantages of the salen complex catalysis. The aim of this review is to present an overview of the literature on the recent progress in the salen ligand catalytic chemistry. © 2012 Bentham Science Publishers.

Somov S.,Samara State Technical University
AIP Conference Proceedings | Year: 2012

Problems of nonlinear modeling, dynamic analysis and simulation of spatial motion by a spacecraft with a flexible weak damping structure, are considered. Attitude motion of a flexible spacecraft with pulse-width control, spin-up rotors of six single-gimbal control moment gyros (CMGs) at the initial, service and emergency modes, is studied. Results on analysis of the spacecraft nutation and flexible oscillations, are represented. © 2012 American Institute of Physics.

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