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The interference of the beams reflected from a combination of two deployed cube-corner reflectors with a special interference phase-shifting coating is considered. It is shown that in this case a beam with an axisymmetric polarization structure appears. Particular attention is paid to the various optical vortices, which are formed if polarization of light is circular. It is proposed to use this system to create a retroreflective interferometer, in which the spatial polarization structure sensitivity changes due to the path difference between the beams, reflected from two different corner-cube reflectors. It is installed such that the position of the plane of vector E oscillations rotates with azimuth variation in the transverse plane, while at different angular distances from the beam axis this rotation can occur in opposite directions, i.e., we observed a counter-twisted polarization structure, useful for manipulating small particles.

The paper presents a brief historical reference of the theory of reinforced concrete structures calculation and its. It shows that modeling of concrete deformations makes it possible not only to carry out calculations of durability and to determine reinforced concrete elements deflection under the estimated load, but also to analyze their a stress-strain state at each stage. The study suggests a new model of concrete deformation which makes it possible to make calculations of concrete elements with characteristics which are different from those given in specification documents. The researchers use the proposed model of deformation and calculate curved reinforced concrete beam bearing capacity. These calculations for normally reinforced elements do not considerably differ from the calculations given in the documents. All the main functional dependencies on the calculation stages are visualized.

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