Friction and wear of fuel assemblies in water-moderated reactors

Static and dynamic processes that involve frictional forces are experimentally studied. The frictional forces affect the stress of the fuel assembly in all stages of the life cycle.     

Generalized Catalan numbers in problems of processing of random discrete images

The notion of the Catalan numerical sequence is extended. Problems leading to generalized Catalan numbers are formulated and solved.     

Secondary diffraction of diffracted Gaussian beam of laser radiation

The diffraction of a narrow Gaussian beam of laser radiation on mutually perpendicular edges of crossed, superimposed sharp wedge-shaped blades (safety razors) has been studied. The diffraction pattern observed on a flat screen behind the blades comprises a very bright central spot, which exhibits the structure of a “light network” with rectangular cells, and four groups of narrow bright bands that expand from the central spot toward the periphery and form a rectangular cross. The spatial frequency of light-field modulation on the screen can be controlled by varying the distance from the blades to screen.     

Various methods for the deoxidation of a Cr-Ni-Mo-V steel during out-of-furnace treatment and their effect on the formation of nonmetallic inclusions

The effect of various methods of deoxidation during out-of-furnace treatment on the content and composition of nonmetallic inclusions in 15Kh2NMFA steel measured after out-of-furnace treatment and in forged pieces made from large ingots of this steel is studied.     

High-precision radiometer of infrared radiation

Microprocessor radiometer with two-channel diaphragmatic optical system for high-precision measurements in infrared wave band (2–25 μm) is designed. The radiometer allows for measuring the surface temperature in 10–500°C range with maximum error not exceeding 0.5% and ensures viewing angle of 1:50. Certain results of using the radiometer in biomedical research are provided.     

Residual protective effect of <Emphasis Type=Italic>o</Emphasis>-oxyazomethine derivatives against iron corrosion in 1 M H<Subscript>2</Subscript>SO<Subscript>4</Subscript> solution

The residual protective effect of n-component mixtures of o-oxyazomethine derivatives at the corrosion of iron in 1 M H₂SO₄ decreases with time and an increase in temperature of the environment and increases with an increase in the polarity of substituent groups in the molecules and the inhibitor concentration in the solution. These regularities are interpreted based on the principle of the linear free-energy relation.     

Properties of multilayer ZnO:Ga/Ag/ZnO:Ga coatings applied by magnetron sputtering

The methods of van der Pau, spectrometry, and atomic force microscopy were used to study the optical and electrophysical properties of multilayer ZnO:Ga/Ag/ZnO:Ga coatings applied by magnetron sputtering. The effect of the thickness of the coating layer was studied with respect to the surface resistance, transparency, and reflection of the multilayer structure in the visible and infrared wavelength ranges. The coating surface morphology and moisture resistance was studied. The ZnO:Ga/Ag/ZnO:Ga coatings were shown to have a high transparency (T = 90%) in the visible range, high reflection coefficient in the IR range (R = 93%), and low surface resistance (R_s = 4.88 Ohm/sq). The moisture resistance studies showed the highest moisture resistance of ZnO:Ga (25 nm) / Ag (15 nm) / ZnO:Ga (75 nm) coatings, which are not changed by testing and can be used for the effective protection of silver films against degradation.     

A speckle-interferometric setup for contactless measurements of the velocity of rayleigh ultrasonic waves

The velocity of a Rayleigh wave was determined by measuring its propagation time between two Iaser-illuminated small areas of a rough surface. It is sh own that, if a Rayleigh wave passes over these areas, a photodiode twice detects signals proportional to the surface displacement in the speckle overlap region. In contrast to the previous variant, signal-distorting reflections are eliminated in the instrument. A sample holder excluding adjustment of the interferometer upon a change in the object size has been manufactured. A new technique for determining the time interval between two signals is used. The instrument operates at a frequency of 5 MHz, and the distance between the areas is adjusted in the range 5–100 mm. The rms deviation of the velocity from the average value for ten measurements is 8 × 10–4.