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Angelsky O., Bogatyryova H, Polyanskii P. Interference coloring of regularly scattered white light

Saturday, 23 July 2011 16:44 administrator
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Interference coloring of the regular component of a polychromatic light scattered by a colorless dielectric slab with a rough surface is considered. To explain the observed alternation of colors as the depth of roughness grows, we apply the model of a transient layer associated with surface roughness, which extends the well-known analogy between the layer and a light-scattering particle. It is shown that coloring of the forward-scattered component of a white light can be interpreted as the action of a peculiar quarter-wavelength (anti-reflecting) layer for some spectral component of a polychromatic probing beam. By applying the modern chromascopic technique, we compare the coloring of the forward-scattered and the specularly reflected radiation. As the demonstration, the effect of “a blue Moon” and “a red Moon” caused by the spectral changes induced by white-light scattering at the rough surface of a colorless glass is represented. — Natura simplex et fecunda, A. Fresnel.

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Last Updated on Saturday, 23 July 2011 16:46
 

Antonyuk V.S. Preparation Of Wear-Resistant Antifriction Composite Coatings Reinforced With Ultradispersed Diamond

Sunday, 13 November 2011 20:12 administrator
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V.S. Antonyuk. Preparation Of Wear-Resistant Antifriction Composite Coatings Reinforced With Ultradispersed Diamond. – Journal of Superhard Materials. Vol. 40, No 4. pp. 66-69, 1998

This paper deals with the formation of wear-resistant antifriction coatings on components of friction couples. We suggest a new antifriction composite material containing nonferrous intermetallic compounds reinforced with explosion-synthesized ultradispersed  diamond, to be used for coating friction surfaces. We report the experimental results and by the example of sleeves of internal combustion engines we show the effieiency of using this material as a function coating for friction couples.

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Antonyuk V.S., Lyashenko B. A., Soroka E. B., Rutkovskiy A. V. Tools, Powders, Pastes On The Reduction Of Residual Stresses In Vacuum-Plasma-Sprayed Discrete-Structured Coatings

Sunday, 13 November 2011 20:04 administrator
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V. S. Antonyuk, B. A. Lyashenko, E. B. Soroka, A. V. Rutkovskiy. Tools, Powders, Pastes On The Reduction Of Residual Stresses In Vacuum-Plasma-Sprayed Discrete-Structured Coatings. - Journal of Superhard Materials, Vol. 27, No. 2, pp. 68-71, 2005

The paper discusses residual stresses in vacuum-plasma-sprayed titanium nitride coatings. It is shown that replacing of continuous coatings with discrete-structured ones reduces residual stresses in them. A decrease in residual stresses depends on the size of a discrete segment: the smaller the segment, the greater this dependence. The approach proposed makes it possible to limit residual stresses in a coating while maintaining its continuity, and to reduce the probability of its contact fracture.

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Antonyuk V.S., Soroka E.B., and Kalinichenko V.I. Providing Adhesion Strength for a Substrate-Coating System under Contact Loading

Saturday, 12 November 2011 15:16 administrator
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V. S. Antonyuk, E. B. Soroka, and V. I. Kalinichenko. Providing Adhesion Strength for a Substrate-Coating System under Contact Loading. – Journal of Superhard Materials. Vol. 30, No 2. pp. 133-138, 2008

The use of graded coatings, with elastic moduli decreasing gradually from the contact surface to the substrate, is shown to result in considerably reduced stresses at the coating—substrate interface under indentation and friction and sliding contacts subjected to surface loading.
When solving a contact problem, the researchers have demonstrated that the stress distribution pattern, including stresses at the substrate—coating interface, as well as the coating thickness parameters and elastic characteristics depend on the contact plane and relative surface area of the loading zones.The case under study here differs fundamentally from those discussed in the available publications, not so much in considering a coated tool as in the fact that the contact discontinuity depends also on the dimensions of the discrete coating segment. This requires taking up and considering a problem of contact loading of a discrete coating segment on a tool.The objective of the present work is to minimize stresses in the substrate—coating adhesive contact under contact loading with friction.

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Babchenko O. Quality Control Method For Powder Melted Tool Plates

Saturday, 12 November 2011 14:38 administrator
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Oleksandr Babchenko. Quality Control Method For Powder Melted Tool Plates. – XIII International PhD Workshop OWD 2011, 22-25 October 2011. 421-423pp.

Production of powder metallurgy is highly dependent on the quality of sintering powder parts, which is characterized by relative density sintering. That is why, quality control? witch based on acoustic sound can determined that the relative density of sintering.. Last years, much attention was paid to determining the relative density of powder melted parts. The connection characteristics of composite materials parts is achieved by extensive using the methods of nondestructive quality control.

For realization a control method for composite materials was proposed new solution based on the using the acoustic signals.

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Last Updated on Friday, 24 October 2014 10:03
 

Bezvesilnaya E., Podchashinsky Y., Dobrozhansky A. Requirements for airborne gravimetry system

Monday, 22 August 2011 08:40 administrator
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In the article the requirements to system for airborne gravimetry are formulated. A system for airborne gravimetry must consist of five functional subsystems for 1) specific force measurement, 2) geometric stabilization, 3) terrestrial navigation, 4) altimetry, and 5) computation. The general error of measurements of gravitational anomalies does not exceed 10 mgal. The accuracy requirement to main bodies of the block diagram of system for airborne gravimetry are determined based on analysis of errors of measurements.

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Bezvesilnaya E., Podchashinsky Y., Korobyjchuk I. Gravimeter with two-dimension digital processing of measuring information

Monday, 22 August 2011 08:52 administrator
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Gravimeter with two-dimensional digital data processing about acceleration of gravity is considered in a paper. The result of measurements in gyroscopic gravimeter contains errors. An influence on gravimeter inertial absolute acceleration and other disturbing influences cause the errors of measurements. These of acceleration arise by work gravimeter onboard the plane in structure of air gravimetric system. The structural scheme of gyroscopic gravimeter is proposed in a paper for multiple precision. This construction is providing immediate measurements of acceleration of gravity. The possibility of digital data processing is considered in view of a two-dimensional character of an array of measuring information.

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Last Updated on Monday, 22 August 2011 08:55
 

Bogatyryova G., Fel’de Ch., Polyanskii P. Referenceless testing of vortex optical beams

Saturday, 23 July 2011 20:31 administrator
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A new simple technique for determining the phase handedness (clockwise or counterclockwise) of vortex optical beams, which does not require implementation of an interferometric arrangement, is introduced. It is shown that both the phase handedness and the modulus of an azimuthal mode index of the beam can be directly and unambiguously determined on the basis of bending of interference fringes in a “strip” Young’s interference experiment. The initial results are obtained by simulation, partially demonstrated and discussed. Applicability of the proposed technique to
testing elementary and complex vortex-bearing optical beams and fields is discussed.

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Bogatyryova G., Fel’de Ch., Polyanskii P., Ponomarenko S., Soskin M., Wolf E. Partially coherent vortex beams with a separable phase

Saturday, 23 July 2011 16:39 administrator
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We propose and experimentally implement a method for the generation of a wide class of partially spatially coherent vortex beams whose cross-spectral density has a separable functional form in polar coordinates. We study phase singularities of the spectral degree of coherence of the new beams.

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Bogatyryova H., Felde Ch., Polyanskii P., Soskin M. Polarization structure of combined vortex beams

Saturday, 23 July 2011 20:49 administrator
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Nongeneric polarization structures of the vortex beams resulting from coherent coaxial mixing of orthogonally polarized one-charged Laguerre-Gaussian modes with different mode numbers are analyzed. General solutior is derived for a superposition of elliptically orthogonally polarized partial vortex beams, and the limiting partial cases when the mixed modes are polarized linearly or circularly are explored both theoretically and experimentally. It is established that in such combined beams unusual spatially stable polarization stmctures arise, such as closed C — contours and L — contours with a constant azimuth of linear polarization.
Keywords: singular optics, vortex beams, polarization singularities, nongeneric structures

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