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Salganik R.L.,Russian Academy of Sciences | Fedotov A.A.,Russian State University of Aviation Technology
19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012 | Year: 2012

Theoretical method of evaluation of concentration of cracks in an elastic porous material using its overall deformability found experimentally for ceramics is considered. The method is based on applying the theoretical dependences of effective elastic modules of an elastic solid with particulate spherical pores and disc-like cracks on their, generally non-dilute, concentrations obtained theoretically with help of the differential scheme. As a result, the parameter of crack concentration, which is the mean cube of crack radius times the crack number per unit volume, is obtained. This parameter is important when considering strength properties of the material under study. Special attention is paid to analysis with help of the aforementioned theoretical method of the recently published results on strength of SiC ceramics analyzed by their authors assuming that only porosity is responsible for the observed strength reduction (as compared to the intact material). Meantime, the analysis performed with help of the above differential scheme has shown that one may expect also the presence in the above ceramics of considerable concentration of cracks commensurable with experimentally investigated pores existing in the ceramics and therefore the role of these cracks should not be ignored, when considering the effect of the porosity on strength of SiC ceramics. The latter is anticipated to be true for other ceramics too. Some prospects of performing the mathematical modeling with application of the differential scheme to analyze the experimental results on strength of ceramics are discussed.

Ryazantseva T.V.,Saratov State Medical University | Kravets L.I.,Joint Institute for Nuclear Research | Elinson V.M.,Russian State University of Aviation Technology
Inorganic Materials: Applied Research | Year: 2012

This paper outlines the experience of using track-etched membranes (TMs) from poly(ethylene terephthalate) with a nanostructured surface as an explantodrainage for the management of refractory glau-coma. To nanostructure the membrane surface layer, the membranes were processed in nonpolymerizing gas plasma. It is shown that the implantation of our explantodrainage allows one to achieve a stable normalization of intraocular pressure and a long-term preservation of the formed pathways for the intraocular fluid outflow. © Pleiades Publishing, Ltd., 2012.

Budkin Y.V.,Russian State University of Aviation Technology
Welding International | Year: 2011

Refractory metals' interaction physical-chemical process features are investigated in electron-beam welding to obtain a qualitative weld in a wide range of welding conditions. Dependence of the welded strength on the presence and thickness of the intermetallide interlayer is established. © 2011 Taylor & Francis.

Anikiev V.V.,Russian Independent Environmental Impact Assessment | Kolesov G.M.,RAS Vernadsky Institute of Geochemistry and Analytical Chemistry | Pavlov A.A.,Russian State University of Aviation Technology
Geochemistry International | Year: 2011

The paper reports monitoring results (obtained in 2000-2001) of the seasonal variations in the quality of lower atmospheric air in the coastal zone of the northern Caspian Sea due to the occurrence of aerosols with submicrometer-sized particles and soot in the lower atmosphere. The contributions of natural and anthropogenic factors to the ecological risk for the local human population are evaluated, along with the contribution of the premature mortality of the human population in the coastal zone in 2005 to its overall average death rate for the Russian Federation (approximately 24%). The authors' estimates are consistent with those made by the World Health Organization at the United Nations (WHO) for the Russian Federation as a whole (approximately 21%). The information presented in this publication is important for evidence-based recommendations on preventive environment-protective measures to be taken with regard for the development of oil and gas fields on- and offshore the northern Caspian Sea. © 2011 Pleiades Publishing, Ltd.

Razintsev V.I.,OAO TsNIIAG | Kulikov S.N.,Russian State University of Aviation Technology | Volkov S.V.,OAO TsNIIAG
Russian Engineering Research | Year: 2013

The use of an upgraded electrohydraulic power amplifier with electric feedback (smart electrohydraulic servovalve) improves the static, dynamic, and energy characteristics of choke-regulated electrohydraulic servo drives and boosts their power efficiency. © 2013 Allerton Press, Inc.

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