Time filter

Source Type

Mariupol, Ukraine

A mathematical model is constructed to describe the coagulation of nonmetallic inclusions and their removal from steel in a large pouring ladle. It is established that the mechanism of flotation by bubbles of inert gas effectively removes only the relatively large inclusions. The feasibility of removing nonmetallic inclusions in steel by treating it with calcium depends on the state of aggregation of the inclusions. In order to efficiently remove calcium aluminates by coagulation and flotation with bubbles of argon or vaporous calcium, the inclusions must be liquid and cannot be covered by a sulfide sheath. © 2010 Springer Science+Business Media, Inc. Source

Mikhail V.,Mariupol State University
Journal of Security and Sustainability Issues | Year: 2013

Mining and metals production sector (MMPS) of Ukraine is one of the basic for the state's economy. The sector's output, as well as the gradual increase in production, gives reason for taking a favorable view of its development prospects. Until the mid-90s MMPS of Ukraine key representatives were separate companies that operated as independent legal entities. However, during 1999-2004 the MMPS enterprises integration into the structure of major private transnational financial industrial groups took place. Large-scale consolidation of major enterprises that occurred in order to adapt to market conditions contributed to the emergence of business combination referred to as holding company. In the future, Ukrainian iron and steel companies' competitiveness in the world market will be largely determined by the scope of their participation in the global consolidation processes. Their future directly depends on the rate of large corporations' formation and restructuring, including changes in the mechanisms of corporate governance. This is one of the most important ways to improve the efficiency of the national iron and steel industry. Source

Kapustin A.,Mariupol State University
Coordination Chemistry Reviews | Year: 2010

Mercarbide [CHg4O2](OH)2, is a mercury derivative of ethane in which all of the ethane hydrogen atoms are substituted by mercury atoms. Mercarbide exhibits basic and anion exchange properties in addition to showing unique stability towards mineral acids as well as oxidizing and reducing agents. The selectivity of mercarbide towards organic anions shows selectivity dependence on the size and configuration of the pendant hydrocarbon group. Titration of mercarbide with Hammett indicators shows that mercarbide in its hydroxide form is a solid base with sites allocation 7.2 < H0 < 26.5. Studies of the catalytic activity of mercarbide towards alcohol oxyethylation and aldol condensation show that it functions as a homogeneous basic catalyst, but with increased activity owing to the higher basicity of its active sites. The present paper reviews the synthesis, structure, physicochemical, and catalytic properties of mercarbide. © 2009 Elsevier B.V. All rights reserved. Source

Styrov V.V.,Berdyansk State Pedagogical University | Simchenko S.V.,Mariupol State University
Journal of Surface Investigation | Year: 2012

The internal emission of hot electrons from a metal (Pd) surface is studied. The electrons gain energy from chemical atomic collisions with the thermal energy hydrogen atoms or with H2 + O2 molecules. A Pd(15 nm)/n-Si(111) nano-Schottky diode is used as a detector of hot electrons in which chemicurrents (and chemo-emf) are generated. The efficiency of entering of chemo-electrons into the external circuit per act of interaction (or per product molecule) is determined. © 2012 Pleiades Publishing, Ltd. Source

Loza A.V.,Mariupol State University
Steel in Translation | Year: 2015

The influence of dummy-bar defects in continuous-casting machines on accidents at the beginning of casting is analyzed. The stress–strain state of the metal at the head of the dummy bar is investigated. It is shown that residual strain in the head may increase the frictional forces between the ingot and the mold wall and may change the rate of heat transfer, which is a possible source of accidents. © 2015, Allerton Press, Inc. Source

Discover hidden collaborations