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Savchyn P.V.,Ivan Franko National University of Lviv | Vistovskyy V.V.,Ivan Franko National University of Lviv | Pushak A.S.,Ukrainian Academy of Printing | Voloshinovskii A.S.,Ivan Franko National University of Lviv | And 4 more authors.
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2012

LaCl 3:Eu 2+ microcrystals dispersed in the NaCl matrix have been obtained in the NaCl-LaCl 3(1 mol.%)-EuCl 3(0.1 mol.%) crystalline system. The low-temperature luminescent properties of these microcrystals have been studied upon the VUV and UV excitation by the synchrotron radiation. The spectroscopic parameters as well as decay time constants of Eu 2+-doped LaCl 3 host have been established. The excitation mechanism of divalent europium centers through energy transfer and reabsorption is discussed. © 2011 Elsevier B.V. All rights reserved. Source


Pushak A.S.,Ukrainian Academy of Printing | Savchyn P.V.,Ivan Franko National University of Lviv | Vistovskyy V.V.,Ivan Franko National University of Lviv | Demkiv T.M.,Ivan Franko National University of Lviv | And 3 more authors.
Journal of Luminescence | Year: 2013

BaCl2:Eu2+ microcrystals embedded in the NaCl host have been obtained in the NaCl-BaCl2(1 mol%)-EuCl3(0.02 mol%) crystalline system. The influence of the annealing conditions on the formation of such particles has been studied. In particular, long-term annealing (at 200°s during 100 h) promotes the microcrystals formation in the NaCl-BaCl2-Eu crystalline system. The subsequent heat treatment (annealed at 600°s during 72 h and quenched to room temperature) is shown to lead to the destruction of the majority of these particles. The luminescent-kinetic properties of BaCl2:Eu2+ microcrystals have been studied upon the ultra-violet excitation by the synchrotron radiation. The X-ray excited luminescence has been measured in order to estimate the distribution of europium ions between microcrystals and the NaCl host. The excitation mechanisms of Eu2+ ions in the NaCl-BaCl2-Eu crystalline system are discussed. © 2012 Elsevier B.V. Source


Hembara N.O.,Ukrainian Academy of Printing
Materials Science | Year: 2014

We propose a computational model of the distribution of temperature in a round plate with bilateral multilayer coatings. The solution of the problem of heat-conduction for plates with coatings and the regularities of variation of temperature across the thickness and along the radius are obtained. The influence of a two-layer coating on the thermoelastic state of a solid gas-turbine disk is established. It is shown that if we neglect the thermal characteristics of the coating, then we get overestimated values of temperature and underestimated values of thermal stresses. © 2014 Springer Science+Business Media New York. Source


Melnikov A.V.,Ukrainian Academy of Printing | Semenyuk E.P.,National Forest Engineering University of Ukraine
Scientific and Technical Information Processing | Year: 2014

The progress of humanity has long been impossible without the development of quality printing production: the book is universally known to be an essential attribute of worldwide civilization. Over the recent decades, the most important feature of the scientific and technological revolution has become its informational aspect, and this produces multiple effects on the changing nature of modern printing. The latest information technologies have significantly replenished the arsenal of traditional printing production and form the basis of the current use of printing equipment. © 2014 Allerton Press, Inc. Source


Korostil Y.,Ukrainian Academy of Printing | Korostil O.,Maritime University Of Szczecin
Journal of Konbin | Year: 2015

This paper contains developing of a method of solving diagnostic tasks for complex technical objects (STO) based on using text models (TMi) to describe the functioning of STO. A TMi model is a text description, in normalized form, of all fragments of STO functioning process. The description of TMi is for med using semantic vocabularies of different types, which are generated on the basis of usage of information about all the aspects of STO construction and functioning. Such interpretation description is a subject area for tasks of STO diagnostics. Detection of malfunction and deviations of a functioning process of STO from an established functioning mode is implemented on the basis of analysis of semantic parameters of text description of the STO functioning process in order to determine semantic anomalies which occur in the descriptions of the STO functioning process, as well as in the descriptions of fragments of its functioning. Semantic anomalies occur in case when values of semantic parameters go beyond their established limits. Source

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