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Kiev, Ukraine

Meshaninov S.K.,DSTU | Spivak V.M.,NTUU KPI
Modern Problems of Radio Engineering, Telecommunications and Computer Science, Proceedings of the 13th International Conference on TCSET 2016 | Year: 2016

There are presented results of analytical researches of reliability and efficiency of the using of apparatus for biophysical researches as a difficult technical system. Considered the classification factors, qualificatory efficiency of functioning of apparatus for biophysical researches. Create the conclusion that the combined service is optimal, here as an evaluation criterion the criterion of a minimum of risk is chosen. © 2016 National University Lviv Polytechnic.

Trubina S.,NTUU KPI
Modern Problems of Radio Engineering, Telecommunications and Computer Science - Proceedings of the 10th International Conference, TCSET'2010 | Year: 2010

The article presents possible ways of achievieng international coordination for the Ukrainian satellite "Lybid".

Mudriievskyi S.,TU Dresden | Tsokalo I.,NTUU KPI | Haidine A.,KEMA Consulting GmbH | Adebisi B.,Lancaster University | Lehnert R.,TU Dresden
2011 IEEE International Conference on Smart Grid Communications, SmartGridComm 2011 | Year: 2011

This paper investigates the backoff algorithm for Narrowband Power Line Communications (PLC) Medium Access Control (MAC) protocol. Specifically, the paper considered the MAC designed by Yitran and implemented within its Differential Code Shift Keying (DCSK) technology. In this algorithm width of the contention window is calculated based on the estimated number of active nodes in the network. Further the performance of the algorithms were evaluated under different saturated throughput conditions and varying number of active nodes, in a fully meshed network. Comparison were also made between the simulated and the polynomial backoff algorithm's dynamic characteristics. Simulation results show that the algorithm under investigation has an excellent performance under the saturated throughput, although its dynamic characteristic can be further improved. © 2011 IEEE.

Tsibriy I.,NTUU KPI | Grabovskiy H.,GNPK KIA
Metallurgical and Mining Industry | Year: 2015

The model of titanium liquid melt heating in the intermediate container of electron-beam furnace is developed considering its flow. On the basis of the developed mathematical model, a series of numerical experiments was conducted using finite-element method and finite-difference method. The analysis of model parameters effect on the melt temperature field formation was carried out. These researches results may be useful for the further development of electron-beam guns control algorithms. © 2015. Metallurgical and Mining Industry.

Manulyk A.,Owens-Illinois | Mykhalenkov K.,NTUU KPI
Materials Science and Technology Conference and Exhibition 2013, MS and T 2013 | Year: 2014

The erosion, corrosion, and oxidation-resistance properties of TiAlSiCN and TiCrSiCN coatings depend directly on the microstructure and uniformity of composition in the coating body. Where the Key material parameters that influence the emergence of a protective silica oxygen diffusion barrier in these materials under high temperature, oxidizing conditions include: the composition, crystallographic structure, size, size distribution, and spatial uniformity of discrete phases distributed throughout the resulting cermet. There is a difference in TiAlSiCN and TiCrSiCN microstructure. TiCrSiCN contains a higher ceramic - to-metallic phase ratio: i.e. it is more "ceramic" by nature. Based on preliminary characterization of the scale layers in these two series of materials, we believe that here are two possible mechanisms for oxide scale formation high temperature: (1) simultaneous emergence of competing stable oxides, including silica, with silica rapidly forming the dominant, continuous protective phase over time and (2) the initial nucleation and growth of network of stable and complex local oxide phases across the exposed cermet surface, each of which reduces the rate of oxygen diffusion in varying degrees over the material and upon eventual impingement react or thermally mix with one another to form final complex scale layer. Copyright © 2013 MS&T'13®.

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