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Sukhomlin K.B.,Lesya Ukrainka Eastern European National University
Vestnik Zoologii | Year: 2012

Phylogenetic relationships among the Palaearctic genera of the subfamily Simuliinae are analyzed based on the matrix of 100 morphological characters and 37 taxa, including 6 outgroups. Parsimonic analysis was resulted in 3 consensus trees (weighting based on CI, RI and RC indices) of slightly different topology, which show monophyly of the subfamily Simuliinae, tribes Stegopternini, Nevermanniini, Wilhelmiini and Simuliini, and a possible sister-group relationships between the latter two tribes. Tribe Ectemniini is apparently a paraphyletic formation. The analysis also supports transferring of the Stegopternini and Nevermanniini from Prosimuliinae to Simuliinae.

Grubiy A.M.,Lesya Ukrainka Eastern European National University
Cybernetics and Systems Analysis | Year: 2012

Algorithms for producing a Collatz sequence are considered in the cases of the binary and ternary number systems. Advantages of this approach to the representation of such a sequence are considered. Logic circuits of iterative automata that implement the algorithms described are presented. © 2012 Springer Science+Business Media, Inc.

Tarasova A.Yu.,RAS Institute of Geology and Mineralogy | Isaenko L.I.,RAS Institute of Geology and Mineralogy | Kesler V.G.,RAS Semiconductor Physics Institute | Pashkov V.M.,RAS Institute of Geology and Mineralogy | And 3 more authors.
Journal of Physics and Chemistry of Solids | Year: 2012

X-ray photoelectron core-level and valence-band spectra for pristine and Ar-ion irradiated (001) surfaces of KPb 2Br 5, K 0.5Rb 0.5Pb 2Br 5, and RbPb 2Br 5 single crystals grown by the Bridgman method have been measured and fundamental absorption edges of the ternary bromides have been recorded in the polarized light at 300 K and 80 K. The present X-ray photoelectron spectroscopy (XPS) results reveal high chemical stability of (001) surfaces of K xRb 1-xPb 2Br 5 (x=0, 0.5, and 1.0) single crystals. Substitution of potassium for rubidium in K xRb 1-xPb 2Br 5 does not cause any changes of binding energy values and shapes of the XPS constituent element core-level spectra. Measurements of the fundamental absorption edges indicate that band gap energy, E g, increases by about 0.14 and 0.19 eV when temperature decreases from 300 K to 80 K in KPb 2Br 5 and RbPb 2Br 5, respectively. Furthermore, there is no dependence of the E g value for KPb 2Br 5 upon the light polarization, whilst the band gap energy value for RbPb 2Br 5 is bigger by 0.030.05 eV in the case of E||c compared to those in the cases of E||a and E||b. © 2012 Elsevier Ltd. All rights reserved.

Lishchuk N.V.,Lesya Ukrainka Eastern European National University
Journal of Automation and Information Sciences | Year: 2015

It is shown that for the set covering problems (which differ in one position of the constraint matrix) there are not κ-probabilistic polynomial procedures for the analysis of the stability (Κ ∈ {ZPP, RP}) for Κ ≠ NP.

Daszkiewicz M.,Institute of Low Temperature And Structure Research | Gulay L.D.,Lesya Ukrainka Eastern European National University
Materials Research Bulletin | Year: 2012

The compounds with the general formula Ln 3MTX 7 (space group P6 3) (Ln - rare-earth element, M - monovalent element (Cu, Ag), T - Si, Ge, Sn and X - S, Se) are interesting owing to the possible application in the field of ionic conductivity. In the crystal structure the face-sharing [Ag(S) 6] triangular antiprisms form the channels where the Ag + ion can migrate along the crystallographic c axis. High-pressure X-ray diffraction shows that Ag + ion moves towards the central-point of [Ag(S) 6] when pressure is risen. As a consequence, the coordination number of Ag + changes from CN = 3 to CN = 6 at ∼3 GPa. The La 3Ag 0.82SnS 7 has stiff structure; zero-pressure bulk modulus is B 0 = 61.74 GPa and the pressure derivative is B' 0=4.02. © 2011 Elsevier Ltd. All rights reserved.

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