Army Academy Named After Hetman Petro Sahaydachnyi

L'viv, Ukraine

Army Academy Named After Hetman Petro Sahaydachnyi

L'viv, Ukraine

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Ozga K.,Czestochowa University of Technology | Wojciechowski A.,Czestochowa University of Technology | Nabialek M.,Czestochowa University of Technology | Szota M.,Czestochowa University of Technology | And 4 more authors.
Optical and Quantum Electronics | Year: 2015

We have done the studies of the photoinduced absorption and of the related second harmonic generation (SHG) for the (Formula presented.) (where Me=Cu, Mn). We have found substantial changes of the absorption under influence of the continuous wave lasers. The changes of the photoinduced optical SHG were stimulated by the two bicolour laser coherent beams. The results presented show that for the nanosecond 1,064 nm Nd:YAG laser beam principal changes were observed for the Cu-containing samples. The diethyl ammonium samples doped by Mn and Cu have shown substantially higher photo induced SHG up to the other samples. Simultaneously we have studied the pump-probe and size dependences. However for all the cases principal role was played by the octahedral MeCl6. Relation with the trapping levels actively interaction with phonon modes is principal here. © 2014, Springer Science+Business Media New York.


Zubkov A.,Army Academy named after Hetman Petro Sahaydachnyi | Prudyus I.,Lviv Polytechnic | Diakov A.,Army Academy named after Hetman Petro Sahaydachnyi | Mymrikov D.,Lviv Polytechnic
Modern Problems of Radio Engineering, Telecommunications and Computer Science - Proceedings of the 10th International Conference, TCSET'2010 | Year: 2010

Methodology for structural-functional construction of multispectral radio monitoring system by the criterion of information efficiency is proposed. Requirements to the main elements of the structure are determined.


Kuntyi O.,Lviv Polytechnic | Kuntyi O.,Army Academy Named after Hetman Petro Sahaydachnyi | Okhremchuk Y.,Lviv Polytechnic | Bilan' O.,Lviv Polytechnic | And 2 more authors.
Central European Journal of Chemistry | Year: 2013

The morphology of silver particles deposited on ITO-glass surface by pulse electrolysis in acetonitrile solutions of AgNO3 has been analyzed. The influences of potential value (E) as well pulse duration (τon) and pause (τoff) on the size and geometry of the particles has been discussed. It has been shown that in the range of 0.0 ≤ E ≤ -1.5 V at τon = 6 ms and 90 ≤ τoff ≤ 490 ms formation of silver particles (∼20-50 nm) and their agglomeration (∼0.2-2 μm) take place. The tendency to increase size of the particles in 3D has been observed with the increase of cathode potential. Decreasing of duty cycle leads to more discrete deposited particles. © 2013 Versita Warsaw and Springer-Verlag Wien.


Ozga K.,Czestochowa University of Technology | Lakshminarayana G.,Los Alamos National Laboratory | Szota M.,Czestochowa University of Technology | Nabialek M.,ugosh University Czestochowa | And 6 more authors.
Optical and Quantum Electronics | Year: 2013

The occurrence of linear electrooptics and optical anisotropy is observed in the ferroic crystals [ NH2(C2H5) 2]2CuCl4 embedded into polymethylmethacrylate polymer matrix. The studies were performed for the optically treated bulk crystals and the large-size nanocrystals (with sizes higher than 50 nm) embedded into the polymer matrix. The specimens were both in a form of bulk as well as in the form of the composite films. To understand the mechanisms giving the principal role to the effect we have performed polarized absorption measurements for the samples treated in the external dc-electric field and bicolour 532 nm/1,064 nm laser treatments. The behaviour of the birefringence and of the linear electrooptics coefficients were studied within a temperature range covering the incommensurate phase existence. © 2013 Springer Science+Business Media New York.


Ozga K.,Czestochowa University of Technology | Lakshminarayana G.,Los Alamos National Laboratory | Dospial M.,Czestochowa University of Technology | Tkaczyk S.,ugosh University Czestochowa | Fedorchuk A.O.,Army Academy Named after Hetman Petro Sahaydachnyi
Journal of Materials Science: Materials in Electronics | Year: 2013

The complex studies of optically induced piezooptics and second harmonic generation (SHG) are performed for the [NH2(C2H 5)2]2CuxCo1-xCl 4 nanocomposites in a form of films and bulks. The corresponding nanoparticles (NP) were embedded into different polymer matrices with content of NP varying from 1 % up to 9 % in weight units. The changes of the photoinduced optical SHG were caused by simultaneous illumination of two bicolour coherent laser beams and simultaneously applied dc-electric field at different temperatures, above glass transition temperature. The fundamental 1,064 nm Nd: YAG laser duration was equal to 12 ns. A comparison of the same features with the analogous crystals doped with Fe2+ was carried out. The samples doped by Fe3+ ions have shown substantially less photo induced SHG up to one order. The time kinetics of the photoinduced changes after the switching off the external laser fields was studied. Temperature dependences of the piezooptics and the SHG near the incommensurate phase existence were explored. © 2013 Springer Science+Business Media New York.


Kuntyi O.,Lviv Polytechnic | Kuntyi O.,Army Academy named after Hetman Petro Sahaydachnyi | Dobrovetska O.,Lviv Polytechnic | Korniy S.,Karpenko Physical Mechanical Institute of the NAS of Ukraine | And 2 more authors.
Chemistry and Chemical Technology | Year: 2014

Palladium deposition on rotational magnesium disk and magnesium powder via cementation has been investigated in 0.01 M PdCl2 solutions in dimethylformamide. The reduction process started from 323-333 K without the induction period. Spheroidal microparticles of palladium and its agglomerates were found to be formed on the magnesium disk surface. Particles in the form of needles and plates by the width of 80-120 nm were formed on the surface of magnesium powder. The deposited particles are characterized by high adhesion to the substrate surface. © Kuntyi O., Dobrovetska O., Korniy S., Zozulya G., Mykhalyna G., 2014.


Sviridova T.,Lviv Polytechnic | Sviridova L.,Army Academy Named after Hetman Petro Sahaydachnyi | Tymoshenko B.,Lviv Polytechnic
2011 Proceedings of 7th International Conference on Perspective Technologies and Methods in MEMS Design, MEMSTECH 2011 | Year: 2011

In this paper devoted to using of Google applications in communication process between teacher and students during semester. Overview of Google services is presented. Also Google site as example is created © 2011 LVIV POLYTECHNIC NATL UNIV.


Romaka V.V.,Lviv Polytechnic | Romaka V.V.,University of Vienna | Romaka L.,Ivan Franko National University of Lviv | Rogl P.,University of Vienna | And 6 more authors.
Journal of Alloys and Compounds | Year: 2014

The phase equilibria in the Zr-Co-Sb ternary system were studied at 873 K by means of X-ray and metallographic analyses in the whole concentration range. The interaction between the elements results the formation of four ternary compounds at investigated temperature: ZrCoSb (MgAgAs-type), Zr 6CoSb2 (K2UF6-type), Zr 5CoSb3 (Hf5CuSn3-type) and Zr 5Co0.5Sb2.5 (W5Si3-type). The limited composition Zr5CoSb3 of the solid solution based on the Zr5Sb3-4 binaries is considered as compound with Hf5CuSn3 structure type. The influence of the disordering and defects in the crystal structure of ZrCoSb on the physical properties was analyzed. The performed electronic structure calculations are in good agreement with electrical and magnetic studies. © 2013 Elsevier B.V. All rights reserved.


Stakhira Y.M.,Ivan Franko National University of Lviv | Tovstyuk N.K.,Ivan Franko National University of Lviv | Fomenko V.L.,Ivan Franko National University of Lviv | Grigorchak I.I.,Lviv Polytechnic | And 2 more authors.
Low Temperature Physics | Year: 2012

A solid-phase mechanochemical technology of production of polycrystalline InSe intercalated with Ni up to 1.25 at. % has been developed. The x-ray and phase analyses of the produced NixInSe samples confirm their homogeneity and demonstrate a nonmonotonic Ni-content dependence of the lattice constant along the axis normal to the layers. Analysis of the low-temperature (77 K) impedance response within the frequency region 10 -3-10 6 Hz shows a good correlation between the change in interlayer distance and in the band conductivity observed with increasing Ni concentration. However, the Ni concentration dependence of specific magnetization demonstrates an irregular increase at x ~ 1 and does not coincide with the former. Such behavior is explained by the proposed theoretical model, which at the same time unveiled the mechanism behind the increasing contribution of free carrier concentration to conductivity - hybridization of electron orbitals of guest nickel and the lattice layers. © 2012 American Institute of Physics.


Prudyus I.,Lviv Polytechnic | Lazko L.,Lviv Polytechnic | Mymrikov D.,Lviv Polytechnic | Zubkov A.,Army Academy Named after Hetman Petro Sahaydachnyi
2014 20th International Conference on Microwaves, Radar and Wireless Communications, MIKON 2014 | Year: 2014

The design methodology of active - passive integrated systems which are based on integrated beamforming electro-dynamical structure as well as image processing in such systems are considered in this paper. © 2014 Warsaw University of Technology (WUT).

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