L'viv, Ukraine
L'viv, Ukraine

Lviv Polytechnic National University is the largest scientific university in Lviv. Since its foundation in 1844, it was one of the most important centres of science and technological development in Central Europe. In the interbellum period, the Polytechnic was one of the most important technical colleges in Poland, together with the Warsaw Polytechnic. Today the University is also the National Defense University . Wikipedia.

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Tymoshchuk P.V.,Lviv Polytechnic
2011 11th International Conference - The Experience of Designing and Application of CAD Systems in Microelectronics, CADSM 2011 | Year: 2011

A simplified continuous-time mathematical model of K-winners-take-all (KWTA) neural circuit described by state equation with discontinuous right-hand side and output equation is presented. There is given a functional block diagram of the circuit composed for N inputs of N feedforward and one feedback hardlimiting neurons used to determine the dynamic shift of inputs. The circuit can process any finite value distinct signals with any specified minimal speed that is controlled by its single parameter, it does not require resetting with corresponding supervisory circuit and possesses signal ordering preserving property. Simulation results demonstrate good performance of the model. © 2011 Lviv Polytechnic National.

News Article | November 10, 2016
Site: www.sciencedaily.com

Climate change is one of the most pressing concerns of the 21st century. But when it comes to tackling climate change, a new study from Cogent Economics & Finance exploring the benefits of carbon flux monitoring is a timely reminder that setting targets is just the beginning. Now that the Paris Agreement has decreased the level of carbon emissions deemed acceptable, the need for a decarbonised energy sector is greater than ever. Although technology exists to monitor actual carbon fluxes globally, the systems currently used to do it are expensive at a time when public financial resources are stretched. In pursuit of this, clean technologies must be supported while fossil fuels are penalised, yet uncertainty in the price of carbon makes it difficult to set caps and impose financial penalties. It also makes it challenging to create a stable, socially desirable investment environment that fosters carbon-neutral technologies. To that end, this article investigates the many ways in which better observation of actual carbon fluxes can aid environmental policy, economic investment and informed decision-making. The study found that better monitoring systems could bring significant cost savings and other benefits, thereby encouraging investors and paving the way for achieving ambitious climate change targets. The study is the result of a collaboration of researchers from several institutes, namely the International Institute for Systems Analysis, the Mercator Research Institute on Global Commons and Climate Change, The Inversion Lab, Lund University, Fondazione Eni Enrico Mattei, Comenius University, Lviv Polytechnic National University, the Euro-Mediterranean Center on Climate Change (CMCC Foundation) and the Max-Planck-Institute for Biogeochemistry. The authors come from a variety of academic backgrounds, exploring topics in economics, mathematics, remote sensing, forestry, physics, biogeochemistry, integrated assessment of climate change and climate change mitigation.

Laba H.P.,Lviv Polytechnic | Tkachuk V.M.,Ivan Franko National University of Lviv
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2014

We study an analog of the equations describing transverse electric (TE) and transverse magnetic (TM) modes in a planar waveguide with an arbitrary continuous dependence of the electric permittivity and magnetic permeability on coordinates with the stationary Schrödinger equation. The effective potential energies involved in the Schrödinger equation for TE and TM modes are found. In general, the effective potential energies for TE and TM modes are different but in the limit of a weak dependence of the permittivity and permeability on coordinates they coincide. In the case when the product of a position-dependent permittivity and permeability is constant, it means that the refractive index is constant, and we find that the TE and TM modes are described by the supersymmetric quantum mechanics. © 2014 American Physical Society.

Zayachuk D.M.,Lviv Polytechnic
Journal of Magnetism and Magnetic Materials | Year: 2010

Peculiarities of applying the Curie-Weiss law to the analysis of the magnetic susceptibility of the impurities of the rare earth elements in the IV-VI crystals are examined. It is shown that the traditional approach to the determination of the paramagnetic Curie temperature of ferromagnets and antiferromagnets applied to the impurities of ferromagnetic and antiferromagnetic elements in the doped crystal may lead to fundamental mistakes. The results of this examination are used to analyze the high temperature magnetic susceptibility of Eu and Gd impurities in the PbTe doped crystals grown from the melt using the Bridgman method. It is established that the doping of PbTe with Eu leads to the formation of ferromagnetic inclusions and the same doping with Gd leads to the formation of antiferromagnetic inclusions in the crystal. It is shown that these inclusions are most likely the complexes based on the europium or gadolinium oxides EuO and Gd2O3, respectively. © 2009 Elsevier B.V. All rights reserved.

Pysh'yev S.,Lviv Polytechnic
Chemistry and Chemical Technology | Year: 2012

The fractions of diesel oil have been desulphurized via air oxidation without the catalysts in the presence of water. The products of sulphuric compounds oxidation were extracted by adsorption or joint adsorption and rectification. The samples of desulphurized diesel oil have been analyzed in accordance with reference documents after their treatment by alkali. The lubricity of the raw materials (straight-run diesel oil and hydrogenised fuel), desulphurized straight-run diesel oil (DSDO), hydrogenised fuel with DSDO additives and two samples of the fraction 553-623 K purified in the presence of water and without it has been determined. © Pysh'yev S., 2012.

Malyk O.,Lviv Polytechnic
Diamond and Related Materials | Year: 2012

The processes of the charge carrier scattering on the short-range potential caused by interaction with polar and nonpolar optical phonons, piezoelectric and acoustic phonons, static strain, neutral and ionized impurities in wurtzite n-GaN with impurity concentration 1.1 × 10 16 cm - 3 ÷ 1.9 × 10 18 cm - 3 and in wurtzite p-GaN with impurity concentration 1.9 × 10 19 cm - 3 ÷ 2.6 × 10 20 cm - 3 are considered. The temperature dependences of electron mobility in the range 15 ÷ 500 K and hole mobility in the range 100 ÷ 1000 K are calculated. © 2011 Elsevier B.V. All rights reserved.

Popovych R.,Lviv Polytechnic
Finite Fields and their Applications | Year: 2013

We construct explicitly in any finite field of the form Fq[x]/ (Xm- a) elements with multiplicative order at least 22m3. © 2012 Elsevier Inc. All rights reserved.

Malyk O.P.,Lviv Polytechnic
Canadian Journal of Physics | Year: 2014

The processes of electron scattering on a short-range potential caused by interaction with polar and nonpolar optical phonons, piezoelectric and acoustic phonons, static strain, and neutral and ionized impurities in wurtzite n-ZnO with impurity concentration ∼1 × 1017 cm-3 are considered. The temperature dependences of electron mobility and Hall factor in the range 15/550 K are calculated. © 2014 Published by NRC Research Press.

Agency: European Commission | Branch: FP7 | Program: MC-IIFR | Phase: FP7-PEOPLE-2010-IIF | Award Amount: 15.00K | Year: 2014

The main goal of this project is development of new production technology for most efficient and more stable application of crystalline materials as active elements of electro-optic or nonlinear optical cells, especially for control and/or conversion of superpowerful laser radiation. In the framework of such technol-ogy it is proposed to create new electro-optic interferometric setup and modernize existing nonlinear optical setup as well as to develope the necessary fundamental methodology being suitable for precise determina-tion and calculation of complete sets of electro-optic tensor coefficients or nonlinear optical second order susceptibilities in crystalline materials of different symmetry. Using these setups author plans to study the electro-optic and nonlinear optical characteristics of doped lithium niobate and borate family crystals or other low symmetry prospective inorganic/organic crystalline materials. It is therefore expected to derive for these materials a complete tensor sets of electro-optic or nonlinear optical coefficients that will represent input parameters for further 3D-analysis of spatial anisotropy of investigated effects using constructed in-dicative surfaces and their stereographic projections. On this basis the global maxima of electro-optic or nonlinear optical effects for selected crystals will be determined and for these maxima their angular stability will be calculated using improved own software. In the final step it is planed to design the laboratory proto-type of such cell suitable for more efficient and stable control or conversion of superpowerful laser radiation made of mentioned above crystalline materials. Thus it will be a significant contribution in development of new production technology for most efficient and more stable application of electro-optic and nonlinear opti-cal crystalline materials.

Popovych R.,Lviv Polytechnic
Finite Fields and their Applications | Year: 2012

We obtain explicit lower bounds on multiplicative orders of finite field elements that have more general form than Gauss periods of a special type. This bound improves in a partial case of Gauss period the previous bound of Ahmadi, Shparlinski and Voloch (2010) [2]. © 2012 Elsevier Inc.

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