bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Influence of Dimensional Static and Dynamic Charge on the Spectral Parameters and Active Dynamic Conductivity of Resonanse Tunnelling Structures with Constant Electric Field
Authors: Boyko I.V. , Gryschyk A.M. 
Published: March 2018

In the model of effective masses and rectangular potentials obtained self-consistent solution of Poisson and Schrödinger equations for different concentrations of electrons.
It has been calculated spectral parameters and active dynamic conductivity for three-well nanostructure as active band of experimental quantum cascade laser.
It has been established, that space charge deforms shape dependence of transmission factor of electron energy from Lorentzian shape to quasi-Lorentzian, shifting their maximum value to the high energy region and increasing the lifetimes of electronic quasistationary states.
It was shown, that with increasing concentration of electrons energy of laser radiation in quantum transitions and decreases, and the total value of active dynamic conductivity increases so, that it increases the partial contribution component of conductivity, determined by electron flux, directed opposite to the exit of nanostructure.
Magneto- and Tensoresistance of the p Ge Compensated Crystals in the Range of Weak, Intermediate and Classically Strong Magnetic Fields
Authors: Gaidar G.P. 
Published: March 2018

On the crystalsof compensatedp‑Ge (with the compensation factor of k = NSb/NGa = 0.5) the transverse (Н ^ (J // X)) magnetoresistance (within the magnetic fields of 0 < Н £ 22.3 kOe) at fixed values of the mechanical stresses Хі = 0; 0.2; 0.4; 0.6; 0.9; 1.1; 1.5 GPa were measured at 77 K. These mechanical stresses X created the elastic deformation along the samples, the crystallographic orientation of which coincided with the direction of [100]. Also at fixed magnetic field intensities Ні = 2; 4; 8; 10; 15; 20; 22.3 kOe the dependencies of resistivity on the mechanical stress X, which coincides with the longitudinal axis of the crystal (X // J // [100]) and changes in the range of 0 £ Х £ 1.5 GPa, were measured. Last dependences characterized by the presence of a minimum in the range of X ~ 0.5 ¸ 0.6 GPa at the minimal magnetic field intensities Н = 2 kOe, which was shifted to the values of X ~ 0.2 ¸ 0.3 GPa with increasing Н up to 22.3 kOe.
Electrical Parameters of SnO2 Based Varistor Ceramics with CaO and BaO Additions
Authors: Gaponov A.V. , Vorobiov O.V. , Vasyliev A.M. 
Published: March 2018

In the tested SnO2-Co3O4-Nb2O5-Cr2O3-CuO varistor ceramics the adding of CaO or BaO oxides leads to the decrease of the electric conductivity in the low electric field and correlated increase of the potential barrier height at the SnO2 grain boundaries (from 0.7 to 1.0 eV). The coordinated changes of electrical parameters with the increase of the burning temperature from 1520 to 1620 К (the increase of the linear shrinkage, a grain size, an electric conductivity, a nonlinear coefficient , a normalized nonlinear coefficient , a dielectric permittivity and the decrease of the qualifying electric field E1, an activation energy of electric conduction and a grain specific resistance) prove the barrier mechanism of electric conductivity in the SnO2 based ceramics. The highest data and = 0.02 cm·V-1 has ceramics with CaO addition baked at 1620 K. According to the impulse experimental data in the high electric field the increase of burning temperature causes the increase of SnO2 grain average size and the decrease of their grain specific resistance . The obtained value = 1.1 Ohm·cm for SnO2-Co3O4-Nb2O5-Cr2O3-CuO ceramics is the lowest among those found in SnO2 based ceramics.
Effect of Magnetic Field on Energy Spectrum and localizationof electron in multilayeredspherical nanosystems
Authors: Holovatsky V. , Bernik I. , Yahnevych M. 
Published: March 2018

The effect of magnetic field on electron energy spectrum, wave functions and probability densities in multilayered spherical quantum-dot-quantum-well (QDQW) CdSe/ZnS/CdSe/ZnS is studied in order to clear the question if the quasi-particle can tunnel through potential barrier under the influence of the external field. Computations are performed in the framework of the effective mass approximation and rectangular potential barriers model. It is used the method of the wave functions expansion over the complete basis of functions obtained as an exact solutions of the Schrodinger equation for the electron in QDQW without the magnetic field.
It is shown that magnetic field takes off the spectrum degeneration with respect to the magnetic quantum number and deforms electron wave functions. The field stronger effects on the spherically-symmetric states, especially if the electron is localized in outer potential well. It is theoretically confirmed that under the influence of magnetic field the quasi-particle can essentially change its location tunneling through nanoscale potential barrier. That phenomenon would appear in optical properties of nanostructure.
Synthesis of Carbon-Silica Nanomaterials by Carbonization of Cellulose Acetate and Polyisocyanate Copolymer
Authors: Goncharuk V.V. , Dubrovin I.V. , Dubrovina L.V. , Kucheruk D.D. , Naboka O.V. , Ogenko V.M. 
Published: March 2018

Cellulose acetate and polyisocyanate copolymer synthesized by mechanical mixing of cellulose acetate, polyisocyanate and fumed silicon dioxide in the presence of nickel chloride was carbonized in silicon dioxide template. Copolymer and silicon dioxide template were formed simultaneously. Composite structure and composition was studied with SEM and EDS. SEM showed that porous carbonaceous nanomaterial was synthesized. Formed carbon is represented by coating on silicon dioxide, layered ribbon-like and fibrous structures in template pores with size from several nm (thickness) to several microns (length). Metallic nickel crystals up to 200 nm in size were fabricated in composite pores from Nickel chloride by reduction of Ni2 with products of pyrolysis of organic compounds.
Morphology of PbTe Crystal Surface Sputtered by Argon Plasma under Secondary Neutral Mass Spectrometry Conditions
Authors: Zayachuk D.M. , Csik A. , Slynko V.E. 
Published: March 2018

We have investigated morphology of the lateral surfaces of PbTe crystal samples grown from melt by the Bridgman method sputtered by Ar+ plasma with ion energy of 50 – 550 eV for 5 - 50 minutes under Secondary Neutral Mass Spectrometry (SNMS) conditions. The sputtered PbTe crystal surface was found to be simultaneously both the source of sputtered material and the efficient substrate for re-deposition of the sputtered material during the depth profiling. During sputtering PbTe crystal surface is forming the dimple relief. To be re-deposited the sputtered Pb and Te form arrays of the microscopic surface structures in the shapes of hillocks, pyramids, cones and others on the PbTe crystal sputtered surface. Correlation between the density of re-deposited microscopic surface structures, their shape, and average size, on the one hand, and the energy and duration of sputtering, on the other, is revealed.
Structure and Optical Properties of B'- Phase of Ag8SnSe6
Authors: Semkiv І.V. 
Published: March 2018

Energy dispersive x-ray spectroscopy of lowtemperature b¢-Ag8SnSe6 crystalcarried out. Energy dispersive spectrum shows only peaks related to Ag8SnSe6. Experimental optical absorption spectrum and band gap value 0.82 eV are determined. Theoretical calculation of absorption spectrum shows good agreement with experimental studies. Modeling of crystal structure of Ag8SnSe6 argyrodite and interatomic distances calculation are carried out.
Optical Studies of the Interactions CdS and CdTe Nanoparticles with a Human Serum Albumin
Authors: Stolyarchuk I.D. , Shporta O.A. 
Published: March 2018

The interaction between CdS , CdTe nanoparticles and human serum albumin (HSA) was studied by absorption and photoluminescence spectroscopy. The performed transmission electron microscopy (TEM) analysis suggests of spherical shape of nanostructures with small size distribution. In the absorption spectra of the colloidal nanoparticles exciton band was found to be shifted to higher photon energy as compared with that for bulk crystals due to the quantum confinement effect. It was shown that addition of HSA to colloidal nanocrystals leds to a gradual decrease of absorption and broadening of exciton structure, resulting in forming nanoparticles–HSA complexes. The photoluminescence quenching results indicated that the quenching effect of nanoparticles CdTe on HSA fluorescence depend on the temperature and the nature of quenching is static. When the concentration of CdS nanoparticles in solution with HSA over 1,5 10-6 mol L-1, in addition to static quenching mechanism of photoluminescence increases of dynamic quenching mechanism.
Structure and Vibrational Spectra of thin Films β-Ga2O3
Authors: Bordun O.M. , Partyka M.V. , Medvid I.I. , Kukharskyy I.Yo. , Ptashnyk V.V. , Bordun B.O. 
Published: March 2018

The structure, phase composition and surface morphology of thin films b-Ga2O3, obtained by high-frequency ion-plasma sputtering, after annealing at different atmosphere was investigated. The spectra of IR reflection of system thin film b-Ga2O3 - fused quartz substrate υ-SiO2 in region 400–1600 cm-1 at 295 K were measured. The peaks in the spectrum of films b-Ga2O3, associated with vibration of Ga – O fragments in structural tetrahedral GaO4 and octahedral GaO6 complexes was interpreted.
Electrochemical Investigation of Hydrogen Influence on GaSe–PbSe System
Authors: Balitskii О.A. , Polishchuk N.M. 
Published: March 2018

It has been investigated the electrochemical characteristics of gallium and lead selenides, depending on electrolyte type with and without the presence of solar irradiation. During the sunlight irradiation polarization takes place at the low values of current density and more positive value of potentials in comparison with the result obtained in darkness.
Influence of the C4H6O6 Concentration in the (NH4)2Cr2O7 HBr C4H6O6 Composition on the Chemical-Dynamic Polishing of the III-V Semiconductors
Authors: Levchenko I.V. , Malanych G.P. , Tomashyk V.M. , Stratiychuk I.B. 
Published: March 2018

The paper presents the results of experimental determination of the influence of the initial concentration of tartaric acid on the features of the chemical interaction of InAs, InSb, GaAs and GaSb with (NH4)2Cr2O7‑HBr‑C4H6O6 etching solutions. It was established that C4H6O6 decreases the general crystals dissolution rate because it increases the etching compositions viscosity, and also enhances the polishing properties of the etching solutions. The comparative analysis of the etching mixtures composition changes influence demonstrates that the using of 40 % C4H6O6, in comparison with 27 %, provides the higher quality polishing of the crystals surface.
Miniband Electroconductivity in Superlattices of Cubic Quantum Dots of the InAs/GaxIn1-xAs Heterosystem
Authors: Boichuk V.I. , Bilynskyi I.V. , Pazyuk R.I. 
Published: March 2018

In this paper, the model of InAs/GaxIn1-xAs cubic quantum dot superlattices (CQDS) of various dimensionality has been proposed. The energy spectra of electrons and holes of the quantum dot superlattice have been determined in the effective mass approximation and modified Kronig-Penney model. In the frame of this model, the spectra of charges of 3D, 2D and 1D-superlattices can be obtained by changing respective distances between the elements of the superlattice. The energy dependence of the electron and hole subbands (under-the-barrier subbands and over-the-barrier subbands) on the wave vector of the superlattice has been calculated. The number of under-the-barrier subbands is determined by QD size and width of each subband is defined by QD size, distances between superlattice elements and subband numerical index.
The dependences of the Fermi energy and concentration of charge carriers on temperature, concentration of impurities, energy of impurity levels have been obtained and analyzed. We have taken account of the dependence of electron relaxation time on temperature caused by scattering of carriers on both phonons and donor centers. The effect of the impurity system on electroconductivity of the CQDS is investigated.
Investigation of the Effect of the Electron-Beam Crucible Zone Melting of Metallurgical Silicon on Refining and Structure Formation of Ingots
Authors: Gokhman O.R. , Asnis Yu.A. , Piskun N.V. , Statkevich I.I. , Velykoivanenko O.A. , Rozynka G.F. , Milenin A.S. , Babych V.M. 
Published: March 2018

The paper presents the results of studies obtained with the development of the technology of electron-beam crucible impregnation of metallurgical silicon. It is shown that refining of silicon from background and dopant impurities in electron-beam crucible-free zone melting occurs by zone purification during melting and as a result of evaporation of impurities from the sample surface. The mathematical model and computational experiment were been performed to determine the temperature gradient at different rates of zone melting. It was found the diapason of temperature gradients, which provides the columnar structure of crystallites and the purification of the samplesdue the melting with the zone recrystallization procedure. The level of the resistivity of the ingots increases at the end.
The Influence of High-Dispersed Barium Titanate, in Films With Addition of, and Based on Poly(Vinylidene) Fluoride), on Structure and Electrophysical Properties of Ones
Authors: Dzubenko L. S. , Makhno S. M. , Sapyanenko O. O. , Gorbyk P. P. 
Published: March 2018

With the aim of the creation of effective electret materials, the composite films, based on poly(vinylidene fluoride) (PVF), in addition with segnetoelectric of barium titanate (BaTiO3) were obtained in the concentration range of 0.5 – 5.0 %vol. There are PVF’s melting temperature range becomes narrower, when at 0.5 – 1.0 % vol. of, and, this pointing on more homogeneous crystallite formation by dimensions in. When at high content (5.0 % vol.) of BaTiO3, there is a decrease of crystallization temperature observed (at 5 ºC), and then, there is temperature range broadening exists, and this pointing on forming of larger, but less homogeneous crystallites by dimensions in. It is determined, when composite films of PVF - BaTiO3 , that surface charge is more stable at BaTiO3 content of 4.0 %vol. in, and then, one reaches a value of 10-6 Cl/m2, when at conditions of treatment with electric field and crown discharge, and, at film charge value of 500 kV/m in. There are non-linear dependence of dielectric permittivity exists, either when at low, or very high frequencies, and this may be linked with the influence of high-disperse addition on polymers crystalline structure formation, and sub-surface layers of one.
Promising Cathode Material for Lithium Power Sources LaFe0.5Cr0.5O3
Authors: Yaremiy I. P. , Mokhnatskyi M. L. , Mokhnatska L. V. , Yaremiy S. I. , Kachmar A. I. 
Published: March 2018

Nanoscale powders of LaFe0.5Cr0.5O3 with perovskite structure were synthesized by the sol-gel combustion method in this work. From X-rays phase analysis obtained material consisted of one phase LaFe0.5Cr0.5O3 (space group P m -3 m). The average size of RCS of test material is 21 nm. The specific surface area is 14 m2/g. The average particle size is 63.7 nm by approximation that particles form is spherical. Nanoscale powders of LaFe0.5Cr0.5O3were tested as cathode material for lithium power sources. The cathode material demonstrates the specific power capacity of 571 A•h/kg when the discharge of the source is up to 0.5V.
The Types of Business Risk Identified in Integrated Reporting
Authors: Chłapek Katarzyna 
Published: March 2018

The paper presents the possibilities of identifying business risk on the basis of data disclosed in integrated reporting. The research method used relies on a review of Polish and foreign literatures and an empirical analysis of integrated reports disclosed in 2016. The structure of the reports, which complies with the most recent trends and international recommendations with regard to integrated reporting, confirms the hypothesis put forward in the paper. The concluding remarks aim to arouse interest in research on the possibilities of verifying and assessing disclosures related to the identification of risk in integrated reporting.
Wpływ kryzysu finansowego na możliwość wprowadzenia federalizmu fiskalnego w strefie euro
Authors: Kawalec Marcin 
Published: March 2018

The economic and monetary union is undergoing crisis, one triggered by both internal and external factors. The problems that arose as a result of macroeconomic shock brought the monetary union’s structural flaws to the fore. The purpose of this article is to determine if a stable monetary union is possible without a fiscal union and how the financial crisis has affected the possibility of fiscal federalism in the euro area. The problem of the euro area was tackled in the context of the economic crisis and will highlight the main problems of the monetary union and the management of the financial crisis in the EU. An analysis of the institutional arrangements introduced as a result of emerging problems in achieving nominal convergence in the euro area and budgetary imbalances arising from the global financial crisis was also examined. These solutions can in the long term form the basis for the creation of a fiscal union within the euro area.
Symbols of Sacred Art in the Corporate Identity of Insurance Companies
Authors: Trynchuk Viktor 
Published: March 2018

This article examines the development of the insurance business in Ukraine and Poland from the late nineteenth to the early twenty-first centuries. It identifies special aspects of the formation and use of elements of sacred art in the corporate identity of insurance companies. Dniester Mutual Insurance Company and Florianka Krakow Mutual Insurance Company are a particular focus. Examples of the use of images of St. Florian, crosses and the inscription “In the name of the Lord” in corporate identity of insurance companies are provided.
The Myth of the City in the French and the Georgian Symbolist Aesthetics
Authors: Oboladze Tatia 
Published: March 2018

“Modern Art is a genuine offspring of the city… the city created new images, here the foundation was laid for the literary school, known as Symbolism…The poet’s consciousness was burdened by the gray iron city and it poured out into a new unknown song” (Tabidze 2011: 121-122), - writes Georgian Symbolist Titsian Tabidze in his program article Tsisperi Qantsebit (With Blue Horns). Indeed, in the Symbolist aesthetics the city-megalopolis, as a micro model of the material world, is formed as one of the basic concepts.
Where there is disrespect, you will find violence: The Demography of Child-on-Child Disrespect in Egyptian
Authors: Khalifa Huda Assem Mohammed 
Published: March 2018

PURPOSE: Demographic factors such as gender, residential status, family income, father’s job, mother’s job, father’s education and mother’s education play an important role in children’s day to day lives, and especially in the disrespecting of children by their peers. The present study identifies the influence of these seven factors for the maltreatment of children through five dimensions: making fun of a child’s accent, making fun the child’s place of residence, making fun of the child’s culture, making fun of the child’s friends, and annoying a child because of his/her accent.
METHODS: Exploratory Factor Analysis and Confirmatory Factor Analysis along with path diagrams are used to extract child disrespect from the three factors and Structural Equation Modelling (SEM) is run to verify the above factor structure and evaluate the influence of predictors for child disrespect by peers.
FINDINGS: The significance test of p-values in the regression equation shows that gender, mother’s education, and mother’s job are the statistical predictors for the disrespecting of children at a 1% level of significance and mediate this effect through four of the five dimensions.
CONCLUSION: The education levels of mothers play a major role in ameliorating the victimization of children by peer disrespect. Girls are more likely to be victimized than boys, and a mother’s job also significantly ameliorates the peer disrespect shown to her children.
POR UMA ESTÉTICA DAS CULTURAS DO SUL – ONDE O REALISMO SE CONFUNDE COM O MÍTICO
Authors: Dravet Florence , Castro Gustavo De 
Published: March 2018

O trabalho visa descrever e analisar uma estética que pode ser qualificada de brasileira: a estética do terror resultante das injustiças sociais unida à estética da festa e da alegria resultante de um vitalismo mítico e mágico. A metodologia consistiu em comparar dois pontos de vista: o primeiro, adotando o conceito de “carnavalização”, parte do ponto de vista de alguns sociólogos europeus, tais como Empoli e Maffesoli, para explicar a estética brasileira que ganha o mundo através do fenômeno de comunicação de massa globalizada; o segundo, adota o conceito de “antropofagia cultural” e propõe uma leitura latino-americana da realidade, situando sua estética no entrecruzamento de dois paradigmas, o logos e o mythos, para mostrar a existência no Brasil, de uma força estética resultante de um hibridismo cultural criativo.
PROCESSOS CRIATIVOS E METODOLOGIAS DE PROJETOS PARA DESIGN E ARQUITETURA: O EXEMPLO DA BIÔNICA
Authors: Lima Fábio F. 
Published: March 2018

Esse artigo discute o papel das metodologias projetuais inseridas enquanto processos de atividades ampliadoras dos potenciais criativos. Enfatiza-se a importância dessa temática dentro dos exercícios profissionais do designer e do arquiteto, tendo a criatividade como condição indispensável. Além disso, o ensino deve propiciar uma habilidade em conceber idéias alicerçadas em fundamentações reais e em argumentos que satisfaçam uma lógica: a forma deve ser justificada enquanto resultado de um processo. A título de exemplo, o artigo faz uma abordagem acerca da biônica, extraindo particularidades de um modelo biológico escolhido com proveito objetivo nas intenções de projeto.
A IRONIA COMO UM CONCEITO SEMIOLÓGICO
Authors: Bartholo Arthur 
Published: March 2018

O presente artigo traz uma abordagem do conceito de ironia sob o ponto de vista da semiologia, de maneira a tornar claros os fundamentos da relação dialética que a ironia estabelece com o simbólico, bem como delinear as condições dela ser utilizada como um instrumento de análise conceitual e semiótica. O texto procura trazer uma análise filosófica do conceito de ironia com referências a vários autores que a trouxeram enquanto uma tópica pertinente, e cujas obras, ainda que apenas indiretamente ligadas à ironia, possuem injunções particulares que permitem constituir um vínculo dialético com ela. Nesse sentido, a ironia aparece em sua ambiguidade fundamental, a saber, a de funcionar ao mesmo tempo enquanto uma figura estrutural da retórica e enquanto uma determinação em que o discurso ultrapassa dialeticamente a si próprio e abre espaço para o poético. Portanto, não se trata somente de uma elucidar a aplicabilidade da ironia enquanto um conceito a ser utilizado instrumentalmente, mas trata-se sobretudo de elaborar um ponto de vista irônico que condiciona esteticamente o ponto de vista semiológico.