bluuebunny/crossref_metadata_2025 huggingface dataset:
Heating of oil layer by RF electromagnetic and acoustic field with simultaneous oil production
Authors: Izmailova G.R.
Published: January 2018

In the paper the heat of high-viscosity oil reservoir using two physical fields: RF electromagnetic fields and acoustic. It is the simultaneous production of oil. The formula is derived for the volume of heat sources, resulting in the formation therein during propagation of acoustic waves, which is suitable for the calculations in any zone of the formation. A mathematical model based on the heat equation in cylindrical coordinates. The equation depends only on the radial coordinate. Problem is solved by the finite difference method for the implicit scheme. It is shown that neglecting the absorption of acoustic waves in a thermally distorts the real picture of the temperature field in the formation.
Regimes of stabilization of the flow of anomalous thermoviscous liquid depending on the heat exchange
Authors: Kireev V.N. , Urmancheev S.F.
Published: January 2018

In the paper the results of numerical modeling of the flow of an incompressible fluid with a non-monotonic dependence of the viscosity on the temperature in a channel are presented. On the channel’s walls the heat exchange is specified that are written mathematically in the form of the boundary conditions of the third kind on the basis of the Newton– Richman convective heat exchange law. The regimes of flow stabilization in the channel depending on the Nusselt numbers have been studied. Four different types of unsteady processes are discovered and it has been shown that they are determined by the different heat exchange intensity.
Linear wave propagation in a cylindrical waveguide in a porous medium with layer containing the hydrate
Authors: Gubaidullin A.A. , Boldyreva O.Y. , Dudko D.N.
Published: January 2018

Pressure waves propagating along a cylindrical cavity in a porous medium with hydrate layer are investigated in the linear approximation. Dispersion relations for the basic acoustic mode in a cylindrical cavity in each layer constituting the porous medium are obtained. On the basis of the dispersion relations the coefficients of reflection and transmission through the layer boundaries inside the cavity are calculated. The influence of rock properties, frequency, and length of hydrate layer on the total reflection coefficient from the layer is studied. The obtained results can be used in the interpretation of well data to locate the boundary of layers crossed by the borehole, in particular, layer containing the hydrate.
The rate of stationary wave of filtration combustion of gases in the same fields of temperature and concentration
Authors: Kabilov M.M. , Sadriddinov P.B. , Gulboev B.J. , Kholov O.A.
Published: January 2018

Combustion of hydrogen-methane-air mixtures of gases in an inert porous medium is considered when the temperature fields of the medium end the concentration of the missing component of the mixture are similar. The relationship between the functions of temperature and concentration, as well as the equation for the numerical calculation of the temperature distribution, are obtained. Numerical calculations were made for different compositions of the hydrogen-methane-air mixture of gases and their effects on the wave velocity were determined. Dependences of the wave velocity, the equilibrium temperature, the characteristic size of the combustion zone, and the diffusion coefficient of the missing component on the gas injection rate are studied.
Dynamics of two gas bubbles in liquid in an ultrasonic traveling wave
Authors: Aganin A.A. , Davletshin A.I.
Published: January 2018

The influence of the liquid viscosity and compressibility on the dynamics of two air bubbles (with equilibrium radii of 5 μm) in water at room conditions under the action of a plane ultrasonic wave traveling along the line of the bubble centers (the wavelength is 5000 μm, the amplitude is 0.3 bar) is studied. The initial distance between the centers of the bubbles is six bubble radii. A mathematical model is used, which is fourth-order accurate in terms of the ratio of the radius of the bubbles to the distance between them. It is shown that the spatial displacements of the bubbles are determined mainly by their hydrodynamic interaction. The influence of the liquid viscosity and compressibility is generally significant, and the viscosity affects much more. Without account of the liquid viscosity and compressibility, the bubbles collide with each other after the action of 4.5 running-wave lengths. With taking into account the liquid compressibility, the bubbles under the same action remain remote at a distance on the order of their equilibrium radii, while with additionally allowing for the liquid viscosity, their spacing is kept close to the initial one.
Hydrodynamic interaction of weakly nonspherical gas bubbles in a liquid in the three-dimensional problem statement
Authors: Aganin A.A. , Davletshin A.I.
Published: January 2018

The influence of the relative location of weakly nonspherical gas (air) bubbles in liquid (water) on their hydrodynamic interaction at the pressure antinode of an ultrasonic standing wave is studied. Three essentially different configurations of the mutual arrangement of the bubbles are considered: the linear, planar, and spatial ones. In the linear configuration, three bubbles are located on one straight line. In the planar configuration, five bubbles are situated on two mutually orthogonal straight lines. In the spatial configuration, seven bubbles are located on three mutually orthogonal straight lines. In all the cases, one of the bubbles is central, the others are equally-spaced from it on those lines. All the bubbles are initially spherical with a radius of 3 ?m. Room conditions are considered, the frequency of the wave is 20 kHz, its amplitude is 1.2 times the static liquid pressure. A mathematical model is used, in which the liquid is assumed weakly compressible, the bubbles being homobaric. It is shown that in each configuration of the bubbles the influence of their interaction on their radial dynamics is insignificant. In each configuration, the central bubble remains stationary, while the others move to it at a speed equal for a fixed configuration. At transition from a linear configuration to a planar one and from a planar configuration to a spatial one, the bubble motion speed increases. In all the cases, the deformations of the central stationary bubbles are smaller than those of the rest. Among the central bubbles, the bubble in a planar configuration is deformed most.
Fluid flow through the hydraulic resistance with a dynamically variable geometry
Authors: Nasibullayev I.Sh. , Nasibullaeva E.Sh.
Published: January 2018

In this paper the fluid flow in a flat channel with a hydraulic resistance is studied for two cases of a dynamic change in the channel geometry: transverse compression of the opening of the hydraulic resistance (the flow is caused by a pressure drop applied to the layer) and longitudinal movement of the hydraulic resistance along the channel (the flow is caused by this movement). It is obtained that in a geometry with transverse compression the flow is laminar without the formation of vortices. In a geometry with longitudinal movement of the hydraulic resistance the flow rate of the liquid remains constant with the formation of stable vortices that move along the channel at the rate of motion of the hydraulic resistance. On the base of the modeling results an analytical model that takes into account the flow rate of the fluid from the width of the through hole of the resistance is constructed. This model contains four interpolation parameters and it can be used as an element of a computational stand for determining the generalized flow of liquid in the system under consideration.
Decomposition of tasks in a group of robots using cloud computing technologies
Authors: Darintsev O.V. , Migranov A.B.
Published: January 2018

In this paper, various variants of decomposition of tasks in a group of robots using cloud computing technologies are considered. The specifics of the field of application (teams of robots) and solved problems are taken into account. In the process of decomposition, the solution of one large problem is divided into a solution of a series of smaller, simpler problems. Three ways of decomposition based on linear distribution, swarm interaction and synthesis of solutions are proposed. The results of experimental verification of the developed decomposition algorithms are presented, the working capacity of methods for planning trajectories in the cloud is shown. The resulting solution is a component of the complex task of building effective teams of robots.
Determining the velocity of a moving three-layered plate and the thickness of its filler using natural frequencies of flexural vibrations
Authors: Khakimov A.G.
Published: January 2018

Research has been performed on natural transverse vibrations of a portion of a constant length in a straight threelayered plate with a filler moving along the neutral line of a non-deformed state. The movement takes place between two rigidly fixed coaxial guides (clamps), the distance between them equalling the length of the vibrating portion. The longitudinal force is assumed to constantly act along the neutral line. It has been found that an increase in the natural frequencies of flexural vibrations of the plate occurs with an increase in the thickness of the filler. Using two frequencies of flexural vibrations, we can determine the velocity of the moving three-layered plate and the thickness of its filler. The results of the research work can find technological use in the problems on dynamics and strength of machines and mechanisms in manufacturing three-layered plate with fillers and can be used to determine the velocity of a plate and the thickness of its filler using two frequencies of flexural vibrations.
A pintura abstrata e Schelling: atravessar a “pele da natureza” [Abstract painting and Schelling: crossing "Nature's skin"]
Authors: Assumpção Gabriel Almeida
Published: January 2018

A filosofia das artes plásticas de F. W. J. Schelling (1775-1845) é enraizada em sua filosofia da natureza, seja no postulado da natureza como produtividade, seja nos conceitos de aconsciente e desaceleração. O paralelismo entre produtividade da natureza e criação artística é base, para Schelling, de uma proposta de mímesis que emule a natureza não como mero produto passivo e inerte que se reproduz com fidelidade extrema, mas como força produtora, expressa pela imaginação do artista em seu trabalho de transformar a matéria. Nessa via, intérpretes como Beierwaltes, Frank e Schuback notaram afinidades entre as concepções schellinguianas e os escritos de pintores abstratos, especialmente Paul Klee (1879-1940) e Wassily Kandinsky (1866-1944). Todavia, desses trabalhos, apenas o de Schuback desenvolve textualmente tal proximidade em Klee. Nossa proposta, nesse sentido, consiste em explicitar textualmente a relação entre natureza e pintura abstrata, apontando como tal vínculo norteia a crítica e reavaliação positiva da mímesis de Kandinsky e Klee, aproximando-os de Schelling. [Schelling’s philosophy of plastic arts is deeply rooted in his Philosophy of Nature, whether in the postulate of Nature as productivity or in the concepts of deceleration and a-concious. The parallel between Nature’s productivity and artistic creation is the cornerstone of the Schellinguian conception of mimesis qua emulation of nature as a productive force, and not a mere product. In this line of argument, some interpreters such as Beierwaltes, Frank and Schuback noticed similarities between the writings of abstract painters, particularly Paul Klee (1879-1940) and Wassily Kandinsky (1866-1944). However, only Schuback further developed a conceptual connection between Klee and Schelling based on their writings. Our proposal, in that sense, is to develop the connection between nature and abstract painting in Kandinsky and Klee, thus revealing the similarities between their tenets and Schelling’s.]
A paisagem e sua dimensão estética [The aesthetic dimension of landscape]
Authors: Arraes Esdras Araujo
Published: January 2018

Os estudos que se dedicam à paisagem a compreendem como a materialização de relações entre o homem e o território. Por outro lado, a noção de paisagem abriga, desde sua origem, uma conotação estética, pensada como discurso valorativo da natureza. Assim, o objetivo desse artigo é mostrar a paisagem como categoria do pensamento e parte do campo reflexivo da disciplina Estética. Serão mencionados escritos de determinados filósofos empenhados em interpretar a paisagem em sua dimensão estética. Dentre eles, pode-se citar Georg Simmel, Augustin Berque e Arnold Berleant. Busca-se ampliar sua noção para além das transformações sociais do espaço, celebrando as maneiras sensíveis de apreensão da natureza. Pretende-se, ainda, compreender a noção de paisagem formulada no Renascimento e, especialmente, no final do século XVIII, pondo luz em algumas obras literárias de Goethe, tais como Os sofrimentos do jovem Werther e Escritos sobre arte.[The studies that are dedicated to the landscape understand it as the materialization of relations between man and territory. On the other hand, the notion of landscape has, since its origin, an aesthetic connotation, thought of as a valorative discourse of nature. Thus, the purpose of this article is to show the landscape as a category of thought and part of the reflective field of the Aesthetic discipline. It will be mentioned writings of certain philosophers committed to interpret the landscape in its aesthetic dimension. I will mention, for instance, the research of Georg Simmel, Augustin Berque and Arnold Berleant. It seeks to broaden its notion beyond the social transformations of space, celebrating the sensitive manners of apprehending nature. It is also intended to understand the notion of landscape formulated in Renaissance and especially in the late Eighteenth Century putting light on some of Goethe's literary works, such as The sorrows of young Werther and Elective affinities.]
Проводимость гетеропереходов Ga-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=--GaAs
Authors: Калыгина В.М. , Ремезова И.Л. , Толбанов О.П.
Published: January 2018

AbstractThe effect of annealing in argon at temperatures of T _an = 700–900°C on the I – V characteristics of metal–Ga_2O_3–GaAs structures is investigated. Samples are prepared by the thermal deposition of Ga_2O_3 powder onto GaAs wafers with a donor concentration of N _ d = 2 × 10^16 cm^–3. To measure the I – V characteristics, V/Ni metal electrodes are deposited: the upper electrode (gate) is formed on the Ga_2O_3 film through masks with an area of S _ k = 1.04 × 10^–2 cm^2 and the lower electrode in the form of a continuous metallic film is deposited onto GaAs. After annealing in argon at T _an ≥ 700°C, the Ga_2O_3- n -GaAs structures acquire the properties of isotype n -heterojunctions. It is demonstrated that the conductivity of the structures at positive gate potentials is determined by the thermionic emission from GaAs to Ga_2O_3. Under negative biases, current growth with an increase in the voltage and temperature is caused by field-assisted thermal emission in gallium arsenide. In the range of high electric fields, electron phonon-assisted tunneling through the top of the potential barrier is dominant. High-temperature annealing does not change the electron density in the oxide film, but affects the energy density of surface states at the GaAs–Ga_2O_3 interface.
Влияние термических и плазменных обработок на фотолюминесценцию пленок оксида цинка
Authors: Абдуллин Х.А. , Гриценко Л.В. , Кумеков С.Е. , Мархабаева А.А. , Теруков Е.И.
Published: January 2018

AbstractThe structure and electrical properties of ZnO films and the effect of annealing in a hydrogen-plasma atmosphere on the photoluminescence spectra of the films are studied. Short-term plasma treatment in a hydrogen atmosphere improves the electrical properties and brings about the appearance of an intense near-band-edge photoluminescence band. The heavy dependence of the intensity and spectral shape of nearband- edge photoluminescence on the conditions of preliminary annealing is observed. It is shown that the photoluminescence spectrum consists of several contributions. The effect of an ultraviolet-radiation-induced increase in the photoluminescence intensity is observed. The effect is reversible: the photoluminescence signal is intensified after exposure to ultraviolet radiation and reduced to the initial intensity upon keeping the samples in the dark. The nature of experimentally observed metastable shallow donors is discussed.
Внутризонное поглощение излучения дырками в квантовых ямах InAsSb/AlSb и InGaAsP/InP
Authors: Павлов Н.В. , Зегря Г.Г. , Зегря А.Г. , Бугров В.Е.
Published: January 2018

AbstractMicroscopic analysis of intraband radiation absorption by holes with their transition to the spin-split band for InAsSb/AlSb and InGaAsP/InP semiconductor quantum wells is performed in the context of the four-band Kane model. The calculation is performed for two incident-radiation polarizations: along the crystal-growth axis and in the quantum-well plane. It is demonstrated that absorption with transition to the discrete spectrum of spin-split holes has a higher intensity than absorption with transitions to the continuous spectrum. The dependences of the intraband absorption coefficient on temperature, hole density, and quantum- well width are thoroughly analyzed. It is shown that intraband radiation absorption can be the main mechanism of internal radiation losses in lasers based on quantum wells.
Люминесцентные свойства тонких пленок Cd-=SUB=-x-=/SUB=-Zn-=SUB=-1-x-=/SUB=-O
Authors: Лотин А.А. , Новодворский О.А. , Паршина Л.С. , Храмова О.Д. , Черебыло Е.А. , Михалевский В.А.
Published: January 2018

AbstractThin Cd_ x Zn_1 – x O films with a Cd content in the range from zero to 35 at % are synthesized by pulsed laser deposition. A record-breaking solubility limit of 30 at % of Cd in wurtzite-structured Cd_ x Zn_1 – x O thin films is attained. Apart from the exciton peak, additional peaks associated with an inhomogeneous distribution of Cd in the samples are observed in the low-temperature (10 K) photoluminescence spectra of Cd_0.15Zn_0.85O and Cd_0.3Zn_0.7O films. An unsteady ( S -like) temperature dependence of the spectral position of the exciton photoluminescence peak in Cd_ x Zn_1 – x O films is observed. Such a dependence is associated with the effect of the localization of charge carriers.
Электронная структура и магнитный фазовый переход в геликоидальных ферромагнетиках Fe-=SUB=-1-x-=/SUB=-Co-=SUB=-x-=/SUB=-Si
Authors: Повзнер А.А. , Волков А.Г. , Ноговицына Т.А.
Published: January 2018

AbstractLSDA + U + SO calculations of the electronic structure of helicoidal Fe_1 - x Co_ x Si ferromagnets within the virtual crystal approximation have been supplemented with the consideration of the Dzyaloshinski-Moriya interaction and ferromagnetic fluctuations of the spin density of collective d electrons with the Hubbard interactions at Fe and Co atoms randomly distributed over sites. The magnetic-state equation in the developed model describes helicoidal ferromagnetism and its disappearance accompanied by the occurrence of a maximum of uniform magnetic susceptibility at temperature T _ C and chiral fluctuations of the local magnetization at T > T _ C . The reasons why the magnetic contribution to the specific heat at the magnetic phase transition changes monotonically and the volume coefficient of thermal expansion (VCTE) at low temperatures is negative and has a wide minimum near T _ C have been investigated. It is shown that the VCTE changes sign when passing to the paramagnetic state (at temperature T _ S ).
Особенности отклика церия на импульсные воздействия
Authors: Атрошенко С.А. , Зубарева А.Н. , Морозов В.А. , Савенков Г.Г. , Уткин А.В.
Published: January 2018

AbstractExperimental studies of cerium at high rates and nanosecond durations of action have been performed. The isomorphic phase transition was studied upon shock compression. The spall strength of cerium has been determined. Cerium demonstrates anomalous compressibility upon dynamic loading. Stress waves dampen under action of a high-current electron beam due to the energy dissipation during fragmentation and twinning.
Электронный транспорт в нанопроволоках Те
Authors: Березовец В.А. , Кумзеров Ю.А. , Фирсов Ю.А.
Published: January 2018

AbstractThe temperature and magnetic field dependences of the voltage-current characteristics of tellurium nanowires manufactured via the insertion of tellurium into chrysotile asbestos pores from a melt have been measured. The measurements have been performed within a broad range of temperatures and magnetic fields. The results of such measurements are analyzed by means of their comparison with the predictions of theoretical models developed for the case of one-dimensional structures. The obtained dependences are concluded to most closely correspond to Luttinger liquid theory predictions. This result agrees with the concepts that the major mechanism of current in such one-dimensional wires does not depend on the material inserted into pores, but depends only on the dimension of conducting wires.
Исследование пленок диметилдиимида перилентетракарбоновой кислоты методами циклической термодесорбции и сканирующей зондовой микроскопии
Authors: Почтенный А.Е. , Лаппо А.Н. , Ильюшонок И.П.
Published: January 2018

AbstractSome results of studying the direct-current (DC) conductivity of perylenetetracarboxylic acid dimethylimide films by cyclic oxygen thermal desorption are presented. The microscopic parameters of hopping electron transport over localized impurity and intrinsic states were determined. The bandgap width and the sign of major current carriers were determined by scanning probe microscopy methods (atomic force microscopy, scanning probe spectroscopy, and photoassisted Kelvin probe force microscopy). The possibility of the application of photoassisted scanning tunneling microscopy for the nanoscale phase analysis of photoconductive films is discussed.
Высокотемпературная теплоемкость TmBiGeO-=SUB=-5-=/SUB=- и YbBiGeO-=SUB=-5-=/SUB=-
Authors: Денисова Л.Т. , Белоусова Н.В. , Галиахметова Н.А. , Денисов В.М. , Голубева Е.О.
Published: January 2018

AbstractThe TmBiGeO_5 and YbBiGeO_5 compounds have been synthesized from Tm_2O_3 (Yb_2O_3), Bi_2O_3, and GeO_2 oxides by the solid-state synthesis with successive burning at 1003, 1073, 1123, 1143, 1173, and 1223 K. High-temperature specific heat of the oxide compounds has been measured by differential scanning calorimetry. Basing on the experimental dependences C _p = f ( T ), the thermodynamic properties of the oxide compounds, i.e., the enthalpy and entropy variations, have been calculated.
Исследование электрофизических характеристик катион-замещенной керамики гексаалюмината бария методом импедансной спектроскопии
Authors: Беляев Б.А. , Дрокин Н.А. , Полубояров В.А.
Published: January 2018

AbstractWe report on the behavior of frequency and temperature dependences of the impedance of a measuring cell in the form of a parallel-plate capacitor filled with barium hexaaluminate ceramics with four aluminum cations replaced by iron (BaO · 2Fe_2O_3 · 4Al_2O_3). The measurements have been performed in the frequency range of 0.5–10^8 Hz at temperatures of 20-375°C. A technique for determining the electrical properties of the investigated ceramics is proposed, which is based on an equivalent electric circuit allowing the recorded impedance spectra to be approximated with sufficiently high accuracy. The established spectral features are indicative of the presence of two electric relaxation times different from each other by three orders of magnitude. This fact is explained by the difference between the charge transport processes in the bulk of crystallites and thin intercrystallite spacers, for which the charge activation energies have been determined.
Особенности магниторефрактивного эффекта в многослойной металлической наноструктуре [CoFe/Cu]-=SUB=-n-=/SUB=--=SUP=-*-=/SUP=-
Authors: Юрасов А.Н. , Телегин A.В. , Банникова Н.С. , Миляев М.А. , Сухоруков Ю.П.
Published: January 2018

AbstractThe features of magnetorefractive effect (MRE) in metallic multilayer film Ni_48Fe_12Cr_40(50 Å)/[Co_90Fe_10(14 Å)/Cu(22 Å)]_8/Cr(20 Å) nanostructures, which exhibit giant magnetoresistance at room temperature, are investigated experimentally and theoretically. We show that the MRE in these structures reaches 1.5% in an applied magnetic field of 3.5 kOe, in a broad part of the IR region, and can change sign for both transmission and reflection of light. The refraction and extinction coefficients that are calculated for the nanostructures in an external magnetic field are in good agreement with our experimental data. The deduced formulas can be applied to estimating the MRE in multilayer metallic nanostructures.
Визуализация динамических вихревых структур в магнитных пленках с одноосной анизотропией (микромагнитное моделирование)
Authors: Зверев В.В. , Изможеров И.М. , Филиппов Б.Н.
Published: January 2018

AbstractThree-dimensional computer simulation of dynamic processes in a moving domain boundary separating domains in a soft magnetic uniaxial film with planar anisotropy is performed by numerical solution of Landau-Lifshitz-Gilbert equations. The developed visualization methods are used to establish the connection between the motion of surface vortices and antivortices, singular (Bloch) points, and core lines of intrafilm vortex structures. A relation between the character of magnetization dynamics and the film thickness is found. The analytical models of spatial vortex structures for imitation of topological properties of the structures observed in micromagnetic simulation are constructed.
Динамика полосы Людерса и разрушение алюминий-магниевого сплава, инициированные концентратором напряжений
Authors: Шибков А.А. , Желтов М.А. , Гасанов М.Ф. , Золотов А.Е.
Published: January 2018

AbstractSpatio-temporal localization of deformation and the rupture of the aluminum-magnesium AlMg6 alloy, initiated by a geometrical stress concentrator, are studied in situ by video recording at a speed of 500 to 20000 frames/s. It is established that a stress concentrator in the form of a small notch with a depth about 1% of the width of a flat specimen is an attractor of bands of macrolocalized plastic deformation, starting from a Lüders band and ending with the start of the main crack. The key role of intersecting deformation macrobands in the development of the main crack is revealed. Possible micromechanisms of viscous destruction associated with the dynamics of the intersection of deformation bands are discussed.
Фотоиндуцированные эффекты в спектрах люминесценции ZnO
Authors: Акопян И.Х. , Лабзовская М.Э. , Новиков Б.В. , Лисаченко А.А. , Серов А.Ю. , Философов Н.Г.
Published: January 2018

AbstractThe effect of intense UV irradiation on the photoluminescence (PL) spectra of ZnO powders and nanocrystalline films obtained by atomic layer deposition (ALD) was investigated. At room temperature, the behavior of the spectra under continuous UV irradiation in multiple vacuum-atmosphere cycles was studied. The changes in the intensities of exciton radiation and radiation in the “green” band region, associated with the phenomena of oxygen photodesorption and photoadsorption, are discussed. In the temperature range of 5–300 K, the effect of strong UV irradiation on the near-edge luminescence spectrum of ZnO films was studied. The nature of a new line arising in the photoluminescence spectra of an irradiated film in the region of emission of bound excitons is discussed.
Двумерные световые пули в среде с неоднородной плотностью углеродных нанотрубок
Authors: Двужилов И.С. , Белоненко М.Б.
Published: January 2018

AbstractThe theoretical problem of propagation dynamics of ultrashort optical pulses (light bullets) in a medium with inhomogeneous density of carbon nanotubes is considered. It is shown that light bullets propagate stably and steadily.
Термическое расширение и люминесцентные свойства триортогерманатов CaLa-=SUB=-2-x-=/SUB=-Eu-=SUB=-x-=/SUB=-Ge-=SUB=-3-=/SUB=-O-=SUB=-10-=/SUB=- (x=0.0-0.6)
Authors: Липина O.А. , Сурат Л.Л. , Бакланова Я.В. , Бергер И.Ф. , Тютюнник А.П. , Зубков В.Г.
Published: January 2018

AbstractSolid solutions CaLa_2- x Eu_ x Ge_3O_10 ( x = 0.0–0.6, Δ x = 0.1) have been synthesized for the first time. The compounds are isostructural to CaLa_2Ge_3O_10, they crystallize in the monoclinic system, space group P 2_1/ c , Z = 4. The low-temperature X-ray diffraction studies have revealed the strain anisotropy of germanate CaLa_2Ge_3O_10 crystal lattice in the temperature range 80–298 K, and the linear thermal expansion coefficients have been calculated. The optical properties of the activated phases have been studied, and the influence of the dopant concentration and the excitation wavelength on the luminescence characteristics of the synthesized compounds has been established.
Особенности релаксации тензора напряжения в микроскопическом объеме нематической фазы под действием сильного электрического поля
Authors: Захаров А.В.
Published: January 2018

AbstractA numerical study of new regimes of reorientation of director field n̂ , velocity v , and components of stress tensor σ_ ij ( ij = x , y , z ) of nematic liquid crystal (LC) encapsulated in a rectangular channel under the action of a strong electric field E directed at angle $$\alpha \left( {\sim\frac{\pi } {2}} \right)$$ α ( ∼ π 2 ) to the horizontal surfaces bounding the LC channel is proposed. The numerical calculations performed in the framework of nonlinear generalization of the classical Eriksen-Leslie theory have shown that at certain relations between the torques and momenta affecting the unit LC volume and E ≫ E _th, transition periodic structures can emerge during reorientation of n̂ , if the corresponding distortion mode has the fastest response, and, thus, suppress all other modes. Rotating domains originating within this process decrease the energy dissipation rate and create more favorable regimes of the director field reorientation, as compared with the uniform rotational displacement.
Когерентный рост нитевидных нанокристаллов InP/InAsP/InP на поверхности Si(111) при молекулярно-пучковой эпитаксии
Authors: Резник Р.Р. , Цырлин Г.Э. , Штром И.В. , Хребтов А.И. , Сошников И.П. , Крыжановская Н.В. , Моисеев Э.И. , Жуков А.Е.
Published: January 2018

AbstractResults obtained in a study of the growth of InP/InAsP/InP nanowires on the Si (111) surface are presented. Using a special procedure of substrate preparation immediately before the growth made it possible to obtain a nanowire coherency with the substrate of nearly 100%. A high-intensity emission from nanostructures of this kind was observed at a wavelength of ~1.3 μm at room temperature.
Новые типы тандемных фотопреобразователей на основе сенсибилизированных и перовскитных солнечных элементов с центральным противоэлектродом
Authors: Вильданова М.Ф. , Никольская А.Б. , Козлов С.С. , Шевалеевский О.И. , Ларина Л.Л.
Published: January 2018

AbstractNovel types of tandem solar cells (TSC) based on dye-sensitized (DSC) and perovskite (PSC) solar cells including DSC/DSC and DSC/PSC configurations with a common counter electrode were fabricated and investigated. The measurements of PV parameters for tandem solar cells under AM1.5 light intensity conditions have shown that the highest power conversion efficiency (PCE) of 14.5% was obtained for the DSC/DSC tandem configuration. At the same time, investigations of DSC/PSC tandem solar cells demonstrated the prospective benefits of this tandem system for obtaining high PCE values.
Вытеснение нефти из пористой среды с использованием графитовой суспензии
Authors: Пахаруков Ю.В. , Шабиев Ф.К. , Сафаргалиев Р.Ф.
Published: January 2018

AbstractIt has been found that N aqueous suspension of planar graphite nanoparticles exhibits properties of displacement fluid at the oil–water interface. Experiments with the Hele–Shaw cell showed that the process of oil displacement from the interface is not accompanied by the formation of viscous “fingers” as a result of development of instability at the oil–water interface.
Особенности ионизации доноров кремния и рассеяние электронов в псевдоморфных квантовых ямах AlGaAs/InGaAs/GaAs при сильном одностороннем delta-легировании
Authors: Сафонов Д.А. , Виниченко А.Н. , Каргин Н.И. , Васильевский И.С.
Published: January 2018

AbstractThe influence of the concentration of silicon donors on the electron-transport properties of pseudomorphous Al_0.25Ga_0.75As/In_0.2Ga_0.8As/GaAs quantum wells (QWs) in heterostructures with heavy unilateral δ-doping by Si atoms was studied in a broad temperature interval (2.1–300 K). High electron mobility (up to 35700 cm^2/(V s)) at T = 4.2 K was observed at a 2D (sheet) electron density of 2 × 10^12 cm^–2 in the QW. A band mechanism limiting the ionization of donors at an increased level of doping is described. The nonmonotonic variation of electron mobility with increasing silicon concentration is explained. A growth in the mobility is related to increase in the Fermi momentum and screening, while the subsequent decay is caused by tunneling-induced degradation of the spacer layer with decreasing potential of the conduction band in the region of δ-Si layer. It is shown that the effect is not related to filling of the upper subband of dimensional quantization.
Экспериментальное наблюдение задержанного ударно-ионизационного пробоя полупроводниковых структур без p-n-переходов
Authors: Брылевский В.И. , Смирнова И.А. , Подольская Н.И. , Жарова Ю.А. , Родин П.Б. , Грехов И.В.
Published: January 2018

AbstractWe have experimentally studied the dynamics of impact-ionization switching in semiconductor structures without p – n junctions when subnanosecond high-voltage pulses are applied. Silicon n ^+– n – n ^+ type structures and volume ZnSe samples with planar ohmic contacts exhibit reversible avalanche switching to the conducting state within about 200 ps, which resembles the well-known phenomenon of delayed avalanche breakdown in reverse-biased p ^+– n – n ^+ diode structures. Experimental data are compared to the results of numerical simulations.
Высокотвердые наноструктурные керамико-металлические покрытия с низким уровнем макронапряжений
Authors: Блинков И.В. , Волхонский А.О. , Белов Д.С. , Сергевнин В.С. , Черногор А.В. , Киселева Т.В. , Бондарев А.В.
Published: January 2018

AbstractThe macrostressed state of (Ti,Al)N–Cu and (Ti,Al)N–Ni ceramic–metal coatings obtained by the arc-PVD method has been studied using X-ray diffraction and by measuring the radius of curvature of a coating–base composite sample (Stoney’s method). It is established that the presence of a tough metal phase favors significant reduction in the level of macrostresses in these structures as compared to those in (Ti,Al)N ceramic coatings, the absolute values of which decrease from 4.7–4.3 to 0.17–0.32 GPa. At the same time, both Ti–Al–Cu–N and Ti–Al–Ni–N coatings retain high hardness of 43 and 51 GPa, respectively, versus 29 GPa for Ti–Al–N coatings. The obtained results give grounds to suppose that the high hardness of the ceramic–metal coatings studied is determined by their nanocrystalline structure rather than by compressive macrostresses.
Синхронизация мод в лазерах спектрального диапазона 1.55 mum на основе "тонких" квантовых ям
Authors: Буяло М.С. , Гаджиев И.М. , Ильинская Н.Д. , Усикова А.А. , Новиков И.И. , Карачинский Л.Я. , Колодезный Е.С. , Бугров В.Е. , Егоров А.Ю. , Портной Е.Л.
Published: January 2018

AbstractWe present the results of an experimental study of two-section semiconductor lasers with active region consisting of three 3.1 nm InGaAs/InGaAlAs quantum wells. Passive mode-locking regime with a repetition rate of 10 GHz is realized. Different approaches have been compared to determine the stability of pulse repetition.
HEIDEGGER'SHERMENEUTICS OF BEING
Authors: Rasool Shahid
Published: January 2018

The question of Being in axio-teleological sense is of profound significance for the history culture and politics of nations, in fact, for the rise and fall of the civilizations. Heidegger brings out that man as well as nations in their greatest movement and traditions are linked to being. Their falling out of being was the most powerful and the most central cause of their decline . In fact, all philosophical questions about Being are interminability, interlinked with the meaning or goals involved in Being. The present paper will bring out the different questions and different meanings of being .
Accessibility and Applicability of Currently Available e-Mental Health Programs for Depression for People With Poststroke Aphasia: Scoping Review (Preprint)
Authors: Clunne Stephanie Jane , Ryan Brooke Jade , Hill Annie Jane , Brandenburg Caitlin , Kneebone Ian
Published: January 2018

BACKGROUND

Depression affects approximately 60% of people with aphasia 1 year post stroke and is associated with disability, lower quality of life, and mortality. Web-delivered mental health (e-mental health) programs are effective, convenient, and cost-effective for the general population and thus are increasingly used in the management of depression. However, it is unknown if such services are applicable and communicatively accessible to people with poststroke aphasia.

OBJECTIVE

The aim of this study was to identify freely available e-mental health programs for depression and determine their applicability and accessibility for people with poststroke aphasia.

METHODS

A Web-based search was conducted to identify and review freely available e-mental health programs for depression. These programs were then evaluated in terms of their (1) general features via a general evaluation tool, (2) communicative accessibility for people with aphasia via an aphasia-specific communicative accessibility evaluation tool, and (3) empirical evidence for the general population and stroke survivors with and without aphasia. The program that met the most general evaluation criteria and aphasia-specific communicative accessibility evaluation criteria was then trialed by a small subgroup of people with poststroke aphasia.

RESULTS

A total of 8 programs were identified. Of these, 4 had published evidence in support of their efficacy for use within the general population. However, no empirical evidence was identified that specifically supported any programs’ use for stroke survivors with or without aphasia. One evidence-based program scored at least 80% (16/19 and 16/20, respectively) on both the general and aphasia-specific communicative accessibility evaluation tools and was subject to a preliminary trial by 3 people with poststroke aphasia. During this trial, participants were either unable to independently use the program or gave it low usability scores on a post-trial satisfaction survey. On this basis, further evaluation was considered unwarranted.

CONCLUSIONS

Despite fulfilling majority of the general evaluation and aphasia-specific evaluation criteria, the highest rated program was still found to be unsuitable for people with poststroke aphasia. Thus, e-mental health programs require substantial redevelopment if they are likely to be useful to people with poststroke aphasia.
Title: Playing Telephone: Understanding the state of medication decision making in growing healthcare teams in the time of electronic health records (Preprint)
Authors: Mercer Kathryn , Burns Catherine , Guirguis Lisa , Chin Jessie , Dogba Maman Joyce , Dolovich Lisa , Guénette Line , Jenkins Laurie , Légaré France , McKinnon Annette , McMurray Josephine , Waked Khrystine , Grindrod Kelly Anne
Published: January 2018

BACKGROUND

Primary care needs to be patient-centred, integrated and interprofessional to help patients with complex needs manage the burden of medication-related problems. Considering the growing problem of polypharmacy, there is increasing attention on how and when medication-related decisions should be coordinated across multi-disciplinary care teams. Improved knowledge on how integrated EHRs can support interprofessional shared decision-making for medication therapy management is necessary to continue to improve patient care.

OBJECTIVE

This objective of this study was to examine how physicians and pharmacists understand and communicate patient-focused medication information with each other and how this knowledge can influence the design of electronic health records.

METHODS

This study is part of a broader cross-Canada study between patients and health care providers around how health-related decisions are made and communicated. We visited community pharmacies, team-based primary care clinics, and independent-practice family physician clinics throughout Ontario, Nova Scotia, Alberta, and Quebec. Semi-structured interviews were conducted with physician and pharmacists. A modified version of the Multidisciplinary Framework Method was used to analyze the data.

RESULTS

Data was collected at 19 pharmacies and 9 medical clinics and we identified six main themes from 34 health care professionals. Interprofessional Shared Decision Making was not occurring and clinicians made decisions based on their understanding of the patient. Physicians and pharmacists reported indirect Communication, incomplete Information specifically missing insight into indication and adherence, and misaligned Processes of Care further compounded by electronic health records not designed to facilitate collaboration. Scope of Practice examined professional and workplace boundaries for pharmacists and physicians that were internally and externally imposed. Physicians decided on the degree of the Physician/Pharmacist Relationship which was often predicated by co-location.

CONCLUSIONS

When managing medications, there was limited communication and collaboration between primary care providers and pharmacists. Pharmacists were missing key information around reason for use, and physicians required accurate information around adherence. EHRs are a potential tool to help clinicians communicate information to resolve this issue. EHRs need to be designed to facilitate interprofessional medication management, so that pharmacists and physicians move beyond task-based work toward a collaborative approach

CLINICALTRIAL

n/a
Management of the General Process of Parenteral Nutrition Using mHealth Technologies: Evaluation and Validation Study (Preprint)
Authors: Cervera Peris Mercedes , Alonso Rorís Víctor Manuel , Santos Gago Juan Manuel , Álvarez Sabucedo Luis , Wanden-Berghe Carmina , Sanz-Valero Javier
Published: January 2018

BACKGROUND

Any system applied to the control of parenteral nutrition (PN) ought to prove that the process meets the established requirements and include a repository of records to allow evaluation of the information about PN processes at any time.

OBJECTIVE

The goal of the research was to evaluate the mobile health (mHealth) app and validate its effectiveness in monitoring the management of the PN process.

METHODS

We studied the evaluation and validation of the general process of PN using an mHealth app. The units of analysis were the PN bags prepared and administered at the Son Espases University Hospital, Palma, Spain, from June 1 to September 6, 2016. For the evaluation of the app, we used the Poststudy System Usability Questionnaire and subsequent analysis with the Cronbach alpha coefficient. Validation was performed by checking the compliance of control for all operations on each of the stages (validation and transcription of the prescription, preparation, conservation, and administration) and by monitoring the operative control points and critical control points.

RESULTS

The results obtained from 387 bags were analyzed, with 30 interruptions of administration. The fulfillment of stages was 100%, including noncritical nonconformities in the storage control. The average deviation in the weight of the bags was less than 5%, and the infusion time did not present deviations greater than 1 hour.

CONCLUSIONS

The developed app successfully passed the evaluation and validation tests and was implemented to perform the monitoring procedures for the overall PN process. A new mobile solution to manage the quality and traceability of sensitive medicines such as blood-derivative drugs and hazardous drugs derived from this project is currently being deployed.
Las tecnologías de bases de datos al servicio de la metría de la información y del conocimiento científico
Authors: López Gaona Amparo , López Mendoza Salvador
Published: January 2018

En la actualidad es impensable que una organización pueda hacer uso eficiente de sus datos sin que éstos se encuentren almacenados en una base de datos. Sin embargo, éstas no siempre se crean de la mejor manera, ni utilizando un software especializado.
THE ROLE OF EVENT AND GASTRONOMIC TOURISM IN INCREASING THE EFFICIENCY OF THE REGIONAL ECONOMY
Authors: Вишневская Екатерина , Vishnevskaya Ekaterina , БОГОМАЗОВА Ирина , BOGOMAZOVA Irina
Published: January 2018

Event and gastronomic tourism in Russia has high potential and gives a lot of possibilities for tourists. The organizational and economic mechanism of organization of event - gastronomic tourism plays an important role in development of the whole tourism industry in the region. It is explained by the following: certain gastronomic events in life and history of the region can quite be para- mount travel motive; development of event-gastronomic tourism in the region allows receiving certain benefits at the regional level. With sustainable development and if there is a correct strategy for promoting event-gastronomic tourism, the tourist product including event-gastronomic events, will undoubtedly take its niche as domestic tourist product. The authors proposes the methodology of the organizational and technological process of forming the conditions for the event-gastronomic tourism development in the region. It is a cyclic process aimed at building an effective complex of event-gastronomic tourism development in the region, identifying the necessary conditions for its implementation, financing of activity in event-gastronomic tourism by regional authorities. Each tourism region has its own specifics of organizing the tourism infrastructure depending on a type of tourism developed in the territory. Nevertheless, infrastructure of the tourist region is formed proceeding from observance of the list of the typical spatial zones which are the common virtually for all tourist centers regardless of their specialization.

Article is executed within the Grant of the President of the Russian Federation for the state support of young Russian candidates of science ("Development of Competitive Advantages of Tourism to Increase the Efficiency of Regional Economy" (MK-8062.2016.6).
O direito à educação profissional na Rede Federal: novas perspectivas para a educação de jovens e adultos
Authors: Da Silva Michelle Chaves
Published: January 2018

O artigo debate o direito à educação profissional integrada à educação básica, na Modalidade Educação de Jovens e Adultos (EJA) na Rede Federal de Educação Profissional, Científica e Tecnológica (RFEPCT), em especial a experiência realizada pelas instituições federais de educação profissional na implantação do Programa Nacional de Integração da Educação Profissional com a Educação Básica na Modalidade de Educação de Jovens e Adultos (Proeja), iniciado no ano de 2006. Trata-se de pesquisa bibliográfica e documental das políticas de educação básica articulada à educação profissional destinadas às classes trabalhadoras. Nesse sentido, busca compreender, no contexto de reorganização da educação profissional no Brasil nos anos 2000, os desafios, limites e possibilidades perante o processo de inclusão educacional de jovens e adultos nos cursos e programas das instituições federais de educação profissional.