bluuebunny/crossref_metadata_2025 huggingface dataset:
Исследование изменения лигандного состава хелата Eu-=SUP=-3+-=/SUP=- методами двухступенчатого лазерного возбуждения люминесценции и компьютерного моделирования кинетики
Authors: Станишевский И.В. , Павич Т.А. , Арабей С.М.
Published: January 2019

AbstractThe europium(III)–tris(dibenzoylmethane)–triphenylphosphine oxide complex was studied in the polycrystalline state and in toluene at 298 K using the luminescence excitation method with two-stage rectangular pulses with decreasing intensity of stages. Experimental nonmonotonic kinetic curves were numerically simulated within the framework of a four-level dynamic model describing reversible processes in the complex, associated with its structural rearrangement. The maximum correspondence between the experimental and simulated curves was obtained using an iterative approximation performed using the Nelder–Mead algorithm. Based on the obtained numerical values of the rate constants and parameters of the model, experimental kinetics were interpreted, and it was concluded that they are a consequence of the processes associated with changes in the ligand composition of the Eu^3+ chelate.
Особенности локальной структуры и транспортные свойства кристаллов ZrO-=SUB=-2-=/SUB=--Sc-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=--Y-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- и ZrO-=SUB=-2-=/SUB=--Sc-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=--Yb-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=-
Authors: Борик М.А. , Волкова Т.В. , Курицина И.Е. , Ларина Н.А. , Ломонова Е.Е. , Мызина В.А. , Рябочкина П.А. , Табачкова Н.Ю.
Published: January 2019

AbstractThe specific features of the local structure of ZrO_2–Sc_2O_3–Y_2O_3 and ZrO_2–Sc_2O_3–Yb_2O_3 crystals are revealed by optical spectroscopy using the Eu^3+ ion as a spectroscopic probe. It is shown that the local structure of crystals strongly affects their transport properties.
Сравнительные исследования фотофизических свойств димегина, фотодитазина и радахлорина
Authors: Багров И.В. , Дадеко А.В. , Киселев В.М. , Муравьева Т.Д. , Стародубцев А.М.
Published: January 2019

AbstractThe photophysical properties of three photosensitizers—dimegine, photoditazine, and radachlorin—have been comparatively examined. For dimegine and photoditazine, two techniques have been used to measure the singlet oxygen generation quantum yields and the quenching constants of singlet oxygen by dimegine and photoditazine, as well as the dimegine fluorescence quantum yield.
FT-IR-спектры многослойного графена и его композиции с поверхностно-активным веществом
Authors: Денисюк И.Ю. , Логушкова К.Ю. , Фокина М.И. , Успенская М.В.
Published: January 2019

AbstractMultilayer graphene has been obtained by ultrasonic splitting of graphite microparticles in a surface-active solvent that is a mixture of nonane and water and a surface-active surfactant, which provides dispersion of graphene in hydrophilic systems, has been selected. The chemical structure of the obtained materials has been investigated by IR Fourier spectroscopy. Possible mechanisms of the influence of inorganic surfactants (sodium liquid glass) on the graphene, the type of relations that arise between it and the graphene surface, and possible areas of its application have been discussed.
Электролюминесценция одиночных InGaN/GaN микропирамид
Authors: Бабичев А.В. , Денисов Д.В. , Lavenus P. , Jacopin G. , Tchernycheva M. , Julien F.H. , Zhang H.
Published: January 2019

AbstractThe results of the fabrication of technological regimes of formation and the study of the optical properties of light emitting diodes (LED) micropyramids based on InGaN/GaN are presented. The structures were formed by the method of Metalorganic vapour-phase epitaxy. LED hetero structures based on single micropyramids demonstrate electroluminescence at a wavelength of 520–590 nm, which is shifted to the shortwave length region with increasing current pumping. These light-emission sources are of interest for the fabrication of high-intensity point light sources for biosensor applications.
Исследование фракционирования молока как типичной биологической жидкости методом цифровой голографической интерферометрии
Authors: Кузьмина Т.Б. , Андреева Н.В. , Исмагилов А.О. , Андреева О.В.
Published: January 2019

AbstractWe present the results of a study of milk as a complex biological fluid. The simultaneous occurrence of both direct and reverse sedimentation associated, respectively, with the protein and fat components of milk is demonstrated. Digital holographic interferometry enables the determination of the spatial and temporal changes in the refractive index of the suspension under study caused by fractionation processes with an accuracy of 10^–6, which exceeds the capabilities of other research methods. The results can be used to create a mathematical model of biological fluid fractionation processes and to develop physical models (phantoms) of such systems.
Модифицированный метод z-сканирования для определения нелинейности третьего порядка для квантовых точек в режиме резонансного возбуждения
Authors: Пономарева Е.А. , Скурлов И.Д. , Путилин С.Э. , Цыпкин А.Н. , Литвин А.П.
Published: January 2019

AbstractA modified Z-scan method for determining the nonlinear refractive index of colloidal quantum dots in the near-IR spectral range in the resonant excitation mode is proposed. It is demonstrated that the thermal effects related to heating of the solution due to strong light absorption can be mitigated by reducing the probing pulse repetition rate. The nonlinear refractive index of colloidal lead sulfide quantum dots is found to be on the order of 10^–16 cm^2/W.
Фотоэлектрические свойства композитных слоев Si с наночастицами Ag, полученных ионной имплантацией и лазерным отжигом
Authors: Баталов Р.И. , Нуждин В.И. , Валеев В.Ф. , Нургазизов Н.И. , Бухараев А.А. , Ивлев Г.Д. , Степанов А.Л.
Published: January 2019

AbstractStructural and photoelectric properties of composite Ag:Si layers formed in the near-surface area of a single-crystal c-Si substrate by a high-dose implantation of Ag^+ ions with subsequent pulsed laser annealing (PLA) have been studied. It has been established that, as a result of ion implantation, a maximal concentration of Ag impurity ( N _Ag ~ 4 × 10^22 at/cm^3) is concentrated near the surface and drops to a level of ~10^19 at/cm^3 at a depth of ~60 nm. Meanwhile, Ag nanoparticles and silver oxide (Ag_2O) inclusions are contained in a formed thin layer of amorphized Si (a-Si). Melting of a near-surface area and diffusion redistribution of the implanted impurity have been achieved in conditions of PLA, which increases Ag concentration near the surface and at a depth of 60 nm. Dark current–voltage characteristics of a junction between a Ag:Si layer and a p -Si substrate showed formation of a diode structure as a result of PLA. Photoconductivity measurements on formed samples demonstrate the presence of a photoresponse (photo-EMF) in the range of wavelengths of 500–1200 nm, which intensity increased for samples that are subjected to PLA when increasing energy density in the pulse. The obtained results demonstrate the potential use of composite Ag:Si layers and the method of their formation in the technology of photodetectors.
Оптические свойства нанокластеров серебра, синтезированных в поверхностно-привитой полиакриловой кислоте при разных плотностях прививки
Authors: Горбачев А.А. , Сушко Н.И. , Першукевич П.П. , Третинников О.Н.
Published: January 2019

AbstractFluorescent silver nanoclusters immobilized on a plastic substrate are obtained by photoinduced template synthesis using polyacrylic acid chemically grafted to the substrate surface as a template. The electronic absorption and fluorescence spectra of nanoclusters are studied depending on the polyacrylic acid grafting density. It is found that the optical absorption and fluorescence intensities of nanoclusters monotonically increase with increasing grafting density. The position and shape of the absorption and emission spectra almost do not change. The higher the polymer template grafting density, the higher the fluorescence stability of samples during storage at room temperature.
Дисперсия объемных волн в структуре "графен--диэлектрик--графен"
Authors: Абрамов А.С. , Евсеев Д.А. , Золотовский И.О. , Семенцов Д.И.
Published: January 2019

AbstractWe investigate the dispersion properties of the first waveguide modes in a dielectric film that is coated with graphene layers having different chemical potential values. The control over the phase and group velocities of the first waveguide mode is considered. Spectral intervals in which the phase velocity of the waveguide modes is small, while their group velocity is negative, are revealed. We show that the dispersion characteristics of the waveguide modes can be rearranged using an external electric field.
Исследование эффекта влияния временной задержки термической связи на синхронизацию VO-=SUB=-2-=/SUB=--осцилляторов
Authors: Величко А.А. , Беляев М.А.
Published: January 2019

Abstract—The effect of the time delay of thermal coupling on the synchronization of two VO_2-oscillators has been studied for the first time. A modification of the methods for determining high order synchronization parameters has been proposed. The dependence of these parameters on the magnitude of the time delay and distance between the oscillators in the presence of internal noise has been studied. The results will contribute to the development of technology for creating three-dimensional neural networks.
Формирование слабых особенностей на поверхности диэлектрической жидкости в тангенциальном электрическом поле
Authors: Кочурин Е.А.
Published: January 2019

AbstractThe process of interaction between nonlinear waves on a free surface of a nonconducting fluid in a strong tangential electric field is simulated numerically (effects of the force of gravity and capillarity are neglected). It is shown that singular points are formed at the fluid boundary in a finite time; at these points, the boundary curvature significantly increases and undergoes a discontinuity. The amplitude and slope angles of the boundary remain small. The singular behavior of the system is demonstrated by spectral functions of the fluid surface—they acquire a power dependence. Near the singularity, the boundary curvature demonstrates a self-similar behavior typical for weak root singularities.
Оптический эффект вращения плоскости поляризации света в ДНК-содержащих материалах
Authors: Каманина Н.В. , Каманин А.А. , Лихоманова С.В.
Published: January 2019

AbstractUsing the example of DNA water solutions, a manifestation of the light polarization plane rotation effect has been shown (in comparison with a number of dyes). Numerical values of the rotation angle have been established that significantly exceed those for water solutions of dyes and sugar traditionally used in saccharimeters and polarimeters. Therefore, another optical effect in biostructuring optical materials has been identified and confirmed.
Экспериментальное определение поля радиальных перемещений в шейке образцов после испытания на растяжение
Authors: Быков А.А. , Буртелова Н.В. , Молчанов В.С.
Published: January 2019

AbstractThis Letter presents the results of a study of the radial displacement fields arising upon stretching of cylindrical samples before their disintegration. The object of study was sv-07Kh16N6 stainless steel wire containing filiform defects oriented along the sample axis. Using X-ray tomography of the sample necks, the coordinates of the defect points in the sample are determined and the displacement field is recovered from them. The resulting dependence is represented by an approximate formula.
Анализ структуры многослойных нанокристаллических покрытий на основе параметров массопереноса плазмы, вычисленных методом Монте-Карло
Authors: Черногор А.В. , Блинков И.В. , Белов Д.С. , Сергевнин В.С. , Волхонский А.О.
Published: January 2019

AbstractThe results of the simulation of plasma fluxes onto the surface of rotating substrates during the combustion of a vacuum arc of the Cr–Ti–Mo cathode system are presented. The structure and composition of the arc-PVD Ti_0.15Cr_0.74Mo_0.11N_0.84 coatings are experimentally studied. The numerical simulation results of the coating structures based on experimental data were analyzed. The possibility of the simulation of the structure of multilayer, multicomponent coatings and the concentration distribution of chemical elements and its components is shown by calculating the plasma fluxes using the Monte Carlo method.
Определение некоторых параметров фотолюминесценции соединения Ca(Al-=SUB=-x-=/SUB=-Ga-=SUB=-1-x-=/SUB=-)-=SUB=-2-=/SUB=-S-=SUB=-4-=/SUB=- : Eu-=SUP=-2+-=/SUP=-
Authors: Асадов Е.Г. , Гаджиева Г.С. , Мамедов А.Н. , Казымова Ф.А. , Ибрагимова Т.Ш. , Тагиев К.О.
Published: January 2019

AbstractWe synthesized a solid solution of Ca(Al_ x Ga_1 – x )_2S_4 activated with europium ions Eu^2+. The photoluminescence spectra and photoluminescence excitation spectra of the crystals at 300 K for x = 0.2 are measured. The dependence of the luminescence intensity on the temperature in the range of 10–300 K is investigated. Based on the experimental results, the redshift, the Stokes shift, the activation energy, and the lifetime of the Eu^2+ ions are determined.
Внутреннее трение на границах зерен, содержащих протяженные поры
Authors: Кульков В.Г. , Сыщиков А.А.
Published: January 2019

AbstractA model of internal friction at a grain boundary containing equidistant parallel cylindrical pores is presented. Variable shear stress induces a mutual displacement of the interfacial regions matched at the segments between pores depending on their position. The values of scattered energy at each segment and total internal friction are determined. The temperature dependence of the internal friction has a form of a wide peak.
Стабильные многослойные отражающие покрытия на длину волны lambda(HeI) = 58.4 nm для солнечного телескопа проекта КОРТЕС
Authors: Полковников В.Н. , Чхало Н.И. , Meltchakov E. , Delmotte F. , Зуев С.Ю. , Салащенко Н.Н. , Свечников М.В. , Цыбин Н.Н.
Published: January 2019

AbstractMultilayer aluminum-based structures reflecting at λ(HeI) = 58.4 nm were studied. Spectral and angular dependences of the reflection coefficient of these coatings were determined using a laboratory reflectometer and at the ELETTRA and BESSY II synchrotrons. The optical characteristics of multilayer Ru/Al and Mo/Al mirrors with a protective MoSi_2 layer were found to be stable: the absolute change in the reflection coefficient within 18 months of storage in air was no larger than 1.5%. The peak near-normal reflection coefficient for Mo/Al mirrors at 58.4 nm was R = 26.1% with FWHM Δλ_0.5 = 10 nm of the reflection curve.
Контракция микроволнового разряда в реакторе для газофазного осаждения алмаза
Authors: Богданов С.А. , Горбачев А.М. , Радищев Д.Б. , Вихарев А.Л. , Лобаев М.А.
Published: January 2019

AbstractIt was found that in a hydrogen-methane mixture in microwave plasma reactor for diamond deposition, there is a threshold pressure after which the contraction of microwave discharge occurs. The results of measurements of gas temperature and spatial distributions of optical emission intensity of discharge are presented. The mechanism of discharge contraction is discussed.
Высоковольтный импульсный источник для питания холодных плазменных струй
Authors: Мошкунов С.И. , Хомич В.Ю. , Шершунова Е.А.
Published: January 2019

AbstractThe parameters of a number of high-voltage solid-state switches are studied. Based on the analysis of their work, a high-voltage pulse source with a size of 105 × 260 × 180 mm is assembled to supply cold plasma jets operating at the ac voltage of 220 V, 50 Hz.
Твердофазная эпитаксия пленок BiFeO-=SUB=-3-=/SUB=- с магнитоэлектрическими свойствами на сапфире
Authors: Муслимов А.Э. , Буташин А.В. , Каневский В.М.
Published: January 2019

AbstractThe ferroelectric domain structure has been investigated in bismuth-ferrite rhombohedral phase films prepared on the rhombohedral plane of sapphire by solid-phase epitaxy. The piezoelectric modulus has been estimated to be d _33 ~ 2 pm/V. In films of the Bi_25FeO_39–BiFeO_3 and Bi_2Fe_4O_9–BiFeO_3 systems on sapphire, the magnetoelectric-switching effect has been observed in bismuth ferrite crystallites without deposition of exchange-coupled layers. The values of the magnetic moment in bismuth ferrite microcrystallites have been estimated.
Особенности нелинейной диффузии сильного импульсного магнитного поля вблизи края проводника
Authors: Кривошеев С.И. , Магазинов С.Г. , Шнеерсон Г.А.
Published: January 2019

AbstractThe nonlinear diffusion of a strong magnetic field to a conductor with the boundaries forming a right dihedral angle has been considered. In a transverse field with induction oriented perpendicular to the angle edge, the current density is maximum in the conductor bulk rather than near the edge (as for linear diffusion). In a longitudinal field with induction oriented parallel to the edge, the current density at the vertex of the angle at the strong-field diffusion is zero (as in a weak field); however, the maxima of the current density, temperature, and Lorentz force shift to the conductor bulk with an increase in the field strength.
Влияние границ зерен на устойчивость нанокластеров алюминия
Authors: Векман А.В. , Демьянов Б.Ф.
Published: January 2019

AbstractThe resilience of nanoclusters surrounded by a perfect crystal matrix has been studied via the molecular dynamics approaches. Clusters with sizes of up to 10 nm are found to be unstable and dissolve in the matrix.
Синтез легированного кислородом графитоподобного нитрида углерода из тиомочевины
Authors: Денисов Н.М. , Чубенко Е.Б. , Бондаренко В.П. , Борисенко В.Е.
Published: January 2019

AbstractWe have synthesized oxygen-doped graphite-like carbon nitride (g-C_3N_4) by the thermal treatment of the thiourea at 450–550°C. With an increase in the annealing temperature, the oxygen concentration in g-C_3N_4 increases, and the band-gap of the material decreases from 2.64 to 2.47 eV. The semiconductor properties of g-C_3N_4 doped with oxygen are confirmed by its high photocatalytic activity, determined by decoloration of a Rhodamine B aqueous solution in the presence of g-C_3N_4 upon irradiation with visible light.
Применение эмпирических потенциалов для расчета упругих свойств графена
Authors: Минкин А.С. , Лебедева И.В. , Попов А.М. , Книжник А.А.
Published: January 2019

AbstractThe elastic properties of a flat graphene layer calculated using the classical empirical Tersoff, Brenner, AIREBO, PPBE-G, and LCBOP potentials have been compared. It is shown that, although the popular Brenner and AIREBO potentials have been developed formally taking into account the elastic properties of graphene, they give significant discrepancies in the values of Young’s modulus and Poisson’s ratio. Among the potentials under consideration, the LCBOP potential yields the values of these parameters that are closest to experimental data and results of ab initio calculations in the limit of zero elongation. For the quantitative simulation of mechanical phenomena in graphene-based systems, the potential parameters should be fitted to reproduce elastic properties of graphene completely taking into account system deformations and dependences of these constants on the elongation.
Влияние низкотемпературной термообработки на развитие сверхэластичности в монокристаллах Ti-50.6 at.% Ni
Authors: Тимофеева Е.Е. , Суриков Н.Ю. , Тагильцев А.И. , Ефтифеева А.С. , Тохметова А.Б. , Янушоните Э.И. , Панченко Е.Ю. , Чумляков Ю.И.
Published: January 2019

AbstractAs a result of low-temperature aging at 573 K for 1.5 h of Ti–50.6 at% Ni [001]-oriented single crystals quenched from 1253 K, a high-strength state is obtained due to the precipitation of Ti_3Ni_4 nanoscale particles ( d < 10 nm). The aging leads to the development of the B 2– B 19' martensitic transformation through an intermediate R phase, a reduction in the B 19' martensite formation temperatures by 40–60 K, an increase in the strength properties of the B 2 phase from 730 to 2100 MPa, and an extension of the superelasticity interval Δ T _SE in compression from Δ T _SE = 60 to 170 K (compared to quenched crystals).
Модель ускорения лазерной плазмы в полях спиральной электродинамической линии
Authors: Шиканов А.Е. , Вовченко Е.Д. , Козловский К.И. , Шатохин В.Л.
Published: January 2019

Abstract—The acceleration of a plasmoid, for the formation of which a conical spiral expanding in the direction of the expected plasma acceleration is used, in a rapidly increasing magnetic field of complex geometry has been considered. An algorithm for calculating the longitudinal magnetic field in the approximation of replacing a spiral line with a system of rings of variable radius has been presented. A mathematical model that is based on the interaction of the plasmoid magnetic moment with gradient of the longitudinal magnetic field decay has been proposed to analyze the efficiency of the acceleration. The possibility of deuterons reaching an average speed exceeding 10^6 m/s has been shown.
Ионно-электронная рекомбинация и тепловые потоки в высокочастотных ионных двигателях
Authors: Абгарян В.К. , Гидаспов В.Ю. , Надирадзе А.Б. , Семенов А.А.
Published: January 2019

AbstractHeat fluxes emitted from plasma to the surface of structural elements of high-frequency (HF) ion thrusters with perforated electrodes of the ion-optical system have been studied. Radiation fluxes formed during ion–electron recombination on surfaces in contact with plasma are considered taking into account their spatial distribution and partial reflection from surfaces. New expressions for the heat fluxes are obtained that should be used as boundary conditions in numerical models for the calculation of temperature fields in HF ion thrusters.
Метод демультиплексирования геликоидального волнового фронта
Authors: Станкевич Д.А.
Published: January 2019

AbstractMachine learning methods were used to construct a demultiplexer for helical wave front separation into orthogonal modes. The accuracy of wave front demultiplexing into eight modes at a signal-to-noise ratio of –3 dB is about 95% in a broad range of signal carrier frequencies. For nonstationary parameters of signals, the proposed demultiplexer accuracy exceeds that of the classical correlation method.
Распознавание движений руки по сигналам электроэнцефалограммы на основе флуктуационного анализа
Authors: Павлов А.Н. , Руннова А.Е. , Максименко В.А. , Павлова О.Н. , Гришина Д.С. , Храмов А.Е.
Published: January 2019

AbstractWe consider the task of recognition of fragments of multichannel electroencephalogram (EEG) records corresponding to motions of the human arm and to mental representation of these motions. It is shown that the problem of recognition can be solved by processing short EEG segments by the method of fluctuation analysis. The obtained results suggest that fluctuation analysis can be used as an algorithm of the digital signal processing in development of the neurointerface software.
Оптоэлектронный двухволновый метод для дистанционного контроля содержания метана в атмосфере
Authors: Абдурахмонов С.М. , Кулдашов О.Х. , Тожибоев И.Т. , Тургунов Б.Х.
Published: January 2019

AbstractsThe optoelectronic two-wave method has been developed and a block scheme of the corresponding optoelectronic device has been proposed for remote monitoring of the content of methane in atmosphere. The optoelectronic device employs light-emitting diodes (LEDs) based on GaAlAsSb/GaInAsSb/GaAlAsSb (3.12 μm) and GaAlAsSb/GaInAsSb/GaAlAsSb (3.39 μm) structures as the sources of reference and probing radiation, respectively.
Преобразование частоты излучения мощных гиротронов в условиях обратного рамановского рассеяния на дополнительном электронном пучке
Authors: Гинзбург Н.С. , Юровский Л.А. , Зотова И.В. , Сергеев А.С.
Published: January 2019

AbstractThe regime of Raman backscattering of a pumping wave that is cocurrent with an electron beam into the counterpropagating wave can be used for the radiation frequency conversion in high-power gyrotrons. The absolute instability developing in this system ensures generation of a scattered signal in the absence of external resonators, which allows the frequency of scattered radiation to be smoothly controlled within 20–40% by varying the electron energy in the case of high-power (megawatt) gyrotrons used as sources of pumping radiation.
Сканирующая ближнепольная оптическая наноспектрофотометрия: метод наномасштабного измерения спектров поглощения единичных нанообъектов
Authors: Мoчалов К.Е. , Соловьева Д.О. , Васкан И.С. , Набиев И.Р.
Published: January 2019

AbstractA new experimental method for nanoscale measurements of the absorption spectra of single nanoobjects has been developed based on scanning near-field optical microspectroscopy (SNOM) and nanospectrophotometry (NSP). The main distinctive feature of the proposed SNOM-NSP technique consists in depositing a sample onto a coverglass followed by its probing in the total internal reflection spectroscopy mode. This approach allows the number of analyzed samples to be significantly increased and provides the possibility of combining measurements with other optical techniques. The proposed SNOM-NSP method has been successfully used for studying single plasmonic nanoparticles and their complexes with Rhodamine 6G dye.
Эффект электроформовки в поликристаллических пленках фуллерена С-=SUB=-60-=/SUB=-
Authors: Захарова И.Б. , Долженко Д.И. , Бородзюля В.Ф. , Сударь Н.Т.
Published: January 2019

AbstractLong-term exposure of a polycrystalline fullerene C_60 film in a constant electric field of 1–4 MV/cm produces an electroforming effect manifested by increase in conductivity of the film within several orders of magnitude. After this electroforming, the current–voltage ( I – U ) characteristic shows a high degree of current stability and reproducibility of results. In fields of 10^5–10^6 V/cm, the I – U characteristics of electroformed films are determined by the space-charge limited current. The concentration ( N _ t ≈ 4 × 10^21 m^–3) of carrier traps and their energy ( E _ t ≈ 0.176 eV) have been estimated.
Дефекты с глубокими уровнями в фотоэлектрическом преобразователе с антиотражающей пленкой пористого кремния, сформированной окрашивающим химическим травлением
Authors: Трегулов В.В. , Литвинов В.Г. , Ермачихин А.В.
Published: January 2019

AbstractDefects in the semiconductor structure of a photovoltaic converter (PVC) with a p – n junction and antireflection film of porous silicon manufactured using chemical stain etching were studied by the current deep-level transient spectroscopy technique. The influence of the regime of porous silicon film formation on the transformation of deep-level defects and the main PVC characteristics is explained.
Влияние объемного заряда на перенос заряженных частиц, генерируемых при электрораспылении в скрещенных газодинамическом и электрическом полях
Authors: Громов И.А. , Самсонова Н.С. , Галль Н.Р.
Published: January 2019

AbstractThe transport of charged particles generated during electrospray in a longitudinal gasdynamic field has been studied in a model system comprising two coaxial electrodes and a collector grid. The process has been numerically simulated with omission of the role of a space charge. A comparison of the results shows that the space charge is a key factor determining the transport of charged particles: the model transport efficiency in the absence of space charge reaches 80–100%. In experiment, the efficiency strongly depends on the space charge and amounts to 70–80% for its minimum values, while decreasing to 20–30% with increasing electrospray current.
Гетероструктура BaTiO-=SUB=-3-=/SUB=-/LaSrMnO-=SUB=-3-=/SUB=- на сапфире для сегнетоэлектрических туннельных переходов
Authors: Гагарин А.Г. , Тумаркин А.В. , Сапего Е.Н. , Кункель Т.С. , Стожаров В.М.
Published: January 2019

AbstractBaTiO_3/LaSrMnO_3 (BTO/LSMO) structures with a ferroelectric layer thickness of 10 nm have been formed on r -cut sapphire substrate by means of high-frequency magnetron sputtering. Investigations of the sample structure showed the presence of a crystalline phase, while measurements of electrical properties revealed piezoelectric response of the BTO films. The study of local current–voltage characteristics showed dependence of the sample resistance on the prehistory of voltage application as determined by ferroelectric hysteresis of the BTO layer.
Электронная микроскопия и элементный состав приповерхностного слоя кристаллов LiF, облученных электронами
Authors: Муссаева М.А. , Ибрагимова Э.М.
Published: January 2019

AbstractElectron microscopy and optical vibrational spectroscopy techniques have been used to study Li nanoparticles formed on the cleaved surface of lithium fluoride (LiF) crystals irradiated by 4-MeV electron beam to a total fluence of 5 × 10^16 cm^–2. It is suggested that ionization accompanying this intense irradiation leads to radiolysis of the target and removal of fluorine from interblock boundaries, where lithium cations are collected and mutually oriented to form microwires. This functional surface may be of practical interest.
Рост нанотрубок и нитевидных нанокристаллов GaN с катализатором Au-Ni
Authors: Сибирев Н.В. , Huang H. , Убыйвовк Е.В. , Lv R. , Zhao D. , Guang Q. , Бердников Ю.С. , Yan X. , Корякин А.А. , Штром И.В.
Published: January 2019

AbstractArrays of GaN nanowires (NWs) and nanotubes (NTs) have been grown by metalorganic vapor phase epitaxy using a gold–nickel film as the catalyst. The simultaneous formation of both NTs and NWs in one process in the presence of various Au–Ni catalyst compositions is explained. It is established that NTs grow on solid catalyst particles, while NWs grow according to the classical vapor–liquid–solid mechanism. The optoelectronic properties of obtained NTs and NWs have been studied using photo- and cathodoluminescence techniques.
Лазеры на основе квантовых яма-точек, излучающие в оптических диапазонах 980 и 1080 nm
Authors: Надточий А.М. , Минтаиров С.А. , Калюжный Н.А. , Шерняков Ю.М. , Корнышов Г.О. , Серин А.А. , Паюсов А.С. , Неведомский В.Н. , Гордеев Н.Ю. , Максимов М.В. , Жуков А.Е.
Published: January 2019

AbstractThe main characteristics of edge-emitting lasers with active regions based on nanoheterostructures of a new type—quantum well-dots (QWDs) operating at various wavelengths—are compared. The QWD structures operating at 980- and 1080-nm wavelengths demonstrated minimum values of threshold current density (160 and 125 A/cm^2), high internal quantum efficiency (74 and 85%), and low internal losses (1.1 and 0.9 cm^–1), respectively.
Нанокластеры гидроксиапатита в субэндотелиальных структурах полулуний аорты у пациентов с кальцинированным аортальным стенозом
Authors: Ястребов С.Г. , Гуляев Н.И. , Галенко А.С. , Прус М. , Сиклицкая А.В.
Published: January 2019

AbstractWe have studied X-ray diffraction (XRD) patterns of calcinates isolated from aortic demilunes of patients with calcific aortic stenosis. It is shown that the observed XRD pattern is formed by spherical formations of hexagonal hydroxyapatite with diameters distributed according to the lognormal law. A model of the structure of these formations is constructed and the possible mechanisms of their nucleation and encapsulation of hydroxyapatite particles in the restricted porous space of the basal membrane of aortic valve demilunes are discussed.
Контролируемый синтез графена на меди с использованием метода имплантации атомов отдачи углерода
Authors: Вяткин А.Ф.
Published: January 2019

AbstractA method of graphene synthesis on the surface of copper foil by cold implantation of carbon recoil atoms is considered. It is established that monolayer graphene films are formed on the surface of carbon-implanted copper foil under certain conditions (annealing temperature and duration, cooling rate) of postimplantation processing.
Изучение характеристик транзисторов на гетероструктурах нитрида галлия, выращенных методом аммиачной молекулярно-лучевой эпитаксии на подложках сапфира и кремния
Authors: Андреев А.А. , Грищенко Ю.В. , Езубченко И.C. , Черных М.Я. , Колобкова Е.М. , Майборода И.О. , Черных И.А. , Занавескин М.Л.
Published: January 2019

AbstractsAmmonia molecular-beam epitaxy has been used to grow gallium nitride (GaN) transistor heterostructures on sapphire and silicon substrates. GaN transistors with a 1.2-mm periphery fabricated on substrates of both types exhibited similar high static characteristics: saturation current density above 0.75 A/mm, transconductance above 300 mS/mm, and breakdown voltage above 120 V. Measurements of the small-signal parameters showed that transistors based on silicon substrates possessed high gain in a frequency range up to 5 GHz; the specific output power at 1 GHz amounted to 5 W/mm for transistors on sapphire substrate and 2 W/mm for transistors on silicon substrate.
Лазерное возбуждение крутильных колебаний волоконных микросветоводов
Authors: Егоров Ф.А. , Потапов В.Т.
Published: January 2019

AbstractComparative analysis of mechanisms of the laser excitation of torsional vibration modes in optical microfibers shows that special attention should be devoted to the Sadovsky effect manifested in polarization-anisotropic optical microfibers. Estimations of the efficiency of this mechanism for the excitation of torsional vibrations and polarization modulation in the proposed types of anisotropic quartz microfibers shows the possibility of creating new types of polarization elements—optically controlled fiber polarization devices and sensitive elements for resonance fiber-optic sensors.
Влияние морфологии поверхности слоев InAlAs на температурные зависимости параметров диодов Шоттки Au/Ti/n-InAlAs (001)
Authors: Чистохин И.Б. , Аксенов М.С. , Валишева Н.А. , Дмитриев Д.В. , Марчишин И.В. , Торопов А.И. , Журавлев К.С.
Published: January 2019

AbstractGrowth-related structural defects present on the surface of InAlAs layers grown by molecular beam epitaxy on InP(001) substrates influence the temperature dependences of the current–voltage characteristics of Au/Ti/InAlAs Schottky barriers. It is established that these defects in the form of pits cause the appearance of regions with reduced barrier height. At a surface density of ≥10^7 cm^–2, these defects significantly influence the parameters of the Schottky barriers at temperatures below 200 K.
Improving Nutrition and Activity Behaviors Using Digital Technology and Tailored Feedback: Protocol for the Tailored Diet and Activity (ToDAy) Randomized Controlled Trial
Authors: Halse Rhiannon E , Shoneye Charlene L , Pollard Christina M , Jancey Jonine , Scott Jane A , Pratt Iain S , Dhaliwal Satvinder S , Norman Richard , Straker Leon M , Boushey Carol J , Delp Edward J , Zhu Fengqing , Harray Amelia J , Szybiak Maria A , Finch Anne , McVeigh Joanne A , Mullan Barbara , Collins Clare E , Mukhtar Syed Aqif , Edwards Kieran N , Healy Janelle D , Kerr Deborah A
Published: January 2019

Background

Excess weight is a major risk factor for chronic diseases. In Australia, over 60% of adults are overweight or obese. The overconsumption of energy-dense nutrient-poor (EDNP) foods and low physical activity (PA) levels are key factors contributing to population obesity. New cost-effective approaches to improve population diet and PA behaviors are needed.

Objective

This 1-year randomized controlled trial (6-month intervention and 6-month follow-up) aims to investigate whether a tailored intervention using mobile technology can improve diet and PA behaviors leading to weight loss in adults (aged 18-65 years) who are overweight or obese and recruited through a social marketing campaign (LiveLighter).

Methods

All eligible participants will provide data on demographics and lifestyle behaviors online at baseline, 6 months, and 12 months. Using two-stage randomization, participants will be allocated into one of three conditions (n=200 per group): tailored feedback delivered via email at seven time points, informed by objective dietary (mobile food record app) and activity (wearable activity monitor) assessment; active control receiving no tailored feedback, but undergoing the same objective assessments as tailored feedback; and online control receiving no tailored feedback or objective assessments. Primary outcome measures at 6 and 12 months are changes in body mass, EDNP food and beverage consumption, and daily moderate-to-vigorous PA (measured via accelerometry). Secondary outcomes include change in fruit and vegetable consumption, daily sedentary behaviors, and cost effectiveness.

Results

Enrolment commenced in August 2017. Primary outcomes at 12 months will be available for analysis from September 2019.

Conclusions

Tailored email feedback provided to individuals may deliver a cost-effective strategy to overcome existing barriers to improving diet and PA. If found to be successful and cost effective, upscaling this intervention for inclusion in larger-scale interventions is highly feasible.

Trial Registration

Australian New Zealand Clinical Trials Registry ACTRN12617000554369; https://www.anzctr.org.au /Trial/Registration/TrialReview.aspx?id=371325&isReview=true

International Registered Report Identifier (IRRID)

DERR1-10.2196/12782
Feasibility and Acceptability of a Mental Health Website for Adults With an Intellectual Disability: Qualitative Evaluation
Authors: Watfern Chloe , Heck Chloe , Rule Chris , Baldwin Peter , Boydell Katherine M
Published: January 2019

Background

Electronic mental health (e-mental health) programs for people with an intellectual disability are currently underexplored but may provide a way of mitigating some of the barriers that this population faces in accessing appropriate mental health services.

Objective

The aim of this study was to examine the feasibility and acceptability of Healthy Mind, an e-mental health program for adults with an intellectual disability developed by the Black Dog Institute, focusing on the design and implementation of the website.

Methods

A qualitative research design was used, which involved semistructured interviews and focus groups with people with an intellectual disability, support workers, and allied health professionals. People with an intellectual disability were also observed while using the website. A thematic analysis was used to interrogate the interview transcripts and observational field notes.

Results

Participants found the content of the website informative and appreciated the many ways that the website had been made accessible to users. Participants voiced some differing requirements regarding the way information should be presented and accessed on the website. Acknowledging different types of support needs was identified as an important issue for website dissemination.

Conclusions

The Healthy Mind website promises to provide an excellent tool for people with ID and their supporters. This research has pragmatic implications for the future development and implementation of the program, while contributing to knowledge in the broader fields of e-mental health and inclusive design for people with an intellectual disability.
Seaweed Selection to Supply Superior Seeds for Cultivation
Authors: Sarira Nelly Hidayanti , Pong-Masak Petrus Rani
Published: January 2019

Seaweed Kappaphycus alvarezii is a pre-eminent commodity in the field of marine and fisheries Indonesia which has been widely cultivated in coastal waters. Currently, the main problem faced by the cultivators is the limited stock of seeds, both in terms of quality and quantity. Selection is one method that is expected to increase the rate of seaweed growth quickly, cheap, easy, bulk, and sustainable.This study aims to determine the effect of selection on the growth of seaweed so that it can be done superior seed production for cultivation purposes. Seaweed cultivation was done in Kulu Village, Wori District, North Minahasa Regency, North Sulawesi by using long line method in April-June 2015. Selection is based on the daily growth rate parameter (DGR) and the selection method refers to the selection protocol that has been developed on K. alvarezii seaweed. Results showed that DGR of selection seedlings were higher (P <0.05) compared to controls, in which DGR of selection reached 5.87%/day, while DGR of control was 1.89%/day. From three seed production cycles (G-1 - G-3), the average DGR resulted from the selection was 5.53%/day and control 2.19%/day. Carrageenan content of selection result is relatively higher (47.66%) than control (31.28%) with mean for three cycle (G-1 - G-3) that is 43.55% for selection and 33.20% for control. Water quality (temperature, salinity, nitrate, phosphate) during the study is still within the appropriate range for seaweed growth. Therefore it is concluded that with the application of the method of seaweed selection can increase the daily growth rate and carrageenan content of seaweed K. alvarezii which directly affects the increase of production both in quantity and quality.
Agricultural Raw Materials and the Emergence of Agri-Food Industry in Côte d’Ivoire
Authors: Coulibaly Noufou , Magloire Yapi Yapo , Siaka Kone , Mardochée Kouassi Yao Daniel
Published: January 2019

The agricultural sector in Côte d’Ivoire still faces difficulties like, low modernization, low yield, low rate of processing, poor marketing, despite the government efforts in the Agri-Food Industries (AFIs). The purpose of this study was to assess if local agricultural products were sufficiently used as raw materials by the AFIs. The Leontief model was used to estimate vertical and horizontal coefficients, based on data from the 2013 employment resources table of the ivorian economy, in order to appreciate the dependence on raw materials supply, between agricultural sector, the AFIs and the international market. This study showed that, the ivorian AFIs were weakly dependent on the external market (20%). Despite the large supply capacity of the agricultural products (about 95%), very few were used as raw materials (5 to 15%) by agro-food industries because of the weak industrial fabric, due to several constraints as the hostile administrative and political environment and the lack of industrial culture. The processing rate was estimated at 5% for cashew, 15% for cocoa and coffee and less than 1% for food crops. We identified the determinants for the emergence of an efficient industrial fabric namely healthy business climate, a prerequisite for attracting domestic and international investors.
The Politics of Mathematics: Just and Knowing Societies
Authors: Baldwin Sandra , Squires Vicki
Published: January 2019

Educational leaders and researchers recognize that mathematics can be an effective tool in enabling substantial advances in many fields of science and technology. However, the role that mathematics can play in shaping and creating socio-political views of societies is not as well understood. Within the mathematics’ learning community there is little discussion connecting the unique role that mathematics can play in conceptualizing a democratic society even within the democratic societies where that learning happens. Building capacity for learning in context is a critical piece of any comprehensive program but it is sometimes difficult for leaders to agree on what that context should and does look like. There are multitudes of influences at play when educational systems create and enact curricula but in order to push through the stalemate that can exist with different ideologies, it is essential to understand that mathematics can be a conduit to improvements in political social justice as well as a gateway to developments in science and technology. Mathematics has the potential to be a tool to create, as well as an instrument of influence; the key is for leaders to understand how to do both.
Cambios sociales y evaluación de la educación en México. El caso de la lectura.
Authors: Nicolás Cisneros Silvia , Martínez Castro Alma Lucía , Pérez Maya Coralia
Published: January 2019

A partir de la lectura de documentos oficiales, se reflexiona sobre los cambios que ha presentado el Estado mexicano, para asumirse actualmente como un estado evaluador; la participación de la Organización de Cooperación para el Desarrollo Económico (OCDE), en el diagnóstico sobre la educación en México, y la aplicación del Programa Internacional de Evaluación de Estudiantes (PISA), sus resultados y la respuesta que da el gobierno en la generación de estrategias para cambiar aptitudes de lectura de la población mexicana.

Se presentan resultados de una encuesta aplicada en el 2005, por la Procuraduría Federal del Consumidor (Profeco), para identificar cómo, a ocho años del diagnóstico de la OCDE (1997) Y a cinco de la aplicación del PISA (2000), con énfasis en la lectura, la población sigue presentando resultados negativos.

La propuesta es ya no esperar políticas públicas, ante esta necesidad urgente, adoptar una actitud reflexiva y responsable con nosotros mismos y la población con la que nos relacionamos, ya sea por razones laborales o familiares; con la certidumbre de que somos capaces de construir mejores mañanas.
La Asociación Mexicana de Enfermeras en Nefrología A.C.
Authors: Jiménez Mendoza Araceli , Paz Martínez Guadalupe , Gómez Torres Patricia , García Vargas Marina R.
Published: January 2019

La Asociación Mexicana de Enfermeras en Nefrología A.C. (AMENAC) ha sido creada con el objetivo de elevar los conocimientos de todas la Enfermeras (os) que se desempeñan profesionalmente en centros de Atención Especializada en Nefrología, para mejorar la Calidad de Vida de las personas con alteraciones renales.

Esta Asociación fue fundada y constituida en 1986 por Enfermeras Mexicanas. Cada bienio se lleva a cabo el cambio de mesa directiva y se elabora un programa de actividades científicas, sociales y culturales que contribuyan en el fomento del liderazgo de la Enfermería en Nefrología.

Las actividades que se desarrollan en el período de cada gestión son: Cursos Regionales, Congresos Nacionales e Internacionales, actividades académicas en coordinación con Instituciones Universitarias y difusión de eventos sociales y culturales para el profesional de Enfermería.
Evaluación de la calidad de la atención de Enfermería en el Hospital de Santa Fe: un estudio basado en la opinión del personal de Enfermería, Médicos, pacientes y familiares.
Authors: Balseiro Almario Lasty , Ayala Quintero Ma. Teresa , Torres Lagunas Ma. De los Angeles
Published: January 2019

El objeto de esta investigación es la evaluación de la calidad de la Atención de Enfermería en 5 Unidades de Medicina Familiar, según la opinión de los usuarios en la zona de Tlalnepantla de la Delegación Oriente del IMSS, en el Edo. de México. La variable medida es: Calidad de la atención de Enfermería en las dimensiones de estructura, procesos y resultados. EI tipo de investigación es diagnóstica, analítica, descriptiva, transversal y de campo. En los criterios de inclusión se toma en cuenta a usuarios de las unidades médicas familiares No. 52, 60, 62, 64 Y 79 de la Delegación Oriente del IMSS en Tlalnepantla. Las técnicas e instrumentos de investigación fueron: fichas de trabajo, observación, entrevista y cuestionarios. EI universo estuvo constituido por 5500 usuarios de la zona de Tlalnepantla, la población fue de 550 pacientes y la muestra fue de 535 usuarios. Se comprueba la hipótesis de trabajo que dice: Existe una alta calidad de la atención de Enfermería en las 5 unidades de Medicina Familiar según la opinión de 544 usuarios. La investigación se realizó en 1998, y en los resultados se pudo constatar que la calidad de la atención de Enfermería es "de buena a excelente", ubicándose esta percepción en las dimensiones de proceso y resultados.

En opinión de los usuarios, esa baja Calidad de Estructura se debe en parte, a los problemas por los que atraviesa el IMSS en ese periodo, dando como resultado que esos problemas se reflejan en el proceso de atención de Enfermería. De igual forma, las principales quejas que tienen los usuarios en las cinco entidades, se pudo conocer que estas quejas van en el sentido de la "Estructura" por la falta de dotación de medicamentos, de ropa, y de los servicios básicos que deben prestar las clínicas que ofrecen un primer nivel de atención: detecciones, orientaciones y capacitación a los pacientes. De igual forma, existen pocas quejas en relación a la cortesía y calidez del personal de Enfermería, lo que es reflejo de la falta de recursos humanos y el exceso de trabajo, entre otras cosas.