bluuebunny/crossref_metadata_2025_split huggingface dataset:
ANN approach in the creation of thin gas-sensitive films based on modified polyacrylonitrile
Authors: Semenistaya T.V. , Kutomkina E.V. 
Published: December 2019

Abstract
In this study, the dependence gas sensitivity coefficient of silver-containing polyacrylonitrile (PAN) films on the technological parameters using artificial neural networks (ANN) is studied. Modelling is performed based on 38 datasets at different conditions. Initially, the experimental data on the fabrication of the films with gas-sensing properties have been collected, which constitutes the simulation space. At the next stage, the analysis of the measurement results has been carried out, self-tuning and training of the neural network have been done to provide the required output signal. Using the neural network model, the optimal technological parameters for creating efficient gas sensors for nitrogen dioxide have been established. Verification of the model was performed: the data convergence was 8-13%.
Advanced oxidation process for detonation nanodiamond surface chemical modification
Authors: Shestakov M S , Vul’ S P , Dideikin A T , Larionova T V , Shvidchenko A V , Yudina E B , Shnitov V V 
Published: December 2019

Abstract
An advanced oxidation process has been implemented for detonation nanodiamond surface chemical modification. The treatment intended for chemical oxidation of detonation nanodiamond surface through reactions with ozone in aqueous media. A number of detonation nanodiamond samples were processed: purified industrial grade and single particle hydrosols of air oxidized and hydrogen annealed detonation nanodiamonds. Comparative analysis of surface chemical composition provided by XPS and FTIR data.
HVPE growth of α- and ε-Ga2O3 on patterned sapphire substrates
Authors: Nikolaev V I , Pechnikov A I , Nikolaev V V , Scheglov M P , Chikiryaka A V , Stepanov S I , Medvedev O S , Shapenkov S V , Ubyivovk E V , Vyvenko O F 
Published: December 2019

Abstract
Here we report on the growth and characterisation of α- and ε-Ga2O3 epitaxial films produced by halide vapour phase epitaxy (HVPE). The films were deposited on two types of substrate: (0001) plain sapphire substrates and (0001) patterned sapphire substrates with regular cone-like features. In order to guarantee the same growth conditions on plain and patterned sapphire, the two substrates were used simultaneously in the same growth run. After the deposition the samples were studied by x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), optical transmission (OT) spectroscopy, and cathodoluminescence (CL). The growth on plain sapphire substrate produced an 11 μm thick continuous α-Ga2O3 layer. The full width at half maximum (FWHM) of the (0006) XRD rocking curve is 180 arcsec, which indicates good crystallinity of the layer. In contrast, growth on the patterned sapphire substrate resulted in a layer with regular spaced faceted pyramids at the surface. XRD analysis revealed the presence of both α- and ε-phases in Ga2O3 grown on patterned sapphire substrate. The presence of the ε-Ga2O3 phase, which has narrower bandgap, was also confirmed by optical transmission measurements. SEM, TEM, and SEM CL observations revealed that α-Ga2O3 phase forms columnar structures on top of sapphire cone, and ε-Ga2O3 phase fills the valleys between the columns.
Direct photon measurements in He+Au collisions at 200 GeV
Authors: Berdnikov A. , Berdnikov Ya , Kotov D. , Solovev V. 
Published: December 2019

Abstract
The PHENIX experiment has published direct photon yields from different collisions at RHIC energies and discovered a large excess of low-pT
direct photons in Au+Au collisions at

N

s

N

=
200

GeV compared to reference p+p collisions, which has been attributed to thermal radiation from the hot and dense medium. PHENIX has also developed a new technique to identify conversion photons without assuming the radius where the conversion happened. This method greatly increases the available statistics and reduces systematic uncertainties. This paper presents the results obtained from real photons in the electromagnetic calorimeter and photons converted at the layers of Silicon Vertex Tracker (VTX).
New method for determining the composition of liquid media during the express control of their state using the nuclear magnetic resonance phenomena
Authors: Myazin N S , Davydov V V , Rud’ V Yu , Yushkova V V , Dudkin V I 
Published: December 2019

Abstract
The processing of nuclear magnetic resonance (NMR) signals from various liquid media is an important step in monitoring their state. At the same time, the processing of NMR signals is quite a challenge during express control by NMR relaxometer. Therefore, the article substantiates the need to develop a new method for NMR signals processing. For this purpose, a universal mathematical model for describing the NMR signal from various media has been proposed. This model takes into account the features of recording signals using a modulation technique in a weak magnetic field. In addition, the article presents the results of calculations of the components concentrations in the studied mixtures of liquid media. Also these results are compared with the experimental data.
Research of component composition of mineralized bone implants by Raman spectroscopy
Authors: Timchenko P E , Timchenko E V , Volova L T , Frolov O O , Yagofarova E F 
Published: December 2019

Abstract
The results of Raman spectroscopy to evaluate alternative sources for donor bone implants using the “Lioplast” technology are presented. It is shown that Raman spectroscopy can be used to assess the component composition of the surface of bone implants during their treatment. It has been found that major differences were at Raman bands 1448, 1735 (lipids & fatty acid), 850 and 875 cm-1 (proline & hydroxyproline), 1001 and 1026 cm-1 (phenylalanine) and 1272, 1560 cm-1 (amide II, amide III). The criteria which allow to evaluate the component composition in the production of bioimplants are proposed, and a two-dimensional analysis was carried out. The analysis showed that the main components of the extracellular matrix necessary for the implementation of osteoinductive and osteoconductive properties of biomaterials are saved during processing. Lipids were removed that improved the quality of the material, providing the possibility of a good clinical effect.
Efficiency evaluation of the transverse magneto-optical Kerr effect in magnetoplasmonic structures
Authors: Pavlov S I , Pevtsov A B , Dyakov S A , Yavsin D A , Nashchekin A V 
Published: December 2019

Abstract
In this study the new approach to the efficiency evaluation of the transverse magneto-optical Kerr effect is considered. To assess the prospects for the practical use of structures based on TMOKE, the Figure of Merit (FOM) parameter is introduced, which is the product of the reflected/transmitted light intensity and the Kerr signal of the structure. Kerr signal defined as absolute value of the difference of light intensities at opposite magnetizations. It is shown that parameter Figure of Merit (FOM) in proposed form can give more information than the most commonly used relative value of TMOKE. The advantages of the introduced parameter are demonstrated on the example of a magnetoplasmonic structure with thin magnetite films.
Anticrossing of optical modes in coupled microcavities
Authors: Mitryakhin V N , Shapochkin P Yu , Lozhkin M S , Hatzopoulos Z , Tzimis A , Savvidis P , Kapitonov Yu V 
Published: December 2019

Abstract
In this work we investigate the reflectance spectra of the GaAs/AlGaAs/AlAs-based coupled microcavities consisting of two cavity layers separated and surrounded by distributed Bragg reflectors (DBRs). The observed optical modes are described by the coupled harmonic oscillators model with parameters derived from the modelling of the layered structure by the transfer matrix method. The theory explains the observed anticrossing behaviour of optical modes with position on the sample, being able to reveal the cavities thickness gradients.
Application of Raman spectroscopy to assess the articular surface after performing chondroplasty in rabbits
Authors: Timchenko E , Timchenko P , Dolgushkin D , Volova L , Lazarev V , Povelihin A , Markova M , Lomkina A , Tumchenkova A , Tihomirova G 
Published: December 2019

Abstract
This paper presents the results of expanded analysis after the experimental researches with the samples femoral bones of rabbits in distal epiphysis area using the Raman spectroscopy method. It has been found that values of the optical ratios characterized by reduction of Raman bands during transition from the intact cartilage zone to the PFP plasty region on the wave numbers 956 cm−1 (PO3
−4 (symmetric stretching phosphate oscillation)), 1069 cm−1 (CO3
2-(C-O planar stretching vibration)) and relatively constant coefficients on the wavenumbers 852 cm−1 (Proline), 1250 cm−1 (Amid III), 1587 cm−1 (Amid II) и 1660 cm−1 (Amid I ), and also on the 1745 cm−1 ((C=O) Lipids).
A new method of processing a pulse wave in rapid diagnosis of the human health
Authors: Davydov R V , Antonov V I , Yushkova V V , Davydov V V , Rud’ V Yu , Smirnov K J 
Published: December 2019

Abstract
The article describes a new algorithm for processing the pulse wave, which is formed from the registered signals of absorption and scattering of laser radiation on a blood vessel and human tissues. A new method for tuning the optical part of the pulse oximeter is proposed to increase the reliability of the results in the rapid diagnosis of the human health condition. Experimental data on studies of various people are presented.
Strong Disorder in HgCdTe Studied with Optical Methods and X-Ray Diffraction
Authors: Andryushchenko D A , Trapeznikova I N , Bazhenov N L , Yagovkina M A , Mynbaev K D , Remesnik V G , Varavin V S 
Published: December 2019

Abstract
Optical transmission, photoluminescence, and X-ray diffraction have been used for studying structural disorder in Hg1-xCdxTe (x=0.3–0.4) films grown by Molecular-Beam Epitaxy on GaAs and Si substrates. According to all three methods, studied films immediately after the growth showed quite different scale of the disorder. After thermal annealing films showed similar optical properties, yet their structural properties remained different. It appears that the ability of Hg1-xCdxTe to gain good optical quality under annealing for considerably disordered initial material is not directly structure-related.
Antireflection coating for photovoltaic converters based on InP native oxide
Authors: Epoletov V S , Marichev A E , Levin R V , Pushniy B V , Talnishnikh N A 
Published: December 2019

Abstract
One of the interesting materials for the antireflective coatings of photovoltaic converters based on InP is the anodic oxide of indium phosphide. This material might be used as a first layer of a multilayer antireflection coating, as well as an independent single-layer antireflection coating. This paper deals with the study of the coating and research of its effect on the reflection coefficient from the InP surface.
Spontaneous and stimulated emission in InAs-based LED heterostructures
Authors: Semakova A A , Lipnitskaya S N , Bazhenov N L , Kizhaev S S , Chernyaev A V , Stoyanov N D , Mynbaev K D 
Published: December 2019

Abstract
Electroluminescence of ‘flip-chip’ LED heterostructures containing active layers made of InAs and barrier layers made of InAsSb(Ga,P) was studied experimentally and modelled. At the room temperature, spontaneous emission attributed to band-to-band recombination was observed. The shape of the EL band was strongly affected by absorption in the substrate. At low temperatures (T=4.2 and 77 K), stimulated emission was observed. Factors affecting the appearance and quenching of stimulated emission are discussed.
Two-dimensional waveguide for efficient second-harmonic generation in visible range
Authors: Savchenko G M , Averkiev N S , Sokolovskii G S 
Published: December 2019

Abstract
A semiconductor structure is proposed that generates the second harmonic with an output wavelength of 550 nm. The structure consists of a two-dimensional waveguide with a semiconductor photonic crystal located in its core. Calculation of dispersion of eigenmodes in this structure shows that the coherence length of nonlinear conversion can exceed 1 cm.
Analysis of spectral irradiance blurring by Fresnel lens sunlight concentrators
Authors: Filimonov E D , Levina S A , Shvarts M Z 
Published: December 2019

Abstract
Solar spectral irradiance blurring in the focal plane of the Fresnel lens arising from the chromatic aberration (CA) inherent to a lens was studied. The experimental complex for recording both irradiance distribution and spectral irradiance redistribution for the radiation concentrated by a small-sized energy concentrator based on a solar simulator with the possibility of modeling the spectral composition of light is presented. The methodology for scanning the irradiance spectral redistribution by a fiber spectrometer is described.
Experimental investigation of single pulse matched filtration on the spin-wave active ring resonator
Authors: Martynov M I , Zaretskaya G A , Semenov A A 
Published: December 2019

Abstract
Experimental investigation of single square pulse matched filtration in the active ring resonator is described in this work. Features of spin-wave delay line with metal screen in the active ring resonator are discussed. Influence of the microwave amplifier on formation of the active ring resonator impulse response was described. It is shown that the side peaks of impulse response depend on full energy in the ring circuit. Measurements of the ring response on input mixed signal with high S/N ratio are presented. Dependence of the output signal amplitude on signal to nose ratio is showed and discussed. Formation of the noise part of output signal is showed and influence of spin-wave dispersion on it is described.
CXRS measurements of ion temperature profile in NBI shots of the Globus-M spherical tokamak.
Authors: Larionova M.M. , Miroshnikov I.V. , Gusev V.K. , Minaev V.B. , Patrov M.I. , Petrov Yu.V. , Sakharov N.V. , Schegolev P.B. , Telnova A.Yu. , Bakharev N.N. 
Published: December 2019

Abstract
Ion temperature is one of the most important parameters of high-temperature plasma. Information on the ion temperature spatial distribution is necessary for understanding and modelling of particle and energy transport processes, evaluating the effectiveness of plasma heating system operation.
Active spectroscopy also known as CXRS (Charge eXchange Recombination Spectroscopy) is a powerful diagnostic tool for measurements of local values of ion temperature, and is widely used in experiments with magnetic confinement of high-temperature plasma.
Active spectroscopy diagnostics on the Globus-M tokamak utilizes a tangentially injected heating beam of neutrals (hydrogen or deuterium atoms). The CXRS-system setup is described. The results of ion temperature measurements for the last Globus-M experimental campaign before the machine shutdown and further upgrading to higher values of magnetic field and plasma current are presented. Ion temperature significant rise in the experiments with moderate increasing of toroidal magnetic field and plasma current is detected and discussed.
Grid current control in the unstable mode of plasma discharge
Authors: Mustafaev A , Klimenkov B , Grabovskiy A , Kuznetsov V 
Published: December 2019

Abstract
The paper presents the results of studies of the effect of grid current control of triode cesium-barium vapor modulator in the unstable mode of plasma discharge. The possibility of effective modulation of the current due to the development of nonlinear plasma structures formed during the excitation of the electronic instability of Bursian-Pierce is discovered. It is shown that in this mode, in the interelectrode gap, a potential distribution with a virtual cathode is formed, leading to a break of the electron current. In this case, the current in the triode changes almost instantaneously, since the process of the formation of a virtual cathode proceeds over a time of the order of the electron travel time through the gap. This is especially important for the successful practical application of triode modulators. The achieved high transient rates had a positive effect on the efficiency and frequency characteristics of the device. A high electric strength has been implemented, which allows to keep the triode in the locked state after a current break for a long time.
Study of turbulence spectra in a spherical tokamak plasma
Authors: Zhivulin E A , Bulanin V V , Gusev V K , Kurskiev G S , Minaev V B , Patrov M I , Petrov A V , Petrov Y V , Yashin A Y 
Published: December 2019

Abstract
A turbulence study was carried out on the Globus-M tokamak. The main method of turbulence studying was Doppler backscattering. Studies have been performed at different radii (in areas with different plasma parameters). It was found that during the transition from H-mode with edge localized modes (ELMs) to the improved confinement mode without ELMs, both turbulent fluctuations of the plasma density and velocity fluctuations are suppressed, which apparently leads to a decrease in anomalous transport.
Simulation of water flow management by the flood control facilities in the adjacent river basins
Authors: Antonov V I , Davydov R V , Maslikov V I , Molodtsov D V , Badenko V L 
Published: December 2019

Abstract
A systematic approach to reducing the risk of flooding is considered. The main idea of it is to switch from the flood control only by the one hydro system on the main river but to control the whole river system, including many adjacent river basins at various levels. This proposal expands the possibility of using a flood control system of self-regulating hydro systems distributed on adjacent drainage basins at multiple levels by organizing their joint work, ensuring that the maximum allowable water flow in the control sections of the river system is not exceeded. Using the proposed approach will allow protecting from flooding significant areas of land in the lower pool of the main hydroelectric complex in the context of climate change.
The influence of illumination and ionic strength of a solution on the formation of biosensor structure based on a silicon substrate and glucose oxidase molecules
Authors: Maslennikova A A , Kozlowski A V , Santer S , Stetsyura S V 
Published: December 2019

Abstract
We report on a change in parameters of a sensitive layer of field effect biosensor based on a silicon transducer and glucose oxidase (GOx) enzyme molecules. Change in the parameters of the enzyme layer occurs due to the white-light illumination of a Si substrate during the GOx adsorption. It was found that the addition of certain value of NaCl salt concentration, which depends on the presence of a polyethylenimine buffer layer on the semiconductor surface, led to a more prominent effect of photo-assisted adsorption of GOx molecules.
Comparative analysis of hydrothermal conditions of Tomsk region by using different drought coefficients
Authors: Ryazanova A A , Voropay N N 
Published: December 2019

Abstract
The global and regional climatic changes that have been most intense in recent decades are characterized by an increase in the frequency of extreme natural events which include droughts and periods of extensive moistening. Air temperature and precipitation are the main characteristics of climate indicating the changes in the droughts/extensive moistening. According to observations of weather stations of Tomsk region, air temperature has been changing very much since the 70s of the 20th century (during 1967-1997 from -0.6 to + 0.56°C and during 1970-2009 from 0.4 to 0.6°C/10 years). Since the mid-1980s, an increase in precipitation has been observed. For a detailed analysis of drought indices (HTC, S, SPI, and SPEI) in the present paper, we use observation data from the Tomsk region weather stations from May to September, 1966-2017. When calculating the indices, warming of the atmosphere, expressed through air temperature, as well as atmospheric humidification, characterized by precipitation, must be taken into account. Also, for a correct comparison of the hydrothermal conditions of different landscapes it is necessary to use normalized indicators. A comparative analysis of the different hydrothermal indices has shown that the S and SPEI indices most closely correspond to these requirements. They also most synchronously indicate droughts.
Modeling the dynamics of comfort thermal conditions in Arctic cities under regional climate change
Authors: Semenova A A , Konstantinov P I , Varentsov M I , Samsonov T E 
Published: December 2019

Abstract
This work is devoted to modeling of characteristics of comfort thermal conditions in some Arctic cities under climate change. In this paper, the authors try to solve the problem of scarce meteorological observing stations in the cities by modeling thermal comfort indices in the Arctic urban landscape. For this, seven Arctic cities are classified according to a universally accepted classification of local climatic zones (LCZs) to identify the zones that best characterize each of the cities. Building data and data from the weather stations closest to the cities are included in a diagnostic microclimatic model RayMan. As a result of the experiments, air temperature trends and bioclimatic environmental comfort indices for the Arctic cities from 1966 to 2017 have been obtained. An assessment of the evolution of the indices has shown that the transitional seasons (April-May and October-November) make the greatest contribution to the change in comfort of the Arctic cities, and the number of days with severe cold stress decreases in all these cities of the Russian Arctic.
Assessment of the response of Russian forest ecosystems to different climatic conditions from model data
Authors: Martynova Yu V , Krupchatnikov V N 
Published: December 2019

Abstract
The response of extra-tropical evergreen and deciduous Russian forest ecosystems to a wide range of atmospheric background conditions is considered. This study is performed by using a land-surface model, JSBACH. Two numerical experiments are carried out: with hotter and more humid (model PLASIM) and more moderate (model INMCM4) atmospheric background conditions. A perturbation in the climate system is set by using the RCP 8.5 climate scenario. The study has shown a geographical redistribution of the extra-tropical evergreen and deciduous forests across Russia as well as an increase in their fractions in some already forested regions. An increase in the gross and net CO2 assimilation and respiration of these types of forest vegetation, as their response to the climatic disturbances, is obtained. However, even under the conditions of extremely intense climatic disturbances the Russian forest ecosystems will continue to act as CO2 sinks.
Sea ice modeling in the Sea of Azov for a study of long-term variability
Authors: Mizyuk A I , Puzina O S 
Published: December 2019

Abstract
This study deals with an attempt to use the NEMO modeling framework to investigate the long-term variability of the sea-ice fields in the Sea of Azov. A coupled ocean-ice model is used to perform a simulation by using an earlier developed configuration of cascading sea basins (Azov, Black, and Marmara). Various features of geographical location cause the formation of sea ice in the waters of the Sea of Azov and in the coastal area of the north-western Black Sea shelf. For a preliminary accuracy assessment, the simulation results are compared with the data based on satellite observations. The restricted amount of the data for the rather small area under study, as well as the features of the regional weather conditions, produce rather low accuracy of the available data products based on the satellite data. At the same time, the available data from coastal weather stations, as well as archived observations, produce a fairly adequate pattern of the simulated variability of the sea-ice conditions in the basin.