bluuebunny/crossref_metadata_2025_split huggingface dataset:
Electron-microscopy study of ordered silver nanoparticles synthesized in a ZnO:Al polycrystalline film
Authors: Sokura L A , Shirshneva-Vaschenko E V , Kirilenko D A , Snezhnaia Zh G , Shirshnev P S , Romanov A E 
Published: December 2019

Abstract
The optical absorption spectra and structural properties of samples series consisting of AZO oxide films with an intermediate layer of silver nanoparticles with different sol compounds were investigated. TEM analysis of the obtained coatings showed that the nanoparticles in the AZO film form an ordered structure, and the distance between them depends on the sol composition and the film annealing temperature. Optical measurements showed that a position of the nanoparticle plasmon peak in AZO also depends on them.
Investigation of functional properties of metal surfaces after laser treatment
Authors: Ruzankina J , Vasiliev O , Tarasov S 
Published: December 2019

Abstract
This article presents the results of the study of the processes of formation of the metal surface, which has different hydrophysical properties and high chemical resistance to acidic media. The dependence of the contact angle of the surface (θ) on various parameters of laser processing material, the density of arrangement of the scanning vectors, the depth of the heated layer, the presence of oxide layer, etc. Determined optimum modes of laser processing, with which it is possible to obtain the greatest hydrophobicity, and maximum adhesion to the metal surface.
The relationship of the geometric parameters of the surface with its properties (optical, emission, tribological)
Authors: Vasiliev O , Ruzankina J , Tarasov S 
Published: December 2019

Abstract
This article presents the results of the possibility of manufacturing different types of microstructures. Special surface microreliefs have been created to solve a number of important problems related to the functional properties of the object surface and its relationship with the environment.
Monitoring of oil paintings by means of optical 3D scanning
Authors: Zhuravlev A A , Parfenov V A 
Published: December 2019

Abstract
A novel technique of monitoring of painted surfaces is proposed. Experimental results concerned with use of optical 3D scanning for monitoring of oil paintings are presented. One of oil paintings with collection of The Military-Historical Museum of Artillery, Engineer and Signal Corps (St. Petersburg, Russia) was scanned by means of optical 3D scanner, which operates using structured light. The scanning was carried out 2 times with time interval of 4.5 years. In both cases we created computing 3D models of the same painting. These models were compared using software GeomagicStudio that allowed to get a precise quantified information about deformations of canvas and frame of painting.
The impact of terahertz chiral metasurface resonator rotation on polarization properties of transmitted wave
Authors: Masyukov M. S. , Vozianova A V , Grebenchukov A N , Khodzitsky M K 
Published: December 2019

Abstract
In this paper the influence of one and two chiral metasurfaces on polarization of the transmitted wave has been studied. The numerical simulation in CST Microwave Studio confirms the influence of the resonator rotation in the unit cell on polarizing properties of the metasurface. The ability of changing the polarization of the terahertz wave by two layers of such metasurfaces was shown. Thus, such metasurface can be used in development of mechanically-tunable polarization converter.
Tamm plasmon structure with an optical Fibonacci lattice coating
Authors: Gubaydullin A R , Morozov K M 
Published: December 2019

Abstract
We have theoretically investigated a Tamm plasmon structure covered by subwavelength grating with quasicrystal symmetry using a finite element method. The possibility to support a number of high-Q hybrid optical eigenstates in such systems was demonstrated. The model structure consists of a GaAs/Al0.95Ga0.05As Bragg reflector covered with a F
6 subwavelength Fibonacci silver/PMMA coverage. The considered system with a quasicrystalline grating has interesting properties and can be used as light filtering and emission amplifying components of optoelectronic systems.
Coupling of plasmon and grating resonances for SERS enhancement
Authors: Scherbak S A , Babich E S , Reduto I V , Lipovskii A A 
Published: December 2019

Abstract
We used thermal poling structuring of glass samples followed by chemical etching and subsequent out-diffusion growth of silver nanoparticles to fabricate periodic arrays of grooves etched in the glass with silver nanoparticles at their bottom. A numerical modeling of optical properties of these periodic structures was performed. We demonstrated that they support both plasmon and grating resonances, which interaction provides additional enhancement of an incident electric field. This can increase surface-enhanced Raman scattering by such biresonant structure.
Advanced aperture cantilevers made by focused ion beam for both magnetic domain structure and morphology investigation in high resolution magneto optical microscopy
Authors: Vysokikh Yu E , Krasnoborodko S Yu , Kolomiytsev A S , Fedotov A A , Shaposhnikov A N , Bulatov M F , Churikov D V , Shevyakov V I 
Published: December 2019

Abstract
Magneto-optical microscopy is a well-known and widely used method of magnetic domain structure investigation. Spatial resolution is limited by diffraction limit of the light and practically not exceed 0.5μm. Possibility to overcome diffraction limit by combination of magneto-optical microscopy and magnetic-force microscopy was showed earlier [1]. Aperture cantilever was used to light up the sample in near-field mode. In this paper, authors review most popular technology for aperture cantilever production with its advantages and disadvantages. Authors propose new technology based on focused ion beam treatment for creation aperture cantilevers with advanced parameters such as small aperture size and light throughput. Bi-substituted yttrium iron garnet (Bi: YIG) thin films with high magneto-optical activity and different period of domain structure were used as test objects. High resolution images of both morphology and domain structure obtained with new advanced aperture cantilevers are shown.
Magneto-optical properties of terbium-doped metaphosphate and borate glasses
Authors: Kulpina E V , Babkina A N , Fedorov Y K 
Published: December 2019

Abstract
The paper shows the results of Faraday Effect study of borate and metaphosphate glasses doped with various concentrations of terbium under uniform longitudinal magnetic field. The Verdet constant of glass under study is obtained based on the experimental data for several wavelengths. The optical and spectral properties of glasses are also studied.
Developing of normally-off p-GaN gate HEMT
Authors: Kukhtyaeva O B , Egorkin V I , Zemlyakov V E , Kapaev V V , Zaitsev A A , Tsatsulnikov A F , Nikolaev A E , Sakharov A V 
Published: December 2019

Abstract
In this paper, the high electron mobility transistor (HEMT) with p-GaN gate is developed. The article demonstrates development of normally-off p-GaN gate HEMT on heterostructure with AlN stop layer for p-GaN selective etching and formation of normally-on GaN HEMT on the same wafer. It is researched that the gate length and gate-to-drain length influence on transistor operation and its breakdown voltage. The ohmic contact resistance and leakage currents depend on etching RF mode. The developed normally-off transistor with gate length of 1 um and gate-to-drain length of 9.5um has a breakdown voltage of 500 V and drain current in open state of 350 mA/mm. It is established that 2 nm SiN under the gate metal influence on device work.
Determation of dV/dt values for domestic SiC Schottky diodes
Authors: Sedykh S V , Rybalka S B , Drakin A Yu , Demidov A A , Kulchenkov E A 
Published: December 2019

Abstract
In this study the dV/dt values for 4H-SiC commercial diodes have been determined experimentally. The experimental measuring tester for determination of dV/dt values of diodes at amplitude of impulse of reverse voltage VA (VA=100÷950 V) applied across the Schottky diode was constructed. It was determined that the dV/dt value almost linearly increase with increase of impulse of reverse voltage VA (in interval of VA=100÷900 V) applied across the 5DS402A9 diode for the first time. It is determined experimentally that at the maximal impulse of reverse voltage (900 V) applied across the silicon carbide commercial 5DS402A9 diode produced by domestic company the dV/dt value (148 V/ns) is comparable with others commercial diodes and therefore diode of this type can stably function in electric power circuit.
Peculiarities of the electronic transport in topological materials of Bi2Se3 and MoxW1-xTe2 (x = 0; 0.5; 1)
Authors: Chistyakov V V , Domozhirova A N , Huang J C A , Naumov S V , Marchenkov V V 
Published: December 2019

Abstract
The electrical resistivity of thin films of a topological insulator of Bi2Se3 with a thickness of 10 nm to 75 nm, single crystal of Bi2Se3 with thickness of 0.65 mm and single crystals of topological Weyl semimetals MoxW1-xTe2 (x = 0; 0.5; 1) in the temperature range from 4.2 to 300 K was measured. A size effect in the electrical conductivity of Bi2Se3 films was observed, i.e. linear dependence of the conductivity of the film on its reciprocal thickness. It is suggested the existence of two different conduction channels in the Mo0.5W0.5Te2 compound.
Effect of oxygen on the properties of Ga2O3:Si thin films
Authors: Almaev A V , Chernikov E V , Kushnarev B O , Yakovlev N N 
Published: December 2019

Abstract
The results of studies of electrical and gas-sensitive characteristics of thin films Ga2O3:Si on exposure to oxygen in the range from 0 to 100 vol. % and operating temperatures from 25 to 700 °C were presented. Samples were obtained by HF magnetron sputtering. The possibility of developing low-temperature oxygen sensors was shown. A model of oxygen interaction with Ga2O3:Si films was proposed. The mechanism of Si influence on gas-sensitive properties of thin films of gallium oxide was proposed.
The effect of ion implantation and annealing on forming process in Al2O3/HfO2/Al2O3 memristor structure
Authors: Permyakova O O , Miakonkikh A V , Rudenko K V , Rogozhin A E 
Published: December 2019

Abstract
In this paper, we study the effect of annealing and plasma immersion ion implantation of He+ conditions on forming voltage for the Al2O3/HfO2/Al2O3 memristive structures. Planar memristor structures were obtained by PEALD. It was shown that He+ implantation and annealing lead to decrease of forming voltage but also increase the dispersion of the set voltage of the memristive structures.
The influence of star-like palladium nanocrystallites on the gas transport parameters of modified palladium-containing membranes
Authors: Petriev I 
Published: December 2019

Abstract
Methods to modify the surface of Pd-23% Ag alloy films were developed in order to increase the velocity of hydrogen transmission; we obtained palladium coating of “nanostars” and “nanopores” type. Modification of Pd-Ag films surface, obtained by nanostars palladium coating makes it possible to achieve a hydrogen flow density of 0.76 mmol / (s*m2), which is 1.6 times greater in comparison with modification by “nanopores” coating under low temperature (<90 ° C) and pressure (<0.6 MPa) conditions.
Effect of crystal orientation on the implant profile and resistance of SiC
Authors: Egorkin V I , Nezhentsev A V , Zemlyakov V E , Gudkov V A , Garmash V I 
Published: December 2019

Abstract
The process of ion implantation into silicon carbide is studied in this paper. We conducted an analysis of acceptor distribution profiles. We determined that silicon carbide layers with an orientation (11–20) have a higher degree of crystal lattice recovery after ion implantation with aluminum ions than a crystal lattice with an orientation (0001). A significantly higher efficiency of ion doping of silicon carbide with an orientation (11–20) was shown, which may indicate a more efficient recrystallization of the fastest growing crystallographic direction. We have established a higher degree of restoration of the crystal lattice of silicon carbide implants with an orientation (11–20) after implantation. Highly doped SiC p-layers were obtained with a specific resistance of about 0.02 Ohm*cm and with high crystalline structure quality without the use of ultra-large implantation doses. The minimum value of Rs for orientation (0001) is about 10 k Ω/□, and for orientation (11-20) - 2.7 k Ω/□.
Study of plates with a combined “steel base – (titanium, oxide) coating” structure and preliminary tests of its wear resistance
Authors: Egorov I , Fomin A 
Published: December 2019

Abstract
This paper presents the results of the study of plates with a combined “steel base – titanium, oxide coating” structure, which was obtained by resistive welding and strengthening induction heat treatment. The data of measurements of hardness and preliminary test for wear resistance were given. The possibility of finishing turning on structural chromium steel X40Cr13 was shown.
The results of modelling of a micromechanical accelerometer
Authors: Lysenko I E , Ezhova O A , Tkachenko A V , Naumenko D V , Guha K , Rao K S 
Published: December 2019

Abstract
This theses the linear acceleration sensor design with three axis of sensitivity is researched. Parameterized geometry and finite element model for modal analysis are developed in the ANSYS program. Behavioral description of the study design is developed with language VHDL-AMS to simulate the sensor operation under the influence of linear acceleration along three axis of sensitivity. On the basis of research results three-axis device sensitivity, cross-sensitivity, duration transients are specified. As part of the work the experimental sensor prototypes are fabricated.
Sensitive elements of microelectronic sensors of fast variable and static pressure
Authors: Fimin A. V. , Gurin S. A. , Pecherskaya E. A. , Golubkov P. E. , Kozlov G. V. , Kraynova K. Y. 
Published: December 2019

Abstract
The technical progress development contributes to the introduction of automated methods of management and control of the system state. The use of sensor equipment with the use of piezoelectric tensor-resistive modules allows to register fast variable and statistical pressure, respectively. Such assemblies possess not only the most reliable information content of the measured values, but also combine simple step-by-step manufacturing techniques.
Investigation of resistive switching in gallium oxide nanostructures formed by local anodic oxidation
Authors: Tominov R V , Polupanov N A , Avilov V I , Solodovnik M S , Parshina N V , Smirnov V A , Ageev O A 
Published: December 2019

Abstract
Effect of resistive switching in gallium oxide structure was studied. It was shown, that gallium oxide structure, formed by local anodic oxidation, demonstrated resistive switching from high-state resistance (HRS) to low-state resistance (LRS) at +4 V, and from LRS to HRS at -6V. RHRS, RLRS, RHRS/RLRS were equaled 11.7±1.6 GΩ, 2.3±0.8 GΩ and 5, respectively. Homogeneity test showed, that RHRS and RLRS were equaled 10.6±2.8 GΩ and 2.5±1.7 GΩ, respectively. It was shown, that confidence interval of resistive switching effect of endurance test for HRS is less on 42% and for LRS is less on 53%, than for homogeneity test So, it was shown that the obtained gallium oxide structure has a uniform effect of resistive switching within 15 measurements. The results can be useful for based on gallium oxide neuromorphic system manufacturing.
Simulation of hopping in disordered fractal arrays of graphene quantum dots
Authors: Morozova Ekaterina 
Published: December 2019

Abstract
Diffusion regimes of charge carriers in artificial quasi-fractal graphene quantum dot (GQD) superlattices forming hexagonal and triangular carpet are investigated. Using the generalized Miller-Abrahams relations for hopping rates we perform Monte Carlo simulation of charge carrier hopping in artificial 2d disordered arrays of armchair GQDs. The variations of the anomalous advection-diffusion parameters as functions of localization radius, electric field intensity, levels of energetic and structural disorder are studied.
Study of the features of ultrafast silicon-carbide current switch for sources of soft x-ray radiation based on capillary plasma
Authors: Serguschichev K A , Smirnov A A , Ilyin V A , Afanasyev A V , Samokhvalov A A , Timshina M V , Eliseev S I 
Published: December 2019

Abstract
The results of the development and experimental investigation of high-voltage silicon-carbide high-speed current switches – drift step recovery diodes (DSRD) – and their implementation as a part of soft X-ray source based on capillary plasma are presented.
The method of improving the parameters of the microwave excitation signal in the rubidium – 87 quantum frequency standard
Authors: Valov A P , Davydov V V , Rud V Y 
Published: December 2019

Abstract
This article discusses the design of the rubidium – 87 quantum frequency standard for satellite navigation systems. Also it is proposed a method for improving the parameters of the microwave excitation signal to improve the short-term and long-term stability of the frequency standard. The results of experimental research are presented.
Development of subwavelength diffractive optical elements manufacturing process for photonic devices
Authors: Fomchenkov S A , Porfirev A P 
Published: December 2019

Abstract
Subwavelength diffractive optical elements with characteristic dimensions close to the wavelength can implement interesting optical functions, replacing, advantageously, other structures with dimensional features much smaller than the wavelength. The fabrication process becomes easier and the performance is better controlled. A study of a subwavelenght DOE manufacturing process with use of available technologies will be presented.
Identification of Phase CaCO3/MgO in Bangkalan Dolomite Sand as An Antibacterial Substance
Authors: Rohmawati L , Sholicha S P , S Holisa SP , Setyarsih W 
Published: December 2019

AbstractDolomite sand has several ingredients such as CaCO3and MgO which have the potential as an antibacterial substance. The making of this antibacterial substance uses the heating/calcination method of dolomite powder with a variation of holding time from 0.5 to 2.5 hours at a temperature of 700°C. The nanoparticles produced from the calcination process were then characterized by XRD to identify the formed phase. This study aimed to determine the effect of holding time on phase formation on dolomite. The results of this study are identified as forming four phases namely calcite (CaCO3), periclase (MgO), calcium hydroxide (Ca(OH)2) and lime (CaO) with different percentages in each variation of holding time. The Ca(OH)2and CaO phases include the impurity phase with a lower percentage than the CaCO3and MgO phase percentages. The most dominant phase is CaCO3and the MgO phase formed optimally at 1 hour holding time with a percentage of 47.1% CaCO3and 35.9% MgO.
Solvent Effect on Viscoelastic Behaviour and Morphology of Polyaniline Coating at QCM Sensor
Authors: Putri N P , Pravitasari D W , Al Aziz F , Maulidiah  , Santjojo D J D H , Masruroh  , Sakti S P 
Published: December 2019

Abstract
The effect of different solvents and solution concentration on viscoelastic behaviour and morphology of polyaniline (PANi) coating was investigated in this study. The PANi coating on a QCM sensor was created by spin coating with various solvents, such as NMP, m-cresol, and DMF with varying concentrations of 1-4% by weight of PANi. The viscoelastic behaviour was observed by impedance analyser and morphology of the PANi coating was observed via optical microscope and SEM/EDX. The viscoelasticity was measured to determine whether the coating produces an acoustic load (loading effect). The observations showed that the different solvents give a different effect on the impedance value of the PANi coating. With m-cresol solvent, the impedance value in the series resonant frequency was so large, indicating the PANi coating was not rigid and produce a loading effect on QCM sensor. From morphology observation showed that homogeneity of the polyaniline coating is still poor. There is an agglomeration of polyaniline powder which is insoluble in the solvent used. From the viscoelastic properties of the coating, the optimum value was obtained in PANi coating with NMP solvent.
Spectral Approach to Modeling Dependence in Multivariate Time Series
Authors: Ombao Hernando 
Published: December 2019

Abstract
Consider a multivariate time series such as prices of stocks from various sectors, amount of rainfall in many geographical locations, and brain signals from many different locations on the scalp. The goal of this paper is to present the spectral approach to modeling dependence between components of the multivariate time series. There are many measures of dependence - the most popular being cross-correlation or partial cross-correlation. This measure is easy to compute and easy to understand but it coarse in a sense that it is not able to identify the underlying frequencies that are responsible for driving the dependence. In the stock price example, two stocks may be highly correlated but it would be helpful to see if this correlation is driven by the daily fluctuations or by millisecond-level fluctuations. In the neuroscience example, when two brain regions exhibit a high level of correlation, it will be important if this synchronicity is due to low-frequency oscillations or high-frequency oscillations. Here we present an overview of the underlying principles through specific spectral models which decompose the signals into oscillations of various frequencies and then model lead-lag dependence via these oscillations.
Subsampling Method for Big Data in Poisson Regression
Authors: Pradana A N I , Sofro A 
Published: December 2019

Abstract
Big Data is very large, too fast and complex that cannot be managed with traditional tools; and must use new methods and tools to process it. Subsampling method is one method that can be used to solve big data problems. This paper focuses on estimation in Poisson Regression using Maximum Likelihood Estimation (MLE). In this study, it will be discussed about the implementation of the Subsampling method of The Demand for Medical Care data. To understand the performance of subsampling method, the paper provided a scenario with different sample sizes. The results of this study obtained parameter estimates and Poisson regression models on each subsample. Based on the Akaike Information Criterion, the best model is providing the smallest value. From the scenario, the sample size of the subsampling which is close to sampling tend to have smaller value of AIC.