bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effects of plasma on the formation of bulk nanoscale structures with lateral dimensions on the surface of GaAs
Authors: Klimin V S , Rezvan A A , Solodovnik M S , Tominov R V , Ageev O A 
Published: December 2019

Abstract
In this work, the effect of plasma on the formation of bulk nanoscale structures with lateral dimensions on the GaAs surface was studied. The relative change in the area of the bulk structures in different crystallographic directions is demonstrated, in comparing the before and after the operations of modification and profiling with a successive change in the etching time from 0.5 to 2 minutes. The obtained data in the course of the study showed that when applying this technology for producing nanoscale structures, it is necessary to take into account a number of parameters, such as the crystallographic direction of the substrate, the etching time, and the formation voltage of oxide nanostructures.
Chemical synthesis and optical properties of composite materials containing PbI2 nanoparticles
Authors: Kulagina A S , Evstropiev S K , Saratovskii A S 
Published: December 2019

Abstract
The aqueous sols and composite organic-inorganic coatings containing PbI2 nanoparticles (size ∼ 4 nm) have been prepared. The absorption, photoluminescence and nonlinear transmittance (at 532 nm wavelength) have been studied. The electronic absorption spectra of PbI2/PVP sols showed major peak of ground state near 406 nm, which slightly blue shift with decreasing size. Obtained materials are characterized high transparency in visible spectral range and demonstrate quantum confinement effect. PbI2/PVP composite films manifested dependence of radiation resistance with PVP content at ns-laser exposure and size dependence of nonlinear transmittance.
Estimation of particle size using the Debye equation and the Scherrer formula for polyphasic TiO2 powder
Authors: Bokuniaeva A O , Vorokh A S 
Published: December 2019

Abstract
There are two methods to estimate the particle size from X-ray diffraction data: the Debye equation and the Scherrer formula. The main goal of this study is to describe the methodology of particle size estimation on the base of two these methods and to apply it to TiO2 powder to determine the diameters and the mass content of anatase and brookite components. The studied nano-dispersed TiO2 powder was synthesized by the sol-gel method. The proposed method of particle size estimation consists of several steps: 1. Approximation of diffraction peaks by Gaussians and calculation of initial values of particle size with the use of the Scherrer formula; 2. Iterations with the use of the Debye equation to obtain more accurate particle size values; 3. Calculation of the mass content of different components corresponding to the minimum R-factor.
Improvement of properties of cellulose dielectrics by their structure modification with nanocellulose produced of wastes of agricultural crops
Authors: Zhuravleva N , Reznik A , Kiesewetter D , Stolpner A , Smirnova E , Budaeva V 
Published: December 2019

Abstract
A comparative study of laboratory castings of insulating paper was fulfilled: the traditional composition made of insulating cellulose of pine and cellulose, modified with the nanocellulose of the agricultural waste (composite). The positive effect of the introduction of this structure-forming modifier on the electrical and mechanical strength of the cellulose dielectric, as well as its heat resistance was revealed. Confirmation of expediency of development of works of this direction for expansion of raw material base for producing of the bio component promoting increase of working capacity of the cellulose dielectrics used in high-voltage insulation of power devices is received.
Automated pulmonary nodule detection system in computed tomography images based on Active-contour and SVM classification algorithm
Authors: Shariaty F , Davydov V V , Yushkova V V , Glinushkin A P , Rud V Yu 
Published: December 2019

Abstract
Lung cancer is a common type of cancer that requires early diagnosis. Computer systems by particular different image processing techniques can use for increase the speed and accuracy of lung nodule detection. CT images used in this work in order to process medical images. In this paper proposed an automatic lung nodule detection algorithm using active contour method and SVM classification method. In proposed method, at first in order to achieve better results, lung CT image pre-processing is performed. Then the lung area is segmented by thresholding method followed by some reconstruction techniques to transfer non-isolated nodules into isolated ones. In the next step the nodule candidates are determined using active contour method. Then, nodules are detected by the support vector machine (SVM) classifier using efficient 2D stochastic and 3D anatomical features. In the result, nodules are detected with an overall detection rate of 87%; the number of false positive is 7.5/scan and the location of all detected nodules are recognized correctly.
Spectral method for determining quantum wells thickness and the composition in strained heterostructures GaAs/InGaAs
Authors: Pavlov N V , Evstropov V V , Mintairov M A , Mintairov S A , Kalyuzhnyy N A 
Published: December 2019

Abstract
A spectral method for determining the composition and width of quantum wells in strained GaAs/InGaAs heterostructures, based on the effect of separating of radiation absorption peaks of light and heavy holes, is proposed. Within the framework of the Van de Walle and Krijn model-solid theory for the band edges calculating based on the Bir and Pikus theory of deformation potentials, graphical and numerical methods were developed for determining the composition and width of the GaAs/InGaAs quantum wells with an indium content of around 0.4.
Experimental study of power-limiting factors of 1.1 μm range edge-emitting lasers based on InGaAs/GaAs quantum well-dot nanostructures
Authors: Serin A A , Payusov A S , Kornyshov G O , Shernyakov Yu M , Mintairov S A , Kalyuzhnyy N A , Kulagina M M , Zhukov A E , Gordeev N Yu , Maximov M V 
Published: December 2019

Abstract
We present a study of high-power characteristics of edge-emitting lasers based on quantum well-dots (QWD) in a pulsed regime. QWD-based lasers with 2 and 5 active layers emitting at ∼1.1 μm provided maximal optical power of 39 W limited by the pulse current source available. We have investigated the lasing spectra and shown that under the injection current above 20 kA/cm2 the active region overheats approximately by 0.5°C per 1 kA/cm2 during 100 ns current pulse. The active region overheating correlates well with the reducing of the differential efficiency of our devices. We believe that maximal pulse optical power of the QWD-based lasers is limited mainly by our laser wafer design rather than by the QWD active media properties.
New optical method for studying a magnetic track from a moving object
Authors: Logunov S E , Davydov V V , Glinuchkin A P , Podkovyrov I Yu , Rud’ V Yu 
Published: December 2019

Abstract
A new method for detecting a magnetic track from a moving magnetic object is presented. A technique has been developed to study the nature of changes in the magnetic field in a magnetic track using ferromagnetic fluid. The results of experimental studies are presented.
Tunable upconversion luminescence of SrF2: Er,Tm phosphors
Authors: Lyapin A A , Gushchin S V , Kuznetsov S V , Ermakov A S , Ryabochkina P A , Proydakova V Yu , Voronov V V , Yapryntsev A D , Ivanov V K , Fedorov P P 
Published: December 2019

Abstract
In preset paper, for the first time upconversion luminescence (UCL) of SrF2:Er,Tm phosphors upon excitation of 4I13/2 level of Er3+ were investigated. Fluorite-type SrF2:Er,Tm phosphors were synthesized by co-precipitation from aqueous nitrate solution technique. Tuning the UCL by SrF2:Er through Tm3+ ions co-doping was demonstrated. Also we estimated the UCL energy yield in the visible and near-infrared spectral range.
Spectroscopic study of defect states in CdSe nanoplatelets
Authors: Miropoltsev M A , Gromova Y A , Smelov V N , Cherevkov S A , Kormilina T K , Tkach A P , Maslov V G 
Published: December 2019

Abstract
Here we report investigation of red-shifted defect photoluminescence observed in two-dimensional colloidal cadmium selenide nanoplatelets. We used absorption, photoluminescence and photoluminescence excitation measurements to show that red-shifted photoluminescence bands are related directly to nanoplatelets and may originate from surface imperfections as well as be a result of interaction between different nanoplatelets in the solution. We also found that the defect photoluminescence may be easily altered by simple mechanical treatment, including sonication and stirring, thus disclosing the ways to control nanoplatelets emission over time.
The size reducing of the focal spot with focusing short pulses using high-performance computer systems
Authors: Savelyev D A , Fomchenkov S A 
Published: December 2019

Abstract
We investigated the change in the type of focal spot when pulsed radiation passed through the diffraction axicon. The Gauss beam and the Gauss-Laguerre mode (1,0) were considered as the input laser radiation with linear polarization. Modelling of diffraction is numerically investigated by the finite difference time domain (FDTD) method. The formation of a shadow focal spot in the immediate vicinity of an optical element and amplification of the longitudinal component of the electric field were shown.
Propagation of short current pulses in Josephson transition line and ultrafast qubit control
Authors: Bastrakova M V , Klenov N V , Ruzhickiy V I , Satanin A M 
Published: December 2019

Abstract
The results of the study of the impact of single-quantum magnetic flux pulses moving along the Josephson transmission lines (JTL) on the dynamics of states of qubits magnetically coupled with such lines are presented. The JTL dynamics was calculated in the frame of resistively shunted junction model with different damping coefficients. This allowed us to find the form of control current pulses (fluxon) acting on a superconducting qubit. Numerical simulations of the simplest logic operations with superconducting qubit due to calculated fluxon impact are presented.
Development of efficient polymer films with upconversion particles
Authors: Lyapin A A , Chernov M V , Kuzmin A M , Gushchin S V , Ermakov A S , Ryabochkina P A 
Published: December 2019

Abstract
In this work, the polymer film based on the upconversion particles doped Er3+ and Yb3+ ions and polyethylene was obtained byusing extrusion and hot pressing methods. Upconversion luminescence spectra of polymer films were recorded in the visible spectral range upon excitation by laser radiation at wavelengths of 972 nm and 1532 nm. The applications of a polymer film in various areas of photonics are discussed.
Nanostructures with magnetooptical and plasmonic response for optical sensors and nanophotonic devices
Authors: Mikhailova T V , Shaposhnikov A N , Tomilin S V , Alentiev D V 
Published: December 2019

Abstract
It was proposed photonic nanostructures with magnetooptical and plasmonic properties that can be effectively used for optical sensors and nanophotonic devices. Optical, magnetooptical and functional properties of photonic crystals with magnetooptical structural elements in the form of films of bismuth-substituted iron garnets and gold plasmonic layer were considered. Simultaneous excitation of optical Tamm states (OTS) and Fabry-Perot resonance or OTS, Fabry-Perot resonance and surface plasmon-polaritons in proposed nanostructures was considered.
The discovered painting decoration of the Vorontsov` Palace in St. Petersburg: Spectroscopic characterization in support of conservation
Authors: Becucci M , Lofrumento C , Parfenov V , Ricci M , Rogozny M , Pakhunov A 
Published: December 2019

Abstract
The paper reports about the unique discovery of fragments of wall painting of the middle of the XVIII century from the Vorontsov` Palace in St. Petersburg and its study by means of laser and IR spectroscopic techniques. The history of creation and reconstruction of the palace as well as technical and technological features of paintings are described.
Efficiency of focusing grating couplers versus taper length and angle
Authors: Kuzin A , Kovalyuk V , Golikov A , Prokhodtsov A , Marakhin A , Ferrari S , Pernice W , Gippius N , Goltsman G 
Published: December 2019

Abstract
Here we experimentally studied dependence of a focusing grating coupler efficiency versus taper length and angle on silicon nitride platform. As a result, we obtained a dependence for the efficiency of a focusing grating coupler on the parameters of the taper length and angle.
Optimization of electrodes for the fast electrochemical actuator
Authors: Shlepakov P S , Uvarov I V , Naumov V V , Melenev A E , Svetovoy V B 
Published: December 2019

Abstract
Electrochemical membrane actuator based on water electrolysis of alternating polarity (AP) was demonstrated recently. It operates several orders of magnitude faster than the devices working on conventional DC electrolysis. However, extremely high current density of the AP process leads to the fast degradation of the electrodes. Titanium electrodes demonstrate the best durability, but they oxidize during operation that reduces the gas production. Proper design can increase the efficiency of the electrodes and slow the degradation down. In this work, four typical layouts are fabricated and tested in the AP electrolysis. Current flowing through the cell, threshold voltage for the explosive operation and wear of the electrodes are analyzed and compared.
Control electrically conductive of thin films by using subminiature eddy current transducers
Authors: Ishkov A , Malikov V 
Published: December 2019

Abstract
The research objective was the development of subminiature eddy-current transducer designed for studying thin films. Timeliness is subject to the need to assess and predict safe operation life of products manufactured using thin films. A review of various methods for thin films studying was made, including the eddy-current method, based on an analysis of the interaction of an external electromagnetic field with the electromagnetic field of eddy currents induced by an energizing winding in an electrically conductive film. A subminiature surface eddy-current transducer of the transformer type was developed. On the basis of eddy-current transducer, a software and hardware complex was developed to control the eddy-current transducer (to generate alternating current of various frequencies, to provide its supply to the eddy-current transducer, to receive a useful signal from transducers to ensure its convenient visualization). The hardware and software complex provided the opportunity to make local studies of the electrical conductivity of non-ferromagnetic thin films by the method of eddy currents. In the course of the study it was possible to develop an algorithm for finding changes in the average amplitude of the output signal, which allows to conclude about the electrical conductivity of the thin film. The study of thin film samples using the developed measuring system is conducted. The results of testing of Al, Ag and Ni films were presented, and the electrical conductivity values of the samples were obtained.
Simulation of transparent electromagnetic interference shielding materials based on periodic conductive networks
Authors: Shiriaev P P , Ryzhenko D S , Makeev M O , Popkov O V 
Published: December 2019

Abstract
This paper is a preliminary report on a theoretical study of transparent shielding materials with potentially very high shielding efficiency based on quasi-periodic conductive networks. An empirical model for rapid calculation of shielding efficiency vs frequency and mesh geometrical parameters is suggested based on numerical simulation results.
Carbon nanotube based terahertz radiation detectors
Authors: Titova N , Gayduchenko I A , Moskotin M V , Fedorov G.F , Goltsman G N 
Published: December 2019

Abstract
In this paper, we study terahertz detectors based on single quasimetallic carbon nanotubes (CNT) with asymmetric contacts and different metal pairs. We demonstrate that, depending on the contact metallization of the device, various detection mechanisms are manifested.
Induction heat treatment of steel punches with Zr-containing coatings and preliminary results of FLD characteristics when drawing C45 carbon steel
Authors: Fomin A , Koshuro V , Shumilin A , Voyko A , Palkanov P , Aman A , Mukhin N , Palis S 
Published: December 2019

Abstract
The paper presents data on strengthening induction heat treatment (IHT) of die tools (punches) and production of wear-resistant Zr-containing coatings on their surfaces. Preliminary results were obtained on the forming limit diagrams (FLD) during drawing (Nakazima’s test) of sheet C45 carbon steel. It was established that punches with Zr-containing coatings after IHT had better characteristics for stretching compared to the uncoated tool steel.
Terahertz response from bio-tissue to silicon nanostructures
Authors: Taranets K B , Fomin M A , Klyachkin L E , Molyarenko A M , Bagraev N T 
Published: December 2019

Abstract
Here we present the first findings on the resonance response of DNA oligonucleotides deposited on silicon nanosandwich (SNS) and living bio-tissue to the THz irradiation that allow their identification by measuring the change of the longitudinal conductance and the lateral voltage within frameworks of the SNS prepared in the Hall geometry. The THz resonance response from living bio-tissue under the THz radiation is also applied to the definition of oncological diseases. The results obtained from the basis of the express diagnostics in practical medicine.
Optimization of the process of obtaining superconducting bilayer films based on niobium nitride and gold for the manufacture of a superconducting single-photon detector
Authors: Davydchenko M 
Published: December 2019

Abstract
We have manufactured a number of bilayer structures based on niobium nitride and gold with different deposition parameters for NbN-Au films (Table 1). We measured the characteristics of superconducting niobium nitride films both with the top layer of gold and without gold. On the basis of the measured characteristics of the films, the optimal parameters of the deposition of NbN-Au bilayer films were chosen for the further formation of a superconducting single-photon detector.
Effect of ion irradiation on resistive switching in metal-oxide memristive nanostructures
Authors: Mikhaylov A N , Belov A I , Korolev D S , Gerasimova S A , Antonov I N , Okulich E V , Shuiskiy R A , Tetelbaum D I 
Published: December 2019

Abstract
The development of artificial intelligence systems is needed to solve many important challenges in neurobiology and neuroengineering for recreation of brain functions and efficient biorobotics. Here we propose a metal-oxide memristive device compatible with CMOS technology and suitable for hardware implementation of neuromorphic tasks. However, metal-oxide memristors have a significant drawback such as variation of resistive switching parameters due to the stochastic nature of filament formation in oxide material. In this work, we control the filament formation process by irradiation of oxide film surface with heavy ions. We have shown that the irradiation of oxide surface in the Au/SiO2/TiN memristive device with Xe+ ions (at energy of 5 keV) decreases the fluctuations of electroforming voltage, current-voltage characteristics during switching and increases the current ratio in the high/low resistance states. The ability to control internal parameters of the memristor can allow more efficiently using memristor as an element of neural networks and other neuromorphic circuits.
Hypothesis testing of Geographically weighted bivariate logistic regression
Authors: Fathurahman M , Purhadi  , Sutikno  , Ratnasari V 
Published: December 2019

Abstract
In this study, the hypothesis testing of geographically weighted bivariate logistic regression (GWBLR) procedure is proposed. The GWBLR model is a bivariate logistic regression (BLR) model which all of the regression parameters depend on the geographical location in the study area. The geographical location is expressed as a point coordinate in two-dimensional geographic space (longitude and latitude). The response variables of BLR model are constructed from a (2 × 2) contingency table and it follows the multinomial distribution. The purpose of this study is to test the GWBLR model parameters. There are three hypothesis tests. The first is a parameters similarity test using the Vuong test method. The test is to obtain a significant difference between GWBLR and BLR. The second is a simultaneous test using the likelihood ratio test method. The simultaneous test is to obtain the simultaneous significance of the regression parameters. The last is a partial test using Wald test method. The result showed that the Vuong statistic and Wald statistic have an asymptotic standard normal distribution, whereas the likelihood ratio statistic has an asymptotic chi-squared distribution.
The Optimal Implementation of Chlorination, Treatment, and Education Controls in Reducing the Transmission of Cholera Disease
Authors: Fitria I , Hasanah S M , Subchan  , Pratama A P 
Published: December 2019

Abstract
Cholera is an acute disease caused by the bacteria Vibrio Cholerae. Cholera is a contagious and deadly disease that requires immediate medical treatment. The mathematical studies are conducted to create models of cholera transmission. The cholera transmission models are carried out by implementing the optimal controls, namely the chlorination for bacteria, control treatment for quarantined individuals and education campaigns for susceptible and infected individuals. The optimal control efforts are given to minimize the spreading of cholera disease. The method used to solve this optimal control problem is Pontryagin Minimum Principle. Based on the simulation, the provision of optimal controls in forms of education and treatment in individuals and chlorination can minimize the concentration of bacteria and the number of infected humans.