bluuebunny/crossref_metadata_2025_split huggingface dataset:
The study of Si/Ge interdiffusion using molecular dynamics simulation
Authors: Bastrakova M V , Mukhamatchin K R , Kuznetsov Yu M , Dorokhin M V 
Published: December 2020

Abstract
The coefficients of mutual diffusion of silicon into germanium (and vice-versa) at temperatures of 900-1300K were found based on molecular dynamics simulation. For the characteristic temperature Tc=1100 K, which is close to the melting point of Ge, we determined the thickness of the diffusing layer for each type of atom. It is shown that the depth of diffusing significantly depends on the sintering time, and silicon atoms penetrate 1.5 times deeper into bulk germanium than germanium into silicon.
Research of the effect of solvents on the rheological characteristics of drop-on-demand inkjet liquid toner
Authors: Klimontov K A , Vaganov V V , Kruglov A I 
Published: December 2020

Abstract
In this work the relationship of the rheological characteristics of liquid toner with external factors (shear strain rate, temperature) depending on the solvent used is investigated, experiments with a number of solvents (sulfolane, 3-methoxypropionitrile or acetonitrile) are carried out.
The study of the AlN/Si(111) epitaxial structures grown by PA MBE via coalescence overgrowth of AlN nanocolumns
Authors: Shubina K Yu , Mokhov D V , Berezovskaya T N , Nikitina E V , Mizerov A M , Bouravleuv A D 
Published: December 2020

Abstract
The AlN/Si(111) epitaxial structures were synthesized by coalescence overgrowth of AlN nanocolumns using PA MBE technique. Such epitaxial structures can be used as a buffer layer for obtaining high quality AlN and GaN layers. Structural, electrical and chemical properties of these samples were studied. For the first time it was demonstrated that the etching of the obtained type of AlN/Si(111) structures in KOH can become a promising method for obtaining high quality free-standing AlN and GaN.
Optical properties of InGaN/GaN QDs nanorods by top-down fabrication after KOH treatment
Authors: Kotlyar K P , Menzelincev A K , Kiseleva E M , Shcherbakova V B , Shilov V A , Smolina E O , Berezovskaya T N , Dragunova A S , Kryzhanovskaya N V , Nikitina E V , Soshnikov I P , Cirlin G E 
Published: December 2020

Abstract
In this paper, we demonstrate and investigate the process of wet chemical etching in KOH solutions of InGaN quantum dots/GaN nanorods with the average height of heterostructure 330 nm and lateral size up to 120 nm. Morphological studying showed a significant thinning of nanorods to 40-80 nm and the shape transformation from trapezoidal to cylindrical, which led to the formation of an optimal resonator for the light-based GaN material. In this case, the photoluminescence intensity of the structure with nanorods increased in comparison with the initial planar LED structure, decreasing the impact of sidewall defects, which in turn led to the dramatic increase of the photoluminescence intensity. Further etching leads to a thinning of the GaN-p type block of the nanorods and the formation of a sharpened top, which is accompanied by a decrease in the photoluminescence intensity.
Overexpression of the recombinant IbpA protein from Acholeplasma laidlawii in Escherichia coli cells increases thermotolerance
Authors: Chernova L S , Fedorova M S , Vishnyakov I E , Kayumov A R 
Published: December 2020

Abstract
The presence of a gene encoding small heat shock protein IbpA in Acholeplasma laidlawii (AlIbpA) appears to be one of the key factors determining the high adaptive capabilities of this mycoplasma. Previously, we showed a participation of the N-and C-terminal regions of AlIbpA in functions of chaperone in vitro. The aim of this work was to establish the involvement of the N - and C-terminal motifs of the recombinant AlIbpA in the survival of Escherichia coli cells under temperature stress in vivo. To determine this, we used genetically engineered versions of the AlIbpA with truncations and mutations in the N - and C-terminal domains. Viability was determined by counting CFU and differential fluorescent staining. Studies have shown that hyperproduction of the N-termini-modified IbpA from AlIbpA is able to exhibit thermotolerance E. coli cells.
This research was funded by the Russian Science Foundation (project No. 17-74-20065), the microscopy assays were funded by RFBR (project № 20-34-90066).
Effect of Mn2+ and Ca2+ Ions on Formation of Structurally Ordered Nanoscale Complexes of DNA with Nuclear Proteins HMGB1 and H1
Authors: Chikhirzhina E V , Osinnikova D N , Polyanichko A M 
Published: December 2020

Abstract
The structural organization of DNA in complex with linker histone H1 and non-histone chromosomal protein HMGB1 in presence of calcium and manganese ions have been studied using FTIR and UV circular dichroism spectroscopy. We have demonstrated that the presence of calcium ions leads to the formation of highly ordered DNA-H1-HMGB1 structures, while manganese ions decrease the order in the earlier reported nanoscale complexes.
Determination of the fear coefficient by pupillograms
Authors: Isaeva O L , Boronenko M P , Zelensky V I , Kiseleva E S 
Published: December 2020

Abstract
Currently, various mathematical models of pupillograms are used to process the results of pupillometric studies. There are also mathematical models of emotions. At the moment, research does’nt combine modeling of pupillograms and modeling of emotions. In our work, an attempt was made to determine the fear coefficient by pupillograms. For research, an optoelectronic installation has been developed. As an example, we give an example of the analysis of pupillograms of people of an older age category. A mathematical model of the pupillogram plot is obtained, obtained in response to fear emotion.
Influence of PEDOT:PSS morphology on performance of bulk heterojunction solar cells
Authors: Loganchuk S M , Yatsenko A N , Varnavskaya A V , Miroshnichenko L G , Chebotarev S N , Irkha V A 
Published: December 2020

Abstract
Influence of morphology of poly(3, 4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) layer on performance of bulk heterojunction (BHJ) organic solar cells is analysed. Morphology depends on next technological factors: dispersity of PEDOT:PSS solution, substrate treatment, drying, PEDOT:PSS treatment. It is shown that samples with layer roughness less 10 nm have the best performance. Layer roughness was studied by atomic force microscopy (AFM).
Optical switching in multilayer structures based on Ge2Sb2Te5
Authors: Tolkach N M , Vishnyakov N V , Lazarenko P I , Sherchenkov A A , Sudakova A U , Nazimov D R 
Published: December 2020

Abstract
In this work, we have studied the phase switching in structures based on the Ge2Sb2Te5 (GST) composition and their optical parameters of reflectivity and transmissivity at 1550 nm wavelength after exposure to the pulse of nanosecond laser at 403 nm wavelength. We investigated 24 nm GST single-layer structure and found about 50% optical losses due to the double reflection and transmission at 1550 nm radiation. To achieve the least optical losses, we added additional SiO2, Si and Si3N4 layers to the structure. This allowed reducing optical losses up to 5 and 4% for absorption and undesirable reflection, respectively, for the amorphous GST layer, and 16 and 5% for absorption and undesirable transmittance, respectively, for the crystalline GST layer.
An optical method for research a magnetic track using speckles of the structure of scattered laser radiation
Authors: Logunov S E , Davydov V V , Rud V Yu , Glinushkin A P 
Published: December 2020

Abstract
A new method for detecting a magnetic track from a moving magnetic object is presented. The features of the formation of a magnetic track from a moving object at a depth are determined. A technique has been developed to research the nature of changes in the magnetic field in a magnetic track using ferromagnetic fluid. The optimal sizes of the ferrofluidic cell and the parameters of laser radiation are established. The results of experimental research are presented.
Investigation of microdisk and microring lasers based on InGaAs/GaAs QWDs by the interferometry method
Authors: Vinogradov A Yu , Moiseev E I , Kryzhanovskaya N V , Fominykh N A , Zubov F I , Kulagina M M , Mintairov S A , Kalyuzhnyi N A , Maximov M V , Zhukov A E 
Published: December 2020

Abstract
The scanning interferometer method is used to measure the line width of microdisk and microring lasers with a diameter of the resonator ranging from 15 to 50 μm and active area based on InGaAs/GaAs quantum well-dots. Above the threshold, the spectral width of the line did not exceed 3 pm for all samples under study.
Photoionization of polarized argon atoms in a magnetic field
Authors: Viktorov E A , Bezuglov N N , Klyucharev A N , Pastor A A , Serdobintsev P Yu , Khodorkovskii M A 
Published: December 2020

Abstract
Ionization of three-photon excited polarized states of argon atoms by circularly polarized probe light was studied in a supersonic beam. The revealed oscillation structure in the observed photoionization signals due to the Larmor precession of excited atomic states in a magnetic field allowed finding novel data for the Landé g-factors. We derived analytical formulas for the photoelectron current and explained the various types of the detected oscillations in terms of the principal lines among multiplet components of optical transitions. Our results indicate the possibility of implementing Doppler-free spectroscopy involving bound-free transitions.
The study of radiation attenuation in disordered silver nanoparticles arrays formed by dry aerosol printing
Authors: Khabarov K M , Efimov A A , Ivanov V V 
Published: December 2020

Abstract
The interaction processes of continuous laser radiation with wavelengths 527 and 980 nm with disordered arrays of spherical silver nanoparticles formed by dry aerosol printing are studied. The arrays were deposited on a glass substrates in the form of lines of various thickness and differed in the mean sizes of nanoparticles. It is shown that the radiation attenuation by arrays with disordered nanoparticle structure depends on the optical effects both on isolated spherical nanoparticles and on nanoparticle agglomerates.
Developing of NbN films for superconducting microstrip single-photon detector
Authors: Manova N. N. , Simonov N. O. , Korneeva Yu. P. , Korneev A. A. 
Published: December 2020

Abstract
We optimized NbN films on a Si substrate with a buffer SiO2 layer to produce superconducting microstrip single-photon detectors with saturated dependence of quantum efficiency (QE) versus normalized bias current. We varied thickness of films and observed the maximum QE saturation for device based on the thinner film with the lowest ratio R

S

300/R

S

20.
Features of the construction of fiber-optic communication lines with code division multiplexing
Authors: Popovskiy N I , Davydov V V , Valiullin L R 
Published: December 2020

Abstract
The necessity of research of the fiber-optic communication lines with code division multiplexing is justified. The structural diagrams of transmitters and signal receivers of fiber-optic communication lines with code division multiplexing is presented. The features its design are established. The investigation results are presented.
Near-infrared photoluminescence and micro-Raman study of spark discharge germanium nanoparticles
Authors: Malo D , Lizunova A A , Ramanenka A A , Masnaviev B I , Solovey V R , Ivanov V V 
Published: December 2020

Abstract
We report the investigation of near-infrared (NIR) photoluminescent and structural properties of aerosol germanium nanoparticles, synthesized by spark discharge method followed by sintering in a tube furnace at different temperatures varying from 25 to 750 °C. We demonstrate a growth of mean primary particle size and change in morphology from agglomerates of germanium nanocrystals in amorphous matrix to individual pure crystal germanium nanoparticles with temperature increase. Pure germanium nanoparticles were prepared at temperatures above 600 °C and distinguished by absence of near-infrared photoluminescence. According to Raman spectroscopy the presence of amorphous germanium in the samples, sintered at 25 to 450 °C, leads to appearance of the luminescence in infrared region with intensity increase from 1100 to 1550 nm.
Feature of Optical Soliton Sequence Propagation in Single-Mode Fiber
Authors: Andreeva E I , Potapov I A 
Published: December 2020

Abstract
Estimates of information capacity of the optical system as product of maximum data rate in single soliton channel and long span distance are considered. The linear (fiber group velocity dispersion and optical losses) and nonlinear (self-phase modulation and Raman self-frequency shift) effects, the signal/noise ratio of pulse source are included in pulse evolution description. It was shown, that maximum optical system capacity can be achieved with NZDS-fiber.
Effective absorption coefficient of a graphene atop of silicon nitride nanophotonic circuit
Authors: Komrakova S , Kovalyuk V , An P , Golikov A , Rybin M , Obraztsova E , Goltsman G 
Published: December 2020

Abstract
In this paper, we demonstrate the results of a study of the optical absorption properties of graphene integrated with silicon nitride O-ring resonator. We fabricated an array of O-ring resonators with different graphene coverage area atop. By measuring the transmission spectra of nanophotonic devices with and without graphene, we calculated the effective absorption coefficient of the graphene on a rib silicon nitride waveguide.
Near-electrode polarization and determination of the mobility of intrinsic charge carriers in PVDF films
Authors: Borisova M E , Kamalov A M , Jayasinghe B M D N S 
Published: December 2020

Abstract
The process of near-electrode polarization in a polyvinylidene fluoride (PVDF) film was studied using reverse currents Irev(t). It was proven that the maxima on the Irev(t) curves are characteristic of near-electrode polarization. The dependences of the reversal currents on time were analyzed based on various representations. The mobilities of the intrinsic charge carriers in the film and the magnitude of the charge transferred through the dielectric layer from electrode to electrode were calculated. The conductivity of PVDF was studied and analyzed in the temperature range 90°C-130°C.
Research of low noise pHEMT transistors in equipment for microwave radiometry using numerical simulation
Authors: Tikhomirov V G , Gudkov A G , Agasieva S V , Yankevich V B , Popov M K , Chizhikov S V 
Published: December 2020

Abstract
The numerical impact modeling of some external effects on devices based on AlGAs/InGaAs/GaAs heterostructures (pHEMT) was carried out. The mathematical model was created that allowed to predict the behavior of the drain current depending on condition changes on the heterostructure in the barrier region and to start the process of directed construction optimization of the devices based on AlGaAs/InGaAs/GaAs pHEMT with the aim of improving their noise characteristic.
dV/dt testing of high voltage 4H-SiC Schottky diodes with different types of metal-polymeric packages
Authors: Knyginin D A , Rybalka S B , Kulchenkov E A , Demidov A A , Zhemоedоv N A , Drakin A Yu 
Published: December 2020

Abstract
The dV/dt values for 4H-SiC Schottky type diodes with different type packages have been determined experimentally. It is determined that experimental dV/dt values for 4H-SiC Schottky type diodes in metal-polymeric packages (SOT-89, QFN, PQFN, TO-220) are varying in interval of 645¸1103 V/ns. It is established that the dV/dt dependence on maximal amplitude of reverse voltage demonstrate nonlinear character (close to parabolic dependence) for all studied SiC Schottky type diodes in different type packages.
Simulation of one-dimensional van der Waals heterojunction formed by a carbon nanotube embedded into MoS2 nanotube
Authors: Timkaeva D. A. 
Published: December 2020

Abstract
The concept of van der Waals (vdW) heterostructures provides a wide range of possibilities of combining two-dimensional (2D) layered materials for heterogeneous integration at atomic level without the constraint of lattice matching. The resulting structures exhibit unique physical properties and are promising for nanoelectronic and photonic applications. Recently, the concept of vdW heterostructures has been extended to 1D materials, and coaxial heteronanotubes have been synthesized. In the present work, we simulate a one-dimensional vdW heterojunction based on a carbon nanotube (semiconducting or metallic) embedded into a uniaxial MoS2 nanotube. Using first-principles methods, electron difference density and transmission spectra are calculated for two vdW junctions at room temperature. The considered systems can serve as a nanodiode with controlled width of a space charge region.
Nonradiative recombination channel of dark excitons in colloidal CdSe nanoplatelets
Authors: Golovatenko A A 
Published: December 2020

Abstract
Nonradiative recombination channel of spin-forbidden dark excitons in colloidal 4 ML thick CdSe nanoplatelets synthesized in argon and ambient atmosphere is revealed by theoretical analysis of time-resolved photoluminescence. The nonradiative recombination lifetime τnr ≈ 11 ns is found to be independent on nanoplatelets synthesis atmosphere. It is shown that the presence of the nonradiative recombination channel affects spin polarization of dark excitons and results in the time dependence of the circular polarization degree of photoluminescence in the external magnetic field.
Design and simulation high aspect ratio torsion suspension of MEMS z-axis accelerometer
Authors: Lysenko I E , Naumenko D V , Ezhova O A 
Published: December 2020

Abstract
This paper presents new design torsion suspension of MEMS z-axis accelerometer. These prototypes Z-axis accelerometer are based on pantograph lever structure is out-of-plane devices. The results of finite element analysis of the structure are presented.
Polymer-salt synthesis of Gd2O3:Nd3+ nanophosphors
Authors: Kuzmenko N K , Evstropiev S K , Aseev V A , Danilovich D P , Nikonorov N V , Ignatiev A I , Matrosova A S , Demidov V V , Emerson A V , Sevastyanova I M 
Published: December 2020

Abstract
The paper describes aspects of Gd2O3:Nd3+ phosphors synthesis by the liquid polymer-salt method. The double role of polyvinylpyrrolidone as an organic solvent was revealed in the process of highly-luminescent cubic nanocrystals formation. The developed technique was applied for modification of a hollow-core anti-resonant optical fiber by thin films based on the synthesized material without any structural and phase transformations of Gd2O3 nanocrystals after the fiber drawing process.
Electrical characterization of nitride silicon layers SiN:x enriched in silicon at different stoichiometry - photovoltaic application
Authors: Boudjemila L , Mahmoudi B , Khenfer Kh , Krasnoschekov V V , Rud’ V Yu , Davydov V V , Valiullin L R 
Published: December 2020

AbstractThe main objective of researches in the field of photovoltaic is to increase the efficiency. This work aims a new concept which is the integration of nanoparticles in the anti-reflection layerSi3N4 (silicon nitride), in order to improve the performance of solar cells. This concept is based on the up conversion, where the nanoparticles are characterized by the ability to function as a converter of infrared rays having high energies in the receptivity in the visible. The concept of conversion leads to a better exploitation of the solar spectrum, by widening the useful range of the spectrum. Firstly, we realized SiNx layers at different compositions and proved that variation by calculating the silicon excess and the gap energy. But the focus is on the analysis of photocurrent measurements for the vertical and lateral configuration to show the role of nanparticules. And we finalize with measurement of currents at the test bench I-V to find the ideal stoichiometry for nanoparticles.
The Study of Mambong Clay Properties Improvement with Calcium Carbonate Addition
Authors: Bakar Nurul Ainon , Mohamed Julie Juliewatty , Sulaiman Muhammad Azwadi , Muhammad Nik Maheran Nik 
Published: December 2020

Abstract
Mambong pottery is a unique heritage of Kelantan state with its own identity and features. However, the fabrication technique of this pottery can be improved to gain the product quality in terms of its properties. The additional of CaCO3 as an additive opens the opportunities to improve the properties of this pottery. Four different compositions which are 0%, 5%, 10%, and 15% of CaCO3 were used in 12 hours firing duration. The slip casting method was used in this research as the modern fabrication technique. The aim of this research is to study the Mambong clay properties improvement with different compositions of CaCO3 addition.
The Effect of Bismuth Addition on Sn-Ag-Cu Lead-Free Solder Properties: A Short Review
Authors: Muhamad M , Masri MN , Nazeri MFM , Mohamad AA 
Published: December 2020

Abstract
Sn-0.7Ag-0.5Cu lead-free solder is an alternative solder material suitable to replace Sn-Pb solder in electronic manufacturing. In this review, the change in the microstructure, elements, the structural and melting point of Sn-0.7Ag-0.5Cu after the addition of different compositions of bismuth were discovered. Besides, the influence of bismuth in lead-free solder alloys attracts to be studied due to its capability to improve the wettability and solder spread.
Degradation Kinetics of Humic acid in Aqueous Solution by Ozonation Treatment under Different Parameter Conditions
Authors: Mahyun Zafirah , Shoparwe Noor Fazliani , Abdullah Ahmad Zuhairi , Ahmad Abdul Latif , Mohamad Mardawani , Yusoff Abdul Hafidz 
Published: December 2020

Abstract
This study evaluated the kinetics of humic acid (HA) degradation in aqueous solution by ozonation process under different parameter conditions. The effect of initial HA concentration (5 to 100 mg/L), solution pH (2 – 12) and initial ozone doses (1.6– 4.9 mg/L) of HA degradation were evaluated through batch ozonation processes at ambient temperature for 2 hours. The HA degradation followed pseudo-first order kinetics where the rate constant changed based on these parameters effect. Results showed that, the HA degradation by ozonation process was more effective (98% degradation) at 20 mg/L initial HA concentration, initial pH 7 and 4.9 mg/L of ozone dose. These finding suggest that the ozonation process can be effectively used in wastewater treatment for improving the biodegradability of recalcitrant organic compounds.
Raw and acetylated Sugarcane Bagasse (Saccharum officinarum) and Rubber wood (Hevea brasiliensis) in oil spill sorption at Pantai Kuala Perlis
Authors: Anuwar Nur Aina Annisa , Ameram Nadiah 
Published: December 2020

Abstract
In this research, raw and modified (acetylated) sugarcane bagasse (SGB) (Saccharum officinarum) and rubber wood (RB) (Hevea brasiliensis) were used as sorbents in oil sorption to absorb the used oil in the seawater sample at Pantai Kuala Perlis. The research is done using different time which are 5, 10 and 15 minutes with different thickness of oil layer which are 10 and 20 ml, using 2 g of sorbents. In the percentage of oil removal and oil sorption capacity, 15 minutes was chosen as optimum adsorption time and 10 ml as optimum oil thickness. In term of effect of adsorption time, for overall results, the longer the adsorption time, the higher the sorption capacity and percentage removal of oil. Meanwhile, in term of effect of oil layer thickness, the lower the thickness of oil layer, the higher the sorption capacity and percentage removal. For Fourier Transform Infrared Spectroscopy (FTIR), the spectroscopic data shown that both modified SGB and RB had O-H, CH3 and C=O functional group at the range of 3000-3500, 2500-3000 and 1500-2000 cm-1 respectively. These shown that modified RGB and RB had successfully synthesized. For salinity test, there were no significance different between the initial salinity and after-adsorption salinity of the seawater sample.