bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study of the impact of amino acids hydrochloride forms on the formation of biomimetic composites in the presence of nanocrystalline hydroxyapatite
Authors: Goloshchapov D , Kashkarov V , Nikitkov K , Bartenev V , Ippolitov I , Ippolitov Yu , Seredin P 
Published: December 2020

Abstract
The study of molecular composition of the biomimetic composites on the basis of nanocrystalline carbonate-substituted (C-HAP) and polar amino acids of L-lysine hydrochloride and L-arginine hydrochloride was performed in the work. Results of the study show that the change in acidity of the medium (pH≥11.2, ≥7.55 и ≤5) occurs under transformation of the conformational environment of L-lysine hydrochloride molecules with the formation of L-lysine structure as while increase of pH level as in the presence of C-HAP nanocrystals. At the same time composites basing on L-arginine keep their amorphous structure in the presence of synthesized C-HAP in the different media. The detected differences in the molecular environment of hydrochloride forms of amino acids during the interaction with nanocrystalline C-HAP prove to be significant for the development of technology of the integration between biocomposites and hard dental tissues.
Interaction of low-temperature atmospheric pressure plasma jet mixed with argon and air with living tissues
Authors: Ashurbekov N A , Giraev K M , Shakhsinov G Sh , Israpov E Kh , Isaeva Z M , Murtazaeva A A , Rabadanov K M 
Published: December 2020

Abstract
The paper presents the results of spectral-fluorescence and diffuse-optical studies of biological tissues when exposed to a low-temperature atmospheric pressure plasma in a mixture of air with argon with an exposure of up to 10 minutes. Potential fluorophores were identified and the coefficients of optical absorption and transport scattering of biological tissues were determined. The analysis conducted allows to conclude that plasma probing leads to significant inhibition of cellular respiration and the development of coagulation effects in biological tissues.
Effect of sodium hypochlorite on the structure of nucleic acids studied using infrared spectroscopy
Authors: Osinnikova D N , Moroshkina E B , Polyanichko A M 
Published: December 2020

Abstract
The effect of sodium hypochlorite (NaClO) on nucleic acids (NAs) was investigated depending on the concentration of the NaClO. We have performed detailed analysis of the FTIR and UV spectra of the NAs incubated with NaClO. It was found that both the destruction of the secondary structure of DNA (denaturation) and the chemical modification of nitrogenous bases occur.
Mathematical model of neuronal membrane mechanical deformations under the influence of an electric pulse
Authors: Kotikova M R , Chizhov A V 
Published: December 2020

Abstract
Mechanical deformations of neuronal membrane occur when exposed to an electrical pulse. A one-dimensional mathematical model of such deformations of a cylindrical cell is proposed, based on the fluid dynamics equations and the Lippmann equation connecting electric effects with the membrane strength. The model qualitatively reproduces experimentally observed effects of cell membrane mechanical deformations evoked by both an action potential moving along axon and an electric pulse injected through electrode.
Si-W alloy thin films deposition by magnetron co-sputtering
Authors: Serdobintsev A A , Starodubov A V , Kozhevnikov I O , Galushka V V , Pavlov A M , Ryskin N M 
Published: December 2020

Abstract
Results of experimental studies on Si-W coatings fabrication by magnetron co-sputtering from two sources for electrodynamic structures in millimeter and submillimeter range of electromagnetic waves are presented. Control over sheet resistivity of the resulting coatings by varying the power of a magnetron with a tungsten target is demonstrated. Dependence of complex permittivity of Si-W coatings upon dielectric substrates on chemical composition in the frequency range of 50-70 GHz is studied.
Observation of the increase in turn-on delay of quantum cascade lasers under pulsed electrical pumping with finite rise time
Authors: Cherotchenko E D , Dudelev V V , Mikhailov D A , Losev S N , Babichev A V , Gladyshev A G , Novikov I I , Lutetskiy A V , Veselov D A , Slipchenko S O , Pikhtin N A , Karachinsky L Ya , Denisov D V , Kuchinskii V I , Kognovitskaya E A , Egorov A Yu , Teissier R , Baranov A N , Sokolovskii G S 
Published: December 2020

Abstract
We demonstrate the experimental measurements of the turn-on delay in InAs-and InP-based quantum cascade lasers operating under pulsed electrical pumping with non-zero rise time. We report the unexpected delay time dependence on the pumping current density, that does not agree with available theoretical predictions. Performed numerical simulation of the model based on rate equations is only in qualitative, but not quantitative, agreement with our observations.
DLTS spectra of radiation-induced defects in silicon detectors with heavily damaged Bragg peak region
Authors: Mitina D , Eremin V , Verbitskaya E , Eremin I 
Published: December 2020

Abstract
The investigation is focused on the defects in silicon p+-n-n + detectors irradiated with the 53.4 MeV 40Ar ions, which generate a nonuniform defect distribution including a heavily damaged region inside the Bragg peak. The dependences of the bulk generation current and of the capacitance on bias voltage and the spectra of radiation-induced defects demonstrate new features: a step in the current rise, a region with a practically constant capacitance, and abnormal dependence of the peak amplitudes of vacancy-related defects on fluence. The changes of the DLTS spectra are assigned to the influence of silicon properties inside the Bragg peak region acting as a highly compensated insulating layer.
Defect structure evolution in the process of relaxation of the Pd-Y-H system
Authors: Akimova O V , Veligzhanin A A , Svetogorov R D , Gorbunov S V , Roshan N R , Burkhanov G S 
Published: December 2020

Abstract
X-ray diffraction and high-precision scanning electron microscopy methods were used to study the long-term evolution of the defect structure of diffusion filter-membranes Pd-Y. Analysis of X-ray diffraction data and microelectronic photographs showed that the recovery of the dislocation structure in the membranes was not uniform. Differences in the processes of hydrogen conservation in the structure of membranes are determined reversible hydrogen doping. Preservation by alloy of superstructural ordered regions was detected.
Investigation of a reaction-diffusion system, related to retinal patterning
Authors: Rukolaine S A , Varsh S E 
Published: December 2020

Abstract
In this paper we study a one-dimensional spatially-continuous reaction-diffusion system, related to patterning of Drosophila’s retina. We search for conditions of stability or diffusion-driven (Turing) instability of a homogeneous prepattern steady state.
Atomic force microscopy of porous ferroelectric PZT films
Authors: Gushchina E V , Zaitseva N V , Delimova L A , Orlov G A , Seregin D S , Vorotilov K A 
Published: December 2020

Abstract
The surface topography, local current distribution and piezoresponse signal in porous ferroelectric PZT films are studied using conductive atomic force microscopy (c-AFM) and piezoforce microscopy (PFM). The PZT films were formed from solutions with the addition of 0–20 wt% polyvinylpyrrolidon (PVP) as a porogen with the molecular weight of 360000. Applying c-AFM, the topography images and distribution maps of the local current of the same surface area are obtained, which made it possible to compare the profiles of the topography and current signals. It is shown that in PZT films prepared without PVP addition, the local currents flow inside the grains forming the columnar structure with nonconductive grain-boundaries. At PVP content of 1-3 wt%, separate current peaks are observed on the analyzed profiles, but starting from 6 wt% PVP and higher, the local current flowing in the pore regions exceeds the current recorded in the grain area.
The composition modulation effect during spinodal decomposition of ZnxCd1-xTe solid solutions under conditions of energy resonance
Authors: Kuznetsov V V , Moskvin P P , Skurativskyi S I , Stepchin Y A , Efremov Yu M 
Published: December 2020

Abstract
The Cahn-Hillard equation, previously obtained to describe the decomposition of metal solid solutions, is adapted to analyze the spinodal decomposition of A2B6 semiconductor solid solutions. The obtained differential equation is used to describe the spinodal decomposition of the ZnxCd1-xTe solid solution, which is synthesized under conditions close to the boundaries of absolutely unstable regions on the state diagram of the system. A quantitative description of the composition modulation effect that appears in the material when its growth under the indicated conditions is given.
Computer simulations of the spinodal decomposition of the ZnxCd1-xTe solid solution showed that micro oscillations of the material composition are connected by the resonance phenomenon between the excess mixing energy and the energy of elastic strains arising in the inclusions of the new phase coherently conjugated with the lattice of the initial crystal. It is shown that such resonance phenomena are most intense when the conditions for the material synthesis are chosen in the immediate vicinity of the spinodal curves in the phase state diagram of the system.
Anisotropy of local anodic oxidation process in thin MoSe2 films
Authors: Borodin B R , Benimetskiy F A , Dunaevskiy M S , Alekseev P A 
Published: December 2020

Abstract
In this work, various regimes of local anodic oxidation (LAO) of MoSe2 were studied. Here we show that there is a certain set of oxidation parameters that results in the anisotropic oxidation of MoSe2. In this mode, LAO leads to the formation of oxidized triangles. The triangles have the same orientation on the surface of the flakes, which indicates that MoSe2 is oxidized mainly along the crystallographic directions of the zigzag edges. These results can be useful for determining crystallographic directions of zigzag/armchair edges and the degree of single-crystallinity of MoSe2 flakes.
Design of silicon membranes for ultrasonic transducers and its fabrication by anisotropic wet etching
Authors: Malohatko S V , Gusev E Yu , Jityaeva J Y , Ageev O A 
Published: December 2020

Abstract
The aim of this work is to calculation and fabrication silicon membranes for acoustic sensors with operating ranges of resonant frequencies from 10 kHz to 100 MHz and pressures from 0.1 to 103 kPa. In this paper, analytical dependences of pressure and resonance frequency on geometrical parameters of membranes are presented. The ranges of the thickness (30-50 μm) and the length of the edge membranes (0.2-1.0 mm) were defined. Experimental studies of the etching of the silicon wafer with a solution of 30% KOH were carried out and the etching rate was found to be 1.2-1.8 μm/min. Anisotropic wet etching was used to form square-shaped silicon membranes with a thickness of 30-50 μm and an edge length of 0.2 to 1.0 mm with resonant frequencies in the range of 0.7 to 30 MHz. The obtained results can be used in the development of acoustic sensors based on of monocrystalline silicon.
Current transfer mechanisms in polyvinyl alcohol films with inclusions of multi-walled carbon nanotubes
Authors: Vasin S V , Efimov M S , Sergeev V A , Frolov I V 
Published: December 2020

Abstract
Current-voltage and capacitance-voltage characteristics of polyvinyl alcohol (PVA) films with the inclusion of multi-walled carbon nanotubes (MWCNT) deposited on silicon and ITO substrates were experimentally studied. It is shown that such structures demonstrate rectifying properties and their current-voltage characteristics are nonlinear. With direct bias, the structures have a positive temperature coefficient of resistance (TCR). With a reverse bias, the sign of TCR changes from negative to positive. A qualitative analysis of the results based on the tunneling mechanism of current transfer is presented.
Spectral properties of novel transparent glass-ceramics based on Fe2+:ZnAl2O4 nanocrystals
Authors: Eremeev K , Dymshits O , Alekseeva I , Khubetsov A , Zapalova S , Tsenter M , Basyrova L , Loiko P , Zhilin A , Popkov V 
Published: December 2020

Abstract
Transparent glass-ceramics of the zinc aluminum silicate system nucleated by TiO2 and doped with FeO were developed by melt-quenching at 1580 °C with subsequent secondary heat-treatments at 720 – 1050 °C. The glass-ceramics based on nanosized gahnite crystals were characterized by X-ray diffraction, Raman and optical spectroscopy. The glass-ceramics exhibit a broad (1.5-2.5 μm) absorption due to the 5E → 5T2 (5D) transition of Fe2+ ions in Td sites in gahnite crystals. They are promising as saturable absorbers of the short-wave IR lasers.
Synthesis and study of the gas sensitive properties of composite thin films of copper oxide and linear chain carbon
Authors: Smirnov A V , Kazakov V A , Platonov P S , Tyunterov E S 
Published: December 2020

Abstract
The possibility of synthesizing semiconductor films of copper oxide and films of copper oxide with linear chain carbon, which have good sensitivity to methanol and ethanol vapors, is shown in the work by a thermoresistive method. The proposed gas sensitivity mechanism describing the increase in resistance in methanol and ethanol vapors shows good agreement with the obtained experimental results.
X-ray diffraction study of a tungsten-based material for the first wall of ITER
Authors: Kozushkina A , Pavlov S I , Voronin A V , Sokolov R V , Levin A A 
Published: December 2020

Abstract
Methods of X-ray diffraction (XRD), Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy were applied to POLEMA W sample after He plasma irradiation. The W reflections of the plasma treated sample exhibit an evident asymmetry characterized by a negative asymmetry parameter. Using the Williamson-Hall Plot technique the XRD reflection asymmetry has been successfully quantitatively described in frame of a model with two W phases with slightly different unit cell parameters and essentially different crystallite size and microstrain values.
Production of K*(892)° mesons in Cu+Au collisions at

sNN

= 200 GeV and U+U collisions at

sNN

= 192 GeV
Authors: Berdnikov A Ya , Berdnikov Ya A , Borisov V S , Kotov D O , Mitrankov Iu M 
Published: December 2020

Abstract
Studying the properties and evolution of the QGP is one of the main goals in modern heavy ion physics. Due to strange quark content K*0
meson is a good probe for the study of QGP formed in heavy-ion collisions. K
*0-meson production was previously measured by PHENIX in symmetric Cu+Cu collisions at

s

N
N

= 200 GeV and U+U collisions at

s

N
N

= 200 GeV. K
*0-meson production in asymmetric Cu+Au collisions at

s

N
N

= 200 GeV and U+U collisions at

s

N
N

= 200 GeV and spherically asymmetric uranium nuclei at

s

N
N

= 200 GeV and U+U collisions at

s

N
N

= 192 GeV was performed for continuation the study of the QGP properties. This report presents invariant transverse momentum spectra and nuclear modification factors of K
*0-mesons which were measured in Cu+Au collisions at the energy of

s

N
N

= 200 GeV and U+U collisions at

s

N
N

= 200 GeV and U+U collisions at the energy of

s

N
N

= 200 GeV and U+U collisions at

s

N
N

= 192 GeV. In results, K
*0-mesons yields are less suppressed than the yields of non-strange mesons, which might indicate that additional particle production mechanisms are involved in the K
*0-meson production. The production of the K
*0-mesons in Cu+Cu, Cu+Au, and U+U collisions scales with Npart
and seems to depend on nuclear overlap size, but not on its geometry.
Investigation of the stability of spatial modes in quarter-disk resonators
Authors: Dunaevskiy M S , Alekseev P A 
Published: December 2020

Abstract
In this work, the stability of short-wavelength spatial modes in quarter-disk cavities was studied. It was found that in such resonators, short-wave modes (with wavelengths λ smaller than the radius R of the quarter-disk λ<<R) in space form figures similar to folded twice m-polygons. The m-order of allowed stable modes decreases rapidly with an increase in the δ/R parameter of deviation from the ideal quarter-disk shape. Unlike half-disk resonators, quarter-disk resonators with δ/R>0.1 lack total internal reflection modes.
The study of gadolinium tantalum niobate (Gd(NbxTa1-x)O4) by local cathodoluminescence technique
Authors: Gusev G A , Masloboeva S M , Zamoryanskaya M V 
Published: December 2020

Abstract
In this work, the powder and ceramic samples of gadolinium tantalum niobate (Gd(NbxTa1-x)O4) grown by the liquid-phase method were studied. Phase homogeneity and composition were determined by x-ray diffraction analysis and electron probe microanalysis. Luminescent properties were studied by local cathodoluminescence technique. All samples obtained a high phase homogeneity. It was found that the dependence of the monoclinic lattice parameters on the niobium content in the niobium-tantalum pair has monotonic character. The solid solutions were formed at synthesis temperatures from 1180 to 1400°C. The sample of pure gadolinium niobate (GdNbO4) showed the maximal cathodoluminescence intensity.
Investigation of the temperature dependences of the I-V characteristics of p-Si/MoOx selective contacts
Authors: Maksimova A A , Baranov A I , Kudryashov D A , Gudovskikh A S 
Published: December 2020

Abstract
In this article the temperature dependences of selective contacts based on MoOx were studied. The p-Si/MoOx/Al structure was fabricated. Current-voltage and capacitance-voltage characteristics in the temperature range from 80 to 300K were measured. Band diagram was also calculated to reveal potential barriers location and its influence on charge carrier transport.
Absorbance and transformation of SHF electromagnetic waves in quartz-containing heterogenic materials
Authors: Makhmudov Kh F 
Published: December 2020

Abstract
A study of the mechanism of uptake and conversion of microwave energy into heat energy is presented. The term ”SHF – trigger”, which activates at the atomic, electronic, and molecular scales, is introduced for the mechanism of micro cracking, destruction, and crashing of quartz-containing rocks. It has been found that the uptake and conversion of microwave energy into heat energy begins there were some criteria of the sample instability in energy consummation are satisfied. This mechanism of the energy conversion with the heating effect differs from other modes of heating by its efficiency; accordingly, a special criterion is required. The loss tangent of a dielectric, such as mineral or heterogeneous rock, could serve as a measured parameter. This parameter is attributed to slowly establishing modes of relaxation, which manifest themselves in the presence of polar molecules, complicated anion radicals, chemically bounded water, solid/liquid interfaces, borders of dielectrics and conductors. In addition, a new mechanism of conversion of microwave energy into heat energy in points of contact between water-saturated pores in model specimens was suggested.
Conductivity of a superlattice based on the semi-Dirac crystals
Authors: Kryuchkov S V , Kukhar E I , Nikolaeva L N 
Published: December 2020

Abstract
The current-voltage characteristic of a superlattice based on the semi-Dirac crystals has been studied. The case of the absence of a gap between valence and conduction mini-band has been considered. Such a superlattice has been shown to be characterized by both semi-metal and narrow-band semiconductor electrical properties. From the one hand there is the point in the Brillouin zone close to which the depletion of the states occurs without gap opening. From the other hand there is the portion of negative differential conductivity in the current-voltage characteristic. The dependences of longitudinal conductivity and maximum of the current-voltage characteristic on the Fermi energy have been investigated.
Scattering of spatially bounded X-ray beams in lateral periodic structures
Authors: Kazakov D V , Punegov V I 
Published: December 2020

Abstract
The dynamical theory of X-ray diffraction is developed to the case when the incident and reflected X-ray beams are spatially bounded. X-ray diffraction in complicated lateral periodic structures is considered. Effects, due to periodic regular elastic deformations of a crystal lattice on an angular distribution of the scattered intensity, are investigated. Using the found solutions, numerical simulations of reciprocal space maps for crystals with periodically distributed elastic strains were performed. It was established, that for crystals modulated by a surface acoustic wave, diffraction orders consist of the main reflection vertical band and a pair of inclined bands, induced by spatially bounded X-ray beams. In the case of diffraction in crystals with the surface grating, one observes additional satellites along inclined bands caused by the spatial modulation of incident X-ray wave. Results of X-ray diffraction on a crystal modulated by a surface acoustic wave and on a crystal with a metal surface grating are presented.
THz gas discharge in nitrogen as a source of ultraviolet radiation
Authors: Sidorov A V , Glyavin M Yu , Luchinin A G , Razin S V , Vodopyanov A V 
Published: December 2020

Abstract
This work presents the results of investigation of THz gas discharge in inhomogeneous flow of nitrogen. As a source of sub-millimetre radiation we used 40 kW@670 GHz gyrotron created in IAP RAS. It is shown that, despite the tendency of the discharge in electromagnetic wave beams to propagate towards the heating radiation from the breakdown region, in the case of a strongly inhomogeneous gas flow (nitrogen in our case), conditions can be created under which the discharge practically does not propagate and becomes point-like. The features of the glow of a THz discharge in a nitrogen flow in a wide range of background gas pressures are studied. The presence of a powerful afterglow in some bands of the second positive system of nitrogen at high pressures was demonstrated. The prospects of using such a discharge as a source of UV radiation are discussed.
Etching of Si3N4 by SF6/H2 and SF6/D2 plasmas
Authors: Pankratiev P A , Barsukov Yu V , Kobelev A A , Vinogradov A Ya , Miroshnikov I V , Smirnov A S 
Published: December 2020

Abstract
Selective plasma etching of silicon nitride (Si3N4) over silicon oxide (SiO2) is one of critical steps in the nanofabrication processes, where a direct plasma etching of Si3N4 is required for some applications. It was reported recently that Si3N4 etching by remote plasma source can be initiated by the vibrationally excited HF(v) molecules at the low concentration of atomic fluorine. Generally, the main source of HF(v) in plasma is reaction of atomic fluorine with H2 molecule. Due to this fact, the kinetic isotope effect should be observed during Si3N4 etching if replace the H2 source gas on deuterium gas (D2). The data presented here are the Si3N4 and SiO2 etching by the SF6/H2 and SF6/D2 plasmas. A different amount of H2 and D2 have been added to the SF6 discharge during the Si3N4 and SiO2 etching. It was shown that at low H2/D2 flow rate the Si3N4 etch rate is lower in the SF6/D2 discharge. This one confirms the hypothesis about Si3N4 etching by HF(v) and indicates on the fact that HF(v) gives contribution to Si3N4 etching by the direct plasma (not only by the remote plasma) at relatively high concentration of atomic fluorine.