bluuebunny/crossref_metadata_2025_split huggingface dataset:
Molecular modeling of post-diffusion stage of biotissue optical clearing under effect of iohexol aqueous solution
Authors: Shagautdinova I T , Likhter A M , Berezin K V , Dvoretsky K N , Nechaev V V , Tuchin V V 
Published: December 2021

Abstract
Interaction of iohexol (Omnipaque), an X-Ray contrast agent, with a mimetic peptide of collagen (GPH)3 as one of the main components of biological tissues has been studied with the use of methods of classical molecular dynamics (GROMACS). Complex molecular modeling of the post-diffusion stage of optical clearing allowed to evaluate such parameters as the average number of hydrogen bonds, formed between the clearing agent and collagen per unit time, and the immersion agent’s effect on changes in the collagen peptide volume. The obtained results are compared with similar results for glycerol, a polyatomic alcohol, and with the existing experimental data on the efficiency of optical clearing of these immersion agents.
Study of low-temperature exposure on biotissue using an elongated cryoapplicator
Authors: Pushkarev A V , Andreev N A 
Published: December 2021

Abstract
The article presents the results of a study of low-temperature exposure on animal biological tissue using the novel prototype of a liquid nitrogen cryoapplicator. The data obtained are compared with the cryoapplicator characteristics cooled by nitrogen dioxide that are currently used for the atrial fibrillation treatment. Data analysis confirmed the liquid nitrogen cryoapplicators effectiveness and made it possible to highlight their advantages.
Surface modification of polyimide film in the barrier discharge for cellular technologies
Authors: Kamalov A M , Celujko K S , Kolbe K A , Smirnova N V , Borisova M E , Bondarenko P N , Vaganov G V , Didenko A L , Yudin V E 
Published: December 2021

Abstract
In this work, the surface of polyimide films of PMDA-ODA was modified using a barrier discharge in order to optimize their biological properties when interacting with a culture of human dermal fibroblasts. The optimal modes of processing films in a gas discharge, which allows to increase the proliferative activity of cells, are found.
Protein secondary structure analysis of serum from patients with oncohematological diseases
Authors: Mikhailets E S , Chernyshev D A , Telnaya E A , Plotnikova L V , Garifullin A D , Kuvshinov A Y , Voloshin S V , Polyanichko A M 
Published: December 2021

Abstract
One of the promising approaches for diagnosing oncohematological diseases is infrared spectroscopy of blood serum. In this work secondary structure of blood serum proteins of patients with multiple myeloma, chronic lymphocytic leukemia and healthy donors was studied using IR spectroscopy. As a result of the study, it was found that the secondary structure of blood serum proteins in patients with chronic lymphocytic leukemia does not change in comparison with healthy donors. In contrast, patients with multiple myeloma have significant differences in the secondary structure composition of serum proteins compared to healthy donors. We conclude, that IR spectroscopy makes it possible to distinguish serum of healthy donors and patients with multiple myeloma, leading to the potential applicability of this approach to the diagnosis of multiple myeloma.
Possibility of Raman spectroscopy method use for evaluation of periodontitis-affected tooth enamel before and after open curettage
Authors: Timchenko P E , Timchenko E V , Bazhutova I V , Frolov O O , Volova L T , Ionov A Y 
Published: December 2021

Abstract
The results of the research of enamel of periodontitis-affected teeth before and after open curettage are presented in the work. The Raman spectroscopy method was used as an evaluation method of curettage influence on tooth enamel. Chemometric analysis of the Raman spectra of tooth enamel before and after curettage was made. Spectral changes of tooth enamel were detected. It was found that after the procedure of open curettage spectral changes occur in tooth enamel related to the changes in mineral composition and organic matrix forming.
Physical model for effects of microwaves on nucleoids in living cells: role of carrier frequency, modulation and DC and AC magnetic field
Authors: Matronchik A Y , Belyaev I Y 
Published: December 2021

Abstract
The effect of static and alternating magnetic fields on the conformation of nucleoids in cells of different types is considered. The model of slow and nonuniform rotation of the charged DNA domain is used. An equation is obtained for the resonance frequencies of the alternating magnetic field.
Analytical determination of DNA melting characteristic parameters using the optimal degree polynomial regression model
Authors: Belov D A , Bulyanitsa A L , Korneva N A , Aldekeeva A S , Belov Yu V 
Published: December 2021

Abstract
The article describes a new technique for determining two main parameters of DNA melting: the melting temperature Tm
and the temperature melting range ΔT, based on the plotting of an approximating polynomial function for the DNA melting curve. An algorithm is proposed for reducing the melting curve to approximation by the fourth degree polynomial function in accordance with the physical aspect of the DNA melting process. The correctness of the optimal degree choice from the condition of minimizing the value of the Akaike’s information criterion corrected has been confirmed. Analytical expressions for calculating the values of Tm
and ΔT are given oriented to a polynomial function of the fourth degree. Results comparison of applying the proposed and well-known techniques based on the experimental data is performed. The advantages of the new technique are revealed.
Cathodoluminescence of carbon-related defects in hexagonal boron nitride
Authors: Petrov Yu V , Vyvenko O F , Gogina O A , Bolotin K , Kovalchuk S , Watanabe K , Taniguchi T 
Published: December 2021

Abstract
Hexagonal boron nitride is a wide band gap semiconductor exhibiting various luminescence bands in visible and near ultraviolet range, which can be used as single photon source. The luminescence band with zero phonon line at 4.1 eV is commonly ascribed to the carbon impurity introduced during crystal growth. In this paper we provide experimental evidence that carbon-related luminescent centers can be introduced in hBN by local electron irradiation in the chamber of scanning electron microscope at room temperature that can be used as a technique for the nanofabrication of single photon source devices with desired pattern.
Development and synthesis of orthophosphate single crystals of YPO4 and LuP4 activated with Er3+
Authors: Silantieva E A , Zamoryanskaya M V , Burakov B E 
Published: December 2021

Abstract
Crystals of xenotime-structured phosphates doped with erbium had been grown from molybdate flux at a temperature 1220 ° C followed by slow cooling. The crystals synthesized had been studied using X-ray diffraction and electron probe microanalysis in combination with optical microscopy and luminescence studies.
Engineering of defects in fast neutron irradiated synthetic diamonds
Authors: Khomich A A , Kovalev A I , Khmelnitsky R A , Khomich A V , Popovich A F , Ralchenko V G 
Published: December 2021

Abstract
Chemical vapor deposited (CVD) diamonds have been irradiated with fast reactor neutrons at fluencies F = 1·1018 and 3 · 1018 cm-2 and then heated at temperatures up to 1600 °C. The processes of annealing in and annealing out of various complexes of intrinsic defects responsible for vibrational and electron-vibrational bands in the IR absorption spectra have been studied in detail. Some tens of local vibrational modes and zero-phonon lines with rather small width caused by numerous complexes of intrinsic defects were observed in the 400-11000 cm-1 range.
Simulation of heat transfer processes during the growth of crystals of the NiFeGaCo alloy
Authors: Vasil’ev M G , Krymov V M , Nosov Yu G , Bakholdin S I 
Published: December 2021

Abstract
Long crystals of NiFeGaCo alloy with shape memory effect, including magnetically controlled ones, were obtained by the methods of Czochralski and Stepanov. A strong influence on the properties of crystals of dendritic formations, especially noticeable in the initial part of the crystal, has been revealed. In order to optimize the growth experiments, the heat transfer process in the thermal growth zone was simulated. It is shown that the formation of dendrites is due to a change in heat transfer during growth, which leads to an increase in the axial temperature gradient near the crystallization front as the crystal grows. This fits into the framework of the classical concepts of the transition from dendritic growth to normal growth.
Measurements of pyroelectric coefficients of BT and BST ceramics
Authors: Burovikhin A P , Mylnikov I L , Dedyk A I , Belyavskiy P Yu , Pavlova Yu V , Pakhomov O V , Ivanov A A 
Published: December 2021

Abstract
In the work, the field and temperature dependencies on the pyroelectric coefficients of ceramic capacitor structures were measured. Barium titanate (BT) and solid solutions of barium-strontium titanate (BST) were investigate. At temperatures range from 20 °C to 30 °C, the values of the pyroelectric coefficients of the BST ceramics (p) 10-5 - 10-4 C/m2 K exceeded p for the BT ceramics by an order. The developed measurement technique made it possible to carry out direct pyroelectric coefficients measurements and determine the polarization initial state of the samples, regardless of their phase state.
The influence of conformational defects on the development of structural phase transition in tetracosane C24H50
Authors: Gureva S A , Marikhin V A , Myasnikova L P , Volchek B Z , Medvedeva D A 
Published: December 2021

Abstract
The kinetics of the first-order solid-state structural transition in monodisperse n-alkanes samples of even tetracosane C24H50 was studied by FTIR spectroscopy. The existence of many irregular conformers in solid phases of tetracosane, the concentration of which reaches a maximum when approaching the melting temperature, has been demonstrated. The existence of these defective molecules promotes transitions between different rotator phases in the solid state.
The nanostructuring of ultra-high-molecular-weight polyethylene in thermal and mechanical fields as revealed by DSC
Authors: Myasnikova L P , Borisov A K , Boiko Yu M , Borsenko A P , Drobot’ko V F , Egorov V M , Ivankova E M , Radovanova E I , Marikhin V A 
Published: December 2021

Abstract
The ultra-high-molecular-weight polyethylene reactor powders are widely used for the actively developing solvent-free method for producing high-strength high-modulus PE filaments, which includes the compaction and sintering of a powder followed by orientational hardening. To find an appropriate regime of the technological process, it is important to know how the nanostructure changes when transforming from a powder to a precursor for hardening. Nanocrystalline lamellae are characteristics of the powder structure. For the first time, the DSC technique was used to follow changes in the thickness distribution of lamellae in ultra-high-molecular-weight polyethylene reactor powder on its way to a precursor for orientation hardening. It was found that the percentage of thick (>15 nm) and thin (10 nm) lamellae in compacted samples and those sintered at temperatures lower than the melting temperature of PE (140°C) remains nearly the same. However, significant changes in the content of lamellae of different thicknesses were observed in the samples sintered at 145°C with subsequent cooling under different conditions. The influence of the lamellae thickness distribution in precursors on the mechanical characteristics of oriented filaments was discussed.
Investigation of electrolysis-related modification of graphene films in biosensors
Authors: Eliseyev I A , Usikov A S , Lebedev S P , Roenkov A D , Puzyk M V , Makarov Yu M , Gushchina E V , Oganesyan G A , Voronina A A , Shabunina E I , Shmidt N M 
Published: December 2021

Abstract
In this work, the modification of the surface parameters of graphene chips after electrolysis treatment in a NaClO4 aqueous solution has been studied. Two electrolysis modes have been analysed. In the first one, a negative potential (-0.2 V) is applied to the graphene chips, while in the second one the potential is positive (0.8 V). Investigation using a number of techniques including atomic force microscopy, Kelvin probe force microscopy, Raman spectroscopy, measurements of current-voltage characteristics and low-frequency noise has shown that the electrolysis mode with application of a positive potential on graphene chips decreases the 1/f noise and allows one to obtain a uniform surface potential distribution while leaving the graphene structure undamaged. The results of this study help to understand the efficiency and reproducibility of the procedure for electrolysis treatment of graphene chips.
Influence of the magnetic field on the formation and properties of polyvinyl alcohol - multi-walled carbon nanotube nanocomposites
Authors: Vasin S V , Efimov M S , Nizametdinov A M , Sergeev V A 
Published: December 2021

Abstract
The effect of a magnetic field on the polymerization process and the electrophysical characteristics of polyvinyl alcohol (PVA) films with the inclusion of multiwalled carbon nanotubes (MWCNTs) was studied. Using SEM micrographs, it was shown that the films obtained under the action of a magnetic field have a more homogeneous structure, while a significant number of MCNT agglomerations are present in the control samples. In the study of the conductivity at direct and alternating current, it was found that the films obtained in a magnetic field have a conductivity that significantly exceeds the conductivity of the control samples. It has been shown that the use of a magnetic field during polymerization has a noticeable effect on the properties and characteristics of nanocomposite films based on PVA and MWCNTs.
Clustering in thin silver films upon heating
Authors: Kazakov V A , Razina A G , Smirnov A V , Vasilev A I 
Published: December 2021

Abstract
The kinetics of the formation of silver clusters Ag from nanoscale continuous films of Ag on the surface of silicate glass and composite structures from films of Ag with carbon in the form of a continuous film and individual nanoparticles upon annealing in air at temperatures up to 670K is investigated. In the course of the work, the dependences of the surface morphology of silver clusters and absorption spectra in the visible wavelength range were obtained by the methods of atomic force microscopy and optical spectrophotometry.
Construction of barrier heterostructures based on carbon and organometallic compounds
Authors: Mazinov A S , Gurchenko V S , Tyutyunik A S , Ilina V Y , Dmitriev A I 
Published: December 2021

AbstractThis paper presents the results of using hybrid-organic zinc complex C24H24N6O3Zn as a component for creating fullerene C60-based heterostructures. The synthesis technique of the complex compound, the microscopy of the film surfaces obtained, their optical and luminescence properties are described in the paper. The introduction of zinc complex to fullerene shows that there occurs a potential barrier at the active layer interface. The obtained thin-film structures have rectifying light volt-ampere characteristics.
Development of techniques for the formation of a planar electric vacuum diode based on an array of CNTs synthesized at the edge of the Co-Nb-N-(O) film
Authors: Eritsyan G S , Gromov D G , Dubkov S V , Kitsyuk E P , Savitskiy A I , Dudin A A 
Published: December 2021

Abstract
This work shows the possibility of forming a planar diode structure based on carbon nanotubes formed on a catalytic alloy film Co-Nb-N-(O). The paper presents a technological route for the formation of a planar diode structure Si/SiO2/Si3N4/Co-Nb-N-(O)/SiO2 and studies the emission characteristics. The current-voltage characteristic of the obtained diode structure in the Fowler-Nordheim coordinates is close to linear in the range from 15 to 22 V, which confirms the phenomenon of electron emission.
III-V nanostructures with different dimensionality on silicon
Authors: Reznik R R , Kotlyar K P , Gridchin V O , Ilkiv I V , Khrebtov A I , Samsonenko Yu B , Soshnikov I P , Kryzhanovskaya N V , Leandro L , Akopian N , Cirlin G E 
Published: December 2021

Abstract
The possibility of AlGaAs nanowires with GaAs quantum dots and InP nanowires with InAsP quantum dots growth by molecular-beam epitaxy on silicon substrates has been demonstrated. Results of GaAs quantum dots optical properties studies have shown that these objects are sources of single photons. In case of InP nanowires with InAsP quantum dots, the results we obtained indicate that nearly 100% of coherent nanowires can be formed with high optical quality of this system on a silicon surface. The presence of a band with maximum emission intensity near 1.3 μm makes it possible to consider the given system promising for further integration of optical elements on silicon platform with fiber-optic systems. Our work, therefore, opens new prospects for integration of direct bandgap semiconductors and singlephoton sources on silicon platform for various applications in the fields of silicon photonics and quantum information technology.
Plasma enhanced chemical vapor deposition of gallium phosphide at low temperature
Authors: Uvarov A V , Morozov I A , Baranov A I , Maximova A A , Vyacheslavova E A , Kudryashov D A , Gudovskikh A S 
Published: December 2021

Abstract
This article is devoted to the formation and study of the properties of amorphous gallium phosphide layers obtained by plasma-chemical deposition at a temperature of 250 °C. The optical and structural properties of the obtained layers on fused silica and silicon substrates were investigated. The possibility of the formation of a homogeneous amorphous gallium phosphide with a smooth surface at a low temperature and low power of RF plasma was shown.
Influence of plasmon resonance on the luminescence of titanium dioxide thin films doped with rare earth ions
Authors: Łapński M , Czubek J , Drozdowska K , Sadowski W , Kuznetsov V V , Charykov N , Koscielska B 
Published: December 2021

Abstract
In this work the study of the optical properties of europium doped titanium dioxide thin films (TiO2:Eu) enhanced by gold plasmonic nanostructures are presented. Plasmonic platforms were manufactured by thermal annealing of thin film of Au, deposited on a Corning glass substrate. As a result of thermal treatment, gold spherical nanostructures with average dimensions of 50 nm were obtained. Luminescent TiO2:Eu film was deposited by RF magnetron sputtering method, from mosaic target. Morphology of gold nanostructures was investigated by SEM and TEM microscopes, while composition of oxides film was analysed by XPS methods. Luminescence properties were studied on the basis of excitation and emission spectra. Experiments have shown that such structures exhibit interesting luminescent properties and could be potential candidates for optoelectronics applications.
Processes of formation of epitaxial arrays of self-catalytic GaP nanowires on Si (111)
Authors: Fedina S V , Fedorov V V , Berdnikov Yu S , Sapunov G A , Mukhin I S 
Published: December 2021

Abstract
This study is devoted to the investigation of the effect of growth conditions (growth temperature, values of molecular beam fluxes) on the formation of self-catalytic GaP NW on Si(111), namely surface density, orientation and NW morphology. Nanowire arrays were grown on Si (111) by the plasma-assisted molecular beam epitaxy. It was determined that an increase of the temperature and a decrease of the Ga flux, while maintaining the V/III ratio, reduces the inclined NWs and parasitic islands nucleation probability.
Study of electric parameters of thin porous anodic alumina layers
Authors: Muratova E N , Nalimova S S , Bobkov A A , Moshnikov V A 
Published: December 2021

Abstract
Currently, the study of the electric parameters of porous anodic alumina (PAA) layers is of interest for sensor applications (humidity, DNA, etc.). PAA layers are synthesized using electrochemical anodizing of aluminum foil in potentiostatic mode with an aqueous solution of sulfuric acid and glycerin as an electrolyte. The surface morphology of the layers was studied by atomic force microscopy. The electric characteristics were studied using impedance spectroscopy at room temperature and under heating. An increase in the impedance of the heat-treated PAA sample was found, as well as an increase in the impedance with an increase in the measurement temperature. The results are explained by the influence of adsorbed water molecules on the electric characteristics of porous layers.
Model calculations of φ-meson production in small collision systems
Authors: Mitrankova M M , Berdnikov A Ya , Berdnikov Ya A , Kotov D O , Mitrankov Iu M 
Published: December 2021

Abstract
Ultrarelativistic ion collisions provide the unique possibility to study the quark-gluon plasma, a state of matter formed in the universe at the very first moments after the Big Bang. The minimal temperature and baryon density for the quark-gluon plasma formation requires scrutiny, since the signatures of the quark-gluon plasma formation are observed in large systems (such as Au+Au) at

s

N
N

=
200

GeV

, whereas collective effects in p+p collisions are not revealed. The φ-meson production measurements are considered to be a convenient tool to investigate the collision dynamics, as it is sensitive to the quark-gluon plasma effects. To interpret the nuclear modification effects and to study the process of the possible QGP formation the comparison with different theoretical models predictions is needed. This paper presents the comparison of the obtained experimental results on φ-meson production in small collision systems (p+Al, p+Au) at

s

N
N

=
200

GeV

to default and string melting versions of the AMPT model and PYTHIA model predictions. The results indicate that the minimal conditions (temperature and baryon density) for a QGP formation may lie in between in p+Al and p+Au collisions.
Method and stabilization system of position-sensitive spectrometer based on semiconductor strip detector
Authors: Tuboltsev Yu V , Eremin I V , Bogdanov A A , Chichagov Yu V , Eremin V K , Verbitskaya E M 
Published: December 2021

Abstract
The paper proposes a method and its realization for stabilizing the characteristics of a multichannel position-sensitive spectrometer. The device uses a new design of the semiconductor strip detector, which allows a simultaneous injection of stable in time electric charges on all strips. This solution enables the electronics to track changes in the conversion characteristics of all electronic channels including detectors strips, and correct them during the spectrometer operation. In addition, the proposed detector design makes it possible to control the signal propagation along the strips, thus providing an on-line check of the integrity of strips metallization and the quality of their connection with the readout electronics.