bluuebunny/crossref_metadata_2025_split huggingface dataset:
The structure of multi-walled carbon nanotubes as a factor affecting the life of E. Coli
Authors: Popov A P , Dimitrieva A I , Kovalenko A V , Yumanov D S , Stepanov A V , Shemukhin A A , Vorobyeva E A , Elsehly Emad M 
Published: August 2020

Abstract
In this work, we investigated the relationship between the structural properties of materials based on multi-walled carbon nanotubes and the vital activity of bacteria E. Coli strain M-17. In the course of research using scanning electron microscopy and Raman spectroscopy, the structure of nanotubes was analyzed. Nanotube samples were tested for wettability. The effect of carbon nanotube samples on the growth of the bacterial culture of E. Coli strain M-17 using spectrophotometry was investigated. As a result, it was shown that samples containing more disordered defective nanotubes on the surface are more hydrophilic and also show worse biocompatibility properties for E. Coli bacteria.
The synthesis of Fe-Ag and Fe-Cu bimetallic nanoparticles by electrical explosion of wires
Authors: Chjou V R , Varnakova E A , Bakina O V , Naumova L B 
Published: August 2020

Abstract
In the present study, we obtained antibacterial Fe-Cu and Fe-Ag bimetallic nanoparticles by electrical explosion of two twisted wires. This method allows obtaining nanoparticles of a given composition and morphology. As-synthesized nanoparticles were characterized by electron microscopy, X-ray diffraction, micro electrophoresis techniques and magnet technique. In result we observed the formation of nanoparticles with Janus-like structure with distinct separation of components inside the particle. These nanoparticles have a strong antibacterial activity against two bacteria strains. The high antimicrobial activity of the nanoparticles is due to the prolonged ion release in media. Taking into account the possibility of easy magnetic separation of the novel bimetallic demonstrate the potential for their use as promising new generation antibacterial agents for advanced antimicrobial water treatment technologies.
The influence of the energy density of the electron beam on the morphology of surface and mechanical properties of the surface layer of NiTi alloy
Authors: D’yachenko F A , Atovullaeva A A , Meisner L L 
Published: August 2020

Abstract
This work comprises a study of the influence of the energy density E

s
of the low-energy high-current electron beam (LEHCEB) exposure on the morphology of surface and mechanical properties of the surface layer of nickel titanium alloy (NiTi alloy). It was found that the formation of crater-like relief on the surface of NiTi alloy after electron beam treatment is determined by the structure and distribution of the particles of second and impurity phases. The mechanical properties in a modified surface layer of no more than ∼ 500 nm thickness change at different values of the energy density E

s
of electron beam.
Beam-produced plasma generated by the pulsed large-radius electron beam in the forevacuum pressure range
Authors: Kazakov A V , Medovnik A V , Oks E M , Panchenko N A 
Published: August 2020

Abstract
The research of plasma produced by a pulsed low-energy large-radius electron beam generated by the plasma-cathode electron source in the forevacuum pressure range 4-13 Pa is presented. The beam-produced plasma has been generated in nitrogen by the electron beam with energy of 8 keV and pulse duration of 1.5 ms. The emission spectrum analysis and probe measurements have been used to investigate plasma parameters. Density of beam-produced plasma increases linearly with increasing electron beam current. The probe measurements have demonstrated almost linear dependence of plasma density on gas pressure in the pressure range 4-13 Pa, while intensities of spectral lines came from exited plasma ions are linear dependent on beam current only in pressure range 6-13 Pa. These spectral lines have low intensities at gas pressure below 6 Pa.
Maximal current of a pulsed constricted arc discharge operating in the forevacuum plasma electron source
Authors: Kazakov A V , Medovnik A V , Oks E M , Panchenko N A 
Published: August 2020

Abstract
The paper presents results of investigation of maximal current of the pulsed constricted arc discharge generating emission plasma in the forevacuum plasma electron source. Distinctive feature of the forevacuum plasma electron source is the absence of pressure differential between region of formation of emission plasma and the region of acceleration and propagation of electron beam. Therefore, the operating conditions of the constricted arc in the forevacuum plasma source are significantly different from the conditions in the plasma electron sources generating electron beams at pressure 10–3–10–1 Pa. The constriction of the positive column of the arc discharge provides, as it known, to reduce influence of instability and chaotic behavior of the cathode spot of the arc on the formation of emission plasma. In the investigated pressure range 3–20.5 Pa, the maximal current of the constricted arc discharge has been limited either by extinction of the arc or by initiation of the cathode spots on the constricting electrode and transition of the arc operation to the cascade mode. Increase of gas pressure and the use of working gas with larger ionization cross section (e.g. argon) have provided increase of the maximal arc current. The increase in the constricting channel diameter has provided the increase of maximal current and provided lower minimal gas pressure, at which stable operation of the constricted arc ensured. The decrease of length of the constricting channel has provided noticeable increase in the maximal arc current only at gas pressure more than 12 Pa.
Separation of ammonium fluorometallates during hydrometallurgical processing of titanomagnetite ore
Authors: Sachkov V I , Nefedov R A , Amelichkin I V , Orlov V V , Medvedev R O 
Published: August 2020

Abstract
In this work, we used the hydrometallurgical method for processing titanomagnetite ore with an aqueous solution containing ammonium fluoride and hydrofluoric acid, with the aim of obtaining and subsequent separation of the resulting reaction products. Separation of compounds was carried out by precipitation of ammonium fluorometallates with an ammonia solution. The results of product separation by changing pH are presented. At pH 8, silicon ((NH4)2SiF6 – 55 % wt) and iron ((NH4)0.75Fe3F9 – 11 % wt and (NH4)2FeF5 – 6 % wt) compounds are mostly precipitated. At pH 9, the precipitate consists of titanium compounds: (NH4)2TiF4O – 67 % wt and NH4TiOF3 – 33 % wt.
A voltammetric sensor for simultaneous determination of tryptophan and 5-hydroxytryptophan
Authors: Altyev A M , Shelkovnikov V V , Fryanova M S 
Published: August 2020

Abstract
The present work proposes a method for simultaneous determination of tryptophan and 5-hydroxytryptophan on the carbon-bearing electrode modified with multiwall carbon nanotubes and polyfolic acid. Analytical signals are conditioned by oxidation of tryptophan and 5–hydroxytryptophan from the complex containing polyfolic acid. Preparation of the electrode consists in the formation of the B9 vitamin film on the surface of the carbon-bearing electrode, modified with multiwall carbon nanotubes by the method of cyclic voltammetry. The detection limit of tryptophan and 5-hydroxytryptophan is 1 × 10–7 M.
Physical Modeling of Oil Displacement in the Multifunctional Surfactant-based Chemical Composition
Authors: Kozlov V V , Altunina L K , Chernova U V , Sholidodov M R 
Published: August 2020

AbstractThe paper presents the test results of a new multifunctional chemical composition based on surfactants in the process of displacement of heavy high-viscosity oil. Physical modeling of the oil displacement process was carried out in a laboratory setup which allows modeling heterogeneity of the oil-saturated formation. As a result of experiments it was found that the use of a multifunctional chemical oil-displacing composition based on a surfactant leads not only to a change in the filtration flows within the heterogeneous reservoir model but also to an increase in the oil displacement coefficient.
Influence of size of metal-ceramic composites on their electron-beam sintering in the forevacuum pressure range
Authors: Klimov A S , Yu Bakeev I , Tran V T , Zenin A A 
Published: August 2020

Abstract
Ceramic-metal composite materials combine high strength of ceramic and plasticity of metal. The combination of these properties allows the use of cermet in many industries and medicine. Cermet materials are made using powder technology by sintering a compact consisting of a mixture of pressed powders. The properties of the resulting product are determined by both the initial component composition and the sintering method. In the present work, electron beam sintering in the fore-vacuum pressure range was used to obtain cermet. The feature of this method is the possibility of flexible control of the sintering process by changing the parameters of the electron beam. To heat compacts consisting of pressed powders of alumina ceramics and titanium, the surface of compacts was scanned with an electron beam with the diameter of less than 1 mm and the power of 500 W. The surface temperature of the compact during sintering was 1600 °C, and the time of isothermal exposure was 10 minutes. It has been shown that compact thickness has a significant effect on obtaining homogeneous sintered material. Samples with a microhardness of 27 GPa were obtained. The ways of further improving the technology of electron beam sintering of cermet are determined.
Synthesis and application of cobalt and polyoxomolybdate-containing alumina systems
Authors: Akimov A S , Sviridenko N N , Akimov Al S 
Published: August 2020

Abstract
The work is devoted to the synthesis and study of the activity of cobalt and polyoxomolybdate-containing alumina catalyst. The synthesized catalytic system was characterized using the following analysis methods: scanning electron microscopy, x-ray phase analysis, x-ray diffraction analysis, IR spectroscopy. It was found that the CoMo/Al2O3 system is active in the hydrodesulfurization reaction of model raw materials.
Mathematical modeling of helium atom motion inside the fullerene C60 molecule
Authors: Tarasov E A 
Published: August 2020

Abstract
In this research, author modeled numerically the process of motion of a helium atom with different velocities inside the C60 fullerene sphere. The approaches of classical mechanics and the formalism of the intermolecular interaction potential (Lennard-Jones potential) were used to create physical and mathematical models. The transverse dimensions of the area inside the fullerene molecule in which the selected particle (helium atom) moves was obtained.
Evaluating the influence of the magnetic permeability of the microstrip modal filter substrate on its frequency characteristics
Authors: Chernikova E B , Kvasnikov A A , Zabolotsky A M , Kuksenko S P 
Published: August 2020

Abstract
This paper considers the possibility of improving the characteristics of modal filters by using composite materials with a relative magnetic permeability of μ
r
>1. The influence of the magnetic permeability of the microstrip modal filter substrate on its frequency characteristics is investigated. The paper presents the frequency dependences |S
21| of the filter with lengths l=1, 0.5, and 0.2 m and with μ
r
= 1, 4, 7, and 10. It is shown that the increase of the the μ
r
value leads to a decrease in the filter bandwidth.
Enhanced Oil Recovery for Deposits of High Viscosity Oils Using Multifunctional Systems Based on Surfactants
Authors: Altunina L K , Kuvshinov V A , Stasieva L A , Kuvshinov I V 
Published: August 2020

Abstract
To enhance the oil recovery of high-viscosity oil deposits in the temperature range of 20-210 °C, the multifunctional composition based on surfactants, aluminum and ammonium salts, an adduct of inorganic acid, carbamide and polyol with an adjustable viscosity and high oil-displacing ability was created. The composition has a low interfacial tension, a high buffer capacity in a wide pH range, 2.5-10 units pH, a delayed reaction with carbonate rocks, prevents the precipitation of insoluble reaction products, increases the permeability of reservoirs. The composition is both oil-displacing and flow-diverting, provides an enhance in the oil recovery factor (ORF) due to the increase in the oil displacement and formation sweep by water or steam flooding. Practical recommendations are given on the application of the composition at the Permian-Carboniferous deposits of the Usinsk oilfield.
W-rich mixed oxide solid solutions under pressure
Authors: Petrushina M Yu , Dedova E.S. , Yusenko K V , Portnyagin A S , Papynov E K , Filatov E Yu , Korenev S V , Gubanov A I 
Published: August 2020

Abstract
We report high-pressure synchrotron X-ray powder diffraction data for the W-rich cubic ZrW2-xMoxO8 (x=0.4) up to 10 GPa with open decompression. This study shows that cubic- ZrW1.6Mo0.4O8 transforms to orthorhombic phase at the 5.04 GPa. Pressure-induced reversable amorphization of material was observed at 8.13 GPa. The obtained data suggest that W-rich cubic ZrW2-xMoxO8 (x=0.4) solid solutions are more attractive for creating products working under extreme conditions and mechanic stress.
Kinetics of thermal destruction of highly porous anion-exchange resin TOKEM-320Y
Authors: Kuznetsova S A , Khalipova O S , Lisitsa K V , Ditts A A , Malchik A G , Kozik V V 
Published: August 2020

Abstract
Temperature characteristics, stages and thermal effects of the processes occurring during the thermolysis of TOKEM-320Y anion-exchange resin in an atmosphere of air were determined by differential thermal analysis. The activation energies and the orders of reactions of thermal decomposition of the resin were calculated by the Kissinger and Metzger-Horowitz methods using the TG curves obtained at different heating rates of the resin. Models are proposed that most accurately describe the decomposition of TOKEM-320Y in air in the temperature range 25–800 °C.
On fine particles synthesis using three-zone reactor
Authors: Markov A A 
Published: August 2020

Abstract
This paper reports a numerical study on thermal and mass dispersion in carbon combustion synthesis of oxides (CCSO) in porous media. A volume averaging of the microscopic conservation equations over an elementary volume is applied to derive the macroscopic conservation equations for convective and conductive heat and mass transfer in a porous media consisting of gas components mixture and solid particles of reactant species. The governing system of macroequations is the conservation of momentum, mass and energy for multicomponent gas-solid media using the heat and mass exchange between gas and solid phases. The model developed in dimensionless variables and similarity parameters is applied to numerical simulation of barium titanate micron particles synthesis in three-zone reactor using the thermal and mass dispersion. The results are in satisfactory agreement with experimental measurements. The dispersion strongly influences on the thermal front propagation as well as on the barium titanate synthesis rate. The three-zone reactor is more efficient compared to the flow-reactor.
Sorption activity of polyhexamethylene guanidine hydrochloride hydrogels towards extracts of medicinal plants
Authors: Ochirov O S , Olennikov D N , Turtueva T A , Grigor’eva M N , Stelmakh S A , Mognonov D M 
Published: August 2020

Abstract
The study aims to obtain polyhexamethylene guanidine hydrochloride hydrogel compositions with extracts of medicinal plants growing in the Baikal region (Bergenia crassifolia, Calendula officinalis, Tussilago farfara) to evaluate sorption activity and consider the subsequent use of the compositions as an external wound healing agent. It has been shown that hydrogel sorbs mainly caffeinequinic acids in various compositions. It has been made an assumption about a link of sorption process with formation of secondary amino groups’ complex in the hexahydrotriazine cycle, which is formed as a result of gelation of PHMGhch, and carboxyl groups of extract substances. It is planned to study the wound healing activity of compositions by modeling skin damage of laboratory animals in future researches.
Composite fluoropolymer piezoelectric membranes for reconstructive surgery
Authors: Tverdokhlebova T T , Bolbasov E N , Khanova M Yu , Antonova L V , Buznik V M 
Published: August 2020

Abstract
The work represents the results of researchers on the formation of composite fluoropolymer piezoelectric membranes based on a copolymer of vinylidene fluoride with tetrafluoroethylene (VDF-TeFE) and polyethylpyrrolidone (PVP) by the electrospinning method. The effect of the PVP content on the structure of the formed membranes was measured using scanning electron microscopy. The biocompatibility of the obtained membranes was studied by fluorescence microscopy on a model of human skin fibroblasts. The studied samples with a 0, 5 and 15% PVP content have good adhesive characteristics, preserve the viability and potential of cells to divide and therefore are most suitable for further use in regenerative medicine.
Express method for analyzing the efficiency of endodontic files in dentistry
Authors: Avilov A V , Avilova N V , Tsybri I K 
Published: August 2020

Abstract
When treating root canals of teeth, deformations occur, changes in the geometric characteristics of the surface of endodontic files, which causes their breakages and problems when removing fragments of files from the root canals of the tooth. The article offers a method of express analysis of the preliminary assessment of the serviceable state of the endodontic file to exclude its damage in the root canal of the tooth. The method consists in studying the amplitude-frequency characteristics of endodontic files (natural frequencies) using the software of modern smartphones and sound spectrum analyzers for smartphones with the Android operating system. Research results are presented. It is proved that the natural oscillation frequency of new endodontic files ranges from 1260-1280 Hz, and the natural oscillation frequency of deformed endodontic files increases to 1520-1560 Hz or more.
Development and in Vivo Evaluation of a Biodegradable Vascular Graft Reinforced with a Fused PCL Filament
Authors: Krivkina E O , Klyshnikov K Y , Rezvova M A , Sevostyanova V V , Tkachenko V O , Glyshkova T V , Mironov A V , Antonova L V 
Published: August 2020

AbstractTissue-engineered vascular grafts developed for cardiovascular surgery must be fully functional after implantation, resistant to all types of kinks, compression and burst pressure. One of the approaches to improve mechanical properties includes the reinforcement with an outer polymeric sheath. This study was aimed at evaluating the mechanical properties of a tissue-engineered vascular graft reinforced with a fused PCL filament and in vivo testing in a carotid artery of sheep within one year.
Kidney stones analysis by ICP-OES
Authors: Tsygankova A , Lundovskaya O , Aleksandrova A , Korolkov I , Filatov E , Pechkovsky E , Yarin G , Safonov D , Vilgelmi I , Glushkova N , Gubanov A. 
Published: August 2020

Abstract
The elemental composition of 100 oxalate type (only whewellite, weddellite and their mixture) urinary stones was determined by ICP OES. The calcium content varies from 130 to 320 g/kg; phosphorus – from 1.6 to 28 g/kg; sodium – from 0.54 to 8.7 g/kg; Ba, Fe, K, Li, Mg, Sr and Zn – from 0.0002 to 2.0 g/kg. The correlation analysis (Spearman rank correlation) showed a very weak tightness of the relationship between the elements of Ca/Li; a weak bond tightness for the pairs of elements Ba/Ca, Ba/Mg, Ba/Sr; Ca/Fe, Ca/Na, Ca/Sr; Fe/Mg, Fe/P, Fe/Sr, Fe/Zn; Li/Mg; Mg/Sr, Mg/Zn; P/Zn; average bond tightness for pairs of elements Ca/Mg, K/Na, Mg/P. All these correlations are positive.
Creation of applied intelligent system for diagnostics of cognitive and emotional-volitional sphere of post-stroke patients at different stages of rehabilitation treatment
Authors: Yankovskaya A , Obukhovskaya V , Nazmetdinova D 
Published: August 2020

Abstract
In this paper, we describe the creation of the medical diagnostic intelligent system, which is used for the analysis of cognitive and emotional-volitional sphere of post-stroke patients at different stages of rehabilitation treatment (IS DICEV). The applied IS DICEV is constructed with the help of intelligent instrumental software IMSLOG and is based on test methods of the pattern recognition, fault-tolerant mixed diagnostic tests. The use of the applied IS DICEV will allow revealing various kinds of regularities in the cognitive and emotional-volitional sphere of post-stroke patients, as well as finding diagnostic decisions and justifying those using graphical tools. These goals are very important for tracking the dynamics of rehabilitation treatment.
Mathematical and information support of the program complex for planning of the harvesting of wild-growing products
Authors: Ivanyo Ya , Petrova S , Polkovskaya M 
Published: August 2020

Abstract
The paper presents the results of the development of information and software for a program complex of modeling the harvesting of wild-growing food resources. Linear programming models with interval parameters are proposed to optimize the harvesting of wild-growing food resources. In addition to models with interval parameters, a model of stochastic programming is developed under the condition of stationary state of the yield series of wild-growing crops. Models may contain dependent and independent coefficients for unknowns. The database includes information on the yield of wild crops, labor resources, product prices, questionnaire data filled in by procurement staff, results of field studies on a preliminary assessment of possible harvest, maps showing the territories of commercial resources for each species. The developed software package can be used to simulate the harvesting of wild food resources in any regions with commercial reserves of wild plants. The development results were tested for some municipal districts of the Irkutsk region and model clusters.
Analysis of Statistical Methods on Plurilinguistic Quantitative Data
Authors: Krasnopeeva T , Gromov M 
Published: August 2020

Abstract
This multidisciplinary study deals with a population cluster of migrant multilinguals as a complex phenomenon of Social Physics with the help of the mathematical-statistical tools. It enlightens two statistical methods used to analyse the quantitative data on the plurilingual competence of the university students: the Rasch analysis and the T-test. These methods are able to give a more profound picture of the individual migrants’ plurilingual ability in terms of migration as a sociophysical phenomenon. We consider the strengths that each method has as the physical values in order to understand the linguistic behavior of migrant flow as a complex matter and each migrant student as a part of this flow. Our multidisciplinary study empirically investigates whether the positive impact of the statistical methods is relevant by using recent dataset on the example of the multilinguals’ social cluster. The main conclusion of the study shows the positive impact of the Rasch model in measurement of complex sociophysical matters with respect to the ability of a migrant social cluster to the plurilingualism, and results in the statement that this tool is capable to decipher the empirical data in a qualitative manner, in particular, for its application to the group educational trajectories. However, T-test showed the statistical insignificance of the current data set if this data set is used to predict further development of plurilingual competence.