bluuebunny/crossref_metadata_2025_split huggingface dataset:
Classification of Urban Focal Points Based on Cluster Analysis
Authors: Zedgenizov Anton , Strizhakov Evgenii 
Published: November 2019

Abstract
The article presents cluster analysis algorithms used to assess traffic demand and to define the urban territories (focal points (FPs)) as separate clusters (groups) allowing proving/disproving the necessity of territories (FPs) merging on the basis of stated indicators with mathematical precision. The relevance of developing the classification of urban FPs within the context of basic parameters of their functioning is defined. The uniqueness boundary of FP is determined which is used as the base of classifying FPs. The cluster analysis is discussed, namely, its advantages and disadvantages. The goal of the cluster analysis is stated as applied to traffic demand assessment. The cluster analysis is applied to each of 6 enlarged types of territories (FPs): warehousing and utilities; industry; offices; education, healthcare, sport, culture, leisure; trading, public catering, service sector; housing sector.
Quality of Modern Learning Environment and Health-Saving Discourses
Authors: Zheleznyak Olga , Korelina Mirya 
Published: November 2019

Abstract
This paper dwells upon the environmental health as the key feature of a “quality city” that must be prioritized by any educational institution in its development. The research identifies the factors of creating a health-saving environment as well as the specifics of creating learning space at a school. Emphasis is made on designing comfortable space of high aesthetic value, preserving a health-saving environment, implementing ecological resources and natural motifs, creating a unique environment and a positive image, as well as making unique artistic designs psychologically safer. It is important that designs make use of salutogenesis. The presented designs focus on modernizing the learning environment in Irkutsk to improve its quality, to make it help preserve and boost students’ and teachers’ health. Special emphasis is made on the importance of creative environment and nature-aligned lifestyles.
Environmental and economic performance assessment of elemental sulfur recovery unit installation project
Authors: Rybinskaya Elena , Rybinskiy Alexander , Bergen Darya 
Published: November 2019

Abstract
The problem of air pollution is one of the global problems of mankind at the present time. The Irkutsk region has been one of the “leaders” in Russia with the highest excess in air concentrations of maximum permissible concentrations of pollutants during the past decades. The current situation has a very negative impact on the environmental well-being of both adults and children. In the conditions of the prevailing realities, an immediate modernization of production is required, aimed at eliminating or reducing such a prolonged negative impact. The construction and installation of a sulfur recovery unit at oil refineries complies with the latest environmental protection requirements and contributes to a significant reduction in emissions of hydrogen sulfide and sulfur dioxide. The environmental and economic feasibility of such production modernization is illustrated by the example of the Angarsk Petrochemical Company JSC.
Influence of Al Content on Micro-Properties of TiAlSiN Coatings Deposited by Plasma Enhanced Magnetron Sputtering
Authors: Wang Yulong , Zhang Hao , Luo Chengang , Ran Xiaoyu , Ren Zhangpeng , Duo Shuwang 
Published: November 2019

Abstract
TiN coating has attracted substantial attention due to its high hardness and good wear resistance. To meet the current more demanding service environment, Al and Si were added to TiN coating to further improve its comprehensive performance in this work. TiAlSiN coatings with different Al content governed by Al target power were prepared on GH169 superalloy by plasma enhanced magnetron sputtering, and the Al content effects on microstructure and mechanical properties of the coatings were explored in detail. The crystal structure, chemical composition, micromorphology and surface roughness of the coatings were analyzed by XRD, SEM, EDS and AFM, respectively. The mechanical properties of the coatings at room temperature including micro-hardness, elastic modulus and bonding strength were evaluated by nano-indentation and nano-scratch, respectively. With the increase of Al target power, Al content in coatings increased, and the preferred orientation of TiN(111) plane was also more and more obvious. At the same time, the surface morphology of the coatings changed from the round cell shape to the hexagonal star shape. The hardness, elastic modulus and adhesion of the coatings increased first and then decreased with the Al content. The TiAlSiN coating with Al content of 19.25% possesses the best comprehensive properties.
Influences of Melamine Flow Rate on the Growth Behavior of Nanocrystalline Diamond Films by Direct Current Plasma Chemical Vapor Deposition Method
Authors: Wu Chunlei , Liu Yanfeng , Hao Guodong , Zhu Ruihua 
Published: November 2019

Abstract
InCH4/H2 atmosphere, Nitrogen-doped nanocrystalline diamond films were prepared by direct current hot-cathode plasma chemical vapor deposition (PCVD) method on the conditions of different flow rate of Melamine. While the flow rate of Melamine is 2sccm, the grain refining effect on the diamond films is obvious and the nanocrystalline grains protrude from the basis of the film which shape rough surfaces. The films are incompact, due to its large gaps and holes as well as defects, however the conductivity of these films are increased. The increasing flow rate of Melamine promotes the growth of (111) oriented.
An experimental study on the influence of functionalized carbon nanotubes CNT Taunit series on the thermal conductivity enhancement
Authors: Ali A J , Tugolukov E N 
Published: November 2019

Abstract
This paper aims to determine the thermal conductivity for two types of functionalized carbon nanotubes (FCNT “Taunit M”) nanofluids. FCNT1 and FCNT2 have been used to enhance the thermal conductivity of nanofluids. Six concentrations of 0.01, 0.02, 0.03, 0.05, 0.07, 0.1 wt.% loading of FCNT1 and three concentrations of 0.01, 0.05, 0.1 wt.% loading of FCNT2 have been used in this experiment. The experiments were achieved at temperatures 40°C. The technique for measuring thermal conductivity was described and manufactured at Tambov State Technical University. As a result of the study, the effect of increasing concentrations of FCNTs in the aqueous medium on thermal conductivity was presented. The relationship was nonlinear in FCNT1. The maximum enhancement thermal conductivity was 11.6 and 7.1% loading FCNT1 and FCNT2 respectively, which achieved at a weight fraction of 0.05 and 0.1 % respectively. Finally, the latest researches in this field were presented for comparison in the results obtained.
Electrodeposition of MWCNTs/silver composite coatings with enhanced mechanical characteristic
Authors: Litovka Y , Dyakov I , Stolyarov R , Kulakov V , Zhigachev A , Korenkov V 
Published: November 2019

Abstract
The paper describes the technology for producing silver electrochemical coatings containing multi-walled carbon nanotubes (MWCNTs). The MWCNT effect on the roughness, structure and tribological properties of silver coatings obtained with the addition of the nanotubes to an electrolyte in the low concentration range (0 to 80 mg/L). An increase in the microhardness and a decrease in the coefficient of friction were found for the modified coatings at the MWCNTs concentrations in the electrolyte of 40 and 60 mg/L, respectively.
Method of manufacturing of composite for 3D printing and the electrophysical properties of the obtained material
Authors: Dorozhkin K , Tkachev A , Kuleshov G , Badin A , Galunin E , Shematilo T , Suslyaev V 
Published: November 2019

Abstract
The present paper presents the technology for the manufacture of filaments based on ABS plastic and Taunit-M nanomaterial for use in 3D printing. A test sample was printed from this filament on a 3D printer using the layered overlap method at 15% Taunit-M content. The transmittance spectra for the printed sample were obtained using a Mach-Zander interferometer in the frequency range 120-260 GHz. The complex dielectric constant of the studied composite was calculated.
A nanostructuring approach for modification of the features of optical materials: lithium fluoride
Authors: Kamanina N , Kuzhakov P , Kukharchik A , Kvashnin D 
Published: November 2019

AbstractIt is well known that different technical methods and physical-chemical approaches can be used to improve the basic properties of optical materials operated in the UV-VIS-IR spectral range. Laser-based equipment and a nanotechnology approach can be jointly applied with good advantage. In this paper, the advantage of the laser-oriented deposition technique is discussed. Promising nanoobjects based on carbon nanotubes and LiF structures were considered, and their spectral, mechanical and wetting properties were evaluated. It was found the modification of the LiF with the carbon nanotubes improves the optical properties of the former. The quantum chemical simulations confirmed the experimental results obtained. Besides, the changes in the properties of the other classical materials (such as KCl, KBr, MgF2,etc) were comparatively shown.
Fuzzy logical-linguistic model for assessing the qualitative composition of carbon nanomaterials
Authors: Popov A , Polyakov D 
Published: November 2019

Abstract
The paper considers the development of methodological approaches to assessing the qualitative composition of carbon nanomaterials (nanotubes) and predicting their behavior in processes based on the theory of fuzzy sets. The state of the nanotechnology industry is analyzed, and the problematic moments of its development are highlighted. The necessity of proposing new approaches to evaluate nanomaterials due to the specificity of their properties is substantiated. The trends in the industrial use of carbon-based nanomaterials are identified, and the importance of their rational application based on an objective description of the qualitative composition of carbon nanomaterials for the development of the nanotechnology industry is shown. In this regard, it is proposed to use the mathematical apparatus of the theory of fuzzy sets, linguistic variables, and corresponding mathematical methods considering expert opinions and experimental results. A mathematical model created allows to predict the behavior of the nanotubes in various processes and solve the problem of the latters’ optimization.
Improved microhardness of chrome galvanic coatings with combining nanodiamonds and nanotubes
Authors: Litovka Yu , Nasraoui M , Dolmatov V 
Published: November 2019

Abstract
The method is developed for obtaining nanomodified galvanic coatings by adding a mixture of nanomaterials to the electrolyte. An experimental study of the microhardness of the precipitate of the technological process of obtaining nanomodified by a combination of nanodiamonds and multilayer carbon nanotubes; by a combination of single-layer carbon nanotubes and multilayer carbon nanotubes of chromium galvanic coating from a standard electrolyte was carried out. When nanodiamonds 12 g/l and multilayer carbon nanotubes “Taunit” 80 mg/l are added to the electrolyte, the microhardness of the chromium coating increases by 27% compared to the chromium coating obtained from the standard chromium plating electrolyte without additives. When single-layer carbon nanotubes 50 mg/l and multilayer carbon nanotubes “Taunit” 80 mg/l are added to the electrolyte, the microhardness of the chromium coating increases by 22% compared to the chromium coating obtained from the standard chromium plating electrolyte without additives. The service life of the parts, the chrome coating on which is obtained from the electrolyte with a mixture of nanodiamonds and multilayer carbon nanotubes “Taunit”, single-layer carbon nanotubes and multilayer carbon nanotubes is significantly higher than when using a traditional chrome coating, as well as using multilayer carbon nanotubes, single-layer carbon nanotubes or nanodiamonds separately.
Conductivity of a carbon nanotubes-epoxy resin nanocomposite
Authors: Blokhin A , Zaytsev I , Sukhorukov A , Stolyarov R , Popov A , Burmistrov I , Kobzev D , Yagubov V 
Published: November 2019

Abstract
Multi-walled carbon nanotubes (CNTs) were used to reduce the electrical resistivity (i.e., increase the conductivity) of industrial epoxy. Samples loaded with 6 wt.% CNTs showed a 9-fold increase in the conductivity. The starting epoxy resin is dielectric. The electrical resistivity data showed a percolation threshold between 0.5 and 2 wt.% CNTs loading. The temperature coefficient of electrical resistivity of the samples containing 2 wt.% in the temperature range from 20 to 60°C was 11.5·10-3 K-1. These results suggested that the conductivity of the CNTs-epoxy composites is improved, without any need for chemical functionalization of the nanotubes.
Physical-chemical properties and catalytic activity of the Ni-Co-CB material
Authors: Andrienko O , Kobotaeva N , Skorokhodova T , Marakina E , Sachkov V 
Published: November 2019

Abstract
Carbon materials are widely used in catalysis as a support for active catalyst components due to their chemical inertness and developed surface. The most common carbon carriers are represented by activated carbons, carbon black and various carbon-carbon composites. In petrochemistry, carbon materials are also employed as catalysts to oxidize sulfur compounds contained in heavy fractions of oil being refined. In this regard, the present paper discusses the issues of metal-carbon composite material manufacturing. Technical carbon, or carbon black (CB), was used as a carbon support, the surface of which was modified with nickel and cobalt. The resulting composite material, Ni-Co-CB, has a high specific surface area comparable to that of the pristine carbon material, thereby favoring its catalytic activity. The high catalytic activity of the composite material developed was observed during oxidative desulfurization of heavy oil feedstock. Hence, the degree of sulfur removal for fuel oil was found to be 82.7 %, whereas for oil it reached 70.7 %.
The method and the device for measuring thermophysical properties of liquids
Authors: Divin A , Ponomarev S , Petrasheva M , Lyubimova D , Mozgova G , Belyaev P , Shishkina G 
Published: November 2019

Abstract
This paper describes the new method and the device for measuring the effective thermophysical characteristics of the investigated fluid under shear flow conditions at a fixed shear rate in the gap between coaxial cylinders. The shear flow is provided by the rotation of the outer cylinder while the inner cylinder remains stationary. The measuring unit can measure the complex rheological and thermophysical characteristics of liquids in less than 30 minutes. This article describes a two-step measurement method. The first step involves the measurement of the excess temperature established because of the heat source action due to the viscous friction in shear flow of the test liquid in a layer between the cylinders; the function of the dissipative heat source in the fluid at this stage is based on the power-law. The second step includes the thermal effect on the liquid layer from the heat source (electric heater) in the inner cylinder and the registration of the temperature response in the inner cylinder layer near the heater. The experimental determination results of polyoxyethylene solution thermophysical characteristics with the addition of nanocarbon material “Taunit” are presented here.
Production of few-layer and multilayer graphene by shearing exfoliation of graphite in liquids
Authors: Pershin V F , Krasnyanskiy M N , Alhilo Z A A , Al-Mashhadani A M R , Baranov A A , Osipov A A 
Published: November 2019

Abstract
The article describes the process of liquid-phase shear exfoliation of graphite in a rotary apparatus with moving blades, in water and I-20A oil (Rosneft, Russia) used as a liquid. The linear dependence of the process intensity on the shear rate and graphite concentration in the initial suspension are established in the paper. To increase the share of graphene converted into graphene plates, it has been proposed to reduce periodically the concentration of graphene plates in suspension by adding pure liquid. It was found that the exfoliation rate of graphite is directly proportional to the concentration of graphite in the initial suspension and the rotor speed. The resulting graphene-containing oil-based suspension was used to modify greases.
Development of thermo-electrochemical cells based on flexible nanocomposite electrodes with oxidized multi-walled carbon nanotubes coating
Authors: Shpekina V , Burmistrov I , Gorshkov N , Artyukhov D , Kiselev N , Kovyneva N , Smirnova Y 
Published: November 2019

Abstract
While conversion of low-grade waste heat into electricity is an important energy harvesting strategy, the thermo-electrochemical cells are one of the most promising devices for this application. This paper shows the study on thermo-electrochemical cell with polymer electrodes coated by oxidized multi-walled carbon nanotubes and the Fe(CN)6
3-/Fe(CN)6
4- based electrolyte. The developed cell demonstrates the current density values of more than 13 A/m2 and a specific power of 140 mW/m2. Hypothetical Seebeck coefficient was found equal to 0.7 mV/K by the calculation based on the temperature dependencies of the open circuit voltage.
Investigation of the properties of two-dimensional molybdenum disulfide films synthesized by the CVD method
Authors: Smagulova S , Semenova A , Zakharkina E , Vinokurov P 
Published: November 2019

Abstract
Molybdenum disulfide films were synthesized through chemical vapor deposition. Optimal synthesis parameters (temperature, time, gas pressure, gas flow rates, and geometrical arrangement of substrates and crucibles with precursors), allowing for the growth of single-layer domains of molybdenum disulfide with maximum domain sizes (250 μm), were found. The technology for processing substrates, including mechanical, chemical and plasma-chemical processing, was developed. The results of studies on the structural, optical, electrical properties of the synthesized and transferred films using optical, scanning electron and atomic force microscopes, elemental analysis, measurement of Raman scattering spectra, luminescent and electrical characteristics are presented.
Plasma-chemical synthesis of carbon nanotubes and graphene with mesoporous architecture for energy applications
Authors: Shavelkina M , Shkolnikov E , Kochanova S , Sidorova E 
Published: November 2019

Abstract
We develop the universal technique of producing the mesoporous carbon nanomaterials. We manage to synthesize, in one and the same reactor, in the different regimes, carbon nanotubes and graphene. The technique consists in conversion of the carbon containing substances in the helium plasma flow generated by the plasma torch at low pressure. We investigate the samples using the scanning electron microscope and the synchronous thermal analysis. The studies, by the limited evaporation method, of the porous structure show that the graphene flakes and the balled nanotubes are mesoporous and thus provide the specific capacity value rather high for the electrochemical electrodes of the supercapacitor (125–133 F/g) at the charging/discharging resistance of 121/100 Ω.
Fireproof intumescent systems modification by means of phosphorus-containing metal/carbon nanocomposites for construction applications
Authors: Mustakimov R. , Kodolov V. , Kodolova-Chukhontseva V. 
Published: November 2019

Abstract
In the present paper, a method for modifying a copper/carbon nanocomposite with ammonium polyphosphate is considered. The optimum ratio of reagents at the modification of composite was found using infrared and X-ray photoelectron spectroscopy. Experimental tests were carried out for samples of fireproof intumescent coatings based on epoxy resins modified with the phosphorus-containing copper/carbon nanocomposites. An increase of more than 20 % in such properties as adhesive durability and fire-retardant performance for the coatings modified with the above nanocomposites was determined.
Production of graphene concentrates based on synthetic oils in rod drum mills
Authors: Pershin V F , Zhumagaliyeva G B , Tkachev A G , Pasko A A , Vorobyev A M 
Published: November 2019

Abstract
The article presents the results of the refinement of the mathematical model of the process of liquid-phase shear exfoliation of graphite and experiments on the production of graphene concentrates based on synthetic oils in a rod drum mill. The model parameters were identified and its adequacy to the real process was experimentally confirmed. It is given the dependence of the coefficient of light absorption, which characterizes the average integral value of graphene layers in suspension particles and their concentration on the processing time.
Features of optimization synthesis of equipment for feeding nanodispersed materials
Authors: Popova A , Shubin I , Kucherova A , Memetov N , Tarov D 
Published: November 2019

Abstract
For the first time, in the analysis of the behavior of a nanodispersed material (i.e., its outflow and batching from the hopper unit, as well as movement and mixing), a conventional approach was used to calculate the hardware and technological design of its functionalization. Besides, the features of the behavior of the nanodispersed layer and single nanoparticles as applied to the feeding process from the hopper under vibrations, its movement along the guide blade and the pouring of the flow into the receiving tank were considered, dependencies were formulated, and recommendations were given for designing the hopper assembly used to process the nanodispersed materials. The results were tested and showed high convergence in practical implementation.
Egyptian propolis 14: Potential antibacterial activity of propolis-encapsulated alginate nanoparticles against different pathogenic bacteria strains
Authors: Hegazi A G , El-Houssiny A S , Fouad E A 
Published: November 2019

Abstract
The present study evaluates the synergistic antimicrobial effect of the propolis-encapsulated alginate nanoparticles (propolis-ALg NPs) against different pathogenic bacteria. The prepared samples were characterised by transimissin electron microscope (TEM), Fourier-transform infrared spectroscopy (FTIR), zeta potential and dielectric spectroscopy. The morphological analysis using TEM revealed that, the propolis-ALg NPs are spherical, discrete and have a small particle size (13 nm) in the nanometer scale. FTIR studies showed a spectral change of the characteristic absorption bands of ALg NPs after being encapsulated with propolis. A high negative zeta potential value is obtained for propolis-ALg NPs which indicates a high suspension stability of the prepared formulation. The dielectric study showed a decrease in the dielectric constant (ε′), dielectric loss (ε″) and conductivity (σ) values after the incorporation of the propolis into ALg NPs. All these investigations confirm the successful encapsulation of propolis within ALg NPs. On the other hand, the propolis-ALg NPs sample showed the highest antimicrobial activity against all examined pathogens in comparison with pure propolis and/or antibiotic (clindamycin). So, it can be concluded that the propolis-ALg NPs exhibited a synergistic antibacterial activity against different bacterial strains.