bluuebunny/crossref_metadata_2025_split huggingface dataset:
Polymer composites based on halogen-containing oligoethers
Authors: Bazheva R Ch , Borodulin A S , Kalinnikov A N , Charaev A M 
Published: December 2019

Abstract
Halogen-containing oligosulfones based on 1,1-dichloro-2,2-di (4-hydroxyphenyl) ethylene and 4,4’-dichlorodiphenylsulfone on various degrees of condensation were synthesized in the solution by high-temperature polycondensation. Conducted a physical modification of indutrial polycarbonate bisphenol A oligosulfones obtained in a wide concentration range. Physical and mechanical properties of composites are investigated. The compatibility of the obtained oligosulfones with polycarbonate was studied using viscometry, differential scanning calorimetry, and probe microscopy. It was shown that the introduction of oligosulfones into the polycarbonate matrix promotes an increase in the glass transition temperature, found by differential scanning calorimetry, at 3 to 20 ° C, depending on the composition, the composites have good dielectric and technological properties. The temperature dependences of the dielectric properties of PCs and PC-based composites with different oligosulfone content are characterized by the presence of a single loss on the dielectric loss tangent dependences on the temperature.
Improving the fire resistance of PVC plastic the introduction ammonium octamolybdate
Authors: Borukaev T A , Kharaev A M , Shaov A Kh , Borodulin A S , Kalinnikov A N 
Published: December 2019

Abstract
An efficient method for the synthesis of ammonium octamolybdate with a quantitative yield has been developed. Compounds based on PVC plastic and octamolybdate are obtained. It was found that the introduction of ammonium octamolybdate in PVC plastic leads to an increase in the fire resistance of the compound and to a decrease in smoke formation during its combustion. At the same time, the mechanism for reducing smoke emission during PVC plastic combustion in the presence of ammonium octamolybdate consists in its catalytic action in the conversion of soot particles into various oxidized forms. It is shown that PVC plastics containing ammonium octamolybdate have elevated oxygen index and coke residue.
Technology of applying antifriction coatings using an electric arc pulsating power
Authors: Kravchenko I N , Petrovsky D I , Glinsky M A 
Published: December 2019

Abstract
The coating of a mechanical mixture of metal powders and solid lubricant material is due to difficulties due to the low adhesive and cohesive strength of the resulting coatings. This problem can be avoided when using in the process of the pulsating power electric arc (PPEA). The object of research in the paper is an anti-friction coating based on ΠΓ-XH80CP3 powder with the addition of 20% by volume of graphite ΠΓ-50, of which plasma coating using PPEA gave a coating with friction coefficients fmp min = 0.038 and fmp max = 0.062 under contact load of 300 MPa. The test results of a friction pair, carried out for 500 hours on a path of friction of 55,000 m, showed the stability of the friction coefficient within fmp = 0.056 … 0.061. The application of the coating process using the surface activation of the PPEA allowed us to obtain high-strength anti-friction coatings with the content of a solid lubricant element in the coating composition up to 20% of the total coating volume.
Engineering and technological methods of ultra-jet diagnostics of complex-profiled products made of composite materials
Authors: Barzov A A , Belov V A , Galinovsky A L , Mazaeva I V 
Published: December 2019

Abstract
An engineering technique for ultra-jet diagnostics of the state parameters of complex profiles surface layer of polymer composite materials which are obtained by winding or laying is proposed. The possibility of increasing the accuracy of obtaining express-diagnostics results under varying conditions of interaction of the hydro-ultra jet with the test surface is shown.
Microporous PVDF ionic membranes for actuator applications prepared with imidazole-based poly(ionic) liquid as a pore forming material
Authors: Morozov O S , Shachneva S S , Kepman A V 
Published: December 2019

Abstract
The microporous poly(vinylidene fluoride) (PVDF) membranes were prepared by phase inversion process using poly(1-ethyl-3-vinylimidazolium tetrafluorborate) (PIL) as a pore-forming agent. The membranes were activated by soaking in room temperature ionic liquids (EMImBF4 and BMImBF4) as a liquid electrolyte. The influence of PIL content on morphology and structure, electrolyte uptake of porous membranes and ionic conductivity of the activated membranes were investigated. The properties of the PVDF microporous membranes, such as crystallinity and porosity were characterized. The membrane with the maximum porosity demonstrates the highest electrical properties. The electrolyte uptake of EMImBF4 is 210 wt.% and the ionic conductivity is 9.2 mS/cm. Actuators with carbon nanotube bucky gel electrodes based on obtained membranes were prepared. The influence of ionic liquid and actuator thickness on electromechanical properties was discussed. The actuators with BMImBF4 as a electrolyte demonstrated high blocking force up to 9.5 mN.
Development of the radiant heating facilities for the testing of ceramic materials with operating temperatures up to 2000 K
Authors: Baldzhiev R S , Prosuntsov P V , Zabezhailov M O 
Published: December 2019

Abstract
The radiant heating facilities based on tungsten halogen lamps are frequently used for high-temperature materials experimental study and aerospace hot structures functional testing. The ease of maintenance and operation as well as the relatively low cost and high efficiency are the main advantages of halogen lamps as a heating source. However, the significant disadvantage of halogen lamps is the limitation of the facility operating temperature. It could not exceed 1500 K due to the tungsten-halogen cycle disruption. Current paper investigates the feasibility of the facility operating temperature expansion up to 2000 K by means of the lamps cooling with a compressed air flow. The mathematical simulation of a complex heat transfer in the facility operating area was performed. The design-layout schemes for several facilities were proposed. The modelling results proved the performance of the proposed design-layout schemes.
Study of the GTE stator vane samples made from a Al-SiC metal matrix composite reinforced by SiC.
Authors: Berezovskiy V V , Kurganova J A 
Published: December 2019

Abstract
Al-SiC system metal matrix composites application in gas turbine engine ventilator stator blade is shown. Mechanical properties of Al-SiC system metal matrix composite in comparison with aluminum and titanium alloys is shown. Mechanical properties of gas turbine engine ventilator stator blade is shown.
Design calculation of braided high-temperature composite structures
Authors: Smerdov A A 
Published: December 2019

Abstract
Following a review of published papers devoted to calculations of braided composite structures, basic requirements for computational models are formulated. A mathematical model intended for design calculations of braided structures of shells of revolution is presented. The dependences for calculating the stiffness, thermal deformation, and strength characteristics of a braided composite material are given depending on the braiding scheme, reinforcement angle, and the current radius of the shell. The relationship between the angle of reinforcement, the thickness of the single-pass layer and the coverage rate of the structure that determines the degree of continuity of the layer is investigated. The features of calculations of structures with a two-axis and three-axis braiding scheme are discussed. Examples of calculations of specific composite structures are given, the dependences of elastic moduli, coefficients of linear thermal expansion and ultimate strengths on the variation of the radius of a typical braided carbon-ceramic composite shell are demonstrated.
The effect of triethylene glycol additive on the self-healing properties of epoxy binder
Authors: Petrova T V , Solodilov V I , Kabantseva V E , Karelina N V , Polezhaev A V 
Published: December 2019

Abstract
A triethyleneglycol-modified epoxy composition based on diglycidylfurfurylamine (FuEp) and 1,1’- (methylene-di-4,1-phenylene)bismaleimide (BMI) was cured with methyl hexahydrophthalic anhydride (MHPPA). The components of the composition can reversely binds through Diels-Alder reaction between furan and maleimide moieties. We studied the effect of TEG additive on the rheological and thermophysical properties of the binder, as well as the ability through thermal treatment. All compounds were characterized with NMR and IR spectroscopy. It was shown that TEG significantly reduces the curing time and the glass transition temperature of the cured samples, which allows to speed up the process of self-healing.
Finite element modelling and multi-objective optimization of composite submarine pressure hull subjected to hydrostatic pressure
Authors: Fathallah E , Helal Mahmoud 
Published: December 2019

Abstract
The design of submarine pressure hull made of laminated composites depends on number of layers and fibre orientation of ply angle. In the present study an overview and comprehensive study about the multi-objective optimization of composite pressure hull under hydrostatic pressure to minimize the weight of the pressure hull and increase the buckling load capacity according to the design requirements. Three models were constructed, two models constructed from Carbon/Epoxy composite (USN-150) with and without core layer the third model is metallic submarine hull constructed from HY100. The low-density PVC foam material is used as a core material. The optimization process is carried out in ANSYS Parametric Design Language (APDL). The constraints on the optimization process are Tsai-Wu and maximum stress failure criteria. The results obtained emphasize that, the submarine constructed from Carbon/Epoxy composite (USN-150) is better than the submarine constructed from HY100. Furthermore, the submarine constructed from carbon fiber-epoxy composite (USN-150) with core layer is better than the submarine constructed from carbon fiber-epoxy composite (USN-150) without core layer. Finally, an optimized model with an optimum pattern of fiber orientations was presented. Hopefully, the results may provide a valuable insight for the future of designing composite underwater vehicles.
Study of the effect of permeability coefficients in a threedimensional formulation for fabrics various types of fabric structures
Authors: Maung Pyi Phyo , Malysheva G. 
Published: December 2019

Abstract
The results of theoretical and experimental studies of the kinetics of the impregnation process for 4 types of woven structures depending on the thickness of the molded parts are presented. The calculations were carried out with and without the permeability coefficient in the z plane. All calculations were performed in the PAM-RTM program. It has been established that considering the permeability coefficients along the x, y, z axes allows to increase simulation accuracy. As a result of the research it was found that with increasing laminate thickness more than 3 mm, it is necessary to consider the influence of the coefficient of permeability in the z-plane. Simulation error without taking into account the through thickness permeability coefficient increases from 6% to 22%.
Analysis of anisotropy of time-dependent and nonlinear properties of unidirectional CFRP
Authors: Dumansky A M , Liu Hao 
Published: December 2019

Abstract
Analysis of unidirectional carbon fiber reinforced plastic AS4/3501-6 regularities under strain-rate compression was given. Constitutive equations based on nonlinear hereditary mechanics relationships under shear in plane of the layer were elaborated. In order to obtain the constitutive equations, which are allowing describing the stress-strain curves of unidirectional carbon-fiber reinforced specimens under compression at different angles to the direction of reinforcement in the linear region, the algebra of resolvent operators and the relations of the elasticity theory of an anisotropic body were used. The possibility of correct using of the elaborated approach was shown.
Investigation of mechanical characteristics of a carbonceramic composite material based on a braided preform
Authors: Baryshev A N , Kulish G G , Smerdov A A , Timofeev I A , Tsvetkov C V 
Published: December 2019

Abstract
An experimental analysis of characteristics of a carbon-ceramic composite material based on a braided preform in a plane stress state was carried out. The technical limits of strength and elastic characteristics of the material are determined. Tests of tubular specimens in a complex stress state allowed us to obtain the data necessary for the constrction of the failure criterion. The possibilities of using various failure criteria of the composite are investigated. The contours of the surface of the strength of the material in the space of stresses at the intersection of its coordinate planes are built.
Atomic force microscopy of titanium oxide nanostructures with forming-free resistive switching
Authors: Avilov V I , Smirnov V A , Tominov R V , Sharapov N A , Avakyan A A , Polyakova V V , Ageev O A 
Published: December 2019

Abstract
The paper presents the results of study of the resistive switching effect in titanium oxide nanostructures obtained by local anodic oxidation. It was shown that the resulting structures exhibited a forming-free resistive switching effect. Analysis of the current-time characteristics made it possible to obtain a resistance ratio in the HRS and LRS states of about 70. The formed LRS regions persisted for 75 days.
Microscopy investigation of conical and layered nanowires
Authors: Cherkasov D A , Panov D V , Doludenko I M , Kanevskiy V M , Muslimov A E , Zagorskiy D L , Biziaev D A , A Bukharaev A 
Published: December 2019

Abstract
This article discusses the use of scanning microscopy in the study of one-dimensional nanostructures – nanowires. The nanowires were produced by matrix synthesis. Atomic force microscopy (AFM) of conical nanowires was carried out, and layered nanowires were investigated by AFM and magnetic force microscopy (MFM) methods.
Study of structure-property relationship in steels based on analysis of EBSD data
Authors: Chikova O A , Chezganov D S , Yuzhakov V V , Sinitsin N I 
Published: December 2019

Abstract
In this work, we formulate novel data-driven assays for exploring the structure-property linkages for high-manganese austenitic wear-resistant steel 110G13L (Hadfield steel). Steel 110G13L has the following chemical composition, wt.%: C(0.95-1.50)-Mn(11.5-15.0). These assays are built on recent advances in high resolution quantification of material structure using correlations and principal analyses of electron backscatter diffraction (EBSD) data, as well as in the mechanical characterization using nanoindentation. These novel protocols are demonstrated on a steel 110G13L that exhibits various polycrystalline microstructures. A comparative analysis of EBSD data was carried out for samples of manganese steel 110G13L obtained by various methods. Analysis of the diffraction patterns of backscattered electrons allowed us to plot orientation maps, Schmid factor maps and distributions for austenite dendrites. Schmid factor maps are used to determine the degree of homogeneity of a possible deformation. The results of the measurement of hardness and Young’s modulus for the austenite dendrites indicate the heterogeneity of the mechanical properties of the material in submicro-volumes due to lattice defects (dislocations) inside the crystallites.
SEM investigation of the microstructure of cast CuNiAlCoFe equiatomic high entropy alloy
Authors: Chikova O A , Chezganov D S , Tsepelev V S , Yu Ilyin V 
Published: December 2019

Abstract
Microheterogeneity and crystallization conditions of the equiatomic high-entropy CuNiAlCoFe alloy were studied by measuring the viscosity during heating/cooling, as well as visualizing the microstructure after solidification. The CuNiAlCoFe liquid alloy showed different temperature dependences of viscosity upon heating to 2070 K and subsequent cooling. Since the coinciding part of the temperature dependences was absent, complete destruction of the microheterogeneity of the melt after heating to 2070 K did not occur. Heating the melt to higher temperatures was not possible due to the evaporation of the metal. The melt viscosity during cooling is higher than that during heating; this is observed when microheterogeneity is dispersed. The CuNiAlCoFe alloy obtained as a result of the experiment at a crystallization rate of 10 K/s had a typical microstructure of cast dendrite. Dendrites consisted of a eutectic (α-Al+CuAl2+Cu4NiAl7) and included primary crystals of CoCu2Al7 and FeCu2Al7. The interdendritic space contained small Cu4NiAl7 crystals.
Domain structure of CoNi microparticles under mechanical stress
Authors: Nurgazizov N I , Chuklanov A P , Biziyaev D A , Bukharaev A A , Chirkov V V 
Published: December 2019

Abstract
In this work, the results of the study of the domain structure of planar CoNi microparticles are presented. The microparticles represented squares with a side of 7 μm and height of 0.03 μm. It was shown that in the non-stressed state the particles had the regular four-domain state. The mechanical stress (compression) of the particles led to a change in domain size, which depended on the degree of compression, the angle between the direction of magnetization, and the side of the mechanical stress. Under the mechanical stress, the change in the coercive force and the residual magnetization of the particles was observed.
Gas sensing properties of individual composite nanostructures TiO2-x/MWCNT and SnOx/MWCNT measured by scanning probe microscopy
Authors: Davletkildeev N A , Sokolov D V , Mosur E Yu , Bolotov V V 
Published: December 2019

Abstract
The gas sensitivity properties of individual composite nanostructures based on multi-walled carbon nanotubes (MWCNT), functionalized by argon ions and coated with tin and titanium oxides, were investigated by the methods of scanning probe microscopy. The Fermi level shift and the change in longitudinal conductance of nanostructure upon absorption of ammonia and nitrogen dioxide are determined. It is shown that the change in conductance of the composite nanostructures correlates with the Fermi level shift under gases exposure as a result of charge carrier concentration changing in the metal oxide surface layers upon adsorption of gas molecules.
The effect of optical cooling of the SPM probe in the optomechanical resonator
Authors: Dunaevskiy M S , Alekseev P A , Sharov V A , Baranov A 
Published: December 2019

Abstract
Optomechanical resonators formed by the surface of an emitting semiconductor laser and the reflective surface of the probe of scanning probe microscope (SPM) were studied. The use of scanning probe microscopy techniques allowed studying the properties of such optomechanical resonators in details. The effect of optical cooling of an SPM probe in an optomechanical resonator was investigated by measuring the spectra of thermal vibrations of an SPM probe. Minimal achievable temperatures of SPM probe cooling were experimentally established.
Electron beam processing of 6H-SiC substrate to obtain graphene-like carbon films
Authors: Gusev E Yu , Dudko V G , Avramenko M V , Karmanov M P , Avdeev S P , Kolomiytsev A S , Ageev O A 
Published: December 2019

Abstract
We report on growth of graphene-like carbon films on 6H-SiC {0001} substrate by electron-beam. The processing was carried out on a specialized electron beam system with the Pierce electron gun. The D, G, and 2D peaks as well as D/G (0.2-0.9) and 2D/G (0.7-0.9) ratios are detected on processed samples by Raman spectroscopy. The prominent bands D, G, and 2D are located at 1350, 1584, and 2707 cm−1, respectively. Atomic force microscopy showed that the average roughness lies in the range from 5 to 30 nm, and ten point height – from 40 to 200 nm. The results demonstrate that the electron-beam technique is appropriate to form graphene-like structures directly on 6H-SiC substrates and could be used for electronic device fabrication.
Uncertainty of tunnelling microscopy measurements of the field emission from multilayer nanostructures
Authors: Panfilova E V , Syritskii A B , Ibragimov A R 
Published: December 2019

Abstract
The paper presents the results of scanning tunnelling microscopy investigation of electron field emission from multilayer nanostructures based on silica opal film Cr-SiO2-Au-C. Opal film was deposited in colloidal solvent, while other films – by vacuum deposition methods. We discuss the problem of uncertainty of measurements of the field enhancement factor and carbon nano-edge sizes using the current versus applied voltage characteristics of the emission. Field enhancement factor is defined as the ratio of the electric field at the nano-edge to the field applied to the gap. We found that at well-controlled experimental conditions the combined uncertainty of field enhancement factor measurements is ∼15% based on a 95% confidence interval and the combined uncertainty of nano-edge sizes measurements is ∼18% based on a 95% confidence interval.
High temperature superconductivity at the interface Ba0.8Sr0.2TiO3/La2CuO4
Authors: Pavlov D P , Piyanzina I I , Garig’yanov N N , Salikhov T M , Chibirev A O , Gilmutdinov I F , Yusupov R V , M Mukhortov V , Adachi T , Kawamata T , Koike Y , V Kabanov V , F Mamin R 
Published: December 2019

Abstract
We present the results of the investigations of high conducting area and superconductivity at the interfaces between ferroelectric oxide and insulating oxide in heterostructures, isostructural to BaTiO3/La2CuO4. The performed numerical simulations of BaTiO3/La2CuO4 heterostructure show the possibility of high conductivity state at the interface. The temperature dependence of the measured electrical resistance of the Ba0.8Sr0.2TiO3/La2CuO4 heterostructure interface have been studied and the superconducting behaviour with transition temperature Tc about 30K has been found. Therefore, the transition to the state with 2DEG at the interface is demonstrated. The results offer the possibility to design novel electronic devices.
Radial non-uniform piezoelectric response of perovskite islands in thin PZT films
Authors: Senkevich S V , Kiselev D A , Ilina T S , Osipov V V , Elshin A V , Pronin V P 
Published: December 2019

Abstract
A comparative study of the morphology and piezoelectric response of island and continuous perovskite thin PZT films deposited on a platinized silicon substrate Si/SiO2/TiO2/Pt was carried out. It was shown that the self-polarization value of micron-size island films was about 1.4 times higher than that of continuous films. It is assumed that the difference is due to the relaxation of tensile mechanical stresses caused by silicon substrate at the island periphery.
Scanning probe microscopy investigation of iron garnet films for magnetoplasmonics
Authors: Shaposhnikov A N , Lyashko S D , Nedviga A S , Karavainikov A V , Yu Semuk E , Vysokikh Yu E , Mikhailova T V 
Published: December 2019

Abstract
Topography and domain structures of Bi-substituted iron garnet films proposed for magnetoplasmonic applications are presented. Investigations were carried out by scanning probe microscopy methods, including polarization near-field optical microscopy. The most suitable films with less rough surface were chosen. The period of domain structure of sputtered film of composition Bi2.8Y0.2Fe5O12 were determined, 2w = 0.5 μm.