bluuebunny/crossref_metadata_2025_split huggingface dataset:
Thermochemical grinding of diamond films in installation for chemical vapor deposition of diamond from the gas phase
Authors: Eremin S A , Kolesnikova A M , Leontiev I A , Anikin V N , Yu Kudryashov O , Yashnov Y M , Zhdanova M V 
Published: May 2020

Abstract
The paper studies the process of thermochemical grinding of diamond polycrystalline films in atomic hydrogen, using microwave to generate a plasma discharge, in the temperature range 1000 - 1100 0C. It is established that the increase in temperature leads to an increase in the rate of diamond dissolution due to the formation of eutectic. The study of roughness showed that after thermochemical grinding roughness of the diamond film is about 0, 8 urn. The speed of thermochemical grinding varies from 20 um/h to 3 mm/h Raman spectroscopy allowed us to establish that thermochemical grinding does not degrade the quality of the diamond film, and atomic hydrogen reduces the possible graphitization caused by heating.
It is suggested that the mechanism of gas bubbles in the process of thermochemical grinding associated with the formation of methane and its subsequent decomposition into a methyl radical and atomic hydrogen in the plasma discharge.
Reactionary-solidified oxygen permeable membrane material based on cermet Bi1.6Er0.4O3 – 26 wt % Ag – 4 wt % In
Authors: Fedorov S V , Lysenkov A S , Kulbakin I V 
Published: May 2020

Abstract
Using hot uniaxially pressing in argon atmosphere at 800 °C and at a stress of 6 MPa, the high-density reactionary-solidified cermet material based on Bi1.6Er0.4O3 - 26 wt % Ag - 4 wt % In with total porosity of less than 0.3 % was firstly synthesized. The relationship between phase composition, microstructure, oxygen permeability coefficient, and oxygen selectivity (vs air nitrogen) of this material before and after its long-term (100 hours) operation as an ion transport membrane was established. The dependences of oxygen transport through this cermet material at 650-800 °C were investigated: for example, at 800 °C and at a ratio of oxygen partial pressures on both sides of the membrane of about 20, the oxygen transfer regime changes from diffusion to kinetics while the characteristic thicknesses of membrane were of 0.11 cm. It was shown that at 800 °C the membrane material based on Bi1.6Er0.4O3 - 26 wt % Ag - 4 wt % In had an oxygen permeability coefficient of 1.1 • 10−8 mol/cm/s, while its selectivity for oxygen (over nitrogen) was about 100. The decrease in oxygen flux by 1.3-1.5 times during 100 hours of work at 700-800 °C with a slight change in oxygen selectivity was observed, thus the possible causes of this phenomenon were explained.
Spectrophotometric determination of epinephrine using new analytical systems based on label-free silver triangular nanoplates
Authors: Furletov A A , Zaytsev V D , Apyari V V , Garshev A V , Volkov P A , Dmitrienko S G 
Published: May 2020

Abstract
Silver triangular nanoplates (AgTNPs) is a promising and still relatively poorly studied colorimetric probe for sensing various organic compounds. In particular, they undergo a change in their morphology when interacting with various catecholamines. This process is accompanied by a hypsochromic shift of the local surface plasmon resonance (LSPR) band of nanoparticles. The greatest spectral changes can be observed in the case of the interaction of AgTNPs with epinephrine which can be the basis for a sensitive method for its detection. It was found that the detection limit of epinephrine under the selected optimal conditions is equal to 3 uM, and the dynamic range is from 9 uM up to 50 uM. Selectivity of the proposed method for the epinephrine determination was evaluated as well. It was shown that the determination does not interfere with a 10-fold excess of vanillylmandelic acid and dopamine, and with a 1000-fold excess of common cations and anions. The proposed approach was successfully applied to the determination of epinephrine in a drug and a sample of artificial urine containing an epinephrine additive.
The study of model reactions occurring in the synthesis of adaptive multiblock polyurethanes
Authors: Gorbunova M A , Imamutdinova A M , Lodygina V P , Anokhin D V , Badamshina E R 
Published: May 2020

Abstract
In the paper a study of formation process of linear polyurethane on the basis of 4, 4′-diphenylmethane diisocyanate, poly(1, 4-butylene adipate) diol and 1, 4-butanediol is presented. The kinetics of the first stage of macrodiisocyanate formation reaction was studied by IR spectroscopy. Experimental and calculated values of the rate constant of the first reaction stage were obtained. The influence of the solvent on the polyurethane structure was defined. The conditions to fabricate polymer with a maximum crystallinity degree have been determined. Important results for the synthesis of the shape memory multiblock polyurethane thermoplastic elastomer have been obtained.
Using of direct piezo-discharge in generation of plasma-activated liquid media
Authors: Konchekov E M , Gusein-zade N G , Kolik L V , Artem’ev K V , Pulish A V 
Published: May 2020

Abstract
This article shows the possibility of plasma-activated liquid media generation using the least energy-consuming source of low-temperature plasma, based on the use of a piezoelectric transformer. The experiments determined the possibility of producing reactive oxygen and nitrogen species in deionized water and culture media. The concentrations of H2O2 and NOx were estimated depending on the energy deposition.
Study of the effect of crystallization conditions on the structure of polyurethane block copolymer based on poly-ε-caprolactone diol and isophoron diisocyanate
Authors: Gorbunova M A , Lelecova V A , Shukhardin D M , Malkov G V , Anokhin D V , Badamshina E R 
Published: May 2020

Abstract
In the paper a study of isothermal crystallization kinetics of polyurethane on the basis of poly-ε-caprolactone diol, isopforon diisocyanate and 1, 4-butanediol is presented. The process of isothermal crystallization in the temperatures range from -15 to 30ºC was studied by DSC method. Analysis of total melting enthalpy and degree of crystallinity of the polyurethane allows to obtain material with one or two melting points of polyester block at desired temperature. These results will help in design of new thermoplastic elastomers with one- or two-stage shape memory effect.
Effect of synthesis parameters on the structure and properties of carbon particles formed from amorphous fullerites
Authors: Lukina I N , Chernogorova O P , Drozdova E I , Ekimov E A , Apostolova M O , Prokopenko D A , Soldatov A V , Benavides V 
Published: May 2020

Abstract
The effect of high-pressure synthesis temperature on the structure and indentation characteristics of the superelastic hard carbon formed from amorphous fullerites and on the tribological properties of the Co-based composite materials (CM) reinforced by the particles of such carbon has been studied by Raman spectroscopy, high-resolution transmission electron microscopy (HRTEM), indentation measurements, and tribological tests. It is shown that ball milling (for 48 h) of C60 fullerite crystals results in the amorphization of the product of fullerite transformation upon their high-pressure treatment at temperatures above the stability limit of fullerene molecule (∼800°C). An increase in synthesis temperature at 8 GPa from 800°C to 1200°C leads to a gradual graphitization of the structure of amorphous fullerite derived carbon. This decreases its hardness and indentation modulus from 32 to 18 GPa and from 256 to 95 GPa, respectively, and increases the elastic recovery (from 80% to 86%). The best tribological characteristics of the CM are attained at the maximum particle hardness, which is realized in the CM synthesized at 800°C. When the synthesis temperature is elevated to 1200°C, the friction coefficient and wear rate of the CM increase, but they remain substantially lower than those of the matrix cobalt.
Scandium extraction from multicomponent systems by crystallization of complex sulfates
Authors: Pasechnik L A , Medyankina I S , Yatsenko S P 
Published: May 2020

Abstract
Red mud generated from alumina production is one of the most promising scandium resources. Leaching for concentrating scandium and other valuable metals is often performed with the use of acid solutions in specially selected conditions. Different precipitants can be employed for selective precipitation of scandium in the form of poorly soluble compounds. A new method for the crystallization of ammonium scandium sulfates from sulfuric solutions was carried out in this study. Depending on the ammonium cation concentration, precipitation is possible in the form of NH4Sc(SO4)2 or (NH4)3Sc(SO4)3. The solubility values for NH4Sc(SO4)2 and (NH4)3Sc(SO4)3 in water established by the isothermal saturation method were 9.02 and 12.89 g/l Sc2O3, respectively. Complete precipitation of the most promising gravimetric form of scandium represented by NH4Sc(SO4)2 was achieved at 5-6 M H2SO4 and 0.5 M NH4
+. The product of crystallization from sulfuric solution used for treating poor scandium concentrate produced from red mud is a mixture of polymorphs of the composition NH4Sc(SO4)2. Co-precipitated impurities of Al, Fe, Ti, Zr etc. are separated after repeated dissolution and precipitation of ammonium scandium sulfate under analogous conditions. The recrystallization product after calcination at 1000°C contains 99% Sc2O3.
Sintering and physico-mechanical properties of materials based on silicon nitride nanoscale powders
Authors: Perevislov S N , Lukyanova O A , Lysenkov A S , Kim K A , Vysotin A B 
Published: May 2020

Abstract
Obtained a high-density material (p = 3, 28 g/cm3, a porosity of 1, 4 %) on the basis of silicon nitride powder by liquid phase sintering nanoscale. Displaying pressing pressure on the density of sintered materials the based silicon nitride. The process of pattern formation material during sintering. The main physico-mechanical characteristics: the density, porosity and grain size of the solid phase, the modulus of elasticity, flexural strength, fracture toughness ratio, Vickers hardness.
Studying the properties of carbides in the system ZrC–HfC, TaC–ZrC and TaC–HfC
Authors: Perevislov S N , Vysotin A B , Yu Shcherbakova O 
Published: May 2020

Abstract
Considers the chemistry of carbides of zirconium, hafnium and tantalum and their high temperature properties. By hot pressing the obtained dense materials in the systems ZrC– HfC, TaC–ZrC, and TaC–HfC analysed their microstructure, physical and mechanical properties.
Structural changes after high-speed impact of tungsten powder with a steel target
Authors: Petrov E V , Trofimov V S , Saikova G R , Kopytskiy V O 
Published: May 2020

Abstract
Shock-wave high-velocity impact of tungsten powder with a steel target was studied in the work. It is determined that shock wave treatment of the samples leads to a refinement, flattening and stretching of ferrite and perlite grains in the surface layer. The structural transition from plate perlite in the near-surface layer of the target to coarse-plate perlite in the bulk of the target, the microstructure of which does not differ from the microstructure of the initial sample, was detected in the structure of U8 steel after a particle flux. It is found that cellular supercooled austenite with tungsten carbide mesh along grain boundaries is formed in the structure of steel. The microhardness of the target in depth after exposure to tungsten particles is analyzed. It was shown that the microhardness distribution along the width of the sample is wave-like, and the microhardness decreases monotonically along the depth of the sample. The microhardness maximizes by 24% at a distance of 4 mm from the surface compared to the original microhardness.
Oxidation and biodegradation of polymeric composites based on polylactide: structure and properties
Authors: Podzorova M V , Tertyshnaya Yu V 
Published: May 2020

Abstract
Polymer blends of polyethylene – polylactide of different composition were obtained and studied. Thermal degradation was investigated in the temperature range from 20 to 700 °C. It is shown that the polyethylene more resistant to the effects of temperature (peak of destruction - 414 °C) than polylactide (peak degradation – 364 °C). In blends with increasing polyethylene content in the matrix increases the maximum temperature of thermal degradation. The process of thermal oxidation carried out at temperatures of 80, 90, 110 °C and a pressure of 300 Torr. Binary polylactide–low-density polyethylene blends of various compositions were prepared, and their biodegradability in soil. The weight loss is higher upon incubation in laboratory soil compared to open soil.
METALS RECOVERY FROM MOLYBDENITE CONCENTRATE BY ELECTROOXIDATION AND LEACHING
Authors: Rasulova S N , Guro V P , Safarov E T , Adinaev X F 
Published: May 2020

Abstract
Mineral resources today are increasingly determined by the concept of “persistent”. The reason for their difficult opening is in the composition of sulfide nature, leading to passivation of the surface and inhibition of hydrometallurgical processes. The way out in practice was found in oxidative firing and some other technologies. The work compares the results of leaching of molybdenite concentrate of Almalyk MMC JSC according to the schemes: the existing calcining-ammonia and non-calcining with nitric acid, hypochlorite opening and leaching. Non-calcining with hypochlorite opening and leaching scheme is not only ecologically cleaner in compare with pyro-metallurgy, but it relocates quantitatively to the solution not only molybdenum, rhenium, but gold and silver as well.
Study of sintered aluminum materials with nanoparticles microadditions
Authors: Agureev L E , Savushkina S V , Laptev I N , Ivanov B S , Ivanov A V , Kostikov V I , Eremeeva Zh V 
Published: May 2020

Abstract
Sintered aluminum materials with small additions (0.01-0.15 vol.%) of aluminum, zirconium and magnesium oxide nanoparticles were obtained by powder metallurgy. The microstructure of the samples and the effect of the nature and concentration of nanoparticles on the matrix grain size, density, microhardness, and corrosion resistance in 10% solutions of nitric and sulfuric acids were studied. The addition of nanoparticles led to matrix grains decrease, an increase in the density, microhardness, and corrosion resistance of sintered aluminum samples. The lowest value of grain size was shown by the sample with 0.1% vol. magnesium oxide. Sintered aluminum material with 0.05% vol. zirconium oxide nanoparticles had the highest density∼ 2.67 g/cm3. The highest Vickers microhardness at the level of 0.474 GPa was obtained for material with the addition of 0.1 vol.% Al2O3 nanoparticles. All samples showed significantly greater corrosion resistance in comparison with pure sintered aluminum. The samples with nanoparticles withstood 30 hours of testing, and pure aluminum dissolved in nitric acid in 15 hours, and in sulfuric acid in 10.
Research of thermoradiation properties and expansion of tantalum carbide at high temperatures
Authors: Senchenko V N , Belikov R S , Tenishev A V 
Published: May 2020

Abstract
The article describes an experimental method for studying of the thermophysical properties of refractory carbides, in particular for studying thermal expansion and radiation spectra of the sample during millisecond pulse electrical heating. As a result emission spectra of tantalum carbide were obtained in the temperature range 2400-3000 K. Also the data obtained make it possible to determine the coefficient of thermal expansion and thermoradiation properties of high refractory carbides, in particular for tantalum carbide.
Optimization potential of anaerobic biocatalytic processes using intracellular ATP concentration as the main criterion for decision making
Authors: Senko O V , Maslova O V , Efremenko E N 
Published: May 2020

Abstract
The effective use of such an analytical indicator as the concentration of intracellular adenosine triphosphate (ATP) in the process of anaerobic transformation of sulfones was shown. The bioluminescent method for determining ATP evaluates to quickly evaluate the state of biocatalysts in such processes, to select the conditions for effective conducted of biotechnological processes and the functioning of cells, as well as media compositions used in the conversion of sulfur-containing compounds.
Study of high-frequency magnetic properties of Fe-Ti-B films obtained by magnetron sputtering
Authors: Sheftel E N , Harin E V , Tedzhetov V A , Sh Usmanova G , Bobrovskii S Y , Rozanov K N , Zezyulina P A , Kiryukhantsev-Korneev Ph V 
Published: May 2020

Abstract
The Fe-Ti-B films were obtained by dc magnetron sputtering of the Fe + 15% TiB2 and Fe + 30% TiB2 targets. The chemical composition and structure were studied in the as-sputtered state and after vacuum annealing at 500°C. The static (saturation magnetization Ms
and coercive field Hc
) and rf magnetic properties (magnetic permeability µ’, frequency of natural ferromagnetic resonance fr
and the frequency range in which µ’ is kept) were determined.
Study of the effect of the catalyst on the mechanical properties of RTV grade siloxane
Authors: Tsareva A M , Nasakina E O , Sudarchikova M A , Balashov E P , Baikin A S , Shatova L A , Sevost’yanov M A 
Published: May 2020

Abstract
A RTV grade siloxane film with a different percentage of catalyst was obtained. The mechanical properties of polymer films based on RTV grade siloxane are studied, as well as the effect of K-18 catalyst concentration on thickness, strength and ductility the properties of the obtained films was shown.
The development of the high-strength corrosion resistant austenitic steels for the oil equipment shafts
Authors: Muradyan S O , Muradyan O S , Kostina M V , Kostina V S 
Published: May 2020

Abstract
The work proposes to use corrosion-resistant austenitic Fe-Cr-Mn-Ni-Mo-N steel with a nitrogen content of ∼ 0, 4-0, 9% as a material for the shafts of the oil equipment. The steel was hardened by the solid-solution hardening. Previously, such materials in this area were not used.
Research and development of the inert gas atomization of the wire by means of arc spraying
Authors: Yu Ivannikov A , Kirsankin A A , Kalayda T A , Sevostyanov M A 
Published: May 2020

Abstract
The paper presents brief information on the theory and technology of electric arc wire spraying. The construction for spraying of four groups of wire materials is shown. Carbon and stainless steel, pure copper and titanium wires were atomized. A model of wire atomization during process of electric arc spraying is described.
Formation of Si3Al3O3N5 oxonitride from mixtures of xerogels and silicon and aluminum nitrides in the nitrogen atmosphere
Authors: Ivicheva S N , Klimashin A A , Ovsyannikov N A , Lysenkov A S , Kargin Yu F 
Published: May 2020

Abstract
To obtain silicon and aluminium oxonitrides, the transformations of xerogels and nitrides during firing in a nitrogen atmosphere were studied by thermal and x-ray phase analysis. It was established that the interaction between nitrides and xerogels in a nitrogen atmosphere with the formation of oxonitrides is due to reduction-nitriding reactions. The CO and hydrogen which are formed during the pyrolysis of adsorbed and chemisorbed alcohols (which are the products of the hydrolytic decomposition of silicon and aluminium alkoxides in xerogels) is a reducing agent for the finely dispersed oxides. The effect of the composition of the initial mixtures on the phase composition of the final product (SiAlON) and the morphological features of the powders obtained in one stage of firing in a nitrogen atmosphere is shown.
Properties of composites SiC/SiCf obtained by hot pressing of SHS of silicon carbide powder
Authors: Frolova M G , Lysenkov A S , Titov D D , Istomina E I , Perevislov S N , Kim K A , Zakorzhevsky V V , Fedorov S V , Kargin Yu F 
Published: May 2020

Abstract
Dense ceramic samples based on SiC were obtained by hot pressing. We used the Use of silicon carbide powder as the initial components of SHS, due to the spherical shape of the particles, allows obtaining a denser workpiece. The reinforcing component in the form of silicon carbide fibers is obtained by siliconizing carbon fabric with SiO vapours. The phase composition of SiC fibers obtained by silicification by SiO vapour was determined. The properties of the obtained SiC/SiCf composites were studied: density 3.20 g/cm3, strength 520 MPa (for monolithic ceramics 390 MPa), the value of the crack resistance coefficient 5.9 MPa-m1/2.
Optimization of On-Site Xylanase Production from Aspergillus niger via Central Composite Design (CCD)
Authors: Tarrsini M , Ng Q H , Teoh Y P , Kunasundari B , Ang W U , Shuit S H , Ooi Z X , Hoo P Y 
Published: May 2020

Abstract
Xylanases have stimulated considerable interest due to their potential application in several industries, especially in the bioethanol sector. Since the vitality of this enzyme is undeniable, this research is focused on optimization of on-site xylanase production from Aspergillus niger (A. niger). This initiative could reduce the dependence of commercial xylanase. Central Composite Design (CCD) was implemented in the process of xylanase production optimization. Incubation temperature and medium pH were two parameters selected to statistically optimized using Response Surface Methodology (RSM) in order to improve the xylanase production. From the data analyzed by Design of Experiment (DoE), maximal xylanase production was predicted to produce under condition of 32.67 °C and pH 4.56 with desirability of 0.936. A validation test with triplicate was done to verify the predicted result. The maximum enzyme activity of 0.5638 U/mL was obtained from the validation test.
Overview of the II International Conference “MIP: Engineering-2020: Modernization, Innovations, Progress: Advanced Technologies in Material Science, Mechanical and Automation Engineering”
Authors: Kovalev Igor V , Voroshilova Anna A 
Published: May 2020

Abstract
The overview describes the main directions and results of the II International Conference MIP: Engineering-2020 held in Krasnoyarsk in April 16-18, 2020. It gives the details about the participants and the proceedings.
Design and technology reliability analysis: fork
Authors: Artyushenko A G , Pokhabov Yu P 
Published: May 2020

Abstract
While space system functioning, faults are unacceptable. The price of any early failure in the operation of a spacecraft is much higher than the cost of the development and manufacture of the failed element. Modern verification methods do not provide the required reliability. For the mechanisms of spacecraft, a methodology of design and technology reliability analysis has been developed, which allows one to achieve reliability, which is not available for modern verification methods. The article provides the purpose of the new analysis, the basic foundations and a brief description of the analysis methodology. The technique was tested in the development of space-based mechanisms and hydraulic automation for oil equipment that operate without human intervention once during the service life. The basic approaches to the implementation of the design and technology reliability analysis make it possible to develop many branches (fork version) to solve problems of ensuring the quality and reliability of products for various purposes, increasing the efficiency of development and professional skill of designers.