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Protective Composite Coatings Formed on Mg Alloy Surface by PEO Using Organofluorine Materials

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Journal of Materials Science & Technology 2017年第7期33卷 661-667页

作者： Dmitry V. Mashtalyar Konstantine V. Nadaraia sergey L. Sinebryukhov sergey V. Gnedenkov Institute of Chemistry Far Eastern BranchRussian Academy of SciencesVladivostok 690022Russia Far Eastern Federal University Vladivostok 690950Russia

The results of the surface modification of magnesium alloys by plasma electrolytic oxidation（PEO） and subsequent treatment in suspension of the superdispersed polytetrafluoroethylene（SPTFE） or telomeric solution of tetrafluoroethylene（TFE） are presented. Composite coatings have been obtained by dipping with subsequent heat treatment. Electrochemical, tribological properties and wettability of protective composite coatings have been investigated. Composite coatings formed on PEO-layer by fourfold treatment of samples in SPTFE suspension possess best protective properties. The obtained coatings decrease the corrosion current density（5.4 × 10^（-11） A cm^（-2）） and wear（7.6 × 10^（-7）mm^3（Nm）^（-1））, and increase the polarisation resistance（1.7 × 10~9 cm^2） and impedance modulus（1.9 × 10~9 cm^2） by orders of magnitude in comparison with unprotected magnesium alloy and base PEO-coating. The highest value of contact angle（CA） has been obtained for coatings with triple application in telomeric solution. CA for such composite coatings attains（171 ± 2）？, as the result of multimodal roughness of the composite coating＇s surface.

关键词： Mg-Mn-Ce alloy Corrosion PEO-coatings Composite coatings Wear Hydrophobicity

Forestry activity is one mechanism of invasion by arboreal plants

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Journal of Arid Land 2013年第4期5卷 434-438页

作者： Gulnara SITPAEVA sergey CHEKALIN The Institute of Botany and Phytointroduction Committee of ScienceMinistry of Education and ScienceAlmaty 050060Kazakhstan

For a long time,forestry primarily had industrial *** of wood production was the main criterion of forestry efficacy,and thus rapid-growing arboreal species were cultivated in natural *** recently,nature protection has become one of forestry＇s ***,some introduced,rapid-growing species became aggressive components of natural ecological systems during the *** this paper,we first describe a method that we developed to categorize aggressiveness of invasive arboreal plants in natural forest ecosystems of *** then apply this new scheme to monitoring data of invasive arboreal plants to provide an insight into the invasion potential of different species in the fruit forests of Southeast Kazakhstan.

关键词： forest ecosystems aggressiveness invasive arboreal plants

Use of nanoscale metals in poultry diet as a mineral feed additive

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Animal Nutrition 2020年第2期6卷 185-191页

作者： Еlena Sizova sergey Miroshnikov Svyatoslav Lebedev Boris Usha sergey Shabunin Federal Research Centre of Biological Systems and Agrotechnologies of the Russian Academy of Sciences Orenburg460000Russia Orenburg State University Orenburg460018Russia Moscow State University of Food Production Moscow125080Russia Federal State Budget Scientific Institute(All-Russian Veterinary Research Institute of Pathology Pharmacology and Therapy)Voronezh394087Russia

The research was aimed at studying the efficiency of a nanoscale alloy of copper(Cu) and zinc(Zn) to be used as a mineral additive for feeding broiler chickens,compared to inorganic and organic forms of these *** studies of the blood serum were performed using an automated *** mineral composition was determined by atomic emission and mass spectrometry(MS-ISP),The study was performed on broiler chickens of cross Smena 7(n=72) in the conditions of a *** were3 treatment groups with 24 chickens in *** the inorganic form of mineral supplements with the nanosized alloy resulted in a positive productive effect,with a tendency to increasing the content of serum *** nano scale form of metals improved(P <0.05) the activity of *** the same time,the liver micro structure of experimental groups is similar to that of the *** was a moderate plethora and poor polymorphoncellular infiltration around the interlobular triads with a clear morphological orga nization of the stromal and parenchymal co mponents of the ***,the lack of oxidative stress was confirmed by the dynamics of catalase(CT),total superoxide dismutase(TSOD) and malondialdehyde(MDA) levels,and the concentrations of which did not exceed the reference level Replacing Cu and Zn sulfates with the nanoscale alloy(group 1) and organic form(group 2) of these elements in the diet of broiler chickens was accompanied by the increasing pool of these elements in the organisms at the end of the *** was accumulated throughout the experiment in experimental group 1,compared to the reference,with the maximum difference in the liver of 36.5%(P ≤ 0.05),in the feathers 2.5 times(P ≤ 0.01).Assessment of the Zn level dynamics in the feathers revealed a well noticeable tendency to reducing its concentrations during the experiment in all *** the background of feeding a nanoscale alloy,Zn concentration in the liver exceeded th

关键词： Broiler chicken Feeding Mineral supplement Nanoscale metal

Growth rate of CO_(2) hydrate film on water-oil and water-gaseous CO_(2) interface

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Chinese Journal of Chemical Engineering 2023年第4期56卷 266-272页

作者： Tatyana P.Adamova sergey S.Skiba Andrey Yu.Manakov sergey Y.Misyura Kutateladze Institute of Thermophysics SB RAS Lavrentiev Ave.1Novosibirsk 630090Russian Federation

It is known that injection of carbon dioxide into the petroleum reservoir(CO_(2) flooding) is one of the effective methods for enhanced oil recovery. CO_(2) flooding may be complicated by formation of CO_(2) hydrate plugs. It makes topical investigation of CO_(2) hydrate formation in the system gaseous CO_(2)-oil-water. In this work, the growth rates of carbon dioxide hydrate films at the water-oil as well as the water-gas interface are studied in the pressure range of 2.30-3.04 MPa and at temperatures between -5.4 and 5.0℃. It is found that the growth rate for the water-oil interface is 3.5 times lower than that for the water-gas interface with carbon dioxide. It is hypothesised that the observed decrease in the growth rate is related to the mechanical resistance of the oil components adsorbed on the interface to the growth of the hydrate film. The growth rate of the film has been shown to depend on the experimental procedure,most likely due to the different initial concentrations of carbon dioxide in the aqueous solutions.

关键词： Gas hydrate Oil Carbon dioxide Growth rate Hydrate film

Mathematical Modeling of Heat Transfer Processes of Coal Waste Combustion in a Chamber of Automated Energy Generating Complex

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Journal of Thermal Science 2013年第2期22卷 174-179页

作者： sergey P. Mochalov sergey N. Kalashnikov Pavel S. Mochalov Guolin Song Guoyi Tang Siberian State Industrial University Advanced Materials Institute Graduate School at ShenzhenTsinghua University

The automated energy generating complex allows obtaining heat energy from waste coal-water slurry fuel （WCF） that is a mixture of fine coal particles from coal enrichment wastes with water. The mixture is blown into the swirl chamber under the pressure through the special sprayers. The received heat energy is used in different ways. One of the important issues is to estimate the heat losses through the walls of this chamber. In this paper we solved the boundary problem of mathematical physics to estimate the temperature fields in the walls of the swirl chamber. The obtained solution allows us to estimate the heat losses through the waUs of the swid chamber. The task of the mathematical physics has been solved by a numerical finite-difference method. The method for solving this prob- lem can be used in the calculation of temperature fields and evaluation of heat losses in other thermal power units.

关键词： heat transfer heat conduction equation boundary conditions the heat transfer coefficient tempera-ture distribution.

Method of Relaxation Rates Measurement in Proton-Containing Materials

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Journal of Electronic Science and Technology 2020年第1期18卷 10-18页

作者： sergey Ermak Vladimir Semenov Roman Lozov Institute of Physics Nanotechnology and TelecommunicationsPeter the Great St.Petersburg Polytechnic UniversitySt.Petersburg 195251

A method of the relaxation time measurement in a flowing sample, based on the comparison of the amplitudes of nuclear magnetic resonance(NMR) signals observed from the reference and tested flowing samples was represented. The inductive and optical methods of NMR signal detection in the flowing sample were *** levels of NMR signal(10000 Hz-1/2) and the Hanle magnetometers signal-to-noise ratio(3500 Hz-1/2) were calculated and the possibility of the NMR signal detection with the small-size Hanle magnetometer was demonstrated. Additionally, the absence of a magnet-analyzer and the ability to measure both longitudinal and transverse relaxation time with high accuracy was demonstrated.

关键词： Hanle effect magnetic field nuclear magnetic resonance(NMR) quantum magnetometer relaxation time

Local inflammatory response to gastroesophageal reflux:Association of gene expression of inflammatory cytokines with esophageal multichannel intraluminal impedance-pH data

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World Journal of Clinical Cases 2022年第26期10卷 9254-9263页

作者： sergey Morozov Tatyana Sentsova Department of Gastroenterology Hepatology and NutritionFederal Research Center of NutritionBiotechnology and Food SafetyMoscow 115446Russia Department of Hospital Pediatrics No.2 Russian National Research Medical University named after N.I.PirogovMoscow 117997Russia

BACKGROUND Gene expression of inflammatory cytokines may take part in the pathophysiology of different forms of gastroesophageal reflux disease(GERD).AIM To explore gene expression of inflammatory cytokines in esophageal mucosa in patients with erosive esophagitis(EE)and non-erosive forms of GERD(NERD)and its association with data of esophageal multichannel intraluminal impedancepH(MII-pH)*** This was a single-center prospective *** mucosa samples were taken from the lower part of the esophagus during *** of interleukin(IL)-1β,IL-10,IL-18,tumor necrosis factorα(TNFA),toll-like receptor 4(TLR4),GATA binding protein 3(GATA3),differentiation cluster 68(CD68)andβ-2 microglobulin genes in esophageal mucosa was assessed with ImmunoQuantex ***-pH measurements were performed on all the *** of GERD was confirmed by the results of the MII-pH *** on the endoscopy,patients were allocated to the groups of EE and *** control group consisted of non-symptomatic subjects with normal endoscopy and MII-pH *** used nonparametric statistics to compare the differences between the *** of expression of the mentioned genes with the results of the MII-pH data was assessed with Spearman’s rank *** Data from 60 patients with GERD and 10 subjects of the control group were available for the *** expression of IL-18(5.89±0.4 vs 5.28±1.1,P=0.04)and GATA3(2.92±0.86 vs 2.23±0.96,P=0.03)was found in the EE group compared to *** of IL-1β,IL-18,TNFA,and TLR4 was lower(P<0.05)in the control group compared to EE and *** acid exposure correlated with the expression of IL-1β(Spearman’s rank r=0.29),IL-18(r=0.31),TNFA(r=0.35),GATA3(r=0.34),TLR4(r=0.29),and CD68(r=0.37).Mean esophagealрНcorrelated inversely with the expression of IL-18,TNFA,GATA3,TLR4,and *** association of gene expression with the number of gastroesophageal refluxes was ***

关键词： Gastroesophageal reflux disease Gene expression Cytokines Erosive esophagitis Non-erosive gastroesophageal reflux disease Esophageal multichannel intraluminal impedance-pH Gastroesophageal reflux

Influence of Features of Interphase Boundaries on Mechanical Properties and Fracture Pattern in Metal-Ceramic Composites

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Journal of Materials Science & Technology 2013年第11期29卷 1025-1034页

作者： sergey Psakhie Vladimir Ovcharenko Baohai Yu Evgeny Shilko sergey Astafurov Yury Ivanov Alexey Byeli Alexey Mokhovikov Institute of Strength Physics and Materials Science Siberian Branch of the Russian Academy of Sciences Institute of High Technology Physics Tomsk Polytechnic University Shenyang National Laboratory for Materials Science Institute of High Current Electronics Siberian Branch of the Russian Academy of Sciences Physical-Technical Institute Yurga Technological Institute Tomsk Polytechnic University

The results of a theoretical study on the influence of strength of interphase boundaries in metal-ceramic composite on macroscopical characteristics of composite response such as strength, deformation capacity, fracture energy and fracture pattern are presented. The study was conducted by means of computer-aided simulation by means of movable cellular automaton method taking account of a developed ＂mesoscopical＂ structural model of particle-reinforced composite. The strength of interphase boundaries is found to be a key structural factor determining not only the strength properties of metal-ceramic composite, but also the pattern and rate of fracture. The principles for achievement of the high-strength values of particle/binder interfaces in the metal-ceramic composition due to the formation of the wide transition zones （areas of variable chemical composition） at the interphase boundaries are discussed. Simulation results confirm that such transition zones provide a change in fracture mechanism and make the achievement of a high-strength and a high deformation capacity of metal-ceramic composite possible.

关键词： Metal--ceramic composites Particle-reinforced composite Interphase boundaries Discrete element based analysis Strength and fracture energy Fracture pattern

S-shaped growth curves in fermentations and golden ratio

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International Journal of Biomathematics 2020年第3期13卷 107-136页

作者： sergey P.Klykov Fermentation Expert Poste RestanteObolensk Serpukhov DistrictMoscow RegionRussia142279

A model of the growth curve of microorganisms was proposed,which reveals a relation-ship with the number of a‘golden section’,1.618…,for main parameters of the growth *** treatment mainly concerns the ratio of the maximum asymptotic value of biomass in the phase of slow growth to the real value of biomass accumulation at the end of exponential growth,which is equal to thc square of the'golden section',i.e.,*** are a few relevant theorems to explain these ***,yet simpler,methods were considered for deterrmining the model parameters based on hyperbolic functions.A comparison was made with one of the alternative models to demonstrate the advantage of the proposed *** proposed model should be useful to apply at various stages of fermentation in scientific and industrial ***,the model could give a new impetus to the development of new mathematical knowledge regarding the algebra of the‘golden section'as a whole,as well as in connection with the introduction of a new equation at decomposing of any roots with any degrees for differences between constants and/or variables.

关键词： Golden section golden ratio modeling fermentation S-shaped curves oxy-gen restriction cells numbers theory