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Phlogopite in mantle xenoliths and kimberlite from the Grib pipe,Arkhangelsk province,Russia:Evidence for multi-stage mantle metasomatism and origin of phlogopite in kimberlite

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Geoscience Frontiers 2019年第5期10卷 1941-1959页

作者： A.v. Kargin L.v. Sazonova A.A. Nosova N.M. Lebedeva yu.A. Kostitsyn E.v. Kovalchuk v.v. Tretyachenko Ya.S. Tikhomirova Institute of Geology of Ore Deposits PetrographyMineralogyand GeochemistryRussian Academy of Sciences (IGEM RAS)MoscowRussia Lomonosov Moscow State University MoscowRussia vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences MoscowRussia AC ALROSA Research Geological Prospecting Enterprise ArkhangelskRussia

We present petrography and mineral chemistry for both phlogopite,from mantle-derived xenoliths (garnet peridotite,eclogite and clinopyroxene-phlogopite rocks) and for megacryst,macrocryst and groundmass flakes from the Grib kimberlite in the Arkhangelsk diamond province of Russia to provide new insights into multi-stage metasomatism in the subcratonic lithospheric mantle (SCLM) and the origin of phlogopite in *** on the analysed xenoliths,phlogopite is characterized by several *** first generation (Phl1) occurs as coarse,discrete grains within garnet peridotite and eclogite xenoliths and as a rock-forming mineral within clinopyroxene-phlogopite *** second phlogopite generation (Phl2) occurs as rims and outer zones that surround the Phl1 grains and as fine flakes within kimberlite-related veinlets filled with carbonate,serpentine,chlorite and *** garnet peridotite xenoliths,phlogopite occurs as overgrowths surrounding garnet porphyroblasts,within which phlogopite is associated with Cr-spinel and minor *** eclogite xenoliths,phlogopite occasionally associates with carbonate bearing veinlet ***,from the kimberlite,occurs as megacrysts,macrocrysts,microcrysts and fine flakes in the groundmass and matrix of kimberlitic *** phlogopite grains within the kimberlite are characterised by signs of deformation and form partly fragmented grains,which indicates that they are the disintegrated fragments of previously larger ***1,within the garnet peridotite and clinopyroxeneephlogopitexenoliths,is characterised bylow Ti and Cr contents (TiO292) typical of primary peridotite phlogopite in mantle peridotite xenoliths from global kimberlite *** formed during SCLM metasomatism that led to a transformation from garnet peridotite to clinopyroxene-phlogopite rocks and the crystallisation of phlogopite and high-Cr clinopyroxene megacrysts before the

关键词： Mantle metasomatism Kimberlite Phlogopite Mantle xenoliths Megacrysts

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Thermal neutron flux produced by EAS at various altitudes

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Chinese Physics C 2013年第1期37卷 66-69页

作者： yu. v. Stenkin v. v. Alekseenko D. M. Gromushkin 刘烨马欣华赵静 Institute for Nuclear Research of Russian Academy of Sciences Moscow Physical Engineering Institute Hebei Normal University Institute of High Energy Physics of Chinese Academy of Sciences

The results of Monte-Carlo simulations of extensive air showers are presented to show the difference of the hadronic component content at various altitudes with the aim to choose an optimal altitude for a PRISMA-like experiment. The CORSIKA program for EAS simulations with QGSJET and GHEISHA models was used to calculate the number of hadrons reaching the observational level inside a circle of 50 m radius around the EAS axis. Then the number of neutrons produced by the hadronic component was calculated using an empirical relationship between the two components. We have tested the results with the ProtoPRISMA array at sea level, and recorded the neutrons which are consistent with the simulation results.

关键词： EAS detector neutrons altitudes

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Synthetic morphogenesis:why reverse engineering should be prioritized

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Bio-Design and Manufacturing 2021年第2期4卷 429-431页

作者： v.N.Nikolenko M.yu Nikolayev M.Y.Sinelnikov Department of human anatomy first moscow state medical university(sechenov university)moscowrussian federation Department of normal and topographical anatomy lomonosov moscow state universitymoscowrussian federation Institute for regenerative medicine sechenov universitymoscowrussian federation

Dear Editor,In morphogenesis,the sequential execution of tissue arrangement depends on a vast array of signaling proteins and cellular *** mechanisms of such response have been identified:apoptosis,proliferation,fusion,adhesion,sorting,transition,folding,migration and *** combinations of these responses lead to the formation of various anatomical structures[1,2].

关键词： expansion. arrangement sorting

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Enhanced electrochemical CO_(2)reduction coupled with urea oxidation using bifunctional atomically dispersed CuNi catalysts

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Nano Research 2025年第1期18卷 208-216页

作者： Wenjie Wu Haoyang Zhou Ying Liu Yifei Pan Qingqing Chen yu Zhang Junjie Mao Wenjie Ma Ping yu Beijing National Laboratory for Molecular Sciences Key Laboratory of Analytical Chemistry for Living BiosystemsInstitute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China College of Chemistry and Materials Science Anhui Normal UniversityWuhu 241002China University of Chinese Academy of Sciences Beijing 100049China

The electrochemical conversion of carbon dioxide(CO_(2))into chemical fuels represents a promising approach for addressing global carbon balance ***,this process is hindered by the kinetic limitations of anodic reactions,usually the oxygen evolution reaction,resulting in less efficient production of high value-added ***,we report an integrated electrocatalytic system that couples CO_(2)reduction reaction(CO_(2)RR)with urea oxidation reaction(UOR)using a bifunctional electrocatalyst with atomically dispersed dual-metal CuNi sites anchored on bamboo-like nitrogen-doped carbon nanotubes(CuNi-CNT),which were synthesized through a one-step pyrolysis *** bifunctional CuNi-CNT catalyst exhibits a near 100%CO Faraday efficiency for CO_(2)RR over a wide potential range and outstanding UOR performance with a negatively shifted potential of 210 mv at 10 mA·cm^(-2).In addition,we assemble a two-electrode electrolyzer using bifunctional CuNi-CNT-modified carbon fiber paper electrodes as both cathode and anode,capable of operating at a remarkably low cell voltage of 1.81 v at 10 mA·cm-2,significantly lower than conventional *** study provides a novel avenue to achieving an efficient carbon cycle with reduced electric power consumption.

关键词： electrochemical conversion bimetallic site catalyst bifunctional electrocatalyst carbon dioxide reduction urea oxidation

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Abrasive resistance of metastable v–Cr–Mn–Ni spheroidal carbide cast irons using the factorial design method

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International Journal of Minerals,Metallurgy and Materials 2016年第6期23卷 645-657页

作者： v.G.Efremenko K.Shimizu A.P.Cheiliakh T.v.Pastukhova yu.G.Chabak K.Kusumoto Department of Metal Science and Heat Treatments of Metals Pryazovskyi State Technical University Department of Mechanical Aerospace and Materials Engineering Muroran Institute of Technology

Full factorial design was used to evaluate the two-body abrasive resistance of 3wt%C–4wt%Mn–1.5wt%Ni spheroidal carbide cast irons with varying vanadium（5.0wt%–10.0wt%） and chromium（up to 9.0wt%） contents. The alloys were quenched at 920℃. The regression equation of wear rate as a function of v and Cr contents was proposed. This regression equation shows that the wear rate decreases with increasing v content because of the growth of spheroidal vC carbide amount. Cr influences the overall response in a complex manner both by reducing the wear rate owing to eutectic carbides（M7C3） and by increasing the wear rate though stabilizing austenite to deformation-induced martensite transformation. This transformation is recognized as an important factor in increasing the abrasive response of the alloys. By analyzing the regression equation, the optimal content ranges are found to be 7.5wt%–10.0wt% for v and 2.5wt%–4.5wt% for Cr, which corresponds to the alloys containing 9vol%–15vol% spheroidal vC carbides, 8vol%–16vol% M7C3, and a metastable austenite/martensite matrix. The wear resistance is 1.9–2.3 times that of the traditional 12wt% v–13wt% Mn spheroidal carbide cast iron.

关键词： cast irons carbides abrasive resistance factorial design

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Design of self-healing PEO-based protective layers containing in-situ grown LDH loaded with inhibitor on the MA8 magnesium alloy

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Journal of Magnesium and Alloys 2023年第10期11卷 3688-3709页

作者： A.S.Gnedenkov S.L.Sinebryukhov A.D.Nomerovskii v.S.Filonina A.yu.Ustinov S.v.Gnedenkov Institute of Chemistry of FEB RAS 159 Pr.100-letiya VladivostokaVladivostok690022Russia

The high corrosion rate of magnesium and its alloys in chloride-containing solution significantly reduces the potential of this material for diverse ***,the formation of a smart protective coating was achieved in this work to prevent degradation of the MA8 magnesium alloy.A porous ceramic-like matrix was obtained on the material by plasma electrolytic oxidation(PEO).Further surface functionalization was performed using layered double hydroxides(LDH) served as nanocontainers for the corrosion *** methods of LDH intercalation with benzotriazole(BTA) were *** composition and morphology of the formed coating were studied using SEM-EDX analysis,XRD,XPS,and Raman *** corrosion behavior of the coated samples was evaluated using electrochemical impedance spectroscopy and potentiodynamic *** corrosion rate was estimated using volumetry and gravimetry *** formed composite coating provides the Mg alloy with the lowest corrosion activity(|Z|_(f)=0.1 Hz)=8.48·10^(5) Ω·cm^(2),I_(c)=1.4·10^(-8)A/cm^(2),P_(H)=0.21 mm/year) and improves the protective properties of the PEO-coated sample(|Z|_(f)=0.1 Hz)=8.37·10^(3) Ω·cm^(2),I_(c)=4.1·10^(-7)A/cm^(2),P_(H)=0.31 mm/year).The realization of the self-healing effect of the inhibitor-containing LDH/PEO-coated system was studied using localized electrochemical methods(SvET and SIET) with two artificial defects on the surface.A mechanism involving three stages for the active corrosion protection of the alloy was *** findings contribute to the follow-up work of developing modified LDH/PEO-based structures that promote the Mg alloy with high corrosion resistance,superior electrochemical performance for applications in various fields of industry and medicine.

关键词： Magnesium alloy Plasma electrolytic oxidation Layered double hydroxides Corrosion inhibitor Electrochemistry Corrosion rate

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Acoustic emission characterization of sliding wear under condition of direct and inverse transformations in lowtemperature degradation aged Y-TZP and Y-TZP-Al_2O_3

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Friction 2018年第3期6卷 323-340页

作者： Nikolai L SAvCHENKO Andrey v FILIPPOv Sergei yu TARASOv Andrey I DMITRIEv Evgeny v SHILKO Aleksandr S GRIGORIEv Institute of Strength Physics and Materials Science SB RAS National Research Tomsk Polytechnic University National Research Tomsk State University

In this research, results of the investigation of the sliding friction and wear of yttria-stabilized tetragonal zirconia polycrystalline(Y-TZP) and Y-TZP-Al_2O_3 samples preliminarily subjected to low-temperature degradation are reported. The investigation was carried out using a pin-on-disk tribometer with simultaneous recording of acoustic emission(AE) and vibration acceleration. The sliding wear process was found to be determined by dynamic direct and inverse Y-TZP transformations detected by monoclinic and tetragonal X-ray diffraction peak ratios. The AE signals generated under direct and inverse transformations can be used to characterize wear and friction mechanisms as well as direct and inversed sliding-induced phase transformations. The AE signal energy grows with the friction coefficient and the inverse transformation degree. Reduction of the AE signal energy indicates establishing the mild wear stage caused by effective stress-induced direct martensitic transformation. The AE signal median frequency increases in the case of lower friction. Numerical studies of wear subsurface fracture under conditions of stress-induced martensitic transformation were used to elucidate the role played by the phase transformation in Y-TZP and Y-TZP-Al_2O_3. Martensitic transformation in Y-TZP was described with use of the non-associated dilatant plasticity model. Simulation results particularly show that increase in the value of dilatancy coefficient from 0 to 0.2 is accompanied by 25%-30% reduce in characteristic length and penetration depth of sliding-induced subsurface cracks. As shown the AE may be an effective tool for in-situ monitoring the subsurface wear of materials experiencing both direct and inverse transformations.

关键词： zirconia transformation toughening low-temperature degradation friction acoustic emission numerical modeling movable cellular automata method

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Study of laser beam scattering by inhomogeneous ensemble of red blood cells in a shear flow

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Journal of Innovative Optical Health Sciences 2015年第4期8卷 85-96页

作者： S.yu Nikitin A.E.Lugovtsov v.D.Ustinov M.D.Lin A.v.Priezzhev Physics Faculty Lomonosov Moscow State University Moscow Russia International Laser Center Lomonosov Moscow State University MoscowRussia Faculty of Computational Mathematics and Cybernetics Lomonosov Moscow State University Moscow Russia Faculty of Fundamental Medicine Lomonosov Moscow State University Moscow Russia

Laser elktacytometry is a technique widely used for measuring the deformability of red blood cells(erythrocytes)in blood samples in *** ektacytometer,a flow of highly diluted suspension of erythrocytes in variable shear stress conditions is iluninated with a laser beam to obtain a diffraction *** diffraction pattern provides information about the shapes(shear induced elongations)of the cells under *** paper is dedicated to developing the technique of laser ektacytometry s0 that it would enable one to measure the distrilbution of the erythrocytes in *** discuss the problem of calibration of laser elktacytometer and test a novel data processing algorithm allowing to determine the parameters of the distribution of ery-throcytes ***,we examined 12 specimens of blood of rats under the action of 4 shear *** of the data shows that in conditions of a limited range of digitizing the diffraction patterns,the measurement errors for the mean deformability,deform-ability scatter and the skewness of erythrocytes distribution in deformability by our method are respectively 15%,20%and 20%.

关键词： Laser ifractometry ektacytometry shear flow difraction pattern deformability of erythrocytes erythrocytes variance in shapes image analysis

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Photoluminescence properties of Eu3+-doped MgAl2O4 nanoparticles in various surrounding media

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Journal of Rare Earths 2019年第8期37卷 806-811,I0001页

作者： I.E.Kolesnikov E.v.Golyeva E.v.Borisov E.yu Kolesnikov E.Lahderanta A.v.Kurochkin M.D.Mikhailov St.Petersburg State University St.PetersburgRussia Lappeenranta University of Technology LUT LappeenrantaFinland Peter the Great St.Petersburg Polytechnic University St.PetersburgRussia Scientific and Technological Institute of Optical Material Science VNTs S.I.Vavilov State Optical InstituteSt.PetersburgRussia volga State University of Technology Yoshkar-OlaRussia

Eu3+-doped MgAl2O4 nanoparticles were prepared by modified Pechini method.X-ray diffraction analysis shows pure tetragonal spinel phase without any *** average size of synthesized nanoparticles was determined to be about 50-60 nm using scanning electron microscopy and static light scattering *** and excitation spectra as well as lifetimes of MgAl2O4:Eu3+ nanophosphors were explored in surrounding media with different refractive *** medium does not affect luminescence bands position,whereas 5D0 lifetime monotonically decreases along with increase of medium refractive *** of surrounding media on radiative and nonradiative decay rates,which were calculated using 4f-4f intensity theory,was studied and *** factor of prepared nanoparticles is defined using both radiative and observed lifetimes.

关键词： Eu3+ Nanoparticles Filling factor Luminescence Lifetime Rare earths

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Design of Mg-Zn-Si-Ca casting magnesium alloy with high thermal conductivity

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Journal of Magnesium and Alloys 2020年第1期8卷 184-191页

作者： v.E.Bazhenov A.v.Koltygin M.C.Sung S.H.Park A.yu.Titov v.A.Bautin S.v.Matveev M.v.Belov v.D.Belov K.v.Malyutin National University of Science and Technology“MISiS” Leninskiy pr.4Moscow 119049Russia LG Electronics Inc. Yeoui-daeroYeongdeungpo-gu.128LG Twin TowerSeoul 07336 Republic of Korea

Magnesium alloys are commonly used to produce lightweight *** most magnesium alloys exhibit low thermal conductivities,high thermal conductivities are needed for electronic *** this study,we attempted to develop new magnesium casting alloys with high thermal *** Mg-Zn-Si-Ca alloy compositions were chosen using CALPHAD(CALculation of PHAse Diagrams)calculations,and alloy samples were *** fluidity and hot-tearing resistance were *** results indicated that these properties were similar to those of AZ91 *** tests showed that high-pressure die casting could produce Mg-Zn-Si-Ca alloys possessing mechanical properties 1.5-3 times higher than those produced via sand *** alloy thermal conductivity was 126 W/mK at room *** corrosion rates of the as-cast samples in NaCl/water solutions were two times higher than that of AZ91.

关键词： Magnesium alloy Thermal conductivity Phase composition Corrosion rate Sand casting High-pressure die casting

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