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growth of carbon nanotube arrays on various CtxMey alloy films by chemical vapour deposition method

Journal of Materials Science & Technology 2018年第3期34卷 472-480页

作者： Pawel Mierczynski Sergey V.Dubkov Sergey V.Bulyarskii Alexander A.Pavlov Sergey N.Skorik Alexey Yu Trifonov Agnieszka Mierczynska Eugene P.Kitsyuk Sergey A.gavrilov Tomasz P.Maniecki dmitry g.gromov Institute of general and Ecological Chemistry Lodz University of TechnologyZeromskiego 116Lodz 90-924Poland National Research University of Electronic Technology Shokin SquareZelenogradMoscow 124498Russia Institute of Nanotechnology of Microelectronics of the RAS INMEMoscow 11-9991Russia Scientific-Manufacturing Complex'Technological Center' ZelenogradMoscow 124498Russia Scientific Research Institute of Physical Problems named after F V.Lukin Proezd 4806.6ZelenogradMoscow 124460Russia The Australian Wine Research Institute Waite PrecinctHartley Grove cnr Paratoo RoadUrrbrae AdelaideSA 5064Australia

Carbon nanotube （CNT） arrays were fabricated on Ct-Me-N-（O） alloys with content of Ct in the range of 6-40 at.% by chemical vapour deposition. The Ct was a catalytic metal from the group of the following elements： Ni, Co, Fe, Pd, while Me was a transition metal from the group of IV-VII of the periodic table （where Me=Ti, V, Cr, Zr, Nb, Mo, Ta, W, Re）. Carbon nanotubes were found to grow efficiently on the alloy surface with its composition containing Ti, V, Cr, Zr, Hf, Nb or Ta. The growth of CNTs was not observed when the alloy contained W or Re. Additions of oxygen and nitrogen in the alloy facilitated the formation of oxynitrides and catalyst extrusion on the alloy surface. Replacement of the metals in alloy composition affected the diameter of the resulting CNTs. The obtained results showed that the alloy films of varying thickness （10-500 nm） may be used for the CNTs growth. The resulting CNT material was highly homogenous and its synthesis reproducible.

关键词： Carbon nanotubes Amorphous alloys Chemical vapour deposition Catalytic processes Thin films

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Variations in defect substructure and fracture surface of commercially pure aluminum under creep in weak magnetic field

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Chinese Physics B 2017年第12期26卷 427-431页

作者： Sergey Konovalov dmitry Zagulyaev 陈希章 Victor gromov Yurii Ivanov Samara National Research University Samara 443086 Russia Wenzhou University Wenzhou 325035 China Siberian State Industrial University Novokuznetsk 654007 Russia Institute of High Current Electronics of the Siberian Branch of the Russia Academy of Sciences Tomsk 634055 Russia

Commercially pure polycrystalline aluminum of grade A85, as a test material, is investigated. Using scanning and transmission electron microscopy the aluminum fine structure and fracture surface are analyzed. Fractures are studied in the regime of creep with and without a simultaneous effect of 0.3-T magnetic field. It is found that the application of a magnetic field in a linear stage of creep leads to substructure imperfection increasing. Furthermore, the magnetic field effect on aluminum in the process of creep causes the average scalar density of dislocations to increase and induces the process of dislocation loop formation to strengthen. Fractographic investigation of the fracture surface shows that in the fibrous fracture zone the average size of plastic fracture pits decreases more than twice under creep in the condition of external magnetic field compared with in the conventional experimental condition. In a shear zone, the magnetic field causes the average size of fracture pits to decrease. Experimental data obtained in the research allow us to conclude that the magnetic field effect on aluminum in the process of creep leads to the fracture toughness value of the material decreasing, which will affect the state of defect substructure of the volume and surface layer of the material. The influence of the magnetic field is analyzed on the basis of the magneto-plasticity effect.

关键词： aluminum magnetic field creep structure

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Laboratory investigation of a new scale inhibitor for preventing calcium carbonate precipitation in oil reservoirs and production equipment

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Petroleum Science 2016年第2期13卷 320-327页

作者： Azizollah Khormali dmitry g.Petrakov Department of Oil and gas Field Development and Operation Oil and Gas FacultyNational Mineral Resources University(Mining University)

The formation of mineral scale is a complex problem during the oilfield operations. Scale inhibitors are widely used to prevent salt precipitation within reservoirs, in downhole equipment, and in production facilities. The scale inhibitors not only must have high effectiveness to prevent scale formation, but also have good adsorption- desorption characteristics, which determine the operation duration of the scale inhibitors. This work is focused on the development of a new scale inhibitor for preventing cal- cium carbonate formation in three different synthetic for- mation waters. Scale inhibition efficiency, optical density of the solution, induction time of calcium carbonate for- mation, corrosion activity, and adsorption-desorption ability were investigated for the developed scale inhibitor. The optimum concentration of hydrochloric acid in the inhibitor was determined by surface tension measurement on the boundary layer between oil and the aqueous scale inhibitor solution. The results show that the optimum mass percentage of 5 % hydrochloric acid solution in the inhi- bitor was in the range of 8 % to 10 %. The new scale inhibitor had high efficiency at a concentration of 30 mg/L. The results indicate that the induction period for calcium carbonate nucleation in the presence of the new inhibitor was about 3.5 times longer than the value in the absence of the inhibitors. During the desorption process at reservoir conditions, the number of pore volumes injected into the carbonate core for the developed inhibitor was significantly greater than the volume of a tested industrial inhibitor, showing better adsorption/desorption capacity.

关键词： Scale inhibitor Desorption Corrosionactivity - Precipitation Optical density

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Soil respiration in paludified forests of European Russia

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Journal of Forestry Research 2020年第5期31卷 1939-1948页

作者： dmitry Ivanov Fedor Tatarinov Julia Kurbatova A.N.Severtsov Institute of Ecology and Evolution RAS Leninsky Prospekt 33MoscowRussia 119071 Weizmann Institute of Science Herzl St 23476100 RehovotIsrael

Soil respiration studies in paludified forests of the European part of Russia are quite rare in comparison with those of open peat bogs,which make long-term observations in this region highly *** this study,soil CO2 emissions were measured by the close chamber method in different microlandscapes of paludified *** four summer seasons with different environments,soil respiration ranged from 1078 to 248 mg CO2 m^-2 h^-1 in a paludified spruce forest site with coarse woody debris to 659–820 mg CO2 m^-2 h^-1 in a paludified boggy pine *** most intensive soil respiration was observed during the hot summer of 2013 and the lowest in the hot and humid summer of *** total soil CO2 emissions in paludified forests in 2015–2016 were approximately 2000–3000 g CO2 *** the year,the lowest CO2 emission values were observed from November to April(14–84 mg CO2 m^-2 h^-1)and the maximum were in July and August(522–1205 mg CO2 m^-2 h^-1).The contributions of CO2 emissions in the cold November–April period were 6–8.5%.The impacts of temperature on soil respiration were higher(r2=0.45–0.57)than those of groundwater levels(r^2=0.17–0.49).Soil respiration in the paludified spruce forest and in the pine bog generally were higher than emissions from ecosystems with similar hydrothermal conditions in the boreal zone.

关键词： Carbon flux Chamber measurements CO2 emission Peatlands Southern taiga

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First record of Cercidiphylloxylon (Cercidiphyllaceae) from the Palaeocene of Fushun,NE China

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Journal of Systematics and Evolution 2010年第4期48卷 302-308页

作者： dmitry gROMYKO Albert g.ABLAEV Department of Palaeobotany Komarov Botanical InstituteRussian Academy of Sciences V.I.Il'ichev Pacific Oceanological Institute Far Eastern BranchRussian Academy of Sciences

Cercidiphylloxylon spenceri(Brett)Pearson is described from the Lizigou Formation,Palaeocene in *** growth rings are distinct;pores are diffuse,solitary,with somewhat angular outlines in cross section;vessel elements long with long scalariform perforation plates;intervessel pitting is opposite to scalariform;fibertracheids are present;axial parenchyma is scarce;rays are mostly biseriate and *** wood characters of the fossil specimen fall into the range of those of extant Cercidiphyllum(Cercidiphyllaceae).The finding is one of the earliest fossil wood records of Cercidiphyllaceae.

关键词： Cercidiphylloxylon Cercidiphyllum fossil wood Fushun Palaeocene

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Orbits of Real Semisimple Lie groups on Real Loci of Complex Symmetric Spaces

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Acta Mathematica Sinica,English Series 2018年第3期34卷 439-453页

作者： Stéphanie CUPIT-FOUTOU dmitry A.TIMASHEV Ruhr-Universitat Bochum Fakultat fiir Mathematik D-44780 Bochum Germany Lomonosov Moscow State University Faculty of Mechanics and Mathematics Department of Higher Algebra 119991 Moscow Russia

Let g be a complex semisimple algebraic group and X be a complex symmetric homogeneous g-variety. Assume that both g, X as well as the g-action on X are defined over real *** g（R） acts on X（R） with finitely many orbits. We describe these orbits in combinatorial terms using galois cohomology, thus providing a patch to a result of Borel and Ji.

关键词： Semisimple group symmetric space real point orbit galois cohomology

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Modeling of cold-temperate tree Pinus koraiensis (Pinaceae) distribution in the Asia-Pacific region: Climate change impact

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Forest Ecosystems 2022年第2期9卷 160-167页

作者： Tatyana Y.Petrenko Kirill A.Korznikov dmitry E.Kislov Nadezhda g.Belyaeva Pavel V.Krestov Botanical garden-Institute FEB RAS Makovskogo St.142Vladivostok690024Russia Institute of geography RAS Staromonetniy 24-4Moscow119017Russia

Background:Pinus koraiensis Siebold&Zucc.(Korean pine)is a key species of the mixed cold temperate forests of Northeast *** climate change can significantly worsen the quality of *** habitats and therefore lead to a large-scale structural and functional transformation of the East Asian mixed *** built a species distribution model(SDM)for *** using the random forest classifier–a versatile machine learning al-gorithm,to discover overlap areas of potential species occurrence in the climate condition of the Last glacial Maximum(~21,000 year before present)and in the projected future climates(2070 year),from which possible permanent refugia for *** were ***:Using the random forest supervised learning algorithm,we developed models of the modern distribution of *** in accordance with the five selected bioclimatic variables(Kira’s warmth and coldness indices,the index of continentality,the rain precipitation index,and the snow precipitation index).In addition to current climatic conditions,we performed this analysis for the climate of the Last glacial Maximum and for the future projected climate(2070)under scenarios RCP2.6 and *** the predictors,the rain index appears to be the most *** land area estimates with high suitability for *** was 303,785 km 2 under current climatic conditions,586,499 km 2 for the Last glacial Maximum,and 337,573 km^(2) for the future(2070)period under the RCP2.6 scenario,and 397,764 km^(2) under the RCP8.5 ***:Most of the potential range of *** during the Last glacial Maximum was located outside the current distribution area of the *** climatically suitable *** habitats will likely disappear in the western part of its modern *** the southern part of the range,which includes glacial refugia,the areas of continuous distribution of the *** populations since the end of the Pleistocene are expected to

关键词： Climate change Bioclimatic modeling Species distribution model Korean pine Northeast Asia

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Performance of Pr_(2)(Ni,Cu)O_(4+δ) electrodes in protonic ceramic electrochemical cells with unseparated and separated gas spaces

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Journal of Materials Science & Technology 2021年第34期93卷 157-168页

作者： Artem P.Tarutin Yulia g.Lyagaeva Aleksey I.Vylkov Maxim Yu.gorshkov gennady K.Vdovin dmitry A.Medvedev Laboratory of Electrochemical Devices Based on Solid Oxide Proton Electrolytes Institute of High Temperature ElectrochemistryYekaterinburg 620137Russia Ural Federal University Yekaterinburg 620002Russia

The Ln_(2)NiO_(4+δ)-based layered phases have attracted much attention as components for high-performance protonic ceramic fuel cells(PCFCs)and electrolysis cells(PCECs)enabling energy conversion with good efficiency and low *** present paper aims at rationally engineering the Cu-doped Pr_(2)NiO_(4+δ)materials and analysing their electrode behaviour for reversible protonic ceramic cells operating in both PCFC and PCEC *** oxides of Pr_(2)Ni_(1-x)CuxO_(4+δ)(x=0,0.1,0.2 and 0.3)were synthesised using the citrate-nitrate *** obtained materials were characterised considering their crystalline structures,as well as thermal,thermomechanical and electrotransport properties.A special interest was focused on the quality of an electrode/electrolyte interface governing the electrochemical performance of the cells *** is shown that a copper doping of x=0.2 has a positive impact on the thermomechanical compatibility of the Ba(Ce,Zr)O_(3)-based electrolytes,providing a better adhesion to these electrolytes at low-temperature sintering and resulting in a decrease of the polarisation resistance of the air electrodes.A reversible protonic ceramic cell demonstrates a power density of~340 m W cm^(-2) and a hydrogen output flux of~3.8 ml cm^(-2) min^(-1) at 750℃.The presented results propose modernised alkaline-earth-element-free and cobalt-free electrodes that can be successfully used in the electrochemical cells based on the-state-of-the-art proton-conducting electrolytes.

关键词： rSOC Proton conductivity Cathode Cu-doping Thermal expansion Impedance spectroscopy

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Leucine-rich repeat-containing g protein-coupled receptor 5 marks different cancer stem cell compartments in human Caco-2 and LoVo colon cancer lines

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World Journal of gastroenterology 2021年第15期27卷 1578-1594页

作者： Samah Abdulaali Alharbi dmitry A Ovchinnikov Ernst Wolvetang Physiology Department College of MedicineUmm Al-Qura UniversityMakkah 24231Saudi Arabia Department of Stem Cell Engineering group Australian Institute for Bioengineering and NanotechnologyThe University of QueenslandBrisbane 4072QLDAustralia Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbane 4072QLDAustralia

BACKgROUND Colon cancer cell lines are widely used for research and for the screening of drugs that specifically target the stem cell compartment of colon *** was reported that colon cancer carcinoma specimens contain a subset of leucine-rich repeatcontaining g protein-coupled receptor 5(LgR5)-expressing stem cells,these socalled“tumour-initiating”cells,reminiscent in their properties of the normal intestinal stem cells(ISCs),may explain the apparent heterogeneity of colon cancer cell ***,colon cancer is initiated by aberrant Wnt signaling in ISCs known to express high levels of ***,in vivo reports demonstrate the clonal expansion of intestinal adenomas from a single LgR5-expressing *** To investigate whether colon cancer cell lines contain cancer stem cells and to characterize these putative cancer stem *** A portable fluorescent reporter construct based on a conserved fragment of the LgR5 promoter was used to isolate the cell compartments expressing different levels of LgR5 in two widely used colon cancer cell lines(Caco-2 and LoVo).These cells were then characterized according to their proliferation capacity,gene expression signatures of ISC markers,and their tumorigenic properties in vivo and in *** The data revealed that the LgR5 reporter can be used to identify and isolate a classical intestinal crypt stem cell-like population from the Caco-2,but not from the LoVo,cell lines,in which the cancer stem cell population is more akin to B lymphoma Moloney murine leukemia virus insertion region 1 homolog(+4 crypt)stem *** sub-population within Caco-2 cells exhibits an intestinal cancer stem cell gene expression signature and can both self-renew and generate differentiated LgR5 negative *** data also show that cells expressing high levels of LgR5/enhanced yellow fluorescent protein(EYFP)from this cell line exhibit tumorigenic-like properties in vivo and in *** contrast,cell compartments of LoVo th

关键词： Colorectal cancer Colon cancer cell lines Intestinal stem cell Cancer stem cell Leucine-rich repeat-containing g protein-coupled receptor 5 Heterogenicity

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Discrimination of ventricular tachycardia and localization of its exit site using surface electrocardiography

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Journal of geriatric Cardiology 2019年第4期16卷 362-377页

作者： Heber Ivan Condori Leandro dmitry S Lebedev Evgeny N Mikhaylov Lang g.F. department of Internal Medicine Pavlov First Saint Petersburg State Medical UniversitySaint-PetersburgRussia Almazov National Medical Research Centre Saint-PetersburgRussia Department of Medical and Biotechnology Systems First Electrotechnical UniversitySaint-PetersburgRussia

Differential diagnosis of supraventricular tachycardia (SVT) and ventricular tachycardia (VT) is of paramount importance for appropriate patient management. Several diagnostic algorithms for discrimination of VT and SVT based on surface electrocardiogram (ECg) analysis have been proposed. Following established diagnosis of VT,a specific origination tachycardia site can be supposed according to QRS complex characteristics. This review aims to cover comprehensive and comparative description of the main VT diagnostic algorithms and to present ECg characteristics which permit to suggest the most common VT origination sites.

关键词： Arrhythmias Electrocardiogram Supraventricular Tachycardia Ventricular

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