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Comparative investigations of structure and properties of micro-arc wollastonite-calcium phosphate coatings on titanium and zirconiumniobium alloy

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Bioactive Materials 2017年第3期2卷 177-184页

作者： M.B.Sedelnikova E.G.komarova Yu.P.Sharkeev T.V.Tolkacheva I.A.khlusov L.S.Litvinova k.a.yurova V.V.Shupletsova Institute of Strength Physics and Materials Science of SB RAS Academicheskii pr.2/4634055TomskRussia National Research Tomsk Polytechnic University Lenina pr.30634050TomskRussia Siberian State Medical University 2 Moskovsky tr.634050TomskRussia Immanuel kant Baltic Federal University 14 A.Nevskogo st.236041KaliningradRussia

Investigation results of micro-arc wollastoniteecalcium phosphate(W-CaP)biocoatings on the pure titanium(Ti)and Zr-1wt.%Nb(Zr-1Nb)alloy were *** voltages of 150-300 V generate the micro-arc oxidation(MAO)process with the initial amplitude current of 150-550 A and 100-350 A for Ti and Zr-1Nb substrates,*** identical dependencies of changes of the coating thickness,surface roughness and adhesion strength on the process voltage were revealed for the both *** W-CaP coatings with the thickness of 10-11μm were formed on Ti and Zr-1Nb under the low process voltage of 130-150 *** wollastonite particles with the size in the range of 40-100μm were observed in such *** structure of the coatings on Ti was presented by the X-ray amorphous and crystalline *** X-ray reflexes relating to the crystalline phases of Ti and wollastonite were observed only in XRD patterns of the coatings deposited under 130-200 V on ***,the crystalline structure with phases of CaZr4(PO4)6,β-ZrP2O7,ZrO2,and Zr was detected in the coatings on ***-IRS,XRD,SEM,and TEM data confirmed that the increase of the process voltage to 300 V leads to the dissociation of the *** toxic effect of specimens on a viability,morphology and motility of human adipose-derived multipotent mesenchymal stem cells was revealed in vitro.

关键词： Micro-arc oxidation Biocoatings Calcium phosphate Wollastonite

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A detailed reconstruction of changes in the factors and parameters of soil erosion over the past 250 years in the forest zone of European Russia(Moscow region)

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International Soil and Water Conservation Research 2022年第1期10卷 149-160页

作者： Andrey Zhidkin Daria Fomicheva Nadezhda Ivanova Tomas Dostal Alla yurova Mikhail komissarov Josef krasa V.V.dokuchaev soil science institute pyzhevskiy pereulok 7moscow119017russian federation Faculty of geography lomonosov moscow state universityleninskie gorygsp-1moscow119991russian federation Department of landscape water conservation faculty of civil engineeringczech technical university in praguethakurova 7prague16629czech republic Ufa institute of biology ufrc russian academy of sciencespr.oktyabrya 69ufa450054russian federation

Accelerated soil erosion is a major threat to soil,and there are great variations in the rate of soil erosion over time due to natural and human-induced *** temperate forest zone of Russia is character-ized by complex stages of land-use history(*** urbanization,agricultural development,land abandonment,etc.).We have for the first time estimated the rates of soil erosion by the WaTEM/SEDEM model(rainfall erosion)and by a regional model(snowmelt erosion)over the past 250 years(from 1780 to 2019)for a 100-km2 study site in the Moscow region of *** calculations were made on the basis of a detailed historical reconstruction of the following factors:the location of the arable land,crop rotation,the rain erosivity factor,and the maximum snow water *** area of arable land has decreased more than 3.5-fold over the past 250 *** the end of the 20th century,the rates of gross erosion had declined more than 5.5-fold(from 28×10^(3) to 5×10^(3) t·ha^(-1)yr^(-1))in comparison with the end of the 18th *** in the boundaries of arable land and also the relief features had led to a significant intra-slope accumulation of *** a result of sediment redeposition within the arable land,the variation in net soil erosion was significantly lower than the variation in gross soil *** changes in arable land area and in crop composition are the factors that have to the greatest extent determined the changes in soil erosion in this territory.

关键词： Anthropogenic soil erosion Soil erosion history Crop rotation Magnetic tracer method WaTEM/SEDEM

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Precise tissue bioengineering and niches of mesenchymal stem cells:Their size and hierarchy matter

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BIOCELL 2022年第6期46卷 1365-1373页

作者： IGOR A.kHLUSOV LARISA S.LITVINOVA kRISTINA A.yurova MARINA Y.kHLUSOVA Department of Morphology and General Pathology Siberian State Medical UniversityTomsk634050Russia Center for Immunology and Cell Biotechnology Immanuel Kant Baltic Federal UniversityKaliningrad236029Russia Department of Pathophysiology Siberian State Medical UniversityTomsk634050Russia

Stem cell microterritories(niches),as a specialized part of the extracellular matrix(ECM),are considered an important target and tool for the development of new materials,medical implants,and ***,tissue bioengineering products that have stem cell niches of known size on the surface or in the bulk structure of artificial materials are practically *** brief review attempts to draw attention to the problematic aspects of niches as specific parts of the ECM,such as their hierarchy and size for mesenchymal stromal/stem cells(MSCs).These parameters arise directly from numerous definitions of stem cell niches as specialized morphological microterritories found in various *** authors of this review analyze the known information on the hierarchy of MSC microterritories by analogy with that of hematopoietic stem *** reports on the size of artificial MSC niches compared to natural niche candidates are summarized.A consensus on a hierarchy and optimal range of niche sizes for MSCs and other stem cells is needed to accelerate the development of prototyping technologies and additive manufacturing in applications to precise tissue bioengineering and regenerative medicine.

关键词： Mesenchymal stromal/stem cells Natural and artificial niches Classification Dimension Matrix features Usefulness

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Changes in hydrological processes in the headwater area of Yellow River,China during 1956-2019 under the influences of climate change,permafrost thaw and dam

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Advances in Climate Change Research 2023年第2期14卷 237-247页

作者： Qiang MA Hui-Jun JIN Qing-Bai WU Alla yurova Si-Hai LIANG Raul DavidȘERBAN Yong-Chao LAN State key Laboratory of Frozen Soils Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China School of Civil Engineering Permafrost InstituteNortheast-China Observatory and Research-Station of Permafrost Geological Environment(Ministry of Education)Institute of Cold-Regions Engineering Science and TechnologyNortheast Forestry UniversityHarbin 150040China School of Water Resources and Environment China University of GeosciencesBeijing 100083China Institute for Alpine Environment Eurac ResearchBolzano 39100Italy

Discharge characteristics are crucial for detecting changes in hydrological ***,the river hydrology)in the Headwater Area of the Yellow River(HAYR)has exhibited erratic regimes(e.g.,monotonously declining/low/high hydrograph,even with normal precipitation)under the effects of climate change,permafrost thaw and changes in dam *** study integrates hydroclimatic variables(air temperature,precipitation,and potential evapotranspiration)with anthropogenic dam operation and permafrost degradation impact data to systematically examine the mechanisms of these hydrological process changes during 1956–*** results show the following:1)compared with the pre-dammed gauged flow,dam construction(January 1998–January 2000)and removal of dam(September 2018–August 2019)induced monotonously low(−17.2 m^(3) s^(−1);−61%)and high(+54.6 m^(3) s^(−1);+138%)hydrographs,respectively;2)hydroclimatic variables mainly controlled the summer–autumn hydrological processes in the HAYR;3)the monotonous decline of the hydrograph of Yellow River in the HAYR in some hydrological years(e.g.,1977,1979,1990 and 1995)was closely related with unusually high atmospheric demands of evaporation and low-intense rainfall during summer–autumn seasons;and 4)the lengthening of subsurface hydrological pathways and residence time,permafrost degradation reduced the recession coefficient(−0.002 per year)of winter flow and altered the hydrological regimes of seasonal rivers,which resulted in flattened hydrographs that reduced and delayed the peak flow(of 0.05 mm per year and 1.65 d per year,respectively)as well as boosted the winter baseflow(0.01 mm per year).This study can provide updated and systematic understanding of changing hydrological processes in typical alpine catchments on northeastern Qinghai–Tibet Plateau,China under a warming climate.

关键词： Degradation of alpine permafrost Dam Changing hydrological processes Precipitation Streamflow Evaporation

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Research on Russia, China and the U.S. Outer Space Policy

Research on Russia, China and the U.S. Outer Space Policy

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作者： yurova ELENA 华中师范大学

学位级别：硕士

本研究以俄罗斯、中国和美国为案例试图对这些国家太空政策、其政策对国际国内局势和对这些国家发展的影响进行比较。太空探索最近的趋势已为国家间在此方面中的合作增加兴趣,而令人吃惊的不成功发射很高百分率表示太空政策质量监测的... 详细信息

本研究以俄罗斯、中国和美国为案例试图对这些国家太空政策、其政策对国际国内局势和对这些国家发展的影响进行比较。太空探索最近的趋势已为国家间在此方面中的合作增加兴趣,而令人吃惊的不成功发射很高百分率表示太空政策质量监测的重要性。因此,本研究旨在探讨在三个国家的太空政策的异同,分析其对全球形势的影响,找出问题,并试图找办法来解决这些问题。

关键词：太空政策俄罗斯中国美国太空

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