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Reactive SPS of Al_(2)O_(3)–RE:YAG(RE=Ce;Ce+Gd)composite ceramic phosphors

Journal of Advanced Ceramics 2023年第5期12卷 1015-1032页

作者： Denis Yu.Kosyanov Anastasia A.Vornovskikh Oleg O.Shichalin Evgeniy K.Papynov Anton A.Belov aleksandra A.Kosianova aleksandr N.Fedorets Andrei A.Leonov Alexey P.Zavjalov Sergey A.Tikhonov Yanbin Wang Ziqiu Cheng Xin Liu Jiang Li Far Eastern Federal University Vladivostok 690922Russia Institute of Automation and Control Processes Far Eastern Branch of the Russian Academy of SciencesVladivostok 690041Russia Laboratory of Methods of Synchrotron Radiation Institute of Solid State Chemistry and MechanochemistrySiberian Branch of the Russian Academy of SciencesNovosibirsk 630128Russia Kamchatka Branch of Geophysical Survey of the Russian Academy of Sciences Petropavlovsk-Kamchatsky 683006Russia Key Laboratory of Transparent Opto-functional Inorganic Materials Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Ultrafine-grained Al_(2)O_(3)–rare earth:yttrium aluminium garnet(Al_(2)O_(3)–RE:YAG)(RE=Ce;Ce+Gd)composite ceramics were obtained for the first time by reactive spark plasma sintering(SPS)using commercially available initial oxide *** effect of key sintering parameters(temperature,dwell time,and external pressure(P_(load)))on densification peculiarities,structural-phase states,and luminescent properties of composites was studied *** in phase formation and densification between Ce-doped and Ce,Gd-codoped systems were *** of reactive SPS,at which there is partial melting with the formation of near-eutectic zones of the Al_(2)O_(3)–YAG system/coexistence of several variations of the YAG-type phase,were *** corundum–garnet biphasic ceramics with an optimal balance between microstructural and luminescence performance were synthesized at 1425℃/30 min/30–60 *** external quantum efficiency(EQE)of the phosphor converters reached 80.7%and 72%with close lifetime of~63.8 ns,similar to those of commercial Ce:YAG materials,which is promising for further applications in the field of high-power white light-emitting diodes(WLEDs)and laser diodes(LDs).

关键词： alumina–Ce^(3+)-doped yttrium aluminium garnet(Al_(2)O_(3)–Ce:YAG)ceramic phosphors reactive spark plasma sintering(SPS) structural-phase states microstructure luminescence performance

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Permafrost distribution and temperature in the Elkon Horst, Russia

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Research in Cold and Arid Regions 2021年第2期13卷 107-122页

作者： Mikhail Zhelezniak QingBai Wu Anatolii Kirillin Zhi Wen aleksandr Zhirkov Vladimir Zhizhin Melnikov Permafrost Institute SB RAS Yakutsk 677000Russia State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesCASLanzhouGansu 730000China

The Elkon Horst is a geological structure that consists of heterogeneous strata with highly variable geocryological and temperature conditions. Gaining accurate knowledge of permafrost distribution patterns within this structure is of both scientific and practical importance. In mountainous terrain, the ground thermal regime is controlled by both surface and subsurface conditions. Surface conditions include snow cover characteristics, the presence or absence of vegetation, vegetation density, etc.. In contrast, subsurface conditions involve rock lithology or petrography, density, quantity and depth of fissures, groundwater, etc.. This article examines ground thermal regimes in various geomorphological settings based on temperature measurement data from geotechnical boreholes. The occurrence and extent of permafrost were evaluated for the entire horst area using direct and indirect methods. The maximum permafrost thickness measured in the Elkon Horst is 330 m, and the estimated maximum is 450 m at higher elevations. Thermophysical properties were determined for the major rock types, and the geothermal heat flux was estimated for the study area. The thermal conductivities were found to vary from 1.47 to 4.20 W/(m·K), and the dry bulk densities to range between 2,236 kg/m~3 and 3,235 kg/m~3. The average geothermal heat flux was estimated to be 44 mW/m~2.

关键词： permafrost ground temperature geothermal heat flux thermal conductivity horst

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Galectin-3-centered paracrine network mediates cardiac inflammation and fibrosis upon β-adrenergic insult

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Science China(Life Sciences) 2023年第5期66卷 1067-1078页

作者： Guomin Hu Jimin Wu Huijun Gu Xiangning Deng Wenli Xu Shan Feng Shuaixing Wang Yao Song Zhengda Pang Xiuling Deng aleksandr E.Vendrov Nageswara R.Madamanchi Marschall S.Runge Xinyu Wang Youyi Zhang Han Xiao Erdan Dong Department of Cardiology and Institute of Vascular Medicine Peking University Third HospitalNHC Key Laboratory of Cardiovascular Molecular Biology and Regulatory PeptidesKey Laboratory of Molecular Cardiovascular ScienceMinistry of EducationBeijing Key Laboratory of Cardiovascular Receptors ResearchResearch Unit of Medical Science Research Management/Basic and Clinical Research of Metabolic Cardiovascular DiseasesChinese Academy of Medical SciencesBeijing 100191China Department of Physiology and Pathophysiology Cardiovascular Research CenterSchool of Basic Medical SciencesXi’an Jiaotong University Health Science CenterXi’an 710061China Department of Internal Medicine Frankel Cardiovascular CenterUniversity of MichiganAnn ArborMI48109USA Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100087China

Rapid over-activation of β-adrenergic receptors (β-AR) following acute stress initiates cardiac inflammation and injury by activating interleukin-18 (IL-18),however,the process of inflammation cascades has not been fully *** present study aimed to determine the mechanisms of cardiac inflammatory amplification following acute sympathetic *** bioinformatics analysis,galectin-3 was identified as a potential key downstream effector of β-AR and IL-18 *** serum level of galectin-3 was positively correlated with norepinephrine or IL-18 in patients with chest *** the heart of mice treated with β-AR agonist isoproterenol (ISO,5 mg kg^(-1)),galectin-3 expression was upregulated markedly later than IL-18 activation,and Nlrp3^(-/-)and Il18^(-/-)mice did not show ISO-induced galectin-3 *** was further revealed that cardiomyocyte-derived IL-18 induced galectin-3 expression in macrophages following ISO ***,galectin-3deficiency suppressed ISO-induced cardiac inflammation and fibrosis without blocking ISO-induced IL-18 *** with a galectin-3 inhibitor,but not a β-blocker,one day after ISO treatment effectively attenuated cardiac inflammation and *** conclusion,galectin-3 is upregulated to exaggerate cardiac inflammation and injury following acute β-AR activation,a galectin-3 inhibitor effectively blocks cardiac injury one day after β-AR insult.

关键词： galectin-3 interleukin-18 β-adrenergic receptor macrophage inflammation fibrosis

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The Biodiversity of Shrimp Genus Artemia from Russian Lakes:Morphometric,Cytogenetics and DNA-analysis

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 58-60页

作者： Elena BOYKO Lyudmila LITVINENKO aleksandr LITVINENKO FSEI HPE FSUE

Shrimps of genus Artemia are the inhabitants of continental and marine waters with salinity of 70 to 350 g/l and *** is able to survive in the conditions in which other animals cannot *** is due to adaptations:effective osmoregulation system,the ability to synthesize of respiratory pigment(hemoglobin)and diapauses cysts(Litvinenko ***.,2009).Cysts of this

关键词： Artemia morphometric analysis cytogenetic analysis DNA analysis salinity.

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Influence of shielding gas and non-consumable electrode configuration on weld formation

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China Welding 2021年第4期30卷 17-24页

作者： aleksandr Savinov Oleg Polesskiy Vladimir Lysak Pavel Krasikov Artem Chudin Volgograd State Technical University Lenin av.28Volgograd400005Russia

The effect of the shielding gas composition and the cathode processing history on the weld formation quality during welding with a non-consumable electrode at high current was studied. The major reasons for pores, “waists” and undercuts formation during welding at high currents and speed are discrete melt movement to the solidification front due to the arc decline from the cathode axis and significant melt overhanging in the pool tail part caused by excessive peak pressure on the discharge axis. Cathode flow dispersion causes the lack of displacement of the molten metal which results in its laminar flow in the weld pool, uniform flow of the metal to the crystallization front and sound weld formation. The melt movement in the weld pool and eventually the welded joint quality is determined by the pressure distribution pattern on the welded metal surface and the anode spot lag from the electrode. It was demonstrated that non-consumable electrode configurations that provide arcing with a diffuse cathode spot and increased helium concentration in the inert atmosphere during welding with a conical electrode allow sound weld formation.

关键词： tungsten inert gas welding non-consumable electrode inert gas weld seam formation

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Nanoscale inhibition of polymorphic and ambidextrous lAPP amyloid aggregation with small molecules

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Nano Research 2018年第7期11卷 3636-3647页

作者： aleksandr Kakinen Jozef Adamcik Bo Wang Xinwei Ge Raffaele Mezzenga Thomas P. Davis Feng Ding Pu Chun Ke ARC Centre of Excellence in Convergent Bio-Nano Science and Technology Monash Institute of Pharmaceutical Sciences Monash University 381 Royal Parade Parkville VIC 3052 Australia Food & Soft Materials Department of Health Sciences & Technology ETH Zurich Schmelzbergstrasse 9 LFO E23 8092 Zurich Switzerland Department of Physics andAstronomy Clemson University Clemson SC29634 USA Department of Chemistry Warwick University Gibbet Hill Coventry CV4 7AL UK

Understanding how small molecules interface with amyloid fibrils at the nanoscale is of importance for developing therapeutic treatments against amyloid-based diseases. Here, we show for the first time that human islet amyloid polypeptides （LAPP） in the fibrillar form are polymorphic, ambidextrous, and possess multiple periodicities. Upon interfacing with the small molecule epigallocatechin gallate （EGCG）, IAPP aggregation was rendered off-pathway and assumed a form with soft and disordered clusters, while mature IAPP fibrils displayed kinks and branching but conserved the twisted fibril morphology. These nanoscale phenomena resulted from competitive interactions between EGCG and the IAPP amyloidogenic region, as well as end capping of the fibrils by the small molecule. This information is crucial in delineating IAPP toxicity implicated in type 2 diabetes and for developing new inhibitors against amyloidogenesis.

关键词： islet amyloid polypeptides(LAPP) fibriUization persistence length small molecule discrete moleculardynamics (DMD)simulations inhibition

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Pt-Al<sub>2</sub>OM<sub>3</sub>Composite Material Designed for Cyclic Production of Optical Glasses under High Temperature Conditions

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Journal of Materials Science and Chemical Engineering 2014年第3期2卷 30-36页

作者： aleksandr Bochegov aleksandr Ermakov Irina Vandysheva IFE UrFU Yekaterinburg Russia JSC Urals’ Innovation Technologies Yekaterinburg Russia

The article considers one of the possible approaches to the solution of an urgent issue of metal consumption reduction, increase of operating life and maximum operating temperature as well as reduction of irrecoverable losses of platinum products and alloys when operating under high temperature conditions, particularly for glassblowing and single crystal growing crucibles. A two-layered composite material based on platinum-group metals and corundum plasma ceramics is thoroughly investigated. A successful experience of crucibles exploitation, designed for production of high temperature optical glasses from the composite and results of the research on composite material specimens are described.

关键词： Sandwich-Structured Composite Material Plasmaceramics Platinum-Group Metals Reduction of Metal Consumption Crucibles for Glassblowing and Single Crystal Growing High Temperature Creep High Temperature Strength and Heat Resistance Irrecoverable Losses

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Scanning Mode Application of Neutron-Gamma Analysis for Soil Carbon Mapping

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Pedosphere 2019年第3期29卷 334-343页

作者： aleksandr KAVETSKIY Galina YAKUBOVA Nikolay SARGSYAN Clyde WIKLE Stephen A. PRIOR Henry Allen TORBERT Bryan A. CHIN United States Department of Agriculture-Agricultural Research Service (USDA-ARS) National Soil Dynamics Laboratory Auburn AL 36832 (USA) Auburn University Detection and Food Safety Center Samuel Ginn College of Engineering Auburn AL 36849 (USA)

Soil carbon mapping is extremely useful in assessing the effect of land management practices on soil carbon storage. Applications of neutron-gamma analysis in scanning mode for mapping of soil carbon are discussed. A Global Positioning System(GPS) device and softwares required to simultaneously acquire gamma signals and geographical positions during scanning operations were added to an existing measurement system. The reliability of soil carbon measurements in scanning mode was demonstrated to be in agreement with results acquired from static mode. The error analysis indicated that scanning measurements can be conducted with the same accuracy as static measurements in approximately one fourth the time. To obtain results suitable for mapping analogous to traditional chemical analyses(i.e.,± 0.5 in weight percent or ± 0.5 w%), scanning time over a given site should be ca. 15 min using the current measurement system configuration. Based on this measurement time, a reasonable towing speed of 3–5 km h^-1, the necessity for complete site coverage during scanning, the number of sites(within the surveyed field), and the required total measurement time can be estimated. Soil carbon measurements for 28 field sites(total area ca. 2.5 ha) were conducted in ca. 8 h. Based on acquired data,a soil carbon distribution map was constructed utilizing various softwares. The surveyed field area included an asphalt road that had carbon readings higher than the surrounding land. The clarity with which these carbon-rich zones were delineated on the constructed map represents evidence supporting the veracity of this method. Neutron-gamma analysis technology can greatly facilitate timely construction of soil carbon maps.

关键词： ArcGIS Google Earth Pro IGOR scanning technology soil carbon distribution map soil carbon storage

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数字经济中的虚拟团队：组建和管理

数字经济中的虚拟团队：组建和管理

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作者：亚历山大（Chupalov aleksandr）哈尔滨工业大学

学位级别：硕士

数字化正在越来越迅速和深入地渗透到我们的活动和日常生活的各个领域。如今,数字技术在工业企业、教育机构、医疗机构和每个家庭中得到了积极的应用。它们被用于创建额外的虚拟现实,用于大数据分析和机器学习,用于机器人,用于3d打印,... 详细信息

数字化正在越来越迅速和深入地渗透到我们的活动和日常生活的各个领域。如今,数字技术在工业企业、教育机构、医疗机构和每个家庭中得到了积极的应用。它们被用于创建额外的虚拟现实,用于大数据分析和机器学习,用于机器人,用于3d打印,用于人工智能,医疗保健和科学研究领域。全球流行的情况推动了组织加速数字化的趋势。数字经济中各组织的业务条件发生了变化,信息量呈指数级增长,通信技术在全球范围内得到普及,因此有必要改变组建和管理团队和集体的方法。本研究考虑了管理风格对虚拟团队形成和管理的影响,以及这些风格对项目团队工作满意度的影响。分析方面的这种组合将提供对虚拟团队中各种领导风格对其项目成功的影响的理解。研究的对象是虚拟团队。研究的主题是虚拟团队的管理风格(领导力)与其在数字经济中形成和管理成功的关系,以及虚拟团队成员的满意程度。为了分析数字经济中团队合作的特点,采用问卷调查的方法进行了调查。该调查是通过Google表单进行的。该研究涉及企业主,教师,经理,业务招聘人员,IT专家,金融和银行部门的政府雇员,信息技术,建筑,政府机构和医疗保健。根据调查结果收集的数据,使用团队合作的主要行业,受访者的年龄类别,受访者在团队合作方面有哪些经验等被确认了。使用IDC研究公司的经验数据进行比较。在商业活动领域不包括跨境功能的虚拟项目的管理人员也被选为受访者,获得的数据与德勤(2019-2020)和HSE ISIEZ科学和技术预测中心的数据进行了比较。每项进行的研究都附有基于所获得数据的图表和统计表。定量研究包括数据的回归分析,其中包括虚拟团队管理中的不同领导风格。问卷的结果通过进行回归分析进行统计评估,以确定领导风格与项目成功之间的关系,以及对虚拟团队成员工作的满意度。分析单元是虚拟团队的单个成员。该研究的目的是科学地证实理论规定,并为虚拟团队的组建和管理制定切实可行的建议,同时考虑到数字经济发展的具体情况。该研究结果的理论和实践意义旨在为知识库做出贡献,并可反映在改进数字经济中虚拟团队的形成和管理的建议中。选择问卷作为研究方法,这是由于研究的客观性质,概括数据的能力,以及基于有效特征与所研究因素的联系进行回归分析的可能性。

关键词：虚拟团队数字经济管理事务性和变革性领导风格

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Revealing the nature of optical activity in carbon dots produced from different chiral precursor molecules

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Light(Science & Applications) 2022年第5期11卷 855-867页

作者： Ananya Das Evgeny V.Kundelev Anna A.Vedernikova Sergei A.Cherevkov Denis V.Danilov aleksandra V.Koroleva Evgeniy V.Zhizhin Anton N.Tsypkin aleksandr P.Litvin Alexander V.Baranov Anatoly V.Fedorov Elena V.Ushakova Andrey L.Rogach Center of Information Optical Technologies ITMO UniversitySaint Petersburg 197101Russia Research Park Saint Petersburg State UniversitySaint Petersburg 199034Russia Laboratory of Femtosecond Optics and Femtotechnology ITMO UniversitySaint Petersburg 197101Russia Laboratory of Quantum Processes and Measurements ITMO UniversitySaint Petersburg 197101Russia Department of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong KongKowloonHong Kong SAR 999077China Shenzhen Research Institute City University of Hong KongShenzhen 518057China

Carbon dots(CDs)are light-emitting nanoparticles that show great promise for applications in biology and medicine due to the ease of fabrication,biocompatibility,and attractive optical *** chirality,on the other hand,is an intrinsic feature inherent in many objects in nature,and it can play an important role in the formation of artificial complexes based on CDs that are implemented for enantiomer recognition,site-specific bonding,*** employed a one-step hydrothermal synthesis to produce chiral CDs from the commonly used precursors citric acid and ethylenediamine together with a set of different chiral precursors,namely,L-isomers of cysteine,glutathione,phenylglycine,and *** resulting CDs consisted of O,N-doped(and also S-doped,in some cases)carbonized cores with surfaces rich in amide and hydroxyl groups;they exhibited high photoluminescence quantum yields reaching 57%,chiral optical signals in the UV and visible spectral regions,and two-photon *** signals of CDs were rather complex and originated from a combination of the chiral precursors attached to the CD surface,hybridization of lower-energy levels of chiral chromophores formed within CDs,and intrinsic chirality of the CD *** DFT analysis,we showed how incorporation of the chiral precursors at the optical centers induced a strong response in their circular dichroism *** optical characteristics of these CDs,which can easily be dispersed in solvents of different polarities,remained stable during pH changes in the environment and after UV exposure for more than 400 min,which opens a wide range of bio-applications.

关键词： properties chiral carbon

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