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Frequency drift rate of solar decameter"drift pair"bursts

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Research in Astronomy and Astrophysics 2017年第9期17卷 101-110页

作者： aleksander Stanislavsky aleksander Konovalenko Yaroslav volvach Institute of Radio Astronomy Kharkiv 61002Ukraine v.N.Karazin Kharkiv National University Kharkiv 61002Ukraine

This paper deals with the detailed analysis of frequency drift rates of solar ＂drift pair＂（DP） bursts observed from 2015 July 10 to 12 during a type III burst storm. The observations were conducted by the UTR-2 radio telescope at 9-33 MHz with high frequency and time resolution. DPs were recorded drifting from higher to lower frequencies （forward DPs） as well as from lower to higher ones （reverse DPs）. Patterns on their dynamic spectrum had various inclines and occupied different bandwidths. The frequency drift rate versus frequency dependence of these bursts has been studied. The fitting model to describe the peak evolution of these bursts in the frequency-time plane is presented. The relationship between DPs and type III solar bursts is discussed.

关键词： Sun: corona -- Sun radio radiation -- methods observational -- techniques spectroscopic

Sediments from cryoconite holes and dirt cones on the surface of Svalbard glaciers:main chemical and physicochemical properties

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Acta Geochimica 2023年第2期42卷 346-359页

作者： Timur Nizamutdinov Bulat Mavlyudov vyacheslav polyakov Evgeny Abakumov Department of Applied Ecology Faculty of BiologySt.Petersburg State University16th Liniya V.O.29St.PetersburgRussia 199178 Russian Academy of Sciences Institute of GeographyMoscowRussia 119017

The paper discussed the influence of the forms of sediment accumulation on the surface of glaciers on their chemical and physicochemical *** materials sampled from the surface of five glaciers of the Svalbard Archipelago was *** studied such forms of sediment accumulation as dirt cones-the ice core covered with sediments and cryoconite holes-hollows on the glacier surface containing cryoconite *** such as total organic carbon content,microbiological activity,pH,the content of mobile forms of potassium and phosphorus,and concentrations of heavy and trace metals were ***,mesomorphological studies were carried out and the polydisperse composition of the sediments was *** to the results of this work,it was found that the content of organic carbon in the material selected from dirt cones and cryoconite holes can be up to 2.5%,but the content of clay particles in it is mainly at the 10–15%*** concentrations are up to 250 mg/kg,and phosphorus is up to 800 mg/*** content of metals is typical or lower than in the previously published *** main influence on the chemical composition of materials has a geographical factor of the sampling site,rather than the form of material accumulation.

关键词： Arctic Soil-like bodies Glacier sediments Accumulation

Geomorphological processes and landforms of glacier forelands in the upper Aktru River basin(Gornyi Altai), Russia: evidence for rapid recent retreat and paraglacial adjustment

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Journal of Mountain Science 2020年第4期17卷 824-837页

作者： David W.HEDDING aleksander A.EROFEEv Christel D.HANSEN Alexey v.KHON Zamir R.ABBASOv Department of Geography University of South AfricaJohannesburg 1710South Africa Department of Geography Tomsk State UniversityTomsk 637028Russia Department of Geography Geoinformatics and MeteorologyUniversity of PretoriaPretoria 0002South Africa Institute of Monitoring of Climatic and Ecological Systems(IMCES) Tomsk State UniversityTomsk 637028Russia

The glaciers in the Aktru River basin of Gornyi Altai, Russia currently represent some of the fastest receding glaciers in the world. Formation of the morainic complexes closest to the contemporary glaciers in the Aktru River basin took place during the 17^th-18^th centuries with recession commencing at the end of the 18 th century. Coupled with this glacial retreat, earth surface processes and vegetation succession are responding to shape the glacier forelands. This article presents the first geomorphological maps for the upper reaches of the Aktru River basin and focuses on the geomorphological landforms that occur in the rapidly changing glacier forelands. Geomorphological mapping is difficult in steep mountainous regions and, thus, mapping was completed using satellite imagery, field mapping and observations coupled with highresolution aerial photography obtained from Unmanned Aerial vehicles(UAvs). Critical steps of the procedure used to process UAv imagery and difficulties encountered in this mountainous terrain are noted. The acquired spatial data enable the mapping and classification of small-scale transient geomorphological features such as talus, glacial and glaciofluvial landforms. Their dynamics provide insights into supraglacial and subglacial processes of the glaciers of the Aktru River basin and subsequent paraglacial adjustment. The presented highresolution spatial data, which can also be obtained at high temporal resolutions in the future, can act as a reference frame for geomorphologists and ecologists studying the temporal evolution of glacier forelands of the Aktru River basin during paraglacial adjustment and subsequent colonisation and stabilisation by biota.

关键词： Geomorphology Glacier Forelands Unmanned Aerial vehicle Aktru Altai Russia

Inspection of aluminum alloys by a multi-frequency eddy current method

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Defence Technology（防务技术） 2015年第2期11卷 99-103页

作者： A.v.EGOROv v.v.polyakov D.S.SALITA E.A.KOLUBAEv S.G.PSAKHIE A.G.CHERNYAvSKII I.v.vOROBEI Altai State University Institute of Strength Physics and Materials Science SB RAS National Research Tomsk Polytechnic University S.P.Korolev Rocket and Space Corporation "Energia"

The paper proposes an experimental method of material inspection,which is based on digital processing of multi-frequency eddy current measurement *** influences of various factors(conductivity,the gap between the sample surface and the sensor,the thickness of the sample) on the obtained hodographs are examined by taking the aluminum alloys for example,and the possibility of separation of various factors is *** results obtained are indicative of how much promise the proposed method offers for the inspection and testing of products made of aluminum alloys.

关键词：铝合金涡流法检查多频数字处理测量数据电导率传感器

Genesis of pyroxenite veins in supra-subduction zone peridotites:Evidence from petrography and mineral composition of Egiingol massif(Northern Mongolia)

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China Geology 2020年第2期3卷 299-313页

作者： Anas A.Karimov Marina A.Gornova vasiliy A.Belyaev aleksander Ya.Medvedev Nikolay v.Bryanskiy A.P.vinogradov Institute of Geochemistry Siberian Branch of Russian Academy of Sciences IrkutskFavorskogo str.1A 664033Russia

Swarms of orthopyroxenite and websterite veins are found within Egiingol residual SSZ peridotite massif of Dzhida terrain(Central Asian Orogenic Belt,Northern Mongolia).The process of Egiingol pyroxenite veins formation is investigated using new major and trace element analyses of pyroxenite minerals,calculations of closure temperatures and composition of equilibrium *** pyroxenites show abundant petrographic and geochemical evidence for replacement of the residual peridotite minerals by ortho-and clinopyroxene due to melt-rock *** of peridotite olivines are found in pyroxenites,Cr#of spinel increases from peridotites to pyroxenites,and compositions of ortho-and clinopyroxene change from peridotite to *** authors show that calculated equilibrium melts for investigated pyroxenites are very similar to compositions of boninite lavas from the Dzhida ***,formation of pyroxenite veins most likely resulted from percolation of boninite melts through the Egiingol *** veins formed at first,followed by websterite ***,the authors assume that pyroxenite veins represent the channels for boninitic melts migration in supra-subduction environment.

关键词： Pyroxenite vein Boninite Partial melting Melt-rock interaction Supra-subduction zone peridotite Egiingol massif Dzhida terrain Central Asian Orogenic Belt Northern Mongolia

Energy flow problem solution based on state estimation approaches and smart meter data

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Global Energy Interconnection 2022年第5期5卷 551-563页

作者： Andrew v.Pazderin Ilya D.polyakov vladislav O.Samoylenko Department of Automated Electrical Systems Ural Federal UniversityYekaterinburgMira 19Russia System Operator of United Power System YekaterinburgTolmacheva 6Russia

Accurate electric energy(EE)measurements and billing estimations in a power system necessitate the development of an energy flow distribution *** paper summarizes the results of investigations on a new problem related to the determination of EE flow in a power system over time intervals ranging from minutes to *** problem is referred to as the energy flow problem(EFP).Generally,the grid state and topology may fluctuate over *** attempt to use instantaneous(not integral)power values obtained from telemetry to solve classical electrical engineering equations leads to significant modeling errors,particularly with topology changes.A promoted EFP model may be suitable in the presence of such topological and state ***,EE flows are determined using state estimation approaches based on direct EE measurement data in Watt-hours(volt-ampere reactive-hours)provided by electricity *** EFP solution is essential for a broad set of applications,including meter data validation,zero unbalance EE billing,and nontechnical EE loss check.

关键词： Automatic meter reading Advanced metering infrastructure Energy flow distribution Electricity losses Energy measurements State estimation.

Enabling rapid X-ray CT characterisation for additive manufacturing using CAD models and deep learning-based reconstruction

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npj Computational Materials 2023年第1期9卷 1443-1452页

作者： Amirkoushyar Ziabari S.v.venkatakrishnan Zackary Snow aleksander Lisovich Michael Sprayberry Paul Brackman Curtis Frederick Pradeep Bhattad Sarah Graham Philip Bingham Ryan Dehoff Alex Plotkowski vincent Paquit Energy and Electrification Infrastructure Division Oak Ridge National LaboratoryKnoxvilleTN 37830USA ZEISS Industrial Metrology LLC Maple GroveMN 55369USA Manufacturing Science Division Oak Ridge National LaboratoryOak RidgeTNUSA Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTNUSA

Metal additive manufacturing(AM)offers flexibility and cost-effectiveness for printing complex parts but is limited to few *** new alloys requires process parameter optimisation to produce consistent,high-quality ***-resolution X-ray computed tomography(XCT)has not been effective for this task due to artifacts,slow scan speed,and *** propose a deep learning-based approach for rapid XCT acquisition and reconstruction of metal AM parts,leveraging computer-aided design models and physics-based simulations of nonlinear interactions between X-ray radiation and *** significantly reduces beam hardening and common XCT *** demonstrate high-throughput characterisation of over a hundred AlCe alloy components,quantifying improvements in characterisation time and quality compared to high-resolution microscopy and *** approach facilitates investigating the impact of process parameters and their geometry dependence in metal AM.

关键词： rapid alloy character

Anodic process on Cu-Al alloy in KF-AlF3-Al2O3 melts and suspensions

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Transactions of Nonferrous Metals Society of China 2020年第5期30卷 1419-1428页

作者： Sai Krishna PADAMATA Andrey S.YASINSKIY Petr v.polyakov School of Non-Ferrous Metals and Materials Science Siberian Federal UniversityKrasnoyarskRussia

Anodic processes on Cu-10 Al electrode in molten KF-AlF3-Al2O3(saturated) and suspensions were characterized using chronopotentiometric and cyclic voltammetric techniques. Effects of cryolite ratio(CR= x(KF)/x(AlF3)), temperature and particle volume fraction(φ) on the electrochemical behaviour of the anode were demonstrated. Initially, the anode was polarised in the galvanostatic mode in melt and suspensions(φ=0.12, 0.15) at 750 ℃ with 0.4 A/cm^2 current density. The anode potential in melt varied between 2.5 and 3.2 v and in suspensions(φ= 0.12) between 3.3 and 3.4 v. XRD analysis was conducted to study the oxide phases on the anode surface. Anode limiting current densities and mass transfer coefficients drastically decreased with the increase of φ in the suspension. The results suggest that the Cu-10 Al electrode works better in suspensions with CR of 1.4 and particle volume fraction of 0.09 at 800 ℃.

关键词： aluminium suspension oxidation inert anode cryolite melt low-temperature electrolysis

Changes in the Structure and Properties of the Cu-Pb Composites Interface Jointed in the Solid Phase

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Open Journal of Metal 2018年第3期8卷 55-65页

作者： Boris v. Borts aleksander A. Parkhomenko Igor A. vorobiev aleksander A. Lopata vitaliy A. Aleksandrov Michael P. Domnich National Science Center “Kharkov Institute of Physics and Technology” Kharkov Ukraine

Research of structure and properties of Cu-Pb-Cu composite interface, obtained by technology of pack rolling of the pair of mutually insoluble metals, was performed using the methods of metallography, micro- and nano-hardness, mechanical tests, energy-dispersion elementary analyses. The work was aimed at the analyses of possible mechanical mechanisms of mass-transfer, determining the hardness of metal joint in conditions of absence of inter-diffusion. It was shown that different intensity of mass transfer of copper and lead takes place through the composite interface, which corresponds to the results obtained on the other system of dissimilar materials—copper-niobium. Qualitative explanation of these patterns was offered on the basis of more intensive plastic flow of fusible compound of the composite in conditions of roll-bond joining.

关键词： Solid State Joint Cu-Pb Composite Deformation Mass Transfer Interface