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Morphology of crater and caldera lakes in the Far Eastern region of Russia and the features of their development

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Journal of Mountain Science 2024年第4期21卷 1246-1258页

作者： Dmitrii N.KOZLOV Ekaterina V.LEBEDEVA Institute of Marine Geology and Geophysics Far Eastern Branch of the Russian Academy of SciencesYuzhno-Sakhalinsk 693022Russia Institute of Geography Russian Academy of SciencesMoscow 119017Russia

Volcanic lakes in the Kuril-kamchatka region are difficult to access,and for this reason,they remain poorly studied,with only scattered and brief data *** authors have conducted a study of 10 lake basins using modern digital echolocation survey techniques and have also compiled and summarized published data for 15 lakes in the region,calculating their main morphometric *** has been established that many caldera lake basins are modified by young explosive funnels,extrusive or effusive domes,and exhibit traces of hydrothermal *** lakes of the same genetic type in the Kuril-kamchatka region are similar in depth and depression forms,the group of caldera lakes shows less homogeneity across all morphometric *** was found that the absolute heights of the reservoirs on kamchatka Peninsula are generally greater than those on the Kuril Islands,as is often the case with the size of their *** volcanic lakes under study can rapidly change their volume and shape under the influence of endogenous *** the first time for this region,on the base of repeated observations,underwater extrusive dome rate growth and the approximate rates of 2 lake level changes were *** observations of lakes in the Ksudach calderas(kamchatka)and on Simushir Island indicate approximate rates of level changes:a decrease ranging within 0.5-0.6 m per year(over a 27-year observation interval)and an increase reaching up to 0.26 m per year(over a 48-year interval).The growth rate of the underwater extrusive dome in Lake Shtyubel has averaged 1-1.6 m per year over the past 25 *** analysis has facilitated the first generalization regarding the morphology and developmental features of crater and caldera lakes in the Kuril-kamchatka region of Russia,representing an important step in their *** results obtained will provide a solid foundation for subsequent research in this region and may be of interest to researchers studying

关键词： Volcanic lakes Echolocation survey Volcanism Gashydrotherms kamchatka Kuril Islands

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

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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

Electromagnetic monitoring in the region of seismic activization (on the Gorny Altai (Russia) example)

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Geodesy and Geodynamics 2019年第6期10卷 460-470页

作者： Nina N.Nevedrova Aidisa M.Sanchaa Alexander E.Shalaginov Sergey M.Babushkin Trofimuk Institute of Petroleum Geology and Geophysics of the Siberian branch of the RAS Novosibirsk630090Russia Seismological branch of geophysical survey of the russian academy of sciences 3 Academician Koptug ave.Novosibirsk630090Russia

Based on the analysis of the field data of nonstationary electromagnetic soundings with different installations,the evolution of the stressed state of the geological massif in the epicentral region of the destructive 2003 M_w7.3 Chuya earthquake is investigated in the *** measurements by these methods were executed in a lot of regular points located at two sites of the western part of the Chuya basin of Gorny Altai(russian Federation).The field works have been performed for 13 *** developed a measurement technique using data from the three Transient Electromagnetic Method(TEM)method settings for determination of the resistivity anisotropy *** of the field data is carried out based on the inverse problem solution,and further,taking into account the geological structure and seismological data,variations of true electrophysical characteristics of the cross-section(electrical resistivity and resistivity anisotropy coefficient)are *** to the TEM data acquired in the 1980 s,the geoelectric parameters of rocks in the period of low seismic activity were *** of the results of quantitative interpretation of the modern measurements(2004-2016)with those taken before the Chuya event allows tracing a change in the geoelectric parameters of the cross-section in the aftershock period,and on this basis tracking the evolution of the rock massif after the destructive seismic impact.

关键词： Transient electromagnetic Resistivity anisotropy coefficient Time-lapse survey Gorny Altai Chuya basin

Economic Consequences of Tahoku Earthquake of March 11, 2011 in Japan

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Journal of Civil Engineering and Architecture 2014年第1期8卷 29-36页

作者： Sergey Baranov Tatiana Skufina Kola branch of geophysical survey of russian academy of sciences Apatity 18409 Russia Institute of Economics Problems Kola Science Centre Russian Academy of Sciences Apatity 18409 Russia

The paper considers the economic consequences of Tahoku earthquake occurred on March 11,2011 at 5：46：23 （UT） at the distance of 70 km from the northeast shore of Japanese coast Honshu. This earthquake had a magnitude of 9 and became the strongest in the whole history of the seismological observations in this part of the planet. The generated tsunami killed more than 15,700 people, damaged 332,395 buildings and 2,126 roads. The total economic loss in Japan was estimated at $309 billion. The catastrophe in Japan also impacted global economy. To reveal its impact, the authors used regional and global stock indexes, production indexes, stock prices of the main Japanese, European and US companies, and import/export dynamics. The authors demonstrated that the catastrophe substantially affected the markets and on the short run in some indicators it exceeded the effect of the global financial crisis. The authors concluded that it is necessary to treat possible strong earthquakes in different regions of the world as one very important factor that can affect the world economy.

关键词： Tahoku earthquake economics consequences global economy stock indexes.

Environmental adaptations and constraints on latest Cretaceous Arctic dinosaurs

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Global Geology 2016年第4期19卷 241-254页

作者： Robert A.Spicer Alexei B.Herman Romain Amiot Teresa E.V.Spicer School of Environment Earth and Ecosystem SciencesOpen UniversityMilton KeynesMK7 6AAUK Geological Institute Russian Academy of Sciences119017 MoscowRussia Claude Bernard University of Lyon 1 and High Normal School of Lyon Dubois69622 Villeurbanne CedexFrance State Key Laboratory of Systematic and Evolutionary Botany Institute of BotanyChinese Academy of SciencesBeijing 100093China

The Arct ic hosts an extraordinary wealth of terrestrial fossil biotas of Late Cretaceous age representing a diverse and highly productive near-polar ecosystem that has no modern analogue. Compared to the rest of the Late Cretaceous Maastrichtian plant diversity was at its lowest and the temperature regime the coolest, yet the semi-open forests supported a rich dinosaur fauna made up of a wide range of body sizes and feeding strategies. The combination of mild winter temperatures and continuous darkness lasting several months imposed severe constraints on primary productivity. Plant survival strategies involved almost universal winter loss of foliage, which in turn limited food supply for non-migratory overwintering herbivorous animals. A combination of leaf form and tree ring studies has been used to quantify year round variations in temperature and determine the tim-ing of spring bud-break and autumnal leaf fall. While Maastrichtian winter temperatures were cold enough （down to - 10°C for brief intervals） for frequent frosts and snowfall, summer temperatures were cool but highly variable and at -830N along the north Alaskan coast frequently fel l below ＋ 10°C . Theropod egg shell frag-ments at - 76° N in the Maastrichtian of Northeastern Russia may indicate that dinosaur reproduction took place in the Arctic ecosystem, as distinct from taking place at lower latitude breeding grounds reached by migration. This raises the question of nest management and specifically the maintenance of incubation temperatures, and the duration of incubation. Of critical importance to year-round residency is the timing of hatching and juvenile care before winter darkness set in, temperatures fell to near freezing and food resources became limited.

关键词： Maastrichtian arctic ecosystems climate dinosaur reproduction