Search Results 1-20 of 59

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  • Phreatomagmatic eruptions of 2014 and 2015 in Kuchinoerabujima Volcano triggered by a shallow intrusion of magma

    Nobuo Geshi , Masato Iguchi , Hiroshi Shinohara

    Continuous heat transfer from the degassing magma body heated the hydrothermal system and the increase of the fluid pressure in the hydrothermal system caused fracturing of the unstable edifice, inducing a phreatic explosion. …

    Journal of Natural Disaster Science 37(2), 67-78, 2016


  • Vacuum Technologies in High-Power Proton Accelerators  [in Japanese]

    KAMIYA Junichiro

    … Responding to the upgradation of the beam power, continuous improvements of the vacuum system have been performed, e.g., beam loss reduction by improving the beam line pressure, in-situ degassing of the kicker magnet, and magnetic shielding via beam pipes and bellows made of soft magnetic material. …

    Journal of the Vacuum Society of Japan 59(8), 213-221, 2016


  • Characteristics and Sampling Method of Eruptive Products for Understanding Volcanic Eruptions  [in Japanese]

    SHIMANO Taketo

    … The eruption style strongly depends on the degassing history of ascending magma in conduit from depths. … Thus continuous monitoring of volcanic products is fundamental for further understanding and forecast of eruption, and are to some extent successful in obtaining time series data of mass ashfall rate and petrological characteristics. …

    Earozoru Kenkyu 30(3), 183-189, 2015


  • Gray-box modeling for prediction and control of molten steel temperature in tundish

    Ahmad Iftikhar , Kano Manabu , Hasebe Shinji , Kitada Hiroshi , Murata Noboru

    … To realize stable production in the steel industry, it is important to control molten steel temperature in a continuous casting process. … In addition, the developed gray-box models are used to determine the optimal molten steel temperature in the Ruhrstahl–Heraeus degassing process from the target TD temp, since the continuous casting process has no manipulated variable to directly control TD temp. …

    Journal of Process Control 24(4), 375-382, 2014-04


  • Hydrogen-induced Breakout in Continuous Casting of Non-degassed Steel  [in Japanese]

    Ueshima Yoshiyuki , Mizoguchi Toshiaki , Takagi Yukiko , Kondo Katsumi , Kato Hisashi

    … Hydrogen-induced sticker breakouts in aluminum-killed steel production without a degassing route have often been reported elsewhere, but so far, yet the mechanism has not been thoroughly explained quantitatively. … In order to obtain a better understanding of this phenomenon, hydrogen gas evolution from the solidified shell at the early stage of solidification in continuous casting was analyzed, taking into account the δ→γ …

    Tetsu-to-Hagane 98(10), 526-533, 2012


  • A5 Fundamental Investigation on Sono-Photo Synergy with 2.4 MHz Ultrasound  [in Japanese]

    Enomoto Naoya , Miyajima Toshikazu , Hojo Junichi , Tanaka Kenichiro

    … It was found that the continuous bubbling through the sonication is quite effective in enhancing the KI index only at 2.4 MHz. … One supporting data for this is that the degassing from water during the 2.4 MHz sonication was much more that that of the 200 kHz's or still standing. …

    Proceedings of the Annual Meeting of the Japan Society of Sonochemistry 21(0), 9-10, 2012


  • Grain Refinement in Continuously Cast Magnesium Alloy Billets by Ultrasonic Radiation  [in Japanese]

    SASAKI Yuh , TSUNEKAWA Yoshiki , OKUMIYA Masahiro , SHIMIZU Kazunori

    … Ultrasonic vibration has been applied to a variety of liquid phase processes such as grain refinement and degassing in aluminum alloys. … In the present study, ultrasonic radiation was applied to the continuous casting of magnesium alloy to refine its grain size. … The luminescent area was found to become much wider due to acoustic cavitation in continuous casting with a rotating ultrasonic horn compared to that with a fixed horn. …

    Journal of Japan Foundry Engineering Society 83(2), 93-98, 2011-02-25

    J-STAGE References (18)

  • Conduit Magma Process of Miyakejima Volcano Inferred from Basaltic Juvenile Materials in the Products of the Small Ash Eruptions during the Continuous Degassing  [in Japanese]

    GESHI Nobuo , SHINOHARA Hiroshi

    … The Miyakejima volcano repeats small ash eruptions from the degassing vent opening inside the A.D. … The juvenile glassy fragments in the tephra indicate that the basaltic magmas with primitive composition are ascending in the open conduit and degassing at the shallow depth. …


    J-STAGE References (22)

  • Partition coefficients of Ra and Ba in calcite


    … Homogeneous partition coefficients (<i>D</i>) for Ra and Ba in calcite were determined from coprecipitation experiments using the Continuous Addition Method (CAM). … Therefore, a coprecipitation experiment using the Free Drift Method (FDM) with slow degassing was also carried out. …

    GEOCHEMICAL JOURNAL 42(3), 295-304, 2008-06-01

    J-STAGE References (20)

  • Effect of dispersed Al3Sc particles in P/M 7000 series aluminum alloys on continuous dynamic recrystallization during hot extrusion  [in Japanese]

    ADACHI Hiroki , YAMAMOTO Yusuke , NAKANISHI Hidetaka , AIDA Tetsuo , IMAOKA Manabu , KUSUI Jun

    … During subsequent hot extrusion, continuous dynamic recrystallization (DRX) occurred and fine DRX grains with a diameter of 1 μm formed. … Continuous DRX occurs only under conditions in which the grain boundary mobility is low; … Thus, it is possible to promote continuous DRX by decreasing the Al<sub>3</sub>Sc particle diameter in 0.8 and 1.5 Sc alloys. …

    Journal of Japan Institute of Light Metals 58(8), 368-374, 2008


  • Study on Magma-hydrothermal System in Iwadake Volcano, Satsuma-Iwojima, by Numerical Simulation  [in Japanese]


    … A plausible model to explain the long degassing of large amount of volcanic gas is magma circulation in a conduit which is extended from the deep-seated magma reservoir. … The continuous active degassing probably causes the hydrothermal system within the volcano because the volcanic gas ascending the vent from the top of the magma to the surface is diffused to the surrounding formation. …

    Journal of the Geothermal Research Society of Japan 30(2), 97-106, 2008


  • Mathematical simulation of magma-hydrothermal system in Iwodake volcano  [in Japanese]

    松島 喜雄

    … A plausible model to explain the long degassing of large amount of volcanic gas is magma circulation in a conduit which extended from the deep-seated magma reservoir. … The continuous active degassing probably causes the hydrothermal system within the volcano because the volcanic gas ascending the conduit from the top of the magma to the surface is diffused to the surrounding formation. …

    Geophysical bulletin of Hokkaido University (70), 95-105, 2007-03

    IR DOI

  • Bubble connectivity in rhyolitic pumice: reconstruction of foaming suppression in a pyroclastic flow eruption  [in Japanese]

    Otaki Keiichi , Nakamura Michihiko , Takeuchi Shingo

    … The connectivity–vesicularity relation records the local and continuous foam–collapse process in the pyroclastic flow eruption, suggesting that magma foaming was suppressed at limited bulk vesicularity by a series of processes involving heterogeneous foaming, local and successive fragmentation of the foam with permeable gas flow, aggregation and welding of the fragments of bubble-wall melt, and continuous melt dehydration from the welded lumps. …

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2007(0), 57-57, 2007


  • Spray Degassing as a Method for Hydrogen Removal in Aluminum Melts

    Wu Ruizhi , Qu ZhiKun , Sun Baode , Shu Da

    … A continuous hydrogen-removal method from aluminum melt, spray degassing, is presented. … The hydrogen content of the outlet melt always contains a constant during the whole degassing time. … Compared with the rotary impeller degassing method, spray degassing consumes less treatment time and purging gas volume. … The experimental results show that, the spray degassing is a good hydrogen-removal method. …

    MATERIALS TRANSACTIONS 48(5), 1029-1033, 2007


  • Magma Plumbing System of the Asama Volcano Inferred from Continuous Measurements of GPS(<Special Section>The 2004 Eruption of Asama Volcano (1))  [in Japanese]

    MURAKAMI Makoto

    Continuous GPS measurements around the Asama volcano, central Japan, show a repetition of episodic inflations and deflations of the edifice. … It is also suggested that a buoyant bubble-rich magma surges episodically into the magma reservoir, then it loses the buoyancy through degassing process, and finally drains back to the further depth. …


    J-STAGE References (18) Cited by (8)

  • Petrological Characteristics of the 2004 Eruptive Deposits of Asama Volcano, Central Japan(<Special Section>The 2004 Eruption of Asama Volcano (1))  [in Japanese]

    SHIMANO Taketo , IIDA Akiko , YOSHIMOTO Mitsuhiro , YASUDA Atsushi , NAKADA Setsuya

    … In contrast, glass in ash from continuous strombolian explosions is less evolved chemically and is poorer in microlites. …


    J-STAGE References (24) Cited by (8)

  • Nozzle Clogging Behaviour of Ti-bearing Al-killed Ultra Low Carbon Steel

    BASU Somnath , CHOUDHARY Shiv Kumar , GIRASE Narendra U.

    … The work also attempted to identify suitable counter-measures for prevention of inclusion deposition in the submerged entry nozzles (SEN) during continuous casting of Ti-bearing Al-killed ULC steels. … The influence of all materials contacting liquid steel subsequent to the RH degassing, on the reoxidation behaviour and castability of liquid steel, was assessed from their chemical composition. …

    ISIJ International 44(10), 1653-1660, 2004-10-15

    J-STAGE References (27)

  • Climatic and environmental changes through the Paleogene : review and discussion  [in Japanese]


    … Sudden climate cooling event at the Eocene-01igocene boundary might have been caused by multiple or continuous impacts of extraterretrial materials. … EXtraordinarily warm climate during the Eocene may have been brought by either vigorous erosion and oxidation of organic carbons exhumed from the early Himalayan orogeny, or by voluminous metamorohic C0_2 degassing due to the regional metaraorphism. …

    Geoscience reports of Shizuoka University 30, 47-58, 2003-07

    IR DOI

  • Prediction Research on Recent Volcanic Eruptions : A View from Geophysical Observation(<Special Section>The Fourth Symposium on Prediction of Volcanic Eruptions)  [in Japanese]

    WATANABE Hidefumi

    … Usu volcano showed no remarkable inflation before the beginning of seismic swarm activity while Miyakejima showed quasi-continuous inflation. … After the beginning of the eruption, however, it was difficult to predict the time developments of the activities, especially in case of Miyakejima volcano where a caldera collapse was accompanied by repeated explosive hydromagmatic eruptions, and followed by a huge amount of continuous degassing. …


    J-STAGE References (24)

  • Rapid Sintering of High Strength-Alloyed Steels by Induction Heating Method  [in Japanese]

    NAKAMURA Mitsuru , TAKAHASHI Hiromi , SUGAYA Yoshimi

    … In this rapid sintering, the degassing process, diffusion of additional alloying elements and evolution of a Martensitic or Bainitic structure in the matrix were proved to play a very important role. … Thus, the substantial controlling factors were the holding time for degassing and the diffusion. …

    Journal of the Japan Society of Powder and Powder Metallurgy 49(6), 534-540, 2002-06-15

    J-STAGE References (7) Cited by (2)

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