Search Results 1-20 of 123

  • Special Issue on Integrated Study on Mitigation of Multimodal Disasters Caused by Ejection of Volcanic Products: Part 2

    Iguchi Masato , Nakada Setsuya , Miyamoto Kuniaki

    … The 2014 eruption of Kelud formed a gigantic ash plume over 17 km high, dispersing ash widely over the island of Java. … The SSDM is an integrated system of monitoring, constructed scenarios, forecasting scale of eruption, simulation of sediment movement and volcanic ash dispersion in the atmosphere. …

    Journal of Disaster Research 14(1), 5-5, 2019

    J-STAGE 

  • Numerical Simulations of Volcanic Ash Plume Dispersal for Sakura-Jima Using Real-Time Emission Rate Estimation

    Tanaka Hiroshi L. , Iguchi Masato

    … <p>In this study, a real-time volcanic ash dispersion model called PUFF is applied to the Sakura-jima volcano erupted on 16 June 2018 to assess the performance of the new system connected with a real-time emission rate estimation. … The emission rate of the ash mass from the vent is estimated based on an empirical formula developed for the Sakura-jima volcano using seismic monitoring and ground deformation data. …

    Journal of Disaster Research 14(1), 160-172, 2019

    IR  J-STAGE 

  • Meteorological Controls on Local and Regional Volcanic Ash Dispersal

    Poulidis Alexandros P. , Phillips Jeremy C. , Renfrew Ian A. , Barclay Jenni , Hogg Andrew , Jenkins Susanna F. , Robertson Richard , Pyle David M.

    … Volcanic ash has the capacity to impact human health, livestock, crops and infrastructure, including international air traffic. … For recent major eruptions, information on the volcanic ash plume has been combined with relatively coarse-resolution meteorological model output to provide simulations of regional ash dispersal, with reasonable success on the scale of hundreds of kilometres. …

    Scientific Reports (8), 2018-05-02

    IR 

  • Structural Control for Toughening Phenolic Resin  [in Japanese]

    Akihiro Matsumoto

    … (2) thermoplastic resins having a low elastic modulus were added to the phenolic resin to control the dispersion structure of modifiers. … (2) artificial zeolite made from fly ash was used. …

    Journal of Networkpolymer,Japan 39(2), 73-83, 2018

    J-STAGE 

  • Development of triangular interface element with drilling degrees of freedoms and its application to natural fiber reinforced carbon ceramics composite material  [in Japanese]

    KANDA Yasuyuki , FUKUMOTO Isao

    … To validate our proposed method, we conducted crack propagation analysis using a natural fiber reinforced carbon ceramic composite of bagasse ash and carbonized bagasse fiber. … In this numerical example, we changed the interface adhesion and dispersion of the carbonized bagasse fibers. …

    Transactions of the Japan Society for Computational Engineering and Science 2018(0), 20180004-20180004, 2018

    J-STAGE 

  • PHYSICAL PROPERTIES OF COMBINED HIGH EARLY STRENGTH PORTLAND CEMENT AND FLY-ASH FILLER FOR SOLIDIFICATION OF CESIUM ADSORBED ZEOLITE  [in Japanese]

    MAWATARI Hiroaki , NIWASE Kazuhito , SATO Seichi

    … We adopted the mix proportion which mixed with high early strength portland cement and fly-ash because we considered the influence of radiolysis of water which is needed for hydration reaction. …

    Cement Science and Concrete Technology 71(1), 653-660, 2017

    J-STAGE 

  • The Reinforced Effect of Micro-fibrillated Cellulose on Composites Prepared from Paper Sludge Ash

    Isa Akiko

    … <p>In this study, we investigated reinforcement effect of micro-fibrillated cellulose(MFC)on composites prepared from paper sludge(PS)ash. … The bending strength of MFC+PS ash composites was 1.5-5 times higher than that for PS ash only when additive rate of MFC was adjusted at 1, 3, 5, 10, 20, and 40%. … The reinforcement effect of MFC on the composites was due to adhesive effect between PS ash particles coated with MFC. …

    JAPAN TAPPI JOURNAL 71(12), 1454-1461, 2017

    J-STAGE 

  • Measurements of Particle Distribution and Ash Fluxes in the Plume of Sakurajima Volcano with Optical Particle Counter

    Elíasson Jonas , Yoshitani Junichi , Miki Daisuke , Weber Konradin , Bölke Christoph , Scharifi Emad

    … This problem has been dealt with by simulating the formation and migration of dangerous ash plumes. … However, the results of the simulations have sometimes been too safe, producing ash clouds that are too large. … Since 2012, an international cooperation team led by the Disaster Prevention Research Institute (DPRI) of Kyoto University has conducted airborne measurements of volcanic ash concentrations in the plume from Mount Sakurajima in Kagoshima Prefecture, Japan. …

    Journal of Disaster Research 11(1), 85-95, 2016

    J-STAGE 

  • Special Issue on Integrated Study on Mitigation of Multimodal Disasters Caused by Ejection of Volcanic Products

    Iguchi Masato

    … <p>Volcanic eruptions induce often widely dispersed, multimodal flows such as volcanic ash, pyroclastics, layers, and lava. … Lahars triggered by heavy rain may extend far beyond ash deposits. … The February 13, 2014, eruption of the Kelud volcano produced a gigantic ash plume over 17 km high, dispersing tehpra widely over Java Island. …

    Journal of Disaster Research 11(1), 3-3, 2016

    J-STAGE 

  • Numerical Simulations of Volcanic Ash Plume Dispersal from Kelud Volcano in Indonesia on February 13, 2014

    Tanaka Hiroshi L. , Iguchi Masato , Nakada Setsuya

    … <p>In order to evaluate airborne ash densities, a real-time volcanic ash dispersion model, PUFF, is applied to the February 13, 2014 eruption of Kelud volcano in Indonesia. …

    Journal of Disaster Research 11(1), 31-42, 2016

    J-STAGE 

  • Numerical Simulation of Volcanic Ash Plume Dispersal from Kuchinoerabujima on 29 May 2015

    Hiroshi L. TANAKA , Masato IGUCHI

    … In this study, airborne ash dispersal from the eruption of Kuchinoerabujima Volcano in Japan on 29 May 2015 is simulated using the volcanic ash tracking PUFF model. … A major eruption occurred at 9:59 am local time (0:59 UTC), and the ash plume reached 9 km above the ground. … According to MTSAT-2 satellite monitoring, the ash plume with a mushroom-shaped distribution drifted in the east-southeast direction. …

    Journal of Natural Disaster Science 37(2), 79-90, 2016

    J-STAGE 

  • Tephra Transport:Modeling and Forecasting  [in Japanese]

    SHIMBORI Toshiki

    … First, we describe elementary processes of the Tephra Transport and Dispersion Models (TTDMs) especially from the Lagrangian point of view. … The processes consist of advection, diffusion, gravitational fallout, dry deposition, wet scavenging, aggregation, resuspension and so on, which are taken into the operational models of Volcanic Ash Advisories and Volcanic Ash Fall Forecasts in the world. …

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 61(2), 399-427, 2016

    J-STAGE 

  • STUDY ON FLUIDITY OF CEMENT PASTE CONTAINING CARBON-FREE FLY ASH  [in Japanese]

    ISHIDA Masao , SATO Yoshiaki , OTANI Toshihiro , UEDA Kenji

    … <p>In this study, in order to clarify the influence of the characteristic of powders, Air-entraining and High-range water reducing agent(SP)on the fluidity of the cement paste containing Carbon-free Fly Ash(CfFA), the flow test was done by using a paste with different particle size distribution, replacement of CfFA and dosage of SP. … The improvement effect of fluidity by powders dispersion to CfFA of JIS class I was higher than that of other coarse powders.</p> …

    Cement Science and Concrete Technology 70(1), 313-320, 2016

    J-STAGE 

  • Distinctive organic matter pools among particle-size fractions detected by solid-state ^<13>C-NMR, δ^<13>C and δ^<15>N analyses only after strong dispersion in an allophanic Andisol(Soil chemistry and soil mineralogy)

    ASANO Maki , WAGAI Rota

    … We previously showed the first clear evidence of aggregate hierarchy in an Andisol by comparing the particle-size fractions released upon different levels of dispersion energy up to the maximum dispersion - sonication at 5 kJ mL^<-1> …

    Soil science and plant nutrition 61(2), 242-248, 2015-04

  • EVALUATION OF PARTICLES' COHESION AND DISPERSION STATES IN THE MIXING PROCESS OF CEMENT PASTE WITH LOW WATER-TO-BINDER RATIO  [in Japanese]

    NOMURA Hiroshi , NOGUCHI Takafumi

    … The particles' cohesion and dispersion states in the mixing process of cement paste with low water-to-binder ratio were evaluated quantitatively as the base for the estimation of the properties of the mixing of ultra-high-strength concrete. …

    Cement Science and Concrete Technology 69(1), 573-579, 2015

    J-STAGE 

  • Dewatering and Upgrading of Brown Coals by Mild Solvent Treatment  [in Japanese]

    ASHIDA Ryuichi , MIURA Kouichi

    … The Solubles and Deposits were almost ash-free, and were respectively rather close to each other in chemical and physical properties regardless of the parent materials. … The treatment can produce such low-molecular weight compounds in higher yields than the conventional heat treatment in inert gas atmosphere especially for low-rank coals, suggesting that dispersion of the coal molecules in solvent can suppress cross-linking reactions between the molecules. …

    Journal of the Japan Institute of Energy 93(11), 1066-1075, 2014-11

  • COAGULATION AND DISPERSION CHARACTERISTICS OF VOLCANIC ASH COAGULANTS AND THEIR APPLICATION TO TURBID WATER TREATMENT IN A RESERVOIR  [in Japanese]

    UMINO Hitoshi , KOBAYASHI Motoyoshi , HAKOISHI Noriaki

    … We have taken volcanic ash coagulants which contain allophane and investigated their coagulation, dispersion characteristics and electrokinetic phenomena. … Moreover, we conducted site experiment of coagulation treatment by using volcanic ash coagulants. … Zeta potential of coagulants were raised by adding ultrasonic dispersion. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 70(4), I_1573-I_1578, 2014

    J-STAGE 

  • Effect of Salinity on Lead Sorption and Migration of Clay Liner Materials  [in Japanese]

    NAKANO Akiko , MORISHITA Tomotaka , OHTSUBO Masami , HIGASHI Takahiro , KANAYAMA Motohei

    Batch sorption test and selective sequential extraction were conducted for two types of bentonite mixture using basalt soil and Andosol to examine the effect of salinity for their lead sorption abilit …

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 81(6), 535-541, 2014

    J-STAGE 

  • Classification of Inorganic Small Spherical Particles in Rime and Snow at the Summit of Mt. Kajigamori, Shikoku Island, Japan  [in Japanese]

    KURUMI Yuhya , SANAGAWA Yosuke , YAMAMOTO Yuhei , KAMIMURA Takeshi , IMAI Shoji

    … In order to investigate the long-range transfer mechanism of inorganic small spherical particles in wet-depositions, such as rime, snow and glaze, on the summit of Mt. Kajigamori (1399.4 m alt.), Kochi, Shikoku Island, in 2011–2013, the residue was obtained with a 0.45 μm pore-sized filter and then, a single-particle analysis was carried out for ones below 3 μm by using a Low-Vacuum Tabletop scanning electron microscope-energy dispersion X-ray spectroscopy (SEM-EDX). …

    BUNSEKI KAGAKU 63(10), 837-845, 2014

    J-STAGE 

  • Airborne Measurements of Volcanic Ash and Current State of Ash Cloud Prediction

    ELIASSON Jonas , YOSHITANI Junichi

    … Eyjafjallajökull 2010 and Grímsvötn 2011 eruptions created great problems for commercial aviation in the North Atlantic because of the large extent of the predicted ash clouds from these eruptions. … Comparison to satellite pictures showed the predictions very much larger than the ash cloud. … Measurements also showed lower ash concentrations over Europe than the predicted. …

    京都大学防災研究所年報 (58), 35-41, 2014

    IR 

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