Search Results 1-20 of 1599

  • Influence of Hydration Time Prior to Carbonation in Portland Cement Admixed with CaO Expansive Additive

    Palilu Juniarto M , Soegijono Bambang , Marbun Bonar T H

    … Many studies have observed degradation such as a decrease in the mechanical strength and an increase of permeability and porosity. … When utilized in wells as a zonal isolation material in the CO<sub>2</sub>-rich environment, such degradation can be worsen by hydration shrinkage of Portland cement, in which micro-annuli are formed and, thus, effective permeability is increased. …

    e-Journal of Surface Science and Nanotechnology 19(0), 32-41, 2021

    J-STAGE 

  • Improvement in Reduction Behavior of Sintered Ores in a Blast Furnace through Injection of Reformed Coke Oven Gas  [in Japanese]

    Higuchi Kenichi , Matsuzaki Shinroku , Saito Koji , Nomura Seiji

    … One possible method is the shaft injection or blast tuyere injection of coke oven gas (COG) with its hydrogen concentration enhanced by steam-reforming methane and tar. … The shaft injection of reformed COG promoted the reduction and improved the permeability of the ore layer, particularly in the wall area of the blast furnace. …

    Tetsu-to-Hagane 107(4), 290-300, 2021

    J-STAGE 

  • Method for Simulating Gas Permeability of a Coke Bed Including Fines Based on 3D Imaging on the Coke Particle Morphology

    Natsui Shungo , Hirai Azuma , Terui Koki , Kashihara Yusuke , Murao Akinori , Miki Yuji , Nogami Hiroshi

    … <p>In ironmaking blast furnaces, the particle size distribution and voids in the coke bed affects the upward flow of gas, and consequently, the efficiency of the combustion reaction. … To clarify the influence of coke pulverization on the packing structure of the coke bed, the permeability of the bed was evaluated using detailed dynamics simulation and geometric data analysis. …

    ISIJ International, 2021

    J-STAGE 

  • Investigation of Gas Diffusivity and Solubility of PES based Mixed Matrix Membranes Using Commercial SAPO-34 Zeolite

    Liu Yongsheng , Takata Kyosuke , Kita Hidetoshi , Tanaka Kazuhiro

    permeability and CO<sub>2/</sub>CH<sub>4</sub> … In our previous paper, the PES MMMs using laboratory-made SAPO-34 provided both higher permeability and selectivity than the neat PES membrane. … We also investigated the performance of these MMMs in terms of gas diffusivity and solubility. …

    Transactions of the Materials Research Society of Japan 46(1), 39-43, 2021

    J-STAGE 

  • Interface Behavior and Interaction Mechanism between Vanadium-Titanium Magnetite Carbon Composite Briquette and Sinter in Softening-Melting-Dripping Process

    Zhao Wei , Chu Mansheng , Guo Hongwei , Liu Zhenggen , Yan Bingji , Li Peng

    … Besides, the VTM-CCB, acting as skeleton in the molten mixtures, could provide more gas channels to improve the permeability of packed bed. … However, as the FC/O ratio exceeds 1.2, the Ti(C,N) would precipitate at the slag-metal interface and deteriorate the fluidity of molten mixtures, thereby deteriorating the gas permeability and increasing <i>T</i><sub>D</sub> …

    ISIJ International 61(1), 146-157, 2021

    J-STAGE 

  • Tensile-dominant fractures observed in hydraulic fracturing laboratory experiment using eagle ford shale

    Naoi Makoto , Chen Youqing , Yamamoto Kazune , Morishige Yuya , Imakita Keiichi , Tsutumi Naofumi , Kawakata Hironori , Ishida Tsuyoshi , Tanaka Hiroyuki , Arima Yutaro , Kitamura Shigehiro , Hyodo Daisuke

    … Hydraulic fracturing plays a vital role in the development of unconventional energy resources, such as shale gas/oil and enhanced geothermal systems to increase the permeability of tight rocks. … The interaction between fractures and constituent grains/other inclusions (e.g. organic substances) seemed to increase the complexity of the fractures, which may contribute to the efficient production of shale gas/oil via hydraulic fracturing. …

    Geophysical Journal International 222(2), 769-780, 2020-08-01

    IR 

  • Current perspectives on pressure-core analysis technology for gas-hydrate-bearing sediments  [in Japanese]

    今野 義浩 , 米田 純 , 神 裕介

    石油技術協会誌 = Journal of the Japanese Association for Petroleum Technology 85(1-6), 157-165, 2020-01

  • Development and Evaluation of Solid-state Diffusion Bonding Technic for Mass Production of Microfluidic Devices  [in Japanese]

    NARA Takeru , TANAKA Akihiro , SATO Shigeki , YOKOYAMA Sho

    … Since the microfluidic devices are often used in combination with optical observation, it is necessary to use light-permeable materials to bond the microfluidic plates to minimize the amount of deformation without blocking the microfluidic channel while maintaining the light permeability. … Also, since PDMS is gas-permeable, bubbles are generated from the flow channel walls of devices that undergo heating or chemical reactions, which can block the microfluidic channels. …

    The Proceedings of Mechanical Engineering Congress, Japan 2020(0), J02601, 2020

    J-STAGE 

  • Validation of CFD Simulation Results for Hydrogen Gas Diffusion Behavior in the Ground  [in Japanese]

    SUGIMOTO Kenji , SUGIMOTO Sachiyo , ICHIKAWA Yuji , OGITA Masakazu , ASAHI Ippei

    … <p>Hydrogen energy is expected to be put to practical use, and it is very important to understand hydrogen gas diffusion behavior and ensure safety when hydrogen gas pipelines are damaged. … Therefore, assuming hydrogen gas leakage due to damage to a buried pipeline, hydrogen gas diffusion behavior in the ground and in the atmosphere near the ground surface was investigated by full-scale experiments and CFD simulations. …

    The Proceedings of Mechanical Engineering Congress, Japan 2020(0), J01101, 2020

    J-STAGE 

  • Effects of Heterogeneous Seal Layer Property on The Long-Term Behaviour of CO<sub>2</sub> Injected into Deep Multilayer Systems  [in Japanese]

    KANO Yuki , ISHIDO Tsuneo , NAKAO Shinsuke

    … to escape from the reservoir, even if the globally averaged permeability of the seal layer seems low enough. … To represent a seal layer composed of low permeability rocks intersected by sandstone channels, <tt>'</tt>MINC<tt>'</tt> … Also conducted is sensitivity analysis to investigate the effects of key parameters such as capillary pressure, relative permeability, temperature, and the thickness of the formations. …

    Journal of MMIJ 136(12), 140-150, 2020

    J-STAGE 

  • Effect of Titanomagnetite Ironsand Coal Composite Hot Briquette on Softening-melting Performance of Mixed Burden under Simulated Blast Furnace Conditions

    Tang Jue , Zhang Zedong , Chu Mansheng , Zhao Wei , Liu Zhenggen

    … It was showed that the softening-melting-dripping behavior and the permeability of mixed burdens could be improved obviously by an appropriate ICHB charging. … However, the excessive ICHB charging would promote the precipitation of Ti(C,N) with a high melting point at the interface between metal and slag, which resulted in the deterioration of dripping and further worsening the gas permeability of mixed burdens. …

    ISIJ International 60(11), 2350-2356, 2020

    J-STAGE 

  • Improvement in Reduction Behavior of Sintered Ores in a Blast Furnace through Injection of Reformed Coke Oven Gas

    Higuchi Kenichi , Matsuzaki Shinroku , Saito Koji , Nomura Seiji

    … One possible method is the shaft injection or blast tuyere injection of coke oven gas (COG) with its hydrogen concentration enhanced by steam-reforming methane and tar. … The shaft injection of reformed COG promoted the reduction and improved the permeability of the ore layer, particularly in the wall area of the blast furnace. …

    ISIJ International 60(10), 2218-2227, 2020

    J-STAGE 

  • Study of blood compatibility and gas exchange performance in oxygenator of silicone hollow fiber  [in Japanese]

    Ito Nano , Hara Shintaro , Chou Fang Yu , Matsuo Yoichi , Masuda Tsukuru , Takai Madoka

    <p>現在、外側灌流型人工肺は非対称構造の中空糸膜を使うことが一般的だが、多孔質膜同様に中長期の使用では血漿がガス側に漏れてしまう。血漿漏れを防ぐためガス透過性の高いシリコーン中空糸均質膜と生体由来材料である架橋型2-Methacryloyloxyethylphosphorylcholine(MPC)ポリマーを組み合わせることで、この問題を解決しようと考えた。人工肺への応用において、シ …

    Transactions of Japanese Society for Medical and Biological Engineering Annual58(Abstract), 267-267, 2020

    J-STAGE 

  • Gas barrier properties of inorganic–organic nanocomposite gas barrier membranes with high content of layered double hydroxide (LDH) using surface modified LDH

    KURAOKA Koji , MIKI Kazumi

    … Inorganic–organic nanocomposite gas barrier membranes with high content of layered double hydroxide (LDH) using surface modified LDH on plastic film were prepared by cross-linking reaction. … The effect of LDH content on the gas barrier properties [oxygen permeation and water vapor transmission rate (WVTR)] of the membrane was investigated. …

    Journal of the Ceramic Society of Japan 128(8), 573-576, 2020

    IR  J-STAGE 

  • Gas Permeability Evaluation of Granulated Slag Particles Packed Bed during Softening and Melting Stage with Fanning's Equation

    Ohno Ko-ichiro , Kitamura Yoshiki , Sukenaga Sohei , Natsui Sungo , Maeda Takayuki , Kunitomo Kazuya

    … Correct knowledge about gas permeability of cohesive layer is becoming more and more important. … In order to precisely understand cohesive behaviour, a softening and melting simulator under rapid heating and quenching conditions was applied for clarify a determinant factor of gas permeability behaviour. …

    ISIJ International 60(7), 1512-1519, 2020

    J-STAGE 

  • Prediction of Softening Behavior of Simulant Sinter Ore by ADEM-SPH Model

    Ishihara Shingo , Ohno Ko-ichiro , Konishi Hirokazu , Watanabe Takashi , Natsui Shungo , Nogami Hiroshi , Kano Junya

    … <p>Softening and melting phenomena of burdens in the cohesive zone in the blast furnace are factors that cause the deterioration of gas permeability. …

    ISIJ International 60(7), 1545-1550, 2020

    J-STAGE 

  • Permeation and Blockage of Fine Particles Transported by Updraft through a Packed Bed (Numerical Approach)

    Satou Shin , Stephan Siahaan Andrey , Oishi Yoshihiko , Kawai Hideki , Nogami Hiroshi

    … A three-dimensional numerical model is built and observed by the coupling system of DEM-CFD, performed to understand the principal factors that affected fine and gas permeability. … In the case of lower particle diameter ratio, updraft gas will easy to permeate along with fine particles because of the existing of large open flow channels relative to fine diameter. …

    ISIJ International 60(7), 1551-1559, 2020

    J-STAGE 

  • Numerical Simulation on Phenomena of Fine Particles Passing through an Orifice under Gas Flow Condition

    Stephan Siahaan Andrey , Oishi Yoshihiko , Kawai Hideki , Nogami Hiroshi

    … These powders flow through the packed bed inside the furnace entrained by the gas flow. … The powders accumulation in packed bed will deteriorate gas and liquid permeability and creates an unstable situation inside the blast furnace. …

    ISIJ International 60(7), 1528-1537, 2020

    J-STAGE 

  • Ash Particle Behaviors during Combustion and Gasification of Coke

    Ueki Yasuaki , Teshima Koki , Yoshiie Ryo , Naruse Ichiro

    gas is emitted from blast furnaces in ironmaking processes because large amounts of coke and pulverized coal are consumed as the reducing agent and heat source. … However, fine particles such as ash, derived from coke and pulverized coal, may affect the permeability in the furnace under low RAR operation. … gas mixture atmosphere at temperatures from 1473 to 1673 K. …

    ISIJ International 60(7), 1427-1433, 2020

    J-STAGE 

  • Gas Permeability Improvement Mechanism at the Blast Furnace Cohesive Zone by Mixed Coke Charging in Ore Layer and Effect of Coke Mixing for Different Cohesive Zone Condition on Gas Permeability

    Yakeya Masahiro , Kasai Akito , Tadai Rikizo , Nozawa Kentaro

    … <p>A major operational problem in increasing pulverized coal rate and decreasing coke rate must be the increased pressure drop or the worsened gas permeability at the lower part of the blast furnace. … Results obtained by numerical analysis and experiments are as follows:</p><p>(1) Numerical analysis using DEM (Discrete Element Method) clarified the change in the cohesive ore bed structure with mixed coke charging and the formation conditions of gas path in the bed. …

    ISIJ International 60(7), 1438-1444, 2020

    J-STAGE 

Page Top