Search Results 1-20 of 1507

  • Fundamental Study on Relationship between Void Ratio and Suction Force of No.6 Crushed Aggregate Porous Concrete  [in Japanese]

    西村 十和 , 石井 雄大 , 山本 貴正 , 平岩 陸

    日本建築学会東海支部研究報告集 Proceedings of Tokai Chapter Architectural Research Meeting (59), 65-68, 2021-02

  • Modal damping ratio maximization of a vehicle frame under load using multi-material topology optimization  [in Japanese]

    INOZUME Seita , AIHARA Tatsuhito

    … In this study, we propose a method to create a high damping structure by multi-material topology optimization using viscoelastic material, structural material and void. … As a result, a structure with a high damping ratio that satisfies the constraints is obtained. … It is considered to be multimodal because a slight change in the filter radius changes the shape and damping ratio.</p> …

    Transactions of the JSME (in Japanese), 2021

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  • Flow Characteristics of Air-Water Two-Phase Flows in a Serpentine Tube  [in Japanese]

    KAZI Junichiro , MORI Hitoshi , FUKUMA Junpei , HAYASHI Kosuke , KURIMOTO Ryo , TOMIYAMA Akio

    … The pipe diameter, <i>D</i>, and the bend radius of curvature, <i>R</i>, were 20 mm, i.e. the bend ratio, <i>R/D</i>, was unity, and the length of the straight pipe was 1500 mm. … The void fraction in each section was measured by using a quick-closing valve method. …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 35(1), 85-92, 2021

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  • GEOMETRICAL CONSIDERATION FOR TIME DEPENDENCE OF VOID DISTRIBUTION OF CEMENT IN HYDRATION REACTION  [in Japanese]

    AIKAWA Yutaka , SAKAI Etsuo , NOGUCHI Takafumi

    <p>粒度分布および水セメント比を考慮したセメントペーストについて空隙の体積分布を考慮し、空隙に水分が充満してセメントペーストが水和反応を起こした場合の空隙の体積変化の幾何学的な考察およびそれに基づく数値解析を行った。その結果、水分を含む空隙の体積分布は水和反応が進むにつれ、計算上では分布面積の減少に伴い体積分布がより小さい粒径側にシフトする様子も捉えることができた。この結果を系の空隙 …

    Cement Science and Concrete Technology 74(1), 171-177, 2021

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  • Swelling-Pressure and Hydraulic Conductivity of Compacted Clays Focusing on the Clay-Mineral Type  [in Japanese]

    KOHNO Masanori

    … This result suggests that hydraulic conductivity can be estimated based on a specific surface area and void ratio of compacted clays.</p> …

    Journal of the Society of Materials Science, Japan 70(3), 272-278, 2021

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  • Creep Damage Assessment of Gr.91 Steel Welds by UPA Method  [in Japanese]

    SHIODA Yoshiki , SAITO Noriko , TANOUE Tatsuro , NOMURA Kyohei , KUBUSHIRO Keiji

    … The UPA indication was recognized near HAZ of the root part at creep life ratio of about 0.7. … After that, the UPA indication was locally propagated thorough the wall thickness direction with increasing creep life ratio. …

    Journal of the Society of Materials Science, Japan 70(2), 177-183, 2021

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  • A Concentrated AlCl3-Diglyme Electrolyte for Hard and Corrosion-Resistant Aluminum Electrodeposits

    Zhang Zelei , Kitada Atsushi , Gao Si , Fukami Kazuhiro , Tsuji Nobuhiro , Yao Zhengjun , Murase Kuniaki

    … The Al electrodeposits obtained from the electrolyte with an AlCl3/G2 molar ratio x = 0.4 showed a void-free microstructure composed of spherical particles, in stark contrast to flake-like morphologies with micro-voids for lower x. … Additionally, the void-free Al deposits had a <100> …

    ACS Applied Materials & Interfaces 12(38), 43289-43298, 2020-09-23

    IR 

  • Evaluation of mechanical properties of nanoparticles using a constant-volume shear tester

    Shimada Yasuhiro , Yamamura Kai , Matsusaka Shuji

    … For each sample, a single shear test provided the void fraction, stress relaxation ratio, stress transmission ratio, powder yield locus, consolidation yield locus, critical state line, shear cohesion, and flow function. … All the tests were conducted under ambient conditions using powder beds, in which the void fractions were in the range of 0.89–0.96. …

    Advanced Powder Technology 31(3), 1007-1012, 2020-03

    IR 

  • Theoretical Discussion on Relationship between Elastic Modulus and Void Ratio of Porous Concrete  [in Japanese]

    エルドンオチル , 曹 偉 , 榎本 涼介 , 仙田 駿 , 畑中 重光

    日本建築学会東海支部研究報告集 Proceedings of Tokai Chapter Architectural Research Meeting (58), 61-64, 2020-02

  • Void Fraction Measurement of R32 in Square Minichannels by Image Analysis  [in Japanese]

    KIKUCHI Shogo , JIGE Daisuke , INOUE Norihiro

    <p><tt>研究では,扁平多孔管を模して加工した</tt>1 <tt>辺が</tt>1.0 mm <tt>の正方形微細流路を複数有する水平流路内を流れる冷媒の流動様相の観察を行い,流動様相の画像解析からボイド率の算出を行った.実験には</tt>R32 <tt>を用いて,飽和温度</tt>4 …

    Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers 37(1), 89, 2020

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  • Experimental Investigation for Influence of Static Pressure and Steam Wetness on Pressure Fluctuation of Acoustic Resonance in Coaxial Side-Branch under Wet Steam Flow  [in Japanese]

    UCHIYAMA Yuta , MORITA Ryo

    … From our prior research on the combined effects of steam wetness and pressure on general characteristics of acoustic resonance amplitude under wet steam flows in a single branch, the reduction of the maximum amplitude under wet steam was related to both the steam wetness (void fraction) and the steam pressure (density ratio). …

    The Proceedings of the Dynamics & Design Conference 2020(0), 604, 2020

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  • ESTIMATION METHOD OF DEFORMATION MODULUS OF SUBGRADE SOIL CONSIDERED STRESS DEPENDENCY AND DRAINAGE CONDITION  [in Japanese]

    WAKATSUKI Hiroaki , KOHATA Yukihiro , TAMAYAMA Daisuke , MITACHI Toshiyuki

    <p> 本研究は,応力依存性と排水条件の違いが路床土の変形係数に及ぼす影響を適切に反映させた変形係数推定法の提案をめざしたものである.まず,ベンダーエレメント併用繰返し三軸試験(以下,CTX-BE試験)を物理特性の異なる土質材料(豊浦砂,洪積砂,まさ土,沖積粘土,ローム)に適用して,排水・非排水両条件下でのせん断剛性率<i>G</i>,変形係数<i> …

    Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering) 76(2), I_279-I_287, 2020

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  • Laboratory element tests on dynamic responses of gap-graded silica sand  [in Japanese]

    OTSUBO Masahide , DUTTA Troyee Tanu , GHAEMI Arian , LI Yang , KUWANO Reiko

    <p>本研究では,地盤構造物のフィルタ材等として使用される大きさの異なる粒子で構成されるギャップグレード材料の動的応答を解明することを目的に,室内要素試験を実施した.粗砂(硅砂3 号)と粒径の異なる三種類の細砂(硅砂5 号,7 号,8 号)を混合したギャップグレード硅砂を実験対象とし,細砂含有率が0%,10%,20%,30%,40%,50%,100% の供試体に対する弾性波伝播実験を実 …

    SEISAN KENKYU 72(6), 387-390, 2020

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  • Study on consolidation and liquefaction characteristics of sand with cementation effect  [in Japanese]

    SHIGA Masataka , KIYOTA Takashi , KATAGIRI Toshihiko

    <p>更新統の地層の液状化は従来の液状化判定では対象外であったが,近年議論が高まりつつ状況にある.本研究では更新統の地層の主特性であるセメンテーションに着目し,人為的にセメンテーションを付加した供試体に圧密および非排水繰り返し試験を行い,土粒子構造を表すせん断波速度の計測を行った.結果として圧密中のせん断波速度の変化は,<i>C</i>=0% において先行研究よ …

    SEISAN KENKYU 72(6), 419-422, 2020

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  • Reduction Effect of Water Content Calculated using Estimating Equations of Soils Stabilized by Reclaimed Hemihydrate Gypsums  [in Japanese]

    Sano Hiroaki , Yamada Mikio , Kotake Nozomu , Mae Toshifumi , Ogata Koichiro , Kawahara Hideo

    <p>本研究では,安定処理対象土に再生半水石膏を添加した石膏安定処理土の「真の含水比w<sub>t</sub>」とJIS法により得られた「見掛けの含水比w<sub>a</sub>」の推定式を,化学式を基にして構築してみることにした。得られた推定式より,「真の含水比w<sub>t</sub>」と「見掛けの含水比w&l …

    Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management 31(0), 183, 2020

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  • Effect of Flux on Void Formation During Copper Alloy Brazing  [in Japanese]

    Miura Hirokazu , Okada Hiroki , Miyazawa Yasuyuki , Kanazaki Fumio

    … Previous studies have confirmed that the gap shape and the gap size affect void formation. … Furthermore, it was confirmed that the behavior of the flux (gas and residue, which are generated from the flux) affected the void formation. …

    Journal of Japan Institute of Copper 59(1), 343-348, 2020

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  • Bonding Strength of Cu Sinter Die-Bonding Paste on Ni, Cu, Ag, and Au Surfaces under Pressureless Bonding Process

    Ishikawa Dai , Kawana Yuki , An Bao Ngoc , Mail Matthias , Wurst Helge , Leyrer Benjamin , Blank Thomas , Weber Marc , Ueda Suguru , Nakako Hideo

    … MD simulations revealed that Kirkendall voids were promoted by higher interdiffusion coefficients and a higher ratio of intrinsic diffusion coefficients between a bulk Cu layer and an Ag or Au layer. …

    Transactions of The Japan Institute of Electronics Packaging 13(0), E19-017-1-E19-017-11, 2020

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  • STRENGTH ESTIMATION OF IMPROVED GROUND WITH CONHESIVE FORCE BY THE SHEAR WAVE VELOCITY MEASUREMENT  [in Japanese]

    KUROSAKA Akiyoshi , UNNO Toshiyasu , AKIMOTO Teppei , UENO Kazuhiko

    <p> せん断波速度<i>V<sub>s</sub></i>の計測により,薬液注入工法や圧密促進工法によって改良された比較的小さな圧縮強度を有する地盤改良土の強度情報を推定し,その適用性を検討するため,ベンダーエレメント試験,三軸圧縮試験および一軸圧縮試験を行った.さらに,既存の提案式によってせん断波速度<i>V<sub …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 76(2), I_696-I_701, 2020

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  • A proposal of a method for predicting consolidation subsidence in small-scale buildings for shallow alluvial clay in the southeastern part of Saitama Prefecture and its verification examples  [in Japanese]

    KIKUCHI Yasuaki , ISHIDA Tetsuro

    <p>戸建住宅の地盤調査では,事前調査およびスウェーデン式サウンディング試験を主とした原位置試験を行うのが一般的である。圧密沈下を検討する場合は,圧密試験を実施し圧密諸定数を正確に把握することが望ましいが,経済的な理由により実施されることが少ない実状にある。本論文では,複数の宅地にて採取した浅部の沖積粘性土試料を用いて実施した室内土質試験結果の品質評価ならびに比較結果を吟味し,それらの …

    Japanese Geotechnical Journal 15(2), 327-337, 2020

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  • Interfacial Friction Factors in Vertical Circular Pipes under Flooding Conditions at the Bottom End  [in Japanese]

    SANO Naoki , TAKAKI Toshiya , NISHIDA Koji , MURASE Michio , GODA Raito , TOMIYAMA Akio

    … <p>In our previous study (Goda et al.), we measured the void fraction <i>α</i>, pressure gradient <i>dP/dz</i>, and countercurrent flow limitation (i.e. relationship between superficial velocities, <i>J<sub>G</sub></i> … The effect of fluid properties was expressed by a revision term with the viscosity ratio of gas and liquid phases (<i>μ<sub>G</sub>/μ<sub>L</sub></i>).</p> …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 34(1), 82-92, 2020

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