Search Results 1-20 of 419

  • Experimental Investigation on Seismic Resistance of RC Shear Walls with CFRP Bars in Boundary Elements

    Zhao Jun , Shen Fuqiang , Si Chenzhe , Sun Yuping , Yin Lu

    … Lower crack propagation height and larger concrete crushing region, bearing capacity and equivalent viscous damping coefficient (EVDC) could be observed with the increase of axial load ratios. … When the axial load ratio was small, the shear walls with circular stirrups had better energy dissipation than that with rectangular stirrups at a given drift level, while the cumulative energy dissipation (CED) were similar. …

    International Journal of Concrete Structures and Materials 14(1), 4, 2020-01-10

    IR 

  • Dissipation energy in sound-absorbing poroelastic material  [in Japanese]

    YAMAMOTO Takashi , KATSURA Daiji , KUBOTA Hiroshi

    … <p>In sound-absorbing poro-elastic media, the energy of incident sound wave is dissipated through the following three mechanisms: the viscous dissipation arising the vicinity of the boundary between the solid and fluid phases due to the viscosity of air, the thermal dissipation, and the viscoelastic dissipation due to the damping property of the material used in the solid phase. …

    Transactions of the JSME (in Japanese), 2020

    J-STAGE 

  • Evaluation of forced convective boiling heat transfer with layered parallel microchannels

    NISHIMURA Yusuke , OKAJIMA Junnosuke , OOUCHI Takuya , KOMIYA Atsuki

    … Experimental results showed that heat transfer rate and heat transfer coefficient increased with increasing refrigerant mass flow rate under the same superheat. … However, the maximum heat transfer coefficient reached a certain value even as the mass flow rate increased. … and a heat transfer coefficient of 5.20×10<sup>4</sup> …

    Journal of Thermal Science and Technology 15(1), JTST0006-JTST0006, 2020

    J-STAGE 

  • A note on estimating eddy diffusivity for oceanic double-diffusive convection

    Nakano Haruka , Yoshida Jiro

    Journal of oceanography 75(5), 375-393, 2019-10

  • Theoretical Study on an Effect of Liquid Viscosity and Thermal Conductivity on Weakly Nonlinear Waves in Bubbly Liquids  [in Japanese]

    亀井 陸史 , 金川 哲也

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 119(3), 11-13, 2019-04-15

  • Refrigeration Cycle Exergy-Based Analysis of Hydrocarbon (R600a) Refrigerant for Optimization of Household Refrigerator

    Alhamid M.I. , Nasruddin N , Budihardjo , Susanto E , Vickary T.F. , Budiyanto M. Arif

    … Through parameters of determinants of exergy such as enthalpy, entropy, mass flow rate, the coefficient of performance (COP), load array types, therefore the optimum use of refrigerant can be obtained. … The model analyses used is cycle that include irreversibility of heat transfer across finite temperature differences, heat leakage, and internal dissipation. …

    Evergreen 6(1), 71-77, 2019-03

    IR  DOI 

  • Vertical Eddy Diffusivity Estimated from the Thorpe Displacement Yoshinobu Wakata and Kenjirou Mizue  [in Japanese]

    Wakata Yoshinobu , Mizue Kenjirou

    海底乱流境界層の乱流鉛直渦拡散係数を,混合距離理論を用いて推定する方法を提案した.地衡流下の海底近くに発達する乱流をラージ・エディ・シミュレーション(LES)を用いて解き,その出力結果の解析から新しい鉛直渦拡散係数の推定方法を導出した.混合距離理論の混合距離としてThorpe 変位を用いることにより,渦拡散係数はKT=LT4/3 ε1/3のように計算できる.ここでLT はThorpe 変位で,ε …

    Bulletin on Coastal Oceanography 57(1), 15-19, 2019

    J-STAGE 

  • Shake Table Test of Light-gauge Cold-formed Steel Frame with Friction / Viscous Damper and Sliding Base:( Part 3 Two-Story Frame with Sliding Base)  [in Japanese]

    MIYAZU Yuji , SODA Satsuya , WATAI Kazuki , WAKITA Takehiro , TOMITA Ai

    … The sliding base proposed in this paper consists of an alloy plated steel and cross laminated timber (CLT), and has the friction coefficient of about 0.4 in order to slide when subjected to strong earthquake ground motions. … The LFIMDs are installed to the test frame to equalize the story drift of all the story and to enhance the energy dissipation capacity. …

    The Proceedings of the Dynamics & Design Conference 2019(0), 221, 2019

    J-STAGE 

  • Effect of Pillar and Mesh Structure of Tetrahedral Amorphous Carbon (ta-C) Coatings on the Wear Properties and Fracture Toughness of the Coating

    Bin Mustafa Mohd Muhyiddin , Umehara Noritsugu , Tokoroyama Takayuki , Murashima Motoyuki , Shibata Akinori , Utsumi Yoshiharu , Moriguchi Hideki

    … The friction coefficient for ta-C, Pillar ta-C and Mesh ta-C are within the range of 0.071 to 0.106. … Moreover, the Pillar and Mesh ta-C provides superior rate of crack-energy dissipation as compared to the ta-C.</p> …

    Tribology Online 14(5), 388-397, 2019

    J-STAGE 

  • REVISING WAVE INDUCED TURBULENT MIXING AND ITS IMPACT ON TROPICAL CYCLONE  [in Japanese]

    TAKAGI Masashi , OTSUKA Junichi , YAMADA Tomohito , SARUWATARI Ayumi , MORI Nobuhito , NINOMIYA Junichi , SHIMURA Tomoya , UCHIYAMA Yusuke , BABA Yasuyuki , MIZUTANI Hideaki , KUBO Teruhiro , WATANABE Yasunori

    <p> Feddersenらによって提案された表層乱流混合フラックスについてのバルク式におけるTKE flux係数αは海洋表層混合の計算において非常に重要である.観測された海象データをデータ解析することによって,海洋の表層混合のパラメタリゼーションを行った.観測データから得られたTKE flux係数αは,風向と波向との関係への依存性,さらに風向と波向が近い場合には弱い波形勾配に対する依 …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_61-I_66, 2019

    J-STAGE 

  • STUDY ON REFLECTION COEFFICIENT AT WAVE DISSIPATING STRUCTURE USING NUMERICAL MODELING  [in Japanese]

    OKAJIMA Riku , ARIKAWA Taro

    <p> 消波工の消波性能を評価する際,反射率に着目した断面実験が過去に多く行われている.しかし,実港湾においては,消波工に対して波が斜めに入射してくることも少なくなく,断面検討のみでは不十分と考えられる.一方で,平面水槽を使用した実験は,壁や造波板における反射により複数の波が干渉し合うため,正確な計測が困難であり,検討できる条件が限られる.本研究では,過去に行われた大型平面水槽による斜 …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_775-I_780, 2019

    J-STAGE 

  • Estimation of Wave Force Coefficients on Mangrove Models

    CHANG Che-Wei , MORI Nobuhito , TSURUTA Naoki , SUZUKI Kojiro

    … To provide a useful tool for the estimation of wave dissipation in the future model developments, the relationships between force (drag/inertia) coefficients and the flow parameters (i.e. Reynolds/Keulegan-Carpenter numbers) are presented.</p> …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_1105-I_1110, 2019

    J-STAGE 

  • Friction and Adsorption Properties of Oleic Acid-Based Gemini Amphiphile at Silica/Ester Oil Interfaces

    Sakai Kenichi , Ishimado Ryo , Takamatsu Yuichiro , Akamatsu Masaaki , Sakai Hideki

    … Quartz crystal microbalance with dissipation monitoring measurements suggested that the gemini amphiphile had greater adsorption capability than the two comparative amphiphiles. … These measurements confirmed that the gemini amphiphile had a smaller kinetic friction coefficient than that of the other two amphiphiles. …

    Journal of Oleo Science 68(6), 567-572, 2019

    J-STAGE 

  • ANALYTICAL STUDY ON SEISMIC RESPONSE OF REINFORCED CONCRETE BUILDINGS CONSIDERING P-Δ EFFECT  [in Japanese]

    YAMAKAWA Kouki , OTSUKA Yuri , ITO Miei , HIRAISHI Hisahiro

    … <p> The P-Δ effect caused by additional moment due to gravity load produces when the building responses by earthquakes, and produces the influence on the earthquake resistance properties particularly for buildings with a small base shear coefficient. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) 84(759), 685-694, 2019

    J-STAGE 

  • Adsorption and Desorption Characteristics of Sulfur-Type Extreme Pressure Agents on Aluminum-Based Substrates and Surface Composition Analysis of Their Thermally Treated Films  [in Japanese]

    SAKAI Kenichi , SUNAKAWA Kazuki , MATSUEDA Hironobu , SAKATA Hiroshi , AKAMATSU Masaaki , SAKAI Hideki

    … <p>We have characterized the adsorption and desorption behavior of a sulfur-type extreme-pressure (EP) agent at an aluminum-based substrate/dodecane interface by means of quartz crystal microbalance with dissipation monitoring (QCM-D) technique. … Ball-on-plate type friction measurements suggested that this product reduced significantly a dynamic friction coefficient. …

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS 64(2), 118-124, 2019

    J-STAGE 

  • <b>Numerical Investigation on the Sensitivity of Turbulence Statistics to Small Velocity Variations in Grid-Generated Turbulence based on </b><i><b>k</b></i><b>-</b><i><b>ε</b></i><b> model</b><b> </b>

    SHIKATA Yoshiaki , SUZUKI Hiroki , MOCHIZUKI Shinsuke

    … The relative effects of these small velocity variations on the turbulent kinetic energy, its dissipation, the length scales of the turbulence, the invariance of the turbulence, and the turbulent diffusion coefficient were examined. …

    Advanced Experimental Mechanics 3(0), 78-85, 2018

    J-STAGE 

  • Pioneering contributions by Eiichi Inoue and forerunners on the establishment of flux study

    HARAZONO Yoshinobu

    … The model provided the eddy-energy spectrum of -5/3 power law, by the assumption of the same energy dissipation among all ranks of eddies (Inoue, 1951, in Japanese). … Investigation of Honami with the model provided zero-plane displacement, roughness length, and the diffusion coefficient over plant canopy, resulted in establishment of the flux calculation method "Gradient Technique". …

    Climate in Biosphere 18(0), 115-123, 2018

    J-STAGE 

  • Model Predictive Control of a Separated Flow around a Circular Cylinder at a Low Reynolds Number

    SASAKI Yasuo , TSUBAKINO Daisuke

    … One corresponds to the viscous dissipation function, and the other is the deviation from the ideal potential flow. … Moreover, a clear reduction in a drag coefficient is also observed.</p> …

    SICE Journal of Control, Measurement, and System Integration 11(3), 154-159, 2018

    J-STAGE 

  • Basic Cell Size Dependence of Displacement for a Solvation Motor in a Lennard-Jones Solvent

    TOKUNAGA Ken , AKIYAMA Ryo

    <p>Solvation change induced by a chemical reaction can move a macromolecule in a specific direction. The hydrodynamic effect on a solvation motor was studied by using molecular …

    Journal of Computer Chemistry, Japan 17(1), 80-84, 2018

    J-STAGE 

  • Molecular Dynamics Study on Hydrogen Diffusion in Pd and Pd-Ag Alloys  [in Japanese]

    NISHIMURA Kenji , MIYAKE Koji

    … The diffusion coefficient of H in Pd is kept constant at H concentration less than 0.1, then increases with increasing H concentration until the phase transition occurs, and after reaching a maximum it decreases with increasing H concentration. … Moreover, our results indicate that the addition of Ag to Pd leads to the dissipation of the miscibility gap. … The diffusion coefficient of H in Pd-Ag alloys significantly decreases with increasing Ag concentration. …

    Journal of the Society of Materials Science, Japan 67(2), 235-241, 2018

    J-STAGE 

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