Search Results 1-20 of 8714

  • Displacement speed statistics in an open turbulent jet spray flame

    Malkeson S.P. , Ahmed U. , Turquand d'Auzay C. , Pillai A.L. , Chakraborty N. , Kurose Ryoichi

    … The components of displacement speed arising from chemical reaction rate and flame normal molecular diffusion remain leading order contributors and the competition between these determines the mean behaviour of displacement speed. … However, the modelling methodologies, which implicitly assume equality between the surface-weighted values of density-weighted displacement speed and local laminar burning velocity, might be rendered invalid for turbulent spray flames. …

    Fuel 286(1), 2021-02-15

    IR 

  • Effects of Residual Stress on Hydrogen Embrittlement of a Stretch-Formed Tempered Martensitic Steel Sheet  [in Japanese]

    Nishimura Hayato , Akiyama Eiji , Hojo Tomohiko , Ajito Saya , Shibayama Yuki , Koyama Motomichi , Saitoh Hiroyuki , Shiro Ayumi , Yasuda Ryo , Shobu Takahisa

    … The mixture of quasi cleavage and intergranular fractures were observed whole through the fracture surface. … It was considered that the preferential crack initiation at the foot was promoted by the high residual stress in the circumferential direction and the hydrogen accumulation due to stress-induced diffusion.</p> …

    Tetsu-to-Hagane, 2021

    J-STAGE 

  • Quasielastic Neutron Scattering for Analyzing Transport Dynamics of Chemically-Bound Hydrogen in Minerals  [in Japanese]

    OKUCHI Takuo

    … The former observed at ≥ 230 K is ascribed to surface diffusion within basal planes of brucite grains, while the latter observed at 430 K is ascribed to proton conduction through the interior of the grains. …

    Nihon Kessho Gakkaishi 63(2), 129-134, 2021

    J-STAGE 

  • Characteristics of High Speed Steel/ductile Cast Iron Composite Roll Manufactured by Electroslag Remelting Cladding

    Cao Yulong , Dong Yanwu , Jiang Zhouhua , Li Guangqiang , Zhao Zhengrong

    … The obtained results illustrated that the chemical composition of the cladding layer (HSS) changed dramatically due to the surface melting of the roll core (DCI) and the mechanical mixing of the bimetallic liquids. … In addition, a bimetallic transition zone (about 9.47 mm) was generated between the HSS layer and the DCI core due to the elemental migration and diffusion between the bimetals. …

    ISIJ International, 2021

    J-STAGE 

  • Cell-surface Initial Aggregation Process of Amyloid-β Peptides Studied by Fluorescence Correlation Spectroscopy  [in Japanese]

    Yano Yoshiaki

    … Fluorescence correlation spectroscopy (FCS) is a sensitive method to monitor molecular aggregation processes by measuring diffusion of fluorophore-labeled molecules. … These results indicate the usefulness of FCS detection of small Aβ oligomers formed on cell surface, which can act as pathogenic seeds for amyloid fibrils responsible for neurotoxicity.</p> …

    YAKUGAKU ZASSHI 141(6), 825-829, 2021

    J-STAGE 

  • Simulation of Experimental Deuterium Retention in Tungsten under Periodic Deuterium Plasma Irradiation

    OYA Makoto , HARA Yuki , KATAYAMA Kazunari , OHYA Kaoru

    … <p>To study the effect of periodic plasma irradiation on deuterium (D) retention in tungsten (W), an irradiation experiment with low-energy (50 eV) and high-flux (∼10<sup>22 </sup>m<sup>−2 </sup>s<sup>−1</sup>) ions was simulated through the coupling with collision and diffusion processes of injected D atoms. …

    Plasma and Fusion Research 16(0), 2405057-2405057, 2021

    J-STAGE 

  • Electrokinetic Phenomena of Hydrophobic Particles with a Slip Surface  [in Japanese]

    Ohshima Hiroyuki

    … <p>The theory is reviewed of the electrokinetics of spherical solid colloidal particles with a slip surface in an aqueous electrolyte solution. … The limiting case of zero slipping length corresponds to a hydrophilic surface. … The slipping length increases as the hydrophobicity of the particle surface increases. …

    Journal of the Society of Powder Technology, Japan 58(4), 186-192, 2021

    J-STAGE 

  • Rapid Evaluation of Hydrogen Embrittlement Resistance for Spot-Welds of High Tensile Strength Steel Sheet by Slow Rate Tensile Shear Test under Hydrogen Charging Conditions

    Kitahara Gaku , Matsuoka Hideaki , Asada Takashi

    … The quasi-cleavage fracture surface and intergranular fracture surface were observed at the nugget and inside the crack generated at the nugget-heat affected zone interface. …

    MATERIALS TRANSACTIONS, 2021

    J-STAGE 

  • Ageing Model of Rubber O-Rings Used in Gas-Insulated Substation Equipment  [in Japanese]

    Minagawa Tadao , Hatanaka Yasumichi , Oyanagi Yosuke , Okita Erika , Yasuda Masahiro

    <p>変圧器や開閉器等,ガス絶縁機器に適用されるOリングについて,ガスシール性能の長期的信頼性を評価するため,クロロプレンOリングの加速劣化試験におけるゴム特性の変化を測定し,その劣化過程を考察した.加速劣化試験において,ゴム硬度の上昇および引張破断強度の低下と引張伸びの低下には,使用雰囲気中の酸素が強く影響し,さらにはOリングと酸素との接触面積の大きさと劣化速度に一次の相関性のあるこ …

    KAGAKU KOGAKU RONBUNSHU 47(3), 69-75, 2021

    J-STAGE 

  • Oxidation Reaction Kinetics on Transition Metal Surfaces Observed by Real-time Photoelectron Spectroscopy  [in Japanese]

    OGAWA Shuichi , ZHANG Bingruo , YOSHIGOE Akitaka , TAKAKUWA Yuji

    … After the Ti(0001) surface was wholly covered by TiO with a thickness of 1.2 nm, the rapid growth of n-type TiO<sub>2</sub> … proceeded through the diffusion of Ti<sup>4+</sup> … surface at 400℃. … A saturation of oxygen uptake on the TiO surface indicates that the O<sub>2</sub> …

    Vacuum and Surface Science 64(5), 218-223, 2021

    J-STAGE 

  • Stem and Branch Respiration in Trees::Monitoring CO<sub>2</sub> Efflux on Organ Surfaces to Understand the Internal Process for Respiration  [in Japanese]

    Iio Atsuhiro

    <p>森林バイオマスの大部分を占める樹木の幹枝の呼吸は,炭素循環の重要な一要素であり,その定量には器官表面で測定されたCO<sub>2</sub>放出速度(<i>E</i><sub>A</sub>)が用いられてきた。しかし,幹や太い枝,粗根など,厚い木部をもつ器官では,内部の温度やO<sub>2< …

    Journal of the Japanese Forest Society 103(1), 53-64, 2021

    J-STAGE 

  • Analysis of Salinity Behavior in Hakata Bay after Heavy Rainfall Using a Three-dimensional <i>σ</i>-Coordinate Model

    FUKUDA Akihiro , TABATA Toshinori , HIRAMATSU Kazuaki , HARADA Masayoshi

    … Tank models were applied to calculate river inflow discharges, which were considered river inflow in the hydrodynamic and salinity diffusion model for Hakata Bay. … 28.0 psu) spread across the surface of the inner part of the bay; … and (3) salinity differences between the surface and bottom were large (approximately 4 psu) and lasted three days after the heavy rainfall. …

    Japan Agricultural Research Quarterly: JARQ 55(2), 137-146, 2021

    J-STAGE 

  • Solute Distribution of <i>α</i>-Al Dendrite in Al-Si and Al-Cu Binary Aluminum Alloys During Solidification and Cooling Process  [in Japanese]

    Minoura Takuma , Yaokawa Jun , Iwahori Hiroaki , Aoki Yuko , Iwai Mina , Dong Shuxin , Iwata Yasushi

    … The Si distribution in the dendrites of the specimens water-quenched during primary solidification showed that Si concentration declined from the surface toward the center of the dendrite. … In contrast, the specimens water-quenched after eutectic solidification or air-cooled from melt to room temperature showed that Si concentration increased from the surface toward the center of the dendrite. …

    Journal of Japan Foundry Engineering Society 93(4), 169-175, 2021

    J-STAGE 

  • Prevention of detachment of intra-operatively obtained frozen HE specimens of mammary margin from glass slides  [in Japanese]

    WATANABE Takuya , TATSUMI Shigenobu , AZUMA Chiharu , SUZUKI Hisae , TAKEUCHI Mao , MORIKAWA Sawako , MATSUO Kaoru , NISHIKAWA Takeshi

    <p>標本とスライドガラスの接着についての検討から,乳腺断端術中凍結HE標本における組織切片の剥離防止法の確立を試みた。接着の検討には,組織パラフィン切片及び細胞診残余材料を用いて,剥離防止コートスライドガラスとの接着に関する検討を行った。その結果,染色に耐えうる標本の接着を得るためには,パラフィン組織切片は水で濡れることが必要で,かつ,パラフィン組織切片及び細胞診標本とも,剥離防止コ …

    Japanese Journal of Medical Technology 70(2), 252-259, 2021

    J-STAGE 

  • Effects of Alloying Elements on Microstructure, Hardness and Growth Rate of Compound Layer in Gaseous-Nitrided Ferritic Alloys

    Meng Fanhui , Miyamoto Goro , Furuhara Tadashi

    … In pure iron, ε and γ′ (beneath ε) form on the surface, and voids form along the interface. … However, in the case of Al-added specimen, the growth layer becomes sluggish at longer nitriding time, presumably because of the extensive precipitation of AlN into the diffusion layer.</p><p> </p><p>This Paper was Originally Published in Japanese in Netsu-shori <b>59</b> …

    MATERIALS TRANSACTIONS 62(5), 596-602, 2021

    J-STAGE 

  • Mass Transfer of Ni in Liquid Li Detected by Quartz Crystal Microbalance

    IIZUKA Leo , KONDO Masatoshi

    … Austenitic steels corrode due to the preferential depletion of Ni from their surface in liquid Li. … The diffusion coefficient of Ni in static Li at 473 K was in the range between 1.13 × 10<sup>−10 </sup>and 5.10 × 10<sup>−10 </sup>m<sup>2</sup>/s by the model evaluation based on the Fick's second law. … The diffusion coefficient at 523 K was in the range between 1.90 × 10<sup>−10 </sup>and 6.87 × 10<sup>−10</sup> …

    Plasma and Fusion Research 16(0), 2405026-2405026, 2021

    J-STAGE 

  • Influence of Fluid Motion on Evaporation in Drying Process and Estimation of the Evaporation Rate  [in Japanese]

    Ono Takahiro , Suzuki Daisuke , Sato Keisuke , Ono Naoki

    … <p>A hot air drying technique, which is widely used in the production of coating materials, was studied by using experiments and numerical analysis about the surface liquid flow and the evaporation rate. … The influence of liquid surface flow on the drying rate was investigated by experiments on liquid film of 100 mm square and of 0.2 mm thickness, and the influence was found to be very small. …

    Seikei-Kakou 33(4), 135-141, 2021

    J-STAGE 

  • Is Oxygen Diffusion Faster in Bulk CeO<sub>2</sub> or on a (111)-CeO<sub>2</sub> Surface? A Theoretical Study

    Sakti Aditya Wibawa , Chou Chien-Pin , Nishimura Yoshifumi , Nakai Hiromi

    … Oxygen diffusion can occur once the oxygen vacancy is created, and it leads to enhanced catalytic activity. … In this study, the density-functional tight-binding method was used to estimate the free-energy barriers of oxygen diffusion in bulk CeO<sub>2</sub> … surface. … The reconstructed free-energy surfaces from metadynamics sampling show that the diffusion in the bulk CeO<sub>2</sub> …

    Chemistry Letters 50(4), 568-571, 2021

    J-STAGE 

  • Proposition of Thermal-Diffusion-Induced Spiral Model for the Rapid Oil-Film Breakdown Process during Scuffing

    Tohyama Mamoru , Izumi Takashi , Sanda Shuzo

    … <p>The dominant factors and processes for the rapid progression of scuffing from a partial area to an entire surface under lubricated, plane contact, and pure sliding conditions were studied by performing an <i>in situ</i> … observation of the surface, and <i>in situ</i> … Transitions of the oil-film thickness were measured using three-wavelength optical interferometry, and the temperature distributions of the sliding surface were measured using thermography. …

    Tribology Online 16(2), 89-98, 2021

    J-STAGE 

  • Analysis for the Growth and Stability of Bubble Nuclei in High-Intensity Focused Ultrasound Fields  [in Japanese]

    SHINKAI Yuki , ISHIDA Shoma , OGASAWARA Toshiyuki , TAKAHIRA Hiroyuki

    … over which the bubble grows explosively, is calculated using the dynamical equation of motion for a spherical bubble in which the liquid compressibility and the thermal diffusion through the bubble interface are taken into consideration. … The results also show that temperature dependency of surface tension is a key factor to determine <i>R</i><sub>0min</sub>.</p> …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 35(1), 28-35, 2021

    J-STAGE 

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