Materials Literature
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The steel material is used for various applications, and there are a lot of parts to which wear resistance is required. For instance, steel is used in gears and turbine braid exposed to high-speed fluid which contains fine particle. The austenitic stainless steel is excellent in corrosion resistance. However, because…
Oxy-fuel combustion is expected to be one of the promising systems on CO2 capture from pulverized-coal fired power plant, and enable the CO2 to be captured in a more cost-effective manner compared to other CO2 capture process with the power generation from the results of previous study. Some studies in this area are i…
Highly stretched polyethylene nanofibers are demonstrated to have thermal conductivities as high as ∼ 100 W/m.K along the fiber direction, which is comparable to many metals and is 3 orders of magnitude larger than the typical thermal conductivity of bulk polymers. The high thermal conductivity is attributed to the re…
NH4HSによる腐食は高濃度で異常な速さとなり，この腐食が懸念される水素化脱硫装置などの高圧設備では，腐食漏洩により大事故に至る可能性が高いため，設計段階で防食面の配慮が必要となる．空冷式熱交換器伝熱管気相部に発生した選択的なNH4HS腐食事例を基に，伝熱係数を考慮したNH4HS濃縮モデルを構築し，伝熱管各部位での気相凝縮部と液相部の温度とNH4HS濃度を解析した．その結果気相凝縮部は液相部よりも伝熱係数が大きく，高濃度のNH4HS水溶液が生成することが示された．実装置での腐食現象を定量的に表現することができただけでなく，NH4HSによる腐食が懸念される伝熱管の防食設計には，管のフローパターン，外気温度，気相凝縮部での推定NH4H…
A highly sensitive method is described for the determination of bismuth by differential pulse anodic stripping voltammetry after preliminary separation of iron matrix. Most of the iron in an acidic sample solution was removed by the 4-methyl-2-pentanone (MIBK) extraction method, and MIBK dissolving in the aqueous phas…
This paper describes the Young's modulus of thin films for electronic devices measured by a 3-points bending method. Materials tested were rolled copper, electrolytic copper, direct current plated copper and pulse plated copper and liquid crystal polymer films. Young's moduli were calculated from the difference in the…
カーボンナノチューブに代表されるナノカーボン素材は，非常に小さく軽量でありながら，熱的特性，力学特性，電気的・光学的特性で卓越した性能を有する．本研究ではナノカーボンの特徴をアスファルトに付加し新機能を発現させる目的で，アスファルト乳剤をバインダーとする複合材料（ナノカーボン入りのアスファルト乳剤）の開発を行った．結果，ノニオン系及びアニオン系乳剤についてはそのまま添加可能であり，カチオン系乳剤についてはナノカーボン内の残存触媒を酸で溶解する工程を追加することで添加可能であることがわかった．新機能の例として針入度及びマイクロ波吸収能の実験結果を示し，添加量が同量であれば，既存カーボンブラックに比べ高性能であることがわかった．
Hydrophobic Fe3O4 nanocrystals with superparamagnetic behavior were synthesized in an or- ganic solvent. High quality water-soluble Fe3O4 nanocrystals were then prepared by a phase transfer method, in which amphiphilic oligomers (polymaleic acid aliphatic amine ester) was used as surface coating agents. The obtained a…
In order to improve the efficiency of ultrasonic bonding process for a polymer Electro-Mechanical System(MEMS) and to prevent the flow of polymer under a high temperature,a micro energy director array was proposed.Based on the experiment of PMMA micro-pipe sealing,the influence of micro energy director array on the pr…
放射性廃棄物収納容器中に含まれるウラン放射能を定量する方法として，廃棄物密度が均一の条件で，不均一な線源分布とγ線計数率を線形関係で結ぶ評価モデルを導出した1)。この評価モデルにより，廃棄物容器内の密度が均一と見なすことが可能な状態については，線源分布状態によらず，ウラン放射能が定量可能であることを示した。一方，密度不均一，線源分布不均一の放射性廃棄物を収納した容器への適用は課題となっていた。このため，密度が不均一な廃棄物容器のγ線計測を，廃棄物容器の中心から等しい距離の3次元位置(球面)において多数点測定し，計測値を幾何平均して，密度不均一の放射性廃棄物から近似的に密度均一の状態を作り出す方法を考案した。この手法により，密度が不…
Watt’s nickel bath and nickel sulfamate bath are commonly applied for plating of micro-fabrication parts. In particular, the nickel sulfamate bath produces nickel plating with low residual stress and high tensile strength. Nickel sulfamate baths are therefore used extensively for electroforming and Micro Electro Mecha…
Strain monitoring of resin during cure process is an effective method to manufacture high-quality FRP products because it is known that residual stress generated during molding decreases strength of final products. Although both cure and thermal shrinkage occur during cure process, it is difficult to measure cure shri…
A high-speed water jet ejected into water forms a cavitating water jet accompanied with cavitation clouds in a periodic manner. A powerful impulsive force can be caused at collapse of an unsteady cavitation cloud when a cavitating water jet impinges against solid wall. In the present experiment, cavitation clouds are…
Magnesium matrix composites were fabricated with the help of a reaction between magnesium and silicon oxide (SiO2) powders. The specimens were prepared by two processing routes (a powder processing route and an infiltration route). The basic reaction behavior was investigated by heating compacted SiO2 and magnesium po…
A new phenomenological one-dimensional model is formulated to simulate the typical degradation patterns observed in Solid Oxide Fuel Cell (SOFC) anodes due to coal syngas contaminants such as arsenic (As) and phosphorous (P). The model includes gas phase diffusion and surface diffusion within the anode and the adsorpt…
The disused car scrap with the copper wire etc. is crushed together, and dissolved in an electric furnace. The removal of copper from the steel scrap that is thus inevitably contained high copper is difficult. Because the copper causes surface hot-shortness during hot rolling of steel, it is usually considered as a ha…
水溶液中のホウ素を除去するために，N-メチルグルカミン（NMG）を直径 25 μm のナイロン繊維にグラフト重合したポリグリシジルメタクリレート（ポリ GMA）鎖に固定した。1,4-ジオキサン，イソプロパノール，N,N-ジメチルアセトアミド，テトラヒドロフラン，およびジメチルスルホキシドの 5 種類の溶媒と水との混合溶媒を，NMG の固定のための反応溶媒として使用した。ジオキサンおよびイソプロパノールと水との体積分率を 8：2 とした混合溶媒を使って調製した 0.2 M NMG 溶液を使用したとき，ポリ GMA 鎖中のエポキシ基からキレート形成基へのモル固定化率はそれぞれ 74 および 68％ となった。NMG 基密度 1.9 m…
Thermal conductivity of the in-situ type AlN-Al-AlB12 ternary composite, which was synthesized with the aid of the exothermic reaction between molten Al and BN powder, has been studied. Although the thermal conductivity of this composite is certainly raised with an increase in AlN concentration, it significantly degen…
A model to solve the magnetostrictive coefficient of a Giant Magnetostrictive Film(GMF) was established to analyze the coupling relations of GMFs.Then,the building process,deduction mechanism and simulation results of the model were investigated.On the basis of magnetostrictive coefficient expression of a single layer…
Natural composites have been important materials system due to preservation of earth environments. Natural fibers such as jute, hemp, bagasse and so on are very good candidate of natural composites as reinforcements. On the other hand regarding matrix parts thermosetting polymer and thermoplastic polymer deriver form…