Materials Literature
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Microstructural evolution taking place in pure copper during multi-directional forging (MDF) at 77 K and 300 K was studied. Samples were deformed up to total strain of 6.0 at maximum. At 300 K, the flow curve showed a rapid increase in flow stress at the early stage of deformation followed by steady-state flow at stra…
In many cases that shape memory alloys are applied to engineering and medical fields, it is necessary to deform them in martensitic phase and after that, to recover them by heating. However, if a slip-deformation occurs, a shape recovery does not occur completely even if heated up above a reverse transformation finish…
This paper deals with the environmentally assisted cracking behavior of high strength cable wires of a suspension bridge, expos ed to marine environments. The main objective is to determine the safety of a bridge system locally and globally. To evaluate the safety of a suspension bridge, an ultimate limit state for th…
空気リークは吸収式冷凍機本体の腐食トラブルの主原因と考えられている. 本報では, 空気リークシステムを有する20冷凍トン吸収式冷凍機本体を用いて, 空気リークを模擬した腐食加速試験を実施した. 空気リーク速度を変化させ, 冷凍機内の溶存酸素濃度変化および機内LiBr溶液及び冷媒中の炭素鋼及び銅の腐食生成物 (イオンおよび酸化物) の濃度変化を測定した.一方, 種々のインヒビターを含むLiBr溶液中で炭素鋼の腐食電位上昇に及ぼす温度, 溶存酸素および銅イオン濃度の影響を検討した. また, 種々の温度において, アノード分極曲線より炭素鋼の孔食電位を決定した. 腐食電位の上昇挙動と孔食電位の関係から, 炭素鋼の腐食損傷加速に及ぼす影響…
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This study aims to clarify the influence of cup-stand materials on clothing pressure, compressive feeling, silhouette evaluation and physiological responses (heart rate and blood pressure). We conducted wearing tests of pushup type brassieres of which cup-stand materials have different tensile resistances. This includ…
小角中性子散乱 (SANS) はゲルの構造研究に非常に適した研究手段であり, 約四半世紀の歴史をもつ. そこでSANSによる高分子ゲルの構造研究の発展をゲルの不均一性とミクロ相分離の理解を中心に概説した. ゲルの散乱関数には不均一性の寄与を考慮することが不可欠であり, それには現象論的記述や統計力学による架橋点分布を考慮した理論などが提案されていることを示した. そして, そうした理論を使って環境敏感型ゲルの構造解析を行い, 温度や解離による構造変化の分子論的解明を行った例のいくつかを紹介した. さらに, スーパーゲルと呼ぶべき優れた力学的性質をもつゲルの構造解析と変形メカニズムの解明, 環境敏感型ヒドロゲルの圧力・温度誘起相分離…
Low temperature superplasticity was studied in a fine-grained magnesium alloy AZ31 which was processed by multi-directional forging (MDF) under decreasing temperature conditions. Tensile specimens were machined from MDFed Mg alloy parallel to the final compression axis. Tensile tests were carried out at temperatures f…
A 52-year-old woman physician developed recurrent erythema multiforme. Occupational and environmental exposure assessment suggested a disinfectant containing polyhexamethylenebiguanide hydrochloride (PHMB), Phagosept. Elimination of the product was followed by disappearance of symptomatology. Literature search reveale…
Most reliability issues in interconnect systems occur at a local scale and many of them include the local build‐up of stresses. Typical failure mechanisms are electromigration and stress voiding in interconnect lines and fatigue in surface acoustic wave devices. Thus a local probe is required for the investigation of…
Abstract. Mn0.67Zn0.33Fe2O4 nanoparticles with size ranging from 20 to 80 nm have been synthesized using the modified oxidation method. The Curie temperatures for all the samples are found to be within 630 ± 5 K suggesting that there is no size-dependent cation distribution. Mössbauer studies on the synthesized nanopa…
Silicone vulcanizates were obtained by crosslinking of poly(dimethyl-siloxane-a,w-diols) (Polastosil, Table 1) with poly[(methyl, phenyl) hydrosiloxanes] (PMHS, PMFHS) of different functionality (Table 2) in the presence of tin catalyst: dibutyltin dilaurate (DBTL). PMHS and PMFHS of linear and branched random structu…
Copper nanowires have been synthesized using potentiostatic electrodeposition within the confined nanochannels of a porous ion-crafted membrane. Morphology of electrodeposited copper nanowires has been studied using scanning electron microscopy. These nanowires have uniform diameters of about 100 nm, which corresponds…
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Mg alloys have been widely used in automobile and electronic industries because of high specific strength, good castability, etc.However, molten Mg alloys will burn rapidly in air if not protected.To solve this problem, the molten metal should be protected from oxidation by blanketing the surface with flux or protecti…
Si3N4/SiO2 composites were prepared with pressureless sintering. It was found that the Si3N4 particle was effective to suppress the crystallization of cristobalite in the Si3N4/SiO2 composites and contributed to the improvement of the mechanical properties. After sintered at 1370℃for 2h, the flexural strength of the c…
Carbon nanotubes(CNTs) supporting ferric oxide(Fe_2O_3) as composite nano-particles catalyst was prepared by the liquid phase precipitation method,and was characterized by transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS).The effect of Fe_2O_3/CNTs composite nano-particles catalyst on the…
Insulators’ icing is one of the severe problems for external insulation of transmission lines and there are a lot of reports about power outages caused by flashover of the ice-covered insulators from all over the world. Therefore, it is very significant to investigate the icing process and the icing performances of in…
Types of fouling in heat exchanger and their affected factors are summarized.Some usual cleaning methods are analyzed.
The effect of flow behavior on degradation of de-NOx catalyst is experimentally and numerically investigated. The de-NOx rate for used catalysts is evaluated using laboratory-scale test apparatus. and the flow behavior in a honeycomb rectangular tube of the catalyst is studied by direct numerical simulations (DNS). Th…