Materials Literature
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PLAの一次分解特性を解明するため,コンポスト化の発現し得る温度とpH範囲を考慮し,PLAの加水分解試験を行った.本研究での設定pH範囲において,高温試験区ほど加水分解による一次分解が促進され,分子量低下が著しかった.またpH 6.0～8.0間では,pHの違いが低分子化へ及ぼす影響は小さく,重量減も認められなかった.他方pH 9.0の高アルカリ領域では,早い段階から大幅な重量減少が認められた.また,試料断面の観察結果からPLAの加水分解は試料の表面から進行することが確認された.以上の知見から,コンポスト化過程でのダイナミックな温度,pH変化がPLAの一次分解を促進し,続く完全生分解を容易にすることが確かめられ,この特性が,実用分解…
High voltage insulators are essential for the reliable performance of electric power systems.All insulators, regardless o f their material, are exposed to various electrical, mechanical and environmental stresses.The electrical stresses are the consequences of regular voltages and overvoltages.The mechanical stresses…
Candidate materials for the hardened steel raceways in ceramic-ball hybrid bearings, as well as steel components for other advanced bearing designs, are being increasingly specified to be capable of attaining combinations of material properties that have not previously been required of traditional bearing steels such…
The program PowderCell is a crystallographic tool for visualization of Crystal structures. However, it offers also non-conventional features like the fulautomatical generation of subgroups or the consideration of non-standard settings of space-group types. On the one Hand the program is very useful for non-crystallogr…
The sulfur containing silanes [bis (triethoxysilylpropyl)tetrasulfide (TESPT) and bis(triethoxysilylpropyl)disulfide (TESPD)] and silica were compounded in the natural rubber (NR) and their effects with respect to the viscosity, heat generation, power consumption, vulcanization, dynamic, mechanical, heat build-up (HBU…
The change regulation of microflaw and phases constitution in the process of growth of ceramic coating formed by micro-arc oxidation on magnesium alloys and their influence on corrosion-resistance were studied by SEM, XRD and salt spray tests. The results show that in the initial stage of micro-arc oxidation the obtai…
The oxidation behavior of reduced CeO2 and CeO2-ZrO2 solid solution (CZS) was studied by measuring the weight and temperature change during oxidization, in the near-room-temperature range. A flaming oxidation at close to room temperature was observed in some of the reduced CZS. This oxidation takes place in the CZS re…
Grain boundary (GB) structures of Al nanopolycrystalline (NPC) materials and their mechanical properties are studied by using molecular dynamics simulation. An embedded atom method (Mishin et al. 1999) is adopted to describe the interatomic interaction. First, bicrystal models are studied to evaluate the GB energies,…
Delayed Hydride Cracking (DHC) in Zr-2.5 Nb alloy material is of interest to the CANDU industry in the context of the potential to initiate DHC at a blunt flaw in a CANDU reactor pressure tube. The material is susceptible to DHC when there is diffusion of hydrogen atoms to the flaw, precipitation of hydride platelets,…
A convenient preparation of phthalocyanines from phthalonitriles was accomplished by treatment with metal salts and hexamethyldisilazane (HMDS) in DMF at 100 °C. This reaction provides a new preparative method under mild conditions for phthalocyanines having a variety of metals and substituted phthalocyanines as well…
Two new homologous series, each consisting of 12 mesogens with isoamyloxy and isobutoxy branching terminal groups, have been synthesized, and their mesomorphic properties are studied. All the derivatives are mesomorphic in nature, with the lower members exhibiting nematic mesophase and the higher derivatives showing s…
Rapid thermal oxidation and quenching in liquid nitrogen (RTOQN) has been examined on anodized porous silicon (PS). The as-anodized PS samples exhibit a photoluminescence peak at 750 nm that decays instantaneously upon discontinuance of 325-nm He–Cd laser irradiation. In contrast, PS samples after RTOQN show a lumines…
The crystal structure of a newly synthesized compound Na2Ba2[B10O17(OH)2] has been determined (Syntex $$P\bar 1$$ diffractometer, MoK α radiation, 1784 crystallographically nonequivalent reflections, anisotropic approximation, R = 1.7%). The parameters of the monoclinic unit cell are a = 11.455(7), b = 6.675(4), c = 9…
A method for observing the liquid microstructure of beer has been developed to ascertain whether bubble nucleation is initiated from the beer itself. Observations were conducted under an electron microscope using specimens prepared by forming a thin-film replica of beer. Immediately after opening the bottle, microbubb…
The doped yttrium oxybromide (YOBr) phosphors were synthesized by a solid state reaction. The YOBr:Eu phosphor showed a strong and narrow red emission band at 621 nm and maximum emission intensity was obtained when 0.05 mol ion was doped. The luminescent properties of a YOBr:Eu phosphor were investigated by photolumin…
Three-layer structures made of concrete-type materials usually have an internal layer of a less strength, which serves as thermal insulation and makes the structure more light. Therefore cracks may appear in the internal layer of a bended structure earlier than in the external tensile layer. This paper deals with an i…
We formulate a novel method of characterizing optically transparent substances using dispersion theory. The refractive index is given by a generalized Cauchy dispersion equation with coefficients that are moments of the uv and ir absorptions. Mean dispersion, Abbé number, and partial dispersion are combinations of the…
We report observation of the dynamic enhancement of photorefractive effect in dye-doped nematic liquid crystal in the presence of an applied ac electric field. The multi-wave mixing efficiency in a planar cell with photoconductive orienting layers has been increased by two orders.
Heparinization is believed to be one of the methods to suppress thrombus formation on blood-contacting surfaces. However, this study hypothesizes that heparinization alone might not be sufficient to provide a blood-compatible surface; that is, a surface property that resists biofouling is necessary to obtain an effect…
Dynamically vulcanized poly(vinyl chloride)/epoxidized natural rubber (PVC/ENR) thermoplastic elastomers (TPEs) were prepared following a semi-efficient vulcanization system (semi-EV) with the incorporation of di-ethylhexyl phthalate (DOP) as a plasticizer. The PVC/ENR TPEs were melt mixed at 150°C and 50 rpm using a…