Materials Literature
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Block copolymers of poly(ethersulphone) (PES) oligomers with liquid crystalline polyester units were synthesized by the reaction of dihydroxy-terminated poly(ether sulphone) oligomers (number-average molecular weights: 704, 1,158 and 2570) and terephthaloyl bis(4-oxybenzoyl chloride), and their properties were investi…
The R D of hydrogen absorbing alloys in Japan started in the early 1970s.Many alloys such as TiMm1.5 based alloys, Fe-Ti-O alloys (e.g. FeTi1.15 O0.024) andthe(mischmetal)Ni5 based alloys (e.g. MmNi4.5 Cr0.46 Mn0.04) were developed by the early 1980s. The application of these alloys to hydrogen storage, heat storage,…
The corrosion behavior of Ti-(0-40)mass%Mo alloys prepared through P/M technology was studied by corrosion test and electrochemical measurements. The corrosion rate of sintered Ti-Mo alloys in 35% HCl solution decreased remarkably with increasing molybdenum content. The corrosion rate of Ti-40mass%Mo alloy, for exampl…
Abstract The crystal structure of poly(aryl ether biphenyl ether ketone ketone) (PEDEKK) was determined to comprise a two‐chain orthorhombic unit cell with dimensions a = 0.778 nm, b = 0.606 nm and c = 2.375 nm by using wide‐angle X‐ray diffraction (WAXD). According to the orthorhombic system, the 12 reflections of th…
A new hot-forming process has been studied to produce anisotropic Nd-Fe-B-based magnets from melt-spun ribbons. The ribbon fragments were inserted in a Cu tube and hot-deformed together with one-stroke. At a height reduction ratio of 0.44, the melt-spun ribbons were densified into a magnet with a density of 7.14 g/cm/…
The study, using bacterial collagenase, was to investigate the changes in characteristics of a collagen-rich tissue, porcine pericardium, fixed by glutaraldehyde or epoxy compound (ethylene glycol diglycidyl ether) during the course of degradation. Fresh porcine pericardium was used as a control. During degradation, t…
Orthorhombic Li2MgSiO4 in which all the cations lie in tetrahedral sites can incorporate large amount of Cr4+ ions.Cr4+:Li2MgSiO4 exhibits broad-band fluorescence around 1.2 μm, with fluorescence lifetime exceeding 100 μs at room temperature. This is the longest lifetime reported so far for a tetrahedral Cr4+ doped co…
The wear mechanisms of a 3% mol yttria stabilized tetragonal zirconia ceramics (TZP)/52100 steel reciprocating sliding couple under water lubrication were investigated in this paper. The wide ranges of normal loads and sliding speeds were chosen in order to study the relationship between the tribological performance o…
Two tetra(alkylsilsesquisulfides) (R4Si4S6, R=t-Bu, 1,1,2-trimethylpropyl) were synthesized. The structures were determined by X-ray crystallography and novel “double decker”-type structure was revealed for tetrakis((1,1,2-trimethylpropyl)-silsesquisulfide).
In order to effectively utilize the fish and squid skin wastes derived from marine processing manufacture, the skin wastes of some pelagic fishes such as yellowfin sole, red cod, cod, Allaska pollack and flying squid were screened for the raw material of edible gelatin and studied some properties of those gelatins. Th…
Effect of interfacial roughness between YSZ (ZrO 2 •8molY 2 O 3 ) electrolyte membrane and Ni-YSZ cermet anode layer, and LSM (La 0.85 Sr 0.15 MnO 3 ) cathode layer on the electrochemical reaction was investigated by sintering the above mentioned electrode layers on each side of the roughened surfaces of the electroly…
Minimal spanning tree has been applied to the analysis for spatial point distribution pattern of microstructures. The technical remarks on the analysis have been examined by using generated model patterns of square lattice, triangle lattice square inhibition and triangle inhibition models. The number of sample points…
The hot corrosion resistance of twelve Ni-base alloys was evaluated at 873 K by three different laboratory tests; immersion test, salt coating test and embedding test. In these tests, three different corrosion ashes were employed, a sulfate (Na2SO4-K2SO4-ZnSO4), a chloride (NaCl-KCl-LiCl-CaCl2) and a chloride/sulfate…
SummaryMagnesium hydroxide is shown to dehydrate endothermically to magnesium oxide over a similar temperature range to that of the thermal degradation of polyamide. The extent of dehydration in plasma spraying is shown to be a function of particle size. However the research indicates that the use of magnesium hydroxi…
Thermal properties of smectic liquid crystals of dimyristoylphosphatidylglycerol sodium salt (DMPG) in water were investigated as a function of temperature above the gel-liquid crystal transition temperature, Tm, by X-ray diffraction analysis of the repeat distance of the bilayer, differential scanning calorimetry (DS…
かさ高いエステル基を有する1, 2-ジ置換モノマーであるフマル酸ジイソプロピル (DiPF) と各種ビニルモノマーとのラジカル共重合性の検討を行い, さらにスチレン (St), 酢酸ビニル (VAc), 塩化ビニル (VC) との共重合体においては極限粘度, 熱的性質についても調べた. 共重合は, AIBNを開始剤に用い, 60℃の重合温度で行った. 共重合体は, St, VAc, アクリロニトル, イソブチレン, 1, 3-ブタジエン, VCでは得られたが, メタクリル酸メチルとメタクリル酸では得られなかった. St, VAc, VCとの共重合では, DiPFの組成が約5mol%以内で重合収率に影響はなく, St, VAcでは極…
We discuss, with illustrations drawn from the simple example of a dielectric grating under total internal reflection illumination, the use of electric field, energy density and Poynting vector as tools for understanding phenomena associated with dielectric gratings. The electric field has greatest direct observational…
An optimization procedure for designing a ceramic tensile creep specimen to minimize stress concentration is carried out using a finite element method. The effect of pin loading and the specimen geometry are considered in the stress distribution calculations. A growing contact zone between the pin and the specimen has…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
An X-ray diffraction (XRD) investigation was undertaken to clarify the processes occurring during the oxidation of ferrosilicon and silicon carbide in the presence of lanthanum oxide, with the aim of optimising the technique to give a product that is easy to fuse with lithium tetraborate into a bead suitable for X-ray…