Materials Literature
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Measurements of specific heat in the temperature range 1–40 K for four chalcogen amorphous alloys (Se1-x-Tex)1-ySby and of thermal conductivity for three samples of superionic glasses (AgI)x (Ag2O2B2O3)1-x between 1 and 10 K are reported. The anomalous measured specific heat is interpreted in terms of phonon localizat…
The conductivity and mechanism of oxygen-ion transport in 20 mole % erbia-stabilized bismuth oxide (ESB) was investigated using AC impedance spectroscopy and an equivalent circuit for oxygen-ion transport is described. A change in the slope of conductivity vs. reciprocal temperature, at ∼600°C, indicating two differen…
Les matériaux composites formés d’une matrice polymère conducteur électronique, PCE, interpénétrée par celle d’un autre composant, peuvent être classés, en simplifiant, en deux catégories, selon que le composant partenaire est un polymère plastique isolant (chlorure de poly(vinyle), alcool polyvinylique, plexiglas,...…
Foaming heights, when an Ar gas was blown into some binary oxide melts in the systems Na2O-P2O5, BaO-B2O3, Na2O3-B2O3 and Na2O-SiO2 through a platinum sapillary, were measured to evaluate the foaminess. The maximum foaminess was observed for 17.8 mol% BaO-82.8 mol% B2O3 melt at 1 000°C, that lies near the two-liquid p…
Mg(OH)2 particles of hexagonal plate and prism are prepared by hydration of magnesia clinker in magnesium salt solution. The hydration mechanism of magnesia was investigated by measuring reaction rates and SEM observations. The hydration rate was proportional to the surface area of MgO particles, suggesting that the r…
In order to study the characteristics of static strength of ceramics, 3-point bending tests with a constant loading rate were carried out at room temperature in air, by using sintered silicon nitride, partially stabilized zirconia and two kinds of alumina. The effects of specimen geometry and temperature on the streng…
Abstract Die mit Tonerde katalysierte Oligomerisation von ungesättigten Fettsäuren ergibt C36‐Dimerfettsäuren, C54‐Trimerfettsäuren und C18‐Monomerfettsäuren. Letztere bestehen aus einer Mischung von geradkettigen, verzweigten, gesättigten und ungesättigten Fettsäuren, die nach Hydrierung der Doppelbindungen in eine f…
An approximate theoretical analysis of the cantilever stiffness test is presented. This yields convenient formulae for calculating the bending parameters of fabrics. The formulae show good agreement with Peirce's empirical equation and reasonable agreement with Grosberg and Swani's graphical method.
Hydrogen disbonding of stainless clad steels was examined by "in-situ detection method", which is composed of ultrasonic wave inspection and cathodic hydrogen charging. Disbonding cracks occurred in the hard martensitic layers in the interface region between high alloy and carbon steel. Ni and Cr in the high alloy dif…
1～4個のα-ジアゾベンジル基を組み込んだテトラフェニルポルフィリンを合成し,光分解により対応するカルベンを発生させた。得られたカルベンーポルフィリンについて,電子スペクトルおよびESRスペクトルの測定を行った。微細構造シグナル強度の10～50K領域における温度依存の実験からピス体における二つの異性体のうち,syn-体では,2個のカルベンがポルフィリン環を通して強磁性的に相互作用して,基底五重項種が生成し,一方,anti-体では反強磁性的相互作用により基底一重項種が生成していることが明らかとなった。
Precursor fibers for MxOy (M=Al, Ti, Zr) were prepared by a new method via polymetalloxanes (PMO) prepared by hydrolytic polycondensation of chelate complexes of aluminium, titanium and zirconium. The chelates were prepared by the reaction of corresponding metal iso-propoxides with ethyl acetoacetate. A solution of PM…
The anisotropic magnetoresistance effect of Permalloy (Ni/sub 0.82/Fe/sub 0.18/) is used in a contactless angle detector. The uniaxial magnetic anisotropy in a Permalloy thin film causes a difference between the direction of magnetization and the magnetic field direction. This leads to a systematic error in the angle…
Breakdown phenomena of gas-insulated gaps with nanosecond pulses were examined under the spot illumination of the ultraviolet rays on the cathode surface in the atmospheric gases such as air, N2, and O2. Our investigation reveals that the 50% probability of flashover voltage obtained under the spot illumination of the…
Abstract Solubility data for Belle Fourche montmorillonite plotted on 2pH — pMg 2+ vs. pSi (OH) 0 4 axes, demonstrate that the monophase model can accurately represent smectite formulas in hydrolysis reactions. The smectite was equilibrated with gibbsite and goethite over a pH range of 3.26 to 8.16. Equilibration was…
Abstract Dynamic mechanical experiments were carried out on a series of polyether block amide copolymers based on poly(tetramethylene oxide) and polyamide 12 with varying PE/PA weight ratio. Internal friction spectra exhibited three main peaks related to the subglass transition of the soft segments, the glass transiti…
Crystal structure refinement ( R = 0.057 for 811 observed reflections) based on neutron diffraction data of a strontian piemontite (S. Marcel, Italy), with unit cell a = 8.884(3) Å, b = 5.684(1) Å, c = 10.202(3) Å), β = 115.23(2)°, lead to the following crystallochemical formula: Ca(Ca 0.84 Sr 0.16 ) (Al 0.81 Mn 0.17…
Single crystals of tertiary-butyl-alcohol (TBA) have been grown by a zone refining technique. A review of the phases and the properties of TBA crystals is presented. The crystal structure of phase IV has been determined at 295 K: space group P [unk], a = 6.393(2), b = 9.481(3), c = 15.126(4) Å, α = 85.47(2)°, β = 79.6…
It was previously shown that among fishes in the suborder Salmonoidei, chum salmon and rainbow trout which belong to Salmonidae possessed the skin Type I collagens with a subunit composition of α1α2α3, contrasted to the collagen with (α1)2α2 of ayu which belongs to Plecoglossidae. In this study, soluble skin and/or mu…
The moisture sorption isotherm was determined primarily at 30°C for fifteen kinds of wool and hair fibers from sheep, goat, camel, and rabbit families. The isotherm was analyzed in terms of Brunauer, Emmett and Teller (B. E. T.)'s parameters: C (adsorptive energy factor), vm (maximum volume of adsorbed water in monola…
[Au8Cl2(PPh3)6 Rh(CNC8H9)2](PF6) has been synthesised by the NaBH4 reduction of a mixture of Au(PPh3)Cl and Rh(CNC8H9)3Cl, and a single crystal X-ray study has shown that it has a hemispherical geometry of gold atoms based on an icosahedron, with the rhodium atom occupying the centre of the open face and bonded to all…