Materials Literature
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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…
The structures of the Werner clathrates with the host complex [Ni(NCS)2(4-Phpy)4](4-Phpy = 4-phenylpyridine) and mixed guests (4-phenylpyridine + dimethyl sulphoxide), (4-phenylpyridine + 2-methoxyethanol), and (phenylacetylene + dimethyl sulphoxide) have been elucidated. The packing of these three complexes has been…
The various approaches proposed so far to describe the atomic structure of quasicrystals are discussed together with some of the descriptions of the newly observed defects in these structures.
According to Albert Szent-Gyorgyi, ‘Discovery consists of looking at the same thing as everyone else and thinking something different.’ The ideas and suggestions presented in this chapter do not quite satisfy Szent-Gyorgyi’s paradigm, since some new facts were added to the older data. However, the previously available…
Abstract The major processes of the pulp and paper industry are overviewed with particular emphasis given to existing chemical requirements; processing trends are identified which may affect future chemical requirements. The pulp and paper industry represents a vast market for chemicals. On the papermaking side, overa…
A study is reported in which fancy yarns were made by the wrap-spinning process with a range of machine conditions and fibre supplies. The initial exploration identified the important control parameters and showed up characteristic yarn features. A particular bouclé-derivative yarn was especially interesting and was t…