Materials Literature
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Electricity generated by nuclear power is now common in Japan. The present commercialized status of nuclear power generation technology has been established due to efforts of many engineers and also as a result of information accumulated from other advanced countries. Presently 23 percent of total electricity generate…
PreviousNext No AccessSEG Technical Program Expanded Abstracts 1989Recognizing EM ellipticity patterns with neural networksAuthors: Mary M. PoultonCharles E. GlassBen K. SternbergMary M. PoultonUniversity of Arizona, Lab for Advanced Subsurface Imaging (LASI), Charles E. GlassUniversity of Arizona, Lab for Advanced Su…
The relationship between the average coordination number and void fraction in a randomly packed system of uniform-sized spheres was investigated by four different kinds of computer simulated results to judge whether or not the coordination number could be uniquely estimated from the voidage. The relationship between t…
The structure of the remarkably uniform array of pores in surface coatings on aluminum has been investigated using X‐ray and neutron diffraction techniques. The almost hexagonally shaped cells make the films of interest for application in the field of synthetic membranes and as supports for active materials.
Hot hardness and dilation curves were measured and the associated X-ray studies were conducted on electroplated Ni-W alloys of 40, 44 and 51wt%W during heating at a rate of 1°C/min. The increase in hot hardness started at around 200°C, and softening began at about 600°C. The 44wt%W alloy showed the highest hot hardnes…
The rolling textures and microstructures developed in fine grained (2–5 μ m diam.) 70:30 brass are different to those found in coarser grained material. The {111}〈 u v w 〉 γ fibre usually found at medium reductions is not developed but the normal {110}〈112〉 texture still emerges at higher reductions. The microstructur…
An investigation is reported in which simple rib-knitted fabrics were constructed from lambswool yarn spun on ringframes and mules. The mechanical properties of these fabrics were then measured on the Kawabata range of instruments, and primary hand values (stiffness, smoothness, and fullness/softness) were calculated.…
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…