Materials Literature
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Abstract A method is presented for inverting the Fredholm integral equations of the first kind that arise in many experimental determinations of molecular weight distributions of high polymers. The well known problems of instability and nonuniqueness are minimized by constraining the distribution to be the smoothest n…
Ordered phases in Pd‐rich Pd‐Mn system were investigated by means of selected area electron diffraction and X‐ray powder diffraction methods. The stability range of the periodic one‐dimensional antiphase structure Pd3Mn on the equilibrium phase diagram and the composition and temperature dependence of antiphase domain…
FCC結晶粒よりなる多結晶板モデルを用いて,増分的結晶弾塑性有限要素法により,各種比例負荷下の応力-ひずみ曲線,等ひずみ曲線,後続降伏曲線,繰り返し負荷下のヒステリシスループの形成,идьюшннの遅れ現象,ひずみ経路急変直後の応力-ひずみ曲線の異常挙動(一時低下),およびメカニカルラチェット現象といった複雑多様な(巨視)塑性挙動をシミュレートし,本モデルの実際的意義を確認した.
石英ガラス, 5Na2O・95GeO2ガラス, Ca(PO3)2ガラス, ソーダ石灰ガラス及びパイレックスガラスの光弾性定数 (以下Bと略す) を測定した. 石英ガラスのBがソーダ石灰ガラスのBの1.33倍であることはWeyl説では説明できない. 石英ガラスでは主としてSiO44面体の6員環からなり, 環内には透き間がある. この構造への, 圧縮において共有する角頂の結合角が変化する変形によって透き間を埋める変形が起こり, これが8を正で大きくしているとして, Bへの寄与に対する新しい機構を提案した. GeO2, 5Na2O・95GeO2ガラスも同様である. ホウ酸塩ガラス, ホウケイ酸ガラスではtetraborate群及びdib…
The impulsive pressure pulses arising from copper wire explosions are measured using Hopkinson pressure bar technique under various charging voltages up to 63 kV, charging energies up to 2.6 kJ, natural frequencies of the discharge circuit from 10 kHz to 50 kHz and various wire dimensions, and impulses which are defin…
The influence of temperature and chloride content on the behavior of localized corrosion such as crevice corrosion and on the occurrence of stress corrosion cracking have been investigated by long term immersion of the spot-welded specimens of ferritic and austenitic stainless steels in 100-21, 000ppm Cl- solutions at…
Adsorption behaviors of Ni (II), CO (II) and Mn (II) on silk fibroin fiber and also on the same fibers but chemically modified with acetic anhydride-pyfidine mixture or dehydrated methanol were investigated, and the results were compared. The following findings are reported: (i) No adsorption of Ni (II), Co (II) and M…
Thin films of ZnS prepared by coevaporation of ZnS and MnF 2 have been studied by XPS. It is found that the binding energies of Mn 3p and F 1s electrons, as well as the intensity ratio of the Mn 3p peak to the F 1s peak, depend on the concentration of Mn, and can be divided into three groups. A tentative model that pe…
The kinetics of aqueous polymerization of acrylamide with the Cu2+/metabisulfite redox system has been studied in an atmosphere of nitrogen at 35 ± 0.2°C. The rate of polymerization has been found to be second power on monomer concentration, zero and 0.5 power with respect to catalyst, and 0.5 power with respect to ac…
The kinetics of anodic iron dissolution in deaerated and oxygenated distilled water has been studied using a galvanostatic method. In oxygenated water an indirect method was also used. This indirect method is based on determination of the anodic partial potential-current curve from the dependence of the open circuit p…
A model coupling continuous diffusion theory with atomistic considerations near a void surface has been developed for studying the intrinsic growth kinetics of a void with a surface energy barrier against the migration of defects. Such barriers might exist, for example, due to short-range stress fields or to solute se…
Abstract The physical solubility of chlorine in acetic acid is sufficiently large (=1.00 mol dm −3 at 333 K) to enable the kinetics of reaction between chlorine and acetic acid to be determined in the homogeneous phase. The product of reaction, monochloroacetic acid, is industrially important. The solubility of chlori…
The course of the phase transformations upon cooling of a multicomponent Cu–10Al–3Fe–2Mn aluminium bronze has been followed by means of thermal analysis, dilatometry, X-ray diffraction, X-ray microanalysis, optical metallography as well as by electrical resistivity and hardness measurements. The continuous cooling tra…
Takashi TAGAWA, Kaoru SHIMAMURA; Observation of the Internal Lamellar Structure in Polyethylene Films by Nitric Acid Treatment and SEM Technique, Journal o
Abstract It was found that carbon disulfide copolymerizes with N ‐(β‐cyanoethyl) ethylenimine by using water as a catalyst. The copolymerization was conducted in detail by using water as a catalyst in the temperature range between 0 and 50°C with various initial concentrations of carbon disulfide and N ‐(β‐cyanoethyl)…
In this paper the author deals with the diatom from the Yodo estuary of Osaka, Japan. The samples were taken from the surface of the stone at four stations near the river mouth of the River Yodo on October 12, 1977. In all 49 taxa of diatoms were identified, of which 37 were alive and 12 were observed only in cleaned…
Abstract For the prediction of possible failures due to SCC as well as for corrosion prevention by anodic or cathodic protection, the evaluation of critical potential ranges for susceptibility to SCC is of great practical importance. For this purpose, accelerated testing techniques have been described in the literatur…
The pressure-composition-temperature relations for niobium selenides NbSex were determined by annealing the sample under controlled selenium vapor pressure in the composition range x=1.48−2.00. There exist five phases; Nb2Se3, 2H(a), 3R, 2H(β) and 4H . The 2H(a) and 3R phase are known stable over a wide range of nonst…
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Abstract Anläßlich der Gewinnung von Hederagenin (1) sind die Perikarpien von Sapindus mukorossi Gaertn . auf unbekannte Inhaltsstoffe untersucht worden. Es sind Stigmasterin, Stigmasteryl‐β‐D‐glucopyranosid, β‐Amyrin (2) , 28‐Norolean‐12‐en‐3β, 17β‐diol (3) und 3,23‐Ethylidenhederagenin (4) gefunden worden, wobei 4 m…