Materials Literature
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In 1987, a serious radiological accident occurred in Goiania, Brazil. Four inhabitants died and about 250 persons were internally or externally contaminted with 137Cs released from a removed and then broken source vessel. In this report, outline of the accident and, activities on surveillance of contamination and work…
(1989). Application of one-sided welding to field girth joint of large scale penstock. Welding International: Vol. 3, No. 12, pp. 1046-1050.
The interaction between water and cellulose has been studied by deuterium NMR and water sorption isotherm measurements for a bleached kraft pulp and an unbleached liner board pulp beaten to various degrees. Measurements of 2H quadrupole splittings, spin lattice relaxation rates and half height line width shave been ca…
目的 : 被服の保温性能を決める上で, 被服材料と空気層との相互作用は重要な要素であるので, 多様な被服材料について, 空気中に水平に設置した熱板から被服材料および介在する空気層を通して大気への熱損失を測定し, 自然対流による熱輸送が支配的な極低風速のもとでの, 布および空気層からなる系の伝熱特性を調べた.成果 : 多様な材料のうち, とくに, サージ, モスリン, フラノ, レザーの典型的な4種類の材料については, 測定結果を布/大気, 空気層/布/大気の伝熱モデルと比較することによって, 各構成要素の熱輸送への寄与を分離し, 空気層, 布, 大気, 各々の熱通過率, および, 布のみで被覆した場合の布と熱板との接触抵抗にっいて…
Oxidation behavior of mullite composites containing 10 to 30vol% of SiC-whisker (SiC-w) has been studied at 1300°C in dry air. As the volume fraction of SiC-w increased, the weight gain increased. The weight gain curve obeyed the parabolic law for the SiC-w content of 10vol% and at the oxidation time shorter than 200h…
日本建築学会は, 鉄筋コンクリート造建物を対象とした終局強度型の耐震設計指針 (案) を昨年10月に公表した。本稿では, この指針 (案) について, 特徴的な考え方, 本文および解説に示された内容, 現行設計法との相違点, 背景となった研究の概略を紹介するとともに, 問題点, 将来の課題等について述べる。
Lattice parameter measurements were made at high temperatures of up to 700°C on synthetic titanomagnetite samples with x values of 0.0, 0.3, 0.7, and 1.0. A high temperature X-ray camera was used for the measurement, where heating was made in vacuum. The variation of the lattice constants of the titanomagnetite series…
To exploit the full potential of parallelism of light in optical processing systems it is of paramount importance to have optical components which can efficiently generate arrays of >100 × 100 beams and/or images. In this paper we report on fabrication of very large binary phase grating beam splitters, better known…
El Programa Latinoamericano de Lucha contra la Corrosión (P.L.C.) se encuentra insertado dentro de los proyectos apoyados por la Organización de los Estados Americanos (OEA), participando además Brasil, Chile y México. Tiene por objetivo fundamental la transferencia de información al usuario con el fin de combatir la…
A trial has been conducted to apply Oxidation-Reduction Potential (ORP) to the on-line monitoring of Fe2+ and Fe3+ in a chloride bath for iron plating having iron concentration of 160230 g/l and Fe3+/Fe2+ concentration ratio of 0.01 0.12.From the analysis of ORP's at different bath pH (0.51.4), temperature (2095°) and…
Effects of water, chloride ion and formic acid on galvanic corrosion of mild steel coupled to noble metal in methanol have been investigated by the amount of galvanic current with zero impedance ammeter and by weight loss measurement. The corrosion rate of mild steel in methanol containing chloride ion and water was f…
18-8 stainless steel ingots which are added with surface active elements, Bi, Sn, Te are cast with the water cooled copper mold at the pouring speed of 10 mm/s. Transverse and longitudinal microstructures in the vicinity of the surface of ingots are observed. The solidification microstructures become fine and the effe…
Al2O3 composites reinforced with (0-40)mass% SiC whisker were prepared at a temperature range 1673 K-2123 K for 3.6 ks under 40 MPa by hot-pressing and the effects of pretreatment process of SiC whisker and SiC whisker content on the mechanical properties of the composites were mainly investigated. The toughening mech…
Abstract IR spectroscopy is utilized to analyse the mixed crystal system of AgNO 3 and Sr(NO 3 ) 2 in the ordered phase II and disordered phases of silver nitrate. The study aims mainly to clearify the change and the affect of partial replacement of Ag + ion by Sr ++ ion in the mixed crystal system of the two metal ni…
L'oxydation du carbure d'aluminium pulvérulent dans l'oxygène est gouvernée par un mécanisme complexe. Aux basses températures, et au début de la réaction à toute température comprise entre 880°C et 1250°C, il s'agit d'un mécanisme en parallèle de diffusion et de réaction, le second étant beaucoup plus rapide que le p…
The corrosion resistance and weld hot cracking of high silicon containing stainless steels were investigated from a metallurgical point of view. A stainless steel has good corrosion resistance due to the passive film. However the stainless steels differ from the intergranular corrosion in the high potential region, fo…
A simple flow-system was designed to study the dissolution of cobaltous oxide (CoO) at surface conditions (25° and 39°C, one atmosphere). Experiments were carried out using solutions with salinities less than 0.01m and pH's of 0.7-3.46. The dissolution was found to be controlled by surface reactions and has a reaction…
The electrical resistivity and magnetization of Ni-base alloys containing Zn up to 25 at% were respectively measured between 4.2 and 1000 K and at 77 K. With increasing Zn content, the magnetic contribution to the resistivity slightly increases and has a broad maximum at 8–16 at% Zn, notwithstanding the linear decreas…
This paper presents a study on the effect of intergranular oxidation on the bending fatigue strength of case-hardened gears. The test gears were case-hardened by gas-carburizing and vacuum-carburizing methods, and the degree of intergranular oxidation and the grain size of these gears were examined. Bending fatigue te…
The authors previously reported that polyunsaturated fatty acids having 1, 4-diene structure can be easily conjugated at ordinary temperature using iodine as a photosensitizes.This paper describes the optimum conditions for the iodine-sensitized conjugation of methyl linoleate under irradiation with a 100W high-pressu…