Preparation of barium titanate–polypyrrole compositions and their electrical properties
Their Electrical
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Immobilization of poly(ethylene oxide) on poly(ethylene terephthalate) using a plasma polymerization process
Abstract Poly(ethylene oxide) (PEO) has been covalently immobilized on poly(ethylene terephthalate) (PET) films using a radio frequency glow discharge polymer deposition process, followed by chemical coupling. Amino or hydroxyl groups were introduced onto the surface of the PET by exposing the films to allylamine and…
Shear breakage of nylon membrane microcapsules in a turbine reactor
The breakage of nylon membrane microcapsules is proposed as a new method to study and quantify shear effects in biological systems. A critique of this method shows that a narrower particle size distribution may be an important improvement in the breakage study as well as breakage control in many bioreactor and biotech…
Thermal degradation of cellulose‐containing composites during processing
Abstract The strength properties of composites made of untreated cellulose fibers and linear low density polyethylene were investigated as a function of processing parameters. Studies have shown that the strength properties of composites increase with processing time and temperature. The increase in strength is accomp…
Elastic Anomaly and Phase Transition of BaTiO3
The acoustic-phonon velocities of a single crystal of BaTi${\mathrm{O}}_{3}$ have been measured as a function of pressure up to 8 GPa, including the transition pressure ${p}_{c}=2.35$ GPa, by means of Brillouin scattering technique. Only one elastic eigenmode shows an anomalous decrease on approaching ${p}_{c}$ and th…
Line Narrowing in Photoemission by Coincidence Spectroscopy
We present photoemission spectra from the $3p$ level of Cu(100) obtained in coincidence with the ${M}_{3}\mathrm{VV}$ Auger line. The $3p$ level is narrowed from its 2.2-eV core-lifetime-broadened width to 1.0 eV, representing the intrinsic width of the $^{1}G$ Auger final state. The core line changes its energy withi…
Instability in a Sand Heap
When a bead heap is submitted to low-frequency ($\frac{\ensuremath{\omega}}{2\ensuremath{\pi}}=10\ensuremath{-}1000$ Hz) vertical vibrations at a large enough amplitude $a$, its horizontal free surface becomes unstable and a stationary state is reached. This one is characterized firstly by a free surface which is incl…
A Comparison between Industrial and Laboratory Beating with Regard to Fibre Development
The effect of industrial beating on tensile strength properties has been compared with laboratory beating and the differences observed have been explained in terms of fibre properties. Tensile strength development is less pronounced for industrial beating than for laboratory PFI-mill beating. Beating in the laboratory…
Nonlinear optical studies of semiorganic crystals
We invoke the term semiorganic to describe a new class of nonlinear optical compounds composed of part organic and part inorganic constituents. The recently reported crystal 1-arginine phosphate (LAP) is one such material where organic 1-arginine molecules form cations and crystallize with inorganic phosphate anions.…
Radiological accident of cesium-137 in Brazil. Activities of surveillance and decontamination.
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…
Application of one-sided welding to field girth joint of large scale penstock
(1989). Application of one-sided welding to field girth joint of large scale penstock. Welding International: Vol. 3, No. 12, pp. 1046-1050.
Deuterium NMR and Water Adsorption Studies of the Effect of Beating on the Water-cellulose Interaction
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…
Effect of an air layer on thermal insulation of clothing materials.
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 of SiC-Whisker/Mullite Composites in Dry Air
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…
An Outline of “Design Guidelines for Earthquake Resistant Reinforced Concrete Buildings Based on Ultimate Strength Concept”
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 constants of titanomagnetites at high temperatures.
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…
Binary phase grating beam splitters for a very large array generation
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…
Propiedades y control de calidad de pinturas y recubrimientos
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…
Determination of Fe<SUP>2+</SUP> and Fe<SUP>3+</SUP> Ratio in Iron Plating Bath by Measurement of Oxidation-Reduction Potential
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…
Galvanic Corrosion of Mild Steel and Application of Corrosion Monitor in Methanol
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…