Materials Literature
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As the 2010 phaseout date for chlorofluorocarbons draws nearer, materials engineers are working to find replacements for these ozone-depleting chemicals in the production of plastics and other products. One team of engineers is focusing on a combination of two low-cost and environmentally benign substances--supercriti…
In this paper we demonstrate for the first time that pre-vulcanized NR latex can be doped by iodine to become electrically conducting. The study reveals that pre-vulcanisation will not hinder the formation of conjugated sequences, which is widely accepted as a prerequisite for developing intrinsic electrical conductiv…
Extended abstract of a paper presented at the Pre-Meeting Congress: Materials Research in an Aberration-Free Environment, at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, July 31 and August 1, 2004.
O presente trabalho foi desenvolvido com o objetivo de avaliar o efeito da adição de CO2 sobre a qualidade do macarrão tipo massa fresca. Esse produto, por apresentar características desejadas pelo consumidor, como preparo rápido e sabor agradável, vem proporcionando uma aceitação cada vez maior. Além disso, o consumi…
Void swelling of PWR austenitic internals has recently been identified as a materials issue that might impact license extension. Earlier published studies have shown that the atomic displacement rate is unexpectedly one of the most important variables that determine the magnitude of swelling. In addition to difference…
Nuclear waste management has led to recycling PuO/sub 2/ into mixed oxide fuel nuclear fuel (MOX). Its manufacturing route involves a sintering process. A multiscale model is under construction in order to predict the evolution of the sample characteristics during sintering and to improve sintering conditions. The pur…
La 1− x Li x FeO 3 solid solution prepared by solid-phase synthesis in an air environment at atmospheric pressure is found to exist only for x ≲0.1. All single-phase samples are p -type semiconductors. An increase in lithium concentration brings about a decrease in their electrical resistivity and thermopower. The res…
The physical properties of six ICCS fibers—B—26, C-36, D-5, E-4, G-17, and I-26-their percent crystallinity, and the amount of absorbed water are measured in order to establish relationships with specific surface areas measured by the absorption of methy lene blue in a liquid phase. The results show the relationships…
Polarization hysteresis loop of CaBi4Ti4O14 thin film has been studied in the frequency range from 200 Hz to 600 KHz for different applied voltages. It shows that the hysteresis loop is frequency- and voltage-dependent. The maximum polarization decreases logarithmically with the increase of frequency. In contrast, the…
Two kinds of glass/ceramic composites were prepared. The first contained borosilicate glass with SiC ceramic: batches designated SG10, SG20, SG30 and SG40 consisted of 10 : 90, 20 : 80, 30 : 70 and 40 : 60 SiC/glass (wt-%) respectively. The second contained borosilicate glass with ZrO2: batches designated ZG5, ZG10, Z…
This paper describes the optimization of a post-type spacer in a gas insulated system. The electric field calculation and the optimization have been performed in three-dimensional conditions. We have utilized the boundary element method to calculate the electric field distributions and the Marquardt method to improve…
A comparative study of the effect of gamma and laser irradiation on the thermal, optical and structural properties of the CR-39 diglycol carbonate solid state nuclear track detector has been carried out. Samples from CR-39 polymer were classified into two main groups: the first group was irradiated by gamma rays with…
The Fourier Transform-Raman and Fourier Transform-Infrared spectra of 5-bromo-2-nitropyridine have been recorded. The observed frequencies were assigned to various modes of vibrations on the basis of normal coordinate calculations, assuming C S point group symmetry. The potential energy distribution associated with no…
Fatigue crack propagation (FCP) rates for 304 stainless steel (304 SS) were determined in 24°C and 288°C air and 288°C water with 20–60 cc H2/kg H2O using double-edged notch (DEN) specimens. Tests performed at matched loading conditions in air and water provided a direct comparison of the relative crack growth rates o…
The magnetic behaviour of nanocrystalline nickel–zinc, zinc–manganese and nickel–manganese ferrites processed by reverse micelle technique was studied by Superconducting Quantum Interference Device. The surface roughness of the nanoparticles as measured by atomic force microscopy was less than 3 nm and the size of the…
In earlier days it was believed that the presence of microbes at a slightly higher density (i.e 10^4 CFU) showed that the environment was corrosive. In the year 1995 researchers identified that there are certain groups of microorganisms which can offer protection to the materials. The majority of the research work con…
The mathematical modeling of a bolted joint with a Shape Memory Alloy (SMA) actuator ring is presented. In this way, phase transformation, constitutive and displacement compatibility equations are used. The obtained model is utilized to show how the application of the SMA actuator ring in the bolted joint can help the…
Abstract The study of polymer morphology continues to be the principal means of acquiring knowledge and understanding of macromolecular self‐organization. Longstanding problems of the nature of melt‐crystallized lamellae and spherulitic growth have been resolved, bringing understanding of how characteristic properties…
During conflict, Royal Navy personnel wear a two‐ply flame‐retardant (FR) “action coverall” (AC) and “anti‐flash” (AF) hood and gloves, made from Proban (Albright & Wilson's registered trademark) treated cotton. It is a widely held belief that extended wear, and repeated washing damages the Proban ® FR finish maki…
We have proposed a technique for fabricating carbon nanotube single-electron transistors using a focused ion beam (FIB). Wiring to a multiwalled carbon nanotube was formed by the ion-beam-assisted deposition of tungsten. Tunneling barriers were formed in the nanotube by ion beam etching. A drain current oscillation or…