Materials Literature
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The structure, Curie temperature and magnetostriction of PrxDy1−xFe2 (0⩽x⩽0.5) and Pr0.4Dy0.6(Fe1−yMy)2 (0⩽y⩽0.6) alloys (M=Co, Ni) have been investigated using optical microscopy, x-ray diffraction, ac initial susceptibility and standard strain gauge techniques. The matrix of homogenized PrxDy1−xFe2 alloys is a cubic…
The erosion of polymers and polymer-based materials (such as composites and paints) due to atomic oxygen (AO) present in the low Earth orbit (LEO) environment is described. Since many polymers are used extensively to fabricate spacecraft structures and components, a method of protecting them from AO erosion was develo…
The compatibility of d 8 -poly(methyl methacrylate) ( d 8 -PMMA) and a series of poly( n -alkyl methacrylate)s (PnAlkMA) is studied by systematic variation of the length of the n -alkyl group from ethyl (EMA) to n -pentyl (nPenMA). Simultaneously, a series of symmetric diblock copolymers comprised of d 8 -PMMA and of…
A noteworthy inhomogeneous distribution of Ni in low-alkali borate glasses has been shown by Ni K-edge EXAFS (Extended X-ray Absorption Fine Structure). The first evidence of a multiple scattering feature in a glassy matrix indicates an extended intermediate range order extending up to 6 A. The Ni-enriched domains con…
This study has (a) examined the profile of recycled postconsumer fibers, (b) evaluated product characteristics that are suitable for recycled postconsumer fiber application, and (c) explored the market potential for recycled postconsumer fiber products. Average fiber content (by weight) of used clothing in this study…
Electronic absorption spectroscopy was used to measure the molecular association of copper phthalocyanine tetrasulfonate in micellar solutions, a microemulsion made with cationic surfactant, and homogeneous solvents. Analysis of absorbance versus concentration data using a multiple-aggregation model and non-linear reg…
Sewing is one of the most commonly used manufacturing processes in the world. Millions of parts are sewn every day ranging from cloths, shoes, furniture, to automobile seat covers. However, it is also one of the least understood processes. In fact, according to literature survey, few know how to calculate the sewing f…
Composite materials were fabricated using jute and polypropylene sacks by compression molding. Different types of composites were fabricated by varying the number of jute layers, number of polypropylene layers and the mode of combination of jute and polypropylene layers keeping the total number of layers a constant. I…
Several room temperature bis-tolane liquid crystals were synthesized and their physical properties evaluated at elevated temperatures. These highly conjugated liquid crystals exhibit not only high birefringence (Δ n >0.4) but also low melting temperature. Their applications for flat panel displays employing light s…
In this paper, we discuss the shielding effects of lossy dielectric materials located in front of a human model. Using the method of moments, we investigated the shielding effects by calculating the "whole average specific absorption rate (SAR)" and the "local SAR" for a three-layered elliptical model of the human bod…
Abstract Common acid corrosion inhibitors frequently require the addition of intensifiers or contact time extenders when used in very strong acids, high temperatures, or for long contact times. Effective metal intensifiers have the severe disadvantage of being exceedingly toxic to aquatic life as well as humans. Coppe…
The commercialization of field emission displays (FEDs) has been delayed despite optimistic promises in the mid 1990’s. Apparently, more time is needed to identify optimum solutions to the complex problems associated with fabrication, assembly, and operation of the displays. One of the reasons for this delay is that a…
Corrosion and passivation behaviors of three brass alloys, including selective leaching of the alloys in acidic, neutral, and basic solutions, were investigated in aqueous solutions of different pH. Open-circuit potential measurements, polarization data, and electrochemical impedance spectroscopy (EIS) were used to ob…
Minimal cluster expansion models of B-site cation ordering in ${A(B}_{1/3}^{\ensuremath{'}}{,B}_{2/3}^{\ensuremath{''}}){\mathrm{O}}_{3}$ perovskites are evaluated. It is demonstrated that the linear triplet interaction is both necessary and sufficient to stabilize the $P\overline{3}m1 1:2$ structure ground state that…
The kinetics of thermal and oxidative decomposition of printed circuit boards is investigated under various heating rates (5, 10, 15, 20, and 25 K/min) and oxygen concentrations (5, 10, and 15%) in the nitrogen-oxygen atmosphere by means of thermogravimetric measurements. Results show that there is only one reaction s…
Poly(vinyl chloride) (PVC) thermal degradation is the result of a ‘zipper dehydrochlorination’ process that involves allylic chlorides as intermediates and is catalysed by hydrochloric acid. The degradation process can be stopped by PVC stabilisers, which either react with allylic chlorine atoms (primary stabilisers)…
It is worth noting that, with a few exceptions, the efforts to develop dielectric systems, especially for the LTD superconducting cables, are lagging behind the intense efforts to develop more efficient HT superconducting materials, tapes, and conductors. The results presented here and reported in the literature confi…
To understand the dehydration mechanisms of aluminum hydrates, the dehydration sequence of gibbsite (γ‐Al(OH) 3 ) by electron‐beam irradiation has been investigated using transmission electron microscope (TEM). The electron diffraction pattern indicates the formation of chi‐alumina in the initial dehydration stage. Th…
Porous polyimide films were prepared in two steps. The first step was the preparation of poly(urethane-imide) films by a reaction between a phenol-terminated polyurethane prepolymer and poly(amide acid) obtained from pyromellitic dianhydride (PMDA) and oxydianiline (ODA) followed by thermal treatment at 200 °C. The se…
Communication: Silicon carbide is an important non-oxide ceramic; however, production methods have until now remained difficult and/or expensive. In this communication is reported the production of silicon carbide via thermal decomposition from the novel Si-carbodiimide polymer poly-(methylsilasesquicarbodiimide), PSM…