Materials Literature
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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…
<div class="htmlview paragraph">Three-way catalytic converters used on spark ignition engines have performance and durability characteristics which are effected by the thermal environment in which these operate. The design of the exhaust system and the location of the catalyst unit are important in controlling t…
The elastic field induced by a straight dislocation in a one-dimensional hexagonal quasicrystal with its line parallel to the quasiperiodic axis is obtained by superposition of the elastic fields of a pure edge part and a pure screw part. By extending the Peach-Koehler force to quasicrystals, the force between two par…
Past research on all-dielectric nonpolarizing beam splitters is reviewed. It is shown that, for a 50-nm spectral region, it is possible to design and manufacture a two-material nonpolarizing plate beam splitter for use at an angle of 45 degrees (with a measured rms reflectance of 0.50 +/- 0.01 for both s- and p-polari…
The crystal structure of the 224-residue protein dethiobiotin synthetase from Escherichia coli has been refined using X-ray diffraction data at 0.97 A resolution at 100 K. The model, consisting of 4143 protein atoms including 1859 H atoms and 436 solvent sites, was refined to a final R factor of 11.6% for all reflecti…
<div class="htmlview paragraph">In laboratory engine tests, a combination of platinum and cerium fuel additives with a platinum activated wall flow monolithic filter has been shown to be especially effective in the control of diesel particulate. Continuous regeneration of a filter can be achieved at temperatures…
The electrical properties of yttria (8 mol %)‐stabilized zirconia (YSZ)‐nickel oxide (NiO) composites were examined between 400 and 1000°C. The temperature and oxygen partial‐pressure dependence of conductivity and the electromotive force measurement of the galvanic cells helped to determine the electronic contributio…
Macroscopic properties of ferroelectric samples, including those in form of thin films, are, to large extent, influenced by their domain structure. In this paper the free energy is calculated for a plate-like sample composed of nonferroelectric surface layers and ferroelectric central part with antiparallel domains. T…
Homogeneous surface alignment of liquid crystals (5CB) is observed for films formed by coating with aqueous solutions of hydroxypropylcellulose (HPC) for high coating speeds and thin coating thicknesses. On the other hand, for films formed with isotropic ethanol solutions of HPC, 5CB molecules retain the flow-induced…
Abstract The influence of phase morphology and carbon black distribution on energy storage and dissipation during dynamic excitations of rubber blends is discussed. It is shown that differences in the local stiffness of the phases in the glass transition regime of unfilled blends lead to characteristic deviations of t…