Materials Literature
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CeO 2 −ZrO 2 mixed oxides were synthesized by two mild chemical routes: complexation with citric acid and the sol−gel method. XRD and ESEM investigations revealed the appearance of a solid solution around 400 °C, depending on the ratio between the two oxides and the preparation method. Solids obtained by the citrate m…
We report here the solution-phase synthesis of highly uniform and monodisperse cubic Cu 2 O nano- and microcubes. Copper(II) salts in water are reduced with sodium ascorbate in air, in the presence of a surfactant. The average edge length of the cubes varies from 200 to 450 nm, as a function of surfactant concentratio…
We report the first successful integration of magnetostrictive Metglas (Fe/sub 78/Si/sub 9/B/sub 13/) thin film sensor with a readout circuit using standard integrated circuit (IC) process and surface micromachining. The Metglas thin film is on a nitride cantilever beam. Its magnetic domains are subject to rotation in…
The phonon contribution to the thermopower, S/sub p/, was first seen in germanium at low temperatures, and theoretically explained by Herring. Subsequently it was also predicted and identified in metals and alloys. In melts all phonons interact with the electron gas, and the theory is much simpler. In semiconductors o…
Direct measurement of space charge and conduction current was carried out on low-density polyethylene degraded by ultraviolet radiation using a pulsed electro-acoustic (PEA) method. Dominant heterocharges were formed near both electrodes by high voltage application and was found to be deeply trapped. In this paper, th…
Partial discharge measurement has been a good tool for the quality assurance of power cable insulation under alternating voltage. With the growing interest in HVDC power cables, it therefore seems logical to extend this technique for use at direct voltage. The paper describes this technique as used on a HVDC cable wit…
Abstract Raman measurements of heavily doped laser crystallized poly‐Si and as‐deposited μc‐SH show significant differences between the two materials. Poly‐Si samples exhibit the Fano effect just like heavily doped c‐Si samples. This is not true for the heavily doped μc‐SH samples.
Charging of resist films during electron beam exposure has been believed to cause significant (up to 500 nm) pattern displacement. However, our own modeling and direct measurements of pattern displacement have suggested that the pattern displacement is less than 20 nm under typical mask making conditions (10 keV elect…
Abstract The mechanical properties of polyester (PET) yarns, fine filament, and microdenier (original and heat‐set), treated with a trichloroacetic acid–chloroform (TCAC) mixture were investigated. The treatments were carried out in an unstrained state with various concentrations of the TCAC reagent at room temperatur…
Abstract In 18 fluoropolymers with different repeating‐unit structures and crystallinities, the solubility, diffusivity, and permeability at 70°C of a polarizable nonpolar solute (tetrachloroethylene) were studied. The transport properties were mostly controlled by the polarity of the polymer and to a lesser degree by…
This presentation assists the power electronic designer in selecting the correct plastic film capacitor for a particular application. It reviews the critical characteristics of the capacitors utilized in most power electronic applications. It presents why polypropylene is the dielectric of choice and which winding con…
This paper is an introduction and theoretical investigation of the fast-transient cooling characteristics of a TE module under applied high-current electrical pulses. A temperature-dependent, finite element model was developed to accurately model the fast-transient performance. Analysis of experimental data is present…
The high-temperature sensitivity of shape memory alloys (SMA) provides them with the ability to vary the load-deflection curve with temperature when used as Belleville washers. This paper describes the properties and behavior of a SMA Belleville washer made of CuAlNiMnTi under different testing conditions. In addition…
The arsenic triiodide–sulfur adduct, AsI3·3S8 is a new nonlinear optical acceptor–donor intermolecular complex of relatively high second-order susceptibility, ?(2)ca. 10–11 m V–1. Single crystals formed by addition of AsI3, and octasulfur, S8, in the molar ratio 1 : 3 were grown from solution. The space group is R 3 m…
We investigated the optical properties of epitaxial orthorhomic cuprous oxide films grown on MgO [110]. Absorption measurements show clear excitonic peaks up to $n=5p.$ Photoluminescence at 2 K shows several sharp emission peaks in the vicinity of 610 nm associated with a splitting of various $1s$ orthoexciton energy…
Vehicular application of hydrogen requires a lightweight, compact, safe and economic containment method. Although various hydrogen storage technologies are presently available, none completely satisfies all of the requirements. Fuel cells use oxygen and hydrogen as the fuel and produce water as the only product of com…
After more than 18 months on float, production AGM cells continued to emit gas (i.e. lose water) at rates too high to permit a 20 year life. The rates did not appear to be declining with time. Gel cells on the same test, but at a lower float voltage, had lower gas emission rates. Catalysts placed in the gas space of A…
A conventional type thermoelectric module based on Si/sub 2/Ge has been made for power use. The module consists of 10 pairs of p- and n-type Si/sub 2/Ge elements in which B and P were doped (/spl sim/10/sup 20/ cm/sup -3/) respectively. The elements electrically connected in series using Mo electrodes are sandwiched b…
The effects of steric hindrance on the complexation of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) by chelators based on cis,cis-1,3,5-triaminocyclohexane (tach) have been studied. The chelators studied are the 2-methylpyridyl pendant-arm derivatives of tach, ‘tachpyr’ (N,N′,N″-tris(2-pyridylmethyl)-cis,cis-1,3,5-triami…
The space charge that accumulates in DC cables can, mathematically, be resolved into two components. One is related to the temperature and the other to the magnitude of the electric field strength. Analytical expressions for the electric fields arising from each of these space charge components are derived. Thereafter…