Materials Literature
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Sr 2− x Ca x NaNb 5 O 15 (SCNN, x = 0.1) piezoelectric ceramics with tetragonal tungsten bonze structure were successfully produced by spark plasma sintering. Part I of this study presented the sintering of these highly dense ceramics. The current work investigates their electrical (dielectric, ferroelectric, and piez…
We report on the optical spectroscopy of the silica sol–gel glass doped with chromium of various valences where Cr 6+ and Cr 5+ ions appear to be most active. The presence of the Cr 5+ ions in six-fold coordination is seen in the luminescence spectra and decays whereas the Cr 6+ ions in four-fold coordination are most…
Abstract Rheological properties, morphology, and oil resistance in natural rubber (NR)/nitrile rubber (NBR) blends were investigated as functions of blending conditions and viscosity ratios of the blends. As for the blending condition effects, Mooney viscosity of the blends depended more strongly on blending time than…
We report on the photoresponse behavior of n-ZnO/p-Si photodiodes. Semiconducting n-ZnO films have been deposited on p-Si substrates at 480 °C using various Ar/O2 ratios, 2:1, 4:1, and 6:1, to fabricate n-ZnO/p-Si photodiodes. As a laser of 670 nm wavelength illuminated the photodiodes, a maximum responsivity of 0.286…
ABSTRACT: The effects of plasticizers on the mechanical properties and glass transitions of a meat‐starch extruded system were studied. Mixtures of meat and potato granules (1.48:1) and up to 4% glycerol and propylene glycol, respectively, were extruded and equilibrated at different relative humidities. Storage moduli…
Abstract This article presents a brief review concerning the production of conductive polymer blends and composites which combine conducting and insulating polymers. Different strategies for preparing these mixtures are examined, with emphasis on several properties of the final mixtures, such as: electronic conductivi…
In this second of a series of three papers, the authors investigate partial discharge (PD) detection and propagation in cable joints. The complex nature of cable joints leads to errors when PD analysis is carried out using conventional equivalent circuits. The authors use the finite difference time domain method to de…
Modifications to a scanning electron microscope (SEM) and a commercially available heating stage permits in situ imaging at temperatures as high as 1450 degrees C. Here we report on the technical modifications necessary to allow such high-temperature in situ imaging. In addition, in order to underline the potential of…
We consider heat transport in a Luttinger liquid (LL) with weak disorder and study the Lorenz number for this system. We start at a high- T regime, and calculate both the electrical and thermal conductivities using a memory function approach. The resulting Lorenz number L is independent of T but depends explicitly on…
The isotopic composition of boron in illite-smectite (I-S) can be important for monitoring fluid/rock interactions in sedimentary basins. Boron substitutes for Si during reaction of smectite to illite and can preserve information about paleofluid B-isotopic composition. Boron is enriched in oilfield brines, therefore…
Measurement in the frequency range 3 mHz–10 6 Hz of the dielectric characteristics of emeraldine base polyaniline dissolved in 1-methyl-2-pyrrolidinone (NMP) and cast into bulk free-standing polymer films shows features similar to those reported by others and which are a result of microphase separation into reduced an…
Van Wyk's equations are used to approximate static low-load compression curves (maxi mum 10 gf/cm 2 ) of both woven and knitted materials generally used in garment automation. The simple two-parameter approach, which excludes the volume in unloaded conditions, is first used as an estimate and gives the starting values…
There are two anomalies at the tin bath side of silicate float glasses caused by the in-diffusion of tin into the glass melt, the tin hump in the micrometer region and the phenomenon of bloom, a microscopic wrinkling at the glass surface after reheating in air. A diffusion–reaction model is developed to explain the ti…
A polarization grating (PG) written in an azo-dye-doped film of polymer-ball-type polymer-dispersed liquid crystals was investigated. The writing beams were two mutually orthogonal (s- and p-polarized) polarized beams. The PG resulted from molecular reorientation of the liquid crystals as a result of their interaction…
One of the major concerns in the oil and gas industry is corrosion. Microbial-influenced corrosion (MIC) can be defined as the deterioration of metals by natural processes directly or indirectly related to the activity of microorganisms. MIC affects many industries, such as petrochemical, ships and marine structures,…
The lamellar structures of anionic poly(amido amine) dendrimers possessing carboxylate terminal groups at half-generations G = n .5 (G2.5 and G4.5) with the cationic surfactant didodecyldimethylammonium bromide (DDAB) were investigated by small-angle X-ray scattering (SAXS) at 25 °C. The incorporation of dendrimers in…
The lattice thermal conductivity of cubic silicon carbide is evaluated by means of a microscopic model considering the discrete nature of the lattice and its Brillouin zone for phonon dispersions and scattering mechanisms. The phonon Boltzmann equation is solved iteratively, with the three-phonon normal and umklapp co…
Arsenic selenide glass optical fibers typically possess extrinsic absorption bands in the infrared wavelength region associated with residual hydrogen and oxygen related impurities, despite using purified precursors. We report a purification process based on the addition of 0.1 wt% tellurium tetrachloride (TeCl 4 ) to…
A new method of modeling three-phase transformers has been developed. The method can represent transformers with two or more windings and can incorporate the effects of interphase coupling, particularly the lowered impedance of three-phase units to zero-sequence magnetizing currents. For two-winding transformers, the…
Single crystals, with high Curie temperature ( T c ), of the x Pb(In 1/2 Nb 1/2 )O 3 – y Pb(Mg 1/3 Nb 2/3 )– z PbTiO 3 (PIMNT100 x /100 y /100 z ) ternary system near a morphotropic phase boundary were successfully grown by a conventional flux method using PbO–B 2 O 3 flux. The crystals were grown in a platinum crucib…