Materials Literature
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Water treeing is one of the factors leading to failure of medium voltage XLPE cables in long-term service. Increased moisture content inside oil-paper insulated cable is not desirable. To identify water tree degraded XLPE cables or oil-paper cables with high moisture content, diagnostic tests based on dielectric respo…
PURPOSE: To compare in the entire liver, the hepatic kinetics of gadobenate dimeglumine (Gd-BOPTA) and gadopentetate dimeglumine (Gd-DTPA) and to evaluate the hepatic transport of Gd-BOPTA. MATERIALS AND METHODS: The authors studied both contrast agents in isolated perfused rat livers by measuring the magnetic resonan…
Single crystals in the BiScO 3 -PbTiO 3 (BSPT) system were grown using the conventional high temperature solution method. The dielectric, piezoelectric and electromechanical properties along <110> direction were investigated as a function of temperature. The Curie temperature was found to be ∼380°C with a rhombohedral…
Technical insulators, whether gas, liquid or solid, are largely characterized by unipolar ionic flow. The carriers are supplied by injection, or by bulk ionization, and the charge transport is space charge perturbed. The author discusses theoretical modeling of steady state, time dependent, and oscillatory conditions.…
Abstract Poly(ε‐caprolactone) (PCL), cellulose acetate (CA) and their blends were characterized by their tensile strength, differential scanning calorimetry (DSC) and optical microscopy (OM). The compatibility of the blends was investigated and the OM results showed that CA tended to disperse as discrete particles in…
The minerals of the rosenbuschite group are sorosilicates composed of a framework of 6- to 8-corner polyhedra and rows of Si2O7 dimers. The polyhedra combine into layers (O layers) and into ribbons by edge sharing. Heterogeneous layers (H layers), composed of the octahedra from the ribbons and the sorosilicate groups,…
The effect of 0.2 wt-%C on the microstructure of beta titanium alloys Ti-15X(Fe, Cr, Mn, Mo, Ni, Co, Cu, and V) has been studied using scanning and transmission electron microscopy. It has been found that coarse eutectic TiCx tends to be formed in beta titanium alloys containing Fe, Cr, Mo, and Mn, and relatively fine…
Abstract The objective of this preliminary work was to explore the fracture resistance of polytetrafluoroethylene (PTFE) (DuPont tradename Teflon) as part of materials characterization work related to the development of “reactive” material projectiles. Little mechanical property data is available on this material sinc…
Glasses of the composition 40 PbO–(60 − x) Sb2O3−x As2O3 :0.4 Cr2O3 (with x ranging from 10 to 55 mol%) were prepared. A number of studies, i.e. differential scanning calorimetry, IR spectroscopy, optical absorption, magnetic susceptibility, ESR spectroscopy and dielectric properties (constant ε, loss tan δ, ac conduc…
Benzocarbaporphyrins 4 were found to undergo regioselective oxidations with ferric chloride in methanol, ethanol, isopropyl alcohol, or ethylene glycol to give bridged benzo[18]annulene ketal derivatives 5 in excellent yields. These polar derivatives were generally isolated in a monoprotonated form and the correspondi…
Continuously variable ferroelectric (BST on sapphire) phase shifters based on all-pass networks are presented. An all-pass network phase shifter consists of only lumped LC elements, and thus the total size of the phase shifter is kept to less than 2.2 mm /spl times/ 2.6 mm at 2.4 GHz. The tunability (C/sub max//C/sub…
The strengths of metallic multilayers, composed of alternating layers of soft metals such as Cu and Nb, approach the theoretical limit of material strength when the bilayer periods are on the order of a few nanometers. We have investigated the damage mechanisms in these ultra-high strength nanolayered composite materi…
In NiMnGa alloy the crystal structure of low temperature phase is strongly related to transformation temperature. In the present study three NiMnGa alloys with different transformation temperatures were studied. Alloy A has the martensitic start temperature (M s ) near ambient temperature and M s of Alloy B is near Cu…
Efficient computational methods for the elastic field, self force and interaction forces of three-dimensional (3D) dislocations in anisotropic elastic crystals are developed for 3D dislocation dynamics (DD). The elastic field of a general dislocation loop is determined by incorporating numerically evaluated derivative…
Regenerated cellulose fibres have had an important role to play in the man-made fibre field. The very special characteristics of different types of regenerated cellulose fibres, e.g. mechanical properties, sorption characteristics, and aesthetics were conditioned by the differences in their fine structure due to fibre…
This paper describes a series of experimental studies to evaluate the performance of newly developed sensors for monitoring broadband acoustic emissions generated by acoustic cavitation. The prototype sensors are fabricated in the form of hollow, open-ended cylinders, whose inner surface is made from a thin film of pi…
We report here for the first time a new and improved approach to the complete synthesis and characterization of the unsymmetrical metallo- and metal-free phthalocyanine/porphyrazine (Pz/Pc) hybrids bearing peripheral nitro or amine functionality, H 2 [ Pz (n- Pr ) 6 ( BzNO 2 )] or H 2 [ Pz (n- Pr ) 4 ( BzNO 2 ) 2 ], w…
Abstract The effects of chitin/chitosan and their oligomers/monomers on the migrations of mouse peritoneal macrophage (PEM) and the rat macrophage cell line (rMp) were evaluated in vitro. In direct migratory assay using the blind well chamber method, the migratory activity of PEM was enhanced significantly by chitin a…
Abstract It is widely accepted that for the very smallest grain sizes (typically below 20–30 nm), dislocations play no significant role in the deformation of nanocrystalline materials. However, the grain-boundary mechanisms responsible for the reported decrease in strength with decreasing grain size in this regime (th…
The metamaterial considered is a planar wire-grid network loaded with closely spaced, orthogonal capacitors and inductors, positioned over a ground plane and parallel to it. Excited by a single-frequency point source, this metamaterial exhibits conical high-field regions called "resonance cones" which extend outward f…