Materials Literature
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We discuss the validity of standard retrieval methods that assign bulk electromagnetic properties, such as the electric permittivity epsilon and the magnetic permeability mu, from calculations of the scattering (S) parameters for finite-thickness samples. S-parameter retrieval methods have recently become the principa…
We discuss the possibility of a pyroelectric effect in a nonpolar solid. The built-in electrical field of a p–n junction barrier creates a polar axis in the solid. The electric dipole moment, due to the charge separation at the junction, depends on temperature mainly via the temperature dependence of the dielectric co…
Underwater manned vehicles and remotely operated unmanned vehicles require for their construction materials that do not corrode in the marine environment, and do not contribute significantly to the weight of the structures. One of such materials is acrylic (polymethyl methacrylate) that, in addition to the above attri…
Purpose To show the effect of organic compounds containing O and N atoms on the corrosion inhibition of Cu in HNO 3 and; the effect of some donating substituent groups on the corrosion inhibition. Design/methodology/approach A range of published papers (1956‐1995), which aim to discuss the effect of organic compounds…
The paper presents the results of a study on the use of high dielectric constant silicone housing compositions on composite bushings to shape the electric stress in the vicinity of the mounting flange, thereby eliminating the need for separate grading rings or capacitor foils. The materials studied are various mixture…
The objective of This work is to validate the electric field measurement technique for the diagnosis of nonceramic insulators (NCI). To validate this technique, fifteen NCI were aged in a salt fog chamber by applying nonstandard methods. Before ageing the NCI, the electric field distribution along each insulator was m…
Atmospheric plasma polymerization of perfluorohexane was investigated in this letter. A large quantity of single-crystalline polytetrafluoroethylene (PTFE)-like nanotubes were formed on a simultaneously deposited film at room temperature without any catalysts or templates. The outer diameter of the nanotubes varied fr…
The Ginzburg number Gi of deuterated poly(butadiene) (dPB) and poly(styrene) (PS) homopolymer blend of critical composition mixed with a dPB-PS symmetric diblock copolymer was determined from small angle neutron scattering. A 3 orders of magnitude change of Gi was determined between binary polymer blend and diblock co…
The coupling effects on the acoustic signature from nonlinear oscillations of a group of microbubbles is investigated. In general, exploring this phenomenon would require solving a set of (linearly) coupled nonlinear ordinary differential equations (\lowercase {ODE}s). However, assuming that the initial conditions of…
The crystal structure and magnetic properties of $\mathrm{Sr}{\mathrm{Ru}}_{1\ensuremath{-}v}{\mathrm{O}}_{3}$ samples annealed in air $(v=0)$ and high oxygen pressure ($v=0.02$ and 0.09) were studied as a function of temperature between $10\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and room temperature. Neutron powder di…
In 1997 a FRP hot stick flashed over during live line work at 550 kV AC. In spite of improvements in the maintenance and testing of the hot sticks, a second flashover occurred during similar work in 2002. A low level of surface pollution is believed to have been the cause of the more recent flashover. Laboratory tests…
This work reviews data acquisition, transmission and processing methodologies for continuous on-line monitoring of partial discharges in power cable systems. A PD continuous online monitoring system for underground cable circuits using capacitive couplers, LiNbO/sub 3/ electro-optic modulators, laser, optical switch a…
Purpose The evaluation of Schiff bases derived from o ‐, m ‐ and p ‐aminophenols and salicylaldehyde as corrosion inhibitors of zinc in sulfuric acid and to study their action mechanism. Design/methodology/approach The effect of various parameters on the behaviour of these inhibitors has been studied using the weight…
Ferroelectric random access memories (FeRAMs) combine very attractive properties such as low-voltage operation, fast write and nonvolatility. However, unlike Flash memories, FeRAMs are difficult to scale along with the CMOS technology roadmap, mainly because of the decrease of available signal with decreasing cell are…
Nanowires with 10 nm in diameter and several microns in length have been synthesized by ion exchange reaction of Na2Ti3O7 in KOH aqueous solution, and the structure of these nanowires has been determined to be K2Ti6O13. It was shown that the nanowires were formed as a result of strain induced phase transformation from…
We propose a novel MOSFET design that embodies single-wall zigzag semiconducting carbon nanotubes (CNTs) in the channel. Investigations show that CNTs have high low-field mobilities, which can be as great as 1 /spl times/ 10/sup 5/ cm/sup 2//V/spl middot/s. Thus, we expect that MOSFET performance can be improved by em…
We present a simple model for an associating liquid in which polymorphism and density anomaly are connected. Our model combines a two dimensional lattice gas with particles interacting through a soft core potential and orientational degrees of freedom represented through thermal "ice variables." The competition betwee…
We investigate automatic classification of protein crystallization imagery, and evaluate the performance of several modern mathematical tools when applied to the problem. For feature extraction, we try a combination of geometric and texture features; for classification algorithms, the support vector machine (SVM) is c…
One of the key challenges in the thermal management of microelectronic devices is interfaces such as those between the chip and heat spreader and between the heat spreader and heat sink or cold plate. Typically, thermal interfaces are filled with materials such as thermal adhesives and greases. Interface materials red…
The paper presents a method to optimize the location and the dimensions of the corona ring for transmission line composite insulators using finite element based software, FEMLAB. The procedure used to optimize the corona ring design, which handles more than one parameter, has been verified with examples that have an a…