Materials Literature
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This paper illustrates the use of electric field calculations for evaluating the performance of porcelain post insulators in stations for AC system voltages up to 1200 kV. The electric field was calculated using a 3-dimensional commercially available computer package that is based on the Boundary Element Analysis meth…
Abstract Cellular polymer films are frequently employed for packaging, insulation, and printing. They can also be used as ferroelectrets in transducer applications. Here, we propose a preparation process for cellular polyethylene-naphthalate (PEN) films with the following steps: (1) foaming by means of supercritical c…
The unusual optical properties of noble metal nanoparticles were employed long before scientists could even conceive of nanoscale objects. The Lycurgus Cup, which is part of a collection at the British Museum and was likely made in the 4th century in Rome, is a prime example. The glass portion of this vessel contains…
The complex dielectric constant (ε∗) is reported for multiwalled carbon nanotubes (MWCNTs) up to 105 Hz as a function of ac-electric field amplitudes Erot (in phase and same frequency as the measurement) and Eac (different phase and fixed frequency with respect to the measurement). A slow relaxation process (mode 1) i…
Threshold switching effects play a critical role in phase change memory (PCM) devices, since they contribute to the programming (set/reset) times and may lead to unwanted disturbs during the read operation. This work presents a detailed characterization and modeling of transient effects of delay, switching and recover…
The AgCl-AgBr phase diagram was refined, and TlI-doped AgCl x Br y I1 − x − y crystals are grown. AgCl x Br y I1 − x − y crystals were characterized by physicochemical methods. Two types of single-mode IR cables were manufactured for operation at 10.6 μm, and their fundamental characteristics were calculated: the diff…
Abstract Clay minerals in chilled or brecciated margins (altered glass) and massive inner crystalline parts (mesostasis) of three basalt-hawaiite bodies from Mururoa Atoll (French Polynesia) have been studied in order to compare their chemical and mineralogical compositions. Polyphase assemblages comprise di- and trio…
Abstract Polypropylene (PP) films have been prepared through two different cast extrusion processes: one using a machine direction orientation (MDO) unit and the other stretching the films at the die under high cooling conditions (lab unit). Films for two PP resins different in molecular structure have been prepared u…
Deep cryogenic treatment at liquid nitrogen temperatures can enhance the wear resistance of tool steels. This article, first published in 1997, reports experimental investigations that have helped to clarify the underlying mechanisms.
We have previously reported (K,Na)NbO 3 (KNN) films, whose piezoelectric properties are the highest reported thus far. In this study, we investigate the detailed crystalline structures of these KNN films after deposition on Pt/MgO and Pt/Ti/SiO 2 /Si substrates by RF magnetron sputtering. The KNN film on Pt/MgO was ep…
The multiple functions of titanium dioxide (TiO2) in exterior PVC durability are reviewed. TiO2 absorbs UV light to protect the polymer from direct UV degradation, and provides light scattering for visible light for opacity and to mask the discoloration of PVC. In addition, TiO2 photocatalytically degrades the PVC sur…
Performance of underground XLPE cables in service is critical because of ageing mechanisms influences. One of the techniques to evaluate performance of aged and unaged underground XLPE cables is based on tan delta and capacitance measurements of the cable insulations. This study focuses on underground XLPE cables whic…
The transition of Fe3+ ions from the high-spin (HS) state (S = 5/2) to the low-spin (LS) state (S = 1/2) has been observed in the BiFeO3 multiferroic crystal at high pressures in the range 45–55 GPa. This effect has been studied in high-pressure diamond-anvil cells by means of two experimental methods using synchrotro…
The electron trap level of Cu-doped ZnO has been investigated. Films with Cu contents from 0.01 to 1 at. % were deposited by RF magnetron sputtering onto (0001)-oriented sapphire substrates at 300 °C, and annealed at 900 °C. The resistivity of these films was high and increased with increasing Cu content. Hall measure…
We report the importance of metamagnetism for the giant magnetocaloric effect in lanthanum manganites and the key role of oxygen deficiency for this phenomenon. It is found that La0.7Ca0.3−xSrxMnO3−δ samples with x=0.0, 0.025, 0.05, 0.075, 0.1, and 0.125 are orthorhombic (O) phase, while those with x=0.15, 0.175, 0.2,…
The major aim of comfort research is to find the comfort temperature for an individual or group. This subjective property can be evaluated by means of thermal conductivity as a physical characteristic of fabric. This phenomenon depends on many fabric parameters and it is difficult to study the effect of ones without c…
Nanoparticles of nickel-cobalt oxide are prepared by chemical co-precipitation method. The particle size is determined from X-ray diffraction studies and TEM image. The surface morphology is revealed by SEM image. The effect of sintering on the particle size is analyzed. The FTIR studies have been used to confirm the…
This paper describes important aspects of partial discharge (PD) diagnostics of distribution power cables. PD parameter were discussed under consideration of attenuation and dispersive effects of cable characteristics. Field experiences with PD diagnosis on paper insulated cables (PILC) and cables with cross linked po…
We measured the Raman and the infrared phonon spectrum of SmFeAsO polycrystalline samples. We also performed density functional theory calculations within the pseudopotential approximation to obtain the structural and dynamical lattice properties of both the SmFeAsO and the prototype LaFeAsO compounds. The measured Ra…
This paper deals with partial discharge (PD) causing degradation of XLPE cable joint and interfacial phenomena of XLPE/EPR interface due to artificial defects such as metal particles, needle-like void and fiber soaked with water. We measured aging time dependence of phase-resolved PD (phi-q-n) patterns and PD statisti…