Materials Literature
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The paper describes a non-destructive electro-optical diagnosis concept of partial discharges in solid dielectrics. The aim of the measurements is to localise the partial discharges, to gain information about the power density of the discharges and the correlation with the damage of the dielectric surface. This makes…
The pulsed electro-acoustic method was used as a nondestructive measurement technique of space charge distribution in dielectric materials. In our work presented here, we measured simultaneously the space charge distribution and conduction current in the low-density polyethylene samples with elevated temperatures up t…
Although the fast breeder reactor (FBR) was developed by many countries as the economical nuclear reactor, many countries have stopped developing FBR, except France and Japan, for economic reasons. Nuclear power is important for Japan as a source of energy, therefore Japan will continue to investigate nuclear energy s…
This paper is devoted to electrical and photoelectrical properties of silicon MIS structures with REO insulator such as yttrium, lutetium and samarium oxide films. Interface properties and barrier energies of metal-REO and silicon-REO interfaces are the subject of these investigations.
This paper describes the fundamental characteristics of EPDM (ethylene propylene rubber) which is applied as a high voltage insulation material. Also recently, polymer compounds have been applied as high voltage insulation materials. EPDM rubber is inferior in weather resistance to silicone rubber. However, we found t…
Ultrashort pulse pump−probe and transient anisotropy methods are used to study polaron dynamics of primary doped conductive polyaniline in solution. The degenerate frequency pulses are resonant with the polaron absorption of the emeraldine salt form of polyaniline. Pronounced oscillatory components with frequencies of…
A new reaction calorimeter has been developed for measuring the kinetics of reactions accompanied by small thermal effects. For kinetic purposes, the calorimeter was calibrated by simulating the heat flow in accord with a certain kinetic equation. This was accomplished by applying a software-controlled voltage to a re…
Medical grade silicone rubber has been developed for use as a material for the fabrication of medical implant devices. It has high performance, strength, elongation and very resistant to flaws and crack propagation with an excellent fatigue flex life. The toxicological/biocompatibility studies such as systemic toxicit…
Electrical treeing tests at divergent field are a tool for the characterization of insulating materials which has been extensively studied in the recent years. The divergent field is generally obtained by means of point plane electrode geometries, where the point (needle) electrode can be either conductive or semicond…
The acquisition, storage and processing of partial discharge (PD) signals is widely used as a condition monitoring tool to determine the integrity of the solid insulating systems of high power plants. Despite the advances in the instrumentation available for this purpose, the ability of partial discharge data to provi…
This paper presents the research aid development results on surface corona suppression systems in high voltage large generator stator winding end turns. Theoretical analysis on the physical phenomena of the surface corona in stator end turns is described. The important physical parameters of surface corona suppression…
Abstract The functionalization of polyethylene was realized by the thermal decomposition of peroxyesters in molten polymer in the absence of any other additive. Ester and acid functions were introduced onto the polymer operating with various peroxyesters. This grafting resulted from the combination of a polymer radica…
An investigation of hydrogen degradation of GaAs MMICs (MESFET, PHEMT and HBT) was conducted to determine the threshold hydrogen concentration for spacecraft application. The maximum hydrogen in the hermetic package is found to be 0.6 torr (based on 10 year mission at ambient temperature of 125/spl deg/C). Hydrogen ev…
The operation of SOI devices is limited by self-heating phenomena (SH) due to the low thermal conductivity of the buried oxide. Although much research has been carried out in this field, only recently a SH small signal model has been established versus temperature. However, no detailed analysis of the impact of SH eff…
Abstract In this study the PPS/ABS blend system was investigated in order to collectively identify the relationship among blend morphology, chemical compatibilization, and thermal property. The ABS resin was chemically modified by the incorporation of maleic anhydride through reactive extrusion for enhanced compatibil…
This paper describes a unique multichip module technology based on highly impermeable liquid crystal polymers (LCPs) to interconnect and package Microwave and Millimeter Wave Monolithic Integrated Circuits (MIMICs). Because of the low moisture permeability of the LCPs, the packages can be made hermetic without heavy e…
A procedure for modeling and simulation of arbitrary nonlinear magnetics devices is presented. A set of electromagnetic primitives is described as implemented in SpectreHDL. The primitives include cores, gaps, and windings that are combined to model ferromagnetic inductors and transformers. A ferromagnetic core model…
Polyferrocenylsilane nanorods were prepared using a porous anodic aluminium oxide template followed by chemical etching; pyrolysis was used to obtain magnetic iron oxide-containing ceramic nanorods.
An analytical method based on matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) has been applied to provide information on the structure of a copolymer, e.g., repeat unit and end group. Seven conjugated polymers, which have been demonstrated as the active component in blue lig…
l 1/2 -D and 2-D arrays offer a myriad of new imaging modalities and benefits when compared to the linear array. However, with added benefits come many problems and challenges and l 1/2 -D and 2-D arrays are no exception. The authors give possible solutions to a number of these challenges. The increase in transducer c…