Materials Literature
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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…
A survey of magnetic core material models is the first step in an effort to identify those suitable for power electronics applications. This paper classifies many of the existing magnetic material models and outlines some of their main features.>
Ceramic Column Grid Array (CCGA) technology was introduced by IBM several years ago. The purpose of the Column Grid Array (CGA) technology was its improved reliability compared to the Ball Grid Array due to height and compliance. This paper describes several process improvements in fabricating the columns onto the sub…
Electrochemical deposition has traditionally been employed to grow metal coatings (plating) and to fill molds (electroforming). However, by localizing electric field or inducing local convection on a conducting substrate it is possible to write patterns without employing masks or molds. Here we present techniques capa…
The mechanism of methanol oxidation over highly dispersed 1% MoO 3 /SiO 2 was studied using a combination of steady state and transient kinetic measurements together with in situ Fourier transform infrared (FTIR) observations of surface-adsorbed species. The main reactive intermediates were methoxide species formed on…
A novel shape memory alloy (SMA) actuator consisting of a number of thin NiTi fibers woven in a counter rotating helical pattern around supporting disks is first described. This structure can be viewed as a parallel mechanism used to accomplish a highly efficient transformation between force and displacement. The actu…
Abstract Amidoximated bagasse (Am‐B) was prepared by treating sugarcane bagasse fibers with acrylonitrile in the presence of sodium hydroxide followed by aqueous hydroxyl amine. Adsorption of some heavy metal ions, namely, Cu(II), Hg(II), Ni(II), Cr(III), and Pb(II) on the prepared Am‐B at different metal ion concentr…
This paper describes two complete electric models that characterize transformer windings. The models have the geometric information of the magnetic component and give accurate results for high frequency simulations. Both models are derived from Maxwell equations and the expressions to calculate the electric parameters…
The title hydride and its deuteride were successfully synthesized. The heavy atom structure and hydrogen positions were determined respectively by X-ray powder diffraction and time-of-flight neutron powder diffraction. They crystallize with a new monoclinic structure in space group I2 (No. 5); cell parameters: a = 12.…
The introduction of uncooled microbolometer infrared (IR) technology is rapidly changing the face of IR imaging for both military and commercial users. Needs previously met with many high cost systems based upon photoconductive technology, image intensifier tubes, scanned FLIRs, or commercially available staring MWIR…
The pulsed electroacoustic (PEA) method we developed to measure the space charge distribution (1985) has been widely used for 10 years. This paper proposes a new measurement system that uses a modified electrode arrangement, an improved piezoelectric sensor, and a suitable amplifier. The resolution is about ten times…