Materials Literature
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In order to ensure optimal electrical performances of high voltage cable accessories an important aspect which determine both the steady-state long-term and impulse performances of the components, resides on the appropriate selection of the grading material. The use of a simple circuital approach, and significant cont…
Polymeric housings for high voltage insulators are usually made with compounds of rubbers (silicone and EPDM) filled with alumina tri-hydrate. In order to test these materials, a 5000 hours multistress aging test was achieved together with a two year exposure at Martigues natural site on the French Riviera. The test s…
Thermoelectric generators use the Seebeck effect to produce electrical power from a temperature difference caused by heat energy flow. In this paper the principle of using thermoelectrically converted heat energy for powering portable electronic equipment or charging its battery has been investigated for a lap-top com…
The application of high power density electronic components such as fast microprocessors and power semiconductors is often limited by an inability to maintain the device junctions below their maximum rated operating temperature. The junction temperature rise is determined by the thermal resistance from junction to the…
An automated high-frequency core loss measurement method based on the use of an impedance analyzer was discussed by P.M. Gradzki and F.C. Lee (see HFPC proc., p.108-15, 1991). This measurement setup is convenient to use in high-frequency core characterization, but has certain limitations for some types of core loss me…
The nature of freezing and melting transitions for a system of model colloids interacting via the Derjaguin, Landau, Verwey, and Overbeek potential in a spatially periodic external potential is studied using extensive Monte Carlo simulations. Detailed finite size scaling analyses of various thermodynamic quantities, s…
Electronic energy transfer between the S2 state of azulene as donor and the S2 state of zinc porphyrin as acceptor in dichloromethane and CTAB micelles has been investigated. In dichloromethane high S2–S2 energy transfer efficiency, which cannot be explained using the Förster theory, is observed. An inhomogeneous dist…
Abstract Using rice straw, bagasse, and cotton stalk fibers as reinforcing fillers in polyester composite was studied. The effects of fiber loading and fiber size on the modulus of rupture (MOR), modulus of elasticity (MOE), tensile strength, water absorption, and thickness swelling were investigated as well. The effe…
Smart materials such as piezoceramics and shape memory alloys (SMAs) exhibit significant hysteresis and in order to estimate the effect on open and closed loop control a suitable model is needed. One promising candidate is the Preisach independent domain hysteresis model that is characterized by the congruent minor lo…
[reaction: see text] A free porphyrin coupled on 2-deoxy-D-ribose was synthesized and incorporated into DNA via phosphoramidite chemistry. Substitution at the ends of a 5'-modified self-complementary duplex was found to be thermally and thermodynamically stabilizing. The porphyrin moiety strongly intercalates in the d…
A model for the capacitive effects in magnetic components for switch mode power supplies (SMPS) has been developed. It can be applied to multiwinding transformers. A finite element analysis (FEA) tool is used to compute the frequency behavior of the magnetic component, taking into account geometry and materials. The p…
Steady-state multiplicity was observed in the catalytic oxidation of mixtures of H 2 and CO over a cordierite monolith wash-coated with Pt/Al 2 O 3. Increasing the CO concentration or decreasing the H 2 concentration across the hysteresis limit results in extinction, whereas decreasing the CO concentration or increasi…
Serine hydroxymethyltransferase (SHMT) catalyzes the reversible cleavage of serine to form glycine and monocarbonic groups, essential in several biosynthetic pathways. The availability of crystallographic structures of SHMT from mesophilic organisms and information produced by the genomic projects prompted the analysi…
Statistical Electromigration Budgeting (SEB) is a novel method for setting and verifying electromigration (EM) design requirements for VLSI interconnect. SEB exploits the statistical nature of EM reliability to selectively supersede fixed current density design rules for some interconnect, allowing increased chip perf…
There are several polymers being used as extruded insulation in high-voltage power cables from 5 kV up to 500 kV. They include low density polyethylene (LDPE), crosslinked polyethylene (XLPE), tree-retardant crosslinked polyethylene (TRXLPE) and different formulations of ethylene propylene rubber (EPR). The ageing mec…
Shape memory alloy (SMA) based actuators have a number of attributes which make them useful for robotic applications. Unfortunately their response is relatively slow being limited by the speed with which the SMA can be heated and cooled. This paper describes two novel developments of the basic SMA actuator which impro…
An increasingly urgent topic for the realization of densely packed (mixed signal) integrated circuits is prevention of cross-talk via the substrate. The paper proposes a boundary element method (BEM) for calculating an admittance matrix for the substrate in order to analyze the parasitic coupling during layout verific…
In a nematic liquid-crystal cell, the molecules can be realigned by an ultrasonic wave, leading to a change in the optical transmission through the cell. We present a model for this acousto-optic effect, and show that the magnitude of this effect is controlled by a director-density coupling. We then measure the optica…
We present a quantitative evaluation of the influence of the electron transfer on the magnetic properties of mixed-valence polyoxometalates reduced by two electrons. For that purpose, we extract from valence-spectroscopy ab initio calculations on embedded fragments the value of the transfer integrals between W nearest…
New stereoregular cyclic polysilanols of the general formula [PhSi(O)OH]n (n = 6 and 12) have been selectively obtained in high yields by the reaction of cagelike oligophenylmetallasiloxanes with dilute solutions of hydrochloric acid at low temperatures. An alternative method was used to prepare cis-[PhSi(O)OH](4) fro…