Materials Literature
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Methods of locating defects in overhead high voltage and extra-high voltage transmission lines are described and evaluated. Included is a technology which utilizes corona partial discharge detection to find faulty conditions while simultaneously performing routine visual inspections from a helicopter. The corona inspe…
Nearterm industrial applications require pressure sensors and acceleration sensors which are able to operate at elevated temperatures and in harsh environments where conventional silicon devices do not work. Many properties of diamond (e.g. its physical hardness, high Young's modulus, high tensile yield strength, chem…
From the mid-1950s to the present the major design concepts for bulk thermoelectrics were those used by A.V. Ioffe. These were to select semiconducting compounds of heavy elements from the lower part of the periodic table and then to reduce the lattice thermal conductivity by forming mixed crystals. This approach led…
The effect of water vapor and hydrocarbons in removing NO/sub x/ was experimentally studied by combining nonthermal plasma with various type of catalyst. Catalysts tested in this paper were copper-coated zeolite, and conventional 3-way catalysts. The combined process of the catalyst and the nonthermal plasma was exami…
This paper summarize results from work on diagnosis of medium voltage (MV) XLPE cables with respect to water treeing performed at KTH, Stockholm. The work, performed both in laboratory and in the field, has shown that high voltage dielectric spectroscopy is a good tool for diagnosis of MV XLPE cables and that it is ab…
Poly(3-(tert-butoxycarbonyl)-N-vinyl-2-pyrrolidone) has been synthesized and characterized by gel permeation chromatography, Fourier transform infrared spectroscopy, NMR spectroscopy, and thermal analysis. The polymer is a chemically amplified photoresist. Arrays of lines with 25 microm width and 25 microm spacing wer…
Surface reconstructions involving curved graphitic overlayer are proposed to be the missing transition state between the clean (2\ifmmode\times\else\texttimes\fi{}1)- and fully hydrogenated (1\ifmmode\times\else\texttimes\fi{}1)-diamond {111} surfaces. First-principles calculations show that surface graphitization cau…
This paper presents the first measurements of partial discharge current pulses captured using both a high analogue bandwidth and an extremely fast sampling rate. These pulses are of interest because when they occur in gas insulated substations they generate UHF signals that can be used to detect internal defects. A sp…
The nonlinear dielectric response of water tree degraded XLPE power cable insulation has been found to be an important additional diagnostic criterion. It has been experimentally shown that in case of long water trees the dielectric response increase more than proportional with increasing test voltage above a certain…
This paper describes the phenomenon of self-annealing of electrochemically deposited copper films. Sheet resistance was shown to decrease by approximately 20% within tens of hours after deposition at room temperature. At the same time, tensile film stress increased and X-ray diffraction results indicate a very large i…
This paper presents hysteresis current regulation techniques of four-wire loads under balanced and unbalanced conditions, using a three-phase inverter with a neutral leg. It has been shown that well known techniques of hysteresis current regulation used in conventional three-phase three-leg inverters, (three independe…
The new concept-plasma desorption-was developed which is able to convert the high-flow-rate and low-concentration emission to the low-flow rate and high-concentration emission. The unique method and apparatus developed were to desorb the adsorbed gas on pellets using nonthermal plasma and at the same time the adsorpti…
Molecular dynamics simulations of reactive compatibilization of polymer blends are performed for a wide range of chain lengths and densities of reactive groups ρ o . We directly observe the predicted diffusive growth as well as the saturation at later times. The crossover to the saturation regime is consistent with th…
Insulation materials used in high-voltage switched-mode power supplies are exposed to high-frequent high voltages. Ageing tests performed with high DC voltages or low-frequency high voltages might not reveal the true ageing effects which take place during rated operation at high frequency. Studies on different voltage…
In this contribution, we present results from a study of a field grading material, consisting of a matrix made of ethylene-propylene rubber (EPDM) filled with both silicon carbide (SiC) and carbon black (CB). The material properties have been electrically characterized and analyzed both at low voltage in frequency dom…
The time-resolved fluorescence kinetics of a first and a second generation dendrimer with peryleneimide chromophores at the rim and a terrylenediimide chromophore in the core were investigated using femtosecond fluorescence upconversion and single photon timing techniques. By global analysis of an extentensive data se…
[reaction: see text] The 2:1 inclusion complex between (2,3,6-tri-O-methyl)-beta-cyclodextrin (TMbetaCD) and 5,10,15,20-tetrakis(4-sulfonatophenyl)-porphyrin (TPPS(4)) behaves as a supramolecular sensitizer in water providing photooxygenation with turnover numbers up to 30,000 with a very minor sensitizer bleaching (<…
The crystal structure of the high molecular mass cytochrome c HmcA from Desulfovibrio vulgaris Hildenborough is described. HmcA contains the unprecedented number of sixteen hemes c attached to a single polypeptide chain, is associated with a membrane-bound redox complex, and is involved in electron transfer from the p…
Precise control of the structure of matter at the nanometer scale will have revolutionary implications for science and technology. Nanoelectromechanical systems (NEMS) will be extremely small and fast, and have applications that range from cell repair to ultrastrong materials. This paper describes the first steps towa…
Electrical breakdown at the interface of two dielectric surfaces is a major design consideration in underground cable accessories. The reliability of any given system essentially depends on its performance in aging. Several factors could affect the aging performance of a dielectric interface. The interfacial pressure…