It is well known that increased surface roughness of SF6 insulated electrode arrangements is significantly lowering the breakdown voltage [1], [2]. This effect becomes stronger with rising pressure and homogeneity of the electrodes. Since each breakdown changes the surface condition of the electrodes, it becomes very ambitious to measure breakdown probabilities in a statistical meaningful way. ...

Chaotic current fuctuations have been observed in the negative differential conductivity region of n-GaAs at 4.2 K under static external conditions. Power spectra, Poincar6 sections and the fractal dimension of the attractor were determined as functions of the applied voltage for various magnetic-field strengths B. For B = 0 only limit cycles were observed. For B > 0 our results indicate succes...

Contaminants in transformer oil insulation can float when meeting several conditions. Then, the presence of floating contaminants affects electrical characteristics insulation. Therefore, pre-breakdown (corona) and breakdown due to metallic particles would be investigated. This test used DC high voltage stress. A 56 Ω resistor was connected oscilloscope detect corona currents. The camera captur...

Significant reduction of the breakdown threshold in a DC microdischarge via seeding metal nanoparticles has been demonstrated. Compared to standard Paschen curves in dry air, reductions in the breakdown voltage of 5% to 25% were obtained for PD values (the product of pressure and electrode gap distance) ranging from 20 to 40 Torr-cm by seeding aluminum and iron nanoparticles with mean sizes of ...

This paper discusses two different modes of breakdown in the reverse-biased I–V characteristics observed generically in bipolar junction transistors sBJTsd with the base emitter shorted, showing an erratic behavior, in the presence of large displacement currents. Experimental observations related to reverse-biased collector junctions of BJTs, that exhibit two different states of breakdown when ...

The degradation of ultrathin oxide layers in the presence of a stress voltage is modeled in terms of two antagonist percolation processes taking place in a random resistor network. The resistance and leakage current fluctuations are studied by Monte Carlo simulations for voltages below the breakdown threshold. An increase of excess noise together with a noticeable non-Gaussian behavior is found...

An experimental program has been initiated to study dc breakdown in vacuum up to 300 kV without reliance upon preconceived conviction« of what are the mechaniami or participating factors. A range of possible factors previously reported to be influential in determining vacuum breakdown voltage was chosen with a view to studying their effects and interactions using the techniques of factorial exp...

A thermo-morphic transition of a silicon nanowire (Si-NW) is investigated in vacuum and air ambients, and notable differences are found under each ambient. In the vacuum ambient, permanent electrical breakdown occurs as a result of the Joule self-heating arising from the applied voltage across both ends of the Si-NW. The resulting current abruptly declines from a maximum value at the breakdown ...

The dielectric breakdown property of ultrathin 2.5 and 5.0 nm hafnium oxide (HfO2) gate dielectric layers with metal nitride (TaN) gate electrodes for metal oxide semiconductor (MOS) structure has been investigated. Reliability studies were performed with constant voltage stressing to verify the processing condition effects (film thicknesses and post metal annealing temperatures) on times to br...

Ozone generation efficiency is often used as an indictor to evaluate the performance of DBD reactors. This study aims to provide a general guideline for designing cylindrical DBD reactors with better performance based on the ozone generation efficiency. In addition to experiments, a numerical model is developed in this study. Specific energy density, defined as the ratio of deposited power to f...