The pellet-type SnO2 sensor was synthesized by the solid state method and the effects of additives such as nano ZnO (1-12 mol %) and nano In2O3 (1-10 mol %) on the CO gas sensitivity of sensor were investigated. The optimum sintering temperature was chosen 800°C because of the porosity content of the samples. The phase analysis and microstructure of the samples were studied by x-ray diffraction...

It is widely believed that magnetic reconnection plays an important role in various eruptive phenomena of space and astrophysical plasmas. The mechanism anomalous resistivity, however, has been open unsolved problem. chaos-induced resistivity proposed by Yoshida (1998) one possible mechanisms for resistivity. By use the test particle simulation, present work studies different configurations fie...

It is generally difficult to identify fluid types in low-porosity and low-permeability reservoirs, the Chang 8 Member Ordos Basin a typical example. In of Yanchang Formation Zhenyuan area Basin, affected by lithology physical properties, resistivity oil layer water are close, which brings great difficulties type identification. this paper, we first analyzed geological petrophysical characterist...

Electromigration activation energy is measured by a built-in sensor that detects the real temperature during current stressing. Activation energy can be accurately determined by calibrating the temperature using the temperature coefficient of resistivity of an Al trace. The activation energies for eutectic SnAg and SnPb solder bumps are measured on Cu under-bump metallization (UBM) as 1.06 and ...

The formation and thermal stability of nickel germanide on germanium substrate were examined by both electrical and physical characterization methods. Low resistivity (14 m cm) mono-nickel–germanide was formed at a low temperature of 400 C on Ge substrate. The sheet resistance of nickel germanide changed with the germanide formation temperatures and had a similar characteristic as nickel silici...

Continuous vertical electrical sounding (CVES) surveys were carried out on KNUST campus to ascertain the electrical properties of the formations in the area in order to determine its suitability for the construction of heavy structures. Eight 2D CVES profiles were conducted at the site in the study area with a wenner array using electrode separations of 1, 2.5 and 4 m. The apparent resistivity ...

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An experimental investigation is conducted to measure and correlate the impact of water content on electrical characteristics mineral oil for transformers, particularly breakdown voltage, resistivity, dielectric dissipation factor. Regression method carried out compare results obtained through laboratory experiments with those predicted using an analytical model. A treatment reduce in involving...

The results of studies on the development technological methods for formation low-resistivity contact systems to n- and p-SiC based single multilayer Ni-, Al- Ti-compositions 4H-SiC bipolar devices are presented. It is shown that contacts Ni n-4H-SiC (rho c =3.6·10 -4 Ohm·cm 2 ) Ni/Al p-4H-SiC =5.9·10 -5 possible within a cycle vacuum annealing at 1000 o C 120 s. This solution makes it reduce n...