A dwarf nova, AL Com, was photometrically observed during an outburst in 1995 April, which occurred for the first time since 1975. The star showed two distinct types of periodic variation: (1) a 0.05666-day variation with decaying amplitudes during the earliest stage of the outburst, and (2) 0.0572-day super humps which grew ∼ 11 d after the onset of the outburst. The present observations are the one first to clearly established the SU UMa-type nature of AL Com. Furthermore, the appearance of these two periods, together with the whole course of the superoutburst, makes AL Com an almost perfect twin of an enigmatic dwarf nova, WZ Sge. We attributed the former period to be the orbital period of this cataclysmic binary. The double-humped profile of this variation seems to preclude an explantion based on an enhanced hot spot by a mass-transfer burst from the secondary, which has been believed to be the best observational evidence of a mass-transfer burst in WZ Sge obtained during its 1978 outburst.
Ne present a new MEMS probe card made of electroplated Vi micro-cantilevers, which has compliant structures, and ises a kind of electric breakdown, or fritting, to make :lectric contacts to electrodes on ICs. The characteristics ,f fritting contact between Ni probe and AI electrodes Nere investigated, and Ni was found to have lower contact .esistance than other materials. A micro-machining irocess for the probe cards, including deposition of layers laving different internal stress to make a protruding :antilever shape, was developed.
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