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This paper presents a novel method to detect the volt-ampere characteristic of vacuum arc. Highlights of this paper can be concluded that: the basic structure, computation models, designing principles and procedure, and selection criterions of materiel and electromagnetic parameters of the coil are analyzed respectively. The main clue of this paper is the operating principles of the Rogowski Coil...
We fabricated gated 40,000-tip HfN-FEAs and evaluated HfN-FEA as an active device. The vacuum transistor has triode structure of a gated HfN-FEA and collector electrode. This vacuum transistor has collector current of 1.1 mA, transconductance of 0.27 mS, collector resistance of 2.8 MΩ and voltage amplification factor of 750 when applying emitter voltage of 58 V. This vacuum transistor amplified ac...
Means of testing the integral nonlinearity (INL) of A/D converters (ADCs) without an accurate test stimulus have recently been proposed. These methods are based on a constant DC offset between two low-quality test signals. We describe here an on-chip offset generator and analyse its limitations. Experimental tests show that it can be used to test the INL of 12-b ADCs.
Tungsten trioxide (WO3) thin films with Pt and Cu electrodes are characterized regarding the suitability for nonvolatile memory applications. Cells down to 70 ?? 70 nm2 are fabricated by a combination of e-beam and nanoimprint lithography. The electrical measurements reveal good properties with switching currents of only 500 nA, fast SET and RESET switching down to 5 ns and retention for 104 s with...
A novel on-load tap-changing (OLTC) regulator for electrolytic process is proposed in this paper. The thyristors are used to substitute tap regulating switches. By measuring the voltage and current of power system and the load fluctuation of electrolytic bases, the number of groups of transformerpsilas windings which should turn on or off and the position of tap switches can be obtained. Then according...
For the first time, damage thresholds for TMR and GMR read sensors were measured using pulses with widths ranging from 40 ps to 2.3 ns. The ultra-fast pulses were generated using a novel Ultra-Fast Transmission Line Pulsing (UFTLP) system. The damage voltage level for the TMR and GMR heads was about 0.6 V using 2.3 ns-wide pulses, and increased to about 2.0 V using 40 ps-wide pulses. However, the...
Summary form only given. Surge tests were performed to derive a generator model considering its frequency characteristics. Impulse voltages were applied to one terminal of the generators after placing a variable capacitor at the same terminal. The inductances and the core-loss resistances of a generator model can be determined from the measured oscillating voltages. This paper presents a generalization...
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