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Multiple-sensor Synchronous data collection system was developed on the base of RS485 distributed single-chip and the sensors of resistance spot welding current, voltage, electrode displacement and electrode pressure met spot welding process real time monitoring. The results show that the incomplete fusion defects of aluminum alloy pulse spot weld can be judged by the electrode displacement range...
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...
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...
We use infrared microscopy to image the temperature profile of graphene field-effect transistors operating at constant source to drain current bias. We find a peak in the temperature profile, i.e. a ??hot spot?? appears near the drain (anode) electrode of the graphene sheet at high current while operating in the hole-doped regime. We shift the hot spot position on the graphene sheet by tuning the...
Transport properties of single and multiwalled carbon nanotubes, with the tube axes aligned along the bias current direction, have been studied as a function of the temperature and applied current. The experimental data are consistent with a model of charge transport governed by tunnel between potential barriers created at the connection between the nanotubes or bundles surfaces and modulated by thermal...
Due to its high complicacy and transitoriness and closeness, resistance spot welding (RSW), which is widely employed as a major sheet metal joining technology in automotive industry, has attracted specific attentions for computer simulations since last century. In this paper, four major RSW numerical models, namely thermal model, electro-thermal model, electro-thermo-mechanical model and electro-thermal...
Experimental investigation of electrode potential voltage drop in liquid metal magnetohydrodynamic(LMMHD) power generator is presented in the paper. Resistance between two electrodes were measured by micro-ohmmeter with 0~20 mOmega range in different apart distance of electrodes and contact surface area. The results show that the contact resistance between liquid metal and copper electrode is very...
This paper presents an investigation concerning the use of fundamental approximation analysis and a new lamp model for the prediction of the voltage over electrodes' filaments during dimming operation. The lamp model employed in this paper is based on equivalent resistances, which represent the electrodes' filaments and the gas column of a F32T8 lamp. Experimental results are presented in this paper,...
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