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We have developed a method using a polyvinylidene fluoride (PVDF) polymeric sensor to monitor the leg movements of cockroaches. The PVDF sensor was coated with gold as electrodes. It was attached to the leg of a roach. The voltage signals generated through bending directly correlate to the movement of the legs. It was found that the output voltage was a function of the degree of sensor bending caused...
Film capacitors with energy densities of greater than 1 J/cc and suitable for millisecond and microsecond discharge applications requiring limited life have been characterized. A variety of polymer films have been tested in model capacitors storing and delivering hundreds of Joules of energy at voltages of 2-10 kV. Self-healing metallized film electrodes have been utilized in these designs to achieve...
Experiment has not revealed a systematic variation of either EI or JS with ρ, although the prestress effect, [(EI−Ep−)/Ep−] %, seems to vary linearly. This is thought to be fortu1touS. Bradwell et al.5 attributed breakdown to the establishment of a critical field at the cathode and conditioning to the modification of the cathode field by space charge, dependent on the conductivity. The present result...
It is currently believed that the extension of an electrical “tree” in solid insulation depends on the establishment of a plasma within an existing tubule. Thus, voltage is conveyed from the electrode to regions deep in the solid, which breakdown locally where the stress concentration is such that the intrinsic strength is exceeded. Evidently the electric strength of the gas in the tubules is an important...
There have been many reports in recent years of the premature failure of extruded polyethylene insulated cables. In seeking reasons for this it has become apparent that polyethylene under electrical stress will absorb water when in contact with it. Many accounts have been given of the deleterious effect of water on the electrical properties of the insulation, but little has been established about...
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