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We demonstrate a non-intrusive method of measuring electric fields in arbitrary gases using second harmonic generation. This simple method allows for sub-mm spatial and femtosecond temporal resolution with high sensitivity.
We present an approach to improving the efficiency of obtaining samples over a given domain for the peak location of Gaussian line-shapes. The method uses parameter estimates obtained from previous measurements to determine subsequent sampling locations. The method may be applied to determine the location of a spectral peak, where the monetary or time cost is too high to allow a less efficient search...
We characterize the electrical properties of a biocompatible nanocomposite which will be used as a stress sensing material in an instrumented knee implant. The composite is fabricated from multi-walled carbon nanotubes and ultra high molecular weight polyethylene. Experimental cyclic compression loading shows that the composite's resistance exponentially decreases with increasing compression stress,...
Plasma-assisted ignition technology has been proposed to boost the combustion efficiency of scramjets during high speed flight. One technique utilizes high-voltage nanosecond-duration pulses, which can generate free radicals thereby initiating ignition earlier in the combustion chamber and improving fuel efficiency. A high-voltage nanosecond pulse generator is an integral part of the system.
The development of a single switch cell for a modular nanosecond pulse generation system is described with the proposed use in plasma-assisted ignition for scramjets. Using the inductive voltage adder topology and high voltage MOSFETs, the proposed system can generate nanosecond pulses with variable duration from 20 ns to 50 ns, fast rise time (< 6 ns), fast fall time (< 6 ns) and variable amplitude...
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