The present disclosure generally relates to therapeutic nanoparticles. The electronic circuitry includes a number of mixers, each of which is configured to mix a Local Oscillator signal generated from a Voltage Controlled Oscillator with a signal received at an antenna element of the retro-directive antenna array. The portable spill containment system includes a flexible bag configured to contain spills or leakage from the one or more containers that pass through the drain holes of the grate. The inverter does not require an isolation transformer and can be connected directly to a 480277 Vac utility grid.