Electrical resistivity tomography Electrical resistivity tomography Electrical resistivity tomography (ERT) or electrical resistivity imaging (ERI) is a geophysical technique for imaging sub-surface structures from electrical resistivity measurements made at the surface, or by electrodes in one or more boreholes. If the electrodes are suspended in the boreholes, deeper sections can be investigated. It is closely related to the medical imaging technique electrical impedance tomography (EIT), and mathematically is the same inverse problem. In contrast to medical EIT, however, ERT is essentially a direct current method. A related geophysical method, induced polarization (or spectral induced polarization), measures the transient response and aims to determine
Electrical Water Pageant the Main Street Electrical Parade at Disneyland, an oscillator swoop was heard during the music transitions in the Electrical Water Pageant. The 1972 to 1976 lineup of floats for the Electrical Water Pageant were: With the return of the Disneyland Main Street Electrical Parade in an updated form along with the brand new Walt Disney World Main Street Electrical Parade, a new version of Jean-Jacques Perry & Gershon Kingsley's "Baroque Hoedown" was created in 1977 to be used with both parades respectively featuring an updated rendition of Barque Hoedown recorded by Don Dorsey. To help distinguish the Electrical Water Pageant