Abstract: We present experimental results of a novel time-varying antenna to broadcast Very Low Frequency (VLF, 3-30 kHz) signals. The antenna consists of a 275-m long dipole interrupted with a ...

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Abstract: A submarine requires a small VLF antenna for reception while submerged. Since the propagation in sea water is nearly vertical (downward from the surface), the only operative types are ...

Mining and metals production, from a portfolio of assets that included bauxite, alumina, aluminium, copper, zinc, lead, silver, nickel, manganese and metallurgical coal.

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