Abstract: The present disclosure relates to cell geometries for use in panel designs which may allow for an increased amount of energy absorption under lateral loading, as well as axial loading. The cell geometry that may withstand more energy from different angles as compared to standard honeycomb geometry. This cell geometry may be employed as a core of repeating cells to provide an increased amount of energy absorption under lateral loading in addition to energy absorption under axial loading. The cell geometry may be composed of a portion having a squared cross-section, but with internal diagonal walls, which are neither fully parallel nor perpendicular to the cell axis. This configuration is believed to possibly increase stiffness and energy absorption of a resulting core in the lateral direction.

Abstract: In a sub-soil prospecting process a vertical magnetic field transmitter dipole and a receiver dipole are placed on the ground, away from each other. The receiver dipole is oriented to detect a radial horizontal magnetic field relative to the transmitter dipole. At low frequencies, the magnetic field detected assumes asymptotic values, and by measuring these values an apparent alternating current resistivity of the sub-soil is deduced. By varying the transmitter-receiver distance, and by simultaneously using a direct current electric prospecting process, a sub-soil model is determined which is less ambiguous than those supplied by electric or induction prospecting alone.