Abstract: An architectural building block including a generally triangular block having an outer wall, an inner wall disposed in substantially parallel configuration with respect to the outer wall and three side walls, each adjoining the outer wall and the inner wall. One of the side walls includes dual inverse mirror planes and each of the other two of which includes a single inverse mirror plane. At least one the side walls is configured to be positionable so as to mate with a side wall of an abuttingly disposed block, whereby curved structures may be constructed from a plurality of such blocks to form a dihedral angle between each set of two blocks. In one embodiment, the inner wall further includes at least one depression disposed on the inner wall of the block.

Abstract: An architectural building block including a generally triangular block having an outer wall, an inner wall disposed in substantially parallel configuration with respect to the outer wall and three side walls, each adjoining the outer wall and the inner wall. One of the side walls includes dual inverse mirror planes and each of the other two of which includes a single inverse mirror plane. At least one the side walls is configured to be positionable so as to mate with a side wall of an abuttingly disposed block, whereby curved structures may be constructed from a plurality of such blocks to form a dihedral angle between each set of two blocks. In one embodiment, the inner wall further includes at least one depression disposed on the inner wall of the block.

Abstract: Fuel sensor (100) and method for detecting physical properties of a fuel comprising a probe (10) and a circuit (110) having an oscillator arranged to apply multiple frequencies to the probe (10) and measure electrical properties of fuel proximal to the probe (10) in response to the applied multiple frequencies, wherein the circuit (110) has one or more outputs (160) arranged to indicate physical properties of the fuel, and wherein the one or more outputs (160) vary in response to the measured electrical properties. More particularly, fuel composition and level in terms of fuel, water and ice is determined by measuring dielectric relaxation.