Abstract: A system for adding weight and clamping a bar, as non-exclusive example, a barbell collar, includes a weighted collar attachable to a clamp. The clamp may include configurations that mate with the weighted collar, for selectively retaining and removing the weighted collar from mate with the clamp.

Abstract: An aerofoil, comprises: a wall comprising an external surface, and an internal surface defining a cavity for receiving a cooling fluid in use; a first trench formed in the external surface, and a second trench formed in the external surface; a first passageway extending from a first passageway inlet in the cavity to a first passageway outlet in the first trench, and a second passageway extending from a second passageway inlet in the cavity to a second passageway outlet in the second trench; wherein the first passageway and second passageway intersect within the wall.

Abstract: The Direction of Arrival estimation algorithm ESPRIT is capable of estimating the angles of arrival of N narrowband source signals using M>N anechoic sensor mixtures from a uniform linear array (ULA). Using a similar parameter estimation step, the DUET Blind Source Separation algorithm can demix N>2 speech signals using M=2 anechoic mixtures of the signals. The present invention demixes N>M speech signals using M>=2 anechoic mixtures.