Sigma has announced a second-generation version of its full-frame 35mm F1.2 'Art' lens, after teasing that it was coming ...

Hot on the heels of the stabilized 200mm F2, Sigma is releasing another first for mirrorless systems: the 135mm F1.4 DG Art.

Abstract: Active Noise Control (ANC) is an effective technique for removing undesirable disturbances based on destructive interference between two noises (i.e., the superposition principle). To reduce ...

Abstract: The use of a non-conventional linear programming technique, involving a piecewise differentiable penalty function minimization, is presented in this paper in connection with power system ...