Disclosed is a semiconductor-on-insulator structure ) and method of forming the SOI structure so as to have sub-insulator layer void selectively placed so that capacitance coupling between a first section of a semiconductor layer and the substrate will be less than capacitance coupling between a second section of the semiconductor layer and the substrate. The floating gate first portion includes a sloped upper surface and a side surface that meet at an acute edge. The planetary gear comprises a ring gear fixedly mounted on an engine frame in the nacelle or on the member rigidly connected to said frame. The current estimation section calculates a current phase relative to an axis of the sensor phase based on \u03b1-axis current and \u03b2-axis current in a stationary coordinate system defined by a \u03b1-axis parallel to the sensor phase axis and a \u03b2-phase perpendicular to the sensor phase axis. A Hadamard transformation is then applied to the flipped vector to obtain a transformed vector. The compositions surprisingly provide improved hair colourant and bleaching compositions which deliver improved lift, lightening and colour delivery whilst minimizing damage which are easy to manufacture and have long shelf life stability.