Abstract: The present disclosure relates to a system and a method for image reconstruction. The method may include obtaining a projection image of a subject acquired by an imaging device, the projection image including a first region with a normal exposure corresponding to a first portion of the subject and a second region with an overexposure corresponding to a second portion of the subject; using first pixel values of first pixels in the first region to correct second pixel values of second pixels in the second region; and reconstructing, based on the first pixel values of the first pixels in the first region and the corrected second pixel values of the second pixels in the second region, a target image of the subject.

Abstract: A method for analyzing a correlation between rail transit and direct current (DC) magnetic bias of a transformer includes the steps of, A: obtaining a current of a feed cable and a DC magnetic bias current: measuring the feed cable current in rail transit and the DC magnetic bias current of a transformer in a power grid within a certain period by a monitoring apparatus; B: calculating a characteristic quantity of the feed current within the measurement period based on the obtained current of the feed cable; C: calculating a characteristic quantity of the DC magnetic bias current within the measurement period based on the DC magnetic bias current; and D: calculating a support degree and a confidence coefficient based on the calculated characteristic quantity of the feed current and the calculated characteristic quantity of the DC magnetic bias current, and generating a correlation rule.

Abstract: A method for analyzing a correlation between rail transit and direct current (DC) magnetic bias of a transformer includes the following steps: A: obtaining a current of a feed cable and a DC magnetic bias current: measuring the feed cable current in rail transit and the DC magnetic bias current of a transformer in a power grid within a certain period by a monitoring apparatus; B: calculating a characteristic quantity of the feed current within the measurement period based on the obtained current of the feed cable; C: calculating a characteristic quantity of the DC magnetic bias current within the measurement period based on the DC magnetic bias current; and D: calculating a support degree and a confidence coefficient based on the calculated characteristic quantity of the feed current and the calculated characteristic quantity of the DC magnetic bias current, and generating a correlation rule.

Abstract: A MEMS microphone includes a silicon substrate, a diaphragm connected to the silicon substrate, a backplate opposed from the diaphragm for forming an air gap. The backplate defines a plurality of first through holes and a plurality of second through holes surrounded by the first through holes, each of the first through holes being formed by a straight boundary and an arc boundary, the radius of the second boundary being greater than half the width of the first boundary.

Abstract: A accelerometer includes a substrate define a stationary electrode thereon, a first moveable mass defining a conductive-layer thereon facing the stationary electrode, a plurality of first elastic elements coupled with a peripheral side of the first moveable mass, a first fixed element surrounding the first moveable mass and fixedly attached to the substrate, a plurality of first fixed electrodes extending outwardly from the first fixed element, a second moveable mass surrounding the first fixed electrodes, a plurality of first moveable electrodes extending inwardly from the second moveable mass toward the first fixed element and parallel to the first fixed electrodes, respectively, a plurality of second elastic elements coupled with a peripheral side of the second moveable mass, and a second fixed element surrounding the second moveable mass and fixedly attached to the substrate.

Abstract: A MEMS microphone includes a silicon substrate, a diaphragm connected to the silicon substrate, a backplate opposed from the diaphragm for forming an air gap. The backplate defines a plurality of first through holes and a plurality of second through holes surrounded by the first through holes, each of the first through holes being formed by a straight boundary and an arc boundary, the radius of the second boundary being greater than half the width of the first boundary.

Abstract: An tri-axis accelerometer is disclosed. The tri-axis accelerometer includes a mass, a first group of capacitance, a third group of capacitance being neighbor to the first group of capacitance. The mass defines an upper surface, a lower surface parallel to the upper surface and a side wall connecting the upper surface and the lower surface. The first group of capacitance includes a first movable electrode and the third group of capacitance includes a third movable electrode. The first movable electrode is perpendicular to the third movable electrode.

Abstract: A accelerometer includes a substrate define a stationary electrode thereon, a first moveable mass defining a conductive-layer thereon facing the stationary electrode, a plurality of first elastic elements coupled with a peripheral side of the first moveable mass, a first fixed element surrounding the first moveable mass and fixedly attached to the substrate, a plurality of first fixed electrodes extending outwardly from the first fixed element, a second moveable mass surrounding the first fixed electrodes, a plurality of first moveable electrodes extending inwardly from the second moveable mass toward the first fixed to element and parallel to the first fixed electrodes, respectively, a plurality of second elastic elements coupled with a peripheral side of the second moveable mass, and a second fixed element surrounding the second moveable mass and fixedly attached to the substrate.

Abstract: A diaphragm is disclosed. A diaphragm includes a vibrating member capable of vibrating relative to the backplate and suspended by the supporting member extending from the vibrating member. The supporting member extends from a periphery of the vibrating member along a direction away from the centre of the diaphragm. The supporting member defines a first surface, a second surface facing to the first surface, a side wall connecting the first surface and the second surface. And the side wall defines a first side wall and a second side wall facing to the first side wall. The supporting member defines a first groove, a second groove. Along a direction parallel to the vibrating member, the first groove extends from the second side wall to the first side wall, with a first placket in the first side wall, and the second groove extends from the first side wall to the second side wall, with a second placket in the second side wall.