Abstract: A two-way soil clearing device for single-ridge grapevine and a construction machine for mounting the device, comprising a frame part, a soil clearing mechanism, a distance measuring sensor, an expansion and contraction device and a control unit; the frame comprises a left side frame and a right side frame; the left side frame and the right side frame are provided with a soil clearing mechanism respectively and expansion and contraction devices; the distance measuring sensor is provided in front of the soil clearing mechanism; and the control unit is respectively connected with the distance measuring sensor and the expansion and contraction device. The present invention can flexibly remove the covering soil between the piles of the grapevine and the covering soil at the side of the grapevine at one time, and can operate on both sides of the same soil ridge at the same time during work.

Abstract: A power system state estimation method based on set theoretic estimation model may be provided. In this method, all prior information of state estimation in a power system at least including a network topology and network parameters of the power system may be collected. A set theoretic estimation model for state estimation in the power system may be constructed by initializing original intervals of state variables and measurements and extending measurement constraints by algebraic manipulations to eliminate pessimism. Interval constraints propagation may be performed until the constraints to the state variables may be contracted. And resulting intervals of the state variables and measurements may be output.