A magnesium cylinder head cover die casting was produced to study systemically the influence of the velocity and start position of high-speed injection stage on the pressures in the mold and the quality of magnesium alloy die casting using pressure sensor.

Study on fracture initiation pressure and fracture starting point in deviated wellbore with perforations;

the existing structure design code only specifies the scope of reinforcing area in the bottom of shear wall,but does not definite the initial position.

According to the strain of the concrete interslabs,the paper puts forward the mechanism of punching failure of slabs and the best bending position of punching bent up reinforcement.

In this paper an OFDM start position estimation algorithm based on correlation accumulation is provided to reduce the inter symbol interference as much as possible and is applied to WLAN 802.