Aiming at the powder overflowing from spray chamber in electrostatic powder spraying, the cause and mechanism of powder recovery system were analyzed.

Based on exposured geologic phenomenon of Yamansu iron deposit in Xinjiang after being explored for many years, this paper refutes the existing viewpoints on its origin, devises new argumentation from many aspects that accords further with its nature, and raises an idea that the deposit is a volcanic extrusion-overflow melted- separate deposit on seabed.

Modified-density flow and shedding flow sediments and their petroleum exploration significance in Yinggehai basin;