The equations of critical velocity are derived for horizontal pneumatic transport under three constraint conditions(the mass flux of solid and the pipe diameter,the mass flux of solid and the mass flow ratio of solid to gas,the mass flow ratio of solid to gas and the pipe diameter are respectively set to be constant).

The development direction of optimizing interface integrating technology of BF/BOF route was investigated by analyzing the production organization parameters, the mass flow-rate, time and temperature of BF/BOF route at Shagang, and the features of the multi-dimensional mass flow control with one open ladle from BF to BOF were studied.

The logistics quality connotation and its particularity are analyzed,and the quality of logistics corporations should be measured mainly in terms of logistics time,logistics cost,and logistics efficiency.

The paper builds up the structure model of logistics quality chain, analyzes the possible risk, establishes the index system of logistics quality chain risk and gives out the fuzzy hierarchy analytic method for the risk.