For greater benefit, the railway freight requires operation of double-decked container trains, making the clearance under the railway overpass insufficient.

From purposes and clearance specifications of reserve runway, this paper points out the deficiencies in the airfield clearance regulations of reserve runway, and presents the composition of and the requirement for the reserve runway clearance area.

Detailed analysis was made on the civil airport clearance specification and its basis as well as main affecting factors.

On Childishness by Li Zhi in the Ming dynasty has connotations of five fields ; emptiness and nothing, naturalness , one moment of thought , for oneself and true feeling, namely, excluding traditional morality and ration.

In order to constitute reasonable maneuvering rules of turning for waterjet-drived ship,a steady/dynamic mathematical model of waterjet propulsion system is set up.

A method of calculate analysis of transversal stabilization for turning of oil tank truck with irregular elliptical section,inclusing the modeling with four arc, discriminantion of relative position between the liquid linie and the section curve,is in this paper introduced.

This paper analyses the structure characteristics of directly turning belt conveyors and gives out the design parameters and layout of the key component-turning pulley.