The paper offered formula for widening the curve railway, concluded theoretic widening radius of curve railway and widening value, which offers reference for platelayer.
In this chapter, we partially solve the problem of inner radius of univalence for some parallelogram, applying the properties of extremal sets of Schwarz derivatives.
The minimum underbalance is independent of viscosity and compressibility and of reservoir fluids.It is a function of the formation porosity, permeability and radius of perforation channels.
The unsupported and unpressurized hose shall be capable of being formed to an inner radius of ten times the internal diameter of the hose without visible kinking.
Developed excogitates of two decumbence and one hovizoutal molding die, realized increasing height of branch pipe of heat pressure tee and reducing radius of synodical arc of tee.
In order to reduce the error in the calculation, this article raises a measure method to the radius of nonplastic circular arc which basis on the principle of geometry.
According to the formation principle of the tritubercular cycloid in this paper, the rotor, whose bore curve is the inner envelope line of the cycloid, is made with the solid radius vector.