The fire extinguisher booth has lateral concave-convex vertical the parting surface,in the ordinary circumstances,the injection mold need side core-pulling mechanism,but regarding this part,using the elastic forcefully ejection,designed no side core-pulling mechanism,the manufacture is easy,and cost is reduced.

Through designing the injection mold with 16-cavity for the inner cork of oil bottle, the ejection method of the plastic part with lateral uplift was introduced.

The demoulding method of the plastic part with lateral uplift was introduced.

Analysis of elderly people s discrimination capability on bumpy roads;

The concave-convex property of a surface is one of the important and classical issues in differential geometry.

This article present the continuity,differentiability,monotonicity,concave-convex,parity and periodicity of the function netermined by the definite integral of variable upper limit and variable lower limit,establishes the sufficient and necessary requirements of functional convex and integrability of derived function by using the definite integral of variable upper limit.

Some definitions and discriminating methods have been given on the monotonicity,extreme value,concave-convex and inflection points of the curve r=r(θ).