Based on the study and analysis of Y-shaped atomizers and their atomization mechanism, a new-type of fan-shaped spray atomizer is developed and experimentally studied.

Through analysis 49 inclined basin large-angle fan seam to fifth coal mine of Fengfeng mining bureau,mining working isn′t safety with conventional trapezoid support, it isn′t rational,too in economy, coal getting working can′t be contented irregular trapezoid section I-steel support is adapted at first,it solves technical problem of mining,and gains good ecomomic and social result.

This paper proves that the coronas of fans are sequential graphs.

A practicable analytic solusion is obtained for any sector by means of Fourier series with singular items.

Slab CCM segment suspension system design;

Soft reduction technology for thick slab continuouscasting as well as the soft reduction segment;

Research for segment rollers of slab caster;