The beryl crystal from Pingwu County,Sichuan Province that occurred on the low saturation,alkaline and pneumatogenic—thermal conditions,is characterized by the flat tabular shape.
The ACR "rifles" used smoothbore barrels to fire single or multiple flechette per round, rather than bullets, to provide long range, flat trajectory, and armor piercing abilities.
In this paper,the cam explorator in contour lathe is designed direct according to the contour of primary products with the mathematical analogue of the working course of the cam。
On condition that the front body shape of the projectile is unchangeable,a formula is obtained for determining the relation between the optimum boattail angle and the supersonic flight region.
The pastille system is consisted of rotoformer and cooler. The rotofomer drop the liquid on the belt evenly and the drop solidified as the belt is moving forward continuously.
It exhibits good wet handleability, is easily cut with scissors or a knife, can be applied directly to equipment with complex contours, and can also be used to fabricate flat sheets or boards.