In any metal forming process, both the strain rate and deformation rate depend on the die profile. The die profile also, is responsible for the non-uniformity of the deformation along the cross-section. These affect the quality and mechanical properties of the product. Therefore, if a die is designed, in which the affecting variables can be controlled spontaneously it is hoped to obtain a produ...

Conjoined twins are derived from the division of a single fertilized ovum; a phenomenon accompanied with multiple congenital anomalies. Such twins are identical, of the same sex, and more likely to be female. Most twins die during the embryonic period, and only 18% survive longer than 24 hours. There are complex anomalies in thoraco-omphalopagus twins that makes them unlikely to live long enoug...

densification of biomass material that usually has a low density is proper way to increasing density,reduce transportation cost and simplify storage and distribution of these materials. pellet productionusing extrusion process is a common method for densification. the goal of this research isoptimization of specific energy consumption for extrusion process considering its effect on pelletdensit...

Palm pruning residues are potential pellet raw material, which quite abundant in regions with hot climates. In pelletizing process, material properties and machine features the main factors affecting final quality. this study, 5 mm sieve hole diameter milled palm was pelleted using two different dies moisture. First die (D1) has 25 total length, 17° inlet angle 10 depth. The second (D2) 35 33° ...

The purpose of introducing ultrasonic vibrations in the tube hydroforming process is to create more formability by obtaining a lower corner radius, improve thickness distribution of the wall and provide good tribological conditions at the tube and the die interface. Vibrations imposed on the die create alternating gaps which improve the formability in the tube hydroforming process in the presen...

D = (V, A) mit Bo-gengewichten c a ∈ R, a ∈ A, einen gerichteten Kreis C einer zulässigen Länge |C| ∈ L mit minimalem Gewicht a∈C c a zu bestimmen. Dabei ist L die Menge der zulässigen Kreislängen. Das zugehörige Polytop ist das Polytop P L C (D) der längenbeschränkten gerichteten Kreise C in einem Digraphen D, das ist die konvexe Hülle der Inzidenzvek-toren der gerichteten Kreise C, die eine z...