This paper describes two-dimensional computer simulations of granular flow in plane hoppers. The simulations can reproduce an experimentally observed asymmetric unsteadiness for monodispersed particle sizes, but also could eliminate it by adding a small amount of polydispersity. This appears to be a result of the strong packings that may be formed by monodispersed particles and is thus a noncon...

The issues of research work seed metering devices by the method discrete elements (DEM) are considered. A 3d-model developed intended for use with an unmanned aerial vehicle is presented. Its main design parameters and characteristics virtual stand used in study described. brief description physical model interaction seeds working given. As a result study, data were obtained on capacity hopper ...

In the previous study, different structures of hoppers were proposed. And dust suppression performance evaluated. this paper, materials selected.And influence material on particle behaviors studied based discrete element method (DEM). Results shows that wall with low collision recovery coefficient for hopper has positive effect suppressing diffusion.and high static friction showed little flow s...

We introduce a new class of holomorphic polynomials extending the classical Gould–Hopper to two complex variables. The considered include 1-D and 2-D polyanalytic Itô–Hermite as particular cases. emphasize studying their operational representation, various generating functions, recurrence relations. also establish some special identities including multiplication, Runge addition Nielson types fo...

The Grasshopper Integrated Pest Management Project (GHIPM) WDS a S15 million projccllhat lasted from 1986 La 1994 to identify, develop, and implement rangeland grasshopper management tactics within the Framework of Integrated Pest Management (lPI\'I) in the western United Stales. Computer simulation has been used La fulfill many original objectives for GHIPM and help bridge the gap between theo...