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Surface excitations, shape deformation and the long-time behavior in a stirred Bose-Einstein condensate
The surface excitations, shape deformation and the formation of persistent
current for a Gaussian obstacle potential rotating in an highly oblate
Bose-Einstein condensate(BEC)are investigated. Vortex dipole can be produced
and trapped in the center of the stirrer even for slow motion of the stirring
beam. When the barrier angular velocity is above some critical value, the
condensate shape can be deformed remarkably according to the rotation frequency
due to the existence of plenty of surface wave excitations. After a long enough
time, a few vortices are found to be left either trapped in the condensate or
pinned by the obstacle, a vortex dipole or several vortices can be trapped at
the beam center, which enables the possibility of vortex manipulation.Comment: 5 pages, 4 figure
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Converting a CAD Model into a Manufacturing Model for the Components Made of a Multiphase Perfect Material
To manufacture the component made of a multiphase perfect material (including homogeneous
and multi heterogeneous materials), it CAD model should be processed and converted into
layered manufacturing model for further transformation of numerical control (NC) coding. This
paper develops its detailed approaches and corresponding software. The process planning is made
first and includes: (1) determining the build orientation of the component; and (2) slicing the
component into layers adaptively according to different material regions since different materials
have different optimal layer thickness for manufacturing. After the process planning, the layered
manufacturing models with necessary information, including fabrication sequence and material
information of each layer, are fully generated.Mechanical Engineerin
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