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Influence of the additional second neighbor hopping on the spin response in the t-J model
The influence of the additional second neighbor hopping t' on the spin
response of the t-J model in the underdoped and optimally doped regimes is
studied within the fermion-spin theory. Although the additional second neighbor
hopping t' is systematically accompanied with the reduction of the dynamical
spin structure factor and susceptibility, the qualitative behavior of the
dynamical spin structure factor and susceptibility of the t-t'-J model is the
same as in the case of t-J model. The integrated dynamical spin structure
factor spectrum is almost t' independent, and the integrated dynamical spin
susceptibility still shows the particularly universal behavior as
.Comment: 12 pages, Latex, Four figures are included, final published version
[accepted for publication in Phys. Rev. B (July 1 issue)
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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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