Parametric and experiment studies of 3D auxetic lattices based on hollow shell cuboctahedron

With the development of modernization, the application of seamless tube becomes widespread. As the first process of seamless tube, piercing is vital for the quality of the tube. The solid round billet will be transformed into a hollow shell after the piercing process. The defects of hollow shell cannot be cleared in the following process, so a monitoring model for the quality of the hollow shell is important. But the piercing process is very complicated, and a mechanism model is difficult to build between the qualities of the hollow shell and measurement variables. Furthermore, an intelligent model is needed. We established two piercing process monitoring and fault diagnosis models based on the multiway principal component analysis (MPCA) model and the multistage MPCA model, respectively, and furthermore we made a comparison between these two concepts. We took three ways to divide the period based on process,K-means, and GA, respectively. Simulation experiments have shown that the multistate MPCA method has advantage over the MPCA method and the model based on the genetic algorithm (GA) can monitor the process effectively and detect the faults.

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A new formulation of the problem of the flutter of a hollow shell

Journal of Applied Mathematics and Mechanics ◽

10.1016/0021-8928(94)90104-x ◽

1994 ◽

Vol 58 (3) ◽

pp. 545-549 ◽

Cited By ~ 1

Author(s):

A.A. Il'yushin ◽

I.A. Kiiko

Keyword(s):

Hollow Shell ◽

New Formulation

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ChemInform Abstract: Synthesis of Mn2O3Homogeneous Core/Hollow-Shell Structures with Excellent Adsorption Performance.

ChemInform ◽

10.1002/chin.201235018 ◽

2012 ◽

Vol 43 (35) ◽

pp. no-no

Author(s):

Jie Cao ◽

Qinghe Mao ◽

Yitai Qian

Keyword(s):

Shell Structures ◽

Hollow Shell ◽

Adsorption Performance

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SELF-ASSEMBLY DRIVEN CRYSTALLIZATION IN KEPLARATE-TYPE POLYOXOMETALATES

Journal of Molecular and Engineering Materials ◽

10.1142/s225123731440005x ◽

2014 ◽

Vol 02 (01) ◽

pp. 1440005 ◽

Cited By ~ 3

Author(s):

KAPARAPU GOUTHAM ◽

ETHAYARAJA MANI

Keyword(s):

Self Assembly ◽

Replica Exchange ◽

Hollow Shell ◽

Hexagonal Close Packed ◽

Close Packed Structure ◽

Hexagonal Close Packed Structure ◽

Packed Structure ◽

Replica Exchange Monte Carlo ◽

Patchy Colloids ◽

Closed Shells

In this paper, we present direct evidences for two-stage mechanism of crystallization of patchy colloids from replica exchange Monte Carlo simulations. The patchy model colloid mimics the structure and interactions of a certain class of polyoxometalates (POM). We find that individual colloids self-assemble into two-dimensional sheets in hexagonal close-packed structure, and these sheets themselves stack to form crystals. The simulation explains the formation of hollow shell-like objects in POM solution [T. Liu, B. Imber, E. Diemann, G. Liu, K. Cokleski, H. Li, Z. Chen and A. Muller, J. Am. Chem. Soc.128, 15914 (2006)]. Simulation also predicted the formation of pentagonal caps that are essential for the formation of hollow, closed shells of POMs. Similar two-step crystallization of apoferritin protein was earlier found in experiments [S. T. Yau and P. G. Vekilov, Nature406, 494 (2000)]. The simulation study suggests nonclassical route to crystallization in patchy colloids.

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