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First principles molecular dynamics simulations for amorphous HfO2 and Hf1-xSixO2 systems

100%

Ikeda M. , Kresse G. , Nabatame T. , Toriumi A.

tom Vol. 23, No. 2

401--406

Amorphous phases of HfO2 and Hf1-xSixO2 were obtained using the Projector Augmented Plane Wave method through the melt and quench technique. For the pure HfO2 system, several pore channels appear in the structures. Changes to x in the Hf1-xSixO2 were also studied. As the concentration of Si increases, the size of the pore channels increases, much space appears and two- fold oxygen atoms increase. By calculating the heat of formation energy, it was found that phase separation between amorphous HfO2 and SiO2 occurs at x> 0.1.

Bionic design of tube formation in the integrated cellular structure

88%

Tanishita K. , Ueda A. , Sudo R. , Ikeda M. , Mitaka T.

2007

tom Vol. 27, no. 1-2

83-87

The individual cells in the reconstructed cellular structures do not necessarily receive sufficient oxygen and necessary substances supply only by diffusion, and it is necessary to install a blood vessel network formation in the cellular structure. In other words, the vessel network formation is essentially required to achieve cellular function, and to develop a technology of reconstruction of the vessel network installed in the three-dimensional cellular architecture is needed. Here the procedure of the tube formation of blood vessels and bile canaliculi (BC) in vitro is focused on, demonstrating a possibility of tube formation in cellular structures reconstructed in vitro. Particularly, attention to the role of biomechanical processes in the tube formation was paid.