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T. Hyakutake,Y. Akagi,,T. Imaru,T. Matsumto,S. Yanase 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.11
Flow analysis at microvascular bifurcation after partial replacement of red blood cell (RBC) with liposome-encapsulated hemoglobin (LEH) was performed. A two-dimensional bifurcation model with a parent vessel and two daughter branches was considered. Here, we adopted the lattice Boltzmann method(LBM) for the computation of blood flow. Moreover, the immersed boundary method was employed to incorporate the fluid-membrane interaction between the flow field and deformable RBCs. The cell membrane is treated as a neo-Hookean viscoelastic material. A Morse potential was adopted to model the intercorpuscular interaction. When the half of RBCs was replaced by isovolumic LEH particles, the biasing of RBC flow was enhanced. However, LEH particles flowed favorable into the lower-flow branch because many LEH particles within the parent vessel were suspended in the plasma layer that is impenetrable to RBCs. The biasing of the RBC flux was enhanced when the RBC aggregation was taken into account in the model. It was clarified that the RBC aggregation-induced change of the plasma layer thickness has a marked influence on the fractional LEH flux at the microvascular bifurcation.
A geometric look on the microstates of supertubes
Bak, Dongsu,Hyakutake, Yoshifumi,Kim, Seok,Ohta, Nobuyoshi Elsevier 2005 Nuclear physics, B Vol.712 No.1
<P><B>Abstract</B></P><P>We give a geometric interpretation of the entropy of the supertubes with fixed conserved charges and angular momenta in two different approaches using the DBI action and the supermembrane theory. By counting the geometrically allowed microstates, it is shown that both the methods give consistent result on the entropy. In doing so, we make the connection to the gravity microstates clear.</P>
Hachikubo, Akihiro,Yamada, Koutarou,Miura, Taku,Hyakutake, Kinji,Abe, Kiyoshi,Shoji, Hitoshi Korea Institute of Ocean ScienceTechnology 2004 Ocean and Polar Research Vol.26 No.3
The processes of formation and dissociation of gas hydrates were investigated by monitoring pressure and temperature variations in a pressure cell in order to understand the kinetic behavior of gas hydrate and the controlling factors fur the phase transition of gas hydrate below freezing. Gas hydrates were made kom guest gases ($CH_4,\;CO_2$, and their mixed-gas) and fine ice powder. We found that formation and dissociation speeds of gas hydrates were not controlled by temperature and pressure conditions alone. The results of this study suggested that pressure levels at the formation of mixed-gas hydrate determine the transient equilibrium pressure itself.
Akihiro Hachikubo,Koutarou Yamada,Taku Miura,Kinji Hyakutake,Kiyoshi Abe,Hitoshi Shoji 한국해양과학기술원 2004 Ocean and Polar Research Vol.26 No.3
The processes of formation and dissociation of gas hydrates were investigated by monitoring pressure and temperature variations in a pressure cell in order to understand the kinetic behavior of gas hydrate and the controlling factors for the phase transition of gas hydrate below freezing. Gas hydrates were made from guest gases (CH4, CO2 and their mixed-gas) and fine ice powder. We found that formation and dissociation speeds of gas hydrates were not controlled by temperature and pressure conditions alone. The results of this study suggested that pressure levels at the formation of mixed-gas hydrate determine the transient equilibrium pressure itself.