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Numerical study of Natural Convection of Magnetic Fluids in a Cubic Cavity with a Heat Generating Object Inside by the Lattice Boltzmann Method

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Advances in Applied Mathematics and Mechanics 2010年第1期2卷 76-85页

作者： Xiao-Dong Niu Hiroshi Yamaguchi Xin-Rong Zhang keisuke yoshikawa Energy Conversion Research Center Department of Mechanical EngineeringDoshisha UniversityKyoto 630-0321Japan Department of Energy and Resources Engineering College of EngineeringPeking University100871P.R.China

In this article,natural convection of a magnetic fluid in a cubic cavity with a heat generating object inside and under a uniform magnetic field is simulated by the lattice Boltzmann *** obtained from the present simulations are shown to be agreed well with our experimental measurements,and reveal more of effects of the magnetic field on the flow and heat transfer of the magnetic fluids.

关键词： Magnetic fluids natural convection Lattice Boltzmann method

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In Vivo Estimation of Osteogenesis by Bone Marrow Cells in a Bi-Phasic Scaffold and in Each of Its Components

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Journal of Biomedical Science and Engineering 2016年第11期9卷 501-514页

作者： Masataka yoshikawa Hideyuki Kakigi Ayano Miyamoto Sadaomi Sugimoto keisuke Nakai Hideaki Ikenaga Takeshi Inamoto Hiroshi Maeda Department of Endodontics Osaka Dental University Osaka Japan

A bi-phasic scaffold consisting of a columnar formaldehyde-acetalized polyvinyl alcohol (PVF) sponge and a cylindrical porous hydroxyapatite (HA) with a hollow center was devised. Rat bone marrow cells (rBMCs) were seeded into the sponge placed in the hollow center of the cylindrical porous HA. The bi-phasic scaffold, a cylindrical porous HA and a PVF sponge separated from a bi-phasic scaffold after rBMC seeding, and a PVF sponge without rBMCs as a negative control, were implanted for 6 weeks into rat dorsal subcutaneous tissue. In each construct, bone formation was examined histologically and osteocalcin was measured immunochemically. Bone formation was observed in the bi-phasic scaffold and also in the cylindrical porous HA isolated from the bi-phasic scaffold. A significant difference in the quantity of osteocalcin was observed between the bi-phasic scaffold and the isolated cylindrical porous HA. No bone formation was found in the isolated PVF sponge. The bi-phasic scaffold as an outer layer of the scaffold seemed to inhibit the outflow of rBMCs from the PVF sponge. This type of bi-phasic scaffold may have two specific characteristics: Attachment of cells both in PVF sponge and cylindrical porous HA.

关键词： Bi-Phasic Scaffold Hydroxyapatite Polyvinyl Alcohol Sponge Bone Formation In Vivo

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