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Reproducing kernel based evaluation of incompatibility tensor in field theory of plasticity
Aoyagi, Y.,Hasebe, T.,Guan, P.C.,Chen, J.S. Techno-Press 2008 Interaction and multiscale mechanics Vol.1 No.4
This paper employs the reproducing kernel (RK) approximation for evaluation of field theory-based incompatibility tensor in a polycrystalline plasticity simulation. The modulation patterns, which is interpreted as mimicking geometrical-type dislocation substructures, are obtained based on the proposed method. Comparisons are made using FEM and RK based approximation methods among different support sizes and other evaluation conditions of the strain gradients. It is demonstrated that the evolution of the modulation patterns needs to be accurately calculated at each time step to yield a correct physical interpretation. The effect of the higher order strain derivative processing zone on the predicted modulation patterns is also discussed.
Aoyagi, Yasuyuki,Kuroda, Masayuki,Asada, Sakiyo,Bujo, Hideaki,Tanaka, Shigeaki,Konno, Shunichi,Tanio, Masami,Ishii, Itsuko,Aso, Masayuki,Saito, Yasushi Korean Society for Biochemistry and Molecular Bion 2011 Experimental and molecular medicine Vol.43 No.3
The development of clinically applicable scaffolds is important for the application of cell transplantation in various human diseases. The aims of this study are to evaluate fibrin glue in a novel protein replacement therapy using proliferative adipocytes and to develop a mouse model system to monitor the delivery of the transgene product into the blood and the fate of the transduced cells after transplantation. Proliferative adipocytes from mouse adipose tissue were transduced by a retroviral vector harboring the human lecithin- cholesterol acyltransferase ($lcat$) gene, and were subcutaneously transplanted into mice combined with fibrin glue. The $lcat$ gene transduction efficiency and the subsequent secretion of the product in mouse adipocytes were enhanced using a protamine concentration of $500{\mu}g/ml$. Adipogenesis induction did not significantly affect the $lcat$ gene-transduced cell survival after transplantation. Immunohistochemistry showed the ectopic enzyme production to persist for 28 days in the subcutaneously transplanted genetransduced adipocytes. The increased viability of transplanted cells with fibrin glue was accompanied with the decrease in apoptotic cell death. The immunodetectable serum LCAT levels in mice implanted with the fibrin glue were comparable with those observed in mice implanted with Matrigel, indicating that the transplanted $lcat$ gene-transduced adipocytes survived and functioned in the transplanted spaces with fibrin glue as well as with Matrigel for 28 days. Thus, this $in$ $vivo$ system using fibrin is expected to serve as a good model to further improve the transplanted cell/scaffold conditions for the stable and durable cell-based replacement of defective proteins in patients with LCAT deficiency.
Mapping Distribution of Dipterocarpus in East Kalimantan, Indonesia
Aoyagi, Kota,Tsuyuki, Satoshi,Phua, Mui-How,Teo, Stephen Institute of Forest Science 2012 Journal of Forest Science Vol.28 No.3
Dipterocarps (Dipterocarpaceae) is a dominant tree family of tropical rainforest in Southeast Asia. Dipterocarps have been exploited for its timber and disappearing fast in East Kalimantan. In this study, we predicted the distribution of dipterocarpus, one of the main dipterocarps genera, by evaluating its habitat suitability using logistic regression analysis with specimen collection points and environmental factors from GIS data. Current distribution of dipterocarpus was generated by combining the habitat suitability classes with an updated forest cover map. Rainfall, soil type, followed by elevation was the main factors that influence the distribution of dipterocarpus in East Kalimantan. Dipterocarpus can be found in a quarter of the current forest cover, which is highly suitable as habitat of Dipterocarpus.
Growth Mechanisms for Atypical Forms of Silicon Nanowires
Minoru Aoyagi,Takefumi Hiraguri,Takahiro Ueno,Makoto Okuda,Yuuta Hishinuma 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.1
An investigation was carried out into the growth mechanisms for atypical forms of silicon nanowires (Si-NWs) synthesized using a vapor-liquid-solid growth process assisted by hydrogen radicals. Sn or Au nanoparticles, which act as catalysts during Si-NW growth, were produced by hydrogen radical treatment of Sn or Au thin films covering a silicon substrate. The Si-NWs were synthesized from silane gas excited by hydrogen radicals in the presence of these nanoparticle catalysts. In addition to normal Si-NW structures, atypical forms such as tapered, branched, bent, corrugated and block types, were synthesized. The growth of tapered, branched and bent-type Si-NWs was caused by contraction of the catalytic nanoparticles, adhesion of nanoparticles to the side wall of growing Si-NWs, and non-uniform supersaturation of the nanoparticles with Si, respectively. Growth of corrugated- and block-type Si-NWs was induced by an excess supply of Si atoms to the growing Si-NWs.