ようこそGPGPUの世界へ

2008-08-29departmental bulletin pape

合成フッ素マイカ層間に固定化したイミノピリジン鉄錯体による原子移動型ラジカル重合《マイレビュー》

The iminopyridine iron(III) and (II) complexes were immobilized into fluorotetrasilicic mica interlayers through the intercalation of the iminopyridine ligand into the mica interlayers and simultaneous coordination of the ligand to the interlayer metal cations. The prepared catalysts were used for atom- transfer radical polymerization (ATRP) of methyl methacrylate (MMA). The Fe3+-based catalyst did not show a significant activity for the ATRP of MMA, whereas when ATRP was performed using the Fe2+-based catalyst, PMMA (poly(methyl methacrylate)) was obtained. Two peaks were observed in the GPC curve of the produced PMMA. Because polydispersity index was higher than 2, free-radical polymerization occurred simultaneously. To suppress the free-radical polymerization, we varied initiator/catalyst molar ratio. On increasing the molar ratio from 2/1 to 4/1 (favorable conditions for free-radical polymerization), PMMA with higher Mw was obtained. In contrast, by decreasing the molar ratio from 2/1 to 1/1 (favorable conditions for ATRP), PMMA with lower Mw was obtained. Those results clearly indicate that the lower Mw peak in the GPC curve corresponds to PMMA produced by ATRP.textapplication/pdfdepartmental bulletin pape

Studies of CP Violation in B→J/ψK* Decays

journal articl

Solar cells : materials, manufacture and operation / edited by Tom Markvart and Luis Castañer.

Includes bibliographical references (p. [523]-527) and index.book fair 2012xi, 555 p. :The capture and use of solar energy has been growing for many years, but only in recent times have advances in design and manufacture allowed us to see the incorporation of solar energy as a significant player in the renewable energy arena. Solar cells are at the heart of any photovoltaic system and in this book the various types are described and their characteristics reviewed. Going beyond materials, design and function, ‘Solar Cells’ also covers their testing, monitoring and calibration thus providing a comprehensive account of current activity in this important field of research and industry. ‘Solar Cells’ has been abstracted from the recent ‘Practical Handbook of Photovoltaics’ by the same editors (ISBN 185617 3909. 2003: Elsevier) Internationally-respected contributors from industry and academia Abstracted from ‘The Practical Handbook of Photovoltaics' by the same Editors A comprehensive source-book on all aspects of solar cells

ドライプロセスによる高速イオン移動界面の構築と高出力電極への展開

application/pdfリチウム電池の電極反応解析を構造が単純化された薄膜電極を用いて行った。本年度は薄膜がもつ幾何学的因子と電極反応速度の関係を検討することを目的とした研究を行った。膜の厚さを変えて電極反応抵抗値を測定したところ、LiCoO_2においては膜の厚さが増すほど抵抗値が増大する結果となった。一方WO_3においては膜の厚さに依存せず抵抗値は一定であった。LiCoO_2は二次元板状構造を有するが、膜厚に依存せず常に110配向の膜であった。 次に、反応の活性化エネルギーを算出した。LiCoO_2電極の活性化エネルギーは70〜80kJ/molの範囲で推移し、活性化エネルギーに対する電極厚さと充放電深度の影響は観測されなかった。WO_3はLiCoO_2より若干小さい値を示すが、厚さに対する依存性は同様に認められない。活性化エネルギーが同じであることから反応の機構自体は変化がない。この事実は反応抵抗の増大が、機構変化が原因ではないことを示している。そこで以下の2つの可能性を考えた。 1.単純に反応活性点が減少している場合 WO_3のような三次元構造を有する材料の場合、電極は結晶構造的に均一でありインターカレーションは表面のどの点からも起こりうる。一方LiCoO_2は異方性結晶であるから、電子伝導パスがその結晶の向きによって決まる。このため厚みが増すほど電子のパスが選別されてゆき、表面ではいくつかのポイントに電子が集約されている不均一な状況が現れるのではないかと予想される。このような状況においては表面積が小さくなったと同じ効果が現れ、抵抗が大きくなる。 2.反応活性点の数が同じと考えられる場合 電子が有する電気的負の雰囲気が電極表面に現れにくいのがLiCoO_2で、現れやすいのがWO_3とすると、抵抗値の増大を説明できる。今後電子に関する情報を収集することで反応機構の本質を明らかにすることが出来ると考えられる。平成17～19年度科学研究費補助金(基盤研究(B))研究成果報告書津95Impedance analysis of PLD LiNi0.8Co0.2O2 film electrodeElectrochemical performances for preferred oriented PLD thin-film electrodes of LiNi0.8Co2, LiFePO4 and LiMn2O4Impedance study and TEM characterization of a PLD perovskite air electrode17350098research repor

Involvement of I-BAR protein IRSp53 in tumor cell growth via extracellular microvesicle secretion

Cellular protrusions mediated by the membrane-deforming I-BAR domain protein IRSp53 are involved in cell migration, including metastasis. However, the role of IRSp53 in cell proliferation remains unclear. Here, we examined the role of IRSp53 in cell proliferation and found that it acts through secretion. Coculture of gingiva squamous carcinoma Ca9-22 cells and their IRSp53-knockout cells restored proliferation to parental Ca9-22 cell levels, suggesting possible secretion dependent on IRSp53. Notably, the amounts of microvesicle fraction proteins that were secreted into the culture medium were reduced in the IRSp53-knockout cells. The IRSp53-knockout cells exhibited decreased phosphorylation of mitogen-activated protein kinase, suggesting the decrease in the proliferation signals. The phosphorylation was restored by the addition of the microvesicles. In mice xenograft Ca9-22 cells, IRSp53-containing particles were secreted around the xenograft, indicating that IRSp53-dependent secretion occurs in vivo. In a tumor mice model, IRSp53 deficiency elongated lifespan. In some human cancers, the higher levels of IRSp53 mRNA expression was found to be correlated with shorter survival years. Therefore, IRSp53 is involved in tumor progression and secretion for cellular proliferation.journal articl