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Yutaka Maeda,Taku Hiramatsu,Seiji Miyoshi,Hiroomi Hikawa 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this work, we propose a learning scheme of pulse coupled oscillator using one-measurement simultaneous perturbation optimization method. Moreover, hardware implementation, especially, implementation by field programmable analog array is considered. Design result and actual operation results are described.
C60(OH)n-ASSISTED DISPERSION OF SINGLE-WALLED CARBON NANOTUBES
YUTAKA MAEDA,TAKAAKI KATO,JUNKI HIGO,TADASHI HASEGAWA,TAKAHIRO KITANO,TAKAHIRO TSUCHIYA,TAKESHI AKASAKA,TOSHIYA OKAZAKI,JING LU,SHIGERU NAGASE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2008 NANO Vol.3 No.6
We demonstrate that C60(OH)n-assists the dispersion of SWNTs in aqueous and nonaqueous solutions, which effectively exfoliates large-diameter SWNTs. The SWNT dispersions are characterized by absorption and photoluminescence spectra.
Maeda, Yutaka,Higo, Junki,Amagai, Yuri,Matsui, Jun,Ohkubo, Kei,Yoshigoe, Yusuke,Hashimoto, Masahiro,Eguchi, Kazuhiro,Yamada, Michio,Hasegawa, Tadashi,Sato, Yoshinori,Zhou, Jing,Lu, Jing,Miyashita, Tok American Chemical Society 2013 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.135 No.16
<P>This report describes a helicity-selective photoreaction of single-walled carbon nanotubes (SWNTs) with disulfide in the presence of oxygen. The SWNTs were characterized using absorption, photoluminescence (PL), Raman, and X-ray photoelectron spectroscopy, scanning electron microscopy, and current–voltage (<I>I</I>–<I>V</I>) measurements. Results showed remarkable helicity-selective (metallic SWNTs/semiconducting SWNTs and diameter) functionalization of SWNTs. The reaction rate decreases in the order of metallic SWNTs > semiconducting SWNTs and small-diameter SWNTs > large-diameter SWNTs. Control experiments conducted under various experimental conditions and ESR and femtosecond laser flash photolysis measurements revealed that the helicity-selective reaction proceeds via a photoinduced electron transfer reaction. The PL and <I>I</I>–<I>V</I> measurements showed that the photoreaction is effective not only to control SWNT conductivity but also for the band gap modulation of semiconducting SWNTs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2013/jacsat.2013.135.issue-16/ja402199n/production/images/medium/ja-2013-02199n_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja402199n'>ACS Electronic Supporting Info</A></P>
INTERACTION OF SINGLE-WALLED CARBON NANOTUBES WITH AMINE
YUTAKA MAEDA,MICHIO YAMADA,TADASHI HASEGAWA,TAKESHI AKASAKA,JING LU,SHIGERU NAGASE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.1
Single-walled carbon nanotubes (SWNTs) have excellent mechanical and electrical properties that have led to the proposal of many potential applications. However, SWNTs are typically grown as bundles of metallic and semiconducting tubes. This prevents their widespread application. Therefore, it is technologically critical to disperse and purify SWNTs and separate metallic and semiconducting SWNTs effectively. Recent progress and advances have been made on dispersion, separation, assemble, and control of electronic property of SWNTs by the interaction of organic molecules. This paper presents a brief review of the interaction of SWNTs with amine.
Logic Operations of Chemically Assembled Single-Electron Transistor
Maeda, Kosuke,Okabayashi, Norio,Kano, Shinya,Takeshita, Shuhei,Tanaka, Daisuke,Sakamoto, Masanori,Teranishi, Toshiharu,Majima, Yutaka American Chemical Society 2012 ACS NANO Vol.6 No.3
<P>Double-gate single-electron transistors (SETs) were fabricated by chemical assembling using electroless gold-plated nanogap electrodes and chemisorbed chemically synthesized gold nanoparticles. The fabricated SET showed periodic and stable Coulomb oscillations under application of voltages of both gates. The sole SET also exhibited all two-input logic operations?XOR, XNOR, NAND, OR, NOR, and AND?with an on/off ratio of 10<SUP>2</SUP>. This demonstrates the potential of chemical assembling to give highly stable SETs exhibiting all logic operations.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-3/nn3003086/production/images/medium/nn-2012-003086_0006.gif'></P>
The Effect of L-Ornithine on the Phosphorylation of mTORC1 Downstream Targets in Rat Liver
Kokubo, Takeshi,Maeda, Shyuichi,Tazumi, Kyoko,Nozawa, Hajime,Miura, Yutaka,Kirisako, Takayoshi The Korean Society of Food Science and Nutrition 2015 Preventive Nutrition and Food Science Vol.20 No.4
A non-protein amino acid, L-ornithine (Orn), has been shown to stimulate the urea cycle and tissue protein synthesis in the liver. The purpose of the current study was to assess whether Orn affects the mammalian target of rapamycin (mTOR) complex 1 (mTORC1) pathway, which is involved in protein synthesis. Primary cultured cells isolated from Wistar rat liver were incubated in an amino acid-free medium, followed by addition of Orn for 3 h. The cell lysate was subjected to immunoblotting to evaluate the phosphorylation of downstream targets of mTORC1, including p70S6K, S6, and 4EBP1. To assess the involvement of mTORC1 for the effect of Orn, the cells were pretreated with the mTOR inhibitor rapamycin before the addition of Orn and the cell lysate was subjected to immunoblotting. We next examined whether the effects of Orn were exerted in vivo. Orn was orally administered to 18 h food-deprived rats, the blood and the livers were collected at 1 and 3 h after administration for immunoblotting. Orn treatment for primary cultured cells for 3 h enhanced the phosphorylation of p70S6K, S6, and 4EBP1. In addition, rapamycin blocked the effects of Orn completely (p70S6K and S6) or partially (4EBP1). The oral administration of Orn to the rat also augmented the phosphorylation of mTORC1 downstream targets notably in S6 at 1 h. Our findings demonstrate that Orn has the potential to induce the phosphorylation of downstream targets of mTORC1 in the rat liver. This may be mediated by the augmentation of mTORC1 activity.
Katsuda, Satoru,Maeda, Keiichi,Ohira, Yutaka,Yatsu, Yoichi,Mori, Koji,Aoki, Wako,Morihana, Kumiko,Raymond, John C.,Ghavamian, Parviz,Lee, Jae-Joon,Shimoda, Jiro,Yamazaki, Ryo American Astronomical Society 2016 ASTROPHYSICAL JOURNAL LETTERS - Vol.819 No.2
<P>We present high-resolution long-slit spectroscopy of a Balmer-dominated shock in the northeastern limb of the Cygnus Loop with the Subaru high dispersion spectrograph. By setting the slit angle along the shock normal, we investigate variations of the flux and profile of the H alpha line from preshock to postshock regions with a spatial resolution of similar to 4 x 10(15) cm. The Ha line profile can be represented by a narrow (28.9 +/- 0.7 km s(-1)) Gaussian in a diffuse region ahead of the shock, i.e., a photoionization precursor, and narrow (33.1 +/- 0.2 km s(-1)) plus broad (130-230 km s(-1)) Gaussians at the shock itself. We find that the width of the narrow component abruptly increases up to 33.1 +/- 0.2 km s(-1), or 38.8 +/- 0.4 km s(-1) if we eliminate projected emission originating from the photoionization precursor, in an unresolved thin layer (less than or similar to 4 x 10(15) cm at a distance of 540 pc) at the shock. We show that the sudden broadening can be best explained by heating via damping of Alfven waves in a thin cosmic-ray (CR) precursor, although other possibilities are not fully ruled out. The thickness of the CR precursor in the Cygnus Loop (a soft gamma-ray emitter) is an order of magnitude thinner than that in Tycho's Knot g (a hard gamma-ray emitter), which may be caused by the different energy distribution of accelerated particles between the two sources. In this context, systematic studies might reveal a positive correlation between the thickness of the CR precursor and the hardness of the CR energy distribution.</P>
TADASHI HASEGAWA,TAKESHI AKASAKA,YUTAKA MAEDA,MASAHIRO HASHIMOTO,MAKOTO KANDA,TAKAHIRO TSUCHIYA,TAKATSUGU WAKAHARA,YUHEI MIYAUCHI,SHIGEO MARUYAMA,JING LU,SHIGERU NAGASE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2007 NANO Vol.2 No.4
Single-walled carbon nanotubes (SWNTs) synthesized by catalytic decomposition of an alcohol were purified by extraction. The purified SWNTs were characterized on the basis of visible-near infrared (vis-NIR) absorption, photoluminescence and Raman spectroscopic analyses, scanning electron microscopy (SEM) observation, and thermal analysis. Selective extraction of metallic nanotubes was also achieved by the extraction condition.