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Polymer-Protected and Au-Containing Bi- and Trimetallic Nanoparticles as Novel Catalysts for Glucose Oxidation

Macromolecular Symposia 2012年第1期317-318卷

作者： Naoki Toshima Haijun Zhang Department of Applied Chemistry Tokyo University of Science Yamaguchi SanyoOnoda Yamaguchi 756-0884 Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency (JST) Kawaguchi Saitama 332-0012 Japan

Polymer-protected metal nanoparticles (NPs) are recognized as a type of complex between a polymer and metal NPs, since the metal NPs are stabilized by coordination to the polymer. Thus, they can work as an effective catalyst in a dispersed state due to their high surface area-to-volume ratio and high stability by protection with poly(N-vinyl-2-pyrrolidone) (PVP). In this study, colloidal dispersions of PVP-protected and Au-containing bi- and trimetallic NPs were prepared and applied to the catalyst for the aerobic oxidation of glucose into gluconic acid in an alkaline solution. The AuAg and AuPt bimetallic NPs were more active than the Au NPs although the Ag and Pt NPs were less active than the Au NPs. The AuAgPt (Au/Ag/Pt = 7/2/1) trimetallic NPs were the most active catalyst for the same reaction. The high activity can be explained by electronic charge transfer from the Ag or Pt to the Au.

关键词： Ag Au catalyst bimetallic nanoparticles gluconic acid glucose oxidation Pt trimetallic nanoparticles

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Nanofabrication of polymeric aperture array for localized illumination beyond diffraction limit

Nanofabrication of polymeric aperture array for localized il...

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15th International Conference on Miniaturized Systems for Chemistry and Life sciences 2011, MicroTAS 2011

作者： Ono, Takao Iizuka, Ryo Akagi, Takanori Funatsu, Takashi Ichiki, Takanori Graduate School of Engineering University of Tokyo Japan Japan Society for the Promotion of Science Japan Core Research of Evolutional Science and Technology Japan Science and Technology Agency Japan Graduate School of Pharmaceutical Sciences University of Tokyo Japan

ISBN: (纸本)9781618395955

A novel imaging device with a localized illumination volume beyond the diffraction limit was fabricated by the high-aspect-ratio nanofabrication of a perfluoropolymer. The device had nanoimprinted perfluoropolymer apertures whose diameter and depth were 100 nm and 200 nm, respectively, and was used with a TIRFM. This device is applicable to single-molecule imaging at a high concentration of fluorescent molecules and free from electron leakage and thermal disturbance.

关键词： Nanotechnology

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O036 IL-17-producing gamma-delta T cells are crucial for the development of autoimmune arthritis in IL-1 receptor antagonist-deficient mice

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Cytokine 2012年第3期59卷 514-514页

作者： A. Akitsu H. Ishigame S. Kakuta S. Saijo Y. Iwakura The Institute of Medical Science University of Tokyo Japan Japan Society for the Promotion of Science Japan Core Research for Evolutional Science and Technology Japan Science and Technology Agency Tokyo Japan Division of Laboratory Animal Research Institute for Bio Medical Sciences Tokyo University of Science Chiba Japan

Introduction A high proportion of IL-17-producing gamma-delta T (gd17) cells was detected in joints of Il1rn −/− mice, a model of rheumatoid arthritis, whose development depends on IL-17 and T cells. However, their pathogenic roles are not well understood. Methods We assessed the effect of gdT cell or CD4 + T cell depletion in Il1rn −/− mice using a monoclonal antibodies. Then, we examined the pathogenic activity of gd17 cells by adoptive transfer. Results To clarify the roles of gdT cells and CD4 + T cells in the development of arthritis, gdT cells or CD4 + T cells were depleted in Il1rn −/− miceusing antibodies. The development of disease was suppressed in both cases, suggesting both gdT cells and CD4 + T cells were involved in the pathogenesis. Then, the pathogenic role of gd17 cells in the absence of Th17 cells was examined. We generated mice with gd17 cells, but without Th17 cells, by adoptively transferring Il17 −/− Il1rn −/− -CD4 + T cells into nu/nu mice in which gd17 cells are present. We found that these mice still developed arthritis and that only gdT cells produced IL-17. To corroborate that the development of arthritis in this transfer system is dependent on IL-17, we adoptively transferred Il17 −/− Il1rn −/− -CD4 + T cells into Il17 −/− - nu/nu mice. The development of arthritis was significantly suppressed in Il17 −/− - nu/nu mice transferred with Il17 −/− Il1rn −/− -CD4 + T cells compared with Il17 +/+ - nu/nu mice transferred with Il17 −/− Il1rn −/− -CD4 + T cells, suggesting that extrathymic gd17 cells are also important for the development of arthritis. Interestingly, Il1rn −/− mice on the nu/nu mice background, in which only gd17 cells but not thymus-derived T cells are present, also developed arthritis. Thus, gd17 cells alone can induce arthritis without involvement of CD4 + T cells only in Il1rn −/− background mice in which excess IL-1 signaling is introduced. In contrast, a combination of CD4 + T cells and gd17 cells was required for the devel

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APTCC: Auto Parallelizing Translator From C To CUDA

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Procedia Computer science 2011年 4卷 352-361页

作者： Takehiko Nawata Reiji Suda Department of Computer Science Graduate School of Information Science the University of Tokyo Japan Science and Technology Agancy Core Research for Evolutional Science and Technology

This paper proposes APTCC, Auto Parallelizing Translator from C to CUDA, a translator from C code to CUDA C without any directives. CUDA C is a programming language for general purpose GPU (GPGPU). CUDA C requires us a special programming manner differently from C. Although there are several pieces of research to reduce this diffculty, the result of those researches still compels us to beware of GPU architecture. It is better however that we are able to concentrate on the algorithm. Hence we propose translation of C code into CUDA C optimized to the target GPU architecture without directives, where the complexity of the GPU hardware is transparent to the programmer. In translating a C code to a CUDA C code, two questions have to be answered. The first question is how to select the code fragments which should be translated into CUDA C, and the second question is how to translate the selected code fragments into CUDA C. To the first question, this paper proposes a heuristic selection scheme based on the loop structure of the source code. The current implementation of APTCC selects nested loops for the target of translation. To the second question, APTCC translate all the statements in the body of outermost loop into CUDA C. This paper explains the detailed implementation of APTCC and compares the results of performance comparison of a few experimental input source codes.

关键词： GPGPU CUDA Translation Auto-Parallelization

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One-Step Synthesis of Magnetically Recyclable Au/Co/Fe Triple- Layered core-Shell Nanoparticles as Highly Efficient Catalysts for the Hydrolytic Dehydrogenation of Ammonia Borane

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Nano research 2011年第12期4卷 1233-1241页

作者： Kengo Aranishi Hai-Long Jiang Tomoki Akita Masatake Haruta Qiang Xu National Institute of Advanced Industrial Science and Technology （AIST） Ikeda Osaka 563-8577 Japan Graduate School of Engineering Kobe University Nada Ku Kobe Hyogo 657-8501 Japan Graduate School of Urban Environmental Sciences Tokyo Metropolitan University Minami-Osawa Hachioji Tokyo 192-0397 Japan Core Research for Evolutional Science and Technology （CREST） Japan Science and Technology Agency （JST） Kawaguchi Saitama 332-0012 Japan

Magnetically recyclable Au/Co/Fe core-shell nanoparticles （NPs） have been successfully synthesized via a one-step in situ procedure. Transmission electron microscope （TEM）, energy dispersive X-ray spectroscopic （EDS）, and electron energy-loss spectroscopic （EELS） measurements revealed that the trimetallic Au/Co/Fe NPs have a triple-layered core-shell structure composed of a Au core, a Co-rich inter-layer, and a Fe-rich shell. The Au/Co/Fe core-shell NPs exhibit much higher catalytic activities for hydrolytic dehydrogenation of ammonia borane （NHBBH3, AB） than the monometallic （Au, Co, Fe） or bimetallic （AuCo, AuFe, CoFe） counterparts.

关键词： Triple-layered core-shell nanoparticles heterogeneous catalysis ammonia borane hydrogen generation

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Direct force measurement of protein adsorption on well-defined polymer nanointerfaces

Direct force measurement of protein adsorption on well-defin...

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24th European Conference on Biomaterials, EBS 2011

作者： Ishihara, Kazuhiko Nakanishi, Tomoaki Inoue, Yuuki Department of Materials Engineering University of Tokyo Tokyo 113-8656 Japan Department of Bioengineering University of Tokyo Tokyo 113-8656 Japan Core Research for Evolutional Science and Technology Japan Science and Technology Agency Tokyo 102-0075 Japan

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Crystal Structure of Hexagonal Phases and Its Relation To Icosahedral Quasicrystalline Phase in Zn-Mg-RE (RE = Rare Earth) System

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MRS Online Proceedings Library 2011年第1期553卷 129-134页

作者： Hiroyuki Takakura T. J. Sato A. P. Tsai A. Sato A. Yamamoto Natonal Research Institute for Metals Tsukuba Japan Core Research in Evolutional Science and Technology Japan Science and Technology Corporation Kawaguchi Japan National Institute for Research in Inorganic Materials Tsukuba Japan

A relationship between hexagonal phases in the Zn-Mg-RE (RE=rare earth) system and icosahedral quasicrystalline phase is discussed. There are three hexagonal phases in the vicinity of Zn6Mg3RE1 which are related with a lattice parameters by a ratio 3:5:7 but with approximately the same c parameters. A structural model for the phase with medium a lattice parameter is proposed based on the structures of the other two phases recently determined. We also show a preliminary result of X-ray diffraction study of the Zn-Mg-Ho icosahedral phase.

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Channel-Add Operation of a Device Using Defects in a Two-Dimensional Photonic Crystal Slab

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MRS Online Proceedings Library 2011年第1期722卷 231-235页

作者： Asano, Takashi Noda, Susumu Kiyota, Kazuaki Tanaka, Yoshinori Akahane, Yoshihiro Song, Bonshik Mochizuki, Masamtsu Imada, Masahiro Department of Electronic Science & Engineering Kyoto University Kyoto Japan Core Research for Evolutional Science and Technology (CREST) by Japan Science and Technology Corporation Kyoto Japan

A channel add-filtering function of a device based on defects in a two dimensional photonic crystal slab is investigated in addition to a channel drop-filtering function reported previously. It is considered that photons irradiated to a point defect from free space are trapped by the point defect, are transferred to a line defect waveguide nearby, and are emitted from the waveguide edge. It is shown that the spectrum of the add-filtering function is almost same as that of the drop-filtering function, which demonstrates that photons can be not only dropped-from but also added-to a line-defect waveguide through the resonant trapping by point defects.

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100-GHz single-flux-quantum bit-serial adder based on 10-kA/cn2 niobium process

100-GHz single-flux-quantum bit-serial adder based on 10-kA/...

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作者： Tanaka, Masamitsu Akaike, Hiroyuki Fujimaki, Akira Yamanashi, Yuki Yoshikawa, Nobuyuki Nagasawa, Shuichi Takagi, Kazuyoshi Takagi, Naofumi Nagoya University Nagoya 464-8603 Japan Core Research for Evolutional Science and Technology Japan Science and Technology Agency Japan Yokohama National University Yokohama 240-8501 Japan Superconductivity Research Laboratory ISTEC Tsukuba 305-8501 Japan Kyoto University Kyoto 606-8501 Japan

This paper reports the design and test results of a single-flux-quantum (SFQ) bit-serial adder, which we designed with a target-clock frequency of 100 GHz, to investigate several techniques for producing ultra-high-speed computations using SFQ circuits. The bit-serial adder was designed based on a new cell library developed for the ISTEC Advanced Process, where the critical current density and McCumber-Stewart parameters of Josephson junctions were increased to 10 kA/cm3 and 2.0, respectively, to obtain higher operating frequencies. In addition, we adopted a circuit-design technique based on state transitions excluding a feedback loop in a typical bit-serial adder, and redesigned the NOR gate with the McCumber-Stewart parameter increased to 4.0 to improve performance. As a result, we experimentally obtained a sufficient dc bias margin of ±18% from low frequencies to 60 GHz, and verified the correctness of operations up to 93 GHz. We also demonstrated that the introduction of a higher bias voltage or large inductors in series with bias resistors is effective for achieving faster operation. © 2011 IEEE.

关键词： Timing circuits

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Symbol-rate-variable DQPSK receiver fabricated using CMOS-compatible process

Symbol-rate-variable DQPSK receiver fabricated using CMOS-co...

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17th Microoptics Conference, MOC'11

作者： Suzuki, Keijiro Nguyen, Hong C. Tamanuki, Takemasa Shinobu, Fumihiro Saito, Yuji Sakai, Yuya Baba, Toshihiko Department of Electrical and Computer Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama 240-8501 Japan Core Research for Evolutional Science and Technology Japan Science and Technology Agency 5 Sanbancho Chiyoda-ku Tokyo 102-0075 Japan

ISBN: (纸本)9784863481824

We demonstrate a silicon DQPSK receiver, that is symbol-rate variable, fabricated by using CMOS-compatible process. It consists of Si-wire waveguides, splitters/couplers, heater-controlled Mach-Zehnder attenuators, phase shifters, 90°hybrid including low-loss crossing and balanced Ge photodetectors. In addition, micro-ring-based slow-light device is introduced to demodulate various bit-rate signals. The demodulation was observed at bit-rates of 14.8 - 18.0 Gb/s. © 2011 The Japan Society of Applied Physics.

关键词： Fabrication

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