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Maeda, Chihiro,Kim, Pyosang,Cho, Sung,Park, Jong Kang,Lim, Jong Min,Kim, Dongho,Vura-Weis, Josh,Wasielewski, Michael R.,Shinokubo, Hiroshi,Osuka, Atsuhiro WILEY-VCH Verlag 2010 Chemistry Vol.16 No.17
<P>meso-Triazolyl-appended Zn<SUP>II</SUP>–porphyrins were readily prepared by Cu<SUP>I</SUP>-catalyzed 1,3-dipolar cycloaddition of benzyl azide to meso-ethynylated Zn<SUP>II</SUP>–porphyrin (click chemistry). In noncoordinating CHCl<SUB>3</SUB> solvent, spontaneous assembly occurred to form tetrameric array (3)<SUB>2</SUB> from meso–meso-linked diporphyrins 3, and dodecameric porphyrin squares (4)<SUB>4</SUB> and (5)<SUB>4</SUB> from the L-shaped meso–meso-linked triporphyrins 4 and 5. The structures of these assemblies were examined by <SUP>1</SUP>H NMR spectra, absorption spectra, and their gel permeation chromatography (GPC) retention time. Furthermore, the structures of the dodecameric porphyrin squares (4)<SUB>4</SUB> and (5)<SUB>4</SUB> were probed by small- and wide-angle X-ray scattering (SAXS/WAXS) measurements in solution using a synchrotron source. Excitation-energy migration processes in these assemblies were also investigated in detail by using both steady-state and time-resolved spectroscopic methods, which revealed efficient excited-energy transfer (EET) between the meso–meso-linked Zn<SUP>II</SUP>–porphyrin units that occurred with time constants of 1.5 ps<SUP>−1</SUP> for (3)<SUB>2</SUB> and 8.8 ps<SUP>−1</SUP> for (5)<SUB>4</SUB>.</P> <B>Graphic Abstract</B> <P>Getting it together: In a noncoordinating solvent, spontaneous assembly occurs to form a tetrameric array from meso–meso-linked diporphyrins, and a dodecameric porphyrin square from L-shaped meso–meso-linked triporphyrins (see graphic). Efficient excited-energy transfer (EET) between the meso–meso-linked Zn<SUP>II</SUP>–porphyrin units was revealed. <img src='wiley_img_2010/09476539-2010-16-17-CHEM200903195-content.gif' alt='wiley_img_2010/09476539-2010-16-17-CHEM200903195-content'> </P>
Study of Flow Field and Pressure Distribution on a Rotor Blade of HAWT in Yawed Flow Conditions
Maeda, Takao,Kamada, Yasunari,Okada, Naohiro,Suzuki, Jun Korean Society for Fluid machinery 2010 International journal of fluid machinery and syste Vol.3 No.4
This paper describes the flow field and the blade pressure distribution of a horizontal axis wind turbine in various yawed flow conditions. These measurements were carried out with 2.4m-diameter rotor with pressure sensors and a 2-dimensional laser Doppler velocimeter for each azimuth angle in a wind tunnel. The results show that aerodynamic forces of the blade based on the pressure measurements change according to the local angle of attack during rotation. Therefore the wake of the yawed rotor becomes asymmetric for the rotor axis. Furthermore, the relations between aerodynamic forces and azimuth angles change according to tip speed ratio. By the experimental analysis, the flow field and the aerodynamic forces for each azimuth angle in yawed flow condition were clarified.
The Development of the Totalized Hydrogen Energy Utilization System for Commercial Buildings
Maeda, Tetsuhiko,Nakano, Akihiro,Ito, Hiroshi,Tange, Manabu,Kawakami, Yoshiaki,Kato, Atsushi,Masuda, Masao The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.2
We have proposed the Totalized Hydrogen Energy Utilization System(THEUS) for applying to commercial buildings. THEUS consists of fuel cells, water electrolyzers, metal hydride tanks and their auxiliaries. We evaluated the energy saving of the basic THEUS in view of an actual operation using thermal demand data of actual buildings. The THEUS have ability for achieving energy saving, in comparison with an ice storage system for cooling demand. We have developed the hydrogen storage system using metal hydride and unitized reversible cell (URC) combine the functionality of a fuel cell and an electrolyzer in a single device, these are important components of THEUS. The metal hydride tank designed and manufactured to evaluate that we assumed actual operation in the experiments. We developed the numerical simulation code, and simulation results are in good agreement with experimental data. The simulation about two tanks system was done by using this code. The heat utilization can be improved greatly. To achieve URC commercial use, improvement of durability was examined. It confirmed that our URC had durability for several thousand hours.
Improvement in the Super Low Core-loss Soft Magnetic Materials
Maeda Toru,Sato Atsushi,Mochida Yasushi,Toyoda Haruhisa,Mimura Koji,Nishioka Takao 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
We reported a P/M soft magnetic material with core loss value of , which is lower than that of 0.35mm-thick laminated material, by using high purity gas-atomized iron powder. Lack of mechanical strength and high cost of powder production are significant issues for industrial use. In order to achieve both low core loss and high strength by using inexpencive powder, the improvement of powder shape and surface morphology and binder strength was conducted. As the result, the material based on water-atomized powder with 80 MPa of TRS and 108 W/kg of core loss (W10/1k) was achieved.