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Self-Aggregation of Synthetic Magnesium Bacteriochlorins as a Photosynthetic Antenna Model
Kunieda, Michio,Mizoguchi, Tadashi,Tamiaki, Hitoshi Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
We prepared 3-(1-hydroxyethyl)-bacteriopyrochlorophy11-a (3) possessing magnesium atom and phytyl ester from modification of natural bacteriochlorophyll(BChl)-a. A dichloromethane solution of (3$^1$R) and (3$^1$S)-3 was diluted with 100~1000 fold volume of cyclohexane to give new species absorbing near-infrared lights. The resulting Q, maximum of (3$^1$R)-3 was 860 nm and red-shifted by 2150 $cm^{-1}$ / from the monomeric. In the nonpolar organic solvent, epimeric (3$^1$S)-3 showed a 1ess red-shifted peak at 798 nm as well as a residual monomeric band. Such visible spectra indicated that 3 diastereose1ectively aggregated in cyclohexane to afford oligomers possessing a simi1ar supramolecular structure with chlorosomal aggregates of natural BChl-d, 7,8-dehydro-form of 3.
High Speed Iterated Transformation Theory Based Coding using Wavelet Transformation
Kunieda, Hiroaki,Takeuchi, Yoshinori,Saeki, Masatomo 대한전자공학회 1994 ISPACS:Intelligent Signal Processing and Communica Vol.1 No.1
This paper proposes a new high speed algorithm for Iterated Transformation Theory Based Coding(ITTBC) [1]. ITTBC is one of the efficient coding algorithm which uses the fractal feature of image. However, the ITTBC requires the vast amount of computation of its pattern matching/ searching process. We propose an algorithm which utilizes wavelet transformation to reduce the time required for searching process. The advantage of the proposed algorithm demonstrated by computer simulations.
S. Kunieda,T. Fukahori,S. Hirayama,Y. Watanabe 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Applicability of the pre-equilibrium coalescence model was investigatedtoward the construction of advanced and comprehensive nuclear data. Thisstudy was devoted to the analysis for nucleon-induced alpha-particleproduction cross sections up to 200 MeV. The optical model calculation wasperformed with suitable potential parameters both for incident- andoutgoing- channels. The Iwamoto-Harada-Sato coalescence model wasincorporated into the GNASH code in order to take account the pickupcontribution from the pre-equilibrium stages. It was found that the presentapproach enabled us to reproduce measured cross sections better thanempirical models which had been commonly used for nuclear data evaluations up to ~100 MeV. From comparisons between the modelcalculations and experimental data, we discuss the behaviors of the modelparameters and applicability limit of the present approach.