M. Tanaka

University of Electro-Communications

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Tomoaki Matsumoto

Hosei University

T. Matsumoto

Osaka Prefecture University

Shunichi Fukuzumi

Ewha Womans University

Kei Ohkubo

Osaka University

Yuki Ogasawara

Meiji Pharmaceutical University

Hideo Kimura

Sanyo-Onoda City University

Norihiro Shibuya

Sanyo-Onoda City University

Keiji Onishi

RIKEN Center for Computational Science

J. Sládek

Institute of Construction and Architecture of the Slovak Academy of Sciences

T. Kuroki

Kindai University

Cooperative Institutions

Osaka University

The University of Tokyo

RIKEN Nishina Center

Shinshu University

Centre National de la Recherche Scientifique

RIKEN

Institut National de Physique Nucléaire et de Physique des Particules

Tohoku University

Tokyo University of Science

Istituto Nazionale di Fisica Nucleare, Sezione di Padova

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Stabilization of DNA duplex by 2-substituted adenine as a minor groove modifier

Bioorganic & Medicinal Chemistry Letters (2011)

M. Tanaka Ryota Kozakai Yoshio Saitō Isao Saito

Duplex (building)

Deoxyadenosine

10.1016/j.bmcl.2011.09.104

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Citations (7)

A boundary element method for elastic buckling analysis of assembled plate structures

Computational Mechanics (1988)

M. Tanaka K. Miyazaki

Biharmonic equation

Algebraic equation

Bending of plates

10.1007/bf00280751

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Citations (10)

Finite element analysis of the substrate thickness effect on traveling leakey surface acoustic waves

IEEE Symposium on Ultrasonics (2004)

S. Yoon Jiun-Der Yu S. Kanna Masahiro Oshio M. Tanaka

A FE method is developed for analysis of travelling LSAWs. Because of the use of the general eigenvalue problem with Hermitian coefficient matrices needs to be solved. A publicly available eigenvalue solver ARPACK, together with the shift and invert spectral transformation, is used to solve the problem efficiently. The effect of the finite thickness of substrates on the dispersion behaviour of LSAWs is simulated.

Solver

10.1109/ultsym.2003.1293237

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Citations (9)

New Insights in Boundary-only and Domain-type RBF Methods

arXiv (Cornell University) (2002)

W. Chen M. Tanaka

This paper has made some significant advances in the boundary-only and domain-type RBF techniques. The proposed boundary knot method (BKM) is different from the standard boundary element method in a number of important aspects. Namely, it is truly meshless, exponential convergence, integration-free (of course, no singular integration), boundary-only for general problems, and leads to symmetric matrix under certain conditions (able to be extended to general cases after further modified). The BKM also avoids the artificial boundary in the method of fundamental solution. An amazing finding is that the BKM can formulate linear modeling equations for nonlinear partial differential systems with linear boundary conditions. This merit makes it circumvent all perplexing issues in the iteration solution of nonlinear equations. On the other hand, by analogy with Green's second identity, we also presents a general solution RBF (GSR) methodology to construct efficient RBFs in the domain-type RBF collocation method and dual reciprocity method. The GSR approach first establishes an explicit relationship between the BEM and RBF itself on the ground of the potential theory. This paper also discusses some essential issues relating to the RBF computing, which include time-space RBFs, direct and indirect RBF schemes, finite RBF method, and the application of multipole and wavelet to the RBF solution of the PDEs.

10.48550/arxiv.cs/0207017

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Citations (6)

Application of boundary-domain element method to the free vibration problem of plate structures

Computers & Structures (1998)

M. Tanaka Tomoaki Matsumoto Akira Shiozaki

Algebraic equation

Solver

10.1016/s0045-7949(97)00129-6

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Citations (7)

DNA Cleavage by UVA Irradiation of NADH with Dioxygen via Radical Chain Processes

The Journal of Physical Chemistry A (2006)

M. Tanaka Kei Ohkubo Shunichi Fukuzumi

Efficient DNA cleaving-activity is observed by UVA irradiation of an O2-saturated aqueous solution of NADH (β-nicotinamide adenine dinucleotide, reduced form). No DNA cleavage has been observed without NADH under otherwise the same experimental conditions. In the presence of NADH, energy transfer from the triplet excited state of NADH (3NADH*) to O2 occurs to produce singlet oxygen (1O2) that is detected by the phosphorescence emission at 1270 nm. No quenching of 1O2 by NADH was observed as indicated by no change in the intensity of phosphorescence emission of 1O2 at 1270 nm in the presence of various concentrations of NADH. In addition to the energy transfer, photoinduced electron transfer from 3NADH* to O2 occurs to produce NADH•+ and O2•-, both of which was observed by ESR. The quantum yield of the photochemical oxidation of NADH with O2 increases linearly with increasing concentration of NADH but decreases with increasing the light intensity absorbed by NADH. Such unusual dependence of the quantum yield on concentration of NADH and the light intensity absorbed by NADH indicates that the photochemical oxidation of NADH with O2 proceeds via radical chain processes. The O2•- produced in the photoinduced electron transfer is in the protonation equilibrium with HO2•, which acts as a chain carrier for the radical chain oxidation of NADH with O2 to produce NAD+ and H2O2, leading to the DNA cleavage.

Quantum yield

10.1021/jp064130r

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Citations (44)

Laser Photophoretic Migration with Periodic Expansion−Contraction Motion of Photo-Absorbing Microemulsion Droplets in Water

Langmuir (2004)

M. Tanaka Hideaki Monjushiro Hitoshi Watarai

When the water-in-oil (w/o) microemulsion droplets including the Co(III)-pyridylazo complex as the photo-absorber were irradiated with a continuous-wave Ar(+) ion laser (514.5 nm), we have observed unexpected phenomenon that photo-absorbing microemulsion droplets in water repeated the expansion and the sudden contraction during the laser photophoretic migration. The period of the expansion-contraction cycle was inversely proportional to both the concentration of the complex and the irradiated laser power and was independent of the initial size of the droplet. The mechanism of the periodic motion of the droplet was investigated by local temperature measurement and Raman microscope spectroscopy. It was suggested that the first step was the phase separation of the bicontinuous microemulsion droplet into the normal w/o microemulsion outer phase and the aqueous inner phase in the droplet, which was caused by the laser-induced temperature gradient inside the droplet. Subsequently, an expansion of the inner aqueous phase was induced by the percolation of the external water by thermo-osmosis, which was caused by the laser-induced temperature gradient between the inside and the outside of the microemulsion liquid membrane of the droplet. When the liquid membrane became thinner to a critical thickness, the inner aqueous phase was released and the droplet shrank into the original size. The proposed mechanism can give an account of the unique cyclical motion.

Microemulsion

Temperature Gradient

10.1021/la0485780

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Citations (20)

π-Complex Formation between Bisporphyrin and Acridinium Ion and the Photodynamics

ECS Transactions (2007)

M. Tanaka Kei Ohkubo Claude P. Gros Roger Guilard S. Fukuzumi

Acridinium ion forms a pai-complex with a free-base bisporphyrin through pai-pai interaction in benzonitrile. Photoinduced electron transfer from a cofacial bisporphyrin to acridinium ion in a pai-complex formed between a cofacial bisporphyrin and acridinium ion results in formation of the persistent electron- transfer state at low temperature.

Benzonitrile

Photoinduced electron transfer

Complex formation

10.1149/1.2408963

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Citations (2)

ELASTOSTATIC ANALYSIS OF SPATIAL FRAME STRUCTURES BY BOUNDARY ELEMENT METHOD

Elsevier eBooks (1990)

M. Tanaka Qing Yang

Direct stiffness method

Bar (unit)

Code (set theory)