Ariake National College of Technology
Omuta, Japan
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Mishima M.,Ariake National College of Technology | Suganuma A.,Japan Institute for Environmental Sciences
2016 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2016 | Year: 2016

The billiard is necessary to acquire proper stance. If the player hit the ball in irregular stance, he or she would occur that mishits or the ball does not roll to the aimed place. Learning and using proper stance is the most critical aspect of a person's early billiard career. Thereby, we have been developing stance correction system. When the rear elbow is a right angle or the forward arm stretches, that stance is correct. Therefore, this system captures the player using the Kinect, and compares the angle of rear elbow and forward shoulder with thresholds. Using this system, the beginner can enjoy if he or she participates in the game. © 2016 IEEE.

Nishimura T.,University of Kitakyushu | Sanada Y.,University of Kitakyushu | Matsuo T.,University of Kitakyushu | Okobira T.,Ariake National College of Technology | And 3 more authors.
Chemical Communications | Year: 2013

An amphiphilic macrocycle based on pillar[5]arene with polar lysine head groups spontaneously self-assembles into a bimolecular micelle in water. This self-assembled structure was characterized by small angle X-ray scattering (SAXS), field flow fluctuation coupled with multi-angle light scattering (FFF-MALS) and atomic force microscopy (AFM). The self-assembly of amphiphilic pillar[5]arene into dimeric spherical micelles represents a new molecular architecture for micelle formation. This journal is © The Royal Society of Chemistry.

Iwashita T.,Ariake National College of Technology | Azuma K.,Sojo University
Journal of Structural Engineering (United States) | Year: 2012

Over the past two decades, plastic constraint effects have been an issue of concern in both fracture mechanics and structural integrity research, and several methods have been proposed for considering loss of plastic constraint. This paper shows the ability of a simplified model to predict brittle fracture under low plastic constraint conditions. Fracture toughness tests are performed on single-edge notched bend (SENB) steel specimens with deep and shallow notches, as well as on double-edge notched tension and center-notched tension (CNT) specimens. When compared with SENB specimens with a deep notch, the CNT specimens show high fracture toughness as a result of the loss of plastic constraint at the crack tip. Here, the Weibull stress approach and a toughness scaling model (TSM) are used to consider the effects of the loss of plastic constraint on the fracture toughness of the specimens. The corrected fracture toughness values evaluated by the TSM are found to be close to the toughness values observed in the tests and to the values predicted by the Weibull stress approach. This paper also briefly discusses the effect of ductile crack growth on brittle fracture. © 2012 American Society of Civil Engineers.

Yamamoto M.,Tokyo University of Science | Liu D.,Ariake National College of Technology
Journal of Material Cycles and Waste Management | Year: 2013

Coastal areas in Japan and other parts of the world have serious problems with barren grounds. A method has been developed that uses a mixture of steelmaking slag and compost including humic substances supplied in seawater, for restoring seaweed beds. The effects of this method have been previously confirmed in field tests. It was found that the mixture of steelmaking slag and compost was effective for extending the lifetime of iron elution as well as increasing iron concentrations in seawater. In this study, the effect of the mixing composts with steelmaking slag was evaluated additionally for increasing dissolved iron concentrations in seawater. The characteristics of iron elution were also studied using this method. In particular, the mechanism of Fe elution and dissolved Fe oxidation was examined in detail. The iron elution of actual seawaters was tested using three kinds of samples which involved steelmaking slag, compost, and a mixture of steelmaking slag and compost. These samples were used to understand the mechanism of Fe elution and oxidation in seawater. It was found that the mixture of steelmaking slag and compost was the most effective, which also confirmed the validity of the proposed Fe elution process in seawater. © 2013 Springer Japan.

Niedzwiedzki D.M.,Washington University in St. Louis | Kobayashi M.,Ariake National College of Technology | Blankenship R.E.,Washington University in St. Louis
Photosynthesis Research | Year: 2011

Light-harvesting complex 2 from the anoxygenic phototrophic purple bacterium Thermochromatium tepidum was purified and studied by steady-state absorption, fluorescence and flash photolysis spectroscopy. Steady-state absorption and fluorescence measurements show that carotenoids play a negligible role as supportive energy donors and transfer excitation to bacteriochlorophyll-a with low energy transfer efficiency of ∼ 30%. HPLC analysis determined that the dominant carotenoids in the complex are rhodopin and spirilloxanthin. Carotenoid excited triplet state formation upon direct (carotenoid) or indirect (bacteriochlorophyll-a Qx band) excitation shows that carotenoid triplets are mostly localized on spirilloxanthin. In addition, no triplet excitation transfer between carotenoids was observed. Such specific carotenoid composition and spectroscopic results strongly suggest that this organism optimized carotenoid composition in the light-harvesting complex 2 in order to maximize photoprotective capabilities of carotenoids but subsequently drastically suppressed their supporting role in light-harvesting process. © Springer Science+Business Media B.V. 2011.

Okuzono T.,Oita University | Otsuru T.,Oita University | Tomiku R.,Oita University | Okamoto N.,Ariake National College of Technology
Applied Acoustics | Year: 2014

This paper presents a finite element method (FEM) using hexahedral 27-node spline acoustic elements (Spl27) with low numerical dispersion for room acoustics simulation in both the frequency and time domains, especially at higher frequencies. Dispersion error analysis in one dimension is performed to increase the accuracy of FEM using Spl27 by modifying the numerical integration points of element stiffness and mass matrices. The basic accuracy and efficiency of the FEM using the improved Spl27, which uses modified integration points, are presented through numerical experiments using benchmark problems in both the frequency and time domains, revealing that FEM using the improved Spl27 in both domains provides more accurate results than the conventional method does, and with fewer degrees of freedom. Moreover, the effectiveness of FEM using the improved Spl27 over that using hexahedral 27-node Lagrange elements is shown for time domain analysis of the sound field in a practical sized room. © 2013 Elsevier Ltd. All rights reserved.

Katsura H.,Gakushuin University | Tanaka A.,Ariake National College of Technology
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

We present an extension of Nagaoka's theorem in the SU(n) generalization of the infinite-U Hubbard model. It is shown that, when there is exactly one hole, the fully polarized states analogous to the ferromagnetic states in the SU(2) Hubbard model are ground states. For a restricted class of models satisfying the connectivity condition, these fully polarized states are the unique ground states up to the trivial degeneracy due to the SU(n) symmetry. We also give examples of lattices in which the connectivity condition can be verified explicitly. The examples include the triangular, Kagomé, and hypercubic lattices in d(≥2) dimensions, among which the cases of d=2 and 3 are experimentally realizable in ultracold atomic gases loaded into optical lattices. © 2013 American Physical Society.

Okuzono T.,Oita University | Otsuru T.,Oita University | Tomiku R.,Oita University | Okamoto N.,Ariake National College of Technology
Journal of the Acoustical Society of America | Year: 2012

The applicability of the modified integration rule for time-domain finite-element analysis is tested in sound field analysis of rooms involving rectangular elements, distorted elements, and finite impedance boundary conditions. Dispersion error analysis in three dimensions is conducted to evaluate the dispersion error in time-domain finite-element analysis using eight-node hexahedral elements. The results of analysis confirmed that fourth-order accuracy with respect to dispersion error is obtainable using the Fox-Goodwin method (FG) with a modified integration rule, even for rectangular elements. The stability condition in three-dimensional analysis using the modified integration rule is also presented. Numerical experiments demonstrate that FG with a modified integration rule performs much better than FG with the conventional integration rule for problems with rectangular elements, distorted elements, and with finite impedance boundary conditions. Further, as another advantage, numerical results revealed that the use of modified integration rule engenders faster convergence of the iterative solver than a conventional rule for problems with the same degrees of freedom. © 2012 Acoustical Society of America.

Iwashita T.,Ariake National College of Technology | Iwashita T.,University of Toronto | Packer J.A.,University of Toronto | Oliveira J.-C.D.,Cast Connex Corporation
Journal of Structural Engineering (United States) | Year: 2012

During the last decade, various steel casting products for steel building structures have been developed, such as connectors between brace members and gusset plates in braced frames. Some casting products are welded to steel sections such as tubular members and I-section members in building structures, where these members are expected to develop their capacity during a large-scale earthquake. In this situation, brittle fracture can be another concern of the casting products if there are defects in the connections. A study of defect tolerance for cast steel connections is therefore very important to prevent brittle fracture from weld defects or casting defects. This paper describes defect tolerances for cast steel connections in braced frames and explores the possibility of brittle fracture from assumed defects in typical cast steel connectors. A parametric study, which investigates the sensitivity of brittle fracture to defect size, defect location, and material mismatch effects, is described through cast steel connector models. A toughness scaling model is used for evaluating the occurrence of brittle fracture from assumed defects in the models. © 2012 American Society of Civil Engineers.

Tateiba M.,Ariake National College of Technology
IEICE Transactions on Electronics | Year: 2010

The theoretical studies conducted mainly by the author are reviewed on (1) derivation of arbitrary order moment equations and solutions of some equations, (2) scattering by many particles and the effective medium constant of random medium, (3) scattering by a conducting body in random media and (4) spatially partially-coherent wave scattering, with application to satellite communications, artificial material development, and sensing and radar technology. The leading research results are described with many references; and also unsolved subjects in the above four studies are touched. Copyright © 2010 The Institute of Electronics, Information and Communication Engineers.

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