Okayama, Japan

Tsuyama National College of Technology is a college of technology in Tsuyama, Okayama, Japan. The college was founded in 1963. Wikipedia.


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Yamaguchi D.,Tsuyama National College of Technology | Furukawa K.,Motoyama Gokin Seisakusyo Co. | Takasuga M.,Motoyama Gokin Seisakusyo Co. | Watanabe K.,Tsuyama National College of Technology
Scientific Reports | Year: 2014

Here we present the first report of a carbon-γ-Fe2O 3 nanoparticle composite of mesoporous carbon, bearing COOH- and phenolic OH-functional groups on its surface, a remarkable and magnetically separable adsorbent, for the radioactive material emitted by the Fukushima Daiichi nuclear power plant accident. Contaminated water and soil at a level of 1,739 Bq kg-1 (134Cs and 137Cs at 509 Bq kg-1 and 1,230 Bq kg-1, respectively) and 114,000 Bq kg-1 (134Cs and 137Cs at 38,700 Bq kg -1 and 75,300 Bq kg-1, respectively) were decontaminated by 99% and 90% respectively with just one treatment carried out in Nihonmatsu city in Fukushima. Since this material is remarkably high performance, magnetically separable, and a readily applicable technology, it would reduce the environmental impact of the Fukushima accident if it were used.


Hasegawa K.,Muroran Institute of Technology | Shimada T.,Tsuyama National College of Technology
Japanese Journal of Applied Physics | Year: 2012

A staggered grid for velocity-stress formulation is presented for modeling elastic waves in anisotropic solids by the finite-difference time domain method. To simply impose boundary conditions on numerical models, our grid is derived by applying a finite integration technique to a single control volume satisfying Newton's law instead of interleaved control volumes for conventional staggered grids. Computed results for the numerical dispersions of the new grid for propagating vertically polarized shear and longitudinal waves in an isotropic solid show that the numerical dispersions of the new grid can be suppressed to the same levels as those of the conventional staggered grids by using a third-degree bipolynomial interpolation. © 2012 The Japan Society of Applied Physics.


Abe T.,Tsuyama National College of Technology
Key Engineering Materials | Year: 2015

The r-value is defined as the ratio of the width strain to the thickness strain under uniaxial tensile loading. The r-value can be defined for each grain in polycrystalline metal during plastic deformation. It was pointed out that r-value of a grain affects the surface roughening of polycrystalline metal, and hence also affects the formability of thin sheet metal. On the other hand, it was shown that by using a rate-type constitutive relation for crystal slips the effect of the number of active slip systems on the yield curves is clarified. In the present paper, the relation between r-value of a grain and its operating slip systems in polycrystalline metals is studied. © (2015) Trans Tech Publications, Switzerland.


Arimoto S.,Tsuyama National College of Technology
Journal of Mathematical Chemistry | Year: 2011

Fukui's DNA problem is a long-range target of the First and Second Generation Fukui Project, whose underlying motive has been to cultivate a new interdisciplinary region between chemistry and mathematics. The normed repeat space Xr(q, d, p) and its super space XB(q, d, p) are special Banach algebras which are fundamental in the second generation Fukui project. In the present article, keeping Fukui's DNA problem in mind, we formulate and solve a prototypal problem (problem I) of the normed repeat space Xr(q, d, p) and its super space XB(q, d, p). The present article provides also three "Challenging Problems" II-IV. These are called parallel problems in view of the structural parallelism observed when compared with the original problem I. The challenging problems, which would allow multiple approaches, are specially designed for those who are interested in interdisciplinary investigations. © 2010 Springer Science+Business Media, LLC.


Abe T.,Tsuyama National College of Technology
aEngineering Plasticity and Its Applications - Proceedings of the 10th Asia-Pacific Conference, AEPA 2010 | Year: 2011

The r?value (Lankford value) is well known as a measure of formability in the industrial sheet metal forming process. The r-value is defined as the ratio of the width strain to the thickness strain under the uniaxial tensile test of the sheet metal. It is possible to define the r-value for each grain of polycrystalline metal during plastic deformation. It is also known that the free surface of polycrystalline metal roughens during plastic deformation owing to irregular deformation of grains in it. In the present paper, a simple model of plastic deformation of polycrystalline metal is proposed. Various features of the surface roughening are well explained with the present model.


Ono T.,Tsuyama National College of Technology
Transactions of the North American Manufacturing Research Institution of SME | Year: 2010

Wear characteristics of small ball end mills in the micro milling process on optical glass are discussed. A method to measure loss of cutting edge is developed to observe the wear characteristics of glass milling. This method allows the loss of cutting edge to be determined from the surface profile of a machined surface with a numerical approach. Cutting tests are performed by changing of the attitude of the tool cutting edge and typical cutting conditions to verify the validity of the developed method and to observe the wear characteristics in glass milling. In this experiment, the loss of cutting edge is changed by tool attitude because the cutter velocity of actual cutting area is changed by tool attitude. On the other hand, the loss of cutting edge is not changed with the rotational speed and feed rate of the milling tool in which a crack-free surface can be obtained. In addition, diamond-coated carbide tools show high durability. However, they leave small brittle cracks on the machined surface. It is concluded that the flank wear does not grow enough to suppress the brittle crack because of the hardness of the diamond coat.


Abe T.,Tsuyama National College of Technology
International Journal of Mechanical Sciences | Year: 2014

The r-value is defined as the ratio of the width strain to the thickness strain. It was pointed out that the r-value can be defined for each grain in polycrystalline metal during plastic deformation. Based on r-value of grains, a model of plastic deformation of polycrystalline metal and surface roughening after plastic deformation is proposed in the present paper. Various experimental features of the surface roughening under uniaxial stress are well explained with the present first model. Meanwhile, the r-value is also known as a measure of formability in the sheet metal forming process. Marciniak and Kuczynski proposed the so-called M-K model which gives the analytical estimation of the formability of sheet metal under biaxial stretching considering a certain irregularity of the thickness of the sheet metal. Yamaguchi et al. showed that the experimentally measured surface roughness may correspond to the surface irregularity suggested in the M-K model. In the present paper, the formability of sheet metal under biaxial stretching is analyzed based on the surface roughening model caused by the difference of the r-value in sheet metals. © 2014 Elsevier Ltd. All rights reserved.


Arimoto S.,Tsuyama National College of Technology
Journal of Mathematical Chemistry | Year: 2010

The present article is a direct continuation of the second part of this series. In conjunction with the analysis of the energy band curves of carbon nanotubes, we develop here fundamental theoretical tools, which are essential to prove the Local Analyticity Proposition (LAP). The LAP enables one to prove the Fukui conjecture (the guiding conjecture for developing the repeat space theory) in a new and powerful context of the theory of algebraic curves and resolution of singularities. The present fundamental tools also serve as modular tools for the repeat space theory, by which one can solve a variety of additivity and molecular network problems in a unifying manner. © 2009 Springer Science+Business Media, LLC.


Fujita K.,Tsuyama National College of Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2010

Spike timing dependent synaptic plasticity (STDP) is found in various areas of the brain, visual cortex, hippocampus and hindbrain of electric fish, etc. The synaptic modification by STDP depends on time difference between pre- and postsynaptic firing time. If presynaptic neuron fires earlier than postsynaptic neuron dose, synaptic weight is strengthened. If postsynaptic neuron fires earlier than presynaptic neuron dose, synaptic weight is weakened. This learning rule is one example of various rules (hippocampal type). The learning rule of electric fish type is reversed to the rule of hippocampal type. Changes of synaptic efficiency precisely depend on timing of pre- and postsynaptic spikes under STDP. Because of this precise dependence, it is thought that STDP plays the important role in temporal processing. Temporal processing by STDP is well known. However, the role of STDP in spatial processing is not enough understood. In present study, we propose two type spatial filter by STDP on interconnected network. One is high-pass filter when the learning rule is hippocampal type. Another is low-pass filter when the learning rule is electric fish type. We show that synaptic modification based on STDP may play important role in spatial processing. © 2010 Springer-Verlag.


Arimoto S.,Tsuyama National College of Technology
Journal of Mathematical Chemistry | Year: 2012

The Asymptotic Linearity Theorem (ALT), which proves the Fukui conjecture in a broader context, plays a significant role in the repeat space theory (RST), which is the central unifying theory in the First and the Second Generation Fukui Project. Proving the Asymptotic Linearity Theorem Extension Conjecture (ALTEC) is a fundamental problem in the repeat space theory. The present paper constructs a class of functions MagicMtθ, which serves as a powerful tool for proving the Asymptotic Linearity Theorem Extension Conjecture and related propositions. The d-dimensional generalization μ d,n,θ of MagicMt θ, which is given in the present paper and is called a 'd-dimensional Magic Mountain', provides inwardly repeating fractals in multidimensional spaces useful for interdisciplinary research that uses the generalized repeat space theory. © 2012 Springer Science+Business Media, LLC.

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