Ichinoseki National College of Technology

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Ichinoseki, Japan
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Sato K.,Ichinoseki National College of Technology
Kagaku Kogaku Ronbunshu | Year: 2017

Experiments were carried out to concentrate lactic acid by means of electrodialysis. Under certain operating conditions, the process was hindered by an increase in the volume of the concentrated solution as a result of water permeation across the membranes due to electro-osmosis and the difference in osmotic pressures. A necessary operating condition for successful concentration of lactic acid was that the concentration difference between the concentrated and dilute solutions should not be too large. The highest concentration of lactic acid economically achieved by electrodialysis was 50 wt%. This upper limit was related to an acute increase in the electrical resistance of lactic acid solution. In successive operations, it was found possible to concentrate lactic acid solution from 7 to 50 wt% through 13 cycles of electrodialysis. © 2017 The Society of Chemical Engineers, Japan.


Osada M.,Ichinoseki National College of Technology | Kikuta K.,Ichinoseki National College of Technology | Yoshida K.,Ichinoseki National College of Technology | Totani K.,Ichinoseki National College of Technology | And 2 more authors.
Green Chemistry | Year: 2013

Non-catalytic synthesis of 2-acetamido-2,3-dideoxy-d-erythro-hex-2- enofuranose (Chromogen I) and 3-acetamido-5-(1′,2′-dihydroxyethyl) furan (Chromogen III) from N-acetyl-d-glucosamine (GlcNAc) was achieved, with the highest yields of 23.0% and 23.1%, respectively, in high-temperature water at 120-220 °C and 25 MPa with a reaction time of 7-39 s. This journal is © 2013 The Royal Society of Chemistry.


Fujimoto H.,Railway Technical Research Institute | Murakami A.,Ichinoseki National College of Technology
Physics Procedia | Year: 2012

Fracture toughness properties of melt growth GdBa2Cu3Ox (Gd123) large single domain superconducting bulks with with Ag2O of 10 wt% and Pt of 0.5 wt%; 45 mm in diameter and 25 mm in thickness with low void density were evaluated at 77 K through flexural tests of specimens cut from the bulks, and compared to those of a conventional Gd123 with voids. The densified Gd123 bulks were prepared with a seeding and temperature gradient method; first melt processed in oxygen, then crystal growth in air; two-step regulated atmosphere heat treatment. The plane strain fracture toughness, KIC was obtained by the three point flexure test of the specimens with through precrack, referring to the single edge pre-cracked beam (SEPB) method, according to the JIS-R-1607, Testing Methods for Fracture Toughness of High Performance Ceramics. The results show that the fracture toughness of the densified Gd123 bulk with low void density was higher than that of the standard Gd123 bulk with voids, as well as the flexural strength previously reported. We also compared the fracture toughness of as-grown bulks with that of annealed bulks. The relation between the microstructure and the fracture toughness of the Gd123 bulk was clearly shown. © 2012 Published by Elsevier B.V. Selection and/or peer-review under responsibility of the Guest Editors.


Yamamoto Y.,Accelerator Centre | Furumoto T.,Ichinoseki National College of Technology | Yasutake N.,Chiba Institute of Technology | Rijken Th.A.,Accelerator Centre | Rijken Th.A.,Radboud University Nijmegen
Physical Review C - Nuclear Physics | Year: 2014

A multi-Pomeron exchange potential (MPP) is proposed as a model for the universal many-body repulsion in baryonic systems on the basis of the extended soft core (ESC) baryon-baryon interaction. The strength of the MPP is determined by analyzing the nucleus-nucleus scattering with the G-matrix folding model. The interaction in ΛN channels is shown to reproduce well the experimental Λ binding energies. The equation of state (EoS) in neutron matter with hyperon mixing is obtained including the MPP contribution, and mass-radius relations of neutron stars are derived. It is shown that the maximum mass can be larger than the observed one, 2M, even in the case of including hyperon mixing on the basis of model parameters determined by terrestrial experiments. © 2014 American Physical Society.


Yamamoto Y.,Accelerator Centre | Furumoto T.,Ichinoseki National College of Technology | Yasutake N.,Chiba Institute of Technology | Rijken T.A.,Accelerator Centre | Rijken T.A.,Radboud University Nijmegen
Physical Review C - Nuclear Physics | Year: 2013

A multi-Pomeron exchange potential (MPP) is proposed as a model for the three-body repulsion indicated in neutron-star matter, which works universally among three and four baryons. Its strength is determined by analyzing the nucleus-nucleus scattering with the G-matrix folding model. The equation of state in neutron matter is obtained including the MPP contribution. The neutron-star mass is calculated by solving the Tolmann-Oppenheimer-Volkof equation. The maximum mass is obtained to be larger than the observed one, 1.97Msolar, on the basis of the experimental data. © 2013 American Physical Society.


Furumoto T.,Ichinoseki National College of Technology | Sakuragi Y.,Osaka City University | Yamamoto Y.,RIKEN
Physical Review C - Nuclear Physics | Year: 2014

We investigate the sensitivity of the medium effect in the high-density region on nucleus-nucleus elastic scattering in the framework of the double-folding (DF) model with the complex G-matrix interaction. The medium effect including the three-body-force (TBF) effect is investigated with two methods. In both methods, the medium effect is clearly seen on the potential and the elastic cross section. Finally, we make clear the crucial role of the TBF effect up to kF=1.6 fm-1 in nucleus-nucleus elastic scattering. © 2014 American Physical Society.


Nakagawa Y.S.,Ichinoseki National College of Technology | Eijsink V.G.H.,Norwegian University of Life Sciences | Totani K.,Ichinoseki National College of Technology | Vaaje-Kolstad G.,Norwegian University of Life Sciences
Journal of Agricultural and Food Chemistry | Year: 2013

Industrial depolymerization of chitinous biomass generally requires numerous steps and the use of deleterious substances. Enzymatic methods provide an alternative, but fundamental knowledge that could direct potential development of industrial enzyme cocktails is scarce. We have studied the contribution of monocomponent chitinases (ChiA, -B, and -C) and the lytic polysaccharide monooxygenase (LPMO) from Serratia marcescens on depolymerization of α-chitin substrates with varying particle size and crystallinity that were generated using a converge mill. For all chitinases activity was positively correlated to a decline in particle size and crystallinity. Especially ChiC, the only nonprocessive endochitinase from the S. marcescens chitinolytic machinery, benefited from mechanical pretreatment. Combining the chitinases revealed clear synergies for all substrates tested. CBP21, the chitin-active LPMO from S. marcescens, increased solubilization of substrates with high degrees of crystallinity when combined with each of the three chitinases, but this synergy was reduced upon decline in crystallinity. © 2013 American Chemical Society.


Hirano K.,Ichinoseki National College of Technology | Komiya Z.,Tokyo University of Science
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2010

We investigate the observational constraints on the oscillating scalar field model using data from type Ia supernovae, cosmic microwave background anisotropies, and baryon acoustic oscillations. According to a Fourier analysis, the galaxy number count N from redshift z data indicates that galaxies have preferred periodic redshift spacings. We fix the mass of the scalar field as mφ=3.2×10⊃-31heV such that the scalar field model can account for the redshift spacings, and we constrain the other basic parameters by comparing the model with accurate observational data. We obtain the following constraints: Ωm,0=0.28±0.03 (95% C.L.), Ωφ,0<0.035 (95% C.L.), and ξ>-158 (95% C.L.) (in the range ξ≤0). The best fit values of the energy density parameter of the scalar field and the coupling constant are Ωφ,0=0.01 and ξ=-25, respectively. The value of Ωφ,0 is close to but not equal to 0. Hence, in the scalar field model, the amplitude of the galaxy number count cannot be large. However, because the best fit values of Ωφ,0 and ξ are not 0, the scalar field model has the possibility of accounting for the periodic structure in the N-z relation of galaxies. The variation of the effective gravitational constant in the scalar field model is not inconsistent with the bound from observation. © 2010 The American Physical Society.


Yamada N.,Nagaoka University of Technology | Watanabe M.,Nagaoka University of Technology | Hoshi A.,Ichinoseki National College of Technology
Energy | Year: 2013

The first experiment on a pumpless Rankine-type cycle (PRC) with a practical expander was performed to verify the feasibility of the PRC in power generation from low-grade heat sources. The PRC is an alternative to a Rankine cycle (RC) for lower output power and lower- and/or unstable temperature heat sources, where the conventional RC is rarely economically efficient owing to the low efficiency of the working fluid pump. The PRC mainly consists of a scroll expander, two heat exchangers, and switching valves for the expander and heat exchangers. A switching valves method that does not require the use of a working fluid pump is employed to control the PRC, hence avoiding problems such as cavitation caused by the working fluid pump. A mini-PRC experimental system showed that the PRC could successfully function with a scroll expander and produce actual power of 20 W. In addition, the PRC generated relatively larger net power than the conventional organic Rankine cycle in a very small output range. © 2012 Elsevier Ltd.


Hirano K.,Ichinoseki National College of Technology | Komiya Z.,Tokyo University of Science
International Journal of Modern Physics D | Year: 2011

We study the observational constraints on the Phantom Crossing DGP model. We demonstrate that the crossing of the phantom divide does not occur within the framework of the original Dvali-Gabadadze-Porrati (DGP) model or the DGP model developed by Dvali and Turner. By extending their model in the framework of an extra dimension scenario, we study a model that realizes crossing of the phantom divide. We investigate the cosmological constraints obtained from the recent observational data of Type Ia supernovae, cosmic microwave background anisotropies, and baryon acoustic oscillations. The best-fit values of the parameters with 1σ (68%) errors for the Phantom Crossing DGP model are Ωm, 0 = 0.27+0.02 -0.02, β = 0.54+0.24 -0.30. We find that the Phantom Crossing DGP model is more compatible with the observations than the original DGP model or the DGP model developed by Dvali and Turner. Our model can realize late-time acceleration of the universe, similar to that of ΛCDM model, without dark energy due to the effect of DGP gravity. In our model, the crossing of the phantom divide occurs at a redshift of z ∼ 0.2. © 2011 World Scientific Publishing Company.

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