Industrial Technology Center Of Okayama Prefecture

Okayama, Japan

Industrial Technology Center Of Okayama Prefecture

Okayama, Japan
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Takizawa K.,Mitsui Engineering and Shipbuilding Co. | Kunitsugu S.,Industrial Technology Center Of Okayama Prefecture
IEEE Transactions on Plasma Science | Year: 2016

Electron temperatures in Ne or Ar plasma produced by a dc magnetron sputtering source were measured by 2-D optical emission spectroscopy using a charge-coupled device camera. In addition, diamond-like carbon (DLC) films were prepared on glass plates using the same sputtering equipment. When increasing dc target current between 0.5 and 2.5 A, we observed a change in Raman spectra accompanied by increases in electron density and electron temperature. In Ar plasmas with a lower pressure and a higher target current, we obtained relatively hard DLC films, which is consistent with the change in the electron temperature. © 1973-2012 IEEE.

Shibakami M.,Japan National Institute of Advanced Industrial Science and Technology | Tsubouchi G.,Japan National Institute of Advanced Industrial Science and Technology | Nakamura M.,Industrial Technology Center Of Okayama Prefecture | Hayashi M.,University of Miyazaki
Carbohydrate Polymers | Year: 2013

We have fabricated a polysaccharide nanofiber made from paramylon (β-1,3-glucan), a storage polysaccharide stored as a micrometer-sized particle in the cell of euglenoid alga. Preparation of this nanofiber primarily hinges on the bottom-up approach. First, paramylon, which is originally present in the form of a bundle of nanofibers in a particle, was fibrillated to a randomly coiled polymer by dissolving the particle in a 1.0-mol/L NaOH aqueous solution. Second, the randomly coiled polymer was allowed to self-assemble into a triplex as the NaOH concentration was reduced to 0.25-0.20 mol/L. Third, a 20-nm-width nanofiber made from the triplex emerged in the solution when the NaOH concentration was reduced to approximately 0.20 mol/L. © 2012 Elsevier Ltd.

Sanada A.,Industrial Technology Center Of Okayama Prefecture | Tanaka N.,Tokyo Metroplitan University
Applied Acoustics | Year: 2013

To enhance the effect of a sound absorber having Helmholtz resonators in a wide frequency range, a sound absorber with two-degree-of-freedom (two-DOF) Helmholtz-based resonators is proposed. The resonator has a flexible panel installed in its cavity so that the panel can be vibrated by incident sound. Thus, the resonator acts as a two-DOF system. The resonant frequency of the system consisting of the panel and back cavity is designed to tune to that of a conventional resonator system, splitting the absorption resonant peak into two. Moreover, by adjusting the dimensions, damping, and other characteristics of the proposed resonator, the absorption coefficient can be improved. However, the effect of these parameters is complicated; therefore, it is difficult to design a sound absorber with the appropriate characteristics. Hence, in this paper the fundamental characteristics of the proposed absorbers are investigated. The absorption coefficient and specific acoustic impedance are derived analytically using dimensionless parameters. The effects of the parameters are examined, and a practical method of broadening the frequency range of the effective sound absorption is discussed. Furthermore, a method in which the absorbent material is installed into the back cavity is proposed in order to extend the frequency range of the resonator-type sound absorber. Finally, experimental results are presented to confirm the validity of the proposed resonator. © 2012 Elsevier Ltd. All rights reserved.

Sanada A.,Industrial Technology Center Of Okayama Prefecture | Tanaka N.,Tokyo Metroplitan University
Journal of the Acoustical Society of America | Year: 2012

This study deals with the feedforward active control of sound transmission through a simply supported rectangular panel using vibration actuators. The control effect largely depends on the excitation method, including the number and locations of actuators. In order to obtain a large control effect at low frequencies over a wide frequency, an active transmission control method based on single structural mode actuation is proposed. Then, with the goal of examining the feasibility of the proposed method, the (1, 3) mode is selected as the target mode and a modal actuation method in combination with six point force actuators is considered. Assuming that a single input single output feedforward control is used, sound transmission in the case minimizing the transmitted sound power is calculated for some actuation methods. Simulation results showed that the (1, 3) modal actuation is globally effective at reducing the sound transmission by more than 10 dB in the low-frequency range for both normal and oblique incidences. Finally, experimental results also showed that a large reduction could be achieved in the low-frequency range, which proves the validity and feasibility of the proposed method. © 2012 Acoustical Society of America.

Kono I.,Industrial Technology Center Of Okayama Prefecture
Nippon Shokuhin Kagaku Kogaku Kaishi | Year: 2011

Red mold rice, fermented by the genus Monascus (Beni-koji), is used as a traditional foodstuff in Asian countries. Beni-koji is effective in decreasing blood pressure, reducing plasma cholesterol levels, and preserving food. The solid fermentation of colored rice or coix lacryma-jobi with Monascus pilosus was examined. Culture methods for increasing the production of functional constituents and the addition of new functions, anti-oxidant activity and learning behavior, were examined. Beni-koji produced with M. pilosus is considered to be a contribution to the development of foods with high functionality.

Sanada A.,Industrial Technology Center Of Okayama Prefecture
Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C | Year: 2013

This paper deals with an active acoustic enclosure for high precision measurement apparatuses such as Atomic Force Microscope; AFM, etc. Usually these apparatuses are installed in heavy enclosure boxes in order to prevent the vibration due to surrounding noises. But the weight of the enclosure may limit the installation site because the heavy enclosure needs strong floor. By applying active sound transmission control method tothe panels of the enclosure, high-performance and lightweight can be realized simultaneously. We have proposed the active control method of transmitted sound power through a panel using four point force actuators and have both theoretically and experimentally demonstrated the high performance of this method. In this study, the proposed active control method is applied to the five panels of an enclosure and its performance is verified experimentally. The positions of the point force actuators are carefully considered to excite vibration on the panels so that the transmitted sound is effectively suppressed. Furthermore, one quadratically shaped PVDF film stripe is used as an error sensor to suppress the sound pressure inside the enclosure globally. The experimental results in the case that the PVDF film sensors are used are compared to those that a conventional microphone is used. © 2013 The Japan Society of Mechanical Engineers.

To develop the large-scale production of alkali-resistant Shirasu porous glass (SPG) membranes based on phase separation and subsequent acid leaching, the crystallization and phase separation in mother glasses in the NaO-CaO-Al2O3-B2O3-SiO2 system containing ZrO2 were investigated. A crystalline phase of wollastonite (CaSiO3) was formed in the ZrO2-free mother glass heat-treated at approximately 900°C, corresponding to the glass-shaping temperature. This crystallization was induced by the phase separation in the mother glass. The crystallization tendency was reduced by adding ZrO2 to the mother glass due to an increase in the glass viscosity, and there was no crystallization in the mother glass with 3.5mol.% ZrO2. SPG membranes containing 3mol.% ZrO2 were successfully prepared from the mother glass with 3.5mol.% ZrO2 by the phase separation of the mother glass at 700-760°C and subsequent acid leaching with a 0.5moldm-3 hydrochloric acid. The membranes had an interconnected pore structure over a wide pore diameter range of 0.1-10μm. The membrane pore diameter increased with increasing heat-treatment temperature and holding time during the phase-separation process for the mother glass. The alkali resistance of the membranes was about 3.5 times higher than that of conventional SPG membranes. © 2010 Elsevier B.V.

Sawai Y.,Okayama University | Nishimoto S.,Okayama University | Kameshima Y.,Okayama University | Fujii E.,Industrial Technology Center Of Okayama Prefecture | Miyake M.,Okayama University
Langmuir | Year: 2013

The photoinduced wettabilities of water, n-hexadecane, dodecane, and n-heptane on a flat TiO2 surface prepared by a sol-gel method-based coating were investigated. An amphiphilic surface produced by UV irradiation exhibited underwater superoleophobicity with an extremely high static oil contact angle (CA) of over 160. The TiO2 surface almost completely repelled the oil droplet in water. A robust TiO2 surface with no fragile nanomicrostructure was fabricated on a Ti mesh with a pore size of approximately 150 μm. The fabricated mesh was found to be applicable as an oil/water separation filter. © 2013 American Chemical Society.

Toida J.,Industrial Technology Center Of Okayama Prefecture
Nippon Shokuhin Kagaku Kogaku Kaishi | Year: 2014

The aim of this study was the development of miso with high quality and value by mutation breeding of koji molds with superior characteristics. We selected mutants generated by MNNG treatment of koji molds, and obtained two kinds of applicable strains for miso production. One is a high vitamin B2-producing strain with high neutral protease activity (R2 strain), which is useful for improving the color and taste of miso. The other is a high lipase-producing strain (NT12 strain), which increases miso functionality. We compared each mutant to BF-1, the commercial koji mold used as the control strain, during both laboratory-scale and pilot-scale miso fermentation. The koji manufactured from the R2 mutant showed high protease activity and contained 2~3 times more vitamin B2that manufactured from BF-1. In addition, the miso from the R2 strain showed higher x and y color values than that from BF-1, although the Y value (%) was some what lower. It also contained high contents of both formol and water soluble nitrogen, and its color brightness and umami taste were evaluated well. On the other hand, the koji from the NT12 mutant showed lipase activity about 3 times higher than that from BF-1. The resulting miso using the NT12 strain was high in fatty acid ethyl esters, and showed higher inhibitory effects on the growth of tumor cells in vitro comparedto BF-1. © 2014, Japanese Society for Food Science and Technology.

Kouka K.,Industrial Technology Center Of Okayama Prefecture | Hikasa S.,Industrial Technology Center Of Okayama Prefecture
Kobunshi Ronbunshu | Year: 2015

Influence of filler diameter on fatigue resistance of polypropylene (PP)/filler composite was investigated. Several kinds of calcium carbonate having mean diameters from 0.12 to 20 μm were used as fillers. Fillers were surface-treated with fatty acids in order to prevent the aggregation of filler particles. Tensile yield stress of the composite was lower than that of pure PP. That showed little dependence on the filler diameter. Also, it seemed that there is no interfacial adhesion between PP and filler. The fatigue property of PP/filler composite was lower than that of pure PP. The composites including filler with smaller diameter showed better fatigue resistance than the ones with filler with larger diameter. Especially, the composites including fillers having mean diameters of 0.9 and 0.12 urn showed remarkably high fatigue resistance. © 2015, The Society of Polymer Science, Japan.

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