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Obikawa T.,University of Tokyo | Anzai M.,Shibaura Institute of Technology | Egawa T.,Meisei University | Narutaki N.,Hiroshima University | And 2 more authors.
Advanced Materials Research | Year: 2011

This paper describes strong nonlinearity in log V-log L relationship, which is often found in machining of supperalloys, titanium alloys, hardened steels, cast irons, etc. The nonlinearity plays an important and favorable role in extension of life-span cutting distance at higher cutting speeds; that is, in a certain range of cutting speed, life-span cutting distance increases with cutting speed. Results of tool wear in a sliding test and cutting experiments, which showed the evidences of strong nonlinearity, were investigated and the mechanisms causing the nonlinearity were discussed.


Satou K.,Niigata Agricultural Research Institute | Takahashi Y.,Industrial Research Institute of Niigata Prefecture | Yoshii Y.,Niigata Agricultural Research Institute
Food Science and Technology Research | Year: 2010

When brown rice is preserved for a long period of time, a stale flavor (komai-shu) develops as a result of lipid oxidation by enzymes. In order to inactivate the enzymes, brown rice was treated with superheated steam. Superheated steam treatment for about 1 min, at all temperatures, caused a decrease in the enzymatic activity related lipid oxidation. On the other hand, the degree of starch damage did not increase during superheated steam treatment below 150°C. These results show that superheated steam treatment at a low temperature and for a short time is enough to inactivate the enzyme in brown rice, and does not influence starch quality. It was expected that enzyme inactivation by superheated steam treatment would be effective in suppressing the generation of stale flavor during long preservation periods.


Nagai N.,Industrial Research Institute of Niigata Prefecture | Okada H.,Industrial Research Institute of Niigata Prefecture | Watanabe S.,Niigata Agricultural Research Institute | Shimojo S.,Niigata Agricultural Research Institute
Applied Spectroscopy | Year: 2012

The attenuated total reflection (ATR) mode in Fourier transform infrared (FT-IR) spectroscopy has been used to detect the sugar transformations of carrots under various storage conditions. The composition of the sugars was assessed by principal component analysis (PCA) and principal component regression (PCR). The changes in the sucrose concentration of the trachea and phloem of the carrot after storage are evident. © 2012 Society for Applied Spectroscopy.


Nagai N.,Industrial Research Institute of Niigata Prefecture | Nishiyama I.,Daipla Wintes Co. | Shimada H.,Daipla Wintes Co. | Ito H.,Daipla Wintes Co. | Endoc K.,Tokyo University of Science
Applied Spectroscopy | Year: 2013

A new technique to investigate chemical structures of very thin surface (mesoscopic scale) layers of polar polymers is proposed. The chemical structures and conformations of ;100 nm-thick slabs that were obtained from a polymer surface were studied by infrared spectroscopy combined with a previously developed thin sample preparation system. The dielectric functions were calculated using oscillator models from reflection spectra of the slabs, which were cut with a diamond blade. The molecular movements caused by shear force perturbations after the cutting process ("flexed state") were observed. The technique was applied to analyze the changes in the chemical structure of bisphenol A polycarbonate (BPAPC) throughout a bending cyclic fatigue test. Three characteristic stages of structural changes in the flexed state under the cyclic fatigue test were observed. Our technique has the potential to clarify the intrinsic structures of solid polymers such as the degree of entanglement and the tendency for order or disorder caused by the surrounding chain interaction. Copyright © 2013 Society for Applied Spectroscopy.


Kazumasa K.,Niigata University | Katsuya F.,Tokyo Denki University | Satoru H.,Industrial Research Institute of Niigata Prefecture
Applied Mechanics and Materials | Year: 2013

In this paper, the cutting performance of cemented carbide with ultrafine particles using single crystal diamond for tool material in die and mold manufacturing is investigated. The flat work is done using spiral for tool pass. The flat work is divided into small area and middle area. The spiral pitch in addition to depth of cut is changed in flat work. The tool wear is also estimated from form deviation by measuring surface form before and after machining. These results showed that ductile mode cutting was possible and the tool wear could be estimated from surface form. The tool wear was large in proportion to both the depth of cut and cutting length. © (2013) Trans Tech Publications, Switzerland.


Sasaki T.,Niigata University | Hasegawa S.,Niigata University | Nakagawa M.,Industrial Research Institute of Niigata Prefecture | Yoshida S.,Southeastern Louisiana University
Conference Proceedings of the Society for Experimental Mechanics Series | Year: 2014

Water cavitation peening has been applied to thin sheets of austenitic stainless steel of 0.1 mm in thickness. The influence of cavitation peening on various factors related to the fatigue property of the material has been investigated. It has been found that the fatigue limit is increased by about approximately 10%, while no significant changes in the surface roughness and the microstructure are observed. The residual stress evaluated by Full Width at Half Maximum (FWHM) of X-ray diffraction, and the mean value of micro-hardness on the surface are slightly decreased in the peened specimen. To investigate the origin of increase in fatigue strength, deformation behavior in the tensile test has been measured using electronic speckle pattern interferometry. The optical fringe patterns by ESPI (Electronic Speckle-Pattern Interferometry) during the transitional process from the elastic deformation to the yielding have shown that local plastic deformation due to the strain concentration was suppressed by the cavitation peening. © The Society for Experimental Mechanics, Inc. 2014.


Imaizumi S.,Industrial Research Institute of Niigata Prefecture | Imaizumi S.,Tokyo Metroplitan University | Fujiyoshi M.,Tokyo Metroplitan University | Kiya H.,Tokyo Metroplitan University
IEICE Electronics Express | Year: 2010

This paper proposes an access control method for composite multimedia content in which only a single key is delivered to a user. The proposed method simultaneously controls access to each medium in one composite multimedia content in which a medium can be hierarchically encoded. This method introduces recursive hash chains for key generation so that the number of delivered key is reduced to one, whereas the conventional method having the above mentioned features has to deliver multiple keys to a user. The managed key in the proposed method is also reduced to one. © IEICE 2010.


Nagai N.,Industrial Research Institute of Niigata Prefecture | Okawara M.,Industrial Research Institute of Niigata Prefecture | Kijima Y.,Industrial Research Institute of Niigata Prefecture
Applied Spectroscopy | Year: 2016

An investigation of the infrared (IR) spectra of polyoxymethylene (POM) mold plates was undertaken to determine the sub-micron-scale morphology and molecular orientation. The nest-structured cells concerned with the orientation were observed from scanning electron microscope (SEM) measurements with the aid of Raman spectroscopy. The intensity of the anomalous IR reflectance peak of the C-O stretching A2 mode depends on the widths of the POM layers in the SEM image along the orientation direction. The results suggest that the spectral features originate from the Berreman effect of the bulk polaritons and the radiative surface polaritons. Moreover, the IR spectra of certain treated samples suggest that enhancement of the electromagnetic fields from the gap modes and transition dipole-dipole coupling influence the spectral shapes. © Society for Applied Spectroscopy.


Nagai N.,Industrial Research Institute of Niigata Prefecture
Analytical Methods | Year: 2012

A simple method based on self-organization is proposed for the separation of the components of samples on a centimeter-sized substrate plate using a technique to introduce a solvent or solution into the gap between an obliquely placed cover glass and the substrate and then generating a flow of liquid beneath the cover glass. The flow induces adsorption of different components at different positions on the substrate aligned with the cover-glass edge through Marangoni convection without any active intervention. A discussion of the composition and/or structural changes of samples is facilitated by analysis of the adsorbed species using Raman spectroscopy as a micro-probe analytical technique. The separation was demonstrated using mixed proteins, and the separation was strongly dependent not only on the surface energy of the materials and/or the Soret coefficient but also on the molecular interactions of each solute in the solutions and on the shape of the cell. The concentrations of the solutes affected the separation efficiency in this technique. © 2012 The Royal Society of Chemistry.


PubMed | Industrial Research Institute of Niigata Prefecture
Type: Journal Article | Journal: Applied spectroscopy | Year: 2013

The mold temperature dependence of bisphenol A polycarbonate (BPAPC) in the view of changing the flexed state was investigated by mid-infrared spectroscopy combined with a previously developed thin sample preparation system. The differences in the samples of different mold temperatures were clearly detected. The structural changes in the flexed state of each mold temperature were analyzed by comparing the results using dielectric function analysis of different cutting procedures. Some structure parameters were associated with the contact angle of liquids on polymer plate. The evidence suggests that mold temperature and surface wettability affects the cohesive or entanglement state of polymers at the chemical structure level.

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