Oita Industrial Research Institute

www.oita-ri.go.jp/
Oita, Japan
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Ohnishi O.,University of Miyazaki | Doi T.,Kyushu University | Kurokawa S.,Kyushu University | Takahashi K.,Mitsui Engineering and Shipbuilding Co. | And 3 more authors.
International Journal of Nanomanufacturing | Year: 2014

The present paper deals with the micro drilling into silicon carbide (SiC) with micro polycrystalline diamond (PCD) drills. Micro PCD drills with a nominal diameter of 300 m were fabricated by wire electrodischarge machining and they were used to drill into SiC test pieces with or without ultrasonic vibration. In the drilling test, performance of drilling into SiC was investigated. As the result of the drilling test, it was possible to make holes with good shape under all conditions. Large feed condition led to large chipping around hole entrance, bad surface roughness of hole wall and a shortened tool life. On the other hand, effects of ultrasonic vibration on chipping, surface roughness of hole wall, chip form and tool life were unclear, but the surface appearance of holes drilled with ultrasonic vibration did not seem to be affected so much by increase of feed. © 2014 Inderscience Enterprises Ltd.


Ohnishi O.,Kyushu University | Onikura H.,Kyushu University | Mizue H.,Oita Industrial Research Institute | Kido Y.,Oita Prefectural Organization for Industry Creation | And 2 more authors.
Proceedings of the 10th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2010 | Year: 2010

The present paper deals with the micro drilling into quartz glass with micro polycrystalline diamond drills, hereafter called micro PCD drills. Micro PCD drills with a nominal diameter of 300 μm are fabricated by wire electro-discharge machining, hereafter called wire-EDM. The fabricated drills have various shapes. The fabricated drills are used in the drilling into quartz glass with or without ultrasonic vibration and influences of drill geometry are investigated. As the result, it is found that a certain geometry of drill improves quality of hole entrance and hole wall. © euspen Headquarters.


Yamada K.,Saitama University | Yamada K.,Oita University | Isobe Y.,Nuclear Fuel. Ind. | Todaka T.,Oita University | And 2 more authors.
Key Engineering Materials | Year: 2015

The martensitic transformations (MT) in austenite stainless steel (SUS316) were observed by using a sensitive Flux-Gate (FG) sensor just after the magnetizations by the permanent magnet in the terrestrial field. MT in the small deformation range less than 5% elongation, was visualized by the 2-dimensional profile at each position together with the profile of the thickness deformations with an accuracy of several microns. We found the local MT enhancements up to 400[nT] at the positions along the changes of the thickness. In this experiment, the observations of MT were able to avoid the effects of the external fields or of the ac fields which was generated by the gating function in the FG sensor. © 2015 Trans Tech Publications, Switzerland.


Asaki S.,Oita Industrial Research Institute | Tsuchida S.,Omori Machinery Co.
Nippon Shokuhin Kagaku Kogaku Kaishi | Year: 2016

Airtight packages, such as freshness-keeping packaging for vegetables, can easily explode in the vacuum precooler by rapid gas expansion under decompression. Therefore, we developed packaging with degassing holes to maintain high airtightness during the distribution process. Packages were manufactured using an automatic reverse pillow packing apparatus with 20-25 μm oriented polypropylene film (OPP). It is important that the expanded gas in the package be exhausted outside immediately. Therefore, we made flat and wide ventilation holes in the center seal area of the pillow film package, allowing any expanded gas to be exhausted immediately and preventing the packaging from exploding. As for the heat sealer of the packer, two grooves of 6-10 mm are imprinted with a circumference of 350 mm. There are two vents on a standard 520 mm long type film package. The vent holes are made on the center seal area. Therefore, the top seal of both ends create a seat folding. This structure and moisture of the package increase airtightness of the package. In a storage test at 20°C using Chinese chives, the gas density of the package showed low oxygen and a high carbon dioxide concentration on the second day. Product freshness was improved in comparison to the previous open-type package of Oita Prefecture at 20°C stored for at least 3 days. Copyright© 2016, Japanese Society for Food Science and Technology.


Tanaka G.,Gunma Museum of Natural History | Taniguchi H.,Oita Industrial Research Institute | Maeda H.,Kyoto University | Nomura S.-I.,Kyoto University
Geology | Year: 2010

Greenish-blue metallic colored fossil elytra of the leaf beetle (Plateumaris sp.) have been discovered in the peat sediment of the middle Pleistocene (ca. 600 ka) Hirabaru Formation, Kyushu, Japan. Scanning and transmission electron microscopy revealed the smooth outer surface of the fossil elytra and five alternating electron-dense and electron-lucent layers in the epicuticle. By applying the matrix method to the epicuticle, three reflective peaks of wavelengths 388 nm, 544 nm, and 656 nm were computed. These peaks correspond to the reflective color observed under white light. Thus, the coloration of the fossils was caused by multilayer reflectors of the epicuticle of the elytra. Pyrolysis-gas chromatography-mass spectrometric analysis revealed that the fossil elytra have preserved some of their original macromolecules (chitin, protein, and amino acids), which are similar to those of a related Holocene species. The high-porosity matrix of the peat contains many fragments of diatoms, indicating the high productivity of the water column but a reducing bottom environment. Slight acidity of the interstitial water also seems to contribute to the preservation of some original macromolecules of fossil insects through geologic time. © 2010 Geological Society of America.


Matsuda M.,Future Product Corporation | Shimoji H.,Oita Industrial Research Institute | Shimoji H.,Oita University | Yamada K.,Future Product Corporation | Yamada K.,Oita University
Materials Science Forum | Year: 2016

New applications of nano-scale powders of Si, SiO2 and BaTiO3, etc. have been developed for vacuum sealing, reflectors in LED devices and thermally cooling membranes from metal surface. The optical transparency and good vacuum sealing were formed in baking temperatures as low as 150°C, 1hr by using nano-scale powders of these materials. We show the several applications of capacitors with the material thicknesses between 1 and 10 μm, and show the thermally cooling enhancements in several metals of Al, Fe and stainless steel up to 2.5deg/s in the metal temperature range higher than 50°C. © 2016 Trans Tech Publications, Switzerland.


Kutsukake A.,Oita Industrial Research Institute | Kido Y.,Oita Industrial Research Institute | Ikeda T.,Oita Industrial Research Institute | Enokizono M.,Oita University
IEEJ Transactions on Fundamentals and Materials | Year: 2014

In recent years, the precise magnetic properties of electrical steel sheet are needed to develop high efficiency electromagnetic devices. An IEC standard single sheet tester is often used for the magnetic property measurement, especially for commercial transactions. But it is not accurate, so is not proper for the material evaluation based on its precise properties data. Therefore, we developed the measurement technique for the precise magnetic properties of electrical steel sheet. In this paper, two single sheet testers are shown. One is according to IEC standard (IEC-SST), and the other, the Stress load type-Single Sheet Tester (S-SST) is originally designed with our measurement technique for the precise magnetic properties. The key technology for evaluation of electrical steel sheet is proposed, using the S-SST and the IEC-SST. In particular, magnetic field strength distribution in measurement area inside exciting coil and solution of H coil specification difference are studied. And the magnetic properties of the S-SST and the IEC-SST are compared. © 2014 The Institute of Electrical Engineers of Japan.


Kai Y.,Oita University | Enokizono M.,Oita University | Kido Y.,Oita Industrial Research Institute
IEEJ Transactions on Fundamentals and Materials | Year: 2013

It is well known that magnetic properties of electrical steel sheets are influenced due to mechanical stress strongly. We have been measured residual stress distribution with a X-ray stress measurement device and clarified not only the tensile and compressive stress but also the shear stress in a rotating machine core. In particular, the influence of the shear stress on the magnetic property has not been reported. We try to develop a new measurement system of vector magnetic property under the shear stress. This paper presents a mechanism to apply the shear stress and the measured vector magnetic property of a non-oriented electrical steel sheet under the shear stress. As these results, the difference of the vector magnetic property of the non-oriented electrical steel sheet was obtained according to the shear stress. © 2013 The Institute of Electrical Engineers of Japan.


Kai Y.,Oita University | Enokizono M.,Oita University | Kido Y.,Oita Industrial Research Institute
Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi) | Year: 2015

It is well known that the magnetic properties of electrical steel sheets are influenced strongly by mechanical stress. We have measured the residual stress distribution with an X-ray stress measurement device and clarified not only the tensile and compressive stress but also the shear stress in a rotating machine core. In particular, the influence of the shear stress on the magnetic properties has not previously been reported. We attempt to develop a new system for measurement of vector magnetic properties under shear stress. This paper presents a mechanism for applying shear stress and the measured vector magnetic properties of nonoriented electrical steel sheet under shear stress. These results indicate that the difference in the vector magnetic properties of the nonoriented electrical steel sheets depended on the shear stress. © 2015 Wiley Periodicals, Inc. Electr Eng Jpn,.


Kai Y.,Oita University | Enokizono M.,Oita University | Kido Y.,Oita Industrial Research Institute
International Journal of Applied Electromagnetics and Mechanics | Year: 2014

Electrical steel sheet that is used as a core in electrical machines deteriorates due to residual stress and external stress. The magnetic properties and stress need to be clarified in order to effectively utilize electrical steel sheet in electrical machines. We have measured the residual stress distribution in a motor core using an X-ray stress measurement device and clarified not only the tensile and compressive stress distributions, but also the shear stress distribution. In this study, a new measurement system is developed for determining vector magnetic properties under shear stress. The vector magnetic properties of the non-oriented electrical steel sheets under the alternating magnetic flux and rotating magnetic flux conditions were measured with the developed system. As the result, it was clear that the magnitude of the magnetic field strength vector and the magnetic power loss along the direction of about 135° increased by applying the shear stress. © 2014 - IOS Press and the authors.

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