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A Constitutive Model for Sintering of Granulated Ceramic Powders
Shinagawa, K .,Hirashima, Y . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
Sintering behavior of granulated powder is investigated to develop a constitutive model for deformation analysis of ceramic powder compacts during sintering. Spray-dried alumina is compacted by CIPing (cold isostatic pressing) and sintered at various temperatures. Shrinkage and the change in grain size of the compacts during sintering are revealed in relation to the inhomogeneous microstructure consisting of fractured and unfractured granules as a consequence of the compaction. A constitutive model for the ceramic powder compacts having the internal structure is presented. The difference in grain growth in dense and sparse regions of the compacts is taken into consideration to the model. The results calculated by the model show good agreement with that obtained by experiment.
Tohru Iuchi,Ryo Shinagawa 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
The temperature dependence on transmittance of a silicon wafer is well known, which is caused by various absorption mechanisms over wide range of spectrum. As the wavelength increases, the photon energy decreases until it becomes smaller than the minimum energy gap in the silicon band structure. At this point there is a rapid drop in absorption, which is often referred to as absorption edge wavelength. The absorption edge shifts to a longer wavelength with increasing temperature because the band gap reduces with increasing temperature. Experiments were carried out from the viewpoints of wavelength (900 ~1700 nm), polarization (p- and s-polarized) and direction (normal to 80º) for specimens with different resistivity (0.01 ~ 2700 Ωcm). A characteristic curve between absorption edge wavelength and temperature is obtained for all of silicon wafers with different resistivity. The results show that this method is promising for in situ temperature measurements of silicon wafers from room to 1000 K at a wavelength where the wafers are semitransparent. In this paper, an experimental apparatus, measurement results and considerations on advantages and disadvantages of this method are described in detail.
Koki Sugimoto,Taiki Shinagawa,Katsuo Kuroki,Saki Toma,Ryota Hosomi,Munehiro Yoshida,Kenji Fukunaga 한국식품영양과학회 2023 Preventive Nutrition and Food Science Vol.28 No.3
Bamboo charcoal (BC) powder is prepared from thick bamboo stems via dry distillation and is often used for food coloring. Due to the unique structure of the micropores in bamboo stems, BC powder also serves as an indigestible carrier to prevent the absorption of toxic substances and nutrients from the digestive tract. This study evaluated the health-promoting function of BC, particularly its effects in decreasing visceral adipose tissue in a mouse model with high-fat diet (HFD)-induced obesity. Four-week-old male C57BL/6J mice were divided into three groups and fed either a low-fat (LF) diet (7% fat), HF diet (25% fat), or HF diet with 0.5% BC (HF-BC). After 80 days, the HF-BC diet was found to have decreased epididymal and mesenteric white adipose tissue weights compared to HFD. The inhibition of visceral fat accumulation by BC intake was partly due to enhanced fecal fatty acid excretion induced by its bile acid-binding and pancreatic lipase inhibition. Contrarily, the gut microbiota, known to influence systemic energy metabolism, did not change significantly between the HF and HF-BC groups. These results indicate that dietary BC inhibits visceral fat accumulation, which could reduce obesity development.