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Hidaka, Nobuyuki,Matsumoto, Toshitatsu,Kusakabe, Katsuki,Morooka, Shigeharu 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.6
Coarse particles of glass or cokes were packed in vertical columns, 1- and 2-m in height, and fine particles of glass or coke were entrained through the columns by the ascending gas flow. These systems were used as a model to investigate the flow of fine coal particles introduced into a blast furnace. The effects of properties of packed particles, as well as fines, on the static and dynamic holdups of fines were then investigated. The static holdup of fines was strongly affected by the surface roughness of the packed particles, while the dynamic holdup of fines was not. These results suggest that the fine particles are trapped in the form of static holdup in the isolated narrow spaces bounded with packed particles, and that they remain on the surface of the packed particles which are exposed to the gas flow for only a short period of time.
Mucosal dehiscence coverage for dental implant using sprit pouch technique: a two-stage approach
Hidaka, Toyohiko,Ueno, Daisuke Korean Academy of Periodontology 2012 Journal of Periodontal & Implant Science Vol.42 No.3
Purpose: Soft tissue recessions frequently cause esthetic disharmony and dissatisfaction. Compared with soft tissue coverage around a tooth, the coverage of an implant site is obviously unpredictable. Particularly in the cases of thin mucosa, a significant greater amount of recession takes place compared to thick mucosa. To overcome this problem, this case report demonstrates a two-step mucosal dehiscence coverage technique for an endosseous implant. Methods: A 33-year-old female visited us with the chief complaint of dissatisfaction with the esthetics of an exposed implant in the maxillary left cental incisor region. A partial-thickness pouch was constructed around the dehiscence. A subepithelial connective tissue graft was positioned in the apical site of the implant and covered by a mucosal flap with normal tension. At 12 months after surgery, the recipient site was partially covered by keratinized mucosa. However, the buccal interdental papilla between implant on maxillary left central incisor region and adjacent lateral incisor was concave in shape. To resolve the mucosal recession after the first graft, a second graft was performed with the same technique. Results: An esthetically satisfactory result was achieved and the marginal soft tissue level was stable 9 months after the second graft. Conclusions: The second graft was able to resolve the mucosal recession after first graft. This two-step approach has the potential to improve the certainty of esthetic results.
Hidaka, M.,Ohashi, K.,Wijesundera, R. P.,Kumara, L. S. R.,Sugihara, S.,Momoshima, N.,Kubuki, S.,Sung, N. E. SciELO 2011 Cerâmica Vol.57 No.342
<▼1><P>HIZEN celadon glazes produced in 1630's to 1790's (Edo period, Japan) have been investigated by means of X-ray absorption spectra (XAS) near a Fe-K edge by using synchrotron radiation and a Mössbauer spectrum. The XAS suggest that the local structure around Fe2O3 fine powders is slightly different between the Izumiyama ceramics of mainly the Quartz-SiO2 and Ohkawachi ceramics of mainly the feldspar of (K,Na)Si3O8 (Sanidine), and that the glazes of the HIZEN celadons include the Fe2O3 fine powders in the glassy state, though the X-ray diffraction patterns of the glassy celadon glazes do not show any peaks of the Fe2O3 structure. The Mössbauer spectrum suggests that the celadon glaze of Seiji (m) includes only Fe3+ ions, but not Fe2+ ions. This indicates the existence of Fe2O3 in the celadon glaze. It is interpreted that the colored brightness of the HIZEN celadons is induced by the structural properties of the used raw celadon ceramics and the other transition-metal ions of Cr, Cu, Zn in the celadon glazes, but not by the chemical reaction from Fe2O3 to FeO under the deoxidizing thermal treatment at higher temperature in a kiln.</P></▼1><▼2><P>Esmaltes de celadon Hizen produzidos dos anos 1630 a 1790 (período Edo, Japão) foram investigados por meio de espectros de absorção de raios X (XAS) próximos da linha Fe-K usando radiação síncrotron e espectro Mossbaues. Os resultados de XAS sugerem que a estrutura local em pós finos de Fe2O3 é levemente diferente entre as cerâmicas Izumiyama principalmente o quartzo e cerâmicas Ohkawachi principalmente do feldspato (K,Na)Si3O8 (Sanidine), e que os esmaltes dos celadons Hizen incluem finos pós de Fe2O3 no estado vítreo, embora os difratogramas de raios X dos esmaltes celadon não mostrem picos da estrutura do Fe2O3. O espectro Mossbauer sugere que os esmaltes celadon de Seiji (m) incluem somente íons Fe3+, mas não Fe2+. Isto indica a existência de Fe2O3 no esmalte celadon. É feita a interpretação que o brilho nas cores dos celadons Hizen é induzido pelas propriedades estruturais das cerâmicas básicas de celadon e os outros metais de transição Cr, Cu, Zn nos esmaltes celadon, mas não pela reação química entre Fe2O3 para FeO sob tratamento térmico desoxidante em forno a altas temperaturas.</P></▼2>
Hidaka, M.,Horiuchi, H.,Ohashi, K.,Wijesundera, R. P.,Kumara, L. S. R.,Choi, Jae-Young,Park, Yong Jun SciELO 2009 Cerâmica Vol.55 No.334
<▼1><P>Kakiemon-style porcelains produced at Arita areas (SAGA) in Kyushu Island are famous Japanese porcelains. The porcelain-techniques creating its elegant and bright red-color underglaze and overglaze were found and developed in 1650's (early Edo period) first by Kakiemon kiln. Red-color overglaze and transparent glaze of the Kakiemon-style porcelains have been investigated by means of X-ray diffraction using synchrotron radiation. The results suggest that the red-color brightness is mainly induced by micro-structural correlation between α-Fe2O3 fine particles, as red-color emission elements, and other oxides of SiO2, Al2O3, CaO, KNaO, PbO. The stability of the red-overglaze on the porcelain surface is related to interfacial fusion of the glasses existing in the fritted red-overglaze and the transparent glaze on the porcelain body. The ancient porcelain-techniques of the Kakiemon-style porcelains are clearly based on the micro-structural and material properties of the overglazes, the underglazes, and the transparent glazes, though the techniques were experimentally and accidentally found and developed in the Edo period.</P></▼1><▼2><P>As porcelanas do estilo Kakiemon produzidas nas áreas de Arita (SAGA) na ilha Kyushu são porcelanas japonesas famosas. As técnicas de produzir porcelanas com os elegantes e brilhantes vidrados de cores vermelho brilhante foram encontradas e desenvolvidas nos anos 1650 (início do período Edo) primeiramente em fornos Kakiemon. Vidrados vermelhos e vidrados transparentes de porcelanas do estilo Kakiemon foram investigadas por meio de difração de raios X com radiação sincrotron. Os resultados sugerem que o brilho de cor vermelha é principalmente induzido pela correlação microestrutural entre finas partículas de α-Fe2O3, como elementos emissores de cor vermelha, além de outros óxidos como SiO2, Al2O3, CaO, KNaO, e PbO. A estabilidade dos vidrados na superfície da porcelana com vidrado vermelho está relacionada com a fusão interfacial dos vidros existentes no vidrado vermelho calcinado e o vidrado transparente do corpo da porcelana. As antigas téncias de porcelana do estilo Kakiemon são claramente baseadas nas propriedades microestruturais do material dos vidrados sobrepostos, os sub-postos e os transparentes, embora as técnicas tenham sido encontradas e desenvolvidas experimental e acidentalmente no período Edo.</P></▼2>
Junction, Circuit and System Developments for a High-$T_c$ Superconductor Sampler
Hidaka, M.,Satoh, T.,Tahara, S. The Korean Superconductivity Society 2000 Progress in superconductivity Vol.1 No.2
A Josephson sampler circuit using high-Tc superconductor (HTS) ramp-edge junctions has been designed, fabricated, and experimentally tested. It consists of five ramp-edge junctions with a stacked groundplane and is based on single-flux-quantum (SFQ) operations. The sampler was used to measure current waveforms at picosecond and microampere resolutions. We are developing a system based on the sampler for measuring the current waveform in a room-temperature sample. And measuring current flowing through wiring in a semiconductor large-scale integrated circuit is a promising application for the HTS sampler system.
Stability Analysis of Wnt-ERK cellular signalling by using Nyquist Criterion
Taisei Hidaka,Takashi Nakakuki 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
We have previously reported an analysis method for intracellular signal transduction systems by using Nyquist criterion in which we provided a proof-of-principle study with the Goodwin oscillator as a simple model that is a threedimensional small system with a negative feedback regulation. In this study, we try to apply our method based on Nyquist criterion to a practical cancer cell signalling model on the Wnt-ERK pathway that is a 31-dimensional ordinary differential equation system with the six multiple feedback regulations. In this study, two different feedback loops that are mediated by a same signalling molecule are investigated. By applying our method to the analysis of each feedback loop independently, the effect of them on the stability of the whole system is compared.