Effect of Surface Morphology on the Flow of Entrained Fine Particles by Ascending Gas through Packed Beds

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.

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.

ISOLATION OF PANCREATIC ISLETS FROM SHEEP PANCREAS

Hidaka, S.,Yamaguchi, A.,Hidari, H.,Okada, M. Asian Australasian Association of Animal Productio 1989 Animal Bioscience Vol.2 No.3

Correlation between local structures and partial electronic band states in ferroelectric Bi_4-XLa_XTi₃O₁₂; 0.0 <or=x <or='1.46</main'></or=x>

Hidaka, M.,Wijesundera, R.P.,Kumara, R.,Noguchi, Y.,Miyayama, M.,Choi, S.-H.,Sung, N.E.,Kim, M.G. INSTITUTE OF CHEMICAL TECHNOLOGY/INSTITUTE OF INOR 2009 Ceramics Vol.53 No.2

Structural properties of the red-color overglazes on the Kakiemon-style porcelains produced in the later 17th century by means of X-ray diffraction (I)

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>

Local structures and electronic band states of α−Fe2O3 polycrystalline particles in the glazes of the HIZEN celadons produced in the Edo period of Japan, by means of X-ray absorption spectra (II)

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>

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.

The conditions under which V-(i)b bo‘l expresses (im)possibility in Uzbek

Hidaka Shinsuke 한국알타이학회 2024 알타이학보 Vol.- No.34

V-(i)b bo‘l- [V(erb Stem)-CVB.SEQ be-] in Uzbek (Turkic, the southeastern branch) expresses the completion of an action by V-(i)b or the possibility of the action by V-(i)b. Previous studies have not fully explained the conditions under which different meanings appear in V-(i)b bo‘l-. I clarified these conditions through interviews with native speakers and a corpus examination. Thus, I analyzed V-(i)b boʻl- not only based on its form but also from other perspectives. I examined V-(i)b boʻl- through interviews regarding the meaning, the person and adverbial phrase. In addition, I investigated all examples based on three questions related to the corpus: (1) Is there an imbalance of the verb stem in V-(i)b? (the meaning of V) (2) What are the morphological features? (morphological feature) (3) What kinds of sentences are used? (sentence type) I concluded from the interviews and the corpus examinations that V-(i)b boʻl- conveys impossibility or limited possibility if it is formally marked and the subject is third person. In contrast, V-(i)b boʻl- denotes the completion of an action if it is formally unmarked, regardless of the subject’s person. This conclusion solves the contradiction among the descriptions of previous studies. Future research should study this theme from a diachronic and areal perspective.

Preliminary Test of Affective Virtual Reality Scenes with Head Mount Display for Emotion Elicitation Experiment

Kenta Hidaka,Haoyu Qin,Jun Kobayashi 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10

Emotion elicitation experiments are conducted to collect biological signals from a subject who is in a state of emotion. The recorded signals are used as training/test dataset for constructing an emotion recognition system by means of machine learning. In conventional emotion elicitation experiments, affective images or videos were provided for a subject to draw out an emotion from them. However, the authors have concerns about the effectiveness. To surely evoke a specific emotion from subjects, we have produced several Virtual Reality (VR) scenes and provided the subjects with the scenes through a Head Mount Display (HMD) in emotion elicitation experiments. Usability and effectiveness of the VR scenes with the HMD for emotion elicitation were experimentally verified. It was confirmed that experience of the VR scenes with the HMD was effective in evoking emotions, but we have to improve how subjects learn a way of playing VR scenes and provide measures against VR sickness at any cost. Moreover, Support Vector Machine classifiers as an emotion recognition system were constructed using the biological signals measured from the subjects in the emotion elicitation experiments.

Robust color tracking based on Mean-Shift under illuminance change

Koichi Hidaka 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8

In this paper, we propose a color tracking method mean-shift based on the robust color system. Our proposed color system is simple calculation, and then proposed system can calculate faster than conventional normalized vector distance (NVD). We show validity of proposed method by experimental result that our method enables real-time color object tracking of illuminance changing conditions.