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Rheology and pipeline transportation of dense fly ash-water slurry
Usui, Hiromoto,Li, Lei,Suzuki, Hiroshi The Korean Society of Rheology 2001 Korea-Australia rheology journal Vol.13 No.1
Prediction of the maximum packing volume fraction with non-spherical particles has been one of the important problems in powder technology. The sphericity of fly ash particles depending on the particle diameter was measured by means of a CCD image processing instrument. An algorithm to predict the maximum packing volume fraction with non-spherical particles is proposed. The maximum packing volume fraction is used to predict the slurry viscosity under well dispersed conditions. For this purpose, Simha's cell model is applied for concentrated slurry with wide particle size distribution. Also, Usui's model developed for aggregative slurries is applied to predict the non-Newtonian viscosity of dense fly ash - water slurry. It is certified that the maximum packing volume fraction for non-spherical particles can be successfully used to predict slurry viscosity. The pressure drop in a pipe flow is predicted by using the non-Newtonian viscosity of dense fly ash-water slurry obtained by the present model. The predicted relationship between pressure drop and flow rate results in a good agreement with the experimented data obtained for a test rig with 50 mm inner diameter tube. Base on the design procedure proposed in this study, a feasibility study of fly ash hydraulic transportation system from a coal-fired power station to a controlled deposit site is carried out to give a future prospect of inexpensive fly ash transportation technology.
Rheological characteristics of non-spherical graphite suspensions
Mustafa, Hiromoto Usui,Ishizuki, Masanari,Shinge, Ibuki,Suzuki, Hiroshi The Korean Society of Rheology 2003 Korea-Australia rheology journal Vol.15 No.1
Since the microstructure of functional thin films depends on the dispersion characteristics of dense slurry, it is important to control the agglomerative nature of slurries under processing. The present authors have been discussing the model prediction of agglomerative nature and local rate of agglomeration in dense suspensions. The experiments have been peformed under shear flow using the nearly spherical and oblate type graphite particles. In this study, the experiment has been conducted using water and glycerol as dispersion media. Stress control type rheometer was used to measure the slurry rheology. Local agglomeration of graphite particles has been predicted by using Usui's model. The experimental results show that both the shape and slurry processing method affect on the local dispersion condition. The agglomeration formed by oblate type graphite particles seems to be more difficult to break up than that of spherical particles.
A PANORAMIC VIEW OF THE ASTEROIDS IN THE INNER SOLAR SYSTEM WITH AKARI
Usui, F.,Kuroda, D.,Muller, T.G.,Hasegawa, S.,Ishiguro, M.,Ootsubo, T.,Ueno, M.,AKARI SOSOS team, AKARI SOSOS team The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
We constructed an unbiased asteroid catalog from the mid-infrared part of the All-Sky Survey with the Infrared Camera (IRC) on board AKARI. About 20% of the point source events recorded in the IRC All-Sky Survey observations were not used for the IRC Point Source Catalog in its production process because of a lack of multiple detection by position. Asteroids, which are moving objects on the celestial sphere, are included in these "residual events" We identified asteroids out of the residual events by matching them with the positions of known asteroids. For the identified asteroids, we calculated the size and albedo based on the Standard Thermal Model. Finally we had a new brand of asteroid catalog, which contains 5,120 objects, about twice as many as the IRAS asteroid catalog.
Usui, T.,Urano, K.,Suzuki, S.,Hioki, K.,Maruyama, Ch.,Tomisawa, M.,Ohnishi, Y.,Suemizu, H.,Yamamoto, S. Korean Society of ToxicologyKorea Environmental Mu 2001 Toxicological Research Vol.17 No.-
The international pharmaceutical and regulatory communities had been recognizing the limited utility of conventional rodent carcinogenicity study particularly on the second species, mouse, after intense investigation of carcinogenicity data base worldwide, and a new scheme for carcinogenicity testing for pharmaceuticals was proposed at the Expert Working Group on Safety in the International Conference on Harmonization (ICH) in 1996. CB6F 1-Tg rasH2 mouse carrying human prototype c-Ha-ras gene with its own promoter/enhancer is one oj the new carcinogenicity assay model for human cancer risk assessment. Studies have been conducted since 1992 to validate the transgenic (Tg) mice for rapid carcinogenicity test-ing, short term (26 weeks) studies with genotoxic (by Salmonella), non-genotoxic carcinogens, genotoxic non-carcinogens, non-genotoxic non-carcinogens revealed relatively high concordance oj the response of the Tg mouse with classical bioassay across classes of carcinogenic agents. Mechanistic basis for carcinogensis in the model are being elucidated in terms of the role of overexpression and/or point mutation of the transgene. This report review the initial studies of validation of the model and preliminary results of on-going ILSI HESI ACT project will be presented.
Taichi Usui,Takeomi Murata 한국생물공학회 2002 Biotechnology and Bioprocess Engineering Vol.7 No.5
Our purpose is to develop an efficient synthetic method of obtaining oligosaccharide unit insufficient amounts to study functions of glycans. Many exoglycosidases have been used as tools for the oligosaccharide synthesis. In contrast, a limited number of reports are available on the utilization of endoglycosidases. We describe herewith the efficient synthetic method of useful oligosaccharides and derivatives as biomaterials utilizing lysozyme, cellulase, and lacto-N-biosidase-mediated transglycosylations.
Silicon TFTs at the Dawn of FPD Technology
Setsuo Usui 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
This article reviews the research and development of crystalline Si films of early days (1980s∼) conducted in laboratories. Thin film transistors (TFTs) for large-area devices, such as contact-type image sensors and flat panel displays, were extensively investigated using ZMR (zone melting recrystallization) or Ar-ion laser annealing. In search of SOI (silicon on insulator) on glass substrates, the excimer laser annealing method was introduced to manufacture LTPS (low temperature poly-Si) TFTs on low-cost glass substrates and TFTs with good characteristics emerged as a result of using LTPS. This technology still has many problems and issues, but is pushed forward aiming at the realization of LTSS (low temperature single-crystalline silicon) films.
Fumihiko Usui,SUNAO HASEGAWA,Masateru Ishiguro,THOMAS G. MULLER,TAKAFUMI OOTSUBO 한국천문학회 2017 天文學論叢 Vol.32 No.1
Presently, the number of known asteroids is more than 710,000. Knowledge of size andalbedo is essential in many aspects of asteroid research, such as the chemical composition andmineralogy, the size-frequency distribution of dynamical families, and the relationship between smallbodies in the outer solar system or comets. Recently, based on the infrared all-sky survey data obtainedby \emph{IRAS}, \emph{AKARI}, and \emph{WISE}, the large asteroid catalogs containing size and albedo datahave been constructed. In this paper, we discuss the compositional distribution in the mainbelt regions based on the compiled data on size, albedo, and separately obtained taxonomic typeinformation.