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The Role of Physical Activity in Overweight and Obesity in Japanese
( Hiroaki Tanaka ),( Mayumi Yoshioka ),( Makoto Ayabe ),( Takuya Yahiro ),( Hiroyuki Higuchi ),( Yasuki Higaki ),( Jonny St Amand ),( Hideo Miyazaki ),( Yutaka Yoshitake ),( Munehiro Shindo ) 대한비만학회 2004 The Korean journal of obesity Vol.13 No.3
Formation of nano-pores on inorganic phosphate particles by the addition of urea
Hiroaki Onoda,Isao Tanaka 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.2
It is important to control the powder conditions, such as porous, globular, etc., for application of such materials. In the fields of the synthesis of inorganic materials, the addition of urea etc. gave some possibility to obtain a large specific surface area, without a change of chemical composition. Materials containing urea became porous by heating because urea decomposed to ammonia and carbon dioxide. In this study, various phosphates were prepared in aqueous solutions with and without the addition of urea. The precipitation obtained was estimated by thermogravimetry-differential thermal analysis, X-ray diffraction, and Fourier transform infrared spectroscopy. The powder properties of phosphates were studied in terms of specific surface area, pore size distribution, particle size distribution, and scanning electron microscopy images. The influence of the added urea is discussed for the development of inorganic phosphate materials. It is important to control the powder conditions, such as porous, globular, etc., for application of such materials. In the fields of the synthesis of inorganic materials, the addition of urea etc. gave some possibility to obtain a large specific surface area, without a change of chemical composition. Materials containing urea became porous by heating because urea decomposed to ammonia and carbon dioxide. In this study, various phosphates were prepared in aqueous solutions with and without the addition of urea. The precipitation obtained was estimated by thermogravimetry-differential thermal analysis, X-ray diffraction, and Fourier transform infrared spectroscopy. The powder properties of phosphates were studied in terms of specific surface area, pore size distribution, particle size distribution, and scanning electron microscopy images. The influence of the added urea is discussed for the development of inorganic phosphate materials.
Synthesis and electrical conductivity of bulk tetra-valent cerium pyrophosphate
Hiroaki Onoda,Yousuke Inagaki,Akihide Kuwabara,Naoto Kitamura,Koji Amezawa,Atsushi Nakahira,Isao Tanaka 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.3
Tetra-valent cerium pyrophosphate was synthesized from cerium oxide and phosphoric acid by heating. The sintering processes, pressure-less sintering (PLS), spark plasma sintering (SPS), and hydrothermal hot pressing (HHP), were attempted to form bulk pyrophosphate. Furthermore, the electrical conductivity of bulk cerium pyrophosphate was investigated. Tetravalent cerium pyrophosphate was synthesized by heating at 700 oC for 20 hours. The hydrothermal hot pressing process was a suitable method to synthesize bulk tetra-valent cerium phosphate.