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Effect to optical properties by changing the Al2O3 ratio in K2O-Al2O3-P2O5 glasses
D. Shiratori,Y. Isokawa,H. Samizo,M. Koshimizu,N. Kawaguchi,T. Yanagida 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.4
In this study, we prepared glasses with the composition of 0.1% Ce-doped (100−x) KPO3-xAl2O3 and investigated luminescent characteristics. The glass samples with different Al2O3 ratio (x = 5, 10, 15, 20, 25, 30 and 40) were synthesized by the melt quenching method. The All samples had high transmittance (80−90%) at wavelengths longer than 350 nm except for x = 40, and by increasing the Al2O3 ratio, the transmittance of the samples was improved. From the measurements of photoluminescence (PL) decay curve, the luminescence decay time was confirmed to be typical for the 5d−4f transition of Ce3+ (~30 ns). The samples showed thermally-stimulated luminescence (TSL), and the sensitivity of dose response was confirmed to be linear in the dose range from 0.01 mGy to 1 Gy for the x = 25 and 30 samples which showed the highest sensitivity among the present samples. The scintillation spectra show the broad luminescence around 300−500 nm, and these emission intensities were increased by increasing the Al2O3 ratio.
Extension of the adaptive boundary element scheme for the problem with mixed boundary conditions
Kamiya, N.,Aikawa, Y.,Kawaguchi, K. Techno-Press 1996 Structural Engineering and Mechanics, An Int'l Jou Vol.4 No.2
This paper presents a construction of adaptive boundary element for the problem with mixed boundary conditions such as heat transfer between heated body surface and surrounding medium. The scheme is based on the sample point error analysis and on the extended error indicator, proposed earlier by the authors for the potential and elastostatic problems, and extended successfully to multidomain and thermoelastic analyses. Since the field variable is connected with its derivative on the boundary, their errors are also interconnected by the specified condition. The extended error indicator on each boundary element is modified to meet with the situation. Two numerical examples are shown to indicate the differences due to the prescribed boundary conditions.
The catalytic activities of nanoclusters dispersed on apatite
J.Ichihara,K.Iteya,H.Kawaguchi,Y.Sasaki,H.Nakayama,S.Yamaguchi 한양대학교 세라믹연구소 2003 Journal of Ceramic Processing Research Vol.4 No.1
Cetylpyridinium phosphomolybdates (Q3[PMo12O40], Q=CetylPy) dispersed on apatite catalyzed H2O2-oxidations of organic compounds under solid-phase conditions without organic solvent. FT-IR and 31P solid-state NMR spectroscopic studies showed the formation of peroxo species in our solid-phase system, which was different from the peroxo type of CetylPy3{PO4[Mo(O)(O2)2]4} (PMo4) known as an active species in the conventional liquid-biphase system. The catalytic activities of them were compared in the solid-phase system.