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Nakajima, Kazuo,Ujihara, Toru,Miyashita, Satoru,Sazaki, Gen The Korea Association of Crystal Growth 1999 한국결정성장학회지 Vol.9 No.4
The strain, surface and interfacial energies of III-V ternary systems were calculated for three kinds of structure modes: the Frank-van der Merwe(FM) mode, the Stanski-Krastanov(SK) mode and the Volmer-Weber(VW) mode. The free energy for each mode was estimated as functions of thickness and composition or lattice misfit. Through comparison of the free energy of each mode, it was found that the thickness-composition phase diagrams of III-V ternary systems can be determined only by considering the balance of the free energy and three kinds of structure modes appear in the phase diagrams. The SK mode appears only when the lattice misfit is large and/or the lattice layer is thick. The most stable structure of the SK mode is a cluster with four lattice layers or minimum thickness on a wetting layer of increasing lattice layers. The VW mode appears when the lattice misfit is large and the lattice layer is thin and only in the INPSb/InP and GaPSb/GaP system which have the largest lattice misfit of III-V ternary systems. The stable region of the SK mode in the GaPSb/GaP and InPSb/InP phase diagrams is largest of all because the composition dependence of the strain energy of these systems is stronger than that of the other systems. The critical number of lattice layers below which two-dimensional(2D) layers precede the three-dimensional(3D) nucleation in the SK mode at x=1.0 depends on the lattice misfit.
E-mail-based Telemonitoring System of Television’s Operating State for Elderly Persons Living Alone
Kazuki Nakajima,Takahiro Motoya,Takatoshi Suenaga,Kazuo Sasaki 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
To improve the relationship between families and elderly parents who live far apart, we have developed a telemonitoring system using the television’s operating-state (TVOS). The aim of the present study was to develop a novel system that monitors the TVOS by utilizing e-mails to solve the problems of the previous system.
Fluorescence Behavior of Benzo[f]Quinoline Doped In Lpd Silica Thin Films
Mabuchi, Toshiaki,Suzuki, Satoshi,Nakajima, Tsuyoshi,Ino, Juichi,Takemura, Kazuo,Shimizu, Etsuro Korean Society of Photoscience 1998 Journal of Photosciences Vol.5 No.3
By using the liquid -phase-deposition (LPD) process, which has a potetnial of preparing organic inorganic composite materials, samples doped with benzo[f]quinoline (BfQ)into silica thia films wre prepared. We observed the fluorescene and fluorescene excitation spectra of the samples, as well as the fluorescence lifetimes and time-resoluved fluorescence spectra. The comparison of thefluorescence spectra in pH-controlled buffer solutions yields the results that the dominant species of BfQ in the LPD silica films is a protonated one. The fluorescence band assigned to a hydrogen-bonded species was observed on the samples prepared from the dipping solutions of 3 and 2 M hexafluorosilicic acid. The band assignment was confirmed by the fluorescence lifetime measurement. The FT-IR M hexaflurosilicic acid. The band assignment was confirmed by the flurescence lifetime meausurement. The FT-IR data proved the existence of included water in silica films prepared from the LPD process. The appearance of the band corresponding to the hydrogen-bonded species within LPD silica phases was explained by the proesence of included water. Depending on the preparation conditions of LPD silica films, the band assigned to protonated species shows bad shifts in a wavenumber region between the peak of hydrogen-bonded and typical protonated species. This implies that there is some distribution of steric conformation of protonated species of BfQ interacting with adsorbing sites of LPD silica. The time -resolved fluorescence spectra suggest that some relaxation process is involved in the conformation of BfQ doped into the solid phase of LPD silica.