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Nomura,Tsuyoshi,Suzuki,Motoyuki 嶺南大學校 環境問題硏究所 1995 環境硏究 Vol.15 No.1
Porous membrane of poly(tetrafluoroethylene)(PTFE) was formed on the surface of porous ceramic tubes by means of heat treatment of the PTFE particles deposit layer prepared by filtering PTFE microparticles emulsified in aqueous phase. By means of inert gas permeation, pore size was determined and compared with scanning electron micrograph observation. Also rejection measurement of aqueous dextran solutions of wide range of molecular weights showed the consistent result regarding the pore size. Since the membrane prepared by this method is stable and has unique features derived from PTFE, it is expected that the membrane has interesting applications in the field of water treatment.
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.
Information Gathering by wireless camera node with Passive Pendulum Mechanism
Hideo Sato,Kuniaki Kawabata,Tsuyoshi Suzuki,Hayato Kaetsu,Yasushi Hada,Yoshito Tobe 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
After the earthquake, it is very important to recognize the situation of the disaster area as soon as possible. Therefore, the objective of our research is to realize information gathering system applying wireless sensor network technology. This paper describes about development of a novel camera node for gathering the information and also experimental results by using the camera node via wireless multi-hop ad-hoc network. The wireless camera node consists of a small Linux embedded computer, a GPS adaptor, a CMOS camera with fish-eye lens and passive pendulum mechanism for maintain uniform posture of build-in camera passively. Thus, the wireless camera node can be set easily only to roll it up on the rough terrain. The developed node also can deliver gathered environmental information (video) to remote site by multi-hop transferring. It is experimented that the prototype can transfer the captured video information in the wireless ad-hoc network.
X-Band GaN HEMT Advanced Power Amplifier Unit for Compact Active Phased Array Antennas
Yuusuke Yamashita,Taihei Nakada,Tsuyoshi Kumamoto,Ryota Suzuki,Masahiro Tanabe 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A compact power amplifier unit for X-band solid-state Active Phased Array Antennas (APAAs) has been developed. Its major features are, (1) high power GaN (Gallium Nitride) HEMT is employed, (2)16 transmit MICmodules are arrayed in line on a thin flat printed wiring board (PWB), (3) output power is 30W (pulse) at eachtransmit-output port of the unit, hence 480 W in total, and (4) other necessary functions for phased array antennas, such as digital phase-shifters and RF dividers, are all included in this PWB. Resulting electrical measured data are presented in detail in the paper, proving that further power and frequency range increase for APAAs would become feasible by the concepts employed in this unit design.