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Time Resolved Measurement of Electric Field Distribution in a Liquid Dielectric
Arii, Kiyomitsu,Ihori, Haruo,Fujii, Masaharu The Korean Institute of Electrical Engineers 2002 KIEE International Transactions on Electrophysics Vol.c2 No.6
Measurement technique of three dimensional electric field distribution in liquid dielectrics have been studied. Kerr effect and computed tomography(CT) method have been used. Measuring time has been shortened by the use of multi-optical systems to less than several milliseconds. Near future, electric field distribution in front of a streamer tip of breakdown would be measured.
A Dual-mode Pico-positioning System using Active Aerostatic Coupling
Mizumoto, Hiroshi,Yabuta, Yoshito,Arii, Shiro,Yabuya, Makoto,Tazoe, Yoichi Korean Society for Precision Engineering 2007 International Journal of Precision Engineering and Vol.8 No.2
This paper proposes a dual-mode ultra precision positioning system for machine tools and measuring machines. The objective was to position a machine table with a picometer order of resolution, i.e., pico-positioning. A twist-roller friction drive (TFD) was used in coarse-mode positioning. The TFD, which was driven by an AC servomotor, is a kind of lead screw in mechanical terms, and several centimeters of machine table movement was controlled with a nanometer order of positioning resolution. To eliminate lateral vibration caused by the TFD, an active aerostatic coupling driven by piezoelectric actuators was inserted between the TFD and the machine table. This active aerostatic coupling was also applied as a feed drive device for fine-mode positioning; in the fine mode, the positioning resolution was 50 pm. Factors influencing pico-positioning, such as how noise from displacement sensors and vibrations in the aerostatic guideway affect positioning resolution, are discussed.
Sen-Ich Oda,이계주,Tatsuo Arii,Keiji Imoto,현병화,박인성,김현,유임주 대한해부학회 2010 Anatomy & Cell Biology Vol.43 No.3
Voltage dependent calcium channels (VDCC) participate in regulation of neuronal Ca2+. The Rolling mouse Nagoya (Cacna1atg-rol) is a spontaneous P/Q type VDCC mutant, which has been suggested as an animal model for some human neurological diseases such as autosomal dominant cerebellar ataxia (SCA6), familial hemiplegic migraine and episodic ataxia type-2. Morphology of Purkinje cell (PC) dendritic spine is suggested to be regulated by signal molecules such as Ca2+ and by interactions with afferent inputs. The amplitude of excitatory postsynaptic current was decreased in parallel fiber (PF) to PC synapses, whereas apparently increased in climbing fiber (CF) to PC synapses in rolling mice Nagoya. We have studied synaptic morphology changes in cerebella of this mutant strain. We previously found altered synapses between PF varicosity and PC dendritic spines. To study dendritic spine plasticity of PC in the condition of insufficient P/Q type VDCC function, we used high voltage electron microscopy (HVEM). We measured the density and length of PC dendritic spines at tertiary braches. We observed statistically a significant decrease in spine density as well as shorter spine length in rolling mice compared to wild type mice at tertiary dendritic braches. In proximal PC dendrites, however, there were more numerous dendritic spines in rolling mice Nagoya. The differential regulation of rolling PC spines at tertiary and proximal dendrites in rolling mice Nagoya suggests that two major excitatory afferent systems may be regulated reciprocally in the cerebellum of rolling mouse Nagoya.
A Dual-mode Pico-positioning System using Active Aerostatic Coupling
Hiroshi Mizumoto,Yoshito Yabuta,Shiro Arii,Makoto Yabuya,Yoichi Tazoe 한국정밀공학회 2007 International Journal of Precision Engineering and Vol.8 No.2
This paper proposes a dual-mode ultraprecision positioning system for machine tools and measuring machines. The objective was to position a machine table with a picometer order of resolution, i.e., pico-positioning. A twistroller friction drive (TFD) was used in coarse-mode positioning. The TFD, which was driven by an AC servomotor, is a kind of lead screw in mechanical terms, and several centimeters of machine table movement was controlled with a nanometer order of positioning resolution. To eliminate lateral vibration caused by the TFD, an active aerostatic coupling driven by piezoelectric actuators was inserted between the TFD and the machine table. This active aerostatic coupling was also applied as a feed drive device for fine-mode positioning; in the fine mode, the positioning resolution was 50 pm. Factors influencing pico-positioning, such as how noise from displacement sensors and vibrations in the aerostatic guideway affect positioning resolution, are discussed.