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MHD SIMULATIONS OF A MOVING SUB CLUMP WITH HEAT CONDUCTION
ASAI NAOKI,FUKUDA NAOYA,MATSUMOTO RYOJI The Korean Astronomical Society 2004 Journal of The Korean Astronomical Society Vol.37 No.5
High resolution observations of cluster of galaxies by Chandra have revealed the existence of an X-ray emitting comet-like galaxy C153 in the core of cluster of galaxies A2125. The galaxy C153 moving fast in the cluster core has a distinct X-ray tail on one side, obviously due to ram pressure stripping, since the galaxy C153 crossed the central region of A2125. The X-ray emitting plasma in the tail is substantially cooler than the ambient plasma. We present results of two-dimensional magnetohydrodynamic simulations of the time evolution of a sub clump like C153 moving in magnetized intergalactic matter. Anisotropic heat conduction is included. We found that the magnetic fields are essential for the existence of the cool X-ray tail, because in non-magnetized plasma the cooler sub clump tail is heated up by isotropic heat conduction from the hot ambient plasma and does not form such a comet-like tail.
Analog MOS Curcuits for Motion Detection and Object Tracking Based on Biological Systems
YONEZU, Hiroo,ASAI, Tetsuya,OHTANI, Masahiro,OHSHIMA, Naoki 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
We propose simple analog MOS circuits with a correlation model based on the insect motion detectors aiming at the realization of fundamental motion-sensing systems. The model makes the circuit structure quite simple, compared with conventional velocity sensing circuits. SPICE simulation results indicate that the proposed circuits compute local velocities of the moving light spot and have direction selectivity for the spot. The spot was tracked by compensating background images.