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POSITIONAL COINCIDENCE BETWEEN WATER MASERS AND A PLASMA TORUS IN NGC 1052
SAWADA-SATOH SATOKO,KAMENO SEIJI,SHIBATA KATSUNORI M.,INOUE MAKOTO The Korean Astronomical Society 2005 Journal of The Korean Astronomical Society Vol.38 No.2
We present results of the VLBA observation toward the radio continuum and water maser emissions in a nearby LINER galaxy NGC 1052. The jet structure observed in 2000 is similar to that in 1998, and the two jet structures in 1998 and 2000 support the sub-luminal motion with apparent velocity of 0.26c. Distribution of water maser spots are located ${\~}$0.05 pc shifted to southwest from the component which is supported to be the nucleus, and no rapid positional change of the water maser gas with respect to the central engine is seen from 1995 to 2000. The maser gas is positionally coincident with a plasma torus, and the position of the maser gas relative to the nucleus is stable from 1995 to 2000. The maser gas in NGC 1052 could be explained to be associated with the nuclear circumnuclear torus or disk like the situation found in the nucleus of NGC 4258.
Stress Corrosion Cracking of Annealed Carbon Steel in Aqueous Bicarbonate Solution
Haruna, Takumi,Zhu, Liehong,Murakami, Makoto,Shibata, Toshio 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.4
Effects of potential and concentration of bicarbonate on stress corrosion cracking (SCC) of annealed SM400B carbon steel has been investigated in bicarbonate solutions at 343 K. A potentiostatic slow strain rate testing apparatus equipped with a charge coupled device camera system was employed to evaluate SCC susceptibility from the viewpoint of the crack initiation as well as propagation. Surface of the specimen annealed at more than 1073 K for 3.6 ks had decarburized layer of about 500 ㎛ thickness, and suffered SCC in bicarbonate solutions. In 1 M bicarbonate solution, a lot of cracks were observed in the potential range from -800 to 600㎷_(Ag/AgCl-). In the range, both initiation and propagation of the cracks were most accelerated at -600㎷_(Ag/AgCl-). While, under a constant applied potential of -600㎷, many cracks were observed in the concentration range from 0.001 to 1 M, and both initiation and propagation of the cracks were suppressed as the oncentration decreased. Polarization curves for the decarburized specimen were measured by two different scan rates. The potential showing larger difference between the current densities measured at the two scan rates predicts that of high susceptibility of SCC initiation. It was found that the potential where large difference between the current densities was -600㎷_(Ag/AgCl-) for 1M bicarbonate solution, and increased with decrease in the concentration. This suggests that the applied potential of -600㎷_(Ag/AgCl-) provides high SCC susceptibility for 1 M bicarbonate solution, and decrease in the concentration reduces the SCC susceptibility at -600㎷_(Ag/AgCl-). These predictions was in good agreement with the empirical SCC results depending on the potential as well as the concentration.