We estimate the enclosed mass profile in the central 10 pc of the Milky Way by analyzing the infrared photometry and the velocity observations of dynamically relaxed stellar population in the Galactic center. HST/NICMOS and Gemini Adaptive Optics images in the archive are used to obtain the number density profile, and proper motion and radial velocity data were compiled from the literature to find the velocity dispersion profile assuming a spherical symmetry and velocity isotropy. From these data, we calculate the the enclosed mass and density profiles in the central 10 pc of the Galaxy using the Jeans equation. Our improved estimates can better describe the exact evolution of the molecular clouds and star clusters falling down to the Galactic center, and constrain the star formation history of the inner part of the Galaxy.

The effects of post-CMP cleaning on the chemical and galvanic corrosion of copper (Cu) and titanium(Ti) were studied in patterned silicon (Si) wafers. First, variation of the corrosion rate was investigated as afunction of the concentration of citric acid that was included in both the CMP slurry and the post-CMP solution.The open circuit potential (OCP) of Cu decreased as the citric acid concentration increased. In contrast withCu, the OCP of titanium (Ti) increased as this concentration increased. The gap in the OCP between Cu andTi increased as citric acid concentration increased, which increased the galvanic corrosion rate between Cu andTi. The corrosion rates of Cu showed a linear relationship with the concentrations of citric acid. Second, theeffect of Triton X-100®, a nonionic surfactant, in a post-CMP solution on the electrochemical characteristics ofthe specimens was also investigated. The OCP of Cu decreased as the surfactant concentration increased. Incontrast with Cu, the OCP of Ti increased greatly as this concentration increased. Given that Triton X-100®changes its micelle structure according to its concentration in the solution, the corrosion rate of eachconcentration was tested.

In this paper, non-treated ACF (Activated Carbon Fiber) /TiO2 and Zn-treated ACF/TiO2 were prepared. The prepared composites were characterized in terms of their structural crystallinity, elemental identification and photocatalytic activity. XRD patterns of the composites showed that the non-treated ACF/TiO2 composite contained only typical single and clear anatase forms while the Zn-treated ACF/TiO2 contained a mixed anatase and rutile phase with a unique ZnO peak. SEM results show that the titanium complex particles are uniformly distributed on and around the fiber and that the titanium complex particles are more regularly distributed on and around the ACF surfaces upon an increase of the ZnCl2 concentration. These EDX spectra show the presence of peaks from the C, O and Ti elements. Moreover, peaks of the Zn element were observed in the Zn-treated ACF/TiO2 composites. The prominent photocatalytic activity of the Zn-treated ACF/TiO2 can be attributed to the three different effects of photo-degradation: doping, absorptivity by an electron transfer, and adsorptivity of porous ACFs between the Zn-TiO2 and Zn-ACF.