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M. Ramaprakash,R. Nivethida,A. Muthukrishnan,A. Jerom Samraj,M. G. Neelavannan,N. Rajasekaran The Korean Electrochemical Society 2023 Journal of electrochemical science and technology Vol.14 No.4
Ni-W/Al<sub>2</sub>O<sub>3</sub> nano-composites were electrodeposited on mild steel substrate for mechanical and corrosion resistance applications. This study focused on the preparation of Ni-W/Al<sub>2</sub>O<sub>3</sub> nano-composite coating with various quantity of Al<sub>2</sub>O<sub>3</sub> incorporations. The addition of Al<sub>2</sub>O<sub>3</sub> in the electrolytes were varied from 1-10 g/L in electrolytes and the Al<sub>2</sub>O<sub>3</sub> incorporation in Ni-W/Al<sub>2</sub>O<sub>3</sub> nano-composite coatings were obtained from 1.82 to 13.86 wt.%. The incorporation of Al<sub>2</sub>O<sub>3</sub> in Ni-W alloy matrix influenced the grain size, surface morphology and structural properties were observed. The distributions of Al<sub>2</sub>O<sub>3</sub> particle in alloy matrix were confirmed using electron microscopy (FESEM and TEM) and EDAX mapping analysis. The crystal structure informations were studied using X-ray diffraction method and it confirms that the deposits having cubic crystal structure. The better corrosion rate (0.87 mpy) and microhardness (965 HV) properties were obtained for the Ni-W/Al<sub>2</sub>O<sub>3</sub> nano-composite coating with 13.86 wt.% of Al<sub>2</sub>O<sub>3</sub> incorporations.
DEVELOPMENT STATUS OF THE DOTIFS DATA SIMULATOR AND THE REDUCTION PACKAGE
CHUNG, HAEUN,RAMAPRAKASH, A.N.,PARK, CHANGBOM The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
A data simulator and reduction package for the Devasthal Optical Telescope Integral Field Spectrograph (DOTIFS) has been developed. Since data reduction for the Integral Field Spectrograph (IFS) requires complicated procedures due to the complex nature of the integral spectrograph, common reduction procedures are usually not directly applicable for such an instrument. Therefore, the development of an optimized package for the DOTIFS is required. The data simulator observes artificial object and simulates CCD images for the instrument considering various effects; e.g. atmosphere, sky background, transmission, spectrograph optics aberration, and detector noise. The data reduction package has been developed based on the outcomes from the DOTIFS data simulator. The reduction package includes the entire processes for the reduction; pre-processing, flat-fielding, and sky subtraction. It generates 3D data cubes as a final product, which users can use for science directly.
Magnetic fields in cometary globules – IV. LBN 437
Soam, A.,Maheswar, G.,Bhatt, H. C.,Lee, C. W.,Ramaprakash, A. N. Oxford University Press 2013 Monthly notices of the Royal Astronomical Society Vol.432 No.2
<P>We present results of our R-band polarimetry of a cometary globule, LBN 437 (Gal 96-15, l = 96 degrees, b = -15 degrees), to study the magnetic field geometry of the cloud. We estimated a distance of 360 +/- 65 pc to LBN 437 (also one additional cloud, CB 238) using a near-IR photometric method. The foreground contribution to the observed polarization values was subtracted by making polarimetric observations of stars that are located in the direction of the cloud and with known distances from the Hipparcos parallax measurements. The magnetic field geometry of LBN 437 is found to follow the curved shape of the globule head. This could be due to the drag that the magnetic field lines could have experienced because of the ionization radiation from the same exciting source that caused the cometary shape of the cloud. The orientation of the outflow from the Herbig A4e star, LkH alpha 233 (or V375 Lac), located at the head of LBN 437, is found to be parallel to both the initial (prior to the ionizing source was turned on) ambient magnetic field (inferred from a star HD 214243 located just in front of the cloud) and the Galactic plane.</P>