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Your search keyword '"Ganesamoorthy, S"' showing total 194 results
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13. Structural, optical and mechanical properties of Cr doped β-Ga2O3 single crystals.

Author

Vijayakumar, P., Ganesan, K., Sarguna, R. M., Amaladass, Edward Prabu, Suganya, M., Ramaseshan, R., Sen, Sujoy, Ganesamoorthy, S., and Ramasamy, P.

Subjects
SINGLE crystals, CRYSTAL growth, RAMAN spectroscopy, LIGHT absorption, ULTRAVIOLET-visible spectroscopy
Abstract

Undoped and Cr doped β-Ga2O3 (100) single crystals are grown by optical floating zone method. The full width at half maximum of rocking curve is found to be 106 arc.sec for undoped β-Ga2O3 crystals whereas the 100 and 200 ppm of Cr doped β-Ga2O3 crystals display multiple rocking curves with large peak widths indicating the presence of structural defects. Raman measurements reveal broadening in the vibrational mode of ~ 350 cm− 1 with a shoulder peak indicating the Cr3+ dopants preferentially substitute for Ga3+ at the octahedral sites. Further, the Cr doped β-Ga2O3 crystals display strong optical absorption bands about 420 and 597 nm in the UV-Vis spectroscopy. Moreover, the observation of sharp characteristic photoluminescence emission lines at 690 and 697 nm also confirms the Cr substitution in the doped crystals. The indentation hardness increases nearly linear from 13.0 ± 0.6 to 17.9 ± 0.4 GPa whilst the indentation modulus decreases from 224.9 ± 21.4 to 202.4 ± 11.9 GPa upon Cr doping of 200 ppm in β-Ga2O3. The structural defects caused by the Cr doping interrupt the movement of indentation induced dislocations that results in the increase of hardness of the Cr doped β-Ga2O3 (100) single crystals. [ABSTRACT FROM AUTHOR]

Published
2024
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24. Attracting and Retaining of Youth in Agriculture (ARYA) Project Paves Way to Livelihood Security of Youth.

Author

RAJESH, C. M., SURESHA, S. V., RAGHUPRASAD, K. P., and GANESAMOORTHY, S.

Subjects
SUSTAINABLE agriculture, JOB vacancies, SOCIOECONOMIC status, AGRICULTURE, RESEARCH personnel
Abstract

Owing to the importance of youth power in agriculture, ICAR came out with a policy plan to enhance the production ability, reliability and sustainability of youths in agriculture through 'Attracting and Retaining of Youth in Agriculture' (ARYA) project in the year 2015-16. In the ARYA project, the youths below 35 years of age are trained with the twin objective of empowering the younger generation in terms of their livelihood, income and socio-economic status and to attracting the youths to take up agriculture as a main source of income. The study was conducted in the Shivamogga district of Karnataka in 2023, focusing on the beneficiaries of the ARYA project. The Krishi Vigyan Kendra (KVK), Shivamogga maintained the follow-up list of these beneficiaries. Data collection was carried out personally by the researcher using a pretested interview schedule. The study involved interviewing 60 beneficiary youths who were part of the ARYA project in Shivamogga district. It was found that 46.67 per cent of the respondents belongs to average level of livelihood security. Additionally, nearly one-third (31.66%) of the respondents enjoy better livelihood security, while the remaining respondents (21.67%) fall into the category of poor livelihood security. These improvements in livelihood security can be largely attributed to the enhancement of socio-economic status, entrepreneurial behavior, skill sets and employment opportunities facilitated by the ARYA project. The study assessed these outcomes by examining the changes observed, which included a significant decrease in dependency on informal credit sources, reduced migratory needs and an increase in employment opportunities within the village. These findings signify the remarkable progress achieved through the implementation of the ARYA project. [ABSTRACT FROM AUTHOR]

Published
2024

43. Raman and Photoluminescence Spectroscopic Studies on Structural Disorder in Oxygen Deficient Gd2Ti2O7‐δ Single Crystals.

Author

Suganya, M., Ganesan, K., Vijayakumar, P., Gill, Amirdha Sher, Srivastava, S. K., Singh, Ch. Kishan, Sarguna, R. M., Ajikumar, P. K., and Ganesamoorthy, S.

Abstract

Raman and photoluminescence spectroscopic studies on oxygen vacancy‐induced structural disorder in Gd2Ti2O7‐δ single crystals grown by optical floating zone technique under argon atmosphere are reported. The oxygen vacancies in Gd2Ti2O7‐δ wafers decrease with thermal annealing in air atmosphere. The full width at half maximum of X‐ray diffraction rocking curve decreases from 245 to 157 arcsec and the optical transmittance increases from 23% to 87% (at 1000 nm) upon post growth thermal annealing. Raman spectroscopic studies reveal a monotonic increase in intensity of O–Gd–O (Eg) and Ti–O (A1g) stretching modes with thermal annealing. Since these modes are associated with modulation of oxygen x parameter which is sensitive to Ti–O octahedron distortion, the increase in Raman intensity indicates an improvement in structural ordering of oxygen sub‐lattice in Gd2Ti2O7‐δ. Moreover, the photoluminescence studies also corroborate the Raman analysis in terms of reduction of structural defects associated with oxygen vacancies as a function of thermal annealing. This study demonstrates the effectiveness of using Raman spectroscopy to probe the structural disorder in Gd2Ti2O7‐δ crystals. [ABSTRACT FROM AUTHOR]

Published
2022
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