Zobrazeno 1 - 10
of 125
pro vyhledávání: '"K. Upendra Kumar"'
Autor:
Kummara Venkata Krishnaiah, P. Venkatalakshmamma, K. Upendra Kumar, P. Haritha, V. Lavin, I.R. Martin, N. Ravi, H. Satish Kumar Reddy, V. Venkatramu, Nanda Kumar Reddy Nallabala, C. Yuvaraj
Publikováno v:
Ceramics International.
Akademický článek
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Akademický článek
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Autor:
Courtney Kucera, K. Upendra Kumar, Carlos Jacinto, John Ballato, Luiz G. Jacobsohn, Karn Serivalsatit, Steven A. Roberts, M. V. D. Vermelho, P.Y. Poma
Publikováno v:
Journal of Luminescence. 161:306-312
Transparent Y 2 O 3 ceramics singly-doped with either Eu 3+ or Tm 3+ were fabricated by means of sequential consolidation steps at high pressure and temperature. These ceramics were characterized for their luminescence and thermal lensing behaviors,
Autor:
R. Rajeswari, K. Venkata Krishnaiah, S. Surendra Babu, K. Upendra Kumar, Inocencio R. Martín, C.K. Jayasankar
Publikováno v:
Journal of Quantitative Spectroscopy and Radiative Transfer. 140:37-47
This paper reports ytterbium-doped lead phosphate (PbPhYb) glasses made by melt-quenching technique and their linear and nonlinear refractive indices. Raman and FTIR spectral analysis has been carried out to investigate the functional groups that con
Publikováno v:
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 113:145-153
Dysprosium (Dy 3+ ) ions doped zinc fluorophosphate (PKAZLFDy: P 2 O 5 –K 2 O–Al 2 O 3 –ZnF 2 –LiF–Dy 2 O 3 ) glasses have been prepared and investigated their spectroscopic properties using absorption, emission and decay measurements. Judd
Publikováno v:
Optical Materials. 35:102-107
Ho3+-doped lead phosphate (P2O5 + K2O + Al2O3 + PbO + Na2O + Ho2O3) glasses have been prepared by conventional melt quenching technique. The optical properties have been characterized through absorption, emission and gain spectra and decay rate analy
Publikováno v:
Materials Express. 2:294-302
Publikováno v:
Journal of Experimental Nanoscience. 9:639-651
Stable silver decahedron nanoparticles were produced under the blue light irradiation (light-emitting diodes) of a modified precursor solution that has been previously reported. To improve the formation of the nano-decahedrons under blue light, we pr
Autor:
K. Venkata Krishnaiah, C.K. Jayasankar, C. G. Murali, Shivanand Chaurasia, Víctor Lavín, K. Upendra Kumar, Vivechana Agarwal, L. J. Dhareshwar
Publikováno v:
Physics Procedia. 29:109-113
The concentration dependent Yb 3+ : phosphate (P2O5 + K2O + MgO + Al2O3 + Yb2O3) glasses have been prepared and characterized their fluorescence and laser properties. The stimulated emission cross-section and laser performance parameters were determi