http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Venkata Krishnaiah, K. (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Prabhakar, J.,Kummara, Venkata Krishnaiah,Linganna, K.,Babu, P.,Jayasankar, C.K.,Kim, Jihoon,Venkatramu, V. Elsevier 2019 OPTIK -STUTTGART- Vol.176 No.-
<P><B>Abstract</B></P> <P>Trivalent dysprosium doped niobium zinc fluorosilicate glasses modified with different Nb<SUB>2</SUB>O<SUB>5</SUB>/ZnF<SUB>2</SUB> molar (M) ratios have been fabricated by the traditional melt-quenching technique and derived their structural, photoluminescence and decay properties using spectroscopic techniques. Induced structural modifications have been observed upon increasing content of Nb<SUB>2</SUB>O<SUB>5</SUB>. Maximum phonon energy of the glass matrix is found to be 1010 cm<SUP>−1</SUP> from the Raman spectrum. The emission spectra of these glasses exhibit two intense bands at 480 and 570 nm besides a weak red emission at 650 nm. The decay profiles of Dy<SUP>3+</SUP> ion for the <SUP>4</SUP>F<SUB>9/2</SUB> level exhibit a non-exponential behavior for all the glasses. The intrinsic lifetimes for the <SUP>4</SUP>F<SUB>9/2</SUB> level of Dy<SUP>3+</SUP> ion have been determined by using the Inokuti-Hirayama model and are found to be 409, 366 and 325μs for the glasses with Nb<SUB>2</SUB>O<SUB>5</SUB>/ZnF<SUB>2</SUB>:10/30, 20/20 and 30/10 M ratios, respectively. The color coordinates have been evaluated from the emission spectra of the glasses and found that the glass with Nb<SUB>2</SUB>O<SUB>5</SUB>/ZnF<SUB>2</SUB>:30/10 M ratio appears near to the equal energy point. The correlated color temperature matches well to the summer sunlight region (4900–5600 K), indicating that the glasses could be a potential candidate for white light emitting devices.</P>
-
Babu, P.,Martin, I.R.,Venkata Krishnaiah, K.,Seo, H.J.,Venkatramu, V.,Jayasankar, C.K.,Lavin, V. North Holland 2014 Chemical physics letters Vol.600 No.-
The Ho<SUP>3+</SUP>-Yb<SUP>3+</SUP> co-doped transparent glass and glass-ceramics containing CaF<SUB>2</SUB> nanocrystals have been prepared. Differential thermal analysis and X-ray diffraction measurements have been made to characterize thermal properties of glass and structural changes in glass-ceramics, respectively. Photon avalanche upconversion has been achieved by exciting the samples at 745nm at room temperature. An intense green and a weak red upconverted emissions corresponding to the <SUP>5</SUP>S<SUB>2</SUB>:<SUP>5</SUP>F<SUB>4</SUB>→<SUP>5</SUP>I<SUB>8</SUB> and <SUP>5</SUP>F<SUB>5</SUB>→<SUP>5</SUP>I<SUB>8</SUB> transitions, respectively, have been observed. The upconversion intensity has been found to increase with the increase in the size of the fluoride nanocrystals in glass-ceramics. Experimental evidences confirm that the mechanism of upconversion is photon avalanche.
-
G. Sankara Reddy,A. Subba Reddy,M. Venkata Subbaiah,K. Vasudha,A. Krishnaiah 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.6
Excess volumes, speeds of sound and viscosities at 303.15 K for the binary mixtures of diisopropyl ether (DIPE) + methyl acetate (MA) + ethyl acetate (EA) butyl acetate (BA) and + isoamyl acetate (IAA) were measured as a function of mole fraction over the entire range of composition. Insentropic compressibilities were computed from speed of sound and density data. Densities were obtained from experimental excess volume data. Speeds of sounds were evaluated using Jacobson free length theory and Schaaffs collision factor theory. The viscosity data were analyzed on the basis of corresponding states approach and Grunberg and Nissan treatment. The experimental results on excess volume, deviations in isentropic compressibility and in viscosity were discussed in terms of molecular interactions between unlike molecules. 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
