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Anitha, B.
- Studies on the Growth and Characterization of Organic L-Arginine Semicarbazone Dihydrate NLO Single Crystal
Authors
1 Department of Physics, SRR Engineering College, Chennai, Tamil Nadu, IN
2 Department of Chemistry, SRR Engineering College, Chennai, Tamil Nadu, IN
3 Department of Physics, Sathyabama University, Chennai, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 7, No 7 (2014), Pagination: 1014-1017Abstract
This paper reports an organic crystal of a New Nonlinear Optical (NLO) material, L-Arginine Semicarbazone dihydrate (abbreviated as LASC). The crystals were grown by slow evaporation from an aqueous solution and crystallize in monoclinic form which is confirmed by single crystal x-ray diffraction analysis. The molecular weight of the grown crystal was estimated by mass spectrometry. The FTIR spectra con-firm the presence of the functional groups in the crystal while The UV-vis-NIR spectrum of grown crystal LASC reveals its transparent nature. The optical absorption in the grown crystal is almost negligible in the UV and visible spectral regions with the lower cut off wavelength at around 350 nm. Minimum amount of optical absorption suggests that the LASC crystal is highly transparent in the UV-visible spectral region and is useful for nonlinear optical applications. The second harmonic generation is confirmed by the emission of green light and its efficiency is found to be 0.51 times that of KDP crystal. The photoconductivity study shows that the grown crystal exhibit negative photoconductivity. Primary studies show that the grown crystals are appropriate for optoelectronics applications and Second Harmonic Generations.Keywords
FTIR, NLO, Optical Absorption, Photoconductivity Study, Solution GrowthFull Text
- A Lossless Approach for Data Hiding using LZW Codes
Authors
1 Department of Information Technology, Kongu Engineering College, Perundurai, 638052, IN
Source
Digital Image Processing, Vol 7, No 10 (2015), Pagination: 312-316Abstract
Hiding a message in compression codes can reduce transmission costs and simultaneously make the transmission more secure. In high-performance, data-hiding Lempel–Ziv–Welch (HPDH-LZW) scheme, which reversibly embeds data in LZW compression codes by modifying the value of the compression codes, where the value of the LZW code either remains unchanged or is changed to the original value of the LZW code plus the LZW dictionary size according to the data to be embedded. According to the embedding bits, the original value of LZW code is modified. Reversible data hiding scheme is used in compression domain where compression code is altered to hide the data. Compared to other information-hiding schemes based on LZW compression codes, the proposed scheme achieves better hiding capacity by increasing the number of symbols available to hide secrets and also achieves faster hiding and extracting speeds due to the lower computation requirements.
Keywords
LZW, Steganography, Information Hiding.
- Computational Study on Ion Dynamics of Mems Quadrupole Mass Filter
Authors
1 MEMS Development Division, Laboratory for Electro-Optics Systems (LEOS), ISRO, Bangalore, IN