NOPR Collection:

Refractive indices of binary liquid mixtures of squalane with benzene, cyclohexane and hexane at 298.15 to 313.15 K

2001-12-01T00:00:00Z

Title: Refractive indices of binary liquid mixtures of squalane with benzene, cyclohexane and hexane at 298.15 to 313.15 K Authors: Bhatia, Subhash C; Tripathi, Neelima; Dubey, Gyan P Abstract: Densities, ρ, at 298.15 K and refractive indices, n, at 298.15, 303.15, 308.15 and 313.15 K have been measured for the binary liquid mixtures of squalane with benzene, cyclohexane and hexane over the whole mole fraction range. From refractive index data, the refractive index deviations, Δn, at different temperatures have been calculated and fitted to the Redlich-Kister polynomial equation to estimate the adjustable parameters and the standard deviations. Further, theoretical prediction of refractive indices of these binary liquid mixtures at 298.15 K have been made using various mixing rules. Results obtained have been discussed in terms of average percentage deviations. Page(s): 776-780

Spectral and normal coordinate analysis of 5,6-diamino uracil

2001-12-01T00:00:00Z

Title: Spectral and normal coordinate analysis of 5,6-diamino uracil Authors: Krishnakumar, V; Ramasamy, R Abstract: The FTIR spectrum of 5,6-diamino uracil has been recorded in the region 4000-100 cm^-1 and the normal coordinate analysis has been carried out by assuring a C_S point group symmetry. All the normal modes of vibrations are assigned and calculations on the potential energy distribution are performed. Page(s): 829-832

Bioluminescence of fireflies and evaluation of firefly pulses in light of oscillatory chemical reactions

2001-12-01T00:00:00Z

Title: Bioluminescence of fireflies and evaluation of firefly pulses in light of oscillatory chemical reactions Authors: Saikia, J; Changmai, R; Baruah, G D Abstract: The bioluminescence spectra of few species fireflies [species: Photinus pyralis, coleoptera: Lampyridae: Phengodes lacticollis, lampryridae and Photuris pennsylvanica, Lampyridae] have been photographed in the wavelength range 5000-6700 Å. The intensity distributions of the spectra have been investigated. The scanning of the individual firefly pulses have been recorded and it is shown that the intensity pattern of the pulses exhibit the oscillatory behaviour in chemical reaction inside the metabolism of firefly. The nature of relaxation oscillation is also examined in the firefly emission. Page(s): 825-828

Measurement of mass and linear attenuation coefficients of gamma rays for various elements through aqueous solution of salts

2001-12-01T00:00:00Z

Title: Measurement of mass and linear attenuation coefficients of gamma rays for various elements through aqueous solution of salts Authors: Teli, M T; Mahajan, C S; Nathuram, R Abstract: Solution technique is developed for the measurement of linear and mass attenuation coefficients of salts for gamma-rays and from them elemental attenuation coefficients are estimated. Improved mixture rule (Radiat Phys & chem, 53 (1998) 593), is employed for the measurement for salts containing carbonates, sulphates and chlorides etc. for various Gamma energies Mass attenuation coefficients for many elements are estimated. Their results show excellent agreement with theory. Page(s): 816-824