http://nopr.niscair.res.in/handle/123456789/2601 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/2632 Title: Acoustical behaviour of glycerine, dextrose and sucrose in Na₂CO₃ and NaHCO₃ buffer solution <br/> <br/>Authors: Kannappan, A N; Palani, R <br/> <br/>Abstract: The ultrasonic velocity, density and viscosity of glycerine, dextrose and sucrose in sodium carbonate (0.5 M) + sodium bicarbonate (0.5 M) buffer solutions at temperatures 303, 308 and 313 K have been measured. The derived acoustical and thermodynamic parameters namely, adiabatic compressibility, free length, specific acoustic impedance, free volume, internal pressure, molar cohesive energy, viscous relaxation time, Gibb’s free energy, relative association, available volume, molal hydration number and Lennard Jones potential have been calculated. The variations of these parameters with respect to the molarity and elevation of temperature have been explained on the basis of solute-solvent interaction and structure forming tendency of the solutes in the solvents. <br/> <br/>Page(s): 573-579 http://nopr.niscair.res.in/handle/123456789/2631 Title: High resolution electronic absorption spectrum of 1, 3, 5-trifluorobenzene <br/> <br/>Authors: Tiwari, R P; Thakur, S N; Singh, R A <br/> <br/>Abstract: The near ultraviolet electronic absorption spectrum of 1,3,5 trifluorobenzene has been photographed on a 10.6 m concave grating spectrograph. The electronic forbidden transition ¹A'₂ ← ¹A'₁ is explained as arising due to perturbation of the electronic state by non-totally symmetric vibration ν₆. Besides ν₆, the other modes of e' species ν₈, ν₉, ν₁₈, and ν₁₉ are also active and give rise to false origins. The vibrational frequencies for ν₉, ν₁₈, ν₁₉, ν₈, ν₁₃, ν₁ and ν₁₆ modes in the first electronic excited state ¹A'₂ are reported for the first time. <br/> <br/>Page(s): 569-572 http://nopr.niscair.res.in/handle/123456789/2630 Title: FTIR analysis of high energy heavy ion irradiated kapton-H polyimide <br/> <br/>Authors: Garg, Maneesha; Quamara, J K <br/> <br/>Abstract: FTIR spectroscopy technique has been applied for the analysis of high energy heavy ion irradiated kapton-H polyimide. The kapton-H samples were irradiated with 75 MeV oxygen, 80 MeV nickel and 50 MeV lithium ions at PELLETRON facility, Nuclear Science Centre, New Delhi. A very broad peak in 2500-3500 cm⁻¹ is due to the presence of absorbed water in irradiated samples. The reduction in the intensity of 1702 cm⁻¹ peak in irradiated samples as compared to pristine samples is associated to the demerization of carbonyl groups. The increase in the intensity of this peak with increase in fluence is due to the increase in cross-linked structure causing the reduction in demerization of carbonyl groups. The FTIR spectrum is independent of the nature of ion. <br/> <br/>Page(s): 563-568 http://nopr.niscair.res.in/handle/123456789/2629 Title: Photoelectric properties of CdS thin film prepared by chemical bath deposition <br/> <br/>Authors: Devi, R; Purkayastha, P; Kalita, P K; Sarma, R; Das, H L; Sarma, B K <br/> <br/>Abstract: Cadmium sulphide thin films deposited on glass substrates are found to be polycrystalline having hexagonal type structure. The photocurrent-light intensity characteristics show sub-linear and super-linear behaviour which are attributed to the defects. The defect characterization is done from the temperature dependence of dc photoconductivity and rise and decay characteristics of the photocurrent. shallow levels (0.06 to 0.34eV) arising from interstitial cadmium or sulphur vacancies are found to cause extrinsic photoconductivity near room temperature whereas the deep levels dominate the rise and decay characteristics and superlinearity. <br/> <br/>Page(s): 624-627