http://nopr.niscair.res.in/handle/123456789/6871 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/10628 Title: Thermal analysis of slow wave structure for a space helix travelling wave tube <br/> <br/>Authors: Alaria, Mukesh Kumar; Sunny; Sinha, A K; Srivastava, V <br/> <br/>Abstract: Thermal analysis of the slow-wave structure for Ku-band 140 W helix space traveling wave tube (TWT) has been carried out using ANSYS software v.10.1. To evaluate the thermal aspects of the helix slow-wave structure with three APBN support rods and barrel assembly, the related studies of the slow-wave structure assembly with six, ten and sixteen turns of helix for the Ku-band 140 W space TWT during extreme case of operation, i.e. at saturation and with perfectly rigid base-plate at 80°C have been carried out. The CPU time on Pentium-4, window XP system with 512 MB RAM is 45 min for six turns, one hour for ten turns and one hour 45 min for sixteen turns of helix. The objective of this analysis is reduced the solution time and to get the same result with higher turns of helix <br/> <br/>Page(s): 904-907 http://nopr.niscair.res.in/handle/123456789/10627 Title: Enhancement of transmittance of indium tin oxide coated glass plates <br/> <br/>Authors: Basu, A; Naqvi, Mohsin M; Chakraborty, T K <br/> <br/>Abstract: The transmittance of a glass plate with a transparent conducting coating of a material like indium tin oxide (ITO) can be enhanced by depositing a thin film of a material like silicon dioxide (whose thickness need not be tightly controlled) on top of the transparent conducting coating, avoiding the necessity of designing and depositing a complex multilayer antireflection coating on the opposite surface of the glass plate. The theory behind this performance of the silicon dioxide film and some actual experimental results have been reported. <br/> <br/>Page(s): 899-903 http://nopr.niscair.res.in/handle/123456789/10626 Title: Thermodynamical variations and stability of a binary Bose-Fermi system <br/> <br/>Authors: Ayodo, Y K; Khanna, K M; Sakwa, W T <br/> <br/>Abstract: The low-temperature thermodynamic variables of entropy, internal energy and specific heat capacity of a liquid ³He-⁴He binary system have been studied. The system showed a remarkable discontinuity in internal energy at about 2.14 K. In the binary mixtures, the bosonic components have been studied by means of modified Gross-Pitaevskii (GP) approximations and the fermionic components by Thomas-Fermi (TF) approximations. Equations for particle and energy distributions have been developed. The effects of the nature of scattering lengths have been studied. Implications on selected Bose-Fermi mixtures such as ⁷Li-⁶Li and ⁴¹K-⁴⁰K are discussed. <br/> <br/>Page(s): 886-892 http://nopr.niscair.res.in/handle/123456789/10625 Title: Noise emissions of transit trains at curvature due to track lubrication <br/> <br/>Authors: Garg, Naveen; Sharma, Omkar <br/> <br/>Abstract: The flanging and squealing noise generated by transit metro trains while crossing a curvature path has been studied. The noise emission at curvature is analyzed in case of non lubricated and lubricated track for wayside and interior of the train. The gauge face lubrication does not have a significant effect on the A-weighted noise generated by the train transit system while passing through a curved track. The negation of lubrication effect in controlling the overall A-weighted noise emission is attributed to an additional reaction force component, which accentuates the wheel/rail interaction comparatively more than the reduced high frequency squeal and flanging noise for the lubricated track. This additional force component is generated due to longitudinal and spin creepage on the flange while encountering a curved track and is observed to cause an increase in noise emission in the frequency range 250-400 Hz, where the rail/wheel interaction is dominant; in both way side as well as interior noise levels. <br/> <br/>Page(s): 881-885