N C Shivaprakash
Articles written in Pramana – Journal of Physics
Volume 19 Issue 4 October 1982 pp 349-355 Liquids
Srinivasa M M M Abdoh N C Shivaprakash J Shashi-Dhara Prasad
The refractive indices and densities of three members of trans-4-propyl cyclohexyl-4 (trans-4-alkyl cyclohexyl) benzoates are reported as functions of temperature in the nematic and isotropic phases. The principal molecular polarizabilities and order parameters (
Volume 55 Issue 3 September 2000 pp 441-446 Research Articles
Crystal and molecular structure of N-(
K V Rajuna Gowda M K Kokila Puttaraja M V Kulkarni N C Shivaprakash
The crystal structure of N-(
Volume 88 Issue 3 March 2017 Article ID 0041 Research Article
SETTU BALACHANDAR N C SHIVAPRAKASH L KAMESWARA RAO
A conceptually new approach is proposed to estimate the thermal diffusivity of optically transparent solids at ambient temperature based on the ‘position-dependent instantaneous velocity’ of isothermal surfaces using a self-reference interferometer. A new analytical model is proposed using the exact solution to relate the instantaneous velocity of isothermal surfaces with the thermal diffusivity of solids. The experiment involves setting up a one-dimensional non-stationary heat flow inside the solid via step-temperature excitation to launch a spectrum of dissimilar ‘moving isothermal surfaces’ at the origin. Moving isothermal surfaces exhibit macroscale ‘rectilinear translatory motion’; the instantaneous velocity of any isothermal surface at any location in the heat affected region is unique and governed by the thermal diffusivity of the solids. The intensity pattern produced by the self-reference interferometer encodes the moving isothermal surfaces into the corresponding moving intensity points. The instantaneous velocities of the intensity points are measured. For a given thermo-optic coefficient, the corresponding values of the isothermal surfaces are predicted to estimate the thermal diffusivity of the solids using BK7 glass as an example. Another improved method is proposed in which thermal diffusivity is estimated without measuring thermo-optic coefficient and quartz glass is utilized as a specimen. The results obtained using the proposed approaches closely match with the literature value.
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