Browsing by Author "L. Prasad"

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Measurement of intensity of directionally diffuse streaks on a four-circle diffractometer: divergence correction factors for bisecting setting
(Wiley-Blackwell, 1987) D. Pandey; L. Prasad; S. Lele; J.P. Gauthier
Because of the inherent beam divergence, point intensities measured using a four-circle diffractometer at equispaced points along the diffuse streak correspond to variable lengths of the streak. Correction factors required to convert the measured intensities into those corresponding to a fixed length at each equispaced point along the diffuse streak are derived for two different crystal mountings under bisecting geometry. A procedure for experimentally verifying the mathematical approach employed in these calculations is also described. © 1987, Wiley-Blackwell. All rights reserved.
On coronal loop heating by torsional Alfvén waves
(2001) U. Narain; P. Agarwal; R.K. Sharma; L. Prasad; B.N. Dwivedi
Heating of coronal loops by linear resonant Alfvén waves, excited by the footpoints motions in the photosphere, has been studied. The analysis of single-layer heating is extended to multilayer heating, in semiempirical treatment. Heating and nonthermal velocities in different layers of loops in X-ray bright points, active regions, and large-scale structures are estimated. The average value of velocity is found to be in agreement with the observations.
Partial resistance components for the management of spot blotch pathogen Bipolaris sorokiniana of barley (Hordeum vulgare L.)
(2011) B. Bashyal; Ramesh Chand; L. Prasad; A. Joshi
Eighty barley genotypes were evaluated for partial resistance components of spot blotch disease of barley caused by Bipolaris sorokiniana under field conditions. Barley genotypes were inoculated with 29 B isolate of Bipolaris sorokiniana and the Area Under Disease Progress Curve (AUDPC), size of lesion, number of lesions leaf-1 and number of spores lesion-1 were recorded for penultimate leaves. A wide range of variation was observed for the components of partial resistance in barley genotypes. AUDPC and size of lesion identified as first principal components for the resistance. Further cluster analysis clustered genotypes into 10 groups and barley genotypes BCU5592, BCU5613, BCU1452, BCU138 and BCU133 exhibited low AUDPC, smaller lesion size, less number of lesions leaf-1 and less number of spores lesion-1. Selecting these genotypes exhibiting resistant components could be helpful in reducing losses caused by disease and thus contribute to increased yield.