Deen Dayal Upadhyay Gorakhpur University

About: Deen Dayal Upadhyay Gorakhpur University is a education organization based out in Gorakhpur, Uttar Pradesh, India. It is known for research contribution in the topics: Thermal decomposition & Lymnaea acuminata. The organization has 1032 authors who have published 1591 publications receiving 21734 citations. The organization is also known as: Gorakhpur University.

Frequency-dependent core shifts and parameter estimation for the blazar 3C 454.3

Abstract: We study the core shift effect in the parsec-scale jet of the blazar 3C 454.3 using the 4.836.8 GHz radio light curves obtained from three decades of continuous monitoring. From a piecewise Gaussian fit to each flare, time lags Delta t between the observation frequencies. and spectral indices a based on peak amplitudes A are determined. From the fit Delta t..1/kr, kr = 1.10 +/- 0.18 indicating equipartition between the magnetic field energy density and the particle energy density. From the fit A proportional to nu(alpha) alpha, a is in the range -0.24 to 1.52. A mean magnetic field strength at 1 pc, B-1 = 0.5 +/- 0.2 G, and at the core, B-core = 46 +/- 16 mG, are inferred, consistent with previous estimates. The measure of core position offset is Omega(r nu) = 6.4 +/- 2.8 pc GHz(1/kr) when averaged over all frequency pairs. Based on the statistical trend shown by the measured core radius r(core) as a function of., we infer that the synchrotron opacity model may not be valid for all cases. A Fourier periodogram analysis yields power-law slopes in the range -1.6 to -3.5 describing the power spectral density shape and gives bend timescales in the range 0.52-0.66 yr. This result, and both positive and negative a, indicate that the flares originate from multiple shocks in a small region. Important objectives met in our study include: the demonstration of the computational efficiency and statistical basis of the piecewise Gaussian fit; consistency with previously reported results; evidence for the core shift dependence on observation frequency and its utility in jet diagnostics in the region close to the resolving limit of very long baseline interferometry observations.

Efficacy of euphorbia hirta latex as plant derived molluscicides against freshwater snails

Abstract: The toxic effect of binary and tertiary combinations of Euphorbia hirta Linn latex powder with other plant molluscicidal compounds, were evaluated against the freshwater snails Lymnaea (Radix) acuminata and Indoplanorbis exustus in pond. These combinations showed significant time and dose dependent effect against both the snails. These compounds at higher doses were also lethal to freshwater fish Channa punctatus (Bloch) (Channidae {Ophicephalidae}), which shares the habitat with these snails, but the LC90 (24h) doses of snails have no apparent killing properties in fish populations when treated in mixed population of snails and fish.