Vārānasi, India
Vārānasi, India

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Toldan T.,Bananas Hindu University | Santeshwari,Bananas Hindu University | Raghuraman M.,Bananas Hindu University | Kumar D.,Bananas Hindu University
Indian Journal of Ecology | Year: 2016

Diversity of collembola in different tree ecosystems, were investigated in Varanasi, Uttar Pradesh. A total of 2568 specimens of 10 genera belonging to 8 families viz., Isotomidae, Entomobryidae, Paronellidae, Cyphoderidae, Onychiuridae, Hypogastruridae, Sminthurididae, and Katiannidae were recorded. Collembola genera viz., Lepidocyrtus sp., Entomobrya sp., Hypogastrurasp., Sminthurinus sp, Sminthurides sp, were most common among almost all the ecosystems followed by Isotomurus sp., Crytopygus sp., Cyphoderus sp., Onychiurus sp, and Folsomia sp. A Maximum population of 17.71% was recorded during the month of September in Bael ecosystem and minimum in the Aonla ecosystem. In the abundance of collembola in general, there were pronounced seasonal fluctuations of different genera in all the ecosystems. Two peaks in September and October and a fall in December was observed in the population fluctuation. The distribution and abundance of soil fauna was more during monsoon period. These organisms play a functional role in soil ecosystem and there is lack of enough records of these beneficial insects from different ecosystems.


Kumari S.,Bananas Hindu University | Singh S.,Bananas Hindu University
Phase Transitions | Year: 2015

Employing a phenomenological mean field theory, we analyze the effect of an electric field on the N − SmA phase transition for pure liquid crystal and on the reentrant nematic phase in a binary mixture of liquid crystals exhibiting the phase sequence I − N − SmA − NR on cooling. The basic idea of the work is to explain the phase transition behavior of the system by assuming that certain Landau coefficients associated with the order parameters coupling terms of the free-energy density expansion are field dependent. These parameters play a crucial role and show a rapid variation at the SmA − NR transition as compared to the SmA − N transition. © 2015 Taylor & Francis


Singh L.P.,Bananas Hindu University | Ram S.D.,Bananas Hindu University | Singh D.B.,Bananas Hindu University
Acta Astronautica | Year: 2011

A systematic perturbation scheme is used to study the propagation of a weak shock wave attached to a slender body in a supersonic flow of plasma with thermal radiation and investigate as to how the coupling between the radiative transfer and magneto-hydrodynamic phenomena affects the flow field. The analytical solution of the flow field has been presented up to the second order of ε. The shape of the shock wave attached to the slender body of revolution is obtained, which however can be expressed explicitly in terms of known functions when the radiative decay length is of the same order as the typical body length. Also, the shock angle at the tip of the projectile is obtained. © 2010 Elsevier Ltd.


Singh L.P.,Bananas Hindu University | Ram S.D.,Bananas Hindu University | Singh D.B.,Bananas Hindu University
Acta Astronautica | Year: 2010

A problem of propagation of weak planer shock wave in radiative magnetogasdynamics is theoretically investigated. The gas is taken to be sufficiently hot for the effects of thermal radiation to be significant, which are of course treated by the optically thin approximation to the radiative transfer equation. The density of the medium ahead of the shock wave is assumed to be exponentially varying. A systematic perturbation scheme is used to obtain the analytical solution of the flow field. Also, an approximate solution near the front shock is determined. The effect of radiation and magnetic field strength on the shock wave propagation is examined. © 2010 Elsevier Ltd. All rights reserved.

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