Kamla Nehru Institute of Physical and Social science

Sultānpur, India

Kamla Nehru Institute of Physical and Social science

Sultānpur, India
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Prasad G.,Kamla Nehru Institute of Physical and Social science
General Relativity and Gravitation | Year: 2017

Relativistic formulation of Helmholtz’s vorticity transport equation is presented on the basis of Maxwell-like version of Euler’s equation of motion. Entangled characteristics associated with vorticity flux conservation in a vortex tube and in a stream tube are displayed on basis of Greenberg’s theory of spacelike congruence of vortex lines and 1 + 1 + (2) decomposition of the gradient of fluid’s 4-velocity. Vorticity flux surfaces are surfaces of revolution about the rotation axis and are rotating with fluid’s angular velocity due to gravitational isorotation in a stationary axisymmetric perfect fluid configuration. Fluid’s angular velocity, angular momentum per baryon, injection energy, and invariant rotational potential are constant on such vorticity flux surfaces. Gravitation causes distortion of coaxial cylindrical vorticity flux surfaces in the limit of post-Newtonian approximation. The rotation of the fluid with angular velocity relative to vorticity flux surfaces generates swirl which causes the stretching of material vortex lines being wrapped on vorticity flux surfaces. Fluid helicity which is conserved in the fluid’s rest frame does not remain conserved in a locally nonrotating frame because of the existence of swirl. Vortex lines are twist free in the absence of meridional circulations, but the twisting of spacetime due to dragging effect leads to the increase in vorticity flux in a vortex tube. © 2017, Springer Science+Business Media New York.


Pandey R.K.,Kamla Nehru Institute of Physical and Social science
Annual Research and Review in Biology | Year: 2017

The effects of dimethoate on pituitary prolactin cells of Heteropneustes fossilis was investigated in this study. The fish Heteropneustes fossilis were subjected to sub-lethal concentration of dimethoate - 2.24 mg/l i.e. 75% of 96 h LC50 for short-term (24, 48, 72 and 96 h), and 1.00 mg/l i.e. 25% of 96 h LC50 for long-term (6, 12, 24 and 36 d) exposure. Pituitary was removed from anaesthetised fish and fixed for histological examinations. H. fossilis exposed for short-term (96 h) at sub-lethal dimethoate concentration, exhibited marked changes in structure and staining properties of prolactin cells. PRL cells did not show much histological alterations after 24 h, however, after 96 h exposure exhibited severe vacuolization and nuclear pycnosis, indentation and deformity of nuclear boundaries. In long-term dimethoate exposure the PRL cells of Heteropneustes fossilis, exhibited low staining response invisible vacuolization and distinct nuclear boundaries after 6 day. However, severe vacuolization, pycnosis and the nuclear diameter reduction in PRL cells were noticed after 24 d and 36 d exposures. The study concluded that dimethoate affects calcium regulating prolactin (PRL) cells and disturb the calcium homeostasis of fish which is important for fish health and their survival. © 2017 Pandey.


Kumar A.,Government College Banjar | Bahadur A.,Kamla Nehru Institute of Physical and Social science | Mishra M.,Birla Institute of Technology and Science | Vasudeva N.,S V G College
AIP Conference Proceedings | Year: 2015

We study the effect of vacancies on the structural, electronic and magnetic properties of zigzag boron nitride nanoribbon (ZBNNR) by using first principle calculations. We find that the shift of the vacancies with respect to the ribbon edges causes change in the structural geometry, electronic structure and magnetization of ZBNNR. These vacancies also produce band gap modulation and consequently results the magnetization of ZBNNR. © 2015 AIP Publishing LLC.


Khan A.J.,Kamla Nehru Institute of Physical and Social science | Khan R.A.,Manav Rachna International University | Singh V.M.,Manav Rachna International University | Newati S.J.,Manav Rachna International University | Yusuf M.,Hamdard University
Journal of Bionanoscience | Year: 2013

Functionalized single-walled carbon nanotube (f-CNT) and, supramolecular 300 bps deoxyribose nucleic acid (DNA) conjugate models were generated in silico as intended molecular transporters using HyperChem® 7.5 molecular modeling software. The physico-chemical characteristics and, conjugate geometries for different sets of CNT-DNA composition conjugates with varying molecular masses and, componential ratios in empirical and, non-empirical sets along with the binding patterns and, feasibility of conjugation at varying CNT sites were carried out. The configurations of nanoarchitecture in self-assembling process, geometrical and, configurational deformity among the congenial components and, resultant conjugates, the stability, energy levels and, hydrophilicity were estimated. The characteristics of CNT-DNA conjugate with componential ratios of 1:2 were found optimal with molecular weight ratios ranging between single f-CNT of 2300 amu with two units of DNA of either 75 bps or, of 150 bps length wherein later was intended for heavy ligands uploading as molecular transporters for various biochemical and, cellular engagements. Copyright © 2013 American Scientific Publishers.


Bahadur A.,Kamla Nehru Institute of Physical and Social science | Verma M.L.,SSGI | Mishra M.,Birla Institute of Technology and Science
European Physical Journal B | Year: 2015

Using first principle calculation, we investigate the structural, electronic and magnetic properties of silicon doped zigzag boron nitride nanoribbon (ZBNNR). Our results show that the shift in position of silicon doping with respect to the ribbon edge causes change in the structural geometry, electronic structure and magnetization of ZBNNR. The band gap of silicon doped ZBNNR is found to become narrower as compared to that of perfect ZBNNR. We find that band gap and magnetic moment of ZBNNR can be tuned by substitutional silicon doping position and doping concentration. © 2015, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.


Bahadur A.,Kamla Nehru Institute of Physical and Social science | Mishra M.,Birla Institute of Technology and Science
Acta Physica Polonica A | Year: 2013

A simple correlation between the high-frequency refractive index and electronegativity difference has been established for large number of A NB8-N type binary semiconductors. The proposed relation has been applied satisfactorily to evaluate the refractive index of binary semiconductors belonging to groups I-VII, II-VI, III-V and IV-VI. The estimated values of refractive index from present relation are utilized to calculate the electronic polarizability of compounds by applying the Lorentz-Lorentz formula. Our calculated values of refractive index and electronic polarizability are in good agreement with the values evaluated by earlier researchers.


Singh S.P.,M M H College | Srivastava S.K.,Kamla Nehru Institute of Physical and Social science | Bahadur A.,Kamla Nehru Institute of Physical and Social science
Indian Journal of Physics | Year: 2011

In the present work, we have studied a plasmon model for the specific contributions of intrinsic as well as extrinsic plasmon effects. The interference 'plasmon-coupling' have been obtained theoretically in terms of non-diagram line to diagram X-ray line for the low and high energy satellite profiles in the X-ray photoemission spectra. It is found that our results demonstrate generalized mechanism for the origin of X-ray photoemission satellite spectra. © 2011 IACS.


Prasad G.,Kamla Nehru Institute of Physical and Social science
General Relativity and Gravitation | Year: 2012

In this paper, it is shown that the magnetic helicity dissipation per unit volume, coupled with the longitudinal conductivity, causes enhancement of the kinematic rotation of the electric (and magnetic) lines if the npe-plasma vorticity vector aligns with the electric (or the magnetic) field. In the case of a rigidly rotating npe-plasma under the influence of a strong magnetic field, the electric lines are rotating faster than the magnetic lines. It is deduced that the orthogonality of the electric and magnetic fields is an essential condition for the conduction current to remain finite in the limit of infinite electric conductivity of the npe-plasma. In this case, the magnetic field is not frozen into the npe-plasma, but the magnetic flux in the magnetic tube is conserved. The hybrid helicity is conserved if the "magneto-vorticity" vector is tangent to the level surfaces of constant entropy per baryon. The "magneto-vorticity" lines are rotating on the level surfaces of constant entropy per baryon due to the electromagnetic energy flow in the direction of the npe-plasma vorticity and the chemical potential variation locked with the kinematic rotation of the npe-plasma flow lines. In the case of an isentropic npe-plasma flow, there exists a family of timelike 2-surfaces spanned by the "magneto-vorticity" lines and the npe-plasma flow lines. In this case, the electric field is normal to such a family of timelike 2-surfaces. Maxwell like equations satisfied by "magneto-vorticity" bivector field are solved in axially symmetric stationary case. It is shown that the npe-plasma is in differential rotation in such a way that its each plasma shell (i. e., plasma surface spanned by "magneto-vorticity" lines) is rotating differentially without continually winding up "magneto-vorticity" lines frozen into the npe-plasma. It is also found that gravitational isorotation and Ferraro's law of isorotation are intimately connected to each other because of coexistence of both the plasma vorticity and the magnetic field due to interaction between the electromagnetic field and npe-plasma flows. © 2012 Springer Science+Business Media, LLC.


Tripathi D.K.,Kamla Nehru Institute of Physical and Social science
Transactions of the Institute of Indian Geographers | Year: 2010

The present study is an attempt to identify the planning priority zones (PPZ) for land resource development in Gauriganj Block, Sultanpur District (U.P). The satellite image (1RS P6, LISS III) was processed in digital image processing software ERDAS IMAGINE 9.1 using ISODATA pixel clustering algorithm (unsupervised classification approach) and spectral enhancement (NDVI) techniques for data base generation on land use/land cover and vegetation density. The data generated through remote sensing techniques have been integrated with other non-spatial socio-economic data for identification of PPZ for land resource development. Criterion based technique was used for data integration and PPZ identification. As per analysis out of 100 villages in the study area, 18 villages fall in first priority zone, 55 in second, 24 in third and 03 in fourth PPZ of land resource development. These PPZ may be taken up for developing plan in a phased manner.


Sharma A.K.,Allahabad University | Singh N.,Allahabad University | Singh S.P.,Kamla Nehru Institute of Physical and Social science
2012 1st International Conference on Recent Advances in Information Technology, RAIT-2012 | Year: 2012

This paper presents the gain and noise figure optimization of Raman fiber amplifier in S-band for single-mode fiber (SMF) and dispersion-shifted fiber (DSF) by using WDM pumping scheme. For single-mode fiber 16 dB gain with 50 nm bandwidth and for dispersion-shifted fiber 19 dB gain with 40 nm bandwidth is obtained. In both cases noise figure is also achieved. © 2012 IEEE.

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