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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 | 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.

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.

Kumar M.,Kumaun University | Pravesh R.,Kumaun University | Tripathi D.K.,Kamla Nehru Institute of Physical and Social science
Proceedings of the National Academy of Sciences India Section A - Physical Sciences | Year: 2015

This study compares the methods of weighting assessment techniques including the ranking, rating, pairwise comparison, and trade-off analysis and its integration with geographic information system (GIS) based multicriteria decision making (MCDM) to evaluate the suitable sites for urban development in Mussoorie municipal area, Dehradun district, Uttarakhand (India). For this purpose IKONOS satellite data and topographical sheet were used to generate various thematic layers using ArcGIS software. Six criteria including slope, road proximity, land use/cover, land values, geological formation and aspect were used for appropriate land evaluation. The generated thematic maps of these criteria were normalized using weighting assessment techniques. By using these techniques a weight for each criterion was generated by comparing them with each other according to their importance. With the help of these weights and criteria, final site suitability map for each weighting methods was prepared. In this paper the integrated approach of weighting assessment techniques and GIS based MCDM represents a major contribution towards the development of effective spatial decision support systems. © 2014, The National Academy of Sciences, India.

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.

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