Indus International University

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Banerjee B.,Indus International University
Arkivoc | Year: 2016

In recent years scandium(III) trifluoromethanesulfonate [Sc(OTf)3] has emerged as an efficient, mild, commercially available, inexpensive, water tolerant Lewis acidic catalyst in the formation of both carboncarbon and carbon-heteroatom bonds, and thereby the formation of various biologically promising organic compounds. The present review summarizes the latest developments on Sc(OTf)3-catalyzed organic transformations especially carbon-carbon and carbon-heteroatom bond forming reactions reported during the last decade. © 2017 by the authors; licensee MDPI, Basel, Switzerland.


Banerjee B.,Indus International University | Koketsu M.,Gifu University
Coordination Chemistry Reviews | Year: 2017

Recent, many methods have been reported for the synthesis of selenium-containing bioactive scaffolds because of their interesting reactivity and potential pharmaceutical applications. This review describes developments in the synthesis of selenium-containing biologically relevant scaffolds reported during the last decade. © 2017 Elsevier B.V.


Kumar S.,Thapar University | Kumar S.,Indus International University | Verma N.K.,Thapar University
Journal of Materials Science: Materials in Electronics | Year: 2014

In this study we have reported the effect of Ni-doping on optical and magnetic properties of ZnS nanorods. The diameter and length of low temperature solvothermally synthesized, high quality nanorods are 10 and 50-300 nm respectively as revealed from transmission electron microscopy. From X-ray diffraction, the structure of Ni-doped nanorods was observed as wurtzite with lattice parameters, a = 3.83 and c = 6.26. The band gap of the undoped and doped samples was found to be blue shifted as compared to the bulk counterpart when analyzed with UV-visible spectroscopy. Quenching in photoluminescence spectra was observed in case of Ni-doped nanorods as compared to undoped counterpart. The magnetization as analyzed from vibrating sample magnetometer was found to increase with 1 and 5 % Ni-doping concentration, and decrease with further increase in Ni-doping concentration, i.e., with 10 % Ni-doping. © 2013 Springer Science+Business Media New York.


Kumar S.,Thapar University | Kumar S.,Indus International University | Verma N.K.,Thapar University
Journal of Materials Science: Materials in Electronics | Year: 2014

In this report we have studied the magnetism induced in the undoped and Ni-doped ZnS nanocrystals synthesized via low temperature reflux method. The average diameter of the undoped and Ni-doped nanoparticles is ~3 nm as revealed from transmission electron microscopy and X-ray diffraction (XRD) studies. From XRD studies, the structure of Ni-doped nanocrystals was observed as cubic zinc blende with lattice parameter, a = 0.539 nm. The band gap of the undoped and Ni-doped ZnS nanocrystals, analyzed with UV-visible spectroscopy, was found to be blue shifted as compared to the bulk counterpart. Quenching in photoluminescence spectra was observed at higher Ni concentrations as compared to undoped counterpart. The induced magnetization as analyzed from vibrating samples magnetometer indicated a weak superparamagnetic like behavior in 1 % Ni-doped ZnS nanocrystals, whereas; at 5 and 10 % Ni-doping concentrations, ferromagnetic behavior is indicated. © 2013 Springer Science+Business Media New York.


The problem of elastic-plastic transition stresses of thick walled rotating cylinder by finite deformation under steady-state temperature has been solved by using the concept of generalised strain measure. It has been seen that with the increase of temperature, the cylinder having smaller radii ratios requires lesser angular velocity to become fully plastic as compared to cylinder having higher radii ratios. The result for the combined effect of rotation and temperature are calculated for fully plastic and depicted graphically.


Creep stresses for a thick isotropic spherical shell by finitesimal deformation under steady-state temperature and internal pressure have been derived by using Seth's transition theory. Results are depicted graphically. It is seen that shell made of incompressible material require higher pressure to yield as compared to shell made of compressible material. For no thermal effects, the result are same as given by Gupta, Bhardwaj, Rana, Hulsurkar, Bhardwaj, and Bailey.


Thakur P.,Indus International University
WSEAS Transactions on Applied and Theoretical Mechanics | Year: 2011

Elastic-plastic transitional stresses in an annular disc having variable thickness and variable passion's ratio subjected to internal pressure has been derived by using Seth's transition theory. It is seen that thickness and passion's ratio variation influence significantly the stresses and pressure required for initial yielding. The thickness variation reduces the magnitude of the stresses and pressure needed for fully plastic state. It is seem for fully plastic state that circumferential stresses is maximum at the outer surface.


Narayan S.,Indus International University
International Journal of Applied Mechanics and Engineering | Year: 2015

Piston slap is the major force contibuting towards noise levels in combustion engines.This type of noise depends upon a number of factors such as the piston-liner gap, type of lubricant used, number of piston pins as well as geometry of the piston. In this work the lateral and rotary motion of the piston in the gap between the cylinder liner and piston has been analyzed. A model that can predict the forces and response of the engine block due to slap has been dicussed. The parameters such as mass, spring and damping constant have been predicted using a vibrational mobility model.


Thakur P.,Indus International University
Thermal Science | Year: 2014

Thermal stress and strain rates in a thick walled rotating cylinder under steady state temperature have been derived by using Seth's transition theory. For elastic-plastic stage, it is seen that with the increase of temperature, the cylinder having smaller radii ratios requires lesser angular velocity to become fully plastic as compared to cylinder having higher radii ratios The circumferential stress becomes larger and larger with the increase in temperature. With increase of thickness ratio stresses must decrease. For the creep stage, it is seen that circumferential stresses for incompressible materials maximum at the internal surface as compared to compressible material, which increase with the increase in temperature and measure n.


The non-homogeneity is assumed due to variation of modulus of compression. It has seen that in the presence of temperature, a cylinder made of nonhomogeneous material k < 0 (Non-homogeneity is less at internal surface than at outer surface) require high pressure to become fully plastic as is required for initial yielding and this pressure goes on increasing with the increases in temperature, showing that a cylinder made of non-homogeneous material k < 0 is on the safer side of design. For homogeneous case, it has been observed that the circumferential stress has maximum value at the external surface of the cylinder made of incompressible material as compared to compressible material. For Homogeneous case, with effects of temperature reduces the stresses at the external surface of the cylinder in comparison to pressure effects only. Strain rates are found to be maximum at the internal surface of the cylinder made of compressible material and they decrease with the radius. With the introduction of temperature effect, the creep rates have higher values at the internal surface but lesser values at the external surface as compare to a cylinder subjected to pressure only.

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