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Zafar R.,Indian National Institute of Engineering | Zafar R.,Swami Keshvanand Institute of Technology | Salim M.,Indian National Institute of Engineering
IEEE Journal of Quantum Electronics | Year: 2015

In this paper, we have generated an effect of electromagnetic-induced transparency (EIT)-like transmission in a pair of resonators coupled to a metal-insulator-metal waveguide. Resonators are separated by the metallic nanoslit. By controlling single parameter (i.e., the width of the metallic slit), the device is made to exhibit EIT-like transmission. EIT is the result of destructive interference between two resonating modes, which leads to an asymmetrical-shaped resonance called Fano resonance. EIT is generally accompanied with sharp dispersion that reduces the velocity of light near the resonance. The slow-light characteristics of the device are also investigated. An ultra large value of group index (ng = 17.06) and a large value of normalized delay bandwidth product (NDBP = 0.88) is obtained over an ultra large bandwidth (Δf = 1.39 THz). Furthermore, it is theoretically predicted that asymmetry parameter (q) of Fano resonance experiences a sign reversal when resonances are swept each other in the tuning process. This reversible Fano resonance and slow-light nature of proposed device open up the avenues for designing on-chip optical buffers, switches, modulators, and so on. © 1965-2012 IEEE.

Sharma V.,Swami Keshvanand Institute of Technology | Gupta K.D.,Malaviya National Institute of Technology, Jaipur
Collection of Czechoslovak Chemical Communications | Year: 2010

The reduction of indium(III) at dropping mercury electrode in aqueous as well as in 25% ethanol-water media in the presence of pyridine has been studied at a constant ionic strength (0.1 m KNO3) and at 30 and 40 °C. The reduction is diffusion-controlled but the electrode process is quasi-reversible in both media. The reversible half-wave potential values, E1/2r, have been obtained by Gelling's method. The plot of E1/2r versus pyridine concentration is a straight line and the number of ligands, J, was determined from the slope. This shows the formation of a single complex. The stability constant has been determined by Lingane's method. In(III) forms one complex species with composition 1:1, [In(py)]3+. The values of thermodynamic parameters ΔG, ΔH and ΔS of the complexation reaction have also been determined at 30°C. © 2010 Institute of Organic Chemistry and Biochemistry.

Sharma V.,Swami Keshvanand Institute of Technology | Gupta K.D.,Malaviya National Institute of Technology, Jaipur
Monatshefte fur Chemie | Year: 2011

Gallium complexes of l-glutamine have been studied polarographically in aqueous media. The reduction was found to be irreversible and diffusion controlled in the presence of 0.1 M KNO3 and 0.002% Triton-x-100. The values of kinetic parameters, transfer coefficient (α n), and formal rate constant ($$ k-{{{\text{f}},{\text{h}}}}^{0} $$ ) of the electrode reactions were calculated by Koutecky's method. The stability constants and composition of the gallium(III)-l-glutamine complexes were evaluated with the help of the Deford-Hume method. The values of stability constants of 1:1, 1:2, and 1:3 gallium(III)-l-glutamine complexes are 1.35, 6.5, and 1,350 at 30 °C, respectively. The values of thermodynamic parameters, the free energy of activation, the enthalpy of activation, and the entropy of activation have been determined at 30 °C. The formation of the metal complexes has been found to be non-spontaneous, endothermic in nature, and entropically favorable at higher temperature. © 2011 Springer-Verlag.

Jain R.K.,Swami Keshvanand Institute of Technology | Jain A.,University of Rajasthan | Jain I.P.,University of Rajasthan
International Journal of Hydrogen Energy | Year: 2012

The effect of partial substitution of Ce by La in CeNi 3Cr 2 hydrogen storage alloy has been systematically investigated. All intermetallic compounds Ce 1-xLa xNi 3Cr 2 (x = 0.2, 0.4, 0.6, 0.8, 1) synthesized by arc melting method are well characterized by the means of XRD and SEM. XRD results show that all the alloys are crystallized as a single-phase compound in the hexagonal CaCu 5 type structure. The substitution of Ce by La leads to increase the unit cell volume of the alloy. Hydrogen storage capacity has been investigated in the temperature and pressure range of 293 K ≤ T ≤ 323 K and 0.5 ≤ P ≤ 45 bar respectively using pressure-composition isotherm. The P-C isotherm curves show that the plateau pressure of the hydrogen absorption decreases and hydrogen storage capacity increases with increasing La content in the alloy. The enthalpy (H) and entropy (S) of dissolved hydrogen for all systems has been calculated using Van't Hoff plot. The variation of H and S with hydrogen content has also been studied which confirm the phase boundaries. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Pandey P.,Swami Keshvanand Institute of Technology
Proceedings - 2015 5th International Conference on Communication Systems and Network Technologies, CSNT 2015 | Year: 2015

A multi hop vehicular ad hoc network is a peer to peer network of wireless nodes where nodes are required to perform routing activity to provide end to end connectivity among nodes. As vehicles are constrained by bandwidth, some vehicles may behave selfishly and deny forwarding packets for other nodes, even though they expect other nodes to forward packets to keep network connected. We simulate forwarding node selfish behavior on top of ad hoc on demand distance vector routing protocol (AODV). In forwarding node selfish behavior, selfish nodes do not forward data or control packets (routing packets) for other nodes. We show that selfish behavior reduces routing overhead of network which intern decrease collision and increase throughput of dense network. Secondly, with our simulation study we find that in dense vehicular ad hoc networks where route breakages are frequent, routing control packets consume significant fraction of network bandwidth (also refer as broadcast storm problem) and selfish behavior by certain number of vehicles reduce the overall routing overhead in network which in turn result in increment of network throughput. © 2015 IEEE.

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