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Srivastava P.,SKN Sinhgad Institute of Technology and Science | Srivastava P.,Symbiosis Institute of Technology | Srivastava P.,Veermata Jijabai Technological Institute | Singh A.P.,SKN Sinhgad Institute of Technology and Science | And 8 more authors.
International Journal of Applied Engineering Research | Year: 2013

The past decade has proved an increasing interest in observers for nonlinear systems. This area is relevant in different contexts such as synchronization of dynamical systems, isolation and output feedback control. This paper consists of the contributions towards a new step i.e. the"New Directions in Nonlinear Observer Design". Here the notion of Contraction theory is used to design the observer. In this paper the example of Non-Holonomic system is opted and the non-linear observer is designed based on Contraction theory. Simulation is performed to validate the steps which are taken in design of observers. © Research India Publications.

Sharma V.,CSIR - National Chemical Laboratory | Sharma V.,University of Pune | Prasad M.,SKN Sinhgad Institute of Technology and Science | Jadkar S.,University of Pune | And 2 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2016

ZnO is one of the most promising candidate for photoelectrochemical splitting of water for hydrogen production. To increase the efficiency of ZnO based photoelectrochemical cell, its band-gap and band edges should be tailored to match visible light spectra and water redox potential respectively. In this paper, First-principles density functional theory calculations have been performed to evaluate the effect of non-metal dopants on electronic properties of ZnO. The model structures of X-doped ZnO were constructed using 32-atom 2 × 2 × 2 supercell of wurtzite ZnO with one O atom replaced with X (carbon C, phosphorus P). With respect to the electronic band structure, C (2p), P (3p) states are located above the valence band maximum of ZnO and mixing of these states is feeble to produce significant band gap narrowing. Doping of these non-metals dopants helps in the creation of isolated states which enhances visible light absorption of ZnO. Our theoretical calculations are consistent with the experimental results of C (P) doped ZnO and fully explains its visible light activity on non-metal doping. © 2016 Springer Science+Business Media New York

Singh A.P.,Symbiosis International University | Agarwal H.,Symbiosis International University | Srivastava P.,SKN Sinhgad Institute of Technology and Science
WSEAS Transactions on Systems and Control | Year: 2015

In this paper we propose a Fractional Order Controller for an under-actuated system (POAC). This system has two degrees-of-freedom and one control input. The model of the system is derived using Euler Lagrange method and the stabilization is achieved with constraints using Fractional Order Controller. To validate the control law, simulation are performed and compared with Integer Order Controller. © 2015 World Scientific and Engineering Academy and Society. All rights reserved.

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