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Pandey B.,Symbiosis Institute of Technology | Pandey B.,Brazilian Center for Research in Physics (CBPF) | Litterst F.J.,Brazilian Center for Research in Physics (CBPF) | Litterst F.J.,TU Braunschweig | Baggio-Saitovitch E.M.,Brazilian Center for Research in Physics (CBPF)
Journal of Magnetism and Magnetic Materials | Year: 2015

Zinc ferrite nanoparticles powder with average size of 10.0±0.5 nm was synthesized by the citrate precursor route. We studied the structural and magnetic properties using X-ray diffraction, vibrating sample magnetometry and Mössbauer spectroscopy. X-ray diffraction patterns show that the synthesized zinc ferrite possesses good spinel structure. Both Mössbauer and magnetization data indicate superparamagnetic ferrimagnetic particles at room temperature. The magnetic behavior is determined by a considerable degree of cation inversion with FeIII in tetrahedral A-sites. Mössbauer spectroscopy at low temperature and in high applied magnetic field reveals that A-site spins are aligned antiparallel to the applied field with some possible angular scatter whereas practically all octahedral B-site spins are canted contrasting some earlier reported partial B-site spin canting in nanosize zinc ferrite. Deviations from the antiferromagnetic arrangement of B-site spins are supposed to be caused by magnetic frustration effects. © 2015 Elsevier B.V. All rights reserved.

Bansod G.V.,Symbiosis Institute of Technology
Proceedings - 2011 IEEE International Conference on Control System, Computing and Engineering, ICCSCE 2011 | Year: 2011

Low power applications are major concern area nowadays. One of the major aspects is cryptography which includes software cryptography in audio as well as video applications. Many algorithms are developed to achieve software cryptography. But in recent year's algorithm are proved to be more efficient. This paper aims to enhance characteristics of HDL based implementation of GRP algorithm. As GRP algorithm is most attractive in term of sorting and cryptographic contents [8]. In this paper low power HDL based design is implemented for audio based applications with much more less power without losing encryption standards as compared to previous algorithms like EMSN[1]. This paper proposes a new algorithm REMS which is rich in encryption standards and consumes much more less power. © 2011 IEEE.

Ahirrao S.,Symbiosis Institute of Technology | Ingle R.,Pune Institute of Technology
Proceedings of the 2013 3rd IEEE International Advance Computing Conference, IACC 2013 | Year: 2013

Cloud computing has become an promising and popular prototype, by presenting its different popular paradigm as infrastructure as a service, platform as a service, software as a service. Now a days there is a challenge of building scalable, available, consistent Cloud Data Stores. In this paper, data partitioning approach such as static and dynamic partitioning are discussed. The main objective of this paper is to bring out the issues in the area of database scalability and to discuss the opportunities open for research work. In this paper, taxonomy of data management in Cloud is proposed. This paper also introduces the design model for partitioning scheme. © 2013 IEEE.

Bansal R.K.,Department of National Defence | Lande C.K.,Symbiosis International University | Warke A.,Symbiosis Institute of Technology
Journal of Hydrologic Engineering | Year: 2016

In this paper, new analytical solutions are presented to quantify interaction of water between a sloping aquifer and stream of varying heads in presence of a thin vertical sedimentary layer. The initial hydrogeological setting consist of an unconfined sloping aquifer of semi-infinite extent, a fully penetrating stream of varying water level, and a vertical layer of streambank deposits that acts as an interface between stream and aquifer. Unsteady groundwater flow is characterized by a nonlinear Boussinesq equation subject to Robin boundary condition (also referred to as third kind and Cauchy boundary condition). Unlike existing results, which focus only on step changes in stream stage, the current study accounts for gradual rise and decline in stream level. A closed-form analytical solution for water head distribution, discharge rate, and net volumetric exchange of water between stream and aquifer are developed from the solution of a linearized advectiondiffusion equation. Performance of the analytical solution is compared with the numerical solution of the corresponding nonlinear Boussinesq equation using L2 and Tchebycheff norms. It is shown that the linearization yields acceptable solutions in many and varied situations where a stream interacts with an aquifer. The analytical solutions are presented in a manner that several other configurations, namely, zero slope, absence of vertical clogging layer, and abrupt changes in stream stage can be deduced as limiting cases of the main results. Combined effects of streambank leakance, bed slope, and stream-stage variation rate on the bank storage characteristic of the aquifer are illustrated with a numerical example. © 2016 American Society of Civil Engineers.

Upadhyay S.,Symbiosis Institute of Technology | Parekh K.,D. C. R. University of Science and Technology | Pandey B.,Symbiosis Institute of Technology
Journal of Alloys and Compounds | Year: 2016

Structural and magnetic properties of chemically synthesized magnetite nanoparticles have been studied using X-ray diffraction, Transmission Electron Microscopy and Vibrating Sample Magnetometer. Magnetically the synthesized nanoparticles are ranging from superparamagnetic to multi domain state. Average crystallite size of the synthesized magnetite nanoparticles were determined using X-ray line broadening and are found to be in the range of 9-53 nm. On the other hand, the TEM images show that the size is ranging between 7.9 and 200 nm with the transition from spherical superparamagnetic particles to faceted cubic multi domain particles. Magnetic parameters of the samples show a strong dependence on average crystallite size. The ratio of coercive field at 20 K to that at 300 K (Hc (20 K)/Hc (300 K)) increased sharply with decrease in crystallite size. A critical crystallite diameter of order 36 nm may be inferred as boundary between single domain to multi domain transition. Zero-field-cooled (ZFC) and field-cooled (FC) measurements at 10 Oe field validate the same for smallest and largest size samples, confirming that the anisotropy energy is greater than thermal energy upto 300 K temperature. For 9 nm sample broad ZFC curve with overlapping of FC curve is observed just at 300 K, indicating the effect of strong dipolar field in superparamagnetic system. © 2016 Elsevier B.V.

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