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Arya S.K.,ABES Institute of Technology | Danewalia S.S.,Thapar University | Singh K.,Thapar University
Journal of Materials Chemistry C | Year: 2016

Glasses with composition B2O3-Li2O-ZnO-TiO2-V2O5 were prepared with a melt and quench technique with variable concentration of TiO2 and V2O5. Structural aspects of the as-prepared sample were explored with the help of electron paramagnetic resonance spectroscopy (EPR). Conductivity and dielectric properties of the glasses and nanocrystalline glass ceramic were investigated using impedance spectroscopy. Vanadium was present in these glasses in the V4+ state, however, in initial composition, it was in the V5+ state. The maximum quantity of TiO2 contained glasses formed a nanocrystalline rutile phase, which dominated the electronic conduction at lower temperatures with decreased activation energy, i.e. 0.21 eV. Moreover, the presence of a nanocrystalline TiO2 phase reduced the dielectric constant ∼3 at room temperature and 1 MHz with excellent stability over a wide temperature and frequency range. The present nanocrystalline glass ceramic and glasses can be used in fast communication devices. © 2016 The Royal Society of Chemistry.


Arya S.K.,ABES Institute of Technology | Singh K.,Thapar University
Journal of Thermal Analysis and Calorimetry | Year: 2015

In the present investigation, the effects of titanium and vanadium concentration on the thermal properties have been studied for 30Li2O-55B2O3-5ZnO-xTiO2-(10-x)V2O5 (0 ≤ x ≤ 10) glasses. To understand the crystallization mechanics, activation energy has been calculated using two different approaches, i.e., Kissinger model and Augis and Bennett model. Using the derivative differential thermal analysis, the inflection point temperature (T f) and crystallization constants k y(T) and k f(T), for different heating rates, have also been obtained for all the glasses. Furthermore, kinetic parameters such as fluctuation free volume (f g) and change in bulk thermal expansion coefficient (α f) have been calculated for all the glass samples. The replacement of V2O5 by TiO2 induces phase separation in glasses. © 2015 Akadémiai Kiadó, Budapest, Hungary.


Gupta R.K.,Thapar University | Kumar V.,Indian Institute of Technology Roorkee | Srivastava V.K.,ABES Institute of Technology
International Journal of Chemical Reactor Engineering | Year: 2010

This work aims at compiling the important works on the modeling of a fluid catalytic cracking (FCC) riser reactor. The modeling of a riser reactor is very complex due to complex hydrodynamics and unknown multiple reactions, coupled with mass transfer resistance, heat transfer resistance and deactivation kinetics. A complete model of the riser reactor should include all the important physical phenomena and detailed reaction kinetics. As the computational fluid dynamics (CFD) is emerging as a powerful tool for modeling the FCC riser, various works on riser modeling using CFD are also included in the paper. Copyright © 2010 The Berkeley Electronic Press.


Arya S.K.,ABES Institute of Technology | Arya S.K.,Thapar University | Singh K.,Thapar University
Journal of Non-Crystalline Solids | Year: 2015

The structural and optical properties have been investigated for the 30Li2O-55B2O3-5ZnO-xTiO2-(10 - x)V2O5, (0 ≤ x ≤ 10) glasses using different spectroscopic characterization techniques. The relationship between optical and structural properties has been established in light of the variation of TiO2 content. The band gap shows a decreasing trend with a decrease in V2O5 content. Physical parameters like density, molar volume, ionic concentration and inter ionic distance have been obtained for all the glass compositions. Theoretical parameters like optical basicity, oxide polarizability and electronegativity have been obtained and discussed in relation to the non-bridging oxygen (NBO). Bulk modulus has been calculated theoretically and correlated with average stretching force constant and network bonds/volume. © 2015 Elsevier B.V. All rights reserved.


Arya S.K.,ABES Institute of Technology | Arya S.K.,Thapar University | Kaur G.,Thapar University | Singh K.,Thapar University
Journal of Non-Crystalline Solids | Year: 2015

In the present studies, the effects of vanadium substitution for 30Li2O-55B2O3-(15-x) ZnO-xV2O5, (0≤x≤7.5) glass system on the physical and optical properties have been investigated. V2O5 can work as a conditional glass former and its incorporation into glass yields vanadyl ions (VO2+), which causes considerable change in the structure of glass. The glass composition can be tailored by optimizing the zinc and vanadium content so as to obtain the desirable semiconducting or optical applications. Physical parameters like density, molar volume, molar electro-negativity, oxide electro-negativity, basicity moderating parameters, ionic concentration, and inter-ionic distance are obtained for all the glass compositions. Characterization techniques like X-ray diffraction (XRD), UV-Visible and Fourier transforms infra-red spectroscopy (FTIR) are used to yield the structural and optical parameters. Average stretching force constant, network bond/volume and bulk modulus are calculated theoretically and correlated with each other. The Urbach energy as well as optical band gap shows a decreasing trend with decreasing concentration of V2O5 with respect to ZnO content. © 2015 Elsevier B.V.


PubMed | National Physical Laboratory India, ABES Institute of Technology and Thapar University
Type: Journal Article | Journal: The journal of physical chemistry. B | Year: 2016

In the present study, the effect of variable vanadium oxidation states on the structural, optical, and dielectric properties of vanadium oxide containing lithium borate glasses has been investigated. Electron paramagnetic resonance studies indicate that vanadium in these glasses is mostly in the V


Kumar P.,ABES Institute of Technology
Proceedings of the 2015 39th National Systems Conference, NSC 2015 | Year: 2015

In analog system designing integrators are preferred over differentiators due to stability and saturation problems. Integrators find applications in various field controls, wave shaping, image blurring, and microwave integrators. Simpson and Trapezoidal rule have advantages in sense of phase contribution providing by integrators, π/2 that is similar to ideal integrator phase response. Whereas Rectangular, two-point extrapolation and three-point rules of integrators suffer a fix amount of phase error. There is different digital integration rules can be fit for different microwave integrators structures i.e. decided by trial and error. In this paper proposed Simpson integrator at low frequency approximated to microwave frequency range. © 2015 IEEE.


Patel R.,ABES Institute of Technology | Thakur P.,Jaypee University of Information Technology | Katiyar S.,ABES Institute of Technology
Advances in Intelligent Systems and Computing | Year: 2016

Compressive sampling emerged as a very useful random protocol and has become an active research area for almost a decade. Compressive sampling allows us to sample a signal below Shannon Nyquist rate and assures its successful reconstruction with some limitations on signal, that is, signal should be sparse in some domain. In this paper, we have used compressive sampling for an arbitrary one-dimensional signal and two-dimensional image signal compression and successfully reconstructed them by solving L1-norm optimization problems. We also have showed that compressive sampling can be implemented if a signal is sparse and incoherent through simulations. Further, we have analyzed the effect of noise on the recovery. © Springer Science+Business Media Singapore 2016.


Maurya S.,ABES Institute of Technology
International Journal on Smart Sensing and Intelligent Systems | Year: 2010

In this paper, some design issues of one of the planar-guided media known as Microstrip line has been presented. The main purpose of this paper is to study the fundamental transmission properties of the microstrip line in view of varying the length, materials used for device formation/fabrication and highest frequency of operation. The paper is mainly divided in to two portions; first portion deals with theoretical portion because, it is necessary to know how the characteristic impedance, phase velocity, and attenuation constant of the dominant mode of microstrip depend on geometrical factors, on the electronic properties of substrate and conductors used, and on the frequency. Since this is a "mixed" dielectric system, the TEM mode can not be supported [2] and the second portion of the investigation was devoted to the effect of variation of length and frequency on the RF performance of the line. Although many papers are available on this topic, but the issues described in this paper have somewhat different point of view.


Patel R.,ABES Institute of Technology | Arora K.,ABES Institute of Technology | Katiyar S.,ABES Institute of Technology
Proceedings - 2016 2nd International Conference on Computational Intelligence and Communication Technology, CICT 2016 | Year: 2016

The aim of this paper is to analyze wind energy conversion system (WECS) using permanent magnet synchronous generator (PMSG). The configuration consists of a Permanent magnet synchronous generator incorporated with certain power electronic circuits feeding to a three phase load. Wind power control is done with the help of Buck boost converter connected across the dc link so as to keep constant voltage supply. Proposed scheme gives a low cost and high quality power conversion solution for variable speed WECS. The simulation under different loading conditions is thus carried on MATLAB/SIMULINK. © 2016 IEEE.

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