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Sharma H.K.,A.P.S. University | Shukla P.K.,Its Engineering College | Agrawal S.L.,A.P.S. University
Journal of Materials Science: Materials in Electronics | Year: 2017

A systematic study is presented on the synthesis of ZnS nanoparticles by using simple chemical precipitation method without using any capping agent. The ZnS nanoparticles have been synthesized using precursor solution with different Zn2+:S2− ratio. The as synthesized nanoparticles have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), UV–Vis absorption spectroscopy and impedance spectroscopy. The XRD patterns reveal the formation of ZnS nanoparticles with wurtzite hexagonal phase which changes to sphalarite phase for higher concentration of S2− in the precursor solution. XRD, SEM and AFM studies have shown enhancement in particle size on increasing sulphur content. SEM and AFM images depict formation of deformed spherical nanoparticles with particle size ranging from 10 to 50 nm. Optical absorption spectra of synthesized material show a red shift in the optical absorption on increase of S2− ion concentration. Variation in electrical conductivity obtained from impedance measurements at different temperatures has been suitably correlated to Davis–Mott model. © 2017 Springer Science+Business Media New York


Tomer P.,Its Engineering College | Chandra M.,Institute of Management Studies
ICNIT 2010 - 2010 International Conference on Networking and Information Technology | Year: 2010

Vehicular Ad-hoc Network (VANET) is an emerging new technology integrating adhoc network, wireless LAN (WLAN) and cellular technology to achieve intelligent intervehicle communications and improve road traffic safety and efficiency. Vehicles are able to exchange information within these networks without the need of installing any infrastructure along the roadside VANETs can be used to improve the road safety by e.g. warning drivers about accidents in front of the road or to provide Internet access to the passengers via gateways along the road. However, the routing of data packets through the VANET is very complex since network topology change rapidly and communication conditions may vary heavily. Therefore, VANETs pose many unique networking research challenges, and the design of an efficient routing protocol for VANETs is very crucial. In this paper, we discuss the application of existing routing protocols for VANETs. © 2010 IEEE.


Singh A.K.,ITS Engineering College | Senani R.,Netaji Subhas Institute of Technology
Radioengineering | Year: 2012

The objective of this paper is to present a new universal current-mode biquad capable of providing all the five basic filter functions, namely, low pass (LP), band pass (BP), high pass (HP), band reject (BR) and all pass (AP) from the same configuration using only three Z-copy current follower transconductance amplifiers (ZC-CFTA) along with the provision of independent electronic tunability of the filter parameter ω 0 and Q 0 (or bandwidth) through two separate DC bias currents while employing both grounded capacitors as desirable for integrated circuit implementation. The workability of the proposed structure is verified by PSPICE simulations based on CMOS implementation of the ZC-CFTA.


Gupta A.,ITS Engineering College | Senani R.,Netaji Subhas Institute of Technology | Bhaskar D.R.,Jamia Millia Islamia University | Singh A.K.,ITS Engineering College
Circuits, Systems, and Signal Processing | Year: 2012

New grounded frequency-dependent negative-resistance (FDNR) and grounded inductance simulation circuits, employing an operational trans-resistance amplifier (OTRA) along with two capacitors, two resistors and a voltage follower have been introduced. The application of the new simulators in the realization of a single-resistance controlled oscillator (SRCO) and a single-capacitance controlled oscillator (SCCO) has been demonstrated and the effect of parasitic capacitance and input and output resistances of the OTRA on the performance of these circuits has been evaluated. The workability of the application circuits has been confirmed by experimental results using an OTRA-implemented from commercially available AD844-Type current-feedback operational amplifiers (CFOAs). © Springer Science+Business Media, LLC 2011.


Singh A.K.,ITS Engineering College | Senani R.,Netaji Subhas Institute of Technology
Analog Integrated Circuits and Signal Processing | Year: 2013

The differential difference amplifier (DDA) was introduced more than two decades back and its several applications as well as bipolar/CMOS implementations have been reported so far. This paper presents a new second order multiple-input-single-output type universal filter configuration using only two DDAs along with only five passive components which can realize all the five generic filter functions from the same configuration under various conditions in terms of the four input signals. Furthermore, it is demonstrated that DDA-based circuits can be practically implemented using commercially available video differencing amplifier IC AD830. © 2013 Springer Science+Business Media New York.


Yadav S.,Its Engineering College | Kaushal M.,National Institute of Technology Hamirpur | Varun,National Institute of Technology Hamirpur | Siddhartha,National Institute of Technology Hamirpur
Experimental Thermal and Fluid Science | Year: 2013

An experimental investigation has been carried out to study the effect of heat transfer and friction characteristics of turbulent flow of air passing through rectangular duct which is roughened by circular protrusions arranged in angular arc fashion. The roughened wall is uniformly heated while other three walls are kept insulated. The thermal and friction characteristics are governed by duct aspect ratio (W/H), hydraulic diameter (D), relative roughness pitch (P/e), relative roughness height (e/D), arc angle (α) and Reynolds number (Re). Experiments encompassed that the Reynolds number ranges from 3600 to 18,100, P/e ranges from 12 to 24, e/D ranges from 0.015 to 0.03 and arc angle of protrusions arrangement ranges from 45° to 75°. The maximum enhancement in heat transfer and friction factor is 2.89 and 2.93 times as compared with smooth duct. These experimental results have been used to develop correlations for Nusselt number and friction factor. © 2012 Elsevier Inc.


Gupta M.K.,Its Engineering College | Niyogi R.,Indian Institute of Technology Roorkee | Misra M.,Indian Institute of Technology Roorkee
Match | Year: 2014

In this paper, a new 2D graphical representation of protein sequences is proposed. The coordinates of twenty amino acids are confined to only the first quadrant. The assignment of coordinates to each of the twenty amino acids is based on their molecular weights. This graphical representation is used to construct the probabilistic distribution of protein sequences. The distribution corresponding to each protein sequence is then used to analyze the similarity by using the relative entropy (Kullback-Leibler divergence). The proposed method is tested on ND6 protein sequences taken from eight different species. The phylogeny shown by the method is in agreement with previous studies on the same dataset. The proposedmethod does not require any alignment of protein sequence as compared to traditional alignment methods. Moreover, our results are consistent with the alignment methods.


Pathak J.K.,Institute of Technology and Management | Singh A.K.,ITS Engineering College | Senani R.,Netaji Subhas Institute of Technology
IET Circuits, Devices and Systems | Year: 2011

A systematic approach is presented to realise quadrature oscillators using current differencing buffered amplifiers (CDBAs). Based on a general scheme employing a cascade of a special type of low-pass filter and an integrator in a closed loop, a general configuration is formulated that yields 12 single-resistor-controlled-quadrature oscillator circuits using CDBAs an active elements. All the oscillator circuits enjoy fully uncoupled independent control of condition of oscillation and frequency of oscillation using a minimum possible number of active components, grounded/virtually grounded capacitors and grounded/virtually grounded resistors. PSPICE simulation results along with hardware experimental results, based on commercially available AD844 ICs to construct the CDBAs, are included which confirm the practical workability of the new quadrature oscillator configurations. © 2011 The Institution of Engineering and Technology.


Mishra S.,Its Engineering College | Yadava V.,Motilal Nehru National Institute of Technology
Optics and Lasers in Engineering | Year: 2015

The use of short and ultrashort laser pulses for micromachining application is an emerging technology. Laser Beam MicroMachining (LBMM) has revolutionized many industries by providing innovative solutions in numerous industrial micro-engineering applications. High-intensity short or ultrashort laser pulses are powerful thermal energy source for creating micro-features in wide range of materials. These lasers can precisely ablate various types of materials with little or no collateral damage. An overview of LBMM is given so that we can obtain a current view of capabilities and tradeoffs associated with LBMM of sub-micron size. The fundamental understanding of ultrafast laser ablation process has been elucidated and the various research activities performed with nanosecond, picosecond and femtosecond, lasers have been discussed to understand the physical mechanisms and the critical experimental parameters involved in the LBMM. The critical analysis of various theoretical and experimental models used to describe the performance analysis of LBMM has been elaborated so that we can identify the relevant principles underlying the process. © 2015 Elsevier Ltd.


Yadav A.K.,ITS Engineering College
Plasmonics | Year: 2014

Current work demonstrates enhanced efficiencies in organic light-emitting diodes by using the localized surface plasmons originated from Au nanoclusters deposited using thermal evaporation technique. The effect of localized surface plasmons on organic emitter was studied using UV–vis absorption spectra, steady state and time-resolved photoluminescence spectra. These studies have revealed that the optical properties like absorption, emission have been greatly modified by the localized surface plasmon. These effects were found to be dependent on the distance between the emitter and Au layer. Further, efficiencies of the OLEDs were also found to be dependent on this distance. © 2014, Springer Science+Business Media New York.

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