Shri Shankaracharya Engineering College

Bhilai, India

Shri Shankaracharya Engineering College

Bhilai, India
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Shrivastava R.,Shri Shankaracharya Engineering College
Bulletin of Materials Science | Year: 2015

Tin (Sn)-doped cadmium zinc sulphide nanoparticles (CdZnS: Sn) were synthesized by the chemical bath deposition method with two different concentrations of Sn (2 and 4 mol%). X-ray diffraction (XRD) pattern reveals the formation of CdZnS nanoparticles with cubic and hexagonal structure. It was observed that the presence of Sn does not alter the structure of CdZnS. Average crystallite size was measured from XRD data by using Scherrer's formula. From the study of absorption spectra, band-to-band absorption was obtained at 460 and 490 nm, respectively, for the Sn-doped (2 and 4 mol%) CdZnS nanoparticles. Energy bandgap for undoped and Sn-doped CdZnS varies from 3.5 to 2.9 eV with error ± 0.05 eV. The presence of Sn was confirmed by energy-dispersive X-ray analysis. The effect of dopant concentration on the photoluminescence (PL) intensity has also been studied. The PL emission peak has been observed at 540, 550 and 560 nm for the Sn-doped (CdZnS, CdZnS 2 mol% and CdZnS 4 mol%), respectively, nanoparticles. XRD and PL analyses demonstrate that the Sn2+ ions uniformly substitute Cd2+ sites or interstitial sites in CdZnS lattice, which influence the optical properties. Increase in the concentration of Sn shifts the UV-vis absorption spectra and PL emission spectra towards higher wavelength side. Particle size and the crystallinity of CdZnS: Sn nanoparticles were confirmed through atomic force microscopy. © 2015 Indian Academy of Sciences.


Shrivastava R.,Shri Shankaracharya Engineering College | Singh R.S.,Government D T College | Singh A.K.,Government Vyt Pg Autonomous College
Materials Research Express | Year: 2015

In this paper, a comparative study of CdZnS nano-crystalline films with two different capping agents, CTAB and TSC, deposited by chemical bath deposition method has been made using x-ray diffraction, scanning electron microscope, transmission electron microscopy and atomic frequency microscopy. The structure of CdZnS nano-crystalline films with capping agents CTAB and TSC was observed by XRDtechnique and found to be both hexagonal and cubic. SEM micrographs show the cabbage-like structure of CdZnS nano-crystalline films when prepared in the presence of capping agents. TheAFM image shows the presence of nanorods in the samples. TheTEMdiffraction pattern indicates a nanocrystalline structure with the presence of various crystal planes. Elemental analysis has also been made and it has been found that no impurity was present in the film. © 2015 IOP Publishing Ltd.


Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology | Chandra A.,Shri Shankaracharya Engineering College | Thakur S.S.,Shri Shankaracharya Engineering College | Chakrawarti V.,Swami Swarupanand Institute of Education
AIP Conference Proceedings | Year: 2011

Ionic drift velocity (vd) measurements on a hot-press synthesized nano-composite polymer electrolyte (NCPE) membrane: 95[90PEO: 10AgNO3]: 5SiO2, are reported. The ionic transference number (tion) values were determined using dc polarization Transient Ionic Current (TIC) technique for vd measurement at different temperatures. The drift energy (Ed), involved in the thermally activated process was determined from the temperature dependent studies on ionic drift velocity using the log vd vs 1/T Arrhenius plot. At all the temperatures, the ionic drift velocity is directly proportional to the ionic mobility (μ) at a fixed value of applied dc potential. © 2011 American Institute of Physics.


Gupta N.,Government Vyt Pg Autonomous College | Pillai A.K.,Government Vyt Pg Autonomous College | Parmar P.,Shri Shankaracharya Engineering College
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2015

A novel, sensitive, selective and simple kinetic spectrophotometric method has been developed for determination of trace levels of carbaryl based on its inhibitory effect on the oxidation of rhodamine-B by chlorine and bromine released from reaction of potassium bromate with hydrochloric acid in micellar medium. A linear relationship was observed between the inhibitory effect and the concentration of the compound. The absorbance was monitored at the maximum wavelength of 555 nm. The effect of different parameters such as pH, temperature and concentration of rhodamine-B, potassium bromate and surfactant on the reaction were investigated and optimum conditions were established. Under the selected experimental conditions, carbaryl was determined in the range of 0.04-0.4 μg mL-1. Sandell's sensitivity and molar absorptivity were found to be 0.00055 μg cm-2 and 3.658 × 105 L mol-1 cm-1 respectively. The proposed method was applied satisfactorily for the determination of carbaryl in water and different grain samples. The results were compared with those obtained by reference method and were found to be in agreement. © 2014 Elsevier B.V. All rights reserved.


Meshram C.,Shri Shankaracharya Engineering College | Meshram S.A.,Rashtrasant Tukadoji Maharaj Nagpur University | Zhang M.,Kyushu University
Information Processing Letters | Year: 2012

In 1984, Shamir introduced the concept of an identity-based cryptosystem. In this system, each user needs to visit a key authentication center (KAC) and identify himself before joining a communication network. Once a user is accepted, the KAC will provide him with a secret key. In this way, if a user wants to communicate with others, he only needs to know the identity of his communication partner and the public key of the KAC. There is no public file required in this system. However, Shamir did not succeed in constructing an identity-based cryptosystem, but only in constructing an identity-based signature scheme. In this paper, we propose an ID-based cryptosystem under the security assumptions of the generalized discrete logarithm problem and integer factorization problem. We consider the security against a conspiracy of some entities in the proposed system and show the possibility of establishing a more secure system. © 2012 Elsevier B.V.


Meshram C.,Shri Shankaracharya Engineering College | Meshram S.A.,Rashtrasant Tukadoji Maharaj Nagpur University
Proceedings of the 2011 7th International Conference on Information Assurance and Security, IAS 2011 | Year: 2011

In a modern open network system, data security technologies such as cryptosystems, signature schemes, etc., are indispensable for reliable data transmission. In particular, for a large-scale network, ID-based systems such as the ID-based cryptosystem, the ID-based signature scheme, or the ID-based key distribution system are among the better countermeasures for establishing efficient and secure data transmission systems. The concept of an ID-based cryptosystem has been proposed by Shamir [1], and it is advantageous to public-key cryptosystems because a large public-key file is not required for such a system. This paper proposes an ID-based beta cryptosystem under the security assumptions of the generalized discrete logarithm problem and integer factorization problem, which is one of the earliest realizations in Shamir's sense. Furthermore, we consider the security against a conspiracy of some users in the proposed system, and show the possibility of establishing a more secure system. © 2011 IEEE.


Moyal V.,Bhilai Institute of Technology | Tripathi N.,Shri Shankaracharya Engineering College
Proceedings of the 2016 IEEE International Conference on Wireless Communications, Signal Processing and Networking, WiSPNET 2016 | Year: 2016

A novel Threshold Inverter Quantizer (TIQ) is suggested in the work to implement a 3-bit, 1.2V Flash Analog to Digital Converter (ADC). Two Phase Adiabatic Static CMOS Logic (2PASCL) is used for designing of Threshold Inverter Quantizer (TIQ) Comparator. Suggested work is carried out with SMIC 65nm Technology and simulated on Empyrean EDA tool. There is a need of different reference voltage for operation of comparator and this is achieved by systematically sizing the transistors of the TIQ comparators. The total power dissipation for the proposed ADC simulated at 1.2V Vdd and for 1fF capacitive load at 1.2 Hz, 1 KHz, 1 MHz input frequency is observed as 1.69 μW, 1.79 μW, 2.26 μW respectively; which is about 89% lesser than that of conventional CMOS TIQ based Flash ADC design. © 2016 IEEE.


Goswami G.K.,Kalyan Post Graduate College | Yadav A.K.,Galgotias University | Mishra M.,Shri Shankaracharya Engineering College
International Journal of Theoretical Physics | Year: 2014

In the present work, we have searched the existence of ΛCDM-type cosmological model in anisotropic Heckmann-Schucking space-time. The matter source that is responsible for the present acceleration of the universe consist of cosmic fluid with p = ωiρ, where ωi is the equation of state parameter for different cosmic fluids. The Einstein’s field equations have been solved explicitly under some specific choice of parameters that isotropizes the model under consideration. It has been found that the derived model is in good agreement with recent SN Ia observations. Some physical aspects of the model has been discussed in detail. © 2014, Springer Science+Business Media New York.


Meshram C.,Shri Shankaracharya Engineering College
Asian Journal of Information Technology | Year: 2011

In 1984, Shamir introduced the concept of an identity-based cryptosystem. In this system, each user needs to visit a Key Authentication Center (KAC) and identify him self before joining a communication network. Once a user is accepted, the KAC will provide him with a secret key. In this way if a user wants to communicate with others he only needs to know the identity of his communication partner and the public key of the KAC. There is no public file required in this system. However, Shamir did not succeed in constructing an identity based cryptosystem but only in constructing an identity-based signature scheme. Meshram and Agrawal have proposed an id-based cryptosystem based on double discrete logarithm problem which uses the public key cryptosystem based on double discrete logarithm problem. In this study, we propose the modification in an id based cryptosystem based on the double discrete logarithm problem and we consider the security against a conspiracy of some entities in the proposed system and show the possibility of establishing a more secure system. © Medwell Journals, 2011.


Chandra A.,Shri Shankaracharya Institute of Professional Management and Technology | Chandra A.,Shri Shankaracharya Engineering College | Thakur S.S.,Shri Shankaracharya Engineering College
Indian Journal of Pure and Applied Physics | Year: 2011

The electrical and electrochemical properties of PEO-based hot-pressed nano-composite polymer electrolyte (NCPE) membranes: (1-x) [70PEO:30KBrO 3]:xSiO2, where x = 0-20 wt. (%), have been studied. NCPE membranes have been casted using a novel hot-press technique in place of the traditional solution cast method. The conventional Solid Polymer Electrolyte (SPE) composition: (70PEO: 30KBrO3), identified as the highest conducting film at room temperature, has been used as Ist-phase host matrix and nano-size (∼8 nm) particles of SiO2 as II nd-phase dispersoid. As a consequence of dispersal of SiO2 in SPE host, a conductivity enhancement of an order of magnitude was achieved in NCPE film: [95(70PEO:30KBrO3):5SiO2]. This composition has been referred to as Optimum Conducting Composition (OCC). Materials characterization has been done with the help of SEM and DSC techniques. The ion transport behaviour in NCPE membranes have been discussed on the basis of conductivity (σ), mobility (μ), mobile ion concentration (n) and ionic transference number (tion) studies. The temperature dependent conductivity studies have also been done to compute the activation energy (Ea) values by least square linear fitting of 'logσ-1/T' Arrhenius plots. Thin film solid-state polymeric batteries were fabricated using NCPE OCC as electrolyte and the cell-potential discharge characteristics were studied under different load conditions.

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