Banasthali VidyapithRajasthan

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Banasthali VidyapithRajasthan

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Dhillon A.,Banasthali VidyapithRajasthan | Prasad S.,University of The South Pacific | Kumar D.,Banasthali VidyapithRajasthan
Applied Spectroscopy Reviews | Year: 2017

With the constant rising demand for pure water to meet the needs of the growing population particularly in developing countries, fluoride remediation from drinking water has emerged as an increasingly important matter of public concern. In the past decade, significant efforts and advances have been made for developing efficient adsorbents for fluoride removal from water. This review summarizes recent advances (2012–2016) in defluoridation techniques and highlights the challenges and opportunities for future research in the important field of fluoride removal. The spectroscopic techniques, used to develop adsorbents/adsorption mechanism, discussed in this review are X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, inductively coupled plasma mass spectrometry, atomic absorption spectrometry, inductive coupled plasma-optical emission spectroscopy, and X-ray photoelectron spectroscopy. The defluoridation techniques have been discussed in four categories: precipitation, membrane, ion-exchange, and adsorption techniques. Then recent research on fluoride removal using various adsorbents with their spectroscopic studies are summarized and discussed with regard to their synthetic chemistry, properties, and applications. The advantages and disadvantages of defluoridation techniques and adsorbents have been presented. Finally, the future needs and perspectives of fluoride removal are addressed. © 2017 Taylor & Francis Group, LLC.


Mishra S.,Indian Institute of Technology Kanpur | Dwivedi J.,Banasthali VidyapithRajasthan | Kumar A.,Bhabha Atomic Research Center | Sankararamakrishnan N.,Indian Institute of Technology Kanpur
New Journal of Chemistry | Year: 2016

Carbon nanotubes (CNTs) were synthesized by the floating catalytic chemical vapor deposition technique using ferrocene in benzene as the hydrocarbon source. The functionalization of CNTs was carried out by oxidation (CNT-OX) and grafting with a tributyl phosphate (TBP) ligand (CNT-TBP). Various spectroscopic techniques including scanning electron microscopy (SEM), Fourier Transform Infra Red Spectroscopy (FTIR), BET surface area and X-ray photoelectron spectroscopy (XPS) were used to characterize the adsorbents. FTIR and XPS studies revealed the efficient grafting of the TBP ligand on the CNT surface. The effect of the initial pH and the contact time for the maximum adsorption of U(vi) with CNT-plain, CNT-OX and CNT-TBP was studied. The spontaneity of the sorption was confirmed by thermodynamic data. A pseudo second order model with a regression coefficient of >0.978 was obtained for CNT-TBP and equilibrium was reached within 3 h. The Langmuir maximum adsorption capacity of U(vi) at pH 5 for CNT, CNT-OX and CNT-TBP was found to be 66.6, 100.0 and 166.6 mg g-1 respectively. Using 0.1 M HCL as a desorbent, recyclability studies were carried out for three cycles. The probable mechanism of adsorption between U(vi) and CNT-TBP could be understood through FTIR and XPS techniques. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2016.


Gautam R.,Krishna Institute of Engineering and Technology | Singh P.,Krishna Institute of Engineering and Technology | Sharma S.,Swami Premanand Mahavidyalaya | Kumari S.,University of Rajasthan | Verma A.S.,Banasthali VidyapithRajasthan
Materials Science in Semiconductor Processing | Year: 2015

The ab initio calculations were performed for CdGeP2 chalcopyrite in the body centered tetragonal (BCT) phase in an attempt to calculate the structural, electronic and optical properties by linearized augmented plane wave (LAPW) method as implemented in the WIEN2K. Furthermore, optical features such as dielectric functions, refractive indices, extinction coefficient, optical reflectivity, absorption coefficients, optical conductivities, were calculated for photon energies up to 40 eV. The six elastic constants (C11, C12, C13, C33, C44 and C66) and mechanical parameters were presented and compared with the available experimental data. The thermodynamic calculations within the quasi-harmonic approximation is used to give an accurate description of the pressureerature dependence of the thermal-expansion coefficient, bulk modulus, specific heat, Debye temperature, entropy and Grüneisen parameters. Based on the semi-empirical relation, we have determined the hardness of the materials for the first time at different pressure (0-8 GPa) and temperature (0-1000 K). Further, CdGeP2 solar cell devices have been modeled; device physics and performance parameters are analyzed for zinc chalcogenides (ZnX; X=S, Se, Te) buffer layers. Simulation results for CdGeP2 thin layer solar cell show the maximum efficiency (22.6%) with ZnSe as the buffer layer. © 2015 Elsevier Ltd. All rights reserved.


Gautam R.,Krishna Institute of Engineering and Technology | Singh P.,Krishna Institute of Engineering and Technology | Sharma S.,Swami Premanand Mahavidyalaya | Kumari S.,University of Rajasthan | Verma A.S.,Banasthali VidyapithRajasthan
Superlattices and Microstructures | Year: 2015

Abstract First principles calculations were performed by the linearized augmented plane wave (LAPW) method as implemented in the WIEN2K code within the density functional theory to obtain the structural, electronic and optical properties for CdSnP2 in the body centered tetragonal (BCT) phase. Furthermore, optical features such as dielectric functions, refractive indices, extinction coefficient, optical reflectivity, absorption coefficients, optical conductivities, were calculated for photon energies up to 40 eV. The six elastic constants (C11, C12, C13, C33, C44 and C66) and mechanical parameters were presented and compared with the available experimental data. The thermodynamic calculations within the quasi-harmonic approximation is used to give an accurate description of the pressure-temperature dependence of the thermal-expansion coefficient, bulk modulus, specific heat, Debye temperature, entropy and Grüneisen parameters. Further, CdSnP2 solar cell devices have been modeled; device physics and performance parameters are analyzed for zinc chalcogenides (ZnX; X = S, Se) buffer layers. Simulation results for CdSnP2 thin layer solar cell show the maximum efficiency (15.15%) with ZnSe as the buffer layer. Most of the investigated parameters are reported for the first time. © 2015 Elsevier Ltd.


Verma A.S.,Banasthali VidyapithRajasthan | Gautam R.,Banasthali VidyapithRajasthan | Gautam R.,Krishna Institute of Engineering and Technology | Singh P.,Banasthali VidyapithRajasthan | And 3 more authors.
Materials Science and Engineering B: Solid-State Materials for Advanced Technology | Year: 2016

The first principles calculations were performed by the linearized augmented plane wave (LAPW) method as implemented in the WIEN2K code within the density functional theory to obtain the structural, electronic and optical properties of CdSiP2 in the body centered tetragonal (BCT) phase. The six elastic constants (C11, C12, C13, C33, C44 and C66) and mechanical parameters were presented and compared with the available experimental data. The thermodynamic calculations within the quasi-harmonic approximation is used to give an accurate description of the pressure-temperature dependence of the thermal-expansion coefficient, bulk modulus, specific heat, Debye temperature, entropy Grüneisen parameters and hardness. Further, CdSiP2 solar cell devices have been modeled; device physics and performance parameters are analyzed for zinc chalcogenide (ZnX; X = Se, Te) buffer layers. Simulation results for CdSiP2 thin layer solar cell show the maximum efficiency (25.7%) with ZnSe as the buffer layer. © 2015 Elsevier B.V. All rights reserved.


Singh P.,Banasthali VidyapithRajasthan | Gautam R.,Banasthali VidyapithRajasthan | Sharma S.,Smdrsd Collegepunjab | Kumari S.,University of Rajasthan | Verma A.S.,Banasthali VidyapithRajasthan
Materials Science in Semiconductor Processing | Year: 2016

We have performed ab-initio calculations for the structural, electronic, optical, elastic and thermal properties of the copper gallium chalcopyrite (CuGaSe2). The Full Potential Linearized Augmented Plane Wave (FP-LAPW) method is used to find the equilibrium structural parameters and to compute the full elastic tensors. We have reported electronic and optical properties with the recently developed density functional of Tran and Blaha. Furthermore, optical features such as dielectric functions, refractive indices, extinction coefficient, optical reflectivity, absorption coefficients, optical conductivities, are calculated for photon energies up to 30 eV. The thermodynamical properties such as thermal expansion, heat capacity, Debye temperature, entropy and Grüneisen parameter, bulk modulus and hardness are calculated employing the quasi-harmonic Debye model at different temperatures (0-1200 K) and pressures (0-8 GPa) and the silent results are interpreted. To check the potentiality of CuGaSe2 as future solar cell material, device modeling and simulation studies have been carried out with a variety of buffer layers over CuGaSe2 absorption layer. The band diagram and J/V curves are analyzed and device performance parameters i.e. efficiency, open circuit voltage, short circuit current, quantum efficiency are calculated for CdS, ZnS and ZnSe buffer layers. Simulation results for CuGaSe2 thin layer solar cell show the maximum efficiency (15.8%) with ZnSe as the buffer layer. Most of the investigated parameters are reported for the first time. © 2015 Elsevier Ltd. All rights reserved.


Sonah H.,Banasthali VidyapithRajasthan | Sonah H.,Laval University | Chavan S.,SRTM University | Katara J.,Indian Central Rice Research Institute | And 5 more authors.
Indian Journal of Genetics and Plant Breeding | Year: 2016

Xylanase inhibitor proteins (XIPs) have been reported to be involved in plant defense mechanisms, more predominantly against fungal pathogens. XIPs have mostly been well characterized in model plant species, and very little is known about their distribution, organization and evolution in cereals. In the present study, we have identified XIPs in four cereal plant species, including three major crops sorghum, maize, rice and a model species Brachypodium. The genome-wide analysis identified 10, 20, 13 and 31 XIP genes respectively for Brachypodium, sorghum, maize and rice. The number of identified genes is in well accordance with the genome size except for maize. Interestingly, most of the XIP genes were observed to be intron-less, and clustered together on the chromosomes. The XIP genes organization is much similar to the lower eukaryotes and fungi suggesting the possibility of horizontal gene transfer from the pathogen. The phylogenetic analysis of XIP revealed two major groups, and minor subgroups mostly representing gene clusters. Gene expression evaluation using publically available data suggested LOC_Os11g47500 and LOC_Os11g47510are candidate genes for resistance against Magnaporthe grisea pathogen in rice. The information provided here would be helpful for the identification of candidate resistance genes in other cereals. © 2016, Indian Society of Genetics and Plant Breeding. All rights reserved.


Jailia M.,Banasthali VidyapithRajasthan | Kumar A.,Banasthali VidyapithRajasthan | Singhal H.,Banasthali VidyapithRajasthan | Agarwal M.,Banasthali VidyapithRajasthan
ACM International Conference Proceeding Series | Year: 2016

In the modern era web applications have become such a prevalent phenomenon. In past days Web applications region are broadly not known and it is extremely not understandable fixed appliance due to its complex nature and it is highly technical. Nowadays with the help of web application we can express, manage, depot and transmit the delicate consumer data for instant and frequent use. Some Web applications take a few seconds and other take huge amount of time to display the results. The work has been done to enhance the performance of Web applications. Mainly this paper focuses on making a comparison between Model View Controller and Cloud architecture. This also includes the implementation of web application with CRUD functionality with different architectures. © 2016 ACM.

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