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Shukla V.,Amity University | Singh O.P.,Amity University | Mishra G.R.,Amity University | Tiwari R.K.,Dr adh University Faizabad
Journal of Communications Software and Systems | Year: 2015

Reversible circuit designing is the area where researchers are focussing more and more for the generation of low loss digital system designs. Researchers are using the concept of Reversible Logic in many areas such as Nanotechnology, low loss computing, optical computing, low power CMOS design etc. Here we have proposed a novel design approach for a 2-bit binary Arithmetic Logic Unit (ALU) using optimized 8:1 multiplexer circuit with reversible logic concept [1]. This ALU circuit can perform complement, transfer, addition, subtraction, multiplication, OR, XOR, NAND functions on given values. The ALU circuit has been simulated on Modelsim tool and synthesised for Xilinx Spartan 3E with Device XC3S500E with 200 MHz frequency. This 2-bit ALU using reversible logic is useful for the designs of low power loss systems. © 2015 CCIS. Source

Saravanan R.,University of Madras | Saravanan R.,Dhanalakshmi College of Engineering | Joicy S.,University of Madras | Gupta V.K.,Indian Institute of Technology Roorkee | And 3 more authors.
Materials Science and Engineering C | Year: 2013

In the present study, the nanocatalysts CeO2, V 2O5, CuO, CeO2/V2O5 and CeO2/CuO were synthesized by thermal decompositionmethod. This method is simple, fast and cost effective comparedwith other preparationmethods. The synthesized catalysts were characterized by different techniques. The XRD and XPS results confirmed the structure and the oxidization states of the nanocomposite materials. DRS results suggested that the prepared CeO 2/V2O5 and CeO2/CuO nanocomposites can generate more electrons and holes under visible light irradiation. The photocatalytic activities of prepared catalysts were evaluated using the degradation of aqueous methylene blue solution as a model compound under visible light irradiation. In addition, the nanocomposite (CeO2/V 2O5 and CeO2/CuO) materials were employed to degrade the textile effluent under visible light condition. © 2013 Elsevier B.V. All rights reserved. Source

Sekaran G.,CSIR - Central Leather Research Institute | Karthikeyan S.,CSIR - Central Leather Research Institute | Boopathy R.,CSIR - Central Leather Research Institute | Maharaja P.,CSIR - Central Leather Research Institute | And 3 more authors.
Environmental Science and Pollution Research | Year: 2014

The rice-husk-based mesoporous activated carbon (MAC) used in this study was precarbonized and activated using phosphoric acid. N2 adsorption/desorption isotherm, X-ray powder diffraction, electron spin resonance, X-ray photoelectron spectroscopy and scanning electron microscopy, transmission electron microscopy, 29Si-NMR spectroscopy, and diffuse reflectance spectroscopy were used to characterize the MAC. The tannery wastewater carrying high total dissolved solids (TDS) discharged from leather industry lacks biodegradability despite the presence of dissolved protein. This paper demonstrates the application of free electron-rich MAC as heterogeneous catalyst along with Fenton reagent for the oxidation of persistence organic compounds in high TDS wastewater. The heterogeneous Fenton oxidation of the pretreated wastewater at optimum pH (3.5), H2O2 (4 mmol/L), FeSO4·7H2O (0.2 mmol/L), and time (4 h) removed chemical oxygen demand, biochemical oxygen demand, total organic carbon and dissolved protein by 86, 91, 83, and 90 %, respectively. © 2013 Springer-Verlag Berlin Heidelberg. Source

Gupta S.K.,Durban University of Technology | Chabukdhara M.,North Eastern Space Applications Center | Kumar P.,Durban University of Technology | Singh J.,Dr adh University Faizabad | Bux F.,Durban University of Technology
Ecotoxicology and Environmental Safety | Year: 2014

The aim of this study was to evaluate the extent of heavy metal pollution in river Gomti and associated ecological risk. River water, sediments and locally abundant mollusk (Viviparus (V.) bengalensis) were sampled from six different sites and analyzed for seven metals: Cadmium (Cd), Chromium (Cr), Copper (Cu), Manganese (Mn), Nickel (Ni), Lead (Pb) and Zinc (Zn). Mean metal concentrations (mg/l) in river water were 0.024 for Cd, 0.063 for Cr, 0.022 for Cr, 0.029 for Mn, 0.044 for Ni, 0.018 for Pb and 0.067 for Zn. In river sediments, the concentrations (mg/kg dry wt) were 5.0 for Cd, 16.2 for Cr, 23.2 for Cr, 203.2 for Mn, 23.9 for Ni, 46.2 for Pb and 76.3 for Zn, while in V. bengalensis mean metal concentrations (mg/kg, dry wt) were 0.57 for Cd, 12.0 for Cr, 30.7 for Cu, 29.9 for Mn, 8.8 for Ni, 3.6 for Pb and 48.3 for Zn. Results indicated elevated concentrations of Cu, Zn and Mn in V. bengalensis as compared to other non-essential elements. Potential ecological risk (RI) in sediments showed high to very high metal contamination. Cluster analysis indicated that Pb, Zn, Cd and Ni in sediments may have anthropogenic sources. The findings thus suggest heavy metal contamination of river water and sediments have reached alarming levels, which is well corroborated by elevated level of metal accumulation in V. bengalensis. © 2014 Elsevier Inc. Source

Gupta V.K.,Indian Institute of Technology Roorkee | Gupta V.K.,Dr adh University Faizabad | Yola M.L.,Dr adh University Faizabad | Yola M.L.,Sinop University | And 6 more authors.
Sensors and Actuators, B: Chemical | Year: 2013

A highly sensitive method for detection of DNA hybridization was developed. This method was based on the modification of glassy carbon electrode with gold nanoparticles (AuNPs) involving p-aminothiophenol (ATP) functionalized graphene oxide (GO). This GO was used as a platform for impedimetric genosensing using 5′-TA GGG CCA CTT GGA CCT-(CH2)3-SH-3′ single-stranded probe (ss-DNA), 5′-AGG TCC AAG TGG CCC TA-3′ (target DNA), 5′-SH-C6-TAG GGC CA-3′ (non-complementary-1) and 5′-SH-C6-TGC CCG TTA CG 3-′ (non-complementary-2) oligonucleotide sequences. The film exhibited excellent properties for immobilizing DNA probes and sensing DNA hybridization. The DNA immobilization and hybridization on the film were studied by cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS), and found that the charge transfer resistance (Rct) of the electrode increased with the concentration of the target DNA hybridized with the ss-DNA. The linear detection range was from 1.0 × 10-13 M to 1.0 × 10-7 M and the detection limit was 1.10 × 10-14 M (n = 6). Compared with the other electrochemical DNA biosensors, the proposed biosensor showed its own performance of simplicity, good stability, and high sensitivity. © 2013 Elsevier B.V. Source

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