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    ABSTRACT: Gold nanoparticles (AuNPs) were synthesized at room temperature using Neosartorya udagawae fungal mat isolated from Indian Kolar Gold Field mine soil. Swift extracellular formation of AuNPs occurred within few seconds by the fungal mat incubated with 6mM concentration of tetra chloroauric (III) acid. The UV-Visible spectrum, Scanning Electron Microscopy and Transmission Electron Microscopy confirmed the presence of AuNPs in solution in the size range of 50-75 nm and showed most of the particles in spherical shape. Fourier Transform Infrared spectroscopy analysis showed that amino acids present in protein molecules on fungal mat surface were involved in reducing, capping and stabilization of synthesized AuNPs. X-ray diffraction revealed crystalline nature of bio reduced AuNPs. Toxicity study in animals showed almost nil toxicity. Fungal synthesized AuNPs were well tolerated and non-toxic.
    No preview · Article · Oct 2015 · Research journal of biotechnology
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    ABSTRACT: Purpose: The purpose of this paper is to present the Switched Inductor Z-Source Inverter (SLZSI) topology for three-phase on-line uninterruptible power supply (UPS) by employing third harmonic injected maximum constant boost pulse width modulation (PWM) control. Conventional UPS consists of step-up transformer or boost chopper along with voltage source inverter (VSI) which reduces the efficiency and increases energy conversion cost. The proposed three-phase UPS by using SLZSI has the voltage boost capability through shoot through zero state which is not available in traditional VSI and current source inverter. Design/methodology/approach: Performance of three-phase on-line UPS based on ZLZSI by using third harmonic injected maximum constant boost PWM control is analyzed and evaluated in MATLAB/Simulink software and the results are compared with Z-source inverter (ZSI) fed UPS. Experimental results are presented for the validation of the simulation and theoretical analysis. Findings: The output voltages, currents, THD values, voltage stress and efficiencies for different loading condition are determined and compared with the theoretical values and UPS with ZSI. The experimental results validate the theoretical and simulation results. Originality/value: Compared with the traditional ZSI, the SLZSI provides high-voltage boost inversion ability with a very short shoot through zero state. This proposed UPS by using SLZSI increases the efficiency with less number of components, reduces the harmonics, increases the voltage gain and reduces the voltage stress.
    No preview · Article · Jul 2015 · COMPEL International Journal of Computations and Mathematics in Electrical
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    ABSTRACT: A novel series of linear supramolecular hydrogen bonded liquid crystals (SMHBLC) has been investigated. Complimentary hydrogen bonds are formed between various alkyloxy benzoic acids. Formation of hydrogen bond is confirmed by FTIR spectroscopic studies. These homologs exhibit rich phase variance as evinced by various textures by polarizing optical microscopic (POM) studies. DSC studies revealed the transition temperatures and corresponding enthalpy values which are elucidated from the DSC thermograms. Phase diagram has been constructed through POM and DSC data. An interesting finding is the observation of a new smectic ordering labeled as smectic X. This phase has been characterized by various techniques which includes XRD. Optical tilt angle in smectic C and smectic X phases of various homologs has been measured and fitted to a power law. Dielectric relaxations have been carried out in nematic and smectic C phases of different mesogens and their activation energies are calculated. An interesting observation is the optical shuttering action of the mesogens in the nematic phase. In addition to the above phenomenon the light filtering action of these mesogens in the nematic phase has been studied.
    Full-text · Article · Jun 2013 · Journal of Molecular Liquids

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International Journal of Electrical Power & Energy Systems 11/2012; 42(1):685–692. DOI:10.1016/j.ijepes.2012.04.061
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