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Articles by Vandana Sharma
Total Records ( 3 ) for Vandana Sharma
  Vandana Sharma , Satwinder Singh and K.S. Kahlon
  Problem statement: Several efficient algorithms were developed to cope with the popular task of sorting. Improved heap sort is a new variant of heap sort. Basic idea of new algorithm is similar to classical Heap sort algorithm but it builds heap in another way. The improved heap sort algorithm requires nlogn-0.788928n comparisons for worst case and nlogn-n comparisons in average case. This algorithm uses only one comparison at each node. Hardware has impact on performance of an algorithm. Since improved heap sort is a new algorithm, its performance on different hardware is required to be measured. Approach: In this comparative study the mathematical results of improved heap sort were verified experimentally on different hardware. To have some experimental data to sustain this comparison five representative hardware were chosen and code was executed and execution time was noted to verify and analyze the performance. Results: Hardware impact was shown on the performance of improved heap sort algorithm. Performance of algorithm varied for different datasets also. Conclusion: The Improved Heap sort algorithm performance was found better as compared to traditional heap sort on different hardware, but on certain hardware it was found best.
  K. V. Sharma , Vandana Sharma and U. N. Tripathi
  A number of complexes of nickel(II) with 5(2′-hydroxyphenyl)-3-(4-X-phenyl)pyrazolines of the type (C15H12N2O ··· X)2Ni [where X = H, Cl, CH3 and OCH3] were synthesized by the reaction of anhydrous nickel(II) chloride with sodium salts of pyrazoline in 1 : 2 molar ratio. Their addition complexes with 2,2′-bipyridine, 1,10-phenanthroline and triphenylphosphine were prepared in 1 : 1 molar ratio. These complexes were characterized by elemental analyses, molecular weight, magnetic, conductivity, IR, electronic, 1H, 13C, 31P NMR and FAB mass spectral data. All complexes are amorphous. Square planar geometry around nickel confirms the presence of two bidentate pyrazoline ligands in nickel(II)5(2′-hydroxyphenyl)-3-(4-X-phenyl)pyrazolinates. In the addition complexes pyrazoline is monodentate. Bidentate and monodentate pyrazoline was confirmed by IR, 1H, 13C and 31P NMR spectral data. All the metal complexes exhibit very good antibacterial and antifungal activity. Coordination of metal ion has pronounced effect on the microbial activities of the ligand. The brine shrimp bioassay was also carried out to study their in vitro cytotoxic properties; all complexes and adducts display potent cytotoxic activity against Artemia salina.
  Smita Chaudhry , Jyoti Luhach , Vandana Sharma and Chetan Sharma
  Application of micro organisms for effective removal of hydrocarbon contamination from soil has been considered by several workers since decontamination of polluted soil by other methods leads to production of toxic compounds and these techniques are non-economic also. In the present study, soil samples from five different petroleum sludge contaminated sites were studied for assessment of their diesel degrading potential. The average heterogeneous fungal count in different soil samples ranged from 35.67±5.69 to 51.33±7.64 and the average count of diesel utilizing fungi ranged from 3.33±1.15 to 26.00±4.00. Total heterogeneous fungal count and diesel utilizing fungal count varied significantly in sludge production and disposal site, as compared to control soil. Thirteen native fungi species of six fungal genera were isolated from different soil samples. The identified fungal genera included Aspergillus, Fusarium, Cladosporium, Penicillium, Rhizopus and Alternaria. Biodegradation ability of all isolates was confirmed by shake flask culture and vapour phase transfer method. The results showed that indigenous fungal isolates Aspergillus sp., Alternaria sp., Penicillium sp. and Fusarium sp. displayed highest capability for biodegradation of diesel. Hence, these fungal species can be used for bioremediation of sludge and diesel contaminated sites.
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