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Two aquatic floating plants of Lemnaceae species were selected, viz., Lemna gibba and Lemna minor to examine their potential to bioremediate toxic metals from polluted water of studied lake. Toxic metals chosen were cadmium, cobalt, copper, nickel, lead and zinc monitored in water, sediment and roots and leaves of the abovesaid plants. The quantity of toxic metals in water, sediment and the tissues of plants were exploited to evaluate the bioconcentration factor, transfer factor value and enrichment coefficient value. The strength and dangerous condition noted in the examined aquatic plants, the six toxic metals were arranged in the order of Zn > Pb > Cd > Cu > Ni > Co. Bioconcentration factor value lies 1.47 to 8.97 for Lemna gibba and 1.38 to 8.67 for Lemna minor. Thus, both these plants showed their broad range of tolerance to all the evaluated metals, which recommends the application of these plants for industrial scale of heavy metal removal. [ABSTRACT FROM AUTHOR]

The wear behaviour of hot pressed AA 2618 aluminium alloy matrix composites reinforced through nano Si3N4 elements (1 percent and 2 percent) has been investigated in this paper. Temperatures of 50°C, 150°C, and 250°C were used to examine the tribological characteristics of the models under a range of loads and pressures. The best wear performance was found in AA 2618/2wt percent Si3N4. Under a load of 30 N and temperature of 250°C, it was discovered that Si3N4-enriched AA 2618 alloy was 35.7% more wear-resistant than unreinforced AA 2618 alloy. Metal flow and plain delamination were the most common wear mechanisms at higher temperatures. Delamination is the most common wear mechanism at temperatures between 50 and 250 degrees Celsius. In the analysis of variance, the wear rate was influenced by temperature, load, and the presence of Si3N4 by 47.2%. In order to predict the wear rate, regression equations (linear and nonlinear) were developed by Taguchi method. Using a high determination coefficient, the nonlinear regression was the preeminent success rate (92.8 percent). [ABSTRACT FROM AUTHOR]