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This study presents a circuit theory approach for voltage stability assessment in an interconnected power network. Here, an interconnected IEEE 14-bus network has been reconfigured into 12-, 10-and 8-bus networks using graph theory. The line index indicator has been used for voltage stability assessment under normal and faulted conditions for the original (IEEE 14-bus) and the reconfigured (12-, 10-and 8-bus) networks. Genetic algorithm tool in MATLAB has been used to determine the optimal operating condition with best voltage stability for the original and the reconfigured networks. The results have shown that the voltage stability assessment under normal and faulted conditions can be effectively determined for the reconfigured networks compared with the original network.

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Larvae of two Indian strains of Anopheles stephensi were highly susceptible to chlorpyrifos, temephos, dichlorvos, fenitrothion, fenthion and malathion but not to carbamates, DDT and y-HCH. Both strains upon continuous and intense larval selection under laboratory conditions, developed high level of resistance to malathion and moderate levels to fenitrothion, fenthion, and' temephos. However, selection with propoxur did not produce resistance in both strains. Larval selection could not induce any tolerance in adults. In general, selection with op-compounds induced cross-tolerance to other op-compounds, organochlorines and carbamates. Malathion-selection caused high cross resistance to fenitrothion while, fenitrothion selection produced high cross-resistance to malathion.