The biological effects of entomopathogenic species, Beauveria bassiana (Bals.-Criv.) Vuill and Akanthomyces attenuatus Zare & Gams on cotton aphid, Aphis gossypii Glover (Hemiptera: Aphididae) nymphs at 1x108 conidia concentration (ml-1) were investigated the laboratory conditions. experiments conducted 25°C, 65% relative humidity, 16:8 hours lighting in a climatic cabinets. Alive recor...

In this paper we give a compact derivation of new for-mulae for the synthesis of H 1 , sampled-data controllers for continuous-time, linear, time-invariant, generalised plants. The formulae are signiicantly more simple than those previously published and accommodate a direct feedthrough term from the disturbance inputs to the controlled outputs of the generalised plant. Furthermore, motivated b...

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