H A Yousef

Publications (4)0 Total impact

• Article: Robust flight control system design using H

  A. A. El-Mahallawy, H. A. Yousef, M. I. El-Singaby, A. A. Madkour, A. M. Youssef
  Expert Syst. Appl. 01/2011; 38:169-174.
• Article: Partial characterization of acidic proteinase in the midgut of Parasarcophaga surcoufi larvae (Diptera: Sarcophagidae).

  M A Dorrah, H A Yousef, T T Bassal
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  ABSTRACT: Activity of acidic proteinase in the midgut of larval Parasarcophaga surcoufi was investigated and partially characterized. Larval midgut extract showed a moderate acidic pH (pH 4) optimum for hydrolysis of haemoglobin. The proteolytic activity of the larval midgut was estimated by hydrolysis of haemoglobin, and was found to be inhibited by pepstatin (aspartic proteinase inhibitor), dithiothreitol (DTT) and mercaptoethanol; while it was not inhibited by the soybean trypsin inhibitor (STI) and EDTA. These characteristics may imply that cathepsin D-like proteinase is an effective acidic proteinase present in the Parasarcophaga surcoufi larval midgut.
  Journal of the Egyptian Society of Parasitology 09/2000; 30(2):643-53.
• Article: Effect of bioresmethrin on mitochondrial ultrastructure and oxidative phosphorylation in the flight muscles of Chrysomya albiceps (Wied.) (Diptera: Calliphoridae).

  H A Yousef, Shaurub el-SH
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  ABSTRACT: The sublethal effect of bioresmethrin on the ultrastructure, oxidation and phosphorylation of flight muscle mitochondria in the blow fly Chrysomya albiceps which survived treatment of newly formed pupae (0-day old) with 10 micrograms/pupa (LD30) was studied. The ultrastructure of the flight muscle mitochondria was severely deteriorated by treatment with bioresmethrin. The deterioration included disalignment and sometimes destruction of the cristae and vacuolation of mitochondria. The oxidation rate was decreased in treated flies, although the P/O ratio was increased. The present study may indicate that bioresmethrin is neither an uncoupler nor a direct inhibitor of oxidative phosphorylation but may have functioned as an inhibitor of the oxidation rate.
  Journal of the Egyptian Society of Parasitology 01/1999; 28(3):645-54.
• Article: Robust flight control system design using H∞ loop-shaping and recessive trait crossover genetic algorithm

  A.A. El-Mahallawy, H.A. Yousef, M.I. El-Singaby, A.A. Madkour, A.M. Youssef
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  ABSTRACT: A proposed approach to robust controller design is introduced. This approach combines the recessive trait crossover genetic algorithm with the loop-shaping design procedure using H∞ synthesis. The requirements, design and simulation of a flight control system for precision tracking task are considered. The proposed method is applied to design a control system for the F-16 fighter aircraft model. The flight simulations reveal that the desired performance objectives are achieved and that the controller provides acceptable performance in spite of modeling errors and plant parameter variations.
  Expert Systems with Applications.