Ezz El -Dien, N. M., M. S. Abd El-Rahman, E. A. E. Imam, M. M. Fahmy, and H. M. A. El-Gawady,
"Incidence of the enteric helminth parasites of marine water fishes in Suez Canal area, Egypt. ",
J. Egypt. Vet. Med. Ass. , vol. 50, issue 4, pp. 497-506., 1990.
Al Masry, A. A., A. M. Abdel Gwad, and A. S. Nassar,
"isolation of Toxoplasma gondii, Isospora felis and Isospora revolta. from sheep, goats and chicken in Egypt",
J.Egypt.Vet.Ass., vol. 2, issue 50, pp. 275-284, 1990.
Totonji, A., N. El-Khatib, M. Dokla, and M. H. Sayyouh,
Laboratory and numerical investigation of enhanced recovery for Saudi oil fields by surfactant and polymer flooding,
, Saudi Arabia , Published by King Abduylaziz City for Science and Technology, SANCST, 1990.
Taha, M., A. A. Mahmoud, and M. Nassar,
"Mathematical Treatment of a Single Pile In Non homogeneous Soils",
J. Eng. and Applied Science, Cairo Univ, vol. 40, issue 3, pp. 445-458 , 1990.
Elansary, A. S., and D. N. Contractor,
"Minimization of stresses and pressure surges",
Journal of Pressure Vessel Technology, vol. 112, issue 3, pp. 311-316, 1990.
AbstractThe control of stresses and liquid pressure surges in pipes is an important problem in the design of hydraulic pipe networks. The method of characteristics has been used to solve the transient stresses and pressures in liquid-filled piping systems. The friction force is included in the equation of motion for the fluid and the pipe wall. The maximum pressure and maximum stress at any point along the length of the pipe are evaluated for the entire simulation time. The Von Mises criterion is used for the stress calculation. A nonlinear search technique has been developed using the simplex method. The optimal valve closure is sought, that will minimize the maximum pressure and/or stresses. A continuous optimal valve closure policy is specified using spline functions. Numerical examples are presented showing the reduction of the dynamic stress and the dynamic pressure from linear valve closure to optimal valve closure.