The present paper deals with the analysis of the behaviour of an earth dam at the end of construction, during the first filling of the reservoir and at long term by using Finite Element Method. In this analysis, El Hma dam, which located in Tunisia, has been selected as a case study. Three constitutive laws including elastic, Mohr-Coulomb and Drucker-Prager, were assumed to present the material characteristics of the dam and its foundation. Attention will be given to the study of predicted deformation, stresses and pore pressure distributions. The interpretations of the predicted results lead to evaluate the dam behaviour.

This paper presents and describes an approach for the optimal design of a fuzzy logic stabilizer to enhance the stability of a superconducting generator (SCG) in a multi-machine system. The input signals to the proposed fuzzy stabilizer are the SCG speed deviation and acceleration. In this approach, unsymmetrical nonlinear membership functions are used, while number of stabilizer parameters to be properly designed is 15, including scaling factors for input and output variables along with widths and centers of fuzzy sets of input variables. Particle swarm optimization (PSO) technique is employed to search for optimal settings of the fuzzy stabilizer parameters. Simulation results show that the proposed, PSO-tuned fuzzy stabilizer provides good damping to SCG in a multi-machine environment when operating in conjunction with conventional stabilizers on other machines.

This paper presents a complete analysis of an induction generator linked to the power network through an ac voltage controller aiming to control the generated active and reactive power at different speeds. The ac voltage controller uses three different control strategies, namely; the firing angle-, the extinction angle- and the symmetrical angle- control strategies to control the generator terminal voltage. The generator electrical and mechanical performance characteristics regarding the harmonic distortion factors, active power, reactive power, power factor, steady torque, pulsating torques and efficiency have been computed at different speeds. These characteristics have been determined with the help of novel equivalent circuits in the frequency domain. These equivalent circuits enable accurate calculation of the generator performance characteristics as the numerical techniques are omitted. Also, unlike the dqo and the abc models, the present model takes into account the generator iron losses effects.

A knowledge of the product distribution from the pyrolysis of coal when particles are heated is of considerable importance in understanding the process involved in both the production of gaseous and liquid fuels from coal and the combustion of coal. Studies of decomposition of Sinai coal and combustion rates have been undertaken because the rate and extent of volatilization play an important part in the ignition process of coal particles in circulating fluidized bed. There is a little information available in the literature on the rate of decomposition occurring under the very rapid heating characteristics of Sinai coal firing. This is due to incomplete knowledge about the phenomenon of combustion of Sinai coal in circulating fluidized involved in special care operations. That is why this work is continued to bring new technical solutions and sake knowledge in this scope more profound.

The proposed software is an advanced computational hydraulic software tool specially adapted for the design, and management of pressurized irrigation networks. The hydraulic solver uses specific strategies and incorporates several new features that improve the algorithms for pipe networks computation. These networks consist of a pumping station, main and secondary flow paths, valves, hydrants, and ancillary equipments. The software simulates hydraulically the flow in the pipe lines by computing the different nodes’ pressure. It executes this throughout converting gis maps digitally into pipe lines, valves, and main pumping station. It is applied on the iip (i.e., irrigation improved project) which is one of the national irrigation development projects in egypt. There is no commercial program produces all these targets because iip has its own specific design criteria such as discharge, water duty, and different sets of pumping units. Total economic aspects including pump station and the network parts together with their constituents are computed too. Construction contracts according to the requirements of the egyptian irrigation ministry's specification are accomplished. It has been tested, calibrated and approved on some developed mesqas comparing manual and implemented results. The efficiency of some algorithms has been estimated using computational geometry rules.