Amr Ibrahem

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A system to emulate railway dc systems is presented in this paper. The emulator is designed to simulate the behavior of railway systems in terms of stray currents and touch voltages. Power electronics circuits are used as variable resistors to simulate the train motion. The emulator provides a test bed to not only study and analyze the effects of stray(More)
The main objective of this study was to assess the short-term effect on health knowledge among pilgrims after being provided specific health education messages. A random sample of 6 entry-point buses was selected. A self-administered questionnaire was used to assess knowledge before and after intervention; 278 pilgrims completed the questionnaire. There was(More)
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