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Environmental problems caused by Istanbul subway excavation and suggestions for remediation Ibrahim Ocak Abstract: Many environmental problems caused by subway excavations have inevitably become an important point in city life. These problems can be categorized as transporting and stocking of excavated material, traf?c jams, noise, vibrations, piles of dust mud and lack of supplies. Althou
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Substation system over-voltage protection technology Second substation equipment over-voltage protection on electronic information system for the protection of core equipment for the construction of a protected both pressure and other potential system, and through all levels of over-voltage surge protectors of the current step by step into the land of China, Substation secondary safety equipm