نتایج جستجو برای: and underground railways
تعداد نتایج: 16831727 فیلتر نتایج به سال:
Thyristor rectifiers are widely used in electric railways in order to control the speed. As a consequence of their usage in addition to substantial input lead current, an enormous amount of harmonics is injected into the grid. To avoid such harmonics as well as reactive power compensation, reactive power hybrid filters consisting of active and passive filters are utilized. Regarding different p...
With the fast development and utilization of underground space resource in cities, the spatial distribution of urban underground pipelines becomes more and more complex. How to efficiently utilize the latest technology, realize underground space resources' management, visualization, layout optimization and mine applications, are challenging issues in current digital city development. Taking int...
The rock mass is exposed to stress changes after the excavation made for construction of infrastructures such as roads, railways, hydropower and irrigation projects. expansion roads requires slope cuts which cause natural discontinuities daylight leading failure different types magnitudes. tunnels underground caverns infrastructure projects will pass through with varying cover stability challen...
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