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Water inflow into deep excavations is a key parameter in the evaluation of environmental impact, and a simplified method is needed to calculate the inflow with adequate accuracy, especially for a deep excavation with a cutoff wall around it. This paper presents a model for calculating inflow based on the method of fragments, assuming two-dimensional sectional flow. The effects of cutoff wall thickness...
Carbon nanotubes (CNTs) have been successfully produced from 10 typical Chinese caking-coals using an arc plasma technique. For comparison, one caking coal from New Zealand is also tested. The results show that all coals tested can be used to produce significant quantities of CNTs with fullerenes as by-products. The CNTs are examined using scanning electron microscope and high resolution transmission...
We report a feasibility study of producing fullerenes (C 60 and C 70 ) using carbon rods manufactured from Chinese coal which is one of the cheapest natural resources of carbon. A DC arc method is employed using coal-derived carbon rods as electrode materials. The carbon rods are prepared from seven typical Chinese hard coals including bituminous coals and anthracite. The...
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