Highly Time-Resolved Elemental Source Apportionment at a Prague Urban Traffic Site by Laurence C. Windell, Petra Pokorná, Jaroslav Schwarz, Petr Vodička, Philip K. Hopke, Naděžda Zíková, Radek Lhotka, Jakub Ondráček, Petr Roztočil, Michal Vojtišek, Vladimír Ždímal

“…Aside from SIA, the sources were of local origins. Air mass back trajectories calculated by HYSPLIT and concentration weighted trajectories (CWT) were used to identify long-distance sources. …”
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Experimental Study on the Flow Behavior of Grout Used in Horizontal Directional Drilling Borehole Grouting to Seal Mining-Induced Overburden Fractures by Jinfeng Ju, Jialin Xu, Jing Yang

“…The results showed that, as a result of varying fracture morphologies in different zones of the mining overburden, multiple fracture types were sequentially exposed as the HDD borehole advanced from the original rock mass outside the mining area towards the mining-induced fractured rock mass. …”
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