Fundamental rock-drilling studies are aimed at optimizing the drilling efficiency by identifying the optimal drilling conditions and rock drillability. In this study, a field-drilling test is performed using a rotary non-percu. [pdf]
Dongguan is dubbed as a "National Basketball City" and is the only prefecture-level city with three professional basketball clubs in China. Established in 1993, the are the first professional basketball club in China, and won eleven (CBA) championships. The city hosted events during the at the [pdf]
This article lists the main components of a onshore . rigs have similar elements, but are configured with a number of different drilling systems to suit drilling in the marine environment. The equipment associated with a rig is to some extent dependent on the type of rig but typically includes at least some of the items listed below. [pdf]
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