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针对现有钻头心部破岩效率不高的情况,提出一种旋风状井底模型的新型钻头(旋切钻头)。通过研究旋切钻头的运动行为,分析钻头自转坐标系......
The purposes of the paper are threefold: 1) to show the fundamental possibility of physical simulation of non-stationary......
A Possible Causal Mechanism of Geomagnetic Variations as Observed Immediately before and after the 2
During the Mw9 Tohoku-Oki earthquake, gradual increases in both ionosphere total electron content (TEC) and geomagnetic ......