Results 31 to 40 of about 140,547 (299)
IOP Conference Series: Earth and Environmental Science, 2021 Abstract Tearing cutters are generally applied to break rocks when shield tunnelling in the strata with large size boulders. To improve rock breaking efficiency, the processes of tearing cutter impacting rock model are simulated, and the effects of cutter mass, impact velocity and spacings on specific energy of rock breaking are studied.
Jinguo Cheng +4 more
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Substantial bulk photovoltaic effect enhancement via nanolayering. [PDF]
, 2016 Spontaneous polarization and inversion symmetry breaking in ferroelectric materials lead to their use as photovoltaic devices. However, further advancement of their applications are hindered by the paucity of ways of reducing bandgaps and enhancing ...
Grinberg, Ilya +4 more
core +1 more source
Experimental study of the thermal reaming of the borehole by axial plasmatron [PDF]
, 2019 Purpose. To study rock spallation dynamics in the process of the borehole thermal reaming and analyze energy consumption of the borehole thermal reaming process by plasma jets of the axial plasmatron. Methods. Field experimental study of rock spallation
Dhunnoo, N +6 more
core +1 more source
Shiyou jixie, 2021 The research on rock breaking mechanism of special-shaped non-planar PDC cutter is relatively scarce, and the research on domestic prismatic PDC cutter is even scarcer.
Wei Xiuyan +5 more
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New development of efficient rock breaking technology with diamond bit
Jin'gangshi yu moliao moju gongcheng, 2022 Diamond bit is an important tool for drilling. In recent years, with the application of new composite materials and the continuous progress in precision machining technology, combined with the continuous innovation of drilling equipment, diamond bits have achieved rapid development.
Lina SHEN +5 more
openaire +1 more source
Using Concept Maps to Plan an Introductory Structural Geology Course [PDF]
, 2004 This report presents the results of incorporating constructivist methods, including concept maps, into an undergraduate structural geology curriculum. A concept map is a visual representation of concepts and their relationship to each other in a body of ...
core +1 more source
Biosurface and Biotribology, 2021 The purpose of this study is to achieve better understanding of associated mechanisms and to recommend and identify new strategies to develop new rock breaking technology for Tunnel Boring Machines (TBMs).
Jing Zheng +5 more
doaj +1 more source
Study on the Mechanism of High-Efficiency Rock Breaking by Hydraulic Jet Based on Explicit Dynamics
Processes, 2023 High-efficiency rock breaking by hydraulic jetting is the key to radial horizontal drilling technology. In order to improve the drilling efficiency of hydraulic jet rock breaking in radial horizontal wells, based on LS-Dyna display dynamics, a numerical simulation model of single-nozzle jet rock breaking was established to analyze the influence of ...
Gang Bi +6 more
openaire +1 more source
On the puzzling feature of the silence of precursory electromagnetic emissions [PDF]
, 2013 It has been suggested that fracture-induced MHz-kHz electromagnetic (EM) emissions, which emerge from a few days up to a few hours before the main seismic shock occurrence permit a real-time monitoring of the damage process during the last stages of ...
Chelidze, T. +2 more
core +2 more sources
Rock Breaking Efficiency Analysis of PDC Bit Based on Pointing Angle of Controllable Bent Sub
Shiyou jixie, 2021 In order to improve the rock breaking efficiency of the directional downhole closed-loop controllable bent sub, the ABAQUS software was used to conduct dynamic simulation analysis on the continuous sandstone breaking by the PDC bit under the pressurized ...
Zhang Guangwei +3 more
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