Results 111 to 120 of about 3,841 (276)
A preliminary evaluation of a hydraulic mechanical splitter as a means of breaking rock in a deep-level mine [PDF]
, 2018 Dissertation (MEng)--University of Pretoria, 2018.Conventional drill-and-blast practice in deep-level hard rock mining impacts negatively on the immediate environment and alternatives are frequently sought for efficient, continuous, automated and safe ...
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Development of Hydraulic Rotary Impact Tool
Shiyou jixie, 2017 To improve the penetration rate of PDC bit in hard formation of deep well, a hydraulic rotary impact tool has been developed. The tool can generate high frequency impact in the circumferential direction and the hydraulic pulse in the axial direction ...
Zheng Ruiqiang
doaj
Energy Science & EngineeringABSTRACT In response to the dynamic hazards caused by the fracture of thick‐hard strata in deep mining, this study investigates their progressive breaking law by integrating theoretical analysis based on thick plate theory with physical simulation experiments.
Meilu Yu, Jianping Zuo
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Sensitivity Analysis of Main Formation Parameters in Electric Pulse Rock-Breaking
Shiyou jixieThe hardness and wear resistance of rocks severely limit the efficient exploitation of deep and ultra-deep oil and gas resources, while electric pulse rock-breaking technology has unique advantages in breaking hard rocks.To investigate the influence of ...
Cheng Jin +4 more
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Rock breaking performance of disc cutter assisted by circumferential pre-slotting
Meitan xuebaoDisc cutter has a better hard rock breaking performance due to its undercutting mode. To further improve the mechanized excavation efficiency of hard rock roadway in underground coal mine, the rock wedged performance of disc cutter assisted by ...
Hongxiang JIANG +5 more
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Asia-Pacific Journal of Chemical Engineering, EarlyView.ABSTRACT Healthcare derived polystyrene waste represents a growing and under addressed fraction of plastic waste streams due to contamination risks and limited recyclability. This study aims to investigate the valorization of waste polystyrene foam through catalytic and noncatalytic pyrolysis pathways to evaluate product yield distribution and identify
Salman Khan +4 more
wiley +1 more source
Journal of Applied Polymer Science, EarlyView.Post‐consumer metallized flexible packaging waste and industrial EPM waste are transformed into sustainable composites through mechanical recycling. The incorporation of 30 wt% EPM provides the most favorable balance between stiffness, ductility, and impact resistance, achieving 53.36 kJ/m2.
Tiago O. Oliveira +2 more
wiley +1 more source
Between a rock and a hard place: Public theology in a post-secular age [PDF]
, 2013 This is the author's PDF version of a book published by SCM Press© 2013.Public theology is an increasingly important area of theological discourse with strong global networks of institutions and academics involved in it.
Graham, Elaine
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The Anatomical Record, EarlyView.Abstract The Pleistocene is a key period for understanding the evolutionary history and palaeobiogeography of the European rabbit (Oryctolagus cuniculus). The species was first documented in southeastern Iberia at the beginning of the Middle Pleistocene and appears to have rapidly spread throughout Southwestern Europe, where it was found in numerous ...
Maxime Pelletier
wiley +1 more source
Effect of confining pressure on rock breaking by high-pressure waterjet-assisted TBM [PDF]
High-pressure waterjet-assisted tunnel boring machine (WTBM) is an efficient method for improving the tunneling performance of a tunnel boring machine (TBM) and reducing the wear of its disc cutters in hard rock with high geostresses.
Enzhi Wang +6 more
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