Results 11 to 20 of about 213 (157)
Shock and Vibration, 2017 Based on an optimized lunar regolith coring bit (LRCB) configuration, the load characteristics of rotary-percussive drilling of lunar rock simulant in a laboratory environment are analyzed to determine the effects of the drilling parameters (the ...
Peng Li +3 more
doaj +1 more source
Shiyou jixieThe compatibility of percussion tools， PDC cutter types and hard rock formations is a key factor in extending the service life of percussion tools and drill bits and achieve the best rock breaking effect， but it has been rarely studied.
Leng Youheng +4 more
doaj +3 more sources
Structural Design and Test of Mechanical Rotary Percussion Drilling Tool
Shiyou jixie, 2020 Rotary percussion drilling technology can greatly increase the ROP of hard formations, but for plastic rocks, rock fragmentation is poor. For this reason, this paper proposes a technical plan for mechanical rotary percussion drilling tool prototype ...
Zhang Haiping
doaj
(Un)threading Rhythms: On Affect and Vibe in a Rave
Anthropology of Consciousness, EarlyView.ABSTRACT In Toronto, raves arise across large nightclubs, DIY venues and outdoors, despite changing regulations that have further arranged and narrowed their possibility in the past 4 years. Following a rave in Toronto, this work explores ways that potentialities and affects emerge in a single night, through my entry of taking part in dancing and ...
Tatiana Yunadi
wiley +1 more source
Shiyou jixie, 2020 High-speed rotary percussive drilling technology is a new type of high-efficiency rock breaking technology based on PDM drilling and self-oscillating rotary percussive drilling.
Yu Yang, Liu Shiyin
doaj
Boreas, EarlyView.Understanding the temperature variability of past interglacial cycles is essential to predict future climates. We present a new summer temperature reconstruction, based on the subfossil chironomid record from a small palaeolake adjacent to the Middle Palaeolithic site of Lichtenberg, northern Germany. The record spans from the Saalian late glacial over
Sonja Rigterink +10 more
wiley +1 more source
Flow structure and rock-breaking feature of the self-rotating nozzle for radial jet drilling
Petroleum Science, 2019 For improving the hole-enlarging capability, roundness and rock-breaking efficiency of the nozzle in radial jet drilling, a new structure of self-rotating nozzle was put forward.
Hua-Lin Liao +5 more
doaj +1 more source
Boreas, EarlyView.The Palaeolithic site of Ochtmissen (Lower Saxony, Germany) was excavated in fluvial terrace deposits during the winter of 1993/1994. The current study presents, for the first time, a thorough analysis of the lithic assemblage, encompassing its primary technological and typological characteristics, as well as the type and age of the fluvial deposits ...
Gianpiero Di Maida +4 more
wiley +1 more source
New drilling methods for the conductor casing operations [PDF]
Acta Montanistica Slovaca, 2006 The necessity to apply casing to wells drilled in loose rock strata have recently created conditions for the modernization of old solutions and the development of new drilling technologies. The newest World's design and technological solutions for rotary,
Rafał Wiśniowski
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Land Degradation &Development, Volume 37, Issue 13, Page 9114-9125, 15 August 2026.ABSTRACT Salt affected soils are common worldwide, resulting from natural causes and anthropogenic activities. Saline and sodic soils often occur in association with oil and gas production, impacting soil properties which can impede vegetation growth and development.
Laura Bony +3 more
wiley +1 more source