Results 131 to 140 of about 333 (189)
Quantifying coral reef accretion in a changing world: approaches, challenges and emerging opportunities. [PDF]
Camb Prism Coast Futurde Bakker DM, Perry CT, Webb AE.
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Assessment of Bacterial Load and Post-Endodontic Pain after One-Visit Root Canal Treatment Using Two Types of Endodontic Access Openings: A Randomized Controlled Clinical Trial. [PDF]
Dent J (Basel)Al-Ani AM, Ali AH, Koller G.
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Late Paleolithic whale bone tools reveal human and whale ecology in the Bay of Biscay. [PDF]
Nat CommunMcGrath K +20 more
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Characterization of rotary-percussion drilling as a seismic-while-drilling source
Journal of Applied Geophysics, 2018Abstract This paper focuses on an evaluation of rotary-percussion drilling (RPD) as a seismic source . Two field experiments were conducted to characterize seismic sources from different rocks with different strengths, i.e. weak shale and hard arkose. Characterization of RPD sources consist of spectral analysis and mean power measurements, along
Yingjian Xiao, Stephen D Butt
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Embedded Drilling System Using Rotary-Percussion Drilling [PDF]
, 2018 The drilling technology is widely used in various fields. This technology has been developed explosively by large companies. However, most of the conventional drilling systems require large equipment such as rig and mud systems. This makes it difficult for drilling in polar or space environments where large equipment is hard to enter or carry. To solve
Jongheon Kim, Jinkwang Kim, Hyun Myung
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Rotary Percussion and Auger Drilling [PDF]
, 2010 In rotary percussion drilling, a variety of blade or roller bits (Fig. 5.2) mounted on the end of a rotating string of rods cut and break the rock. A percussion or hammer action in conjunction with a chisel bit can be used to penetrate hard material.
Roger Marjoribanks
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Modeling Percussion and Rotary Percussion Drilling in Strong Rocks
Journal of Mining Scienceexaly +2 more sources
Optimization of percussive mechanism in rotary-percussion drill for lunar exploration
2013 IEEE International Conference on Robotics and Biomimetics (ROBIO), 2013Rotary-percussive Drill (RPD) has been widely employed in extraterrestrial exploration as a main drilling and sampling device. Percussive mechanism, as an inevitable part of RPD, is commonly utilized to exert percussion onto drill stem to improve drilling performance once hard rock is encountered.
Degang Jie +6 more
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