Results 101 to 110 of about 213 (157)

A 10-Year Follow-Up of an Approach to Restore a Case of Extreme Erosive Tooth Wear. [PDF]

Dent J (Basel)
Foschi D, Abate A, Vailati F, Loi I, Maspero C, Lanteri V.   +5 more
europepmc   +1 more source

Quantifying coral reef accretion in a changing world: approaches, challenges and emerging opportunities. [PDF]

Camb Prism Coast Futur
de Bakker DM, Perry CT, Webb AE.
europepmc   +1 more source

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.
europepmc   +1 more source

Late Paleolithic whale bone tools reveal human and whale ecology in the Bay of Biscay. [PDF]

Nat Commun
McGrath K, van der Sluis LG, Lefebvre A, Charpentier A, Rodrigues ASL, Álvarez-Fernández E, Baleux F, Berganza E, Chauvière FX, Dachary M, Duarte Matías E, Houmard C, Marín-Arroyo AB, de la Rasilla Vives M, Tapia J, Thil F, Tombret O, Torres-Iglesias L, Speller C, Zazzo A, Pétillon JM.   +20 more
europepmc   +1 more source

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Parameter Optimization and Application Evaluation of Rotary Percussion Drilling

International Petroleum Technology Conference, 2021
Abstract Rotary percussion drilling has gained increasing interest in the oil and gas industries because of its high drilling efficiency and good deviation control [1, 2]. In this work, a rotary percussion-based drilling tool is successfully deployed in a test well, and demonstrates a convincing enhancement of the rate of penetration ...
Li Bodong
exaly   +2 more sources

Characterization of rotary-percussion drilling as a seismic-while-drilling source

Journal of Applied Geophysics, 2018
Abstract 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
exaly   +2 more sources

rotary-percussion drilling equipment

2014
exaly   +2 more sources

Development of a rotary-percussive drilling mechanism (RPDM)

2012 IEEE International Conference on Robotics and Biomimetics (ROBIO), 2012
A project named Chang'e is currently aiming to accomplish acquiring the lunar soil through automated robotic device. Therefore, many engineers are attempting to develop a kind of prototype of lunar soil coring for the mission. This paper presents a Rotary-percussive Drilling Mechanism (RPDM) which is a novel scheme for driving unit in the deep lunar ...
Qiquan Quan, Peng Li, Shengyuan Jiang, Xuyan Hou, Dewei Tang, Zongquan Deng, Weiwei Zhang 0009   +6 more
openaire   +1 more source

A Rotary-Percussive Ultrasonic Drill for planetary rock sampling

2016 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), 2016
Conventional ultrasonic drills can drill into rocks using high frequency axial vibration, which feature lower power and lower preload force, thus they could become a very attractive solution for future deep-space exploration. However, drill cuttings cannot be removed effectively with the increase of drilling depth by conventional ultrasonic drills that
Yinchao Wang, He Li 0005, Deen Bai, Qiquan Quan, Hongying Yu, Dewei Tang, Zongquan Deng   +6 more
openaire   +1 more source

Modeling Percussion and Rotary Percussion Drilling in Strong Rocks

Journal of Mining Science
exaly   +2 more sources