Results 41 to 50 of about 164 (152)

Percussive-rotary Drilling Tool with Spring Accumulating Collision

Shiyou jixie, 2015
Percussive-rotary drilling technology is one of the effective ways to improve the drilling speed of deep and super-deep wells.Percussive-rotary drilling tool with spring accumulating collision is developed by combining a short positive displacement motor
Xuan Lingchao, Guan Zhichuan, Zhang Huizeng, Liu Yongwang   +3 more
doaj  

Sourcing carnelian beads from the ancient Mesopotamian site of Kish, Iraq, 2450–2200 BCE: Stylistic, technological and geochemical approaches

Archaeometry, Volume 68, Issue S1, Page S22-S37, April 2026.
Abstract Trade between Mesopotamia and the Indus Civilization is studied through the analysis of Early Dynastic III Period (2600–2350 BCE) carnelian beads from the site of Kish, Iraq. Morphological and technological features of the beads are compared with beads from the Indus region.
J. Mark Kenoyer, Randall W. Law, Laure Dussubieux   +2 more
wiley   +1 more source

Drilling Within the Critical Zone

Hydrological Processes, Volume 40, Issue 3, March 2026.
This review synthesises 30 years of critical zone drilling methodologies for studying subsurface weathering, water storage, and biogeochemical processes. We evaluate drilling techniques, sampling strategies, downhole logging, and long‐term monitoring approaches while addressing contamination control and core preservation challenges.
Amanda Donaldson, Russell P. Callahan, W. Jesse Hahm, David N. Dralle, Anders Noren, Rachel E. Breunig, Berit M. Hudson Rasmussen, Laura V. Krone, Susan L. Brantley, A. Joshua West, Lin Ma, Clifford S. Riebe, Margaret Zimmer, Ashlee Dere, Daniella Rempe   +14 more
wiley   +1 more source

Evaluation of the Efficiency of Impact Mechanisms on the Example of Hydraulic Rotary Hammer Drills

Management Systems in Production Engineering
The efficiency of energy transfer in impact mechanisms, often referred to as impact engines, is of key importance for users of these devices, including hydraulic rotary hammer drills.
Krauze Krzysztof
doaj   +1 more source

Testing of SLUSH ice penetrating probe in Europa, Enceladus, and Mars environments

Frontiers in Space Technologies
Europa and Enceladus conceal global liquid-water oceans beneath ice shells several kilometers thick, and Mars holds thick polar ice deposits that may cover localized layers of liquid water or brine.
Leo Stolov, Caleb Lang, Kris Zacny, Boleslaw Mellerowicz, Joseph Palmowski, Kathryn Bywaters, Frank Sheeran, Paul van Susante, Bethany L. Ehlmann   +8 more
doaj   +1 more source

Quantifying Gas and Thermal Energy Emissions in an Active Geothermal Area: Insights From Le Biancane (Larderello Field, Italy)

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 3, March 2026.
Abstract The Larderello‐Travale area in the northern Apennines of Italy hosts the world's oldest exploited geothermal field. Its success lies primarily in the presence of an extraordinary geothermal resource housed in a large vapor‐dominated fractured reservoir that produces superheated steam.
D. Granieri, M. Cerminara, F. Mazzarini, R. Novellino, M. Trolese, E. Dallara, M. Lelli   +6 more
wiley   +1 more source

Parameter characteristics and rock-breaking mechanisms of horizontal drilling of underground collapsed bodies in coal mines

Meitian dizhi yu kantan
ObjectiveWith continuously increasing coal mining depth, the risks of hazards such as roof collapse and personnel entrapment caused by high in situ stress and mining-induced pressure have significantly intensified.
Ningping YAO, Xuqian DOU, Zhaoyang HAN, Guohua ZHANG, Yuchen SUN, Hao LI, Li WANG   +6 more
doaj   +1 more source

Simulation and Analysis of a Split Drill Bit for Pneumatic DTH Hammer Percussive Rotary Drilling

Geofluids
Reverse circulation impact drilling has the advantages of high drilling efficiency and less dust, which can effectively form holes in hard rock and gravel layer.
Yuanling Shi, Conghui Li
doaj   +1 more source

Propagation Characteristics of Bottomhole Cracks Created by the Percussive-Rotary Stepping Drilling ROP Improving Method

Shiyou jixie
In order to solve the problems of poor rock drillability,low rock-breaking efficiency and short service life caused by high hardness,high strength and stress concentration of bottomhole rock in deep formations,a new concept of ROP improvement by ...
Liu Yongwang, Liu Jiaxiong, Guan Zhichuan, Wang Huajian, Zhao Guoshan, Zhang Shuhui   +5 more
doaj  

Unoccupied Aircraft Systems Sampling for Earth and Mars

The Planetary Science Journal
Unoccupied aircraft systems (UAS) technology on Earth has become increasingly prevalent and accessible, and for extraterrestrial applications, the Ingenuity helicopter has proven the viability of flight on Mars.
Colin Chen, Christopher W. Hamilton, Christian Sipe, Kathryn Bywaters, Justin Lawrence, Paul Creekmore, Nicklaus Traeden, Kris Zacny   +7 more
doaj   +1 more source