Results 51 to 60 of about 287,346 (143)
Meteoritics &Planetary Science, Volume 61, Issue 7, Page 1288-1308, July 2026.Abstract A core drilled through shocked and faulted Archean granitoid gneisses and dolerites in the eroded peak ring of the 70–80 km diameter Morokweng impact structure intersects multiple centimeter‐ to meter‐wide clastic‐matrix breccias containing a polymict clast population of lithic and mineral clasts and altered, millimeter‐ to centimeter ‐size ...
Roger L. Gibson +3 more
wiley +1 more source
University Percussion Ensemble, March 21, 1979
, 2018 Recorded during a live performance at Oakland Recital Hall, Western Michigan University, Kalamazoo, Michigan, March 21, 1979, program no. 204 of the Department of Music's 1978-1979 season.University Percussion Ensemble, Michael Varner, director ; Roxann ...
Western Michigan University. Percussion Ensemble
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Near Surface Geophysics, Volume 24, Issue 3, Page 234-251, June 2026.Abstract A better understanding of the near‐surface aquifer system of the Caxambu Water Park, located in the Minas Gerais State, Brazil, has been achieved. The study aimed to identify groundwater reservoirs and flow patterns and contribute to the hydrogeological conceptual model using a multi‐scale geophysical approach.
Emanuele F. La Terra +5 more
wiley +1 more source
Key Technology for Drilling Speed Improvement of High Abrasive Formation in Aktobe
Shiyou jixie, 2018 The Zahnanor and North Tluwa oil field in the Aktobe area are rich in oil and gas resources. The main oil and gas reservoirs are located in the Carboniferous strata below the Permian.
Wang Gang +6 more
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REDUCTION OF COST AND TIME CONSUMPTION IN WELL-CONSTRUCTION
Rudarsko-geološko-naftni Zbornik, 1998 A Contractor usually utilizes the available drilling equipment when constructing just one single well. Drilling cost and time consumption in constructing the well MB-1, using the percussion method, and the well MB-2, using the conventional rotary ...
Mladen Zelenika , Božo Soldo
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Evaluation of the Efficiency of Impact Mechanisms on the Example of Hydraulic Rotary Hammer Drills
Management Systems in Production EngineeringThe 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
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Shiyou jixieAt the time of rotary percussion drilling and grinding of cement plug at high speed,the combination of high-speed rotary cutting and high-frequency axial percussion can significantly improve the efficiency of drilling and grinding cement plug,but the ...
Liu Wang +6 more
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Jixie qiangdu, 2017 A new type composite rotary percussion drilling tool was designed by studying the conversion mechanism of rotary to reciprocating motion. High-frequency axial impact and vibration was generated by an impact and energy transfer mechanism consisting of a ...
ZHANG HaiPing +3 more
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Discover Applied SciencesRotary percussion drills, specifically top hammer types, are essential in resource extraction and exploration. These drills frequently suffer damage at the drill bit, necessitating effective decision-making to address issues.
Yuna Nakazawa +5 more
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Journal of the South African Institution of Civil Engineers, 2011 The article discusses the nature of the gravimetric survey as applied and used in dolomite stability investigations on areas underlain by the Chuniespoort Group in South Africa.
I J Breytenbach, P J A Bosch
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