Results 61 to 70 of about 519,021 (315)

An experimental study of the effect of temperature on teeth breaking efficiency based on rock mechanical properties

Natural Gas Industry B
To master changes in rock mechanical properties and the impact of high temperature on rock-breaking efficiency, the rock mechanical properties of granite, limestone, and sandstone under different temperatures and single-tooth static-pressure experiments ...
Dongdong Song, Mingmin He, Jian Wang, Heyi Yuan, Ke Liu, Zijie Li, Heng Yin, Jun Yan, Yingxin Yang, Zhen Liu   +9 more
doaj   +1 more source

Metal drilling with portable hand drills [PDF]

, 1970
Study of metal drilling solves problems of excessive burring, oversized holes, and out-of-round holes. Recommendations deal with using the proper chemical coolants, applying the coolants effectively, employing cutting oils, and dissipating the heat ...
Edmiston, W. B., Harrison, H. W., Morris, H. E.   +2 more
core   +1 more source

Thermophysical Properties of the Desulphurization Slags With Various CaS and CaO/Al2O3 Ratio

Advanced Engineering Materials, EarlyView.
This article investigates how CaS content and the CaO/Al2O3 ratio influence the thermophysical properties of desulphurization slags. Using experimental measurements and thermodynamic simulations, this study reveals complex effects on viscosity, surface tension, and density, providing new insight into slag structure and phase behavior under ...
Eldar Salpagarov, Matheus Roberto Bellé, Anton Yehorov, Julia Richter, Olena Volkova   +4 more
wiley   +1 more source

Al–Cu Composite Casting of Laser‐Deoxidized Copper: Bonding, Interfacial Chemistry, and Thermal Conductivity

Advanced Engineering Materials, EarlyView.
This study investigates laser‐based oxide removal of Cu inserts in oxygen‐free conditions and examines long‐term oxidation kinetics and surface chemistry under different atmospheres via X‐ray photoelectron spectroscopy. Al–Cu compound casting with differently oxidized surfaces is performed, and intermetallic phase formation, morphology, and thermal ...
Timon Steinhoff, Finn‐Lennard Janthur, Sascha Zimmermann, Sarah Seffer, Jörg Hermsdorf, René Gustus, Ludger Overmeyer, Wolfgang Maus‐Friedrichs, Hans Jürgen Maier, Christian Klose   +9 more
wiley   +1 more source

Assessing Altered Coating Adhesion on Plasma‐Deoxidized Surfaces Under Oxygen‐Free Conditions

Advanced Engineering Materials, EarlyView.
This study demonstrates the effectiveness of atmospheric pressure plasma pretreatment in modifying silicon and stainless steel surfaces to improve adhesion. Argon‐hydrogen plasma increases surface roughness and improves adhesion strength, whereas pure argon results in smoother surfaces and structural changes.
Selina Raumel, Lara Kuhr, Khemais Barienti, Sebastian Herbst, Florian Nürnberger, Hans Jürgen Maier, Marc C. Wurz   +6 more
wiley   +1 more source

From environmental stress to spatial expulsion - rethinking concepts of socio-spatial exclusion in later life

International Journal of Ageing and Later Life, 2018
Gerontology has a longstanding tradition of researching the relationship between older adults and their socio-spatial environments. However, environmental gerontology often shares a positivistic understanding of space as either a “prosthetic” or a ...
Anna Wanka, Thibauld Moulaert, Matthias Drilling   +2 more
doaj   +1 more source

Initial Reports of the Deep Sea Drilling Project, vol. 85 [PDF]

, 1985
Covering Leg 85 of the cruises of the Drilling Vessel Glomar Challenger Los Angeles, California, to Honolulu, Hawaii March-April 1982. Includes six chapters: 1.
Barron, John A., Dunn, Dean A., Handyside, Tim, Hills, Scott, Jarvis, Ian, Mayer, Larry A., Nagrini, Catherine A., Pisias, Nicklas G., Pujos, Annick, Saito, Tsunemasa, Stout, Paul, Theyer, Fritz, Thomas, Ellen, Weinreich, Norbert, Wilkens, Roy H.   +14 more
core   +1 more source

Space weather effects on drilling accuracy in the North Sea [PDF]

, 2005
The oil industry uses geomagnetic field information to aid directional drilling operations when drilling for oil and gas offshore. These operations involve continuous monitoring of the azimuth and inclination of the well path to ensure the target is ...
Allen, W., Baillie, O., Bowe, J., Clarke, E., Lesur, V., Macmillan, S., Reay, S.J.   +6 more
core   +5 more sources

Investigation of Oxygen‐Free Wetting Behavior of Aluminum on Copper via Molecular Dynamics Simulations and Experiments

Advanced Engineering Materials, EarlyView.
The wettability of aluminum droplets (Al) on different copper substrates (Cu), where liquid Al spreads on solid Cu surfaces to form a liquid–solid interface, is studied numerically and experimentally. The experimental and numerical results show good agreement in the fast‐spreading regime.
Shan Lyu, Timon Steinhoff, Finn‐Lennard Janthur, Sarah Seffer, Jörg Hermsdorf, Christian Klose, Ludger Overmeyer, Hans‐Jürgen Maier, Nina Merkert   +8 more
wiley   +1 more source

Study on the migration mechanism of heterogeneous cuttings in long-reach horizontal wells

Scientific Reports
This study focuses on the transportation of non-uniform cuttings in the drilling process of long-reach horizontal wells, conducting a comprehensive theoretical analysis and experimental investigation.
Chunhua Wang, Shibin Li, Yue Qi, Zhenhua Zhang, Dianfu Zheng, Hui Zhong, Changhao Wang   +6 more
doaj   +1 more source