Results 61 to 70 of about 764,279 (193)
Advanced Energy Materials, EarlyView.Boron‐oxide‐assisted particle engineering stabilizes O3‐type layered cathodes for sodium‐ion batteries by mitigating phase transitions and lattice strain. Acting as flux and structural modifier, boron forms submicron hexagonal platelets with (003) facets and expanded Na‐layer spacing, enabling rapid Na⁺ diffusion and mechanical resilience.
Tengfei Song +9 more
wiley +1 more source
Integrated geo-ecological assessment of drill cuttings and approaches to their disposal
RUDN Journal of Ecology and Life SafetyThe study discusses the chemical properties of rock and drill cuttings. Drill cuttings have a negative impact on the components of the natural environment: soil cover, atmospheric air, groundwater. The purpose of the research was a comprehensive study of
Elena V. Gaevaya
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Известия высших учебных заведений: Геология и разведка, 2016 The paper considers the technological features of rock-destroying instruments (drill bits, drill crowns) of PDC series, concerning their vibration during drilling in rocks, variable in mechanical properties. A factor is presented, which characterizes the
M. S. Frolova
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Comparative Insights and Overlooked Factors of Interphase Chemistry in Alkali Metal‐Ion Batteries
Advanced Energy Materials, EarlyView.This review presents a comparative analysis of Li‐, Na‐, and K‐ion batteries, focusing on the critical role of electrode–electrolyte interphases. It especially highlights overlooked aspects such as SEI/CEI misconceptions, binder effects, and self‐discharge relevance, emphasizing the limitations of current understanding and offering strategies for ...
Changhee Lee +3 more
wiley +1 more source
Essentials of rock drill design [PDF]
, 1940 The earliest history of the rock drill is obscure and only fragmentary evidence concerning it is recorded in the Patent Office. However, no other tool has played a more important part in mining and excavating work.
Cummings, Lister Merriken
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Complex dynamics of drill-strings: Theory and experiments
MATEC Web of Conferences, 2018 We investigate complex drill-string dynamics in a downhole drilling where strong nonlinear interactions between various types of vibration take place.
Wiercigroch Marian +3 more
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Energies, 2018 The lower rate of penetration (ROP) is one of the key technical difficulties during drilling of shale reservoirs. Percussive-rotary drilling (PRD) is crucial for increasing ROP.
Guangjian Dong, Ping Chen
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Rock fragmentation mechanisms induced by a drill bit
, 2004 In most of the mechanical excavation methods the fundamental process is indentation of the rock by a bit. The present paper focuses on discussing how the rock is fragmented under the action of a drill bit.
Liu, Hongyuan, +3 more
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Breaking the Polarity–Coordination Coupling in Electrolyte Design for High‐Voltage Lithium Batteries
Advanced Energy Materials, EarlyView.Steric and electronic co‐regulation of 2,2,2‐trifluoro‐N, N‐dimethylethylamide (DMTFA) decouples high polarity from strong Li+ coordination, creating an anion‐mediated pseudo‐weakly solvating electrolyte. This design lowers Li+ desolvation barriers, enhances Li+ mobility, and builds B‐, F‐, and N‐rich inorganic interphases, enabling stable 3.0–4.6 V ...
Xue Li +9 more
wiley +1 more source
Study on Mechanism of Stick–Slip Vibration Based on Torque Characteristics of PDC Bit
Applied SciencesStick–slip vibration (SV) of drill string systems is the main cause of fatigue failure of PDC bits under complex drilling conditions. Exploring its mechanism is helpful for identifying the causes of bit failure and developing preventive measures to ...
Lijun Li, Chunliang Zhang, Aixuan Wu
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