Results 11 to 20 of about 14,667,599 (290)
Real-Time Minimization of Mechanical Specific Energy with Multivariable Extremum Seeking [PDF]
Energies, 2021 Drilling more efficiently and with less non-productive time (NPT) is one of the key enablers to reduce field development costs. In this work, we investigate the application of a data-driven optimization method called extremum seeking (ES) to achieve more
Magnus Nystad +2 more
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A New Mechanical Specific Energy Model for Composite Impact Drilling
Applied Sciences, 2022 Composite impact drilling technology is one of the important techniques to increase drilling speeds in deep hard formations. In order to evaluate the efficiency of drilling with a composite impactor in real time and effectively, and to further improve ...
Jianyu Qin +6 more
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A Survey of Application of Mechanical Specific Energy in Petroleum and Space Drilling
Energies, 2022 The optimization of drilling operations is an ongoing necessity since the major proportion of the terrestrial hydrocarbon reservoirs has been exhausted. Furthermore, there is a growing tendency among the space exploration agencies to drill the subsurface
Mitra Khalilidermani, Dariusz Knez
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Energies, 2022 This article is devoted to the development of technology for improving the efficiency of directional well drilling by predicting and adjusting the system of static and dynamic components of the actual weight on the bit, based on the real-time data ...
Andrey Kunshin +3 more
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Mechanical muscle properties and intermuscular coordination in maximal and submaximal cycling: theoretical and practical implications [PDF]
, 2014 This thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel UniversityThe ability of an individual to perform a functional movement is determined by a range of mechanical properties including the force and power producing ...
Barratt, Paul
core +7 more sources
Experimental study on working mechanics of PDC bit with worn teeth
Jin'gangshi yu moliao moju gongcheng, 2023 PDC bits have been working in a worn state for a long time. To explore its cutting performance and avoid premature failure of the bit, this paper analyzes the load on the worn teeth and the drilling characteristics of the bit through single tooth cutting
Chunliang ZHANG +6 more
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Binding energy and specificity in the catalytic mechanism of yeast aldose reductases [PDF]
Biochemical Journal, 1999 Derivatives of D-xylose and D-glucose, in which the hydroxy groups at C-5, and C-5 and C-6 were replaced by fluorine, hydrogen and azide, were synthesized and used as substrates of the NAD(P)H-dependent aldehyde reduction catalysed by aldose reductases isolated from the yeasts Candida tenuis, C. intermedia and Cryptococcus flavus.
B, Nidetzky +3 more
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Specific microbiome-dependent mechanisms underlie the energy harvest efficiency of ruminants [PDF]
The ISME Journal, 2016 Abstract Ruminants have the remarkable ability to convert human-indigestible plant biomass into human-digestible food products, due to a complex microbiome residing in the rumen compartment of their upper digestive tract. Here we report the discovery that rumen microbiome components are tightly linked to cows’ ability to extract energy ...
Shabat, Sheerli Kruger Ben +8 more
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Demand-Controlled Ventilation Energy Savings for Air Handling Unit
, 2021 Heat, cooling, and ventilation units are major energy consumers for commercial buildings, consuming as much as 50% of a building’s total annual power usage.
Razban, Ali +2 more
core +1 more source
Energies, 2022 The Permian igneous rock in Shunbei Oilfield exhibits high rock strength, which results in a low rate of penetration (ROP) and shortens the cutter’s service life. It is necessary to analyze and evaluate the rock breaking effect of cutters.
Zhuoxin Dong +6 more
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