Results 121 to 130 of about 643,401 (321)
Computer simulation of a drilling bit feed rate regulator comprising of a dc motor
Известия высших учебных заведений: Проблемы энергетики, 2017 This paper considers the possibility of applying a drawworks DC motor and a magnetic powder brake as an active bit feed rate regulator. A dynamic mathemat-ical model of the DC motor is presented.
O. V. Nikulin, V. A. Shabanov
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Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout. [PDF]
Sensors (Basel), 2021 Li H, Wang R.
europepmc +1 more source
Below the leaves: Integrating above‐ and below‐ground phenology for earth‐system predictability
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Almost every aspect of biological systems has phenology—a pattern in activity or function linked to annual cycles. Most terrestrial phenology research focusses on leaves, the onset of leaf out or senescence.
Kendalynn Morris, Richard Nair
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Journal of the Royal Anthropological Institute, EarlyView.Our understanding of the recolonization of northwest Europe in the period leading up to the Lateglacial Interstadial relies heavily on discoveries from Gough's Cave (Somerset, UK). Gough's Cave is the richest Late Upper Palaeolithic site in the British Isles, yielding an exceptional array of human remains, stone and organic artefacts, and butchered ...
Silvia M. Bello +2 more
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Dynamic characteristics and safety analysis of drill strings in deepwater open hole drilling
Energy Exploration & ExploitationOpen hole drilling is expected to become the mainstream technology for ultra-deepwater applications. During ultra-deepwater drilling, the drill string is influenced by oceanic wind, waves, and currents, resulting in highly complex mechanical behavior ...
Fangfei Huang +4 more
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And then there was us Et puis nous sommes apparus
Journal of the Royal Anthropological Institute, EarlyView.In 1987, the academic conference ‘Origins and Dispersals of Modern Humans: Behavioural and Biological Perspectives’ was held in Cambridge, UK. Subsequently referred to as the ‘Human Revolution’ conference, this meeting brought together the most prominent academics working in the field of human origins, including archaeologists and palaeoanthropologists,
Emma E. Bird +2 more
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Shiyou jixieIn response to the demand for plugging old wells of CO2 gas storage under the carbon peak and carbon neutrality goals， to address the challenges of deploying wireline logging tools to the bottomhole of highly-deviated and complex-structure wells during ...
Ren Xianke +6 more
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History, EarlyView.Abstract In the summer of 1919, W. T. Goode, the Manchester Guardian’s special correspondent in Russia and the Baltic, was arrested in the Estonian capital Tallinn and briefly detained aboard a British warship. Goode's detention caused a furore, leading to accusations of kidnap, heated commentary in the press and questions in parliament.
Colin Storer
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Research on Vibration Reduction and ROP Acceleration for Drilling in KOA Oilfield,Kazakhstan
Shiyou jixie, 2023 The KOA oilfield is located in the eastern margin of the Caspian Basin,Kazakhstan.The shallower Upper Permian of the oilfield is found with severe interbeding between sandstone and mudstone as well as interlayers of mudstone/slate and conglomerate.The ...
Wang Jianning +4 more
doaj
Bound by blood and bloodshed: Sibling ties and participation in genocidal violence
Criminology, EarlyView.Abstract Focusing on the 1994 genocide in Rwanda, we examine how sibling relationships—one of the most salient familial bonds—influence individual engagement in violence during mass atrocity. Drawing on an adaptation of differential association and social learning theories for contexts of mass atrocity, we analyze a novel dataset linking over 300,000 ...
Jack G. R. Wippell +3 more
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