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Drilling predation traces on recent limpets from northern Patagonia, Argentina
(Coquina Press, 2018-09)
In this study we analyze the predator-prey relationship between muricid gastropods (mainly Trophon geversianus) and the limpets Nacella magellanica, Fissurella radiosa, Diodora patagonica and Siphonaria lessoni from recent ...
A non-linear Cosserat rod model for drill-string dynamics in arbitrary borehole geometries with contact and friction
(Pergamon-Elsevier Science Ltd, 2019-07)
A model for drill-string dynamics in arbitrary borehole geometries based on the Cosserat rods theory is presented. The objective of this work is to exploit the capabilities of the Cosserat rods to capture the full range ...
ROBOCLIMBER: Control System Architecture
(07/01/2004)
The paper shows the complete system architecture of a walking and climbing robot developed to make slope consolidation, where heavy duty equipment is employed for drilling up to 20m holes. ROBOCLIMBER a quadruped robot ...
Mantenimiento mecánico de taladros
(Servicio Nacional de Aprendizaje (SENA)Dirección Nacional. División industrial, 2019)
Oil well drill bit failure during pull out: Redesign to reduce its consequences
(Pergamon-Elsevier Science Ltd, 2018-01)
A drill bit with polycrystalline diamond (PDC) inserts lost one of its three blades when operating in an oil well, leading to a costly failure. Operating conditions and associated stresses were analyzed, bit core material ...
Naticid drilling predation from tidal flats in northern Patagonia, SW Atlantic
(Cambridge University Press, 2020-09-28)
Naticids and muricids are the main drilling gastropod families that leave a characteristic hole in their shelled prey. Drilling predation can be evaluated along spatial scales, and different latitudinal patterns (equatorward, ...
Taladrado
(Servicio Nacional de Aprendizaje (SENA)Subdirección Técnico Pedagógica. División de Diseño de Programas de Formación Profesional, 2019)
Drilling predation on Antarctic tusk shells: First records on Recent scaphopods from the Southern Hemisphere
(Cambridge University Press, 2021-05-24)
Drillholes on shells are one of the few predation marks preserved in fossil molluscs, providing an opportunity to study and quantify predator-prey interactions in the palaeontological record. Among these, reports of drilling ...
Effect of the mechanical properties on drilling resistance of Al2O3-TiO2 coatings manufactured by atmospheric plasma spraying
(ELSEVIER SCIENCE SA, 2013-04-15)
Al2O3 with 13 and 45wt.% TiO2 microsized powders (6-22 and 13-41µm for each chemical composition) were used as raw materials to coat AISI 1040 steel by atmospheric plasma spraying. The mechanical properties of the coatings ...
Coupled axial/torsional vibrations of drill-strings by means of non-linear model
(Pergamon-Elsevier Science Ltd, 2007-07)
In the present work a geometrically non-linear model is presented to study the coupling of axial and torsional vibrations on a drill-string, which is described as a vertical slender beam under axial rotation. It is known ...