Drill
Mostrando 13-24 de 145 artigos, teses e dissertações.
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13. Improving short-term grade block models: alternative for correcting soft data
Abstract Short-term mining planning typically relies on samples obtained from channels or less-accurate sampling methods. The results may include larger sampling errors than those derived from diamond drill hole core samples. The aim of this paper is to evaluate the impact of the sampling error on grade estimation and propose a method of correcting the impre
REM, Int. Eng. J.. Publicado em: 2018-03
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14. A Variable-Length Beam Element Incorporating the Effect of Spinning
Abstract This paper proposes a novel variable-length beam element that takes into account the effect of beam spinning. This is the first such beam element of variable length based on the absolute nodal coordinate formulation. In addition to the position and slope vectors, the angles of rotation around the element axis of cross sections that contain two nodes
Lat. Am. j. solids struct.. Publicado em: 2017-08
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15. Use of an Osteoplastic Flap for the Prevention of Mastoidectomy Retroauricular Defects
Abstract Introduction After mastoidectomy, patients usually complain of bone depressions in the retroauricular region in the surgical site, especially in procedures that require extensive cortical resections. This causes inconveniences such as difficulty wearing glasses, cleaning, and aesthetics complaints. Objective This study aims to describe a vascula
Int. Arch. Otorhinolaryngol.. Publicado em: 2017-06
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16. VARIABILIDADE DO DESEMPENHO NO LINE-DRILL TEST EM ADOLESCENTES JOGADORES DE BASQUETEBOL
RESUMO Introdução: A prática de basquetebol durante a adolescência aumenta o tamanho corporal e o desempenho funcional. O basquetebol envolve esforços máximos de curta duração com mudanças de direção que utilizam o metabolismo anaeróbico e a agilidade. Objetivo: Examinar a variação do desempenho no Line-drill Test em adolescentes jogadores de
Rev Bras Med Esporte. Publicado em: 2016-12
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17. Sowing performance by a metering mechanism of continuous flow in different slope conditions
ABSTRACT One of the reasons for the success of a productive culture is the correct sowing. Therefore, the seeds must be properly dosed, deposited and not damaged by the metering mechanism of the seed drill. So, the aim of this study was to evaluate in a simulator the sorghum seed deposition by a metering mechanism with continuous flow in different conditions
Eng. Agríc.. Publicado em: 2016-10
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18. MODELING AND ANALYSIS OF UNSTEADY FLOW BEHAVIOR IN DEEPWATER CONTROLLED MUD-CAP DRILLING
Abstract A new mathematical model was developed in this study to simulate the unsteady flow in controlled mud-cap drilling systems. The model can predict the time-dependent flow inside the drill string and annulus after a circulation break. This model consists of the continuity and momentum equations solved using the explicit Euler method. The model consider
Braz. J. Chem. Eng.. Publicado em: 2016-03
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19. The Influence of Twist Drill Main Cutting Edge Preparation in Drilling Process
In order to improve the performance of a twist drill, one must understand some aspects involved in drilling process that are not commonly addressed, such as the micro geometry employed in the tool’s tip sharpening and the protection of the main cutting edge. The edge of the twist drill can be protected by rounding, chamfering or the combination of both. Th
Mat. Res.. Publicado em: 17/11/2015
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20. Effect of Post Weld Heat Treatment Process on Microstructure and Mechanical Properties of Friction Welded Dissimilar Drill Pipe
In this study, N80-42CrMo4 dissimilar drill pipes were welded by a roto-friction welding machine. A set of welded samples were tested as-welded condition. Another set of welded samples were post weld heat treated (stress relief annealing) at the temperature of 600 °C, for 20 min. and then tested. The microstructures of the as-welded and stress relief anneal
Mat. Res.. Publicado em: 2015-06
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21. The effect of the inner cylinder rotation on the fluid dynamics of non-Newtonian fluids in concentric and eccentric annuli
Helical flow in an annular space occurs during oil drilling operations. The correct prediction of flow of drilling fluid in an annular space between the wellbore wall and the drill pipe is essential to determine the variation in fluid pressure within the wellbore. This paper presents experimental and CFD simulation results of the pressure drop in the flow of
Braz. J. Chem. Eng.. Publicado em: 2014-12
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22. The development and evaluation of individualized templates to assist transoral C2 articular mass or transpedicular screw placement in TARP-IV procedures: adult cadaver specimen study
OBJECTIVES: The transoral atlantoaxial reduction plate system treats irreducible atlantoaxial dislocation from transoral atlantoaxial reduction plate-I to transoral atlantoaxial reduction plate-III. However, this system has demonstrated problems associated with screw loosening, atlantoaxial fixation and concealed or manifest neurovascular injuries. This stu
Clinics. Publicado em: 2014-11
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23. L'INFORMATION BREVET AU SERVICE DE L'INDUSTRIE PÉTROLIÈRE : CAS DE CONCEPTION ET D'OPTIMISATION DES TRÉPANS PAR INGÉNIERIE INVERSEE
The aim of this paper is to show the results of a study originally conducted for an Algerian State-Owned Company ENSP (Manufacturing Branch / formerly ALDIM) specialized in drill bits manufacturing. We show innovation opportunities offered by the use of reverse engineering assisted by patent information in the oil industry. This applied research, mainly base
JISTEM J.Inf.Syst. Technol. Manag.. Publicado em: 2014-09
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24. Foraminotomia cervical posterior: estudo anatômico em cadáveres
OBJETIVO: Utilizar diferentes segmentos da coluna cervical em cadáveres para determinar quanto de massa lateral deve ser ressecada para adequada descompressão foraminal. MÉTODOS: Seis cadáveres foram usados e dissecados de modo a expor a região cervical posterior de C1 até a transição C7-T1. A massa lateral de cada vértebra foi medida bilateralme
Coluna/Columna. Publicado em: 2014-03