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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 413 for “"Drill"”.
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Sensing of drill wear and prediction of drill life
Thesis. 1977. Mech.E.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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Bending vibration of rotating drill strings
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1989.
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Abrasion-corrosion of downhole drill tool components
… project entitled ‘Abrasion-corrosion of downhole drill tool components’. The objective of this project was to replicate the wear-corrosion mechanisms of tungsten carbide (WC)-based hardmetals and coatings occurring in downhole environments (pH 9-11) under controlled laboratory conditions, to …
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Optimization of drill geometry for orthopaedic surgery
… to break during insertion. The majority of holes drilled preparatory to the insertion of screws are made in the shaft of long bones. These shafts of long bones are in effect tubes, there being a hard outer cortex and a central medullary cavity. The point of entry of the drill is called the near or …
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Residual stress evaluation of aluminium drill rods
… developed in extruded high strength aluminium drill rods. These drill rods were manufactured by Hulett Aluminium for the mining industry for surface drilling exploration work. Initially a review of available residual stress measurement techniques was undertaken to establish which technique was …
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Longitudinal and torsional vibration of drill strings
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1986.
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Design and analysis of non-threaded drill pipe connector.
… and Box non-threaded connectors design. Modern drill pipes are connected by rotary threaded shouldered connections that have been prone to failure, leading to fatal accidents on the drilling deck. The proposed connection mechanism aims to improve engagement and disengagement time of pipes by 50% …
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Numerical and field data analysis of drill stem vibration
<p>"Drill stem vibration is a major cause of premature failure of drill stem components and drilling inefficiency. In severe cases, drill stem vibration may lead to wellbore instability that could lead to increased operational cost. Drill stem vibrations are affected by design decisions and the …
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Design and Fatigue Analysis of an LWD Drill Tool
… machines is the Oil and Gas industry. The large drilling tools are used for oil extracts on-shore and off-shore. There are several forces that act on a drilling tool while operating below the earth's surface. Those forces are namely pressure, bending moment and torque. The tool is designed from …
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Identifying the Optimum Zone for Reducing Drill String Vibrations
… address the vibration problems that occur during drilling operations. Due to the rotational motion effected on the drill string while drilling, vibrations occur, and when these vibrations become excessive, the drill string may oscillate in a manner that could damage the pipes and damage other …
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Eddy current detection of fatigue cracks in drill pipes
… Namibia. The method employs a 200m length pipe-drilling structure rotated from the surface and acting as a conduit through which the disturbed sediment is transported to the surface for processing. However, cyclic operating stresses combined with corrosion have tended to cause circumferential …
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The mineralogy of a drill core of Arkansas bauxite
Thesis. (Sc.D.) Massachusetts Institute of Technology. Dept. of Geology, 1947.
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Dynamics of unbalanced drill collars in a slanted hole
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1983.
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Alcohol, task difficulty, and incentives in drill press operation
… of alcohol, task difficulty, and incentives on a drill press simulation were examined. On four nonconsecutive days the subject received four alcohol levels, one level per day. The levels were: 0.00%, 0.03%, 0.06%, and 0.09% blood alcohol concentration (BAC). The drill press simulation task …
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Ros-Drill Automation: Visual Feedback Control And Rotational Motion Tracking
… on a relatively recent procedure called Ros-Drill<sup>©</sup> (rotationally oscillating drill), of which the early versions have already been effectively utilized for the mice. In the first part, we present a procedure to automate a critical part of the operation: <em>initiation of the …
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NMR of geophysical drill cores with a mobile Halbach scanner
… scanner is used for analysis of water-saturated drill cores and plugs with diameters up to 60 mm. To provide the analysis, the standard 1D techniques with the CPMG sequence as well as 2D correlation experiments were successfully applied and adapted to study properties of fluid-saturated …
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Physical characteristics and aquatic settlement properties of offshore drill-cuttings.
Drilling operations have been proven to cause pollution in the marine environment. From these environmental concerns, regulations and drilling muds evolved towards more environmental orientated operations. The environmental impact assessment is now compulsory and made public. In order to carry out …
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A Drill-and-Practice Plato Program for Teaching Formal Integration
Made available in DSpace on 2014-12-12T19:53:30Z (GMT). No. of bitstreams: 1 7606785.pdf: 4433088 bytes, checksum: 3f94d7af1df9d39986f01224785deb94 (MD5) Previous issue date: 1975
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Comparing the effects of drill-based interventions on multiplication fact acquisition
… schooling (Gersten, Jordan, & Flojo, 2005). Drillbased interventions effectively target and improve foundational academic skills (Burns, 2005), however, there is limited research examining drill-based interventions within the context of math facts and also a gap in the use of theoretical …
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