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Dissertations / Theses on the topic 'Mining Engineering and Metallurgy'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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1

Soejadi, Prijoko Prajitnoadi. "Participatory ergonomics in Indonesian tin mining." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52989/.

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Thousands of employees in small and medium-sized enterprises (SMEs) in Indonesia’s tin mining industry are working in dangerous environments without an adequate safety and health protection programme. Occupational safety (OS) has become a primary focal point when it comes to preventing dangerous incidents. Such incidents can lead to serious injuries and fatalities, particularly given that mining involves dangerous and high-risk activities, for example, in onshore tin mining, working in muddy areas with heat, humidity and a risk of landslide. Studies addressing the health and safety domain in I
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2

Ero-Phillips, Olubayode Oladiran. "Development of bi- and multicomponent fibres for tissue engineering by electrospinning." Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3587/.

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This project investigated the possibility of tailoring the crystallinity of electrospun fibres (crystallinity studies), and the electrospinning of bi- and multicomponent scaffolds of PLLA. During the crystallinity studies, the effects of various electrospinning process parameters on the crystallinity of electrospun poly(L-lactic acid) (PLLA) fibres were investigated. It was observed that the electrospun fibres had crystallinities between 23 and 46% while that for the as-received granule was 37%, suggesting that the crystallinity of electrospun fibres can be controlled by optimizing the electro
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3

Yünel, Ufuk. "A new concept on sampling systems by air cannon application." Ankara : METU, 2004. http://etd.lib.metu.edu.tr/upload/12604750/index.pdf.

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4

Güngör, Alper. "Occupational health and safety management tool." Ankara : METU, 2004. http://etd.lib.metu.edu.tr/upload/12604694/index.pdf.

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Thesis (Ph. D.)--Middle East Technical University, 2004.<br>Keywords: Accident Report Form, Accident Database, Occupational Diseases and Mine Accidents, Accident Reporting System, Health and Safety Management Tool.
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5

Mutlu, Yakıcı İçli Supervisor :. Güyagüler Tevfik. "A study on the application of e-commerce in Turkish mining industry." Ankara : METU, 2005. http://etd.lib.metu.edu.tr/upload/12605903/index.pdf.

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Thesis (M.S.) -- Middle East Technical University, 2005.<br>Keywords: e-commerce, mining sector, road map for e-commerce, strategy for e-commerce, steps of e-commerce, stages of e-commerce, application of e-commerce
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6

Banisi, Samad. "An investigation of the behaviour of gold in grinding circuits." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22400.

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A 7.6 cm (3") Knelson concentrator was used to estimate free gold content in samples extracted from industrial grinding and gravity circuits. Its recovery was comparable with that of amalgamation and the Mozley Laboratory Separator (MLS). It was then used for a study on gold grinding and classification behavior.<br>Laboratory studies of monosized gold and silica showed that gold produces fewer fines upon grinding: 75% of the mass reports to the next Tyler class, as opposed to 45% for silica. Disappearance from the monosized class (840-1200 $ mu$m) follows first order kinetics for both minerals
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7

Marchese, Mecklenburg Mario. "Hydrodynamic study of a downwards concurrent bubble column." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61167.

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The hydrodynamics of the downwards concurrent flotation column (CDFC) of the Jameson design has been studied. The effect of operating variables on the gas holdup in two- and three-phase mixtures was measured. To measure gas holdup, the isolating technique, conductivity and pressure techniques were employed. Gas fractions between 10 and 65% were achieved. These high holdups are a consequence of bubbles being forced downwards against their buoyancy. The high gas fraction may account for the fast flotation claimed for this cell.<br>The conductivity technique using Maxwell's equation gave a maximu
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8

Xiao, Jie 1964. "Testing a new gold centrifugal concentrator." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=20932.

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A new gold centrifugal concentrator, the Falcon SuperBowl, was tested both at plant and laboratory scales to assess its ability to recover gold from grinding circuits.<br>The performances of a 21-in SuperBowl (SB21) at Mineral Hill and New Britannia Mines showed that it could recover gravity recoverable gold (GRG) of all sizes, especially below 25 mum at Mineral Hill Mine.<br>Three types (to test the effect of gangue density and size distribution) of synthetic feeds were used to characterize a laboratory 4-in SuperBowl (SB4) as a function of feed rate and fluidization water flow rate.<br>A 20-
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9

Bogusz, Edwina J. "The mechanism of the depressant action of dextrin on pyrite." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23254.

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The separation of minerals by flotation depends on the effectiveness of the reagents used. The performance of depressants is paramount in rejecting the undesirable minerals while maintaining acceptable recoveries of the desired mineral. Iron-bearing minerals are the main contaminants in many ores: their removal is critical. Several different types of depressants have been used for this purpose, many of which are toxic. A shift has been made toward more environmentally friendly reagents including starch and dextrin.<br>The purpose of this thesis was to determine the depression mechanism of dext
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10

Sedore, Laila. "MgO rejection from Birchtree ore at Inco's Manitoba division." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81566.

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Birchtree is an ultramafic ore body and prior to 2003, represented one third of the production for Inco's Thompson operation. The ultramafic host rocks are high in MgO which, when processed through the smelter, promotes problems in the roasters and converters due to the high liquidus temperature. In October 2003, production from Birchtree mine ramped up to more than half of the total feed to the mill. The mill cannot produce a suitable concentrate for the smelter with current circuit configuration and operating practices. The target for the mill was to produce a nickel concentrate with
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11

Vincent, Frédérique. "A comparison of Knelson concentrator and jig performance for gold recovery /." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21333.

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A 7.6 cm Laboratory Knelson Concentrator was used to evaluate the performance of one jig circuit (Snip Operation), four Knelson Concentrators circuits (Meston, Est Malartic, Aurbel and Hemlo) and one classification circuit (Agnico-Eagle). To determine the size-by-size unit performance of all units, total and gravity recoverable gold contents were measured in the feed, concentrate, tails, underflow and overflow. Sample dilution with silica was used as a tool to enhance LKC recovery in samples with a high sulphide content.<br>The data generated from the Knelson and the jig was used in a model de
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12

Ward, Andrew. "Development of a lead-free aluminium bearing alloy using powder metallurgy manufacturing techniques." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/6418/.

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This study, completed with the University of Birmingham, was sponsored by Controls and Data Services (CDS) and the Engineering and Physical Sciences Research Council (EPSRC). A range of materials and processes were evaluated with the aim of producing a lead-free, monolithic, machinable plain bearing to replace the leaded bronze gear pump bearings currently used. The primary alloys investigated in this thesis were Al-20Sn-7Si-1Cu and an Al-20Sn-7Si- 1Cu-1Mg wt% composition; with the latter achieved by the controlled addition of Al- 50Mg wt% master alloy. The project identified an aluminium-tin-
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13

Khoshrou, Seyed Hassan. "Theoretical and experimental investigation of wall-control blasting methods." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40161.

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Overbreak and damage to rock walls is one of the most serious problems encountered in blasting operations. Several techniques have been developed to control the undesirable effects of rock blasting. These techniques are collectively known as wall-control blasting methods.<br>The stress distribution around pressurized holes has been numerically evaluated, in order to analyze the mechanism of wall-control blasting methods. The effect of blast geometry and the role of discontinuity on this stress field has also been studied in detail. The results obtained by numerical modelling have been verified
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14

Corujeira, Gallo Santiago. "Active screen plasma surface engineering of austenitic stainless steel for enhanced tribological and corrosion properties." Thesis, University of Birmingham, 2009. http://etheses.bham.ac.uk//id/eprint/275/.

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Low temperature plasma surface engineering has been a useful method for increasing the hardness and wear resistance of austenitic stainless steel without reducing the corrosion resistance of this alloy. Plasma carburising is of particular interest as it produces thicker hardened layers than plasma nitriding, and an equivalent improvement in the tribological and corrosion performance of the base material. In this project, the active screen (AS) plasma technique was used to carburise austenitic stainless steel AISI 316 and the obtained layer of carbon expanded austenite was compared with the one
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15

Zhang, Bo 1963. "Recovering gold from high density gangues with Knelson concentrators." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=20934.

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This research documents the use of a 7.6 cm laboratory Knelson Concentrator (LKC) to determine the amount of gravity recoverable gold (GRG) content in ores and evaluate the performance of gravity circuits, with an emphasis on high gangue density. Two approaches were used to minimize the effect of the high gangue density in estimating the GRG content, oversize removal and 2:1 ratio dilution with silica flour.<br>The amount of GRG was determined in four ore samples with an established protocol, yielding values of 35% to 78% of total gold.<br>Results from the Angnico-Eagle La Ronde Division (AELR
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16

Hasan, Muayad Mohammed. "Enhanced recovery of heavy oil using a catalytic process." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/53253/.

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Oil is a major source of energy around the world. With the decline of light conventional oil, more attention is being paid to heavy oil and bitumen, as a good alternative to light oil for energy supplies. Heavy crude oils have a tendency to have a higher concentration of metals and several other elements such as sulfur and nitrogen, and extraction of these heavy oils requires more effort and cost. The Toe-to-heel Air Injection catalytic upgrading process In-situ (THAI-CAPRI) is an integrated process which includes recovery and upgrading of heavy oil and bitumen using an air injection process,
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17

Rai, Subash. "Role of sulphur on carbon deposition on AGR fuel cladding steel." Thesis, University of Birmingham, 2019. http://etheses.bham.ac.uk//id/eprint/8882/.

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Filamentary carbon deposition on 20Cr/25Ni/Nb austenitic stainless steel from 1000-5000 ppm C2H4 in 1%CO/ bal. CO2 at 600°C has been investigated. This filamentary carbon deposition is catalysed by metallic nickel-rich particles formed intrinsically from the alloy during the early stages of oxidation. Samples were analysed using electron microscopy techniques. A simple model has been proposed to explain the formation of nickel-rich particles within the subsurface oxide layer. Furthermore, in this project the effect of COS, H2S and CH3SH on carbon deposition were examined. Addition of sulphur s
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18

King, David Gareth. "Fibre-optic sensor development for process monitoring of epoxy resins." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8698/.

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An investigation was undertaken to examine the performance of a Fresnel reflection sensor (FRS) incorporated into a differential scanning calorimeter (DSC) to track the cross-linking of epoxy resins. The initial design used a micrometer translation stage to lower the FRS through an orifice in the DSC platinum lid and onto the pan containing the sample. During exothermic cross-linking experiments, the resin refractive index and the heat evolved were measured simultaneously, allowing for direct comparison between the data. Combining the two measurement techniques produced a powerful hyphenated a
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19

Seymour, Andrew Richard Ian. "Optimisation of the fracture toughness of a novel ultra-high strength maraging steel." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8718/.

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This thesis details work that was carried out to optimise the fracture toughness and thermal stability of a new maraging steel called F1E. This steel was designed to precipitate Laves phase to improve the creep properties, and it was initially found that this was detrimental to toughness properties, and that further precipitation occurred during extended time at desired operating temperatures, embrittling the alloy. Initial work focussed on development of a heat treatment to stabilise the Laves phase, using a slow cool to the service temperature to fully precipitate the equilibrium volume frac
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20

Mohammed, Ameen Rayan Basheer. "Plastic deformation of Ti-6Al-4V at small scale : a microstructural and mechanistic study." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7901/.

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Two phase alpha/beta titanium alloys are used in a wide variety of applications such as aerospace, biomedical, gas turbine engine, sport and energy. These alloys have high specific strength and specific modulus as compared to magnesium and aluminium alloys as well as excellent corrosion resistance. The Ti-6Al-4V (α+β) alloy is the most widely used and the best known of all the Ti alloys. Although there are a number of observations in the literature reporting the mechanical responses of these two phase alloys, there exists very little understanding of the mechanisms of the individual phases and
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21

Ariza-Zafra, Karol. "Improving performance of discharge equipment for coals with poor handling characteristics." Thesis, University of Greenwich, 2015. http://gala.gre.ac.uk/21539/.

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The accepted design techniques for bulk solids handling equipment are frequently overlooked during the installation of industrial process plants. As a result, flow unreliability is often observed in silos in the form of flow stoppages, product bulk density variations, formation of rat-holes, flushing, flooding and product segregation. In most cases when these problems are detected in silos, they are the result of a discharge pattern known as core flow, where localised flow channels promote the preferential draw of material from certain zones of the silo, with the rest of the material remaining
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22

Chan, Park Hinn. "Design study of composite repair system for offshore riser applications." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/33455/.

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Risers in offshore operations are subjected to corrosion during their service life cycle. The use of relatively inexpensive, high strength to weight ratio fibre reinforced polymer composite (FRPC) as a load bearing pipe repair sleeve is an emerging technology that is becoming common for offshore applications. Risers experience complex loading profiles and experimental investigations often incur substantial time, complicated instrumentation and setup costs. The main aim of this research is to develop a design tool for the repair of offshore riser that suffers from external corrosion damage on i
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23

Lam, Wing Cheong Marc F. "Experimental and numerical investigations into the behaviour of a 7175-T7351 aluminium alloy for aerospace gearbox housing applications at elevated temperatures." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/49366/.

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The 7175-T7351 aluminium alloy was studied to determine its suitability for the step-aside gearbox housing on the Rolls Royce Trent 1000 engine. The industrial motivation of this work was to reduce the weight of the gearbox housing using this lightweight material to ultimately improve the specific fuel consumption of the aircraft. This involved obtaining the mechanical properties of the aluminium alloy via a series of uniaxial mechanical tests with parameters based on the operating conditions of the gearbox housing during a typical flight cycle. Furthermore, a constitutive viscoplasticity mode
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24

Naylor, A. W. "The cultural and historical geographies of onshore oil exploration in the British East Midlands during the 20th century." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/35862/.

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This thesis tells the hitherto neglected story of onshore oil exploration in the British East Midlands from 1908 to 1964. Drawing on a series of case studies it provides a regional historical geography, connecting science and industry to the exploratory field science of geology. During the period examined, two low key discoveries – Hardstoft, in Derbyshire (1919), and Eakring, in Nottinghamshire (1939) - altered Britain’s energy prospects, supplementing coal with liquid mineral oil. Using archival research methods and oral testimonies, the thesis reveals how a diverse assemblage of earth scien
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25

Ziegelmeier, Stefan. "Process analysis and material behavior of thermoplastic elastomers throughout the laser sintering processing chain." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/31532/.

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Laser sintering (LS), an additive manufacturing (AM) technology, allows for the production of 3-dimensional parts by fusing together successive layers of polymer powder without the need for tooling. Its potential and applicability, however, is still constrained due to the limited repertoire of materials available and the lack of detail in understanding both the important process-material interactions and consequently the requirements for the development of new materials. Past research has mainly focused on polyamide 12 (PA12) as the standard material, hence most of the empirically grown or the
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26

Imbaby, Mohamed. "Fabrication of 316-L stainless steel and composite micro machine components using softlithography and powder metallurgy process." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/1212/.

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This thesis presents a new approach to fabricate high precision micro machine components from stainless steel and stainless steel ceramic composite materials, using Softlithography and powder metallurgy processes. Three different 316-L stainless steel powders, including 5, 10 and 16 μm in size, and two different ceramics powders, including 400 nm alumina and 320 nm titania, were tested. The PhD research process can be divided into three main stages. In the first stage, high quality SU-8 master moulds and their negative replicas soft moulds are produced using Softlithography technique. The seco
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27

Mitchell, Colin A. "A study of the powder processing, tribological performance and metallurgy of Aluminium-based, discontinuously reinforced metal matrix composites." Thesis, Edinburgh Napier University, 2002. http://researchrepository.napier.ac.uk/Output/3807.

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The principal objectives of the research reported in this thesis are: to determine the effect that sinter time has on the metallurgical behaviour of alumina-reinforced aluminium-606lmatrix composites; compare and assess the wear resistance of alumina and silicon carbide reinforced aluminium 6061-matrix composites, together with monolithic aluminium 6061 alloy; determine the effect that reinforcement particle size has on the wear resistance of aluminium 6061-matrix composites; identify the relative merits of two techniques for depositing copper coatings on to alumina reinforcements. Through inv
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28

Buhagiar, Joseph. "Plasma surface engineering and characterisation of biomedical stainless steels." Thesis, University of Birmingham, 2008. http://etheses.bham.ac.uk//id/eprint/3744/.

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Low temperature plasma surface alloying with nitrogen (nitriding), carbon (carburising) and both (carbonitriding) has been successfully employed in hardening medical grade ASTM F138, ASTM F1586 and ASTM F2581 as well as engineering grade AISI 316 by the formation of a modified layer better known as S-phase or expanded austenite. In this study, systematic plasma treatments and characterisation were performed on medical grade stainless steel in order to establish the optimised treatment conditions, especially temperature, which can maximise the hardened case depth without any detriment in corros
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29

Demers, Isabelle. "Activated silica sol as a flocculant in treatment of mine effluents." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79227.

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Lime neutralization of acidic drainage is the most common process to produce an environmentally acceptable effluent. The process involves neutralization, precipitation of metal hydroxides, flocculation, settling and storage of the sludge. The sludge is not entirely stable over the long term due to the natural pH decline in the storage area that can re-solubilize metals. The use of activated silica sol could be an alternative to flocculants in the lime neutralization process. The nature of the metal hydroxide---silica bond could make the sludge more stable on short and long term.<br>It w
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30

Wardle, Peter. "The selective heating of pyrite in coal using microwave energy." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/12017/.

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The objective of this research project was to investigate the effect of microwave treatment on the conversion of pyrite in coal in order to enhance its magnetic properties and to aid subsequent desulphurisation by magnetic separation. Key areas of this investigation include:- a review of the fundamental theoretical aspects of heating in an applied microwave field, a detailed literature survey of the potential applications of microwave heating to aid coal desulphurisation, a study of the transformation mechanisms of pyrite by microwave and conventional heating methods, a comprehensive review of
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31

Kobusheshe, Joseph. "Microwave enhanced processing of ores." Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/11393/.

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Recent research developments have suggested that microwave assisted comminution could provide a step change in ore processing. This is based on the fact that microwave-absorbent phases within a multi-mineral ore can be selectively heated by microwave energy hence inducing internal stresses that create fracture. A detailed review of existing literature revealed that little or no information is available which relates and examines the influence of hydrated minerals on microwave assisted fracture despite the fact that most important ores are associated with phyllosilicates, the vast majority of w
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32

Avila, Claudio. "Predicting self-oxidation of coals and coal/biomass blends using thermal and optical methods." Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/12710/.

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Self-oxidation and spontaneous combustion of coals is a problem of global concern. There are social, economic and environmental costs associated with this phenomenon and major incidents can, in extreme cases, lead to human casualties. More often however, damage is made to commercial facilities, the calorific value of the fuel is reduced and substantial release of noxious gases, particulate matter and CO2 may contribute to local and international pollution levels. This problem is not only restricted to coals, it also affects other carbonaceous materials such as biomass and potentially coal-biom
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33

Brown, Robert Alexander. "The combustion of titanium powder in air and iron oxide." Thesis, University of Nottingham, 2000. http://eprints.nottingham.ac.uk/28106/.

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The quest for ever stronger and tougher steels has lead to an interest in the 'Acicular Ferrite' microstructure, its chaotic and disordered morphology imparting a high degree of toughness to the steel. To date, only complex and expensive materials and manufacturing processes have formed acicular ferrite within bulk cast steel. As such, the thrust of this research is to produce a cheap steel addition, an iron - titanium oxide metal-ceramic composite, that will facilitate the formation of acicular ferrite in conventionally manufactured bulk cast steels. The Self-propagating High-temperature Synt
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34

Jia, Yudan. "Numerical modelling of shaft lining stability." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/11924/.

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This research project focuses on the application of numerical modelling methods to rock mechanics problems, combining theoretical, experimental and numerical modelling work. Specifically, practical finite difference modelling approach for analysing shaft lining stability through the Marl and Potash strata at Boulby mine UK has been developed using the commercially available software FLAC2D/FLAC3D (ITASCA 2008). A soft rock Marl occurs close to the bottom of the two deep shafts at the mine. Both shafts concrete linings through this stratum have suffered considerable pressure, which has caused g
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35

Azri, Mohammad Hazwan. "Accessing the extent of kerogen/bitumen interactions on source rock maturation and hydrocarbon generation." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13519/.

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In order to ascertain whether kerogen and the heavy oil or bitumen generated during the initial stages of source rock maturation then go on to produce similar gas yields compared to the natural situation when they are present in source rocks, a study has been conducted on an immature type II Kimmeridge Clay Formation (KCF) source rock (Dorset, United Kingdom) with different total organic carbon contents (14, 25 and 30 % TOC), and all having an initial vitrinite reflectance (VR) of approx. 0.4 % Ro. Anhydrous and hydrous pyrolysis experiments were conducted on the whole immature source rock, th
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36

Silvester, Stephen. "The integration of CFD and VR methods to assist auxiliary ventilation practice." Thesis, University of Nottingham, 2002. http://eprints.nottingham.ac.uk/10003/.

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The current trend towards the adoption of retreat longwall mining methods and the associated rapid development of the access drivages has exacerbated the environmental conditions experienced within these workings. The combined use of roof bolt and continuous miner systems has improved the face advance rate within rapid development drivages. In order to maintain adequate dust and gas control it is essential that the auxiliary ventilation and monitoring systems are correctly installed and maintained. The causes of many potential environmental hazards experienced within auxiliary ventilated rapid
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37

Marshall, Christopher John. "Palaeogeographic development and economic potential of the coal-bearing palaeocene Todalen Member, Spitsbergen." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13794/.

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Palaeocene high-latitude coals from the Todalen Mbr. Central Tertiary Basin, Svalbard present an opportunity to understand the processes which controlled Arctic peat formation. Coals from this region have produced sub-economic quantities of bitumen during the 1920’s. Previous palaeogeographic models show significant variation between studies favouring deltaic and tidal wetland conditions. In addition, coal geochemistry studies have been limited to characterisation with little integration with palaeogeographic studies. This study utilises a large database of drill-logs to create cross sections
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38

Hastings, Philip John. "The behaviour of short fatigue cracks in a beta-processed titanium alloy." Thesis, University of Nottingham, 1989. http://eprints.nottingham.ac.uk/28458/.

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An investigation has been made into the behaviour of short fatigue cracks in the β-processed titanium alloy, Ti6Ss. The effect on the material of a number of different variables was studied, particularly microstructure, as well as stress level, specimen design and specimen size. Initiation of cracks was found to occur at similar microstructural features in smooth specimens, regardless of a-platelet morphology. Cracks initiated from slip bands across small bundles of α-platelets, despite the presence of longer, more intense slip bands across α-colonies. α-platelet morphology was found to have a
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39

Bolingbroke, Richard Kendall. "The growth of short fatigue cracks in titanium and aluminium alloys." Thesis, University of Nottingham, 1988. http://eprints.nottingham.ac.uk/28452/.

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An investigation has been made of the growth of An investigation has been made of the growth of short fatigue cracks in aluminium and titanium alloys, with special emphasis on the effects of microstructure. For the commercial aluminum alloys examined (7010 and 2014A) a degradation in short fatigue crack resistance accompanied an increase in the degree of ageing, as is commonly reported for long, through thickness cracks. The short cracks however, were seen to propagate at substantially faster rates than conventional, long cracks at the same apparent applied ΔK and R - ratio. The similar, facet
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40

Pereira, Igor S. M. "Microwave processing of oil contaminated drill cuttings." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/28515/.

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Easily accessible oil reserves are currently decreasing, leading to an increase in more complex offshore deep-sea drilling programs, which require increasingly greater depths to be drilled. Such wells are commonly drilled using oil based muds, which leads to the production of drilled rock fragments, drill cuttings, which are contaminated with the base oil present in the mud. It is a legal requirement to reduce oil content to below 1 wt% in order to dispose of these drill cuttings in the North Sea and microwave processing is suggested as a feasible method of achieving the desired oil removal. H
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41

Whitaker, Iain Robert. "The structure and properties of autogenous laser beam welds in aluminium alloys." Thesis, University of Nottingham, 1994. http://eprints.nottingham.ac.uk/28427/.

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Autogenous laser beam welds were made in sheets of the aluminium alloys 8090, 8009 and 6061. The Al-Li based alloy 8090 was subjected to both continuous wave CO2 and pulsed Nd:YAG thermal cycles with average powers of 1.5-3.8 kW and 0.8- 0.9 kW respectively. The two techniques were compared for their influence on the 8090 solidified weld pool shape, the fusion zone microstructure and microhardness, the HAZ and the susceptibility of the fusion zone to post-weld heat treatment. It was found that CO2 keyhole welding is preferable to Nd:YAG welding, under the welding conditions investigated, as es
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42

Moll, A. T. J. "A study of optimisation methods applied to methane recovery and mine ventilation systems." Thesis, University of Nottingham, 1993. http://eprints.nottingham.ac.uk/29386/.

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The current trends towards increased coal production from seams at greater depth has led to increased demands being placed on the methane drainage and mine ventilation systems. This study has been directed towards the development of computer models to simulate and analyse the gas flows in methane drainage ranges and the airflow and pressure distribution in mine ventilation networks. The first part of this thesis describes the conventional techniques of methane drainage currently employed and the mathematical approach used to model gas flow in the methane drainage range. It also discusses how,
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43

Howes, Michael. "The design and control of mine refrigeration systems." Thesis, University of Nottingham, 1992. http://eprints.nottingham.ac.uk/29325/.

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The research is directed towards modelling the chiller set, the heat rejection and the load subsystems of a complete mine refrigeration system and simulating the performance in order that the design can be optimised and the most cost effective control system determined. The refrigeration load profile for a mechanised mine is complex and primarily a function of surface climatic variations, the strongly cyclic sources of heat resulting from the operation of diesel powered mining equipment and the associated differences in thermal environmental acceptance criteria. Modelling of the central elemen
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44

Schofield, Damian. "Surface mine design using intelligent computer techniques." Thesis, University of Nottingham, 1992. http://eprints.nottingham.ac.uk/13113/.

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Surface mine planning involves the results of algorithmic numerical calculations being used by engineers to make informed decisions relating to the design. The Department of Mining Engineering at the Unversity of Nottingham has in the past been involved in developing modular algorithmic packages. The emphasis of the computer research has now altered. Smaller specialised systems are now being developed to cover individual aspects of the design process. Artificial intelligence techniques are being introduced into the mining environment to solve the planning problems often associated with the lar
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45

Fair, G. H. "The effect of shot peening on fatigue and fretting-fatigue of aluminium alloys." Thesis, University of Nottingham, 1988. http://eprints.nottingham.ac.uk/12723/.

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Plain-fatigue and fretting-fatigue tests have been carried out on the two peak-aged, high-strength aluminium alloys, 7010 and 8090, in the unpeened and shot peened conditions. Shot peening produced a highly deformed surface containing many deep dimples and folds from which fatigue cracks rapidly initiated. Although initiation was early, propagation through the peened surface layers was retarded by the residual compressive stresses introduced by the peening treatment; this retardation being greatest at a depth corresponding to that of the peak residual compressive stress. Shot peening improved
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46

Moloney, Kenneth W. "An analysis of airflow patterns in auxiliary ventilated drivages." Thesis, University of Nottingham, 1997. http://eprints.nottingham.ac.uk/12364/.

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In recent years the drivage advance rates achieved within the UK coal industry have increased. In the 1980's average drivage rates were 35m per week compared to the 100/150m per week possible today. These extended rates of advance have resulted in an increase in the potential methane, dust and heat generation within the vicinity of the drivage face. In order to effectively disperse this additional pollutant load a controlled increase in air quantity is required. Although advance rates have changed, current auxiliary ventilation practice has not. UK mining law requires that the fresh air must b
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47

Dixon, Darron William. "A statistical analysis of monitored data for methane prediction." Thesis, University of Nottingham, 1992. http://eprints.nottingham.ac.uk/12977/.

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This research describes an investigation into the application of a statistical method for the prediction of methane concentration in longwall coal districts. An important and necessary part of the research was the acquiring of representative mine environmental and coal production data and a number of shortcomings were identified in this area. The monitored data was used to build univariate time series models of general air body methane concentration, air velocity, barometric pressure, coal production and methane drainage variables of varying timescales according to the Box-Jenkins method of ti
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Al-Harahsheh, Mohammad. "A fundamental investigation into the microwave assisted leaching of sulphide minerals." Thesis, University of Nottingham, 2005. http://eprints.nottingham.ac.uk/11075/.

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Microwave assisted leaching has been investigated in an attempt to improve both the yield of extracted metal and reduce processing time. This is especially pertinent in view of the increased demands for metal and more environmentally friendly processes. This work reports a fundamental study on the influence of microwave energy on the dissolution of sulphide minerals. Chalcopyrite and sphalerite were chosen as model materials due to their economic importance and the diversity of their heating behaviour in a microwave field (chalcopyrite being an excellent microwave heater and sphalerite being a
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49

Wang, Jun. "The stress-strain and strength characteristics of Portaway Sand." Thesis, University of Nottingham, 2005. http://eprints.nottingham.ac.uk/10170/.

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Despite the large number of modifications proposed to the standard Cam-clay models over the last three decades, the critical state concept has been much less successful for modelling sand behaviour. This thesis is concerned with understanding the stress-strain and strength characteristics of Portaway sand, a quartz sand, and the validity of several recently developed critical state models formulated in terms of the state parameter concept. The laboratory investigation consisted of the evaluation and modification of two triaxial systems and 83 triaxial tests performed under monotonic and cyclic
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Rowsell, Philip J. "The automatic optimisation of drilling performance." Thesis, University of Nottingham, 1991. http://eprints.nottingham.ac.uk/11909/.

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The drilling industry, along with many others, is becoming increasingly competitive, demanding greater efforts to improve safety and reduce costs. For this reason, companies are progressively looking towards computerised automation to enhance performance. Unlike most industries however, the drilling industry has been slow to take advantage of the advances in computer and automation technology. Only recently have automatic operations such as tubular handling been placed under computer control. These activities relate to peripheral mechanical handling problems which are relatively easy to solve.
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