Tesis sobre el tema "Coal properties"
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Moreea, Ruksana Goolam Hossen. "Effects of solvents and coal properties in coal liquefaction". Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324958.
Texto completoBoykov, Nikolay D. "Measurements of the electrical properties of coal measure rocks". Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4715.
Texto completoTitle from document title page. Document formatted into pages; contains xi, 89 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 88-89).
Walker, Rachel Inez. "Insights into the coking behavior of southern Indiana coals bulk coal properties and individual maceral chemistries /". [Bloomington, Ind.] : Indiana University, 2005. http://wwwlib.umi.com/dissertations/fullcit/3167284.
Texto completoTitle from PDF t.p. (viewed Dec. 3, 2008). Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1355. Co-Chairs: Maria Mastalerz; Simon Brassell.
Oztoprak, Ayse Feray. "Investigation Of The Rheological Properties Of Cayirhan Coal-water Mixtures". Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607861/index.pdf.
Texto completoayirhan lignite were prepared to optimize the parameters of CWM having an ideal behavior which means that at maximum coal loading, relatively stable at static and dynamic conditions and exhibit low viscosity. For this purpose, the effect of the parameters such as pulp density, amount of chemical agents, particle size distribution, addition of methanol and pulp pH were investigated. Results showed that increasing pulp density negatively affects viscosity and allowable maximum pulp density was obtained as 60% when the particle size distribution has a d50 value of 22.82 µ
m. The optimum amount of chemical agent was found as 0.9%, having 10% Na-CMC (Sodium Carboxymethyl Cellulose) and 90% PSS (Polystyrene Sulfonate). Minimum viscosity was achieved when the pulp pH was in natural conditions (pH=6.85). Addition of methyl alcohol increased the viscosity of CWM.
Man, Chi-Keung. "Some properties of cokes produced from high pressure carbonisation of coals". Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/11844.
Texto completoHeidenreich, Craig. "Mathematical modelling of large low-rank coal particle devolatilization /". Title page, summary and contents only, 1999. http://web4.library.adelaide.edu.au/theses/09PH/09phh4653.pdf.
Texto completoSloan, Elizabeth Patricia. "The influence of feedstock properties on gasification plant performance". Thesis, University of Ulster, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241681.
Texto completoGurgenli, Hakan. "Geomechanical and weathering properties of weak roof shales in coal mines". Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4717.
Texto completoTitle from document title page. Document formatted into pages; contains ix, 99 p. : ill. (some col.), maps (part col.). Includes abstract. Includes bibliographical references (p. 77-81).
Stewart, Barry Robert. "Physical and chemical properties of coarse coal refuse from Southwest Virginia". Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-03142009-040755/.
Texto completoStewart, Barry R. "Physical and chemical properties of coarse coal refuse from Southwest Virginia". Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/41626.
Texto completoMaster of Science
Sadr-Kazemi, Naheed. "Estimation of coal flotation performance and froth properties using image processing". Thesis, University of Manchester, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.682189.
Texto completoPopovych, V. V., K. V. Stepova, A. Voloshchyshyn y P. V. Bosak. "Physico-Chemical Properties of Soils in Lviv Volyn Coal Basin Area". Thesis, EDP Sciences, 2019. http://hdl.handle.net/123456789/6236.
Texto completoPandey, Rohit. "Changes in properties of coal as a result of continued bioconversion". OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1745.
Texto completoHall, P. J. "The macromolecular chemistry of coals". Thesis, University of Newcastle Upon Tyne, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377435.
Texto completoSinka, Iosaf Csaba. "An investigation into rock and reservoir properties of coal with special reference to simulated coalbed methane performance". Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299244.
Texto completoErdogan, Sinem Setenay. "A Preliminary Study On The Use Of Reservoir Simulation And Coal Mine Ventilation Methane Measurements In Determining Coal Reservoir Properties". Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613047/index.pdf.
Texto completoeltek Coal Mine, which is located in Suluova basin, Amasya, and contains thick, laterally extensive Lower Eocene coal seams, were integrated within a numerical vi reservoir model. Key reservoir parameters for history matching are cleat permeabilities, cleat porosity, diffusion time and Langmuir volume and Langmuir pressure. Thirteen cases were studied. According to the results, Case-10 determined as the best fitted case for both of the production wells. Cleat permeabilities and Langmuir pressure were the most effective parameters. Reservoir parameters matched are cleat permeabilities of 5, 4 and 1 md and fracture dimensions of 0.8, 0.4, and 0.1 m in x, y and z direction respectively, 2 % cleat porosity, 0.3 % water saturation. Diffusion time was determined as 400 days and 2000 kPa Langmuir volume and 6.24279 m3 /tone gas content estimated. According to these results it can be said that methane production will not be economically feasible, however
to remedy underground working conditions and safety of workers methane management should be taken into consideration.
Johnson, Angelo Gerald. "Assessing the change in hydro-geochemical properties of fly ash over time when disposed into opencast coal mines in Mpumalanga, South Africa". University of the Western Cape, 2019. http://hdl.handle.net/11394/6927.
Texto completoEskom supplies to 95% of South Africa’s energy needs and it primarily comes from coal combustion at their coal–fired power stations. Large volumes of fly ash are generated at these coal-fired power stations as a by-product of the coal combustion process. Fly ash is disposed onto landfills at the respective power stations and these landfills are currently running out of storage space. Subsequently, there are concerning environmental impacts upon the natural water environment resulting from coal mining. More specifically, the discharge of acid mine (AMD) water from historical coal mines impact negatively on the water quality in the nearby rivers and dams in the Witbank area. Therefore, as a consequence of the limited space at fly ash landfills, Eskom has embarked on finding alternative ways to re-use fly ash in different applications such as: soil amelioration and land reclamation, road construction as well as brick and cement development. This study focussed on the feasibility of disposing fly ash into the backfill of historical and future coal mines with the intention to firstly reduce fly ash disposal at existing landfills and secondly to improve the decant water quality of the coal mines in the Witbank area. Globally, fly ash has been successfully used in mine backfilling and AMD treatment in countries such as United States of America and India, due to cementitious properties of their fly ash. However, there is limited knowledge on how South African fly ash would behave under backfilled conditions of opencast coal mines where it will be exposed to acidic water environments. This is due to the fact that South African fly ash is considered a Level 3 type hazardous waste, due to its heavy metal concentrations. This waste classification is unique and the strictest compared to global classifications and these methodologies specify that fly ash should be disposed onto lined waste disposal sites due to the potential leaching of heavy metals from these waste sites. It is important to understand the hydrogeological and hydro-geochemical properties of fly ash over time once it is exposed to acid mine water. Field and laboratory tests were conducted to understand these hydrogeological and hydro-geochemical properties of fly ash. Falling head hydraulic tests were conducted at two existing ash landfill sites to determine the hydraulic conductivity (K) of ash of different age. The results exhibit a decreasing trend in K with increasing age. This is due to the pozzolanic nature of fly ash and secondary mineralization of gypsum which causes the fly ash to harden in the presence of water from irrigation for dust suppression together with precipitation over time. Laboratory testing included the use of constant head Darcy column tests to determine the change in K and geochemical properties of the leachate over time. Natural AMD with a pH of 2.5 and a metal composition was used as influent and the leachate were routinely collected and analysed for metal concentrations. The hydraulic conductivity of the fly ash showed a decreasing trend over time. During the placement of coal ash, the moisture allows pozzolanic reactions to solidify the coal ash and lowers the K, towards 10-1 m/d, relative to fresh ash. Secondary mineralization of calcium minerals, in the coal ash contributes to a further decrease in the K, by another order of magnitude from 10-1 m/d towards 10-2 m/d. Sulphate and iron minerals from the AMD also played a major role in the decreasing K as they accumulate in void spaces and having a clogging effect, decreasing the K to 10-3 m/d. The alkaline nature of the coal ash initially neutralizes the acidic levels of AMD from an inflow pH = 2.5 to an outflow pH = 11. Acidification of the outflow towards a pH = 4 was observed, due to large volumes of AMD (>80 000 mL) flowing through short coal ash columns. The K decreased to 3 orders of magnitude, from an initial 10-1 m/d to 10-3 m/d, with the AMD iron (>150 mg/L) and sulphate concentration (>2000 mg/L) playing the dominant role in reducing the hydraulic conductivity. From the geochemical leach test results, it was observed that most of the leachate water was of a better quality than the influent AMD water quality. The outflow pH (pH = 11 to pH = 4) was higher than the pH of the inflow AMD (pH = 2.5). Overall EC reduced in discharge compared to inflow AMD (ECinflow: 535 – 545 mS/m versus ECoutflow: 350 – 490 mS/m), although Na and K in the leachate exhibited higher concentrations (10+2 mg/L) compared to the AMD inflow concentrations (10+1 mg/L). However, most of the other chemical elemental concentrations such as Fe (10-2 – 10+1 mg/L), Si (10-2 – 100 mg/L), Al (10-2 – 10+1 mg/L), Mn (10-2 – 10+1 mg/L), Cr (10-3 – 100 g/L) and SO4 (10+2 – 1+3 mg/L) in the discharge showed lower concentrations when compared to the inflow Fe (10+2 mg/L), Si (100 mg/L), Al (10+1 mg/L), Mn (10+1 mg/L), Cr (10-2 mg/L) and SO4 (10+3 mg/L) concentrations. These results show how fly ash backfill may impact on the current coal mining environment. Overall, the laboratory hydraulic conductivity and geochemical testing showed promising results for fly ash backfilling. Based on this research, fly ash can be used to alter the existing coal mining environment as it is currently known in the Witbank area. The topography, hydraulic conductivity and the water table within the backfill can be altered to improve decant water quality of ash backfilled coal mines.
Han, Bing. "Studies of metallurgical coke behaviour and properties under conditions relevant to the bosh and deadman regions of a blast furnace". Thesis, Loughborough University, 1993. https://dspace.lboro.ac.uk/2134/28134.
Texto completoBlock, Pamela Rose. "Monitoring the Effects of Surface Coal-Mine-Reclamation on Soil Biological Properties". Thesis, North Dakota State University, 2019. https://hdl.handle.net/10365/29272.
Texto completoNorth Dakota Industrial Commission Lignite Energy Counsel
Zhang, Yihuai. "Microstructure and Nanoscale Rock Mechanical Properties of Coal: Applications to CO2 Storage". Thesis, Curtin University, 2017. http://hdl.handle.net/20.500.11937/65384.
Texto completoVosolo, David A. "Investigation on geotechnical engineering properties of coal mine spoil subjected to slaking". Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/109789/1/David_Vosolo_Thesis.pdf.
Texto completoNewman, J. "Paleoenvironments, coal properties and their interrelationship in Paparoa and selected Brunner coal measures on the West Coast of the South Island". Thesis, University of Canterbury. Geology, 1985. http://hdl.handle.net/10092/4904.
Texto completoBadenhorst, Mathys Johannes Gerhardus. "A study of the influence of thermal drying on physical coal properties / M.J.G. Badenhorst". Thesis, North-West University, 2009. http://hdl.handle.net/10394/3989.
Texto completoThesis (M.Ing. (Chemical Engineering))--North-West University, Potchefstroom Campus, 2010
Adeboye, Oyeleye Oluwafemi. "Effects of coal composition and fabric on porosity, sorption capacity and gas flow properties in Western Canada Sedimentary Basin coals". Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/31137.
Texto completoYu, Hao. "GEOTECHNICAL PROPERTIES AND FLOW BEHAVIOR OF COAL REFUSE UNDER STATIC AND IMPACT LOADING". Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1416587316.
Texto completoPhillips, Lakin N. "Evaluation of Ohio Coal as Filler Material for Thermoplastic Composites". Ohio University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1512564409202248.
Texto completoBrock, D. A. "Gateroad support design and its relationship with the properties of the immediate rock mass". Thesis, University of Strathclyde, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382232.
Texto completoCraig, Nina Genevieve. "Properties and Potentials of Coal Mine Soils in Southwest Virginia 29 Years After Establishment". Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/19255.
Texto completoMaster of Science
Bastola, Subash. "Shear strength and stiffness properties of bedding planes and discontinuities in coal measure rocks". OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1655.
Texto completoKong, Lingjun. "Characterization of Mineral Oil, Coal Tar and Soil Properties and Investigation of Mechanisms That Affect Coal Tar Entrapment in and Removal from Porous Media". Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5093.
Texto completoJameson, David Edwin. "The occurrence and properties of intraformational weak horizons in the coal measures of Northern England". Thesis, University of Newcastle Upon Tyne, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283941.
Texto completoBarkhordarian, A. "Laboratory studies of pumping characteristics of processed liquid tailings with particular reference to stability and time dependant properties". Thesis, University of Nottingham, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384642.
Texto completoSpero, Christos. "The influence of coal properties on the grinding and wear characteristics of ring-and-ball pulverisers". Thesis, Queensland University of Technology, 1989. https://eprints.qut.edu.au/36451/1/36451_Spero_1989.pdf.
Texto completoAllen, Tristan. "Susceptibility of rehabilitated mine batter surface to mass movement". Thesis, Federation University Australia, 2018. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/168528.
Texto completoMasters by Research
Bode-Jimenez, Gabriel. "ASSESSMENT OF POTENTIAL IMPACTS TO SUBSURFACE BODIES OF WATER DUE TO UNDERGROUND COAL MINING". UKnowledge, 2017. http://uknowledge.uky.edu/mng_etds/35.
Texto completoBalan, Huseyin Onur. "Modeling The Effects Of Variable Coal Properties On Methane Production During Enhanced Coalbed Methane Recovery". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609622/index.pdf.
Texto completoJÃnior, Francisco Necy Alves. "Evaluation of mechanical properties of gypsum with the incorporation of the products of coal combustion". Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15321.
Texto completoThe accelerated industrial development of recent decades has been touted as one of the most impacting factors on the environmental imbalance. For this reason, research has been developed aiming, among other objectives, the reuse of waste generated by industrial processes as raw materials or inputs in other processes. This study aims to investigate the viability of using waste generated by the combustion of coal in power plants as an additive in the production of gypsum parts for construction. Coal combustion products (CCP) are already being applied in the construction industry as an additive in concrete, but their use in gypsum masses is very limited, which motivated the current reseach project. Initially the influence of water by varying the addition on mass in 5 levels between 10 and 50% was evaluated in order choose the best ratio water / gypsum about the mechanical properties. The materials used were characterized by fluorescence spectroscopy X-ray (XRF), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and energy dispersive X-ray (EDS) and scanning electron microscopy (SEM). The production process used for making the specimens was the so-called UCOS (portuguese acronym for the initials of wetting, compaction and drying), with pressure of 10 MPa. Then, test pieces were prepared with incorporation of PCC to the mass of gypsum in 5 levels between 10 and 50% to analyze the influence of these additions on mechanical properties, which was evaluated by compression tests, hardness and three point bending. The results determined that the water/gypsum (a/g) that provides the best mechanical properties is 0.2, which is used in the evaluation stage of the specimens with addition of PCC. It was concluded that, in general, increasing the incorporation of the waste was damaging to the mechanical properties of the gypsum block. Nonetheless, the studied conditions meet the requirements of NBR 13207, except for the condition with incorporation of 50% of PCC. In general, the mechanical properties behaved in similarly conditions between 10 and 20% of PCC, but the evolution from 20 to 30% caused a significant decrease in the results. Thus, it is concluded that the condition of 20% PCC in plaster and ratio a/g 0,2 meets the standard, ensures recycling of waste and, due to the pressing process, has better mechanical strength compared to the usual products.
O acelerado desenvolvimento industrial das ultimas dÃcadas tem sido apontado como um dos fatores mais impactantes sobre o desequilÃbrio ambiental. Por esse motivo, pesquisas vÃm sendo desenvolvidas visando o reaproveitamento dos resÃduos gerados pelos processos produtivos industriais como matÃrias-primas ou insumos em outros processos. Este trabalho objetiva investigar a viabilidade de se utilizar um resÃduo gerado pela combustÃo de carvÃo mineral em usinas termoelÃtricas como aditivo na produÃÃo de peÃas de gesso para a construÃÃo civil. Este produto da combustÃo de carvÃo (PCC) jà vem sendo aplicado nas indÃstrias de construÃÃo civil como aditivo em cimento, porÃm sua utilizaÃÃo em massas de gesso à bastante restrita. Inicialmente foi avaliada a influÃncia da Ãgua pela variaÃÃo da sua adiÃÃo à massa de gesso em 5 nÃveis entre 10 e 50%, visando escolha da melhor relaÃÃo Ãgua/gesso quanto Ãs propriedades mecÃnicas. Os materiais utilizados foram caracterizados por espectroscopia de fluorescÃncia de raios-X (FRX), difraÃÃo de raios-X (DRX), espectroscopia de absorÃÃo no infravermelho por transformada de Fourier (FTIR) e de energia dispersiva de raios-X (EDS) e microscopia eletrÃnica de varredura (MEV).O processo produtivo utilizado para confecÃÃo dos corpos de prova foi o de Umedecimento, CompactaÃÃo e Secagem (UCOS), com pressÃo de 10 MPa. Em seguida, foram confeccionados corpos de prova com incorporaÃÃo de PCC à massa de gesso em 5 nÃveis, entre 10 e 50% com a finalidade de analisar a influÃncia dessas adiÃÃes sobre as propriedades mecÃnicas, o que foi avaliado por ensaios de compressÃo, dureza e flexÃo em trÃs pontos. Os resultados obtidos determinaram que a relaÃÃo Ãgua/gesso (a/g) que fornece as melhores propriedades mecÃnicas à a de 0,2, sendo esta utilizada na etapa de avaliaÃÃo dos corpos de prova com incorporaÃÃo de PCC. Concluiu-se que, em geral, a crescente incorporaÃÃo do resÃduo foi danosa Ãs propriedades mecÃnicas do bloco de gesso. NÃo obstante, as condiÃÃes estudadas atendem Ãs exigÃncias da NBR 13207, exceto a condiÃÃo com incorporaÃÃo de 50% de PCC. Em geral, as propriedades mecÃnicas se comportaram de forma semelhante entre as condiÃÃes com 10 e 20% de PCC, sendo que a evoluÃÃo de 20 para 30% gerou queda significativa nos resultados de resistÃncia mecÃnica. Com isso, conclui-se que a condiÃÃo de 20% de PCC em gesso e relaÃÃo a/g de 0,2 atende à norma, permite o reaproveitamento de resÃduos e, graÃas ao processo de prensagem, apresenta melhor resistÃncia mecÃnica comparada aos produtos usuais.
York, Christopher D. "Combustion properties of density separated inertinite macerals in the Herrin #6 and Murphysboro coal seams /". Available to subscribers only, 2009. http://proquest.umi.com/pqdweb?did=1796420411&sid=1&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Texto completoYork, Christopher Daniel. "Combustion properties of density separated inertinite macerals in the Herrin #6 and Murphysboro coal seams". OpenSIUC, 2009. https://opensiuc.lib.siu.edu/theses/473.
Texto completoMcGrath, Hollis Joyce. "Developmental changes in chemical and physical properties of Coal Valley minesoils in the central Alberta foothills". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ64970.pdf.
Texto completoMares, Tennille Elisa. "An investigation of the relationship between coal and gas properties in the Huntly coalfield, New Zealand". Thesis, University of Canterbury. Geological Sciences, 2009. http://hdl.handle.net/10092/4453.
Texto completoJankus, Daniel James. "Antimicrobial Properties of Graphite and Coal-Derived Graphene Oxides as an Advanced Coating for Titanium Implants". Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103151.
Texto completoMaster of Science
Any time a patient receives implantation surgery, there is a chance of microbes entering the body. These are typically naturally occurring skin flora, harmless but opportunistic. On the surface of implants within the body, these bacteria can form colonies called biofilms, leading to severe and potentially deadly infections, called prosthetic joint infection (PJI). PJI often requires multiple surgeries to remedy, but rates of reinfection are relatively high. As with any surgery, patients are given antibiotic drugs, but implants to not receive blood flow as the body normally would, reducing the effectiveness of antibiotics. Once biofilms are formed, the bacteria become even hardier and resistant even to powerful antibiotics. Graphene oxide (GO) is a carbon material known to have good biocompatibility (i.e., non-toxic) while providing antimicrobial properties. The focus of this study is on the development and characterization of a robust coating for titanium alloy implants to promote bone healing while reducing microbial biofilm colonization on the implant's surface. The novelty of this study is the use of proprietary coal-derived graphene oxide (c-GO) in a biomedical application. c-GO has been demonstrated to have a different chemical makeup than graphite-derived GO, which may improve its efficacy as an antimicrobial coating. As an alternative to powerful antimicrobial drugs, it was hypothesized that a coating of graphene-oxide would provide a defensive, passively antimicrobial layer to a titanium implant. While GO is typically quite expensive, the newly developed one-pot process provides an economical and environmentally friendly method of producing GO from coal (c-GO). The result is a coating that is inexpensive and capable of halving the biofilm formation of MRSA on titanium-alloy surgical screws in addition to providing improved bone cell adhesion and hard tissue compatibility.
Jansen, van Vuuren Melchior Changuion. "The chemical properties and derived sedimentation patterns of the coal seams in the Witbank-Highveld area". Diss., University of Pretoria, 1989. http://hdl.handle.net/2263/61056.
Texto completoVan beskikbare inligting asook data van steenkoolprodukte is n studiegebied in die Witbank- en Hoeveldsteenkoolvelde uitgesoek. Die petrografiese en elementsamestellings- eienskappe van die steenkoollae is afgelei uit die verband tussen droe as-vry vlugstof en hittewaarde (Snyman et al, 1983; Barnard, 1987). Hierdie afgeleide waardes is aangevul met assamestellingsanalises van steenkoolprodukte, paleotopografiese data en lac:tgdiktes. Uit hierdie data is inligting oor die toestande wat tydens veenvorming en afsetting geheers het, ingewin. Gerekenariseerde ondergrondse karteringstegnieke is gebruik om verskeie chemiese en petrografiese eienskappe aan te dui. Die bestaan van hoofkanaalkomplekse wat na die suide uitspoelstrome tot gevolg gehad het, word veronderstel. hierdie hoofkanale tot Gedurende die vorming van die onderste lae was 6 km breed en het die roetes met n matige gradient oor die algemeen van oos na wes en van noord na suid gestrek. Die kanale volg topografiese laagtes en om topografiese hoogtes. Die plant-gestabiliseerde kanale het geaggradeer teen n tempo wat met veenvorming tred gehou het. Die voedingsbron van die kanale was smeltwaters afkomstig van die ·noordwaarts terugbewegende gletserbedekking. Lae-energie steenkoollae strome tot het n gevolg wye laterale gehad. Die verspreiding van kanale het die autochtone vervoer en herafsetting van inertodetrinitiese materiaal van hipautochtoniese oorsprong te weeg gebring. Die steenkoollae wat met die kanaalareas geassosieer is, is oor die algemeen dunner en hierdie steenkool is gewoonlik inertiniet-ryk. Die steenkool is ook bros en is geneig om suidwaarts skalierig te word. n Goeie verband tussen die mineraaleienskappe en steenkooltipe van die No. 2 Steenkoollaag is vasgestel. Die inertiniet-ryke steenkool wat in die hoofkanaalgebiede voorkom bevat mineraalbestanddele wat ryker is aan suur minerale. Hierdie minerale is kwarts, normatiewe rutiel en kaoliniet. Steenkool wat in tussen-kanaalareas en moerasse ontstaan het, het oor die algemeen n hoer vitriniet-inhoud. Die mineraalbestanddele van hierdie steenkool bevat relatief meer piriet, karbonaatminerale en illiet. Hierdie verwantskap tussen mineraalbestanddele en steenkooltipe is aanduidend van verskillende paleo-omgewingstoestande waarin die veen gevorm het. Vitriniet-ryke steenkool het ontstaan uit veen wat aan brakwatertoestande redokspotensiaal onderwerp geheers het. was waar matige Inertiniet-ryke hoe pH en n steenkool word veenvorming in suur waters onder oksiderende toestande geassosieer. laer met Rivierkanale het n beheer op laagverspreiding en die petrografiese profiel wat kenmerkend van steenkoollae is, uitgeoefen. Die meeste van die vitriniet-ryke steenkoollae het n kenmerkende patroon: n vitriniet-ryke basis wat opwaarts gradeer na inertinitiese steenkool. Hierdie petrografiese profiel mag herhaal word in n steenkoollaag en is meesal omgekeer in steenkoollae wat in kanaalareas afgesit is waar n vitriniet-ryke bocnste gedeelte van die laag afwaarts gradeer na n inertiniet-ryke basis. Die invloed van die topografie van die voor-Karoo vloer is deurgaans in die opeenvolging van die hoofafsettingseenhede waarneembaar, veral in die Witbank-steenkoolveld. Nietemin het die paleo-omgewings wat tydens die vorming van die verskeie steenkoollae geheers het, van mekaar verskil. Die verskillende lae het elk sy eie oppervlakteverspreiding, laaggeometrie en petrografiese en chemiese eienskappe.
Dissertation (MSc)--University of Pretoria, 1989.
Geology
MSc
Unrestricted
Oldham, R. H. "The influence of water on long-term strength properties of coal measures rocks associated with mining excavations". Thesis, University of Nottingham, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355420.
Texto completoShurtz, Randy C. "Effects of Pressure on the Properties of Coal Char Under Gasification Conditions at High Initial Heating Rates". BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2877.
Texto completoHarris, Dean Michael. "Geotechnical properties of coal and mine pillar design in the Greymouth and Reefton coalfields, West Coast, South Island". Thesis, University of Canterbury. Engineering Geology, 2002. http://hdl.handle.net/10092/9274.
Texto completoDu, Preez Susanna Maria. "Influence of minerals on the moisture adsorption and desorption properties of South African fine coal / du Preez S.M". Thesis, North-West University, 2012. http://hdl.handle.net/10394/8157.
Texto completoThesis (MIng (Chemical Engineering))--North-West University, Potchefstroom Campus, 2012.
Weniger, Susan Verfasser], Rudy [Akademischer Betreuer] Swennen y Ralf [Akademischer Betreuer] [Littke. "Coal reservoir characteristics and fluid transport properties for coalbed methane (CBM) evaluation / Susan Weniger ; Rudy Swennen, Ralf Littke". Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1162499699/34.
Texto completoWeniger, Susan [Verfasser], Rudy Akademischer Betreuer] Swennen y Ralf [Akademischer Betreuer] [Littke. "Coal reservoir characteristics and fluid transport properties for coalbed methane (CBM) evaluation / Susan Weniger ; Rudy Swennen, Ralf Littke". Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1162499699/34.
Texto completoEl-Qada, Emad Nihad Ahmad. "Characterisation and adsorption properties of activated carbons produced from bituminous coal for the removal of dyes from aqueous solution". Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426794.
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