Дисертації з теми "Mine residues"
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Peralta, Genandrialine Laquian. "Characterization, leachability and acid mine drainage potential of geothermal solid residues." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ28036.pdf.
Повний текст джерелаMariga, Valentina. "Sustainability analysis in the mining sector: a case study on new recycling technologies for sulphidic mine residues valorisation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23270/.
Повний текст джерелаAnderson, Jonathan D. "Impacts of amending bauxite residue sands with residue fines for the establishment of vegetation on residue disposal areas /." Murdoch University Digital Theses Program, 2009. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20090831.155453.
Повний текст джерелаAckah, Louis A. "SYNERGISTIC APPLICATION OF A MUNICIPAL WASTE MATERIAL AND PHYTOREMEDIATION TECHNIQUE FOR REMEDIATING ACID MINE DRAINAGE AND IMPACTED SOIL." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/dissertations/1568.
Повний текст джерелаHendricks, Nicolette Rebecca. "The application of high capacity ion exchange adsorbent material, synthesized from fly ash and acid mine drainage, for the removal of heavy and trace metal from secondary Co-disposal process waters." Thesis, University of the Western Cape, 2005. http://hdl.handle.net/11394/1455.
Повний текст джерелаMagister Scientiae - MSc
Benaiges-Fernandez, Robert. "Bioreduction of iron (hydr)oxides from mine tailings under marine conditions." Doctoral thesis, Universitat de Barcelona, 2021. http://hdl.handle.net/10803/673411.
Повний текст джерелаLa indústria minera s’encara a un problema de gestió dels residus produïts. Degut als problemes mediambientals que provoca l’emmagatzematge terrestre de les cues mineres, la deposició submarina de les cues (STD) és una opció que ha guanyat interès en els darrers anys. Aquesta pràctica implica el dipòsit dels residus al fons marí mitjançant canonades submergides des de les indústries mineres. Aquestes cues es poden veure afectades geoquímicament per les poblacions microbianes que viuen en el fons marí i que poden tenir una ecofisiologia compatible amb els residus. Aquestes comunitats (per exemple, Shewanella, Geobacter) poden bioreduir el ferro fèrric dels òxids i/o hidròxids continguts en els residus miners, alliberant Fe (II) i elements traça (TE) al medi marí. El principal objectiu d’aquest treball va ser entendre el procés de bioreducció dels òxids i hidròxids de ferro presents en els residus miners i avaluar les conseqüències mediambientals dels dipòsits de residus al fons marí. Per dur a terme aquest propòsit, es van fer experiments de tipus batch i de columna amb diverses mostres d’òxids i hidròxids de ferro i de residus miners, les quals van reaccionar amb Shewanella loihica, un bacteri desassimilatori del ferro capaç de dur a terme la dissolució reductiva del ferro. Es va monitoritzar l’alliberament de Fe(II) i de TEs, es van observar les superfícies dels sòlids reaccionats i es va fer un model geoquímic per quantificar la bioreducció. A més a més, per tal d’entendre millor la influència del ferro en el cicle del nitrogen de l’oceà es van dur a terme uns experiments batch on el ferro bioreduït interaccionava amb nitrit. Els resultats han demostrat que la Shewanella loihica pot bioreduir els òxids i/o hidròxids de ferro continguts en residus miners en condicions semblants a les del fons marí. Aquesta dissolució bioreductiva comporta l’alliberament de Fe(II) i de TEs que poden arribar a ser perjudicials per l’ambient. S’ha deduït que la superfície reactiva dels òxids i/o hidròxids é un factor clau en la bioreducció perquè proveeix Fe(III) per bioreduir i superfície perquè els bacteris transfereixin electrons.. Ara bé, l’adsorció de Fe(II) en la superfície comporta, per una banda, la disminució de la superfície reactiva i del Fe(III) disponible i, per altra banda, la formació d’una nova fase mineral biogènica que conté Fe2+/Fe3+, és a dir una transformació a magnetita També s’ha demostrat que el Fe(II) alliberat per la bioreducció pot interferir, amb el cicles biogeoquímic del nitrogen de l’oceà. Així, el Fe(II) bioproduït desencadena l’eliminació del nitrit en el mar. Aquest procés s’ha caracteritzat utilitzant anàlisis químiques i isotòpiques. Les dades isotòpiques han servit per entendre millor els mecanismes que regulen la interacció Fe(II)-nitrogen, i per identificar l’origen de la reducció de nitrit en el medi marí. A partir dels resultats obtinguts, es dedueix que el dipòsit de residus miners al mar (STD) és un problema mediambiental perquè (1) l’alliberament de Fe(II) pot provocar una fertilització i eutrofització dels llocs on es dipositin els residus amb una disminució de l’oxigen dissolt i una expansió de la zona mínima d’oxigen i (2) l’alliberament d’ETs pot provocar una bioacumulació d’aquests elements a les xarxes tròfiques. Tot plegat afecta no només l’equilibri d’altres cicles biogeoquímics a l’oceà sinó també la salut humana i l’economia de la societat.
Adler, Matthew. "Evaluation Of Water Treatment Residuals and Vetiver Grass for Treating Acid Mine Drainage." OpenSIUC, 2014. https://opensiuc.lib.siu.edu/theses/1670.
Повний текст джерелаMontesinos, León Mayra Inés. "Caracterización de efluentes de mina para elección de la alternativa óptima de tratamiento." Bachelor's thesis, Pontificia Universidad Católica del Perú, 2017. http://tesis.pucp.edu.pe/repositorio/handle/123456789/7885.
Повний текст джерелаTesis
Morokane, Tebogo Molefe Shadrack. "The impact of gold and coal mine residue on water resources in the Roodepoort and Newcastle areas." Diss., University of Pretoria, 2011. http://hdl.handle.net/2263/30818.
Повний текст джерелаDissertation (MSc)--University of Pretoria, 2011.
Chemical Engineering
Unrestricted
Kopittke, Peter Martin. "Limitations to plant root growth in highly saline and alkaline bauxite residue /." [St. Lucia, Qld.], 2004. http://adt.library.uq.edu.au/public/adt-QU20040913.094109/index.html.
Повний текст джерелаGherardi, Mark James. "Availability and management of manganese and water in bauxite residue revegetation." University of Western Australia. Soil Science and Plant Nutrition Discipline Group, 2004. http://theses.library.uwa.edu.au/adt-WU2005.0038.
Повний текст джерелаVicente, Annalisa Sarga. "Assessing different coal combustion residue backfill scenarios in opencast coal mines, Mpumalanga, South Africa." University of Western Cape, 2020. http://hdl.handle.net/11394/7853.
Повний текст джерелаCoal-fired power stations produce large volumes of coal combustion residues (CCRs), which are disposed of in hold ponds or landfill sites. These ash storage facilities are limited in space and are approaching the end of their capacities, thus additional land is required for extensions. If new land is not sourced, power plants will be forced to cease operations, resulting in increased expenditure costs and environmental liability. A proposed disposal solution is to backfill opencast coal mines with CCR monoliths. However, there is limited knowledge on the hydraulic behaviour of CCRs in an opencast coal mine environment. This leads to an inability to assess this applications feasibility and determine whether this activity will have a positive, negligible or negative effect on groundwater quality. This study aims to address this gap in knowledge by assessing the flow and transport properties of CCRs under numerous theoretical backfilling conditions.
Singh, Manoj Kumar. "Residual life estimation of steel wire ropes used for hoisting in Indian mines." Thesis, University of Reading, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494411.
Повний текст джерелаSmedley, Kristi Olson. "Effect of application of fluidized bed combustion residue to reclaimed mine pastures on forage yield, composition, animal performance and mineral status." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/49810.
Повний текст джерелаCraig, Zelieann Rivera. "Characterization of Residual Ovarian Tissue in Mice following 4-vinylcyclohexene Diepoxide-induced Ovarian Failure." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/195567.
Повний текст джерелаFernández, Pérez Begoña. "Desarrollo de un nuevo método para la eliminación de cianuro de aguas residuales de mina." Doctoral thesis, Universidad de Oviedo, 2007. http://hdl.handle.net/10803/31849.
Повний текст джерелаSantos, Erika da Silva. "Potencialidade de correctivos orgânicos/inorgânicos na recuperação de escombreiras, de gossan e ricas em sulfuretos e desenvolvimento de Cistus ladanifer e Lavandula pedunculata para a exploração de bioextractos vegetais." Doctoral thesis, ISA-UL, 2016. http://hdl.handle.net/10400.5/12045.
Повний текст джерелаNeste trabalho estudou-se a potencial reabilitação de dois tipos de escombreiras, rica em sulfuretos e gossan, da mina de São Domingos usando resíduos orgânicos/inorgânicos e espécies vegetais com valor económico, Cistus ladanifer (esteva) e Lavandula pedunculata (rosmaninho). Avaliou-se o comportamento ecofisiológico das espécies em condições naturais e a qualidade de alguns produtos derivados das mesmas (chá/infusão de rosmaninho e bioextractos de ambas as espécies) face às características dos substratos onde estas crescem espontaneamente. Em condições controladas, avaliou-se a eficiência de Tecnossolos, elaborados com resíduos orgânicos/inorgânicos e de escombreiras, na melhoria da qualidade química dos lixiviados (percolação e simulados), para minimizar a dispersão dos contaminantes, e melhorar as características químicas e biológicas dos materiais para desenvolvimento de vegetação. Independentemente das características dos solos, ambas as espécies crescem sem sinais de toxicidade ou deficiência nutricional apresentando características ecofisiológicas adequadas para fitoestabilização. Nas duas espécies, o primeiro mecanismo de tolerância aos elementos potencialmente tóxicos (EPTs) do solo é a sua acumulação na raiz e baixa translocação para locais fotossinteticamente activos. As concentrações fitotóxicas de alguns elementos na parte aérea do rosmaninho não afectaram a concentração de pigmentos e proteínas nem desencadearam mecanismos de tolerância, enzimáticos e não enzimáticos, relacionados com stresse oxidativo. Os produtos derivados das plantas crescendo na área mineira apresentaram viabilidade económica para diferentes usos pois mantêm a sua qualidade comparada com as de áreas controlo. As escombreiras ricas em sulfuretos lixiviaram soluções extremamente ácidas e com maiores concentrações de EPTs do que as escombreiras de gossan. A metodologia mais sustentável para a reabilitação de ambas as escombreiras da mina de São Domingos foi o desenvolvimento de um sistema que combina o isolamento natural dos materiais ricos em sulfuretos, com uma barreira de resíduos carbonatados, e fitoestabilização com esteva e/ou rosmaninho dos Tecnossolos elaborados com materiais de gossan e resíduos orgânicos/inorgânicos
Villavicencio, Gallardo Rafael William. "Cálculo hidráulico del sistema de relaves – caso Mina Invicta." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2019. https://hdl.handle.net/20.500.12672/16581.
Повний текст джерелаGreco, Valerie S. "Functional analysis of the role of conserved glycine residues and N-terminus motifs in the cell division inhibitor MinC from Neisseria gonorrhoeae." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26647.
Повний текст джерелаPonte, Henrique Caetano Fernandes Correia da. "Avaliação da toxicidade de águas residuais e sedimentos provenientes da Mina de Urânio da Cunha-Baixa." Master's thesis, Universidade de Aveiro, 2003. http://hdl.handle.net/10773/19060.
Повний текст джерелаA contaminação de ecossistemas naturais, resultante da actividade do Homem, é um problema que assume cada vez maior relevância ecológica. Em particular a indústria mineira, envolve profundas modificações (e.g., paisagísticas, químicas, biológicas) que podem provocar grandes impactos ambientais. Assim, a exploração mineira pode provocar a acumulação de metais pesados na coluna de água e nos sedimentos associados ao jazigo mineral, que são susceptíveis de determinar graves consequências ambientais. Na Mina da Cunha Baixa desenvolveu-se, até cerca de 1993, a exploração de minérios radioactivos, nomeadamente de urânio. À presença de material radioactivo (cerca de 1 milhão de tonelads de material, com níveis médios de 300 ppm de U, associado a 226Ra), associam-se metais, nomeadamente, zinco, alumínio, berílio. Com este estudo pretendeu-se avaliar a toxicidade de águas e sedimentos de uma mina de urânio com duas espécies de cladóceros (Daphnia magna e Daphnia longispina), através de ensaios agudos e crónicos e, também, com a bactéria Vibrio fischeri. Dos resultados obtidos, a espécie mais sensível nos ensaios de imobilização, foi D. longispina, quer para águas, quer para o sedimento, sendo D. magna a menos sensível. O tratamento da água, realizado no local, indicia bons resultados no referente a toxicidade da coluna de água já que é mínima, ou praticamente inexistente, em ensaios de imobilização e crónicos. Deste modo, a água que circula pelos campos agrícolas limítrofes à mina pode ser classificada como de boa qualidade para rega, visto os parâmetros observados estarem dentro dos limites propostos pela legislação. Para uma melhor avaliação toxicológica seria necessário realizar mais ensaios ao longo do ano hidrológico, pelo menos um ensaio por estação do ano. A fim de se caracterizar potenciais efeitos ou riscos ecológicos em populações naturais devem ser efectuados estudos relativamente à alteração da estrutura da comunidade, associada à realização de bioensaios com diferentes metais, para determinação de potenciais efeitos agudos e crónicos em organismos aquáticos.
The contamination of natural ecosystems resulting from Human activity is a problem with increasing ecological relevance. The mining activity, in particular, involves serious changes (e.g., landscape, chemical, biological) that may cause serious environmental impacts. Thus, the mining activity may cause the accumulation of heavy metals in the water column and in the sediments associated with the mineral beds, which are susceptible to determine serious environmental consequences. In the Cunha Baixa mine, until 1993, was performed the extraction of radioactive ore, such as uranium. Not only radioactive material was detected (about 1 million tons of material, with average levels of 300 ppm of U, associated with 226Ra), but also metals such as zinc, aluminium, and beryllium were determined. The aim of this study was to assess the toxicity of water and sediment of Cunha Baixa mine using two cladoceran species (Daphnia magna and Daphnia longispina), through acute and chronic tests and, also, using the bacteria Vibrio fischeri. According to the obtained results, the most sensitive species was D. longispina for both water and sediments immobilization assays, being D. magna the less sensitive. The treatment of water performed in situ, shows good results concerning the water column toxicity, as it was minimal, or practically inexistent in immobilization and chronic assays. Therefore, the water that circulates through the limitrophe agricultural fields to the mine can be classified as of good quality for irrigation, once the observed parameters are within the legislated limit values. For a better toxicological evaluation it would be necessary to perform more assays during the hydrological year, at least one assay per season. In order to characterize potential effects or ecological risks in natural populations, further studies should be performed concerning the change in the community structure, associated with bioassays with different metals to determine the potential acute and chronic effects in aquatic organisms.
Wang, Yibing. "Study of cysteines in the stalk region of CD3 proteins : evolutionarily conserved residues critical for T cell development and function /." Connect to full text via ProQuest. Limited to UCD Anschutz Medical Campus, 2008.
Знайти повний текст джерелаTypescript. Includes bibliographical references (leaves 138-153). Free to UCD Anschutz Medical Campus. Online version available via ProQuest Digital Dissertations;
Mena, Ayala Alejandro. "Tratamiento de aguas residuales industriales, mediante el sistema de pasivos artificiales (wetland), en la mina San Genaro." Master's thesis, Universidad Nacional Mayor de San Marcos, 2017. https://hdl.handle.net/20.500.12672/7662.
Повний текст джерелаDetermina en qué medida la aplicación del tratamiento de aguas residuales industriales mediante el sistema de pasivos artificiales (wetland), y su posterior recirculación, disminuirá significativamente el nivel de contaminación ambiental generado por las aguas acidas y metales pesados en la mina San Genaro y la comunidad campesina de Santa Ana, ubicadas en Huancavelica, Perú. Determina en qué medida la aplicación del tratamiento de aguas residuales industriales mediante pozas de decantación y sistema tipo wetland y su posterior recirculación, disminuirá significativamente el nivel de contaminación ambiental, generado por metales pesados y otros componentes, de modo que cumplan con los parámetros ambientales establecidos por las leyes peruanas. Determina si la aplicación del tratamiento de aguas residuales industriales mediante pozas de oxidación y sistema tipo wetland, y su posterior recirculación será mucho más económico que un sistema de tratamiento tradicional.
Tesis
Arranz, Piera Pol. "Prospects of distributed electricity generation and services based on small scale biomass systems in Ghana." Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/664278.
Повний текст джерелаL'accés a l'energia és crucial per al benestar humà, no es pot concebre cap activitat residencial, comercial o industrial sense subministrament d'energia. Alhora, la dependència actual dels combustibles fòssils i els seus efectes negatius sobre el clima global reclamen alternatives urgents. La situació a l'Àfrica Subsahariana és punyent: més de la meitat de la població, principalment rural, viu sense accés a serveis elèctrics. Tanmateix, en aquestes zones abunden les restes agrícoles. Tot i que la tecnologia per a la producció d'electricitat a partir de biomassa agrícola avança, la promoció de l’electrificació rural descentralitzada continua sent un repte, especialment en països en desenvolupament com Ghana, atesa la varietat i la complexitat de factors que condicionen l’aprofitament energètic de la biomassa. Aquesta complexitat s'ha tractat en exercicis acadèmics, però amb poca aplicabilitat pràctica per a planificadors d'energia, promotors i inversors. A fi de contribuir a una millor planificació i presa de decisions, aquesta Tesi desplega un marc integral d’anàlisi tenint en compte quatre components (desenvolupament social, organitzatiu/institucional, tècnic, i financer), flexible per adaptar-se a diferents configuracions de subministrament d'energia i escenaris reguladors. Aquest marc s'ha aplicat a tres casos reals a Ghana, recollint dades de camp, modelitzant la viabilitat tecno-econòmica i debatent els resultats amb promotors públics i privats. La primera configuració consisteix en la generació elèctrica a partir de restes agrícoles de petites plantacions rurals, en 14 districtes a Ghana, on s?ha determinat la biomassa disponible i la seva localització per calcular les distàncies màximes que permetrien la rendibilitat de petites centrals elèctriques. Els resultats indiquen que un mínim de 22 a 54 plantacions (de 10 ha. cadascuna) haurien d'agrupar-se per permetre un subministrament de biomassa econòmicament viable a una planta de 1000 kWe. Financerament aquesta inversió no seria viable amb les tarifes actuals d’injecció a xarxa; un increment d’aquesta tarifa en un 25%, o bé una subvenció mínima del 30% del cost d'inversió són necessàries per garantir la viabilitat. La segona configuració se centra en la co- i la tri-generació a partir de restes agrícoles. Els resultats de l’anàlisi tècnic-econòmica mostren que centrals de 600 kW i 1 MW per autogenerar electricitat, calor (per assecar mandioca o de blat de moro) i fred (per refrigerar tomàquets) són factibles, fins i tot aportant un retorn anual mínim del 20% per a inversors externs. A més de l’electricitat, en cas de poder vendre com a mínim un 60% de la calor produïda, es podria pagar entre 29 i 64 USD per tona de biomassa. La consideració de bons de carboni a preus habituals de mercat internacional té poc impacte en els resultats del projecte; si es consideren esquemes més favorables (com els bons de carboni a Suècia), la viabilitat de les plantes de co-i tri-generació a partir de restes agrícoles seria possible fins i tot amb un baix nivell de vendes de calor residual. La tercera configuració tracta el servei elèctric amb microxarxes basades en la gasificació de restes agrícoles de comunitats rurals. Els resultats de l’anàlisi en 5 comunitats mostren que el potencial de generació elèctrica a partir de la biomassa disponible supera la demanda elèctrica projectada. El finançament només a partir d’aportacions privades no seria viable amb les tarifes nacionals de consum elèctric actuals; en canvi, si s’aplica una tarifa de consum igual a la despesa actual en usos equivalents a l’electricitat (p.ex. llanternes i piles, bateries de cotxe), una subvenció del 35% sobre la inversió inicial permetria una taxa interna de retorn del 15% a inversors privats, mentre que un 60% la subvenció permetria una taxa interna de retorn del 25%.Els resultats d'aquesta investigació han estat considerats pels grups d'interès de Ghana dins de la formulació de polítiques i regulacions d'electrificació rural, i perspectives de trigeneració i els minigresos de biomassa també han desencadenat l'interès dels inversors privats internacionals i ghanesos
Geremias, Reginaldo. "Utilização de rejeito de mineração de carvão como adsorvente para redução da acidez e remoção de íons de metais em drenagem ácida de mina de carvão." Florianópolis, SC, 2008. http://repositorio.ufsc.br/xmlui/handle/123456789/91093.
Повний текст джерелаMade available in DSpace on 2012-10-23T18:42:53Z (GMT). No. of bitstreams: 1 262183.pdf: 1032150 bytes, checksum: b94cf24dff55b25b9e71f804fc947bb1 (MD5)
O presente trabalho objetivou utilizar rejeito de mineração de carvão calcinado como adsorvente para redução da acidez e remoção de íons de metais em drenagem ácida de mina de carvão. O processo de remediação da drenagem ácida foi avaliado, utilizando-se ensaios de toxicidade em organismos bioindicadores. Os resultados de caracterização do adsorvente indicaram a predominância de mesoporos e presença dos óxidos majoritários SiO2, Al2O3 e Fe2O3. A remediação da drenagem ácida com o adsorvente por processo estático foi capaz de provocar a elevação do pH e promover expressiva remoção dos íons de metais em solução. Nos estudos de adsorção de íons, constatou-se que o modelo de pseudo segunda-ordem foi o que melhor correlacionou os dados cinéticos experimentais, sendo que a isoterma de Langmuir forneceu o melhor ajuste dos dados experimentais de equilíbrio. A drenagem ácida não remediada apresentou expressiva toxicidade aguda sobre Daphnia magna e Artemia sp, bem como, elevada toxicidade subaguda em Allium cepa L, sendo que após a remediação com o adsorvente, não foi observada toxicidade para estes organismos. A remediação também promoveu a redução de dano oxidativo sobre lipídeos, proteínas e DNA em Allium cepa L. A partir dos resultados obtidos, sugeriou-se a utilização do adsorvente como alternativa para o tratamento destas fontes de contaminação ambiental.
Fernandez, Frias Rony Miler. "Propuesta de generación de electricidad a partir de pulpa de café para el proceso de despulpado en la Asociación Sierra Norte Mina." Bachelor's thesis, Universidad Católica Santo Toribio de Mogrovejo, 2019. http://hdl.handle.net/20.500.12423/2639.
Повний текст джерелаTesis
Lopes, Tito Souza Filippo. "Análise da aplicabilidade de sistema mini-VANT comercial no diagnóstico da geração de resíduos de desastres no Brasil." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/6/6139/tde-20082018-141639/.
Повний текст джерелаThe need to minimize the impacts caused by disasters, and the solid waste generated, motivated the development of methods and practices for the management of disaster residues all over the world. Orbital remote sensing platforms and manned aircraft have been used in the management of disasters and their residues, even though it restricts them to the most extreme cases. The technological development of unmanned aerial vehicles (UAVs), especially low-cost commercial civil models, and the formulation of legislation that deals with their use, has made their application viable in different areas, including precision mapping. In order to analyze the applicability of these platforms in aid of the diagnosis of disaster waste generation, two sets of photographs previously obtained with an \"off the shelf\" UAV were selected. Then, the processing of these data in PhotoScan was carried out, aiming at the generation of informative maps. It was sought to analyze the capacity of identification, quantification and characterization of the solid residues disposed in the mapped areas. Legal, economic and technical aspects associated to the use of the tool were contemplated, in order to better base the applicability on the question. The results indicated relevant potential of identification and quantification of the residues found, and some limitations in their capacity of characterization. The current legislation, and the economic and technical aspects raised favor the use of commercial mini-VANT for the proposed use, even though in a limited way to disasters where the affected extension is not too extensive. The observance of good practices in the choice of equipment, in the planning and execution of its execution are fundamental for the generation of informative maps containing the positioning, the estimated volume and the estimated composition of the amounts of residues found.
Large, Rebecca. ""The mind is an absolute ******" : adjustment to residual disability following an Acceptance and Commitment Therapy (ACT) group for stroke survivors." Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/105041/.
Повний текст джерелаSouza, Filipi Marques de. "Estudo da descontinuidade geom?trica em l?mina de tecido h?brido bidirecional vidro/carbono." PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA MEC?NICA, 2017. https://repositorio.ufrn.br/jspui/handle/123456789/23690.
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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)
Os crescentes desenvolvimentos tecnol?gicos e econ?micos convergem para a necessidade de cria??o de materiais cada vez mais eficientes, os quais buscam unir alto desempenho e baixo custo. Os comp?sitos surgem como solu??o para substitui??o de materiais convencionais, por serem desenvolvidos para aplica??es especificas, podendo apresentar caracter?sticas desejadas. Os tecidos h?bridos aplicados em comp?sitos fibrosos, se projetados adequadamente, possibilitam uma melhoria ainda maior no rendimento, j? que, diferentemente dos tecidos convencionais, os tecidos h?bridos combinam fibras diferentes com alinhamento dependente do tipo de solicita??o de carga, podendo obter um material mais eficiente. Neste trabalho, foram realizadas an?lises com o intuito de estudar o comportamento de uma l?mina de comp?sito refor?ado por tecido h?brido bidirecional vidro/carbono em presen?a de descontinuidades geom?tricas. Para a realiza??o desse estudo o comp?sito foi fabricado a partir do processo de moldagem manual (hand-lay up). A partir dos ensaios realizados, de acordo com as normas da ASTM, obtiveram-se as caracter?sticas e propriedades do material (Percentual m?ssico e volum?trico de fibras, gr?ficos de tens?o x deforma??o, resist?ncia ?ltima e m?dulo de elasticidade). Foram analisadas configura??es com as fibras alinhadas nas dire??es principais (0? e 90?) e em ?ngulo (30?, 45? e 60?). A l?mina obteve um percentual m?ssico total de fibras de 38,98%, sendo 19,49% de fibra de vidro e 19,49% de fibra de carbono. J? para o percentual volum?trico obtiveram-se os seguintes resultados: 10,91% de fibra de vidro e 14,88% de fibra de carbono. A partir dos resultados obtidos nos ensaios de tra??o p?de-se observar que os materiais com fibras em ?ngulo apresentam resist?ncia inferior aos com alinhamento na dire??o principal e ao mesmo tempo apresentaram maiores alongamentos. A resist?ncia residual apresentou resultados semelhantes tendo valores em torno de 0,774, exceto para o material com angula??o de 30?, o qual apresentou um valor de 0,676. Diante dos resultados encontrados, torna-se evidente que a descontinuidade geom?trica ? um fator relevante na resist?ncia deste comp?sito e deve ser considerada.
The technological and economic development growing converge to the necessity of create increasingly efficient materials, which seek to combine high performance and low cost. The composites appear as solution to substitute conventional materials, because they are developed for specific applications and may have desired characteristics. Hybrid fabrics applied to fibrous composites, if adequately designed, allow an even greater improvement in efficiency, since, unlike conventional fabrics, these combine different fibers with different load-dependent alignment and can obtain a more efficient material. In this work, analyzes were carried out with the aim of studying the behavior of a composite lamina reinforced by bi - directional (glass/carbon) hybrid fabric in presence of geometric discontinuities. In order to carry out this study, the composite material was fabricated from the manual molding process (hand-lay up). From the tests performed, according to ASTM standards, the characteristics and properties of the material were obtained (mass and volume percentages of fibers, stressstrain curve, ultimate strength and modulus of elasticity). Configurations were made with fibers aligned in the main directions (0? and 90?) and at angles (30?, 45? and 60?). The composite lamina had a total mass percentage of fibers of 38.98%, being 19.49% of glass fiber and 19.49% of carbon fiber. For the volumetric percentage, the following results were obtained: 10.91% of glass fiber and 14.88% of carbon fiber. From the results obtained in the stress tests it was noted that the materials with angled fibers have lower resistance than those with alignment in the main direction and at the same time they presented greater stretches. The residual strength presented similar results having values around 0.774, except for the material with 30? angulations', which presented a value of 0.676. Considering the found results, it is evident that the geometric discontinuity is a relevant factor in the strength of this composite and should be considered.
Rungruangkonkit, Sangjan. "Understanding the lived experiences of depressed Mien refugees who have resided in the United States for ten or more years /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/7237.
Повний текст джерелаCOUTO, Pâmela Talita do. "Métodos numéricos e estatísticos aplicados à modelagem de um reator em batelada anaeróbio, no tratamento da drenagem ácida de mina." Universidade Federal de Alfenas, 2016. https://bdtd.unifal-mg.edu.br:8443/handle/tede/870.
Повний текст джерелаThe acid mine drainage (AMD) is one of the most serious environmental problems in mining industry, because it affects the quality of groundwater and surface water, soil and, consequently, human health. This wastewater is formed by the oxidation of sulphide minerals when exposed to weathering, such as water and oxygen, thus causing acid that with the rain is loaded leaching the elements present in the area. This wastewater is characterized by its low concentration of organic material and low pH, high conductivity, high concentrations of sulphate and heavy metals. Conventionally in industry, the AMD is treated by the process of neutralization using calcium oxides, but an alternative to this process is the anaerobic treatment of the AMD in anaerobic reactors containing sulfate reducing bacteria (SRB), which reduce sulfate to sulfide consuming ions (H+), consequently there is an increased of the pH effluent and this sulfide reacts with the metals present in solution, precipitating in the form of metal sulfides. However, in addition to know how to proceed the treatment of wastewater in anaerobic reactors it is important to realize the modeling of data to understand in detail all the process, since the model allows us to clearly see the influence of one variable on the others. So, the main objective of this study was to model the experimental data from anaerobic treatment of the AMD in a batch reactor in bench scale, previously operated. It was proposed the model of Malthus-Monod-Fick to determine which groups of microorganisms were active in the system and also to evaluate whether there was any effect of internal mass transfer in the granule over the overall order of the reaction. And for this specifically, it was explored statistical tools little used in reactor modeling area, such as Maximum Likelihood Method and the Chi-square test of hypothesis, looking for this way to obtain the maximum information through the developed model. The proposed model was implemented in programming language using C ++ with the Root library, used mainly to process large volumes of data and perform statistical analysis, based on the simple premise that evaluates the performance of only one bacterial group working in the system to the most complex premise that takes into account restriction of substrate diffusion inside the granule. It was concluded in this study that more than one bacterial group acted in the system, the SRB and the fermentative bacteria (this group includes all kinds of microorganisms that compete with SRB by electron donor, ethanol), that a long the time the microbial community became more selected because the reactor operating conditions chosed to favor SRB and due to this selection was the growth of a biofilm which acted as a restriction to intern mass transfer. Finally, it has been proven mathematically, with statistical validation model, this mass diffusion restriction over time was responsible for a overall behavior of the first order even using values Monod coefficients small (KS e KA), typical a zero-order kinetics, in which the substrate consumption rate is independent of the concentration of this same substrate.
Fundação de Amparo à Pesquisa do Estado de Minas Gerais - FAPEMIG
Ruyer-Quil, Christian. "Dynamique d'un film mince s'ecoulant le long d'un plan incline." Palaiseau, Ecole polytechnique, 1999. http://www.theses.fr/1999EPXX0046.
Повний текст джерелаBoniolo, Milena Rodrigues [UNESP]. "Remoção de urânio em águas de drenagem ácida de minas por técnicas de biossorção." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/137947.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A escassez qualitativa e quantitativa de água associada aos impactos ambientais impostos por águas residuárias tem agravado o cenário da situação ambiental brasileira. Um setor que merece destaque é o de mineração de urânio visto que o Brasil é a sexta maior reserva mundial deste elemento e existe grande quantidade de rejeitos acumulados contendo íons metálicos, semimetálicos e radiotóxicos. A biossorção tem se mostrado eficiente no tratamento das águas residuárias com íons que mesmo em baixas concentrações são tóxicos. O objetivo deste trabalho foi avaliar a redução da concentração de urânio em soluções e em amostras de águas de drenagem ácida de minas da mina Osamu Utsumi das Indústrias Nucleares do Brasil por meio da biossorção. As biomassas escolhidas para uso como biosorvente foram cascas de banana, sementes de moringa e borra de café. Ensaios de decomposição térmica, porosimetria de adsorção de nitrogênio e microscopia eletrônica de varredura foram efetuados de modo a caracterizar fisicamente os biosorventes. As variáveis analisadas para os ensaios em batelada como tamanho e massa do biosorvente, temperatura do ensaio, tempo de contato, pH e concentração inicial da solução de urânio foram definidas com o planejamento fatorial de experimentos. A partir dos ensaios em batelada realizados, pôde-se observar que as biomassas com maior área superficial e menor volume de poros resultaram em maiores valores de eficiência de remoção, sendo a ordem crescente destes parâmetros: cascas de banana < borra de café < sementes de moringa. Dentre os biosorventes estudados as sementes de moringa apresentaram os maiores valores de eficiência de remoção, seguida pela borra de café e cascas de banana. Em soluções de 100 mg L-1 as eficiências de remoção das sementes de moringa e cascas de banana foram iguais a 0,7429 e 0,2483, respectivamente; em valores de concentração de 25 mg L-1 as borras de café apresentaram eficiência de remoção igual a 0,9358. Em amostras de efluente com concentrações de urânio na ordem de 5 mg L-1 , as sementes de moringa apresentaram-se como o biosorvente com melhor eficiência de remoção (~0,8) quando comparadas as cascas de banana (~0,5) e borra de café (~0,7).
The qualitative and quantitative water scarcity associated with environmental impacts posed by wastewater has worsened the brazilian environmental scenario. Uranium mining is a prominent sector in Brazil context, since this country owns the sixth biggest uranium reserve in the world and there is large amount of accumulated tailings containing metallic, semi-metallic and radiotoxic ions. In general, biosorption has shown significant efficiency on effluent treatment, removing ions which even in low concentrations present toxicity. This work aimed to reduce the concentration of uranium by using biosorption in both cases, lab scale solutions and acid mining drainage effluent samples from Osamu Utsumi mine, wich belongs to Usinas Nucleares do Brasil. The selected biomasses used as biosorvent were banana peels, moringa’s seeds and coffee waste. Thermal decomposition, nitrogen adsorption porosimetry and scanning electron microscopy were performed for physical characterization. The studied variables for the batch tests as size and mass of biosorvent, temperature of tests, contact time, pH and initial concentration of solutions of uranium were defined by using design of experiments. From the tests carried out it was observed that the biomasses with a higher surface area and smaller pore volume resulted in higher removal efficiency values, with an ascending order of these parameters: banana peels
Bertilsson, Olle. "Study of leaching behavior of tin in Zinc-clinker and Mixed Oxide." Thesis, Luleå tekniska universitet, Industriell miljö- och processteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-69941.
Повний текст джерелаGIORDANI, Alessandra. "Avaliação do potencial de comunidades microbianas sulfato redutoras para tratamento de drenagem ácida de mina em reatores sulfetogênicos em escala de bancada." Universidade Federal de Alfenas, 2017. https://bdtd.unifal-mg.edu.br:8443/handle/tede/1035.
Повний текст джерелаAcid Mine Drainage (AMD) is a serious environmental problem in mining industries because of the low pH, high levels of sulfate and dissolved metals present in this wastewater. Biological AMD treatment have been used instead of the traditional method, due to high efficiency obtained in these bioreactors, which promote the sulfate reduction into sulfide by sulfate reducing bacteria (SRB) in the presence of organic matter and anaerobic conditions. An alternative for the biological treatment of AMD consists on the bioremediation using autochthonous SRB that guarantees environmental safety, cost effective and better adaptability. This work studied the potential of autochthonous SRB to sulfate removal in batch anaerobic reactors comparing two inoculum sources. An autochthonous (AUT) biomass, derived from enrichment culture of AMD sediments and, a non-autochthonous (NON-AUT), from a pre-acclimated sludge from a stable sufidogenic reactor adapted with lactate as carbon source, were tested. The sulfate reduction using cost effective electron donors (ethanol and formate) and the acidity resistance of AUT inoculum was also verified. Results showed a maximum sulfate removal of 57% for AUT and 62% for NON-AUT. Phylogenetic study of SRB group using sequencing of dsrB DGGE excised bands revealed the presence of Desulfotomaculum-related bacteria in AUT community, while Desulfovibrio was the predominant genus found in NON-AUT-derived community. When ethanol was used as carbon source, a sulfate reduction of 46% was found and 35% for formate, indicating that at neutral conditions, ethanol is the most viable alternative as carbon source for the enrichment process. At low pH, sulfate reduction still occurred, indicating that these microorganisms were resistants to acidic conditions. However the removal efficiency was reduced when lactate (only 30% on pH close to 3) and ethanol (only 18% on pH close to 5) were used as electron donors. When formate was the carbon source, the sulfate removal efficiency was maintained closely to 38% with pH reduction to 3 and 4, showing that at these conditions, formate is the best carbon source for SRB enrichment. Thus, AUT culture could be used for local AMD decontamination in substitution of pre-acclimated sludge from sulfidogenic reactors.
Programa Institucional de Bolsas de Pós-Graduação - PIB-PÓS
Gu, Guochao. "Caractérisation des propriétés d’emploi des aciers thixoforgés : vers la maîtrise du processus de fabrication." Thesis, Paris, ENSAM, 2013. http://www.theses.fr/2013ENAM0002/document.
Повний текст джерелаThe thixoforging process is an innovative forming process for the manufacturing ofcomplex parts in the semi-solid state, in fewer forming steps and with a decreased formingforce. The objective of this work is to characterize the microstructure of different steel grades ateach step of the thixoforging process in order to better understand the influence of the processparameters and the mechanisms of deformation, as the microstructure of the material in thesemi-solid state, especially the volume fraction of liquid, is very important. Several 2D and 3Dtechniques (SEM-EDS analyses, CSLM, X-ray microtomography) have been used to evaluatethe liquid fraction of various steel grades (M2, C38LTT and 100Cr6). The results for M2 steelshow a good agreement between 2D SEM - EDS observations and 3D X-ray microtomographyafter quenching, which proves that both techniques are efficient in characterizing high-alloyedsteels in the semi-solid state. The CSLM technique is used to observe the microstructuredirectly at high temperature, with the apparition of liquid and the solidification. Thixoforgingexperiments are finally performed in order to study the influence of the process parameters onthe microstructure: the final part geometry, the material flow etc. After analyzing themicrostructure of the thixoforged parts, some mechanisms of material flow are proposed.Moreover, by comparing the results between the thixoforging experiments and the hot forgingsimulations, it is found that the material flow is very different from that of hot forging process,which results from the material behavior. The latter is very sensitive to the process parameters;an accurate process control is necessary
Minek, Joseph. "Some Account of the Art of Photogenic Drawing." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/2994.
Повний текст джерелаPuente, Rodríguez Adán Edmundo. "Optimización del sistema de tratamiento y disposición sanitaria de aguas residuales industriales para vertimiento clase III, provenientes de la boca mina del nivel 250 (EF 03) al río San José." Master's thesis, Universidad Nacional Mayor de San Marcos, 2019. https://hdl.handle.net/20.500.12672/10782.
Повний текст джерелаTesis
Cochran, Michele A. "Effect of land application of fluidized-bed combustion residue on soil and plant characteristics of reclaimed surface-mined pastures, performance and mineral status of grazing steers and nutrient balance by sheep fed the forage." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43389.
Повний текст джерелаAgboka, Kossiga. "Développement d'un modèle thermomécanique axisymétrique en milieu semi-transparent avec transfert radiatif : application au fluage et à la trempe des verres." Thesis, Valenciennes, 2018. http://www.theses.fr/2018VALE0025/document.
Повний текст джерелаMost of glass products on the market come from a high-temperature forming operation, followed by a controlled cooling phase to remove (annealed glass) or generate (tempered glass) residual stresses. Since the mechanical behaviour of the glass is highly thermo-dependent, temperature control is a determining factor for the success of the manufacturing process. During numerical simulations, for this semi-transparent medium, heat exchanges by conduction and radiation have to be considered. In this work, the resolution of the ETR (radiative transfer Equation) is carried out using the "P1 method" and the "Back Ray tracing" (BRT). The two developed codes were validated by the comparative study with the temperature and residual stresses data from the literature on cooling in the thickness of the glass subject to various conditions in natural and forced convection. An experimentation which consists in cooling a glass disk on a metal support was developed in order to compare the temperatures and stresses generated by the testing and by the modelling resulting from the thermomechanical coupling with the two codes P1 and BRT. In a more original way, the BRT method was extended to revolving geometries. A first approach was to study the creep of a glass gob and to analyze the influence of the choice of the ETR's resolution model on the temperatures and geometries during the forming
Nakhoul, Rebecca. "Méthode multi-échelle pour la modélisation du flambage des tôles minces sous contraintes résiduelles : Application au laminage à froid." Phd thesis, Ecole Nationale Supérieure des Mines de Paris, 2014. http://pastel.archives-ouvertes.fr/pastel-00976843.
Повний текст джерелаRoche, Soline. "Propriétés viscoélastiques et plastiques par nano-indentation de couches minces polymères solides : étude en température et en pression." Ecully, Ecole centrale de Lyon, 2004. http://www.theses.fr/2004ECDL0013.
Повний текст джерелаThe topic of this study was to mechanically characterize in nanoindentation and nanoscratch thin polymers layers. The goal is to improve the understanding of thin polymer layer elastic behavior laid on hard substrate. Tests in nanoindentation and nanoscratch were done on thin polymer films laid on different substrates. A rheologic model was used in order to extract the film elastic properties from the measured value linked to {film+substrate}. A specific behavior of thin polymer film has been identified: the anvil effect. In indentation, it is observed in two different ways : increase of the conservation film modulus with the hardness, linked to the film hardening, and decrease of the loss tangent with the hardness, which is explained by increasing the vitreous transition temperature. In scratch test, this effect is related to the increase of the film mechanical properties. Nanoindentation tests have highlighted residual stresses, mainly thermal driven. A new methodology to characterize those residual stresses for a thin polymer film was presented. An interpretation of the anvil effect is proposed. This effect is linked to thin layer pressurized, confined between diamond indenter and hard substrate. Its mechanical properties grow with hydrostatic pressure. This phenomenon is greater for thin layers (< 50μm) with lower mechanical properties than those of the substrate. A logarithmic type evolution law is proposed. A temperature study show isothermal curves of the conservation modulus with the pressure are shifted. The anvil effect can be described by a unic curve, applying additive constants determined at a given reference temperature. It is the same for the film loss tangent. Moreover, the consequences of the anvil effect on the use properties of polymer coating are analyzed: scratch resistance and the adhesion to substrate. A fundamental application of thin film was studied multilayer coatings. It seems that anvil effect is a phenomenon to consider for improvement of mono or multilayer coating scratch resistance. The results obtained on thin layers allow to choose two mix of basecoat and topcoat in order to have an improved bilayer. We have demonstrated that a basecoat between the topcoat and the hard substrate allow an improved scratch resistance of the final coating
Chazottes-Leconte, Aurélien. "Conception et fabrication d'un dispositif de mise en compression par impulsions électro magnétiques (EMP)." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1082.
Повний текст джерелаPenning processes are widely used in industries to apply compressive residual stresses into the most solicited part of mechanical pieces. In that way, the compressive residual stresses limit the priming and the propagation of micro-cracks in the material. This increases significantly the lifespan of the treated mechanical piece under fatigue stresses. These existing peening processes have proved their efficiency and also their limitations and weaknesses. The main recurrent defaults are a shallow depth of treatment, a degradation of the surface condition, a random control of the treatment, a material contamination, etc. These problems have led towards the development of news innovative peening processes which allow better performance avoiding some previous defaults briefly evoked. Among these news processes, the electromagnetic peening process seems especially interesting. This process uses high energy electromagnetic fields to induce Lorentz forces into a metallic piece and thus residual stresses. Actually, there is not much information about this process in the literature and no prototype was ever built. The work of this thesis is dedicated to development and realization of an electromagnetic peening prototype. The first chapter of this thesis adresses the state of the art of major peening processes actually in industrial use. Next, the electromagnetic peening process, or EMP process, is described and the electrical needs are exposed. A second state of the art is made about the technological solutions to respond to the EMP needs. The second chapter is about the conception of the EMP prototype with the electrical structure adopted in the previous chapter. The first step is about the inductor sizing to generate an electromagnetic field sufficient enough for a peening application. Next, the storage system is designed depending on the inductor parameters and finally the closing switch is created considering the electrical parameters used for the EMP process. To validate the previous results, a 3D electromagnetic simulation is done. The prototype assembly is presented in the third chapter and also the first experimental test on the EMP prototype. To begin with, an aluminium alloy with low yield strength is selected to be treated. Two different samples forms are used, a thin one, to realize a similar test to the Almen test and thick one to check the EMP depth of treatment. A 3D multiphysics simulation of these experiments is made and these numeric results are next correlated to the experimental ones. In the fourth chapter, an exploratory study is realized on the effects of the residual stresses on magnetic properties of ferromagnetic material, the mumetal
Anastassiou, Michel. "Influence des conditions de soudage sur les contraintes residuelles dans un point soude par resistance sur toles minces d'acier a bas carbone : relation avec la tenue en fatigue." Paris, ENSAM, 1987. http://www.theses.fr/1987ENAM0012.
Повний текст джерелаCali, José. "Etude des paramètres microscopiques de la piézorésistivité de couches minces polycristallines de silicium dopé bore." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10055.
Повний текст джерелаAl-Hasani, Firas Ali Jawad. "Multiple Constant Multiplication Optimization Using Common Subexpression Elimination and Redundant Numbers." Thesis, University of Canterbury. Electrical and Computer Engineering, 2014. http://hdl.handle.net/10092/9054.
Повний текст джерелаAgnew, M. K. "Weathering products and geochemistry of waste residues at the Brukunga pyrite mine, Adelaide Hills, S.A., in relation to environmental impacts." Thesis, 1994. https://hdl.handle.net/2440/136332.
Повний текст джерелаThe Brukunga Mine is located approximately 50 km east-south-east of Adelaide and was established in 1952 as a source of sulfur for superphosphate. Due to low sulfur prices, the mine was closed in 1972 and since that time has been a source of Acid Mine Drainage (AMD), which has in turn had a dramatic effect of the local and downstream environments. Investigations into the waste dump and mine bench rocks indicate that large quantities of sulfides (up to 22%) are present. Oxidation of sulfides, catalysed by bacteria, quickly form a strongly acidic environment. The lack of significant quantities of rapid neutralising minerals, such as calcite, accentuates and enhances these low pH conditions. Resultant large quantities of acid and heavy metals produced through this oxidation are subsequently released into the surroundings. The contamination is enhanced by the release of lithophile elements formed during slow aluminosilicate neutralisation reactions that are taking place. The pollutants are released into Dawesley Creek, a tributary of the Bremer River, which flows through the mine site. The tailings also add to the acidity problems through similar processes, but here sulfide quantities are much lower. A large accumulation of soluble salts has developed at depth and their location away from the zone of active oxidation indicates that oxidation has not been consistent through time. The development of a cemented layer region at 1-1.4m depth within the tailings is thought to be the preliminary stages of a hardpan. Calculations indicate that the formation of the cemented region is reducing the movement of the oxidation front and therefore the oxidation rate. Combining the two main observations suggests that the oxidation of the tailings is decreasing with time, through a self sealing action. The current environmental hazard the tailings represents is significant. The groundwater movement through the tailings represents a major flushing effect, allowing water with high quantities of ferrous iron to be transported to the dam wall where it is readily oxidised. This, combined, with oxygen from the atmosphere, causes the rapid oxidation of the rocks which make up the dam wall, and represents a major problem. A mechanism to reduce the ground water through-flow needs to be considered.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 1994
Alvarenga, Paula Maria da Luz Figueiredo. "Utilização de residuos orgânicos biodegradáveis na remediação de solos degradados por actividades mineiras." Doctoral thesis, 2009. http://hdl.handle.net/10400.5/2033.
Повний текст джерелаIn this thesis, the effects of different organic matrices, namely (i) compost from unsorted municipal solid waste (MSWC), (ii) compost from garden residues (GWC), and sewage sludge (SS), have been assessed while these amendments were used as immobilizing agents in aided phytostabilization of a highly acidic soil, heavily contaminated by metals, as a consequence of previous mining activities (Aljustrel mine, SW Portugal, western sector of the Iberian Pyrite Belt). Results obtained in this study underlined the importance of an integrated evaluation of soil quality following remediation processes. Actually, despite the ability to correct soil acidity, to immobilize trace metals (Cu, Pb and Zn), and to improve soil nutritional and biochemical features, SS - when used at 100 Mg ha-1 - led to toxicity of soil leachate towards Vibrio fischeri, reduced soil cellulase activity, and exerted toxic effects towards perennial ryegrass (Lolium perenne L.). On the other hand, the application of GWC, a compost low in content of both salinity and heavy metals, and without detectable toxicity when evaluated with a battery of bioassays, did not stimulate significantly either the growth of L. perenne or the soil enzymatic activities due to its scarce ability in correcting soil acidity and supplying macronutrients. Surprisingly, MSWC applied at 50 Mg ha-1, with or without liming, was the most effective organic residue to be used in the immobilization of metals, in this type of mine contaminated soil. This beneficial effect consisted in improved chemical, microbiological, biochemical, and ecotoxicological soil conditions, which stimulated an increase of L. perenne biomass production.-----------------------------Neste trabalho foi estudada a eficácia da aplicação de diferentes materiais orgânicos: (i) composto de resíduos sólidos urbanos com recolha indiferenciada (RSU), (ii) composto de resíduos verdes (RV) e (iii) lama residual urbana (LRU), em estratégias de fitoestabilização de solos degradados por actividades mineiras (Mina de Aljustrel, sector Português da Faixa Piritosa Ibérica). Os resultados obtidos evidenciam a importância de uma avaliação integrada da qualidade do solo num processo de remediação. Embora a LRU tenha corrigido a acidez do solo, melhorado as suas características nutricionais, imobilizado os metais pesados (Cu, Pb e Zn) e promovido uma melhoria nas características microbianas e bioquímicas globais, com um desempenho superior ao dos compostos, quando utilizada em doses de 100 Mg ha-1 promoveu um aumento da toxicidade do lixiviado do solo para o Vibrio fischeri, um decréscimo na actividade das celulases e um crescimento reduzido de azevém perene (Lolium perenne L.). Por outro lado, a aplicação de composto de RV, de baixa salinidade, baixo teor em metais pesados e sem toxicidade detectável por um conjunto de ensaios ecotoxicológicos, não promoveu um aumento significativo no crescimento relativo de L. perenne, nem nas actividades enzimáticas no solo, devido à sua menor capacidade para corrigir a acidez do solo e para fornecer macronutrientes principais. O composto de RSU, aplicado em doses de 50 Mg ha-1, com ou sem calagem, evidenciou-se como o resíduo orgânico mais eficaz na imobilização de metais pesados neste tipo de solos, melhorando as suas características químicas, microbiológicas, bioquímicas e ecotoxicológicas e do seu lixiviado, permitindo as maiores acumulações de biomassa de L. perenne.
Schuwirth, Nele [Verfasser]. "The release of zinc and lead from mine tailings : evaluation of leaching tests, soil water sampling, and sequential chemical extractions with special focus on sphalerite bearing flotation residues with anoxic conditions / vorgelegt von Nele Schuwirth." 2006. http://d-nb.info/980855470/34.
Повний текст джерелаCollister, Grant. "The environmental impact of the Robinson Deep mine residue deposit, Johannesburg." Thesis, 2008. http://hdl.handle.net/10210/462.
Повний текст джерелаProf. J. M. Huizenga Prof. J. Gutzmer
Geldenhuys, Nicolaas Petrus. "Ownership of historic mine and tailings dumps and expropriation / Nicolaas Petrus Geldenhuys." Thesis, 2014. http://hdl.handle.net/10394/15243.
Повний текст джерелаLLM (Environmental Law and Governance), North-West University, Potchefstroom Campus, 2015