Дисертації з теми "Mineral magnetic"
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Yanmin, Wang. "Wet magnetic concentration for weakly magnetic mineral fines and ultrafines." Doctoral thesis, Luleå, 1993. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26710.
Повний текст джерелаGodkänd; 1993; 20070426 (ysko)
Schmidt, Volkmar. "Magnetic and mineral fabrics in carbonate rocks /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17090.
Повний текст джерелаSmith, J. P. "Mineral magnetic studies on two Shropshire-Cheshire meres." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372707.
Повний текст джерелаWatson, D. J. "Mineral magnetic and palaeomagnetic properties of continental shelf sediments." Thesis, University of Edinburgh, 1989. http://hdl.handle.net/1842/14648.
Повний текст джерелаYang, Ying Ping. "Electromagnetic characteristics of synthetic rocks, and sulphide and oxide mineral assemblages." Thesis, The University of Sydney, 1995. https://hdl.handle.net/2123/26849.
Повний текст джерелаSandström, Dan. "Solid state nuclear magnetic resonance studies of synthetic mineral surfaces." Doctoral thesis, Luleå tekniska universitet, Industriell miljö- och processteknik, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26480.
Повний текст джерелаGodkänd; 2006; 20061205 (haneit)
Sandström, Dan. "Solid state nuclear magnetic resonance studies of synthetic mineral surfaces /." Luleå : Luleå tekniska universitet/Tillämpad kemi och geovetenskap/Kemi, 2006. http://epubl.ltu.se/1402-1544/2006/26/LTU-DT-0626-SE.pdf.
Повний текст джерелаHannam, Jacqueline Ann. "Processes and timescales of secondary magnetic mineral formation in topsoils." Thesis, University of Liverpool, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366393.
Повний текст джерелаYu, L. "Environmental applications of mineral magnetic measurement : Towards a quantitative approach." Thesis, University of Liverpool, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234577.
Повний текст джерелаJirestig, Jan A. "High intensity and high gradient magnetic separation in mineral processing." Doctoral thesis, Luleå tekniska universitet, 1994. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25815.
Повний текст джерелаGodkänd; 1994; 20070429 (ysko)
Jones, M. D. H. "The magnetic deposition record in some Scandinavian peat profiles." Thesis, University of Liverpool, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377116.
Повний текст джерелаHall, Stephen Thomas. "Enhancement of magnetic susceptibility by leaching and application in mineral separation." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=71807.
Повний текст джерелаThis leach treatment significantly increases the magnetic susceptibility of coal-pyrite permitting improved high-gradient magnetic desulfurization of a high pyritic sulfur coal.
The leach treatment also enhances the magnetic susceptibility of other iron-containing mineral sulfides. However, application of this leach pretreatment in sulfide/sulfide separations is limited due to galvanic coupling effects which passivate the susceptibility increase reaction. In the presence of oxides, coal and probably other non-sulfides passivation does not occur and the susceptibility of the iron-bearing sulfide increases. The potential exists for the application of the leach as a pretreatment in enhancing fine iron-containing sulfide/non-sulfide magnetic separations.
Walden, John. "The use of mineral magnetic analysis in the study of glacial diamicts." Thesis, University of Wolverhampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259185.
Повний текст джерелаFrance, Derek Edward. "The mineral magnetic characterisation of goethite and haematite in soils and sediments." Thesis, University of Liverpool, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263900.
Повний текст джерелаKerbey, Mark Henry. "Tag deposition kinetics and selectivity in the magnetic tagging of mineral suspensions." Thesis, University of Exeter, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312285.
Повний текст джерелаJones, Hannah Amy. "Sediments in urbanised river catchments : an integrated sedimentological and magnetic mineral approach." Thesis, Manchester Metropolitan University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412634.
Повний текст джерелаIvakhnenko, Oleksandr Petrovych. "Magnetic analysis of petroleum reservoir fluids, matrix mineral assemblages and fluid-rock interactions." Thesis, Heriot-Watt University, 2006. http://hdl.handle.net/10399/140.
Повний текст джерелаFischer, Håkon. "Magnetic and spectroscopic investigations of mineral transformations in mixed-valence oxides and magnesium silicates /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17774.
Повний текст джерелаSandström, Dan. "Dipolar recoupling sequences in ¹³C and ³¹P nuclear magnetic resonance studies of mineral surfaces /." Luleå, 2004. http://epubl.luth.se/1402-1757/2004/022.
Повний текст джерелаCrosby, Christopher James. "Application of mineral magnetic measurements as a pollution proxy for urban road deposited sediment." Thesis, University of Wolverhampton, 2012. http://hdl.handle.net/2436/265493.
Повний текст джерелаBooth, Colin Anthony. "Sediment-source-linkages in the Gwendraeth Estuary, south Wales, based on mineral magnetic analyses." Thesis, University of Wolverhampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394037.
Повний текст джерелаJones, Keith Richard. "Circulation, deposition and post-depositional changes of sediment in two Welsh estuaries : a mineral magnetic investigation." Thesis, University of Wolverhampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366147.
Повний текст джерелаDavies, Erika. "Finding a place for citrate : an NMR crystallographic approach to the study of bone mineral." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610808.
Повний текст джерелаGungor, Kazim. "Production Of Heavy-media-quality Magnetite Concentrate From Kesikkopru Iron Ore Tailings." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611830/index.pdf.
Повний текст джерелаPRÜ
IRON ORE TAILINGS Gü
ngö
r, Kazim M. Sc. Department of Mining Engineering Supervisor: Prof. Dr. M. Ü
mit Atalay May 2010, 91 pages The aim of this research was to investigate the possibility of the production of a magnetite concentrate which is suitable for preparation of heavy media from iron ore tailings of Gü
ncem Mining Company magnetic separation facility. During the study, three different tailings named as low grade, medium grade and high grade with 5.91 % Fe3O4, 19.06 % Fe3O4 and 37.06 % Fe3O4, respectively, were used. Mineralogical analyses of test samples showed that magnetite and hematite were the major ore minerals while pyrite and chalcopyrite were found in trace amounts. Actimolite, tremolite, epidote, chlorite, quartz, calcite, and dolomite were the gangue minerals. The effects of feed particle size and applied magnetic field intensity on the Fe3O4 grade and recovery of concentrate were examined throughout magnetic concentration tests. The highest grade magnetite concentrate with 79.98% Fe3O4 content was obtained with 65.42% recovery from 100% -75 micron size feed at 1000 Gauss magnetic field intensity from high grade tailing.
Kyle, Clinton. "Influence of magnetic field exposure and clay mineral addition on the fractionation of Greek yogurt whey components." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/19021.
Повний текст джерелаFood Science Institute
Jayendra Amamcharla
Greek yogurt is one of the largest-growing sectors in the dairy industry accounting for over 25% of yogurt sales in the United States. Greek yogurt is produced by removing a portion of water and water soluble components from yogurt. Consequently, a large quantity of Greek yogurt whey (GYW) is being produced as a co-product. GYW is compositionally different from cheese whey, and thus poses economic and environmental challenges to the dairy industry. The objective of the present study was to evaluate two physical treatments as alternative methods for separating valuable GYW components: magnetic fluid treatment (MFT) and the addition of sepiolite, a clay mineral. A MFT chamber was designed using four pairs of neodymium magnets arranged to produce a magnetic field strength of 0.6 Tesla. Three batches of GYW each from two manufacturers were procured. A 2×3 factorial design was used with MFT or without MFT and the addition of zero, two, or four grams of sepiolite per 100g of GYW. The pH of GYW was adjusted to 7.2 using 5N NaOH solution, and the GYW was pumped at a rate of 7.5 L/min through the MFT system with or without MFT chamber attached. The sample was split into three sub-samples, heated to 80°C, and sepiolite was added as per the experimental design. The samples were centrifuged at 1,000g for five minutes. The top aqueous layer was separated and analyzed for total solids, ash, lactose, protein, calcium, phosphates, and sodium content along with color. MFT did not influence the analyzed whey components (P > 0.05) except for lactose. However, addition of sepiolite influenced protein content and a* and b* color values for the top aqueous layers (P < 0.05). Both levels of sepiolite addition resulted in about a 50% decrease in protein compared to original GYW. Adding two grams of Sepiolite per 100g of GYW from manufacturer 1 resulted in b* decreasing from 25.99 to 8.16 compared to treated GYW with no sepiolite. Sepiolite was found to have possible applications in the removal of proteins and color pigments in GYW.
Belo, Fernandes Ivan. "Geometallurgical approach to understand how the variability in mineralogy at Zinkgruvan orebodies affects the need for copper activation in the bulk rougher-scavenger flotation." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65392.
Повний текст джерелаAl-Ali, Safaa Hussein Ali. "Mineralogy and mineral processing to optimise recovery of synchysite-(Ce) and apatite from carbonatite at Songwe Hill, Malawi." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/28823.
Повний текст джерелаBatista, Sergio Luchini. "Osteoporose na doença de Cushing: valor preditivo da quantificação de adiposidade visceral e óssea sobre a remodelação e densidade mineral óssea." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/17/17138/tde-30032017-085813/.
Повний текст джерелаThe anti-inflammatory and immunosuppressive properties of glucocorticoids (GC) justify the use of these steroids in various clinical conditions, despite its significant adverse effects. Osteoporosis induced by glucocorticoids (OIG) is considered the most important cause of secondary osteoporosis. It is a multifactorial disease involving systemic, tissue and bone cell signaling changes. Furthermore, hypercortisolism is also associated with obesity, redistribution of fat, insulin resistance and diabetes mellitus. Interestingly, these metabolic disorders in which bone mass is preserved, there is increased bone fragility. In recent years, evidence shows various complex interaction between the mineral and energy metabolism, in particular between adipose tissue and bone. In this scenario, Cushing\'s disease (CD) is a desirable clinical model to evaluate various mechanisms involved in the complex process of developing osteoporosis. The objective of this study was to evaluate, in a baseline study and a prospective study, various aspects of the interaction between the mineral and energy metabolism in women with DC and their possible impact on bone mass, as well as the association between bone mass and different types of adipose tissue. In the baseline study, we evaluated three groups of individuals, matched by sex and age: control group (C, n = 27), obese (O; n = 16) and Cushing\'s disease group (CD, n = 16). In the prospective study, we evaluated the CD group at three time points: preoperative (Pre-op; n = 11), 6 months postoperative (6th month PO; n = 10) and 12 months postoperatively (12th month PO; n = 10). In the baseline study, the O and CD groups differed in relation to C as the weight and BMI (p <0.05). The CD group showed significantly higher blood glucose, insulin, glycosylated hemoglobin (HbA1c), HOMA-IR and leptin in relation to the C and O groups (p <0.05). Additionally, the CD group showed lower levels of osteocalcin in relation to the C and O groups (p <0.05) as well as PTH, 25-OH vitamin D (25 (OH) D), and adiponectin in relation to the C group (P <0.05). There was no difference between the groups regarding dosages of IGF-I and preadipocyte factor 1 (Pref-1). The CD group had lower bone mass in the lumbar spine in relation to the C and O groups (p <0.05) and lower bone mass in the total body when compared to the O group (P <0.05). The Trabecular bone score (TBS) was able to show impaired bone quality in groups O and CD, showing greater involvement in CD group (p <0.05). Bone marrow adiposity (BMA) in L3 was significantly higher in the CD group compared to the C and O groups (p <0.05). The CD group showed increased subcutaneous fat content (SAT), visceral (VAT), VAT/SAT ratio and intrahepatic lipid (IHL) in relation to the C group (p<0.05). Additionally, the CD group had a higher content of VAT in relation to the O group (p<0.05). Osteocalcin correlated positively with TBS (r = 0.5, p <0.0001) and negatively with HOMA-IR (r = -0.4, p <0.01) and AMO of L3 (r = - 0.4, p <0.01). The TBS was negatively correlated with HOMA-IR index (r = -0.6, p <0.0001) and AMO of L3 (r = - 0.5, p <0.001). The AMO of L3 positively correlated with BMI (r = 0.4, p <0.01), HOMA-IR (r = 0.3, p <0.05), leptin (r = 0.3, p < 0.05), VAT/SAT ratio (r = 0.6, p <0.0001) and IHL (r = 0.5, p <0.05). In the prospective study, there was a reduction in weight and BMI and blood glucose, insulin, HOMA-IR, glycated hemoglobin and leptin (p <0.05). Additionally, there was increased levels of 25(OH)D, osteocalcin and deoxypyridinoline (p <0.05). There were no significant differences between the levels of adiponectin and Pref-1. The TBS was stable and there was no occurance of new fractures by vertebral fracture assessment (VFA). In body composition by dual-energy X-ray absorptiometry (DXA), threre was a reduction of total fat mass and improvement in apendicular lean body mass index by Foundation for the National Institutes of Health (FNIH) (p <0.05). The BMA of L3 significantly reduced in the 6th month PO, remaining stable on the 12th month PO (p <0.05). There was a significant reduction of VAT, VAT/SAT ratio and IHL in the prospective follow-up (p <0.05). This study confirms previous data showing that endogenous hypercortisolism has a profound negative effect on the skeleton, in particular on trabecular bone. Moreover, it is the first study to show that there is a negative correlation between TBS with HOMA-IR and BMA; it is possible that changes in energy metabolism are at least partly responsible for the increased risk of fracture in DC.
Hutchinson, Simon Mark. "The use of mineral magnetic and radiometric measurements in the study of erosion processes and sediment sources in upland catchments." Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277486.
Повний текст джерелаDillon, Melanie [Verfasser], Ulrich [Akademischer Betreuer] Bleil, and Sabine [Akademischer Betreuer] Kasten. "Assessing the fidelity of the marine sedimentary magnetic record:Preservation and diagenetic alteration of magnetic mineral assemblages in upwelling regions off western Africa / Melanie Dillon. Gutachter: Ulrich Bleil ; Sabine Kasten. Betreuer: Ulrich Bleil." Bremen : Staats- und Universitätsbibliothek Bremen, 2008. http://d-nb.info/1072572273/34.
Повний текст джерелаCarvalho, Bruno César Lage de. "Aproveitamento de minérios de ferro de baixo teor: tendências, tecnologias utilizadas e influências no sequenciamento de lavra." Programa de Pós-Graduação em Engenharia Mineral. Departamento de Engenharia de Minas, Escola de Minas, Universidade Federal de Ouro Preto, 2012. http://www.repositorio.ufop.br/handle/123456789/2346.
Повний текст джерелаApproved for entry into archive by Neide Nativa (neide@sisbin.ufop.br) on 2013-02-25T14:03:40Z (GMT) No. of bitstreams: 1 DISSERTAÇÃO_AproveitamentoMinériosFerro.pdf: 4941141 bytes, checksum: 7fc54169ae9d05ca62dad2964a3d2b36 (MD5)
Made available in DSpace on 2013-02-25T14:03:40Z (GMT). No. of bitstreams: 1 DISSERTAÇÃO_AproveitamentoMinériosFerro.pdf: 4941141 bytes, checksum: 7fc54169ae9d05ca62dad2964a3d2b36 (MD5) Previous issue date: 2012
Essa dissertação descreve a situação atual e as tendências relacionadas ao tratamento de minérios de ferro de baixo teor na indústria mineral, utilizando um estudo de caso e uma discussão sobre o projeto de implantação de uma instalação de tratamento de itabiritos de baixo teor, denominada ITM-S, a ser instalada em uma empresa mineradora de ferro no Estado de Minas Gerais. Seu objetivo principal foi analisar a viabilidade técnica e econômico-financeira desse projeto, com base nos conceitos existentes na metodologia FEL (Front-End-Loading), associados aos conceitos de sequenciamento de lavra, beneficiamento mineral e economia mineral. Foram analisados, na metodologia, dois cenários do projeto para a escolha das alternativas de rotas de processo: com o uso de separação magnética (cenário 1), e sem a utilização de separação magnética (cenário 2). Os resultados mostraram que o cenário 2 é o mais viável economicamente, devido principalmente a redução do investimento por tonelada produzida, dentre outros fatores. Pretende-se apresentar as várias evoluções nos processos de tratamento de minério de ferro, e apresentar uma metodologia adequada para análise de viabilidade de projetos de tratamento e aproveitamento de minérios de ferro marginais, como a metodologia FEL, associada aos conceitos existentes na engenharia de minas. ____________________________________________________________________________________________________
ABSTRACT: This dissertation describes the current situation and trends related to the exploitation of low-grade iron ore in the mineral industry, to accomplish it, a case study and a discussion on the implementation project of a treatment facility for low grade itabirites called ITM-S, to be installed in an iron ore mining company in the State of Minas Gerais, are presented. The main objective was to analyze the technical and economic-financial feasibility of this project, based on FEL methodology (Front-End- Loading) existing concepts, associated with the mining concepts of sequencing, mineral processing and mineral economics. Using this methodology, two project’s scenarios were analyzed in order to help to choose between two alternative routes: magnetic separation usage (scenario 1), and no usage of magnetic separation (scenario 2). The results showed that scenario 2 is the most economically viable; mainly due to reduction of the investment per ton produced, among other factors. This work intends to present the various evolutions in the iron ore treatment processes, and to present an appropriate methodology for marginal iron ore project feasibility analysis, such as the FEL methodology, associated with the existing concepts in mining engineering.
Darrigo, Emiliana Ribeiro. "Associação do tecido adiposo medular ósseo, massa óssea e a expressão do receptor tipo 1 dos IGFs em crianças e adolescentes obesos." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/17/17144/tde-10042018-142935/.
Повний текст джерелаThe adipose and bone tissue has an intimate relationship, from the common origin in stromal stem cells derived from the bone marrow. It is known that body weight has a close correlation with bone mass in humans. However, it is still unclear which component of body weight has a greater influence on bone mass gain and adiposity in the bone marrow, since both individuals with low weight and obese have high fracture rates. The objective of this study was to compare obese and eutrophic children and adolescents in relation to bone composition, bone marrow adiposity in the lumbar spine (L3), expression of IGF type 1 receptor (IGF1R) and serum concentrations of IGF-I and to seek correlation between these variables. For this, children and adolescents between 10 and 17 years old were divided into control and obese groups. These groups were submitted to anthropometric evaluation, bone densitometry of the lumbar spine and total body and lumbar spine and total abdominal magnetic resonance, in addition to serum levels of biochemical and hormonal parameters. The patients in the obese group had a positive association of bone mineral density with both fat mass and lean mass while the control group showed a positive association of bone mineral density with fat mass only. There was no difference between the groups regarding bone marrow adiposity, nor regarding IGF-I, IGFBP3 and IGF1R gene expression.
Martins, Lucelene. "Condições de cristalização de granitos sin- e tardi-orogênicos da porção central do batólito Agudos Grandes, SP, com base em geoquímica de minerais e rochas." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/44/44135/tde-19042007-135922/.
Повний текст джерелаMagnetic susceptibility (MS) measurements and mineral and rock chemistry were used to infer crystallization conditions of syn- to late-orogenic (610-600 Ma) granites of the eastern portion of the Agudos Grandes batholith (central Ribeira Belt, SE Brazil). The syn-orogenic granites are metaluminous and have color indices (IC) of 8 to 15 given by hornblende, biotite, titanite and magnetite (unit HBgd). Liquidus temperatures obtained by apatite saturation thermometry decrease slighlty, from 1000 to 950°C with fractionation. Solidus temperatures, derived from hornblende-plagioclase thermometry, raise eastwards in the batholith from 720 to 800° C, reflecting decreasing a(H2O) of the magmas. Pressures derived from Al-in-hornblende barometry are nearly invariable (3.6 to 4.5 kbar), showing that the batholith is exposed at approximately the same level of intrusion along the studied section. These granites crystallized under strongly oxidizing conditions (DNNO ³ + 2), as revealed by high MS, by the compositions of biotite and relict ilmenite, and by ilmenite consumption due to fO2 above the TMQA buffer. The late-orogenic granites (Piedade massif) are metaluminous to marginally peraluminous. The metaluminous unit (BmgT; IC=8) bears titanite and magnetite, and crystalized under conditions comparable to those shown by the syn-orogenic massifs. The remaining units are made up of biotite + ilmenite (± muscovite and magnetite) granites with variable IC (15 to 5). These rocks crystallized mostly under more reduced conditions (QFM to DNNO = + 2), as revealed by lower MS and by the compositions of biotite and ilmenite, but were locally affected by post-magmatic oxidation processes. The liquidus temperatures obtained from apatite saturation thermometry in all granites from the Piedade massif are as high as those of the syn-orogenic massifs. Pressure estimates, based on muscovite compositions, are less reliable, but yield values around 4 kbar. The data obtained in this work are consistent with models which admit a genetic link between the syn-orogenic and the late-orogenic granites of the Agudos Grandes batholith. Continuous chemical variation of biotites, with the siderophyllite component increasing steadily towards the muscovite-bearing granites, and parallel decreasing of MS and fO2 suggest that contamination of metaluminous magmas by more reduced metasediments could explain most of the variation observed.
Gyllencreutz, Richard. "Holocene and Latest Glacial Paleoceanography in the North-Eastern Skagerrak." Doctoral thesis, Stockholm : Department of Geology and Geochemistry, Stockholm University, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-413.
Повний текст джерелаFarwig, Victoria Jane. "Evaluation of mineral magnetic properties and thermal activation characteristics of soil material in reconstructing post-fire sediment redistribution and fire history, Sydney Basin, Australia." Thesis, Swansea University, 2006. https://cronfa.swan.ac.uk/Record/cronfa43195.
Повний текст джерелаBadesab, Firoz [Verfasser], Tilo von [Akademischer Betreuer] Dobeneck, and Karin [Akademischer Betreuer] Bryan. "Magnetic mineral enrichment and transport in coastal environments: Tauranga Harbour, Northeastern, New Zealand / Firoz Badesab. Gutachter: Tilo von Dobeneck ; Karin Bryan. Betreuer: Tilo von Dobeneck." Bremen : Staats- und Universitätsbibliothek Bremen, 2012. http://d-nb.info/1072046717/34.
Повний текст джерелаRodrigues, Diana Magalhães Cunha. "Prospecção geoquímica: estaurolita, ilmenita e magnetita como minerais traçadores para depósitos do tipo VMS." Universidade do Estado do Rio de Janeiro, 2011. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=3093.
Повний текст джерелаConselho Nacional de Desenvolvimento Científico e Tecnológico
A região de Itutinga foi alvo de estudos prospectivos por parte da empresa BP mineração na década de 80, onde foram encontradas mineralizações em lentes de sulfetos metálicos (Zn-Cu-Ag-Fe) associados a rochas komatiíticas peridotíticas e basaltos toleíticos (anfibolitos) do greenstone belts, nas proximidades da fazenda São Jerônimo, enquadrando-se em um depósito do tipo VMS. A partir destas informações encontradas na literatura propôs-se estudar a estaurolita, a magnetita e a ilmenita para, a partir da determinação do seu conteúdo em zinco, indicar a aplicabilidade destes três minerais como traçadores desses tipos de depósitos. Para isso foram coletadas amostras de sedimentos de corrente e concentrados de batéia na região próxima à ocorrência, no entorno da cidade de Itutinga, e também em uma região próxima a cidade de Itumirim, já que existem semelhanças litológicas entre as duas áreas. Os sedimentos de corrente, as frações magnéticas e as frações de 0,3A (separador eletromagnético Frantz) foram enviados para análises químicas por absorção atômica e ICP-OES. Os concentrados de batéia foram descritos, separando-se cristais de estaurolita de cada amostra coletada, e analisando-os em MEV-EDS para determinação da química mineral. Os resultados dos sedimentos de corrente apontaram que os pontos da fazenda São Jerônimo (ME-03, Itutinga 51,7 ppm de Zn) e o ponto do Ribeirão Santa Cruz, (ME-06, Itumirim 36,1 ppm de Zn) foram os que apresentaram melhores resultados, indicando anomalias em zinco nas duas áreas estudadas . As estaurolitas, retiradas dos concentrados de batéia de cada ponto estudado, foram divididas em três conjuntos, de acordo com os teores de ZnO encontrados: 1 - entre 2,96% e 3,25% de ZnO em peso; 2 - entre 2,03% e 2,76% de ZnO em peso; 3 - < 1,67% de ZnO em peso, sendo comparável com outras estaurolitas encontradas em diversos depósitos de Zn do mundo, como Dry River, Austrália e Palmeirópolis Goiás. Assim, as estaurolitas apresentam bons resultados como minerais indicadores na área estudada. Em relação as magnetitas e ilmenitas estudadas, o número de amostras coletadas no presente estudo foram muito pequenas para se ter informações conclusivas sobre o papel destes minerais como traçadores. Por outro lado, os resultados das análises químicas nos concentrados de ilmenita (até 856 ppm de Zn) e nos concentrados de magnetita (até 216 ppm de Zn), indicam a disponibilidade deste metal nas áreas estudadas. Assim, é possível se detectar a presença do zinco por dois meios: através de sedimentos de corrente, através de halos de dispersão química do elemento zinco, e através dos minerais resistatos (estaurolita zincífera, magnetita e ilmenita), a partir de uma dispersão clástica do grão.
The Itutinga region was studied for BP mineration in 80s , where they found sulphide mineralization in lenses (Zn-Cu-Ag-Fe) associated with komatiitic peridotite rocks and tholeitic basalts (amphibolites) of greenstone belts, near of Fazenda São Jerônimo. With this information in the literature the propose is study the staurolite, magnetite and ilmenite for indicating the applicability of these three minerals as tracers of these types of mineralization. For this, samples of stream sediment and panning concentrates in the region near the city of Itutinga, and also in a region near the city of Itumirim. The stream current, magnetic fractions and ilmenite fractions were sent to chemistry analyses (Atomic absorption and ICP-OES), and the panning concentrates were analyzed for the separating of staurolite crystals, and sent to SEM-EDS. The stream sediments results showed that the point of Fazenda São Jerônimo (ME-03, Itutinga 51,7 ppm of Zn) and the point of Ribeirão Santa Cruz (ME-06, Itumirim 36,1 ppm of Zn) were presented the best result. The staurolite of panning concentrates were divided into three groups according to levels of ZnO matched: 1 - between 2.96% and 3.25% by weight of ZnO, 2 - from 2, 03% and 2.76% by weight of ZnO, 3 - <1.67% ZnO by weight, comparable with other staurolite found in many zinc deposits in the world, such as Dry River, Australia and Palmeirópolis Goiás. Thus, the staurolite show good results as indicator minerals in the area. With respect to magnetite and ilmenite concentrates, the number of samples collected in both areas was too small to have conclusive information. On the other hand, the results of the chemical ilmenite (up to 856 ppm Zn) and magnetite (up to 216 ppm Zn), indicate the availability of this metal in the areas studied. Thus, it is possible to detect the presence of zinc by two means: through stream sediments through chemical dispersion halos of zinc, minerals and through resistive minerals (zincian staurolite, magnetite and ilmenite), from a crystal clastic dispersion.
Velandia, Astrid Siachoque. "Mecanismos de alojamento e deformação da fácies albita granito do plúton madeira, Mina Pitinga (AM)." Universidade Federal do Amazonas, 2015. http://tede.ufam.edu.br/handle/tede/4667.
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The albite granite is the latter facies of the A-type Madeira granite with alkaline affinity, which is a special Orosirian pulse of the A-type magmatic event in the Tapajós-Parima Province into Amazon craton. This facies is subdivided in two subfacies, the core albite granite and the border albite granite. The petrographic study allowed identify that the principals constituent minerals of the magmatic phase in these rocks undergone weak solid-state deformation, in which it is found locally feldspars with grain boundary migration, undulate extinction and mechanical twinning, as well as, some elongate crystals of quartz displaying typical chessboard pattern with slip planes preferably in the a-axes, dynamic recrystallization, subgrain rotation and inclusions of albite according to the limits of the crystals. These microstructures in granitic rocks indicate strain rates under intermediated to high temperatures. Geometric and kinematic analysis of the structures in the albite granite showed that: this granitic rock was deformed during a magmatic stage recording the S0 magmatic foliation, which was grouped in two orientations: N67°W/52°E e S79°W/58°N (predominant). The anisotropy of magnetic susceptibility and shape preferred orientation study, confirm the stability of the primary deformation in the albite granite, these results revealed predominantly subcoaxial magnetic and mineral fabrics in both subfácies. Subsequently, the albite granite was affected by brittle deformation through of transcurrent shear zones (ZCA-B) with plunges S70°W/56°N and S23°E/58°W respectively, and dominant dextral strike-slip component associated with the principal shear zone ZCA, as well as, normal faulting (FR) with prevailing attitude S60°E/58°S and normal-sense movement. The progressive petrological evolution and continue structural pattern of the albita granite facies with respect to earlier facies of Madeira granite, define that the emplacement in the upper crust of the different pulses in this granite, was result of nested pluton process controlled by NE-SW trending strike-slip system and predominantly dextral kinematics, which is an expression of regional deformation.
A fácies Albita granito é a fácies mais tardia do granito Madeira de afinidade alcalina a qual é um especial pulso do magmatismo tipo A que se desenvolveu de forma expressiva no período Orosiriano na província Tapajós-Parima no cráton Amazônico. Esta fácies se subdivide em duas subfácies: Albita granito de núcleo e Albita granito de borda. O estudo petrográfico permitiu identificar que os minerais constituintes da fase magmática destas rochas apresentam localmente feições de deformação plástica, cristais de K-feldspato e albita com limites lobados por migração de borda, extinção ondulante e geminação mecânica, assim como fenocristais de quartzo exibindo extinção ondulante em padrão de tabuleiro de xadrez com planos de deslizamento preferencialmente no eixo , recristalização dinâmica, rotação de subgrãos e inclusões de albita e alinhadas segundo os limites dos cristais. Estas microestruturas em rochas graníticas indicam taxas de deformação sob temperaturas intermediárias. Análises geométrica e cinemática das estruturas levantadas em campo nas subfácies do Albita granito, comprovaram que localmente a rocha se deformou ainda num estágio magmático, registrando foliação magmática S0, agrupada em duas orientações: N67°W/52°E e S79°W/58°N (predominante). Os resultados do estudo de anisotropia de susceptibilidade magnética e orientação preferencial de forma avaliam localmente a estabilidade da petrotrama dúctil medida em afloramento e registram tramas magnética e mineral predominantemente subparalelas nas duas subfácies. Posteriormente, o Albita granito foi deformado rúptilmente por zonas de cisalhamento transcorrentes (ZCA-B) orientadas S70°W/56°N e S23°E/58°W, com cinemática dextral dominante associada ao cisalhamento principal ZCA, e por falhamento normal (FR) com atitude predominante S60°E/58°S, sob os efeitos de um campo regional de esforços que se manteve estável durante sua cristalização e deformação. A progressiva evolução petrológica e continuo padrão estrutural da fácies Albita granito com respeito às fácies mais precoces do granito Madeira refletem que o alojamento dos diferentes pulsos magmáticos deste granito na crosta superior, ocorreu associado com processos de nested plutons controlados por um contexto regional de deformação transcorrente com trend NE-SW e cinemática dextral predominante.
Silva, Luciana Tabajara Parreiras e. "Influência do tecido adiposo, adiposidade da medula óssea e das incretinas sobre a densidade mineral óssea de pacientes com síndrome do intestino curto." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/17/17138/tde-20072018-100203/.
Повний текст джерелаShort bowel syndrome (SBS) is a complex disease that occurs after extensive resection of the small intestine leading to malabsorption of nutrients and fluids, a condition that can cause severe watery diarrhea, dehydration and acute weight loss, developing high risk for the appearance of osteometabolic disease. Studies have shown the progress on the physiological interaction of the skeleton with the various systems, including energetic metabolism and the gastrointestinal tract. Peptides originated not only in adipose tissue but also in the intestine such as incretin [GIP (Glucose-dependent insulinotropic polypeptide) and GLP1 (glucagonlike peptide 1) modulate bone remodeling activity. The main objective of the current study was to evaluate the influence of subcutaneous (SAT), visceral (VAT) adipose tissue, intrahepatic lipids (IHL), bone marrow fat adipose tissue (MAT), as well as the influence of GIP, GLP1, and ghrelin on the bone mineral density (BMD) of SBS patients. It is a prospective observational study composed by two experimental groups matched by height, age and sex: a) the control group (CG) (n = 18; 9M,9F) and b) the SBS group which were evaluated in two occasions with a period between analyzes of one year: named SBS0 (n = 14; 7M,7F) and SBS1 (n = 11; 6M,5F). Compared to CG, SBS patients throughout the study had significantly lower BMD and elevated IHL and GIP (p< 0.05). Values of MAT, GLP1 and ghrelin were similar between groups. MAT was negatively and significantly correlated with L3 BMD in the CG (r = -0.6; p< 0.05) and positively correlated, but not significant with L3 BMD in the SBS group throughout the study: SBS0 (r= 0.45; p= 0.13) and SBS1 (r= 0.45; p= 0.17). IHL was negatively and significantly associated with femoral neck BMD (R²= 0.16; p< 0.05) and total hip BMD (R²= 0.27; p< 0.05). The occurrence of osteoporosis is frequent in SBS patients, but MAT is not increased in these patients and had positive correlation with BMD, although not significant. Access to calories seems to positively affect the relationship between MAT and bone mass. IHL appear to negatively affect bone mass in SBS patients.
Whiting, Thomas H. "A study of the lithology and structure of the eastern Arunta Inlier based on aeromagnetic interpretation : a lithological subdivision and structural history of the eastern Arunta Inlier, with particular emphasis on the relationship between magnetic mineral petrogenesis, rock magnetism and aeromagnetic signature /." Title page, contents and abstract only, 1987. http://web4.library.adelaide.edu.au/theses/09PH/09phw6125.pdf.
Повний текст джерелаLi, Zhengnan. "Vortex magnetic separation (VMS)." Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292447.
Повний текст джерелаNouvel, Guy. "Etude par spectrometrie raman des phonons et des excitations electroniques dans les trichalcogenures d'uranium." Toulouse 3, 1987. http://www.theses.fr/1987TOU30056.
Повний текст джерелаLeißner, Thomas. "Beitrag zur Kennzeichnung von Aufschluss- und Trennerfolg am Beispiel der Magnetscheidung." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2016. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-206695.
Повний текст джерелаCavanough, Gary. "Measurement of magnetic susceptibility in titanium minerals processing /." St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17774.pdf.
Повний текст джерелаJones, J. M. "Magnetic minerals and heavy metals in ombrotrophic peat." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372671.
Повний текст джерелаDunsford, Helen Mary. "The response of alluvial fans and debris cones to changes in sediment supply, upland Britain." Thesis, Durham University, 1999. http://etheses.dur.ac.uk/1468/.
Повний текст джерелаBoehm, Josef. "A study of the open gradient magnetic separation method." Thesis, University of Salford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.291728.
Повний текст джерелаSwarts, Arnoldus Carel. "The Influence of magnetic fields on the flotation of sulphide minerals." Diss., Pretoria : [s.n.], 2001. http://upetd.up.ac.za/thesis/available/etd-02192007-094826.
Повний текст джерелаGoss, K. J. "Chemical remanent magnetisation and phase transformations in iron oxide minerals." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233951.
Повний текст джерелаGonzalez, Lucena Fedora. "Mineral Magnetism of Environmental Reference Materials: Iron Oxyhydroxide Nanoparticles." Thesis, Université d'Ottawa / University of Ottawa, 2010. http://hdl.handle.net/10393/19608.
Повний текст джерела