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Dissertations / Theses on the topic 'Liquid iron'

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Published: 4 June 2021
Last updated: 6 September 2023

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1

Parvin, Nader. "Interaction of liquid copper with sintered iron compacts." Thesis, Aston University, 1989. http://publications.aston.ac.uk/11880/.

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Interaction of liquid copper with sintered iron is important in brazing, liquid phase sintering and infiltration. In brazing, the penetration of liquid copper into the pores is to be `avoided', whereas in infiltration processes it is `encouraged', and in liquid phase sintering it should be `controlled' so that optimum mechanical properties are achieved. The main objective of the research is to model the interaction by studying the effect of the process variables on the mechanisms of copper interaction in Fe-Cu and Fe-Cu-C systems. This involves both theoretical and experimental considerations.
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2

Sidhu, Mandeep Singh. "Liquid Aluminium Corrosion Characteristics of Cast Iron and Steel." Thesis, University of Canterbury. Mechanical Engineering, 2012. http://hdl.handle.net/10092/7013.

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Cast iron and steel alloys are commonly used for tooling and structural components in Al production, Al die-casting and the aluminizing industry due to their favourable properties including high strength, good formability and low cost. However, the iquid Al corrosion of these materials is one of the crucial concerns in maintaining the efficient production. Al is produced by the electrolytic smelting of alumina. Cast iron and/or cast steel pipes - commonly known as „tapping pipes‟ - are used to extract the liquid Al produced by smelting. Tapping pipes mainly degrade by material loss because liq
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3

Monaghan, Brian Joseph. "The kinetics of liquid iron dephosphorization using lime based slags." Thesis, University of Strathclyde, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.626859.

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4

Kapilasharmi, Era. "Investigation of Interactions between Liquid Iron Containing Oxygen and Aluminosilicate Refractories." Doctoral thesis, KTH, Materials Science and Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3625.

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<p>The present work was initiated to investigate runnerrefractory corrosion by molten steel. The aim was to understandthe mechanism of inclusion formation during ingot casting. Thework is also of interest to other unit processes in steelmaking, where refractory corrosion and erosion are seriousproblems. The oxides investigated in the present work werealumina, silica and mullite, which are the main components inrunner refractory. In addition, industrial refractory materialwas investigated.</p><p>Two types of experiments were conducted. The first, "rodexperiments", involved dipping a rod of the
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5

Jones, Karen Lorraine. "Analysis of ferredoxin and flavodoxin in Anabaena and Trichodesmium using fast protein liquid chromatography." PDXScholar, 1988. https://pdxscholar.library.pdx.edu/open_access_etds/3812.

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Iron is an essential nutrient for growth of photosynthetic microorganisms such as cyanobacteria and algae. Iron is required for proteins involved in the important processes of carbon and nitrogen assimilation. Low concentrations of iron in cultures or natural waters can lead to iron limitation which affects many aspects of algal metabolism. In natural waters, iron limitation can have effects on the patterns and rates of primary productivity. The cellular content of certain proteins can be affected by media iron concentrations. Methods have been used that assay components of the cell as an indi
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6

Lartigue, Lénaïc. "Synthesis, Characterization, and Theranostic Application of Iron Based Magnetic Nanoparticles." Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20092/document.

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La synthèse de nano-object connait un essor grandissant depuis ces 20 dernières années. Les études fondamentales de système a permis (et permet encore) de trouver de nombreux domaines d'application aux nanotechnologies, que ces soit en catalyse, en électronique, dans le domaine biomédical...La thèse se déroule autour de deux axes de recherches: la synthèse et la description des propriétés magnétique de nanoparticules de fer stabilisé par des liquides ioniques, et la synthèse, l'étude magnétique, et leur évaluation en tant qu'agent de contraste et médiateur d'hyperthermie de nanoparticules de d
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7

Chapman, Michael Wallace. "Insoluble oxide product formation and its effect on coke dissolution in liquid iron." School of Mechanical, Materials and Mechatronic Engineering - Faculty of Engineering, 2009. http://ro.uow.edu.au/theses/3039.

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A significant body of work exists around coke dissolution into liquid iron, however there are key aspects of this important reaction that are not well described. This study was focused on gaining the answers to the questions “How does the coke mineral matter behave during coke dissolution?” and “Can the effects of sulphur and oxide layer formation on the dissolution rate be separated and quantified?”. Issues that must be addressed if the understanding of the kinetics of this reaction is to be advanced and coke's use in the blast furnace further optimised.To this end, a detailed investigation w
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8

McPhee, William A. G. "Liquid pool formation and the influence of iron on the sintering of Al-cu alloys /." St. Lucia, Qld, 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16473.pdf.

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9

Antonsson, Tomas. "On the interaction between liquid/ solid during sintering and solidification." Doctoral thesis, KTH, Casting of Metals, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3464.

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10

MEINERO, MARTINA. "Transport properties at the boundaries of Fermi liquid: iron-based and high-Tc superconductors." Doctoral thesis, Università degli studi di Genova, 2019. http://hdl.handle.net/11567/941936.

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11

Palumbo, Enzo A. "The study of a magnesium wire feeding technique for the desulphurization of molten iron and liquid steel /." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65333.

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12

Liang, Yu [Verfasser]. "Ultrafast Dynamics of Metalloporphyrins, DNA and Iron-Lanthanide Clusters in the Liquid Phase / Yu Liang." Karlsruhe : KIT Scientific Publishing, 2013. http://www.ksp.kit.edu.

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13

Wiencke, Jan-Christian. "Analysis of the electrochemical processes during the production of liquid iron by Molten Oxide Electrolysis." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0329.

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L'électrolyse en milieu oxydes fondus (MOE) peut être envisagée comme une nouvelle technologie de l’industrie sidérurgique pour la production de fer liquide sans émission de CO2. Dans ce concept, l'électrolyse est utilisée pour produire de l’oxygène gazeux et du fer liquide à des températures supérieures à 1810 K. Dans cette étude sont présentées les principales réactions électrochimiques lors de l’électrolyse en milieu fondu (MgO-Al2O3-SiO2). Une quantité importante de fer liquide a été produite lors d'électrolyses conduites pendant plusieurs heures. L'analyse MEB-EDS du dépôt a révélé un all
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14

McCarthy, Fiona Materials Science &amp Engineering Faculty of Science UNSW. "Interfacial phenomena and dissolution of carbon from chars into liquid iron during pulverised coal injection in a blast furnace." Awarded by:University of New South Wales. School of Materials Science and Engineering, 2005. http://handle.unsw.edu.au/1959.4/20797.

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As carbon dissolution rates have been determined for a few chars only, a systematic and comprehensive study was undertaken in this project on the dissolution behaviour of carbon from non-graphitic materials into liquid iron. In addition to measuring the kinetics of carbon dissolution from a number of coal chars into liquid iron as a function of parent coal and coal ash composition, the influence of chemical reactions between solute/solid carbon and ash oxides was also investigated. These studies were supplemented with investigations on one metallurgical coke for the sake of comparison. The wet
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15

Aluru, Sreenivasa Charan Rajeev Gale W. F. "Microstructure - mechanical property relationships in transient liquid phase bonded nickel-based superalloys and iron-based ODS alloys." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Spring/doctoral/ALURU_SREENIVASA_32.pdf.

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16

Posner, Esther [Verfasser], and David [Akademischer Betreuer] Rubie. "Mass transport and structural properties of liquid iron alloys at high pressure / Esther Posner ; Betreuer: David Rubie." Bayreuth : Universität Bayreuth, 2017. http://d-nb.info/1135260621/34.

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17

FRONZO, A. DI. "BIOMASS TO LIQUID PROCESS: NEW KIND OF COBALT AND IRON BASED CATALYSTS FOR THE FISCHER-TROPSCH SYNTHESIS." Doctoral thesis, Università degli Studi di Milano, 2014. http://hdl.handle.net/2434/229549.

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Nowadays it is imperative to develop economical and energy-efficient processes for the sustainable production of fuels and chemicals alternative to the ones deriving from petroleum. Climate change and air quality are major environmental concerns because they directly affect the way we live and breathe. In order to meet the present and future threats generated by emissions to the atmosphere, environmental agencies around the world have issued more stringent regulations. One of them is the control of residual sulfur in diesel fuel and emission standards for particulates from diesel vehicles. All
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18

Lebeau, Timothy Charles. "Brake drum production by centrifugal casting." Birmingham, Ala. : University of Alabama at Birmingham, 2008. https://www.mhsl.uab.edu/dt/2009r/lebeau.pdf.

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19

Wang, Huifeng [Verfasser]. "Surface science approach to catalyst preparation : Palladium deposition onto iron oxide films from the liquid phase / Huifeng Wang." Berlin : Freie Universität Berlin, 2012. http://d-nb.info/1029955042/34.

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20

Wang, Hui-Feng [Verfasser]. "Surface science approach to catalyst preparation : Palladium deposition onto iron oxide films from the liquid phase / Huifeng Wang." Berlin : Freie Universität Berlin, 2012. http://nbn-resolving.de/urn:nbn:de:kobv:188-fudissthesis000000039466-3.

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21

Rhamdhani, Muhammad Akbar Brooks Geoffrey. "Reaction kinetics and dynamic interfacial phenomena in liquid metal-slag systems." *McMaster only, 2005.

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22

Min, Zhenhua. "Catalytic steam reforming of biomass tar using iron catalysts." Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/184.

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Biomass has become an increasingly important renewable source of energy forenhanced energy security and reduced CO[subscript]2 emissions. Gasification is at the core of many biomass utilisation technologies for such purposes as the generation of electricity and the production of hydrogen, liquid fuels and chemicals. However, gasification faces a number of technical challenges to become a commercially feasible renewable energy technology. The most important one is the presence of tar in the gasification product gas. The ultimate purpose of this thesis was to investigate the catalytic reforming
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23

Wang, Yu. "Mechanical properties and microstructure of laser sintered and starch consolidated iron-based powders." Doctoral thesis, Karlstad : Faculty of Technology and Science, Materials Engineering, Karlstads universitet, 2008. http://www.diva-portal.org/kau/abstract.xsql?dbid=1593.

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24

Rubasinghege, Gayan Randika S. "Chemical and photochemical reactions on mineral oxide surfaces in gaseous and liquid phases: environmental implications of fate, transport and climatic impacts of mineral dust aerosol." Diss., University of Iowa, 2011. https://ir.uiowa.edu/etd/1173.

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Mineral dust aerosols emitted from the Earth crust during various natural and anthropogenic processes continuously alter the chemical balance of the atmosphere via heterogeneous processes and thus, impact on the global climate. Understanding of heterogeneous chemistry and photochemistry on mineral dust has become vital to accurately predict the effect of mineral dust loading on the Earth's atmosphere. Here, laboratory measurements are coupled with model studies to understand heterogeneous chemistry and photochemistry in the atmosphere with the specific focus on reactions on mineral oxide surfa
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25

Simelane, Lusanda Susan. "Effect of a multiple micronutrient enriched maize-based liquid meal supplement on iron status of grade 3 and 4 learners attending Sunnyside primary school, Pretoria." Diss., University of Pretoria, 2015. http://hdl.handle.net/2263/46108.

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Background: About one half of school-age children in developing countries are estimated to be affected by iron deficiency. Failure to treat micronutrient deficiencies can negatively affect health and economic development. Objective: To determine the effect of multiple micronutrient maize-based liquid meal supplement on the iron status and the nutritional status of primary school children. Design: A randomized double-blind placebo controlled trial was conducted. Setting and subjects: The study took place at Sunnyside Primary School in Sunnyside, Pretoria, in the urban area of Tshwane (Gauten
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26

Orsine, Noeber Maciel. "Definição de tecnologias para desaguamento de ultrafinos ricos de minério de ferro : uma aplicação na Vale Carajás - Pará - Brasil." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/140518.

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O minério de ferro produzido no complexo de Carajás traz consigo características mineralógicas que conferem um elevadíssimo teor de Fe em todas as suas frações granulométricas. Dessa forma, ao final da cadeia produtiva, tanto os produtos comerciais mais grosseiros quanto os finos contem cerca de 62% de Fe contido na sua composição. Importante destacar que em Carajás as fases no processamento desse minério são apenas para cominuição e classificação por tamanho. Não existem etapas de concentração e os produtos são diferenciados por suas respectivas curvas granulométricas: o “granulado” - mais gr
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27

Ward, Nicholas Rhys. "The rate-limiting mechanism for the heterogeneous burning of iron in normal gravity and reduced gravity." Queensland University of Technology, 2007. http://eprints.qut.edu.au/16673/.

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This thesis presents a research project in the field of oxygen system fire safety relating to the heterogeneous burning of iron in normal gravity and reduced gravity. Fires involving metallic components in oxygen systems often occur, with devastating and costly results, motivating continued research to improve the safety of these devices through a better understanding of the burning phenomena. Metallic materials typically burn in the liquid phase, referred to as heterogeneous burning. A review of the literature indicates that there is a need to improve the overall understanding of heterogeneou
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28

Ward, Nicholas Rhys. "The rate-limiting mechanism for the heterogeneous burning of iron in normal gravity and reduced gravity." Thesis, Queensland University of Technology, 2007. https://eprints.qut.edu.au/16673/1/Nicholas_Ward_Thesis.pdf.

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This thesis presents a research project in the field of oxygen system fire safety relating to the heterogeneous burning of iron in normal gravity and reduced gravity. Fires involving metallic components in oxygen systems often occur, with devastating and costly results, motivating continued research to improve the safety of these devices through a better understanding of the burning phenomena. Metallic materials typically burn in the liquid phase, referred to as heterogeneous burning. A review of the literature indicates that there is a need to improve the overall understanding of heterogeneou
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29

Chen, Chih-Yao. "A study on positive electrode materials for sodium secondary batteries utilizing ionic liquids as electrolytes." Kyoto University, 2014. http://hdl.handle.net/2433/192207.

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30

Roberts, Melissa Delane. "Assessment of arsenate bioavailability in iron-rich environments: development of a high-pressure liquid chromatography method of quanitification for arsenate sorbed by Fe3+-substituted chelating resins in arsenic-bearing ferrihydrite suspensions." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2450.

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Given that the mobility, bioavailability, and toxicity of arsenate in natural systems is often controlled by the strong binding capacity of iron oxyhydroxides, the objective of this study was to document the interactions of Dowex M4195 Fe3+-substituted chelating resins (a potential fieldbased tool for the quantification of potential arsenate bioavailability) and arsenic-bearing ferrihydrite (AFH) as a function of suspension pH, suspension concentration, and background electrolyte concentration. In 0.5 g AFH/L (0.001 M NaNO3) suspensions, arsenate sorption to the resins was proportional to the
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31

Chen, Shu. "FePt magnetic nanoparticles : syntheses, functionalisation and characterisation for biomedical applications." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/2151.

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Iron platinum (FePt) has attracted growing interest because of its high Curie temperature, magneto-crystalline anisotropy and chemical stability. Nanoparticles (NPs) made of this alloy are promising candidates for a wide range of biomedical applications including magnetic separation, magnetic targeted drug delivery, hyperthermia for cancer therapy and also as magnetic resonance imaging (MRI) contrast agents. This thesis presents the synthesis, functionalization and characterization of FePt NPs along with a toxicity study and an investigation into their application as MRI contrast agents. Regar
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32

Hrabovský, Jan. "Biodegradabilní kostní implantáty na bázi železa." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442443.

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This work deals with a current topic, which are biodegradable bone implants. These implants seem to be a suitable candidate for temporary fixations, with their gradual decomposition. An important parameter is not only the mechanical properties so that the material can withstand the load, but above all the corrosion properties and the degradation process. This work introduces the physiology of bone, trace elements and also describes current trends in the field of implants. The last part is a theoretical introduction to cross-stage processes. The practical part is focused on the preparation of i
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33

Buckley, Ragan. "The purine world: experimental investigations into the prebiotic synthesis of purine nucleobases and intercalation of homopurine DNA duplexes." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/48971.

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Formamide is a solvent of great interest to prebiotic chemists because it is liquid over a wide range, it is less volatile than either water or HCN, and it possesses a versatile reactivity. When formamide is heated in the presence of minerals or inorganic catalysts, a variety of products including purine nucleobases are generated. Irradiation of formamide reaction solutions with ultraviolet light increases the yield and diversity of products, and eliminates the need for a mineral catalyst. We have also performed formamide reactions in the presence of pyrite, a mineral which is likely to have b
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34

Farias, Francisco Edson Mesquita. "ProduÃÃo de Hidrocarbonetos atravÃs da SÃntese de Fischer-Tropsch utilizando Catalisadores de Fe/K." Universidade Federal do CearÃ, 2007. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1273.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>A reaÃÃo de sÃntese de Fischer-Tropsch tem merecido grande atenÃÃo pelo seu interesse tecnolÃgico e cientÃfico. Este interesse està associado a conversÃo do gÃs natural em produtos lÃquidos de alta qualidade (gasolina e diesel) e elevado valor agregado. No presente trabalho à descrito a metodologia empregada na sÃntese e caracterizaÃÃo de catalisadores de ferro usados na sÃntese de Fischer-Tropsch, com Ãnfase nos catalisadores suportados em sÃlica e catalisadores industriais (utilizados na sÃntese de amÃnia) promovidos com potÃssio
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35

Silva, Jorge Ayrton da. "Analise termica na solidificação de ferros fundidos cinzentos hipoeuteticos." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264734.

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Orientador: Amauri Garcia<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-08T17:48:12Z (GMT). No. of bitstreams: 1 Silva_JorgeAyrtonda_M.pdf: 5941604 bytes, checksum: 9ec8b76ce4cbb57c06994f1a8307f767 (MD5) Previous issue date: 2007<br>A análise térmica é amplamente utilizada como método de controle de processos metalúrgicos e na investigação da composição química de ferros fundidos na prática de fundição. Um meio confiável de avaliação da composição de ferros fundidos é disponibilizado pela técnica do Carb
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36

Almeida, Sheila Kênia de. "Detecção de bactérias redutoras de sulfato em efluente e sedimento de mina de urânio." CNEN - Centro de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte, 2005. http://www.bdtd.cdtn.br//tde_busca/arquivo.php?codArquivo=44.

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Um dos graves problemas ambientais oriundos da indústria de mineração é a drenagem ácida de mina que ocorre quando a pirita e outros minerais sulfetados são oxidados devido à presença de oxigênio e água, produzindo ácido sulfúrico que solubiliza metais presentes no solo/rocha. Em uma planta das Indústrias Nucleares do Brasil INB, na Unidade de Tratamento de Minérios (UTM) este problema tem se pronunciado de forma preocupante levando a dissolução de espécies radioativas e metálicas presentes. O tratamento da água ácida usando bactérias redutoras de sulfato, proporciona decréscimo da acidez que
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37

Pinkert, Katja. "Mesoporöse Kohlenstoffmaterialien und Nanokomposite für die Anwendung in Superkondensatoren." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-154422.

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Die effiziente Speicherung von elektrischer Energie im elektrochemischen System des Superkondensators wird realisiert durch die Ausrichtung von Elektrolytionen im elektrischen Feld polarisierter, poröser Kohlenstoffelektroden. Der Energieinhalt und die Leistungscharakteristika der elektrostatischen Zwischenspeicherung von Energie bei Lade- und Entladezeiten von wenigen Sekunden bis zu einigen Minuten wird entscheidend durch die Eigenschaften der zur Ladungsspeicherung genutzten Grenzfläche zwischen dem Elektrodenmaterial und dem Elektrolyten bestimmt. Für die Optimierung des Energieinhaltes un
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Leclerc, Olivier. "Etude analytique de l'action des dithiocarbonates sur la pyrite : application a la flottation." Paris 6, 1987. http://www.theses.fr/1987PA066474.

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Nguyen, Nhung Phuong. "Axial Ligand Mutant: H229A." Digital Archive @ GSU, 2008. http://digitalarchive.gsu.edu/honors_theses/1.

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Many pathogenic bacteria use their iron acquisition mechanisms to live inside hosts. Streptococcus pyogenes is a pathogenic bacterium that uses streptococcal iron acquisition ABC transporter to obtain heme. SiaA (HtsA, spy1795), a lipoprotein located on the cell surface, serves as a heme binding protein. To understand the iron-uptake mechanism, histidine 229, one of the two proposed axial ligands in SiaA, was mutated to alanine. SiaA H229A was expressed in E. coli, lysed by French Press, and purified by fast protein liquid chromatography (FPLC). SDS-PAGE indicated that pure protein was isolat
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40

Komora, Mojmír. "Závislost povrchové struktury Fe2O3(012) na prostředí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382255.

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Táto diplomová práca sa zaoberá štúdiom alfa-Fe2O3(012) vystaveného vodnému prostrediu. Súčasný stav poznania ohľadom oxidov železa s pozornosťou vkladanou do popisu alfa-Fe2O3 a jeho (012) povrchu je stručne zhrnutá. Experimentálná časť tejto práce začína s popisom unikátného zariadenia na depozíciu kvapalnej vody na povrchy monokryštalických vzoriek compatibilného s podmienkami ultra vysokého vákuua. Jednotlivé konštrukčné časti a detaily sú diskutované. Navrhnutý systém bol testovaný na vzorkách striebornej fólie a monokryštálu Fe3O4 s povrchovom v rovine [100]. Chemické zloženie a morfológ
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41

Semeniuk, Konstantin. "Correlated low temperature states of YFe2Ge2 and pressure metallised NiS2." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274346.

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While the free electron model can often be surprisingly successful in describing properties of solids, there are plenty of materials in which interactions between electrons are too significant to be neglected. These strongly correlated systems sometimes exhibit rather unexpected, unusual and useful phenomena, understanding of which is one of the aims of condensed matter physics. Heat capacity measurements of paramagnetic YFe$_{2}$Ge$_{2}$ give a Sommerfeld coefficient of about 100 mJ mol$^{−1}$ K$^{−2}$, which is about an order of magnitude higher than the value predicted by band structure cal
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42

Achour, Mickaël. "Mécanisme de corrosion du fer par UF₆ liquide à 80°C." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS064.

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Le combustible nucléaire utilisé dans les réacteurs actuels doit répondre à une spécification de composition en ²³⁵U différente de celle de l’uranium naturel. Il est alors nécessaire de procéder à un enrichissement en part fissile avant de fabriquer le combustible utilisé en réacteur. Cet enrichissement est réalisé par centrifugation en phase gaz en utilisant l’uranium sous forme d’hexafluorure d’uranium UF₆. Ce composé clé est fabriqué par l’usine COMHUREX à partir de UF₄, et doit répondre à des exigences de pureté, et sa manipulation, à des exigences de sécurité. Cette molécule est très réac
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43

Grosselin, Nadège. "Mise au point d'une technique voltampérométrique pour la caractérisation de particules individuelles conductrices de quelques dizaines de microns : application à l'étude de l'adsorption des ions argent et mercure ainsi que du thymol sur la pyrite." Nancy 1, 1998. http://www.theses.fr/1998NAN10142.

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Au cours de ce travail, une nouvelle technique ultramicroélectrochimique pour la caractérisation des grains individuels conducteurs de quelques dizaines de microns à été mise au point. Elle permet, en particulier, la détection d'espèces solubles formées à l'électrode sans devoir imposer des vitesses de balayage extrémement élevées comme c'est le cas avec les ultramicroélectrodes conventionnelles (10 MV/S suffisent). Les études sans ajout d'électrolyte support sont aussi possibles. La comparaison des voltampérogrammes de AG#2SE avec ceux obtenus par les méthodes classiques a mis en évidence qu'
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44

PIATTI, ERIK. "Electrochemical gating for superconductivity engineering in materials towards the 2D limit." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2669688.

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In this thesis work we explored the capability of electrochemical gating to reliably control the ground state of several chosen materials, with a specific focus on the engineering of the superconducting state. We also experimented with different electrolyte compositions in order to best match the electrochemical requirements of the various materials under study (e.g., chemical stability). In the presentation of the results, we will move from the thicker, bulk-like materials down to the truly two-dimensional properties of thin exfoliated single crystals. Chapter 1 presents a general analysis
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45

Darcheville, Marie. "Synthesis of iron oxide nanoparticles and development of magnetic coatings by fluid processing." Thesis, université Paris-Saclay, 2021. http://www.theses.fr/2021UPASP005.

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Ce projet porte sur la réalisation de nouveaux matériaux aux propriétés magnétiques parfaitement contrôlées pour des applications électromagnétiques de types antennes RFID, transmission de puissance sans fil, absorbants radars… Le principe repose sur l’élaboration d’une structure organisée en motifs ou domaines magnétiques définie par des caractéristiques géométriques (taille des motifs, épaisseur, distance entre motifs). La réponse magnétique en perméabilité de tels matériaux est liée aux contributions des domaines et des parois formés, donnant naissance à un matériau dit « multi-bandes » au
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46

Elias, Elede Martins. "Ácido fólico e ferro em alimentos." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/322510.

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Orientador: Helena Teixeira Godoy<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos<br>Made available in DSpace on 2018-08-16T14:08:37Z (GMT). No. of bitstreams: 1 Elias_EledeMartins_D.pdf: 34567537 bytes, checksum: a43c23fe63f955db89437e120fcc7705 (MD5) Previous issue date: 2010<br>Doutorado<br>Nutrição Experimental e Aplicada à Tecnologia de Alimentos<br>Doutor em Alimentos e Nutrição
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Pierron, Olivier. "Interactions eau-fer-argilite : rôle des paramètres liquide/roche, fer/argilite, température sur la nature des phases minérales." Thesis, Nancy 1, 2011. http://www.theses.fr/2011NAN10146/document.

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Les interactions entre le fer métal et l'argilite du Callovo-Oxfordien choisie comme roche hôte pour le stockage des déchets radioactifs, a été étudiée expérimentalement. Le rôle des paramètres clés des transformations (rapports fer/argile, et liquide/roche) ont été étudiés à 90°C, et afin d'accélérer la cinétique des réactions à 150°C et 300°C. Les interstratifiés illite-smectite et les illites sont dissous et remplacés par de nouvelles phases argileuses. Les analyses au MET ont permis de déterminer des Fe-serpentines (phases à 7 Å, groupe de la berthiérine) à 90°C, des phases gonflantes de t
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Heyd, Marie. "Les représentations de la mort dans la création artistique actuelle : histoire, contextualisation, comparaisons." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAC002.

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Alors que les individus dans la société contemporaine sont unis non par une propriété mais par un devoir et par une dette, par un manque, par une limite prenant la forme d’une charge pour celui qui en est affecté, la postmodernité rend à la mort et à l’absence toute sa densité. À travers la répétition, entre jubilation et désespérance, les artistes figurent la temporalité de l’épreuve par une écriture qui travaille l’instant. Ils racontent ces évènements infimes qui sont les plus fragiles, les plus précaires, ayant pourtant une forte efficacité. Il s’agira ici d’étudier les nouvelles postures
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Desplanques, Elsa. "L'usage des textiles dans les pratiques funéraires : le cas des incinération en urne métallique en Europe au Ier millénaire av. J.-C." Thesis, Sorbonne université, 2020. http://www.theses.fr/2020SORUL134.

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L’incinération en urne métallique est une pratique funéraire aristocratique mise en œuvre entre le XIVᵉ et le IIIᵉ siècle av. J.-C. dans certains groupes de population européens. Les urnes employées appartiennent au service utilisé lors du symposion et du banquet. Un grand nombre d’entre elles présente des fragments de textiles, sur les parois intérieures ou extérieures, qui signalent l’usage très répandu de ce matériau. La confrontation des occurrences archéologiques et des sources littéraires, iconographiques et anthropologiques prouve l'importance des tissus au sein des pratiques funéraires
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Rabin, Ségolène. "Etude des mécanismes de distribution des isotopes du fer et du silicium entre les minéraux et les liquides silicatés lors de la différentiation magmatique." Thesis, Toulouse 3, 2021. http://www.theses.fr/2021TOU30206.

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Les compositions isotopiques du fer et du silicium au sein des différents réservoirs géologiques de haute température montrent des variations isotopiques significatives. Cependant, les mécanismes à l'origine de ces fractionnements ne sont pas clairement identifiés. La connaissance de ces mécanismes et des coefficients de fractionnement à l'équilibre est essentielle à l'interprétation des mesures faites sur les roches magmatiques naturelles. Cette étude multidimensionnelle est basée sur le calcul théorique des propriétés isotopiques du fer et du silicium dans les minéraux et les liquides silica
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