Academic literature on the topic '[669.017'
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Journal articles on the topic "[669.017"
Rancière, Jacques. "La démocratie est-elle à venir ?" Les Temps Modernes 669-670, no. 3 (2012): 157. http://dx.doi.org/10.3917/ltm.669.0157.
Full textHeidenreich, Felix. "Comment dire « nous » ?" Les Temps Modernes 669-670, no. 3 (2012): 174. http://dx.doi.org/10.3917/ltm.669.0174.
Full textBensussan, Gérard. "La bête est sans pourquoi." Les Temps Modernes 669-670, no. 3 (2012): 217. http://dx.doi.org/10.3917/ltm.669.0217.
Full textDerrida, Jacques. "La déconstruction et l'autre." Les Temps Modernes 669-670, no. 3 (2012): 7. http://dx.doi.org/10.3917/ltm.669.0007.
Full textLaroche, Hadrien. "Court traité de la décision en deux pages." Les Temps Modernes 669-670, no. 3 (2012): 67. http://dx.doi.org/10.3917/ltm.669.0067.
Full textHerzog, Annabel. "Monolinguisme et optimisme : Derrida, Candide et la culture." Les Temps Modernes 669-670, no. 3 (2012): 106. http://dx.doi.org/10.3917/ltm.669.0106.
Full textRonell, Avital, and Anne Wilhelmi. "L'Impossible Monsieur Bébé, cette déconstruction incessante..." Les Temps Modernes 669-670, no. 3 (2012): 120. http://dx.doi.org/10.3917/ltm.669.0120.
Full textRaffoul, François. "Chez lui chez l'autre." Les Temps Modernes 669-670, no. 3 (2012): 133. http://dx.doi.org/10.3917/ltm.669.0133.
Full textCaputo, John D., and Corine Laidet. "Dieu, peut-être." Les Temps Modernes 669-670, no. 3 (2012): 274. http://dx.doi.org/10.3917/ltm.669.0274.
Full textGrondin, Jean. "Le dialogue toujours différé de Derrida et Gadamer." Les Temps Modernes 669-670, no. 3 (2012): 357. http://dx.doi.org/10.3917/ltm.669.0357.
Full textDissertations / Theses on the topic "[669.017"
Мисливченко, Олександр Миколайович. "Особливості структуроутворення та властивості високоентропійних сплавів системи Cr-Al-Fe-Co-Ni-Cu-Mn-V." Thesis, НТУУ "КПІ", 2016. https://ela.kpi.ua/handle/123456789/15354.
Full textDissertation is devoted to the solution of scientific and technical problem on finding of the new multicomponent alloys, having dipped properties. The features of the structure and properties of high-entropy alloys of Cr-Al-Fe-Co- Ni-Cu-Mn-V. The effect of additional doping on their phase composition, microstructure and physical and mechanical properties. Developed six component alloy CrMnFeCoNi2Cu with high deformability. The influence of strain on alloy phase composition, texture, microstructure, physical and mechanical properties and high thermal stability shown in these figures. The conditions of formation of -phase multicomponent alloys. Based on these conditions, the system of alloys containing -phase studied their phase composition, microstructure, physical and mechanical properties and wear resistance.
Диссертация посвящена решению научно-технической задачи по разработке высокоэнтропийных сплавов с улучшенными свойствами. Сплавы получены аргонно-дуговой плавкой и исследованы рентгеноструктурным анализом, растровой электронной микроскопией с локальным рентгеноспектральным анализом, оптической микроскопией, энергодисперсионным рентгенофлуоресцентным анализом, микроиндентированием. Были проведены испытания на износостойкость согласно ГОСТ 23.208-79. В работе впервые систематически исследовано и определено влияние содержания элементов на сплавы системы Cr-Al-Fe-Co-Ni-Cu. Исследованы фазовый состав, микроструктура, физико-механические свойства и распределение элементов между структурными составляющими. Все сплавы, данной системы, характеризуются высокой твердостью, которая не присущая ни одному из исходных компонентов. Показано, что во всем исследованном концентрационном интервале изменения содержания элементов, вследствие высокой энтропии смешения, образуются только фазы на основе неупорядоченных твердых растворов замещения с ОЦК- и ГЦК-структурами, а также твердый раствор на основе фазы упорядоченной по типу В2. Показано, что в данной системе тип кристаллической решётки твердого раствора определяется средней электронной концентрацией исходных компонентов. Элементы, повышающие среднюю электронную концентрацию (Cu, Ni, Co), способствуют образованию твердого раствора на основе фазы с ГЦК-структурой, понижающие (Al, Cr) – твердого раствора на основе фазы с ОЦК-структурой. Элементы, не влияющие на среднюю электронную концентрацию (Fe), к его однофазному состоянию не приводят. Разработан сплав CrMnFeCoNi2Cu способен деформироваться холодной прокаткой на большие степени деформации без появления трещин или надрывов. Деформация осуществлялась путем последовательной прокатки на станах ДУО-500, ДУО-300, и КВАРТО-100, при комнатной температуре. Показано, что при деформации возрастает его микротвердость, а модуль Юнга остается постоянным после деформации на 70 %. Фазовый состав сплава в литом состоянии состоит из двух твердых растворов на основе фаз с ГЦК-структурами. По мере увеличения степени деформации количество твердого раствора на основе фазы с ГЦК1- структурой уменьшается. Холодная прокатка разработанного сплава приводит к изменению текстуры литья в текстуру прокатки, которая подобна к текстуре прокатки ГЦК-металлов и сплавов. Проведенные отжиги показали высокую термическую стабильность фазового состава, структуры и физико-механических свойств. Так, микротвердость и модуль Юнга сплава деформированного на 98 %, снизились до показателей в литом состоянии только после двухчасового отжига при Т= 1473 К, что составляет (0,97 Тплавл). Отжиг данного сплава в литом и деформированном на 80 % состоянии, при температуре 1073 К и выше, способствует гомогенизации и образованию одного твердого раствора на основе фазы с ГЦК-структурой вместо двух. Отжиг свыше 1273 К, сплава деформированного на 98 %, приводит к выделению по границам зерен ГЦК1 фазовой составляющей. Изменение микротвердости от среднего размера зерен подчиняется соотношению Холла-Петча. Определены условия формирования многокомпонентной -фазы типа (FeCr) в системе V-Сr-Mn-Fe-Co-Ni. Получены сплавы данной системы, исследованы их фазовый состав, микроструктура и физико-механические свойства. Определена износостойкость сплавов VСrMnFeCoNi2, VСrMnFeCoNi1,5, VСrMnFeCoNi при трении об нежестко закрепленные абразивные частицы. Показано, что износостойкость сплава VСrMnFeCoNi близка к промышленному наплавочному материалу Т-590.
Romero, Jose Ramon Rus. "Clay supported extractants for hydrometallurgical applications." Thesis, University of Hertfordshire, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394138.
Full textDadbakhsh, Sasan. "Mechanical engineering : the selective laser melting of metals and in-situ aluminium matrix composites." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3840.
Full textTurkington, Jennifer Rachel. "Investigation into the modes of action of extractants for base metal cations and metalate anions." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/9567.
Full textBalva, Maxime. "Récupération électrochimique en milieu liquide ionique de nanoparticules de platine contenues dans les électrodes de PEMFC." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0375/document.
Full textThe platinum nanoparticles used as catalyst in Proton Exchange Membrane Fuel Cells (PEMFCs) represent around the half of the total price of the cell and is one of the limitations for their large scale commercialization. The treatment of spent PEMFC through the recovery of platinum catalyst is a major concern for their development. Usual recovery routes for platinum-containing catalysts are pyro-hydrometallurgical processes that generate pollutant emissions (CO2, NO2). An electrochemical recovery route by coupling electrochemical leaching and electrodeposition in ionic liquids (ILs) is proposed here, more environmentally friendly, performed in "soft" temperature conditions and without any gases emission. Studies of several electrolytes lead us to select BMIMTFSI + BMIMCl melts (bis(trifluorométhylsulfonyl) imidure + 1-butyl-3-méthylimidazolium chloride), due to the complexing ability of chloride against platinum and the good electrochemical stability of the RMIM+ cation. TFSI-, a weakly coordinate anion, allows us to modulate the complexing ability of the electrolyte, which is a key parameter affecting the nature and the electrochemical stability of the Pt complex formed after leaching. The optimal conditions of the leaching and electrodeposition steps have been determined during this work and successfully applied to PEMFC’s electrode. The selected electrolyte, which is weakly hygroscopic, allows the Pt recovery under ambient atmosphere
Chour, Zeinab. "Valorisation de terres rares à partir de plantes hyperaccumulatrices." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0142/document.
Full textDue to the risk of primary resource supply of rare earths and the environmental impacts generated by mining areas, the concept of agromining seems to be a very promising solution. It allows the extraction of heavy metals from polluted soils or industrial wastelands, by an environmentally friendly method, thanks to the cultivation of hyperaccumulating plants. Once the culture is completed, hydrometallurgical processes are developed in order to extract from plants the metals having a significant economic value. The present work aims to develop hydrometallurgical processes for the extraction of rare earths from a hyperaccumulator plant called Dicranopteris dichotoma. This fern is known for its high ability to accumulate rare earths, especially light ones, in its aerial part. Different extraction and separation ways of rare earths from other elements have been studied. At first, leaching of dry biomass was implemented. The leaching yields according to the nature of extracting solutions could thus be compared. For this approach, precipitation is then performed, followed by calcination step to obtain rare earth oxides. In a second approach, the leaching of dry biomass was intensified by an ion exchange process during which, the rare earths are fixed on the resin. After percolating solutions on the resin in order to eliminate impurities, an elution step leads to obtain a concentrated solution of rare earths. Finally, a third extraction process is carried out from the ashes of D. dichotoma, after a combustion step. This approach is based on an alkaline leaching of the ash allowing the elimination of soluble impurities in this medium. The residue is then dissolved, followed by rare earths selective precipitation. These three approaches studied, are actually complementary and the combination of certain steps can be promising, especially to eliminate some impurities. The study of these processes and their combination deserves to be pursued in order to improve the extraction yields and the purity of final product. It will then develop a pilot scale and industrial process
Hoummady, Emerence. "Étude multi-échelle de l’agglomération pour la lixiviation en tas de minerais uranifères." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0271/document.
Full textHeap leaching allows processing low grade ores. Basically, this industrial mining process consists in percolating a leaching solution slowly down through an ore heap of 6 to 9 meters high to extract the metals of interest. However, fine particles and clays are often the cause of clogging within heaps, leading to a decrease of leaching efficiency. To solve this problem, copper, nickel and uranium industry uses agglomeration of the ore particles. This process allows adjusting the particle size distribution by gathering fine particles. However uranium-ore agglomeration and the impact of the agglomerates structure on heap leaching remains poorly understood. The current thesis allowed characterizing structural and petrophysical properties of agglomerates and its evolution during leaching, studying the influence of agglomeration conditions on agglomerates structures and finally upscaling there results at the heap scale, using meter scale columns. Clogging phenomena were especially due to the mechanical degradation of agglomerates, causing a decrease of both heap porosity and permeability
Feynerol, Vincent. "Traitement de minerais de fer par lixiviation alcaline suivi de leur électrolyse en milieu alcalin." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0163.
Full textAn innovative ironmaking process by alkaline electrolysis of suspended iron oxides is being developed at ArcelorMittal Global R&D Maizières-lès-Metz. Were it to achieve industrial maturity, this process would permit a significant reduction of steelmaking CO2 emissions. Indeed, the use of carbon as a reducing agent in blast furnace would be replaced by electricity. Although this process enables iron production from commercial hematite (Fe2O3) at current density of 1000 A.m-2 with faradaic efficiency higher than 80%, these performances are systematically lower when using iron ore instead. The main impurities in these ores are aluminium and silicon oxides and hydroxides, these compounds are soluble in concentrated sodium hydroxide solutions. These compounds could be the source of the decrease in reactivity observed when feeding the process with iron ores. To raise the electrolysis performance with iron ores, alkaline leaching treatments were conducted on a defined iron ore. Reactivity of iron ores before and after treatment was compared by chronoamperometry. Although the elimination of aluminous compounds resulted in the ore gaining a faradaic yield increase to a value of 80%, compared with 65% before treatment, its current density remained twice as low as the one of hematite for a same applied voltage. Furthermore, complementary experiments of aluminate and silicate ions addition during pure hematite electrolysis did not have any deleterious effect on its electrolysis. Based on all the experiments undertaken in this PhD, it seems unlikely that siliceous and aluminous impurities hold an important effect on iron ore reactivity in alkaline electrolysis. The process is nonetheless very sensitive to iron ores granulometry. On this subject, strong agglomeration phenomena were witnessed when measuring iron ores granulometry but did not occur with pure iron oxides. Therefore, it would seem that other phenomena may be the main cause of reactivity loss, these phenomena may well be linked to secondary granulometry of iron ores in concentrated alkaline media. In parallel, an advanced thermodynamic analysis was carried out to describe the best theoretical conditions for pressure, temperature and NaOH concentration to realize hematite electrolysis. Gangue compounds solubility was represented with Pitzer equations, and new parameters were calculated for Na-SiO3-Al(OH)4 interactions. This thermodynamic study enabled the design and pre-sizing of a treatment step for iron ores by alkaline leaching
Guilpain, Mathilde. "Procédés innovants pour la valorisation du nickel directement extrait de plantes hyperaccumulatrices." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0179/document.
Full textAgromining is a chain allowing the recovery of metals dispersed in soils or other matrices, using hyperaccumulator plants (HA). The first step is to grow these plants to achieve high yields of metals and the second to produce metal compounds of interest from the plant biomass. Agromining has mainly been developed to value nickel (Ni). Until now, biomass was burnt to concentrate the metal and remove organic matter. The challenge of this research is to design processes for Ni recovery by direct extraction from biomass, without burning the plant. It will allow a better understanding of the processes involved in the extraction of Ni from dry biomass using a solvent and the determination of the the speciation in the solution. Then, appropriate separation operations will be implemented to isolate the Ni in an interesting form for subsequent applications.Water leaching experiments, run at 20 ° C with two contrasted HAs, demonstrated that up to 80% of Ni could be transferred from the plant tissues to the solution. Ni is accompanied by major ions and organic compounds. The analysis of these compounds and the modeling of the chemical equilibria in solution showed that more than 95% of Ni was complexed by organic ligands, carboxylic acids (Ni carriers in the plant) as well as stronger complexing agents. From these results, separation processes were selected: selective precipitation and adsorption on complexing resin. They made it possible to recover respectively 75 and more than 95% of the nickel in sulphide or carboxylic compound forms. In contrast, purification with decanoate did not isolate the Ni.Thus, this work has made it possible to better understand the extraction of Ni directly from plants, the speciation of Ni in a multicomponent solution in the presence of organic ligands, and to valorize nickel by ways previously unexplored with this type of material
Djoudi, Neïla. "Conception, développement et mise au point d'un procédé hydrométallurgique de récupération du cobalt (II) issu de mines secondaires par précipitation." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0010.
Full textCobalt is one of the fifty strategic metals considered essential for the industry and which are at the heart of global economic and geopolitical issues. This is why, research into the recovery of this critical metal, from industrial or urban waste, are particularly important for the years to come. The subject of the thesis is the development of a hydrometallurgical process to recover cobalt from a Li-ion battery leachate by precipitation. The first part of the thesis focused on the precipitating agent choice, which must meet a certain number of criteria in order to recover cobalt efficiently. Based on these criteria, a comparative study of the different precipitating agents was carried out. It was based on the literature as well as on the simulations of thermodynamic equilibria carried out in Visual Minteq 3.0. The results showed that it was possible to recover 99.8% of cobalt, in the hydroxide form. Based on these results, experiments were conducted to validate the hypotheses put forward and to compare the results obtained with the simulations performed. Experimentally, several parameters were studied in order to determine the optimal conditions for cobalt recovery, in terms of yield, filterability and selectivity. Certain parameters such as supersaturation can influence the product obtained typology (particle size, agglomerate size, polymorphism...). The selected polymorph should allow to obtain the highest yields and the lowest filtration times. Subsequently, the research focused on the study of complex synthetic media containing cobalt and manganese, thus getting closer to the real conditions of Li-ion battery leachates, and appearing on the proposed process scheme. Experimental results were compared to simulations previously carried out. Finally, based on the results obtained in discontinuous mode, experiments were carried out in continuous mode. It was possible to determine the optimal parameters for cobalt recovery and to extrapolate them to the pilot scale in a fluidized bed reactor, allowing the process to be considered on a larger scale